CA1220100A - Method and apparatus for applying an absorbent material on to a substrate - Google Patents
Method and apparatus for applying an absorbent material on to a substrateInfo
- Publication number
- CA1220100A CA1220100A CA000420142A CA420142A CA1220100A CA 1220100 A CA1220100 A CA 1220100A CA 000420142 A CA000420142 A CA 000420142A CA 420142 A CA420142 A CA 420142A CA 1220100 A CA1220100 A CA 1220100A
- Authority
- CA
- Canada
- Prior art keywords
- absorber
- particles
- fact
- substrate
- pursuant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000000758 substrate Substances 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000000463 material Substances 0.000 title abstract description 16
- 230000002745 absorbent Effects 0.000 title description 3
- 239000002250 absorbent Substances 0.000 title description 3
- 239000002245 particle Substances 0.000 claims abstract description 56
- 239000006096 absorbing agent Substances 0.000 claims abstract description 54
- 230000008569 process Effects 0.000 claims abstract description 15
- 239000002313 adhesive film Substances 0.000 claims abstract description 11
- 239000000853 adhesive Substances 0.000 claims description 25
- 230000001070 adhesive effect Effects 0.000 claims description 24
- 238000003860 storage Methods 0.000 claims description 21
- 239000000155 melt Substances 0.000 claims description 12
- 230000033001 locomotion Effects 0.000 claims description 7
- 230000001680 brushing effect Effects 0.000 claims description 2
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 238000010521 absorption reaction Methods 0.000 description 9
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 229920002678 cellulose Polymers 0.000 description 4
- 239000001913 cellulose Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 229920000742 Cotton Polymers 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 210000001124 body fluid Anatomy 0.000 description 2
- 239000010839 body fluid Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000001266 bandaging Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/15577—Apparatus or processes for manufacturing
- A61F13/15617—Making absorbent pads from fibres or pulverulent material with or without treatment of the fibres
- A61F13/15642—Making absorbent pads from fibres or pulverulent material with or without treatment of the fibres by depositing continuous layers or pads of fibrous material on single sheets or webs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C19/00—Apparatus specially adapted for applying particulate materials to surfaces
- B05C19/06—Storage, supply or control of the application of particulate material; Recovery of excess particulate material
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F2013/15008—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterized by the use
- A61F2013/15048—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterized by the use for protection against contamination, or protection in using body disinfecting wipes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/15577—Apparatus or processes for manufacturing
- A61F2013/15821—Apparatus or processes for manufacturing characterized by the apparatus for manufacturing
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F2013/530131—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium being made in fibre but being not pulp
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F2013/530481—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/539—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium characterised by the connection of the absorbent layers with each other or with the outer layers
- A61F2013/5395—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium characterised by the connection of the absorbent layers with each other or with the outer layers with thermoplastic agent, i.e. softened by heat
Abstract
Abstract of the Disclosure The invention describes a process and a device, whereby exactly defined and predetermined areas of a substrate are coated with a thin melt adhesive film; these areas are then coated with particles of a high-active absorber and excess absorber particles are then pneumatically or mechanically removed, so that the demand for absorber material can be small. As to required devices only an applicator head 52, a measuring head 60 or 85 and an arrangement 70, 75, 76 for the removal of excess absorber material is required, so that the presently existing machines for the production of articles of hygiene can easily be integrated with the device pursuant to this invention and can function in accordance with this new process.
Description
Articles of hygiene of special interest in this regard comprise diapers, sanitary napkins, aids in cases ofincontlnence and sick-hed (waterproof) sheets. Such articles of hygiene shall retain eliminated body fluids for a longer time period.
The quality of such a sanitary article is therefore determined to a great extent by its absorption capacity. Until now such an absorption ability was achieved by using absorbent cellulose wadding, fluff cellulose or absorbent cotton. In reference to a given volume the absorption by these materials is not very great, so that a better absorption can be achieved substantially only by using a big amount of such sanitary articles. This is not too important for babies and bed patients, but is considered inconvenlent in all other cases.
In order to increase the absorption capacity of articles of hygiene and/or to decrease their volume, it is known to place highly active absorptive particles. Such absorbers can be water-insoluble, water-resisting absorptive organic polymers, which are known as such and have the shape of fine grained solid matter. The embedding of absorber particles in absorbent cotton and similar substances has the disadvantage, as known by experience, that the particles cluster in one or several places of the article and can perform their absorptive ability only in certain parts of the article.
In other areas is the absorption quickly exhausted, so that further elimination of body fluids can pass through the sanitary article.
In order to avoid these problems the patent DE-OS 30 40 768 has provided, that the absorber is embedded in a coating or that a backing is coated with this material.
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The quality of such a sanitary article is therefore determined to a great extent by its absorption capacity. Until now such an absorption ability was achieved by using absorbent cellulose wadding, fluff cellulose or absorbent cotton. In reference to a given volume the absorption by these materials is not very great, so that a better absorption can be achieved substantially only by using a big amount of such sanitary articles. This is not too important for babies and bed patients, but is considered inconvenlent in all other cases.
In order to increase the absorption capacity of articles of hygiene and/or to decrease their volume, it is known to place highly active absorptive particles. Such absorbers can be water-insoluble, water-resisting absorptive organic polymers, which are known as such and have the shape of fine grained solid matter. The embedding of absorber particles in absorbent cotton and similar substances has the disadvantage, as known by experience, that the particles cluster in one or several places of the article and can perform their absorptive ability only in certain parts of the article.
In other areas is the absorption quickly exhausted, so that further elimination of body fluids can pass through the sanitary article.
In order to avoid these problems the patent DE-OS 30 40 768 has provided, that the absorber is embedded in a coating or that a backing is coated with this material.
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- 2 -mab/ ~
The coating or backing is then applied to a diaper, tampon, etc.
Articles of hygiene, which are manufactured in ~his manner, can have the desired small volume and also achieve the desirable high absorption capacity. However, the cost of this process is great.
It is, therefore, the task of this invention, to propose a process and a device of the above-mentioned type, which permits a substantial saving in the production, especially of articles of hygiene compared with the previously-mentioned method, without affecting the efficiency of the absorptive ability and the volume.
The solution was found in a process, whereby a thin melt adhesive film is applied on one or several predetermined places of at least one area of the substrate, that the particles of the absorber are then transmitted on the area and, finally, that any excess particles, which did not get in contact with the melt adhesive, are again removed from the area.
The device used to enable this task of applying a high-active absorber on a substrate, expecially an article of hygiene, the components of which are in any case brought from a storage position to a working position and there combined with each other, is arranged in such a manner, that between the storage position and the working position above the track (path) of at least one of the components means for the coating of a uniform thin melt-adhesive film are provided at least on one predetermined area of the surface of the component, that in the moving direction of the component the release of absorber particles on means for the surface are then arranged, followed by means for the removal of excess particles from the surface.
The coating or backing is then applied to a diaper, tampon, etc.
Articles of hygiene, which are manufactured in ~his manner, can have the desired small volume and also achieve the desirable high absorption capacity. However, the cost of this process is great.
It is, therefore, the task of this invention, to propose a process and a device of the above-mentioned type, which permits a substantial saving in the production, especially of articles of hygiene compared with the previously-mentioned method, without affecting the efficiency of the absorptive ability and the volume.
The solution was found in a process, whereby a thin melt adhesive film is applied on one or several predetermined places of at least one area of the substrate, that the particles of the absorber are then transmitted on the area and, finally, that any excess particles, which did not get in contact with the melt adhesive, are again removed from the area.
The device used to enable this task of applying a high-active absorber on a substrate, expecially an article of hygiene, the components of which are in any case brought from a storage position to a working position and there combined with each other, is arranged in such a manner, that between the storage position and the working position above the track (path) of at least one of the components means for the coating of a uniform thin melt-adhesive film are provided at least on one predetermined area of the surface of the component, that in the moving direction of the component the release of absorber particles on means for the surface are then arranged, followed by means for the removal of excess particles from the surface.
- 3 -mab/ y ,~
~2~
The desired result is accomplished with the mentioned means in two ways. First of all, the use of absorptive particles can be reduced. Due to the known absorption capacity of the absorber particles and based on statistical figures concerning the average required absorption capacity for a predetermined time period can the required amount of absorptive particles be ascertained. It is further known, that a diaper or a sanitary napkin has to absorb more fluids in certain areas than in others.
Therefore, the application of absorptive particles can be limited to danger zones of the article of hygiene. While at the state of (patent) art - if adhesive was used for the fixation of absorptive particles - the entire area of the article was coated, which did not permit a fairly accurate localization of absorbent areas, the application of melt adhesives, using the known methods of application, enables a very accurate and limited application of extremely thin melt-adhesive films, which even possess a certain permeability and do not hamper the flexibility of the sanitary articles. This results in a saving of absorptive material, with a cost reduction, without affecting the quality of the end product, rather enhancing it. The desired result is further accomplished in that manner, that on the one hand the expenditure for the industrial instrumentation, that is the investment, is rather small and that the time of production is greatly reduced compared with the (patent) art. This is especially true if a pressure sensitive melt adhesive is applied, since it does not require any consideration of the time between the application of the film and the coating of the absorber, so that the placing of the components of the device can be effected in the framework of the existing devices for the production of sanitary articles.
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Further characteristics and advantages of this invention can be found in the following description of several preferred examples of realization. In these drawings are shown:
Fig. 1 is a schematic presentation of a side view of the input area of a device for the production of three-layered tampons with a first example of realization of a device for the application of a high-active absorber on one of the layers;
Fig. 2 is a schematic representation of a modified example pursuant to this invention,where only one layer of a multiple-layered sanitary article is shown before its completion;
Fig. 3 is a schematic representation pursuant to Fig. 2 of a further modified example of realization pursuant to the present invention;
Fig. 4 is a modified example of realization of this invention pursuant to Fig. 2 with a dipping ~splashing) for the transfer of an absorptive particle to a layer of an article of hygiene;
Fig. 5 is a schematic representation of the control of the device pursuant to this invention;
Fig. 6 is a top view in schematic representation of a layer of a sanitary article before its completion in the area of the device for the application of the absorber;
Fig. 7 and 8 each a schematic representation of a top view of a layer of the article of hygiene with coated areas at different locations of the surface.
In these drawings the components of the invention and - if available - the known devices for the production of sanitary articles are schematically shown, since this method permits a clearer picture of this invention. For an expert in the field of the production of articles of hygiene or in the area of the mab/ ~
- ~2~
production of the machines for this purpose, the construction is known. For these experts it is only necessary to know, that holding devices have to be provided for and at what approximate locations for the input of components of the device pursuant to this invention.
The invention is described in connection with articles of hygiene, as described above. But it can also be applled for other purposes, as for example for muslin bandages for bandaging of injured parts, also for filter inserts or similar items in the technical areas. The use of the term "articles of hygiene"
shall not be interpreted as a limitation. Articles of hygiene consist usually of at least three layers. On the side away from the body surface there is a lamination sheet provided, which is impermeable for body liquids. Then follows a layer, usually of several parts, of cellulose, fluff cellulose or absorbent cotton. This core stratum absorbs usually the entire liquid.
This core stratum is covered with a fleece or woven fabric, which is pleasant to the body.
Generally, it is left to the decision of the manu-facturer of the article of hygiene, on what layer or layers,respectively on what area or areas of the several layers the high-active absorptive particles are applied. Only the outside surfaces of the top layer and of the laundry protective foil are excluded.
In Fig. 1 the input area of a machine is schemati-cally shown, which serves the production of a three-layered tampon.
In this machine three storage rollers 10, 20, 30 are provided, from which the individual layers are drawn-off in the direction of the arrow and are lead together throu~h two pressure rollers i mab/ ~1 .1L~2~
40, 41. Durlng the motion process after these pressure rollers the individual layers are combined with each other. Then the tampon is cut off in the regulated length.
On storage roller 10 the laundry protective sheet 11 is located. On storage roller 20 is the core stratum 21 of the tampon and on storage roller 30 is a fleece positioned, which forms the cover layer 31. The distance between the storage rollers 10, 20, 30 and the pressure rollers 40, 41 can be as usual for machines of this type, because the device, numbered 50, for the application of the absorptive material in the direction of the movement need not have a greater length than about 50 cm and can, therefore, easily be integrated in existing machines. The device 50 is provided with at least one applicator head 52 for the melt adhesive, which is positioned above the core stratum 21, as seen in moving direction. This applicator head, is connected through conduit 54 to a storage tank (not shown) for said melt adhesive device and to a control mechanism, also not shown. The applicator head is provided with an air jet (56), which is arranged directly above the stratum area 21.
In moving direction follows a measuring head 60 the applicator head 52. It contains an outlet for the absorber directly above the core statum 21 (not shown in the drawing), which is fed from a storage tank (not shown) through a conduit 62 to the measuring head 60.
After it, in moving direction, is a suction head 70 positioned above the core stratum 21. It contains also a suction port directly above the core stratum and has a width, which is greater than the largest area to be absorbed~ From suction head 70 leads a suction pipe 72 at first to the suction m~h/ \~\~
side of a blower (not shown) and from its pressure side to the storage tank for the absorber.
Below the core stratum 21 is a container 80 arranged.
It is connected through conduit 82 with the storage tank for the absorber, whereby in this conduit 82 a blower can also be provided for draining out the container. Further, a vibrator 84 can be arranged on the container 80, which facilitates the exhausting of absorber particles. The method of operation of -the device is as follows:
The three layers 11, 21, 30 are continuously drawn from the delivery spools 10, 20, 30 in the direction of the arrow through impression rollers 40, 41. Depending on the length of the bandages or diapers to be manufactured and on the length of the areas to be provided with the absorber, the control device (not shown) transmits an impulse to the applicator head 52, which thereupon opens the air jet for a predetermined time and releases melt-adhesive in the form of a thin and sharply limited film on core stratum 21. Such area 53, coated with adhesive, is shown for example in Fig. 6. The area 53 moves in the direction of the arrow from applicator head 52 to measuring head 60. As soon as it arrives there, the measuring head releases absorptive material on core stratum 21. The release of the material is terminated, after the rear edge of area 53 has passed the measuring head 60. The time periods for the opening of the measuring head 60 and a feed pump for the absorptive material, belonging thereto, are controlled by the control device. This happens in the known manner and does not require any further explanation. It has to be observed however, that the predetermined maximum periods for the application of the melt adhesive and the applying of `? - 8 -mab/ ~
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the absorber must not be exceeded, when using the usual adhesive melt applicator, since the latter provides a viscous surface only for a certain time. When using pressure-sensitive melt adhesive applicator the cooling period need not be taken into account.
After the area 53, provided with adhesive film, has passed the measuriny head 60, this area as well as adjacent areas of the surface of core stratum 21 are covered with particles of the absorber, as shown in Fig. 6 with reference sign 53'.
The further conveyance of the core stratum 21 carries now the area 53' below the suction head 70. All excess particles of the absorber, which do not adhere to area 53 are drawn off, so that after the passing of suction head 70 a sharply defined area 53" exists, which carries a predetermined quantity of absorptive material finely distributed. The core stratum 21 can now pass through the impression rollers 40, 41 for further processing in the machine.
The material, which has drawn off by suction head 70 goes through suction line 72 to a suction and pumping feed device 64, which contains the storage tank (not shown) for the absorber. Conduit 82, which originates in container 80 is connected with feed device 64.
The example of realization pursuant to Fig. 2 is quite similar to that of Fig. 1. However, the container 80' is in the moving direction shorter than shown before. Further, the representation portrays only the course of stratum area 21 with the areas 53, 53', 53" above it. Further, in this ~xample of realization is a blower 74, which is not depending on feed device 64, and both conduits 72, 82 are brought together in front of the aspirating mouth of blower 74.
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~ 11 examples of realization show, that the layer to be coated (21) is not supported, at least not in the area of the applicator head ~2; that means, it is not carried on a table or conveyor belt. This facilitates the application of an expecially uniform film. Care should be taken, that the substrate is carried in a very precise manner in horizontal direction in the area of the applicator head.
Fig. 3 shows an arrangement, in which the device 50 pursuant to this invention is a self-contained construction unit. This is achieved by arranging a cover 90 on top core stratum 21 for the container 80, which is located below said core stratum 21, so that the container and the cover form a mutual housing.
This housing is arranged in the machine (not shown) between the impression rollers 40, 41 and two pressure rollers 38, 39, which are positioned ahead of them. The core stratum 21 goes from the impression rollers 38, 39 through an intake slot into the housing and leaves it on the way to impression rollers 40, 41 through an outlet slot 92.
Within the housing, seen in the moving direction, is at first an applicator head 52, then a measuring head 60, and finally a suction head 70 in addition to the lines, belonging to it. These lines (conduits) lead in the already described manner to a storage tank for a melt adhesive and a control device, which can be combined with the storage tank and/or the feed device 64 in one construction unit.
In Fig. 3 areas 53, 53' and 53" are shown. In this example of realization the use of brushes 75, 75' is to be noted~ They are arranged within the housing and in the direction of movement behind suction head 70 in such a manner, that they touch there the core stratum 21 and that they sweep any particles mab/ ~ ~
~2Cl~
of the absorber, which were not drawn off by the suction head, into the container 80. The height of the cover 90 above the core stratum 21 is determined by the size of the heads used.
This explains, why the boundary line of cover 90 in Fig. 3 is partially shown in a broken line.
The example of realization of the invention pursuant to Fig. 4 distinguishes itself from the above-described examples by not using a measuring head. The arriving core stratum 21 passes first below the applicator head 52, which produces on the surface of the core stratum the already described areas 53.
After passing the applicator head 52 the core stratum 21 is rerouted by a guide roller in downward direction and reaches container 85. This container is filled with absorber particles to a predetermined height. Immerged in this absorber particles is another guide roller 43, in order to reroute the core stratum 21, which was at first inclined downward, in upward direction.
Thus the core stratum, which was coated in the area 53 with adhesive film, is lead through the absorber. The areas 53 will be covered with absorber particles. After leaving the splashing, core stratum 21 passes suction head 70, then leaves container 85 and is rerouted by means of another guide roller 44 in its original direction and enters through additional impression rollers (not shown) into the machine (also not shown) for further processing. A
splashing with absorber particles 86 in the container 85 for the application of absorptive particles on the areas 53 has the advantage of mechanical simplicity. However, both surfaces of core stratum 21 are exposed to the absorber, so that the core stratum has to be thoroughly cleaned after its emergence. For this purpose brushes 76, 76' are provided, which each sweep a surface of the core stratum. The use of this example of realization is especially advantageous, when the component of the substrate, respectively the artlcle of hygiene, has rather smooth surfaces, through which absorptive particles can not pene-trate.
The absorptive particles, which were swept away by brushes 76, 76' fall back into the absorber storage 86 in container 85. The particles, which were drawn off by suction head 70 reach a feed line 73 through a blower (not shown) and return to container 85. Feed line 73 serves also for the delivery of fresh absorptive material into container 85, when the absorber level within the container reaches a predetermined minimum.
Fig. 5 shows an example for the control of applicator head 52 and of measuring head 60. In this case applicator head 52 is connected through a melt adhesive line 54' to a storage tank (not shown) for the melt adhesive. From a pressure medium source (not shown) leads a pressure medium line 55 into the area of device 50. It is kept under continuous pressure. A branch 55' of the pressure medium line is guided to the first solenoid valve 94. A second branch 55" of the pressure medium line is connected with a second solenoid valve 95.
At the pressure medium outlet of the solenoid valve 94 is line 54" of applicator head 52 attached and the switching magnet of solenoid valve 94 is activated by a control device (not shown) through control line 57. In a manner known to the expert the release of melt adhesive through air jet 56 of the applicator head is activated by a pressure medium actuated valve, located in the applicator head. At the instance, when the applicator head shall start to coat area 53, that is to apply the proper adhesive film on core stratum 21, the solenoid valve 94 is opened mab/ \~ ~
by the control device through line 57, so that the pressure of the pressure medium line 55 acts upon the valve in applicator head 52 through branch 55' and line 5~" and can open said valve.
Similarly solenoid valve 94 and also the valve in the applicator head are closed, when the control device signals an end of area 53 through control line 57.
The pressure medium outlet of the second solenoid valve 95 is connected with a control cylinder 96, of which the piston rod 97 averts an angle lever 98. The free arm of angle lever 98 is connected through rod 100 to slide 61, which closes or releases the outlet slot 66 in measuring head 60. Measuring heads of this type are known, so that a detailed description seems to be unnecessary. However, it is noted, that a storage room 63 is located in measuring head 60, which is supplied from time to time with absorptlve particles 86 through a feed line.
A spring 99 attached to angle lever 98 tightens both the piston rod 97 of the control cylinder 96 and the slide 61 of the measuring head 60 in idle position, in which the outlet slot 66 of the measuring head is closed.
As soon as an area 53, which carried an adhesive of core stratum 21 enters into the area of slot 66 of the measuring head 60, the control device (not shown) gives an activation signal through control line 58 to solenoid valve 95. The latter opens, so that the pressure of the pressure medium line 55 reaches the control cylinder 96, piston rod 97 moves upward and, consequently, slide 61 moves in iis open position, in which absorptive particles 86 can emerge through slot 66. The activation signal, which came through control line 58, for solenoid valve 95 will be terminated by the control device, as soon as the entire area 53 has passed slot 66 and is covered with absorptive particles. The thus mab/ ~ ~
developed areas 53' go together with core stratum 21 to suction head 70 (not shown in Fig. 5), which does not need a special control, but runs usually through continuously. In connection with Fig. 6 was already one of the forms of the areas 53 described.
Fig. 7 and 8 show, that simultaneously or staggered several areas 53.1 to 53.4, respectively 53.5 to 53.9 can be coated each for an article of hygiene. The places, where the machine-produced product can later be separated, to form the individual articles of hygiene, is indicated in Fig. 6 to 8 by dotted lines 15.
In Fig. 7 are shown four exact square adhesive areas 53.1 to 53.4, produced by applicator head 52. The required construction of the applicator head is known to the expert, so that a detailed description is unnecessary. However, it should be noted, that in this case four air jets 56 are arranged in the applicator head and controlled by the control device.
The areas 53.5 to 53.9 of the example shown in Fig. 8 are in the moving direction offset (against each other) and differ partially in size. The width of the areas is determined by the width of the air jet 56, while their length is set by the control device through control line 57 (Fig. 5), taking the rate of feed of the core stratum 21 into account. In Fig. 8 three applicator heads 52.1. 52.2, 52.3 are shown. They are separately controlled by the control device. In this manner both the sample of the areas 53.5 to 53.9, shown in Fig. 8 and various other samples can be achieved. It is obvious, that each of heads 52.1 to 52.3 has a feed line 54.1 to 54.3 for the supply of melt adhesive and for the control signals. A comparison of Fig. 7 and 8 show further, that the measuring head 60 can have differently sized outlets, which are indicated in the drawings mab/ ~ ~
~z~
by dotted lines. It is obvious for the expert, that the dis-charge from these outlets can be controlled in the case of Fig.
~2~
The desired result is accomplished with the mentioned means in two ways. First of all, the use of absorptive particles can be reduced. Due to the known absorption capacity of the absorber particles and based on statistical figures concerning the average required absorption capacity for a predetermined time period can the required amount of absorptive particles be ascertained. It is further known, that a diaper or a sanitary napkin has to absorb more fluids in certain areas than in others.
Therefore, the application of absorptive particles can be limited to danger zones of the article of hygiene. While at the state of (patent) art - if adhesive was used for the fixation of absorptive particles - the entire area of the article was coated, which did not permit a fairly accurate localization of absorbent areas, the application of melt adhesives, using the known methods of application, enables a very accurate and limited application of extremely thin melt-adhesive films, which even possess a certain permeability and do not hamper the flexibility of the sanitary articles. This results in a saving of absorptive material, with a cost reduction, without affecting the quality of the end product, rather enhancing it. The desired result is further accomplished in that manner, that on the one hand the expenditure for the industrial instrumentation, that is the investment, is rather small and that the time of production is greatly reduced compared with the (patent) art. This is especially true if a pressure sensitive melt adhesive is applied, since it does not require any consideration of the time between the application of the film and the coating of the absorber, so that the placing of the components of the device can be effected in the framework of the existing devices for the production of sanitary articles.
mab/~
~L2~
Further characteristics and advantages of this invention can be found in the following description of several preferred examples of realization. In these drawings are shown:
Fig. 1 is a schematic presentation of a side view of the input area of a device for the production of three-layered tampons with a first example of realization of a device for the application of a high-active absorber on one of the layers;
Fig. 2 is a schematic representation of a modified example pursuant to this invention,where only one layer of a multiple-layered sanitary article is shown before its completion;
Fig. 3 is a schematic representation pursuant to Fig. 2 of a further modified example of realization pursuant to the present invention;
Fig. 4 is a modified example of realization of this invention pursuant to Fig. 2 with a dipping ~splashing) for the transfer of an absorptive particle to a layer of an article of hygiene;
Fig. 5 is a schematic representation of the control of the device pursuant to this invention;
Fig. 6 is a top view in schematic representation of a layer of a sanitary article before its completion in the area of the device for the application of the absorber;
Fig. 7 and 8 each a schematic representation of a top view of a layer of the article of hygiene with coated areas at different locations of the surface.
In these drawings the components of the invention and - if available - the known devices for the production of sanitary articles are schematically shown, since this method permits a clearer picture of this invention. For an expert in the field of the production of articles of hygiene or in the area of the mab/ ~
- ~2~
production of the machines for this purpose, the construction is known. For these experts it is only necessary to know, that holding devices have to be provided for and at what approximate locations for the input of components of the device pursuant to this invention.
The invention is described in connection with articles of hygiene, as described above. But it can also be applled for other purposes, as for example for muslin bandages for bandaging of injured parts, also for filter inserts or similar items in the technical areas. The use of the term "articles of hygiene"
shall not be interpreted as a limitation. Articles of hygiene consist usually of at least three layers. On the side away from the body surface there is a lamination sheet provided, which is impermeable for body liquids. Then follows a layer, usually of several parts, of cellulose, fluff cellulose or absorbent cotton. This core stratum absorbs usually the entire liquid.
This core stratum is covered with a fleece or woven fabric, which is pleasant to the body.
Generally, it is left to the decision of the manu-facturer of the article of hygiene, on what layer or layers,respectively on what area or areas of the several layers the high-active absorptive particles are applied. Only the outside surfaces of the top layer and of the laundry protective foil are excluded.
In Fig. 1 the input area of a machine is schemati-cally shown, which serves the production of a three-layered tampon.
In this machine three storage rollers 10, 20, 30 are provided, from which the individual layers are drawn-off in the direction of the arrow and are lead together throu~h two pressure rollers i mab/ ~1 .1L~2~
40, 41. Durlng the motion process after these pressure rollers the individual layers are combined with each other. Then the tampon is cut off in the regulated length.
On storage roller 10 the laundry protective sheet 11 is located. On storage roller 20 is the core stratum 21 of the tampon and on storage roller 30 is a fleece positioned, which forms the cover layer 31. The distance between the storage rollers 10, 20, 30 and the pressure rollers 40, 41 can be as usual for machines of this type, because the device, numbered 50, for the application of the absorptive material in the direction of the movement need not have a greater length than about 50 cm and can, therefore, easily be integrated in existing machines. The device 50 is provided with at least one applicator head 52 for the melt adhesive, which is positioned above the core stratum 21, as seen in moving direction. This applicator head, is connected through conduit 54 to a storage tank (not shown) for said melt adhesive device and to a control mechanism, also not shown. The applicator head is provided with an air jet (56), which is arranged directly above the stratum area 21.
In moving direction follows a measuring head 60 the applicator head 52. It contains an outlet for the absorber directly above the core statum 21 (not shown in the drawing), which is fed from a storage tank (not shown) through a conduit 62 to the measuring head 60.
After it, in moving direction, is a suction head 70 positioned above the core stratum 21. It contains also a suction port directly above the core stratum and has a width, which is greater than the largest area to be absorbed~ From suction head 70 leads a suction pipe 72 at first to the suction m~h/ \~\~
side of a blower (not shown) and from its pressure side to the storage tank for the absorber.
Below the core stratum 21 is a container 80 arranged.
It is connected through conduit 82 with the storage tank for the absorber, whereby in this conduit 82 a blower can also be provided for draining out the container. Further, a vibrator 84 can be arranged on the container 80, which facilitates the exhausting of absorber particles. The method of operation of -the device is as follows:
The three layers 11, 21, 30 are continuously drawn from the delivery spools 10, 20, 30 in the direction of the arrow through impression rollers 40, 41. Depending on the length of the bandages or diapers to be manufactured and on the length of the areas to be provided with the absorber, the control device (not shown) transmits an impulse to the applicator head 52, which thereupon opens the air jet for a predetermined time and releases melt-adhesive in the form of a thin and sharply limited film on core stratum 21. Such area 53, coated with adhesive, is shown for example in Fig. 6. The area 53 moves in the direction of the arrow from applicator head 52 to measuring head 60. As soon as it arrives there, the measuring head releases absorptive material on core stratum 21. The release of the material is terminated, after the rear edge of area 53 has passed the measuring head 60. The time periods for the opening of the measuring head 60 and a feed pump for the absorptive material, belonging thereto, are controlled by the control device. This happens in the known manner and does not require any further explanation. It has to be observed however, that the predetermined maximum periods for the application of the melt adhesive and the applying of `? - 8 -mab/ ~
Q~
the absorber must not be exceeded, when using the usual adhesive melt applicator, since the latter provides a viscous surface only for a certain time. When using pressure-sensitive melt adhesive applicator the cooling period need not be taken into account.
After the area 53, provided with adhesive film, has passed the measuriny head 60, this area as well as adjacent areas of the surface of core stratum 21 are covered with particles of the absorber, as shown in Fig. 6 with reference sign 53'.
The further conveyance of the core stratum 21 carries now the area 53' below the suction head 70. All excess particles of the absorber, which do not adhere to area 53 are drawn off, so that after the passing of suction head 70 a sharply defined area 53" exists, which carries a predetermined quantity of absorptive material finely distributed. The core stratum 21 can now pass through the impression rollers 40, 41 for further processing in the machine.
The material, which has drawn off by suction head 70 goes through suction line 72 to a suction and pumping feed device 64, which contains the storage tank (not shown) for the absorber. Conduit 82, which originates in container 80 is connected with feed device 64.
The example of realization pursuant to Fig. 2 is quite similar to that of Fig. 1. However, the container 80' is in the moving direction shorter than shown before. Further, the representation portrays only the course of stratum area 21 with the areas 53, 53', 53" above it. Further, in this ~xample of realization is a blower 74, which is not depending on feed device 64, and both conduits 72, 82 are brought together in front of the aspirating mouth of blower 74.
, .
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~ 11 examples of realization show, that the layer to be coated (21) is not supported, at least not in the area of the applicator head ~2; that means, it is not carried on a table or conveyor belt. This facilitates the application of an expecially uniform film. Care should be taken, that the substrate is carried in a very precise manner in horizontal direction in the area of the applicator head.
Fig. 3 shows an arrangement, in which the device 50 pursuant to this invention is a self-contained construction unit. This is achieved by arranging a cover 90 on top core stratum 21 for the container 80, which is located below said core stratum 21, so that the container and the cover form a mutual housing.
This housing is arranged in the machine (not shown) between the impression rollers 40, 41 and two pressure rollers 38, 39, which are positioned ahead of them. The core stratum 21 goes from the impression rollers 38, 39 through an intake slot into the housing and leaves it on the way to impression rollers 40, 41 through an outlet slot 92.
Within the housing, seen in the moving direction, is at first an applicator head 52, then a measuring head 60, and finally a suction head 70 in addition to the lines, belonging to it. These lines (conduits) lead in the already described manner to a storage tank for a melt adhesive and a control device, which can be combined with the storage tank and/or the feed device 64 in one construction unit.
In Fig. 3 areas 53, 53' and 53" are shown. In this example of realization the use of brushes 75, 75' is to be noted~ They are arranged within the housing and in the direction of movement behind suction head 70 in such a manner, that they touch there the core stratum 21 and that they sweep any particles mab/ ~ ~
~2Cl~
of the absorber, which were not drawn off by the suction head, into the container 80. The height of the cover 90 above the core stratum 21 is determined by the size of the heads used.
This explains, why the boundary line of cover 90 in Fig. 3 is partially shown in a broken line.
The example of realization of the invention pursuant to Fig. 4 distinguishes itself from the above-described examples by not using a measuring head. The arriving core stratum 21 passes first below the applicator head 52, which produces on the surface of the core stratum the already described areas 53.
After passing the applicator head 52 the core stratum 21 is rerouted by a guide roller in downward direction and reaches container 85. This container is filled with absorber particles to a predetermined height. Immerged in this absorber particles is another guide roller 43, in order to reroute the core stratum 21, which was at first inclined downward, in upward direction.
Thus the core stratum, which was coated in the area 53 with adhesive film, is lead through the absorber. The areas 53 will be covered with absorber particles. After leaving the splashing, core stratum 21 passes suction head 70, then leaves container 85 and is rerouted by means of another guide roller 44 in its original direction and enters through additional impression rollers (not shown) into the machine (also not shown) for further processing. A
splashing with absorber particles 86 in the container 85 for the application of absorptive particles on the areas 53 has the advantage of mechanical simplicity. However, both surfaces of core stratum 21 are exposed to the absorber, so that the core stratum has to be thoroughly cleaned after its emergence. For this purpose brushes 76, 76' are provided, which each sweep a surface of the core stratum. The use of this example of realization is especially advantageous, when the component of the substrate, respectively the artlcle of hygiene, has rather smooth surfaces, through which absorptive particles can not pene-trate.
The absorptive particles, which were swept away by brushes 76, 76' fall back into the absorber storage 86 in container 85. The particles, which were drawn off by suction head 70 reach a feed line 73 through a blower (not shown) and return to container 85. Feed line 73 serves also for the delivery of fresh absorptive material into container 85, when the absorber level within the container reaches a predetermined minimum.
Fig. 5 shows an example for the control of applicator head 52 and of measuring head 60. In this case applicator head 52 is connected through a melt adhesive line 54' to a storage tank (not shown) for the melt adhesive. From a pressure medium source (not shown) leads a pressure medium line 55 into the area of device 50. It is kept under continuous pressure. A branch 55' of the pressure medium line is guided to the first solenoid valve 94. A second branch 55" of the pressure medium line is connected with a second solenoid valve 95.
At the pressure medium outlet of the solenoid valve 94 is line 54" of applicator head 52 attached and the switching magnet of solenoid valve 94 is activated by a control device (not shown) through control line 57. In a manner known to the expert the release of melt adhesive through air jet 56 of the applicator head is activated by a pressure medium actuated valve, located in the applicator head. At the instance, when the applicator head shall start to coat area 53, that is to apply the proper adhesive film on core stratum 21, the solenoid valve 94 is opened mab/ \~ ~
by the control device through line 57, so that the pressure of the pressure medium line 55 acts upon the valve in applicator head 52 through branch 55' and line 5~" and can open said valve.
Similarly solenoid valve 94 and also the valve in the applicator head are closed, when the control device signals an end of area 53 through control line 57.
The pressure medium outlet of the second solenoid valve 95 is connected with a control cylinder 96, of which the piston rod 97 averts an angle lever 98. The free arm of angle lever 98 is connected through rod 100 to slide 61, which closes or releases the outlet slot 66 in measuring head 60. Measuring heads of this type are known, so that a detailed description seems to be unnecessary. However, it is noted, that a storage room 63 is located in measuring head 60, which is supplied from time to time with absorptlve particles 86 through a feed line.
A spring 99 attached to angle lever 98 tightens both the piston rod 97 of the control cylinder 96 and the slide 61 of the measuring head 60 in idle position, in which the outlet slot 66 of the measuring head is closed.
As soon as an area 53, which carried an adhesive of core stratum 21 enters into the area of slot 66 of the measuring head 60, the control device (not shown) gives an activation signal through control line 58 to solenoid valve 95. The latter opens, so that the pressure of the pressure medium line 55 reaches the control cylinder 96, piston rod 97 moves upward and, consequently, slide 61 moves in iis open position, in which absorptive particles 86 can emerge through slot 66. The activation signal, which came through control line 58, for solenoid valve 95 will be terminated by the control device, as soon as the entire area 53 has passed slot 66 and is covered with absorptive particles. The thus mab/ ~ ~
developed areas 53' go together with core stratum 21 to suction head 70 (not shown in Fig. 5), which does not need a special control, but runs usually through continuously. In connection with Fig. 6 was already one of the forms of the areas 53 described.
Fig. 7 and 8 show, that simultaneously or staggered several areas 53.1 to 53.4, respectively 53.5 to 53.9 can be coated each for an article of hygiene. The places, where the machine-produced product can later be separated, to form the individual articles of hygiene, is indicated in Fig. 6 to 8 by dotted lines 15.
In Fig. 7 are shown four exact square adhesive areas 53.1 to 53.4, produced by applicator head 52. The required construction of the applicator head is known to the expert, so that a detailed description is unnecessary. However, it should be noted, that in this case four air jets 56 are arranged in the applicator head and controlled by the control device.
The areas 53.5 to 53.9 of the example shown in Fig. 8 are in the moving direction offset (against each other) and differ partially in size. The width of the areas is determined by the width of the air jet 56, while their length is set by the control device through control line 57 (Fig. 5), taking the rate of feed of the core stratum 21 into account. In Fig. 8 three applicator heads 52.1. 52.2, 52.3 are shown. They are separately controlled by the control device. In this manner both the sample of the areas 53.5 to 53.9, shown in Fig. 8 and various other samples can be achieved. It is obvious, that each of heads 52.1 to 52.3 has a feed line 54.1 to 54.3 for the supply of melt adhesive and for the control signals. A comparison of Fig. 7 and 8 show further, that the measuring head 60 can have differently sized outlets, which are indicated in the drawings mab/ ~ ~
~z~
by dotted lines. It is obvious for the expert, that the dis-charge from these outlets can be controlled in the case of Fig.
4 by a common slide, which can enable the coating with absorptive particles of areas 53.2' to 53.4'. On the other hand separate slides are required in applicator head 60, when the areas 53.5' to 53.9' shall be adequantly coated with absorptive particles.
Alternatively, the absorber can be released unaimed on the core stratum 21, which would also result from the use of the arrange-ment in Fig. 4.
The suction head 70, which overlaps the width of core stratum 21 draws the excess absorptive material continuously off, so that finally the completed coated areas 53.1" to 53.4"
(Fig. 7), respectively 53.5" to 53.9" (Fig. 8) are formed.
It is to be understood, that not only the always mentioned core stratum 21 of the article of hygiene can be provided with the absorber pursuant to the invention, but that likewise the inner surfaces of the components of the article can be treated, which are located outside. Moreover, a component, arranged in the center, can be provided with absorptive material on both sides. In some cases it will be advantageous to turn the stratum to be coated, in order to apply the adhesive material and the absorber from the top. It is within the scope of the invention, to provide a very wide stratum of the article with absorptive areas and then to sever it in longitudinal direction for the production of smaller bandages, etc. In such cases an adequate number of applicator - or measuring heads can be arranged side by side to achieve the required width or a single applicator -respectively measuring head of adequate width. It i~ also within the scope of the invention, to forego entirely or partially mab/ ~ ~
the drawing-off and/or the brushing away of areas 53', which are coated with absorptive particles and to expose the core stratum, respective other coated layers to a shaking motion, which supports at least the removal of excess absorber particles.
mab. ~ ~
Alternatively, the absorber can be released unaimed on the core stratum 21, which would also result from the use of the arrange-ment in Fig. 4.
The suction head 70, which overlaps the width of core stratum 21 draws the excess absorptive material continuously off, so that finally the completed coated areas 53.1" to 53.4"
(Fig. 7), respectively 53.5" to 53.9" (Fig. 8) are formed.
It is to be understood, that not only the always mentioned core stratum 21 of the article of hygiene can be provided with the absorber pursuant to the invention, but that likewise the inner surfaces of the components of the article can be treated, which are located outside. Moreover, a component, arranged in the center, can be provided with absorptive material on both sides. In some cases it will be advantageous to turn the stratum to be coated, in order to apply the adhesive material and the absorber from the top. It is within the scope of the invention, to provide a very wide stratum of the article with absorptive areas and then to sever it in longitudinal direction for the production of smaller bandages, etc. In such cases an adequate number of applicator - or measuring heads can be arranged side by side to achieve the required width or a single applicator -respectively measuring head of adequate width. It i~ also within the scope of the invention, to forego entirely or partially mab/ ~ ~
the drawing-off and/or the brushing away of areas 53', which are coated with absorptive particles and to expose the core stratum, respective other coated layers to a shaking motion, which supports at least the removal of excess absorber particles.
mab. ~ ~
Claims (20)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A process for the application of a high-active absorber on a substrate, especially an article of hygiene, characterized by the fact that a thin melt-adhesive film is applied on one or several predetermined areas, that particles of the absorber are then applied on the surface and, finally, that the excess particles, which did not make contact with the melt adhesive, are removed from the surface.
2. Process pursuant to claim 1, characterized by the fact that the melt adhesive is a pressure sensitive adhesive.
3. Process pursuant to claim 1, characterized by the fact that the melt adhesive is applied as a uniform, largely laminar and very thin stream on the surface in a width corresponding to the width of each area.
4. Process pursuant to one of the claims 1 to 3, characterized by the fact that the substrate, which contains the surface, is kept suspended at least in the entire area during the application of the melt adhesive.
5. Process pursuant to one of the claims 1 to 3, characterized by the fact that the substrate, which contains the surface, is lead through a container, which is filled with absorber-particles.
6. Process pursuant to one of the claims 1 to 3, characterized by the fact that the substrate which contains the surface, is moved relative to a measuring head for the application of the particles.
7. Process pursuant to one of the claims 1 to 3, characterized by the fact that at least a part of the excess particles of the absorber is removed from the surface by suction.
8. Process pursuant to one of the claims 1 to 3, characterized by the fact that at least a part of the particles of the absorber is removed from the surface by brushing off.
9. Process pursuant to one of the claims 1 to 3, chracterized by the fact that the substrate which contains the surface, is exposed to a shaking movement to remove excess particles.
10. Device for the application of a high-active absorber on a substrate, especially on articles of hygiene, the components of which are brought from a storage position to a working position and are then combined with each other, characterized by the fact that above the track between the storage and working position of at least one of the components, means are arranged for the application of a uniformly thin melt adhesive film on at least a predetermined area of the surface of the component, in the motion direction of the component followed by means for the release of absorber particles on the surface and that means are arranged adjacent and in front of the working position for the removal of excess particles from the surface.
11. Device pursuant to claim 10, characterized by the fact that the means for the application of a uniformly thin melt adhesive film consist of an applicator head with a controlled slotted nozzle, which is arranged directly above the substrate to be coated and is connected through conduits with a storage tank for the melt adhesive and a control device for the control of the application of melt adhesive through the slotted nozzle.
12. Device pursuant to claim 11, characterized by the fact that several applicator heads are arranged side by side in the direction of the width of the substrate.
13. Device pursuant to claim 10, characterized by the fact that the means for the release of absorber particles on the surface consist of a measuring head, which has at least one controllable outlet, associated with the surface of the area of the substrate and which is connected with the control device for the purpose of synchronization with the outlet(s).
14. Device pursuant to claim 13, characterized by the fact that the measuring head possesses in the direction of the width of the substrate several separate outlets, which can be controlled mutually or independently of each other.
15. Device pursuant to claim 13 or 14, characterized by the fact that the outlets of the measuring head can be controlled pneumatically.
16. Device pursuant to one of the claims 10 to 12, chracterized by the fact that the means for the release of absorber particles on the surface consist of a container, which is partially filled with absorber particles, an intake for the substrate as well as an outlet and a guide device below the height of the filling level of the absorber, so that the substrate within the container can be moved into the absorber and then rerouted out of it and that in the motion direction of the substrate the means for the removal of excess absorber particles are arranged before the outlet .
of container.
of container.
17. Device pursuant to one of the claims 10 to 12, characterized by the fact that the means for the removal of excess particles from the surface has at least one suction head, which has an opening in the direction of the areas which are coated with absorber particles, and connected with the suction side of a blower, and that the pressure side of the blower is connected with a storage container for the absorber.
18. Device pursuant to claims 10 to 12, chracterized by the fact that the means for the removal of excess particles from the surface consist of brushes or contain them and that these brushes are adjacent to each surface of the substrate, which is to be relieved of excess particles.
19. Device pursuant to one of the claims 10 to 12, characterized by the fact that below the surface of the substrate, which faces the means for the release of absorber particles, a container for the collection of excess absorber particles is positioned.
20. Device pursuant to one of the claims 10 to 12, characterized by the fact that the means for the applica-tion of the melt adhesive film, for the release of absorber particles and for the removal of excess absorber particles are arranged in a common housing, which is provided with connections for the supply and disposal of the media and for their control.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP82100921.4 | 1982-02-02 | ||
EP82100921A EP0085729B1 (en) | 1982-02-09 | 1982-02-09 | Process and apparatus for coating a substrate with a highly absorbent material, in particular a hygienic article |
Publications (1)
Publication Number | Publication Date |
---|---|
CA1220100A true CA1220100A (en) | 1987-04-07 |
Family
ID=8188864
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA000420142A Expired CA1220100A (en) | 1982-02-09 | 1983-01-25 | Method and apparatus for applying an absorbent material on to a substrate |
Country Status (5)
Country | Link |
---|---|
US (1) | US4675209A (en) |
EP (1) | EP0085729B1 (en) |
JP (1) | JPS58155855A (en) |
CA (1) | CA1220100A (en) |
DE (1) | DE3267217D1 (en) |
Families Citing this family (38)
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US4578068A (en) * | 1983-12-20 | 1986-03-25 | The Procter & Gamble Company | Absorbent laminate structure |
DE3411457A1 (en) * | 1984-03-28 | 1985-11-07 | Vereinigte Papierwerke Schickedanz & Co, 8500 Nürnberg | WOMEN'S TAPE OR PLEASURE |
NZ222302A (en) * | 1986-12-08 | 1989-09-27 | Nordson Corp | Spraying moisture absorbent particles into a layer of forming non woven wadding |
US4927346A (en) * | 1986-12-08 | 1990-05-22 | Nordson Corporation | Apparatus for depositing particulate material into a pad of fibrous material in a forming chamber |
US5017324A (en) * | 1986-12-08 | 1991-05-21 | Nordson Corporation | Method for depositing particulate material into a pad of fibrous material in a forming chamber |
JPH02193665A (en) * | 1989-01-24 | 1990-07-31 | Oji Paper Co Ltd | Method for producing absorber for throw-away diaper |
US5102585A (en) * | 1990-01-09 | 1992-04-07 | Kimberly-Clark Corporation | Method for intermittently depositing particulate material in a substrate |
US5156902A (en) * | 1990-01-09 | 1992-10-20 | Kimberly-Clark Corporation | Method and apparatus for intermittently depositing particulate material in a substrate and article made therewith |
US5028224A (en) * | 1990-01-09 | 1991-07-02 | Kimberly-Clark Corporation | Apparatus for intermittently depositing particulate material in a substrate |
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US4392908A (en) * | 1980-01-25 | 1983-07-12 | Lever Brothers Company | Process for making absorbent articles |
JP3464045B2 (en) * | 1994-06-22 | 2003-11-05 | 株式会社資生堂 | Low alcohol flavor composition |
-
1982
- 1982-02-09 DE DE8282100921T patent/DE3267217D1/en not_active Expired
- 1982-02-09 EP EP82100921A patent/EP0085729B1/en not_active Expired
-
1983
- 1983-01-25 CA CA000420142A patent/CA1220100A/en not_active Expired
- 1983-02-09 JP JP58020524A patent/JPS58155855A/en active Pending
-
1985
- 1985-07-24 US US06/758,347 patent/US4675209A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
EP0085729B1 (en) | 1985-11-06 |
JPS58155855A (en) | 1983-09-16 |
DE3267217D1 (en) | 1985-12-12 |
US4675209A (en) | 1987-06-23 |
EP0085729A1 (en) | 1983-08-17 |
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