WO2016017421A1

WO2016017421A1 - Absorbent article manufacturing method

Info

Publication number: WO2016017421A1
Application number: PCT/JP2015/070170
Authority: WO
Inventors: 友弘渡部; 常男清水
Original assignee: ユニ・チャーム株式会社
Priority date: 2014-07-31
Filing date: 2015-07-14
Publication date: 2016-02-04
Also published as: JP2016032607A; JP5951701B2

Abstract

The purpose of the present invention is to obtain an absorbent article manufacturing method that can reliably and stably perform examination as to whether a second sheet member the texture of which is different from a first sheet member is normally attached to the first sheet member which forms an absorbent article, and that can prevent the manufacture of defective absorbent articles. The present invention comprises the following: an affixing step in which an adhesive is applied between a back-sheet continuous body (10) which is the first sheet member and a target tape (5) which is the second sheet member, and while tension is applied in the length direction of the back-sheet continuous body (10), the target tape (5) is affixed to the back-sheet continuous body (10); and an examination step in which light is transmitted through the back-sheet continuous body (10) to which the target tape (5) has been attached, and the position of the edge portion of the target tape (5) is thereby examined.

Description

Method for manufacturing absorbent article

The present invention relates to a production method for producing various absorbent articles such as sanitary napkins, panty liners, incontinence pads, and disposable diapers.

As an absorbent article, for example, a disposable diaper includes a liquid-permeable top sheet positioned on the user's skin side, a liquid-impermeable back sheet positioned on the clothing side such as underwear, and the top sheet and back sheet. And an absorbent body having a liquid-absorbing property provided between the two.
Among the disposable diapers, there is a so-called tape-type disposable diaper. In such a tape-type disposable diaper, a fastening tape provided on the back side is provided on a target tape provided on the stomach side of the disposable diaper. It can be made to wear to a wearer by connecting.

About the said tape type disposable diaper, it is common that the said target tape is affixed with the adhesive etc. in the position which hits the stomach side at the time of wear in the said back sheet, for example. However, in the manufacturing process, if the target tape is not affixed at the correct position, the fastening tape cannot be connected with the disposable diaper properly worn by the wearer. Moreover, even if it connects a fastening tape as a part of the target tape is drowning more than necessary, it cannot make a wearer wear a disposable diaper firmly. Furthermore, the target tape itself may not be attached to the back sheet.
Therefore, in the disposable diaper manufacturing process, it is necessary to inspect whether the target tape is attached to the back sheet in a normal state.
Such inspection is performed in various modes. For example, as shown in Patent Document 1, it is widely performed to photograph an inspection object with a camera.

On the other hand, in recent years, there is a movement to secure an advantage in the market by the design of disposable diapers. For this reason, as the target tape, a tape having a color similar to that of the back sheet is used or the back sheet can be seen through, and the pattern attached to the back sheet or the target tape is a disposable diaper. Many of them are designed to appear beautifully on the surface.
However, although the texture of the target tape is different from that of the back sheet, the outer shape of the target tape is difficult to see when the color is close to or transparent to the back sheet. It may be difficult to determine whether the target tape is attached to the back sheet in a normal state only by checking with a camera.
Therefore, even if it passes through the said test | inspection, the test | inspection precision does not improve, As a result, the defective product in which the said target tape is not affixed on the said back sheet in the normal state may be manufactured.

Japanese Patent Laid-Open No. 10-38541

The technical problem of the present invention is to ensure whether or not a second sheet member having a texture different from that of the first sheet member is attached to the first sheet member constituting the absorbent article in a normal state. Another object of the present invention is to provide a method for producing an absorbent article that can be stably inspected to prevent the production of defective absorbent articles.

The manufacturing method of the absorbent article of this invention for solving the said subject is as follows.
(1) A second sheet member formed in a predetermined size is attached to a first surface of the sheet surface of the first sheet member formed long in the conveying direction, and the sheet of the first sheet member A manufacturing method for manufacturing an absorbent article by attaching an absorbent body to a second surface that is a surface opposite to the first surface in a surface, and forming the absorbent article in a size of a single absorbent article, An affixing step of adhering the second sheet member having a different texture from the first sheet member at a predetermined position on the first surface of the first sheet member with an adhesive; An inspection step for inspecting whether or not the second sheet member is attached to a normal state on one sheet member, and in the attaching step, the first sheet member and the second sheet Apply adhesive between the parts The second sheet member is attached to the first sheet member while applying a tension in the length direction of the first sheet member, and the second sheet member is attached in the inspection step. The manufacturing method of an absorbent article which permeate | transmits light with respect to the attached 1st sheet member, and confirms the position of the edge part of this 2nd sheet member.

(2) The manufacturing method of the absorbent article according to (1), wherein the first sheet member and the second sheet member have different total light transmittances of the light.
(3) In the affixing step, when applying an adhesive between the first sheet member and the second sheet member, adhesion without applying an adhesive to a part of the periphery of the second sheet member The method for producing an absorbent article according to (1) or (2), wherein the agent-free region is formed.
(4) If it is determined in the inspection step that the second sheet member is not attached to the first sheet member in a normal state, the first sheet member after the inspection step The method for producing an absorbent article according to any one of (1) to (3), wherein the absorbent article formed by a portion where the second sheet member is not attached in a normal state is excluded.

(5) The manufacturing of the absorbent article according to any one of (1) to (4), wherein the first sheet member and / or the second sheet member has a pattern formed on a sheet surface. Method.
(6) In the inspection step, the first sheet member and / or the second sheet member is made to transmit infrared light to a portion where a pattern is formed, and the pattern is erased or thinned (5) The manufacturing method of the absorbent article as described in any one of.

According to the present invention, in the attaching step, an adhesive is applied between the first sheet member and the second sheet member, and tension is applied in the length direction of the first sheet member. Since the second sheet member is attached to the first sheet member, the texture of the first sheet member is stabilized, the position of the edge portion of the second sheet member is easily grasped, and the outer shape It is easy to specify. In addition, the inspection step can grasp the position of the edge portion of the second sheet member by transmitting light to the first sheet member to which the second sheet member is attached. Therefore, the position of the second sheet member with respect to the first sheet member can be easily confirmed.
As a result, it is possible to easily determine whether or not the second sheet member is attached to the first sheet member in a normal state, and reliably and stably prevent defective products from being manufactured. can do.

FIG. 1 is a perspective view schematically showing an example of a disposable diaper manufactured by the method for manufacturing an absorbent article according to the present invention. FIG. 2 is a diagram schematically showing an example of a transfer device used in the attaching step of the method for manufacturing an absorbent article according to the present invention. Drawing 3 is a figure showing typically an example of the inspection device used in the inspection process of the manufacturing method of the absorptive article concerning the present invention.

Hereinafter, the manufacturing method of the absorbent article of this invention is demonstrated based on one Embodiment.
In this embodiment, as an absorbent article, when manufacturing a disposable diaper, in particular, a so-called tape-type disposable diaper that causes the wearer to wear the disposable diaper by connecting the fastening tape to the target tape at the time of wearing. Will be described.

As shown in FIG. 1, the disposable diaper 1 manufactured in the manufacturing method of this embodiment has a length direction, a width direction, and a thickness direction, and is located on the skin surface side of the wearer. A top sheet 2 having permeability, a back sheet 3 located on the side of the wearer's clothing provided on the opposite side of the skin surface of the wearer in the top sheet 2, and an absorbent body 4 having liquid absorption It has.
Further, a target tape 5 having a different texture from the back sheet 3 is attached to the wearer's belly side on the clothing side sheet surface of the back sheet 3, while the back side of the wearer has a

back Fastening tapes

6 and 6 are attached to both ends of the sheet 3 in the width direction so as to be detachably connected to the target tape 5.
In addition, a pair of leak-

proof walls

7 and 7 for preventing leakage of excretory fluid from the crotch portion is attached to the top sheet 2 side of the disposable diaper 1.

The top sheet 2 is formed of a nonwoven fabric, and the back sheet 3 is formed of a waterproof nonwoven fabric or a synthetic resin film, or a composite material in which a nonwoven fabric is laminated on a synthetic resin film. In this embodiment, the back sheet 3 is formed of a composite material in which a nonwoven fabric is laminated on the clothing side of the back sheet 3 in the synthetic resin film.
Further, the absorbent body 4 is formed of a water-absorbing material such as pulp or a water-absorbing polymer, and includes an absorbent core and a non-woven fabric covering sheet that covers the outer peripheral surface of the absorbent core.
The target tape 5 is formed of a nonwoven fabric containing natural fibers such as cotton, recycled fibers such as rayon, synthetic fibers such as polyethylene and polypropylene, and the like. In this embodiment, the target tape 5 is formed of a nonwoven fabric, and a plurality of small hooks formed on the

fastening tapes

6 and 6 are caught on the fibers constituting the nonwoven fabric, so that these target tapes 5 And the

fastening tapes

6 and 6 can be connected to each other.

In the disposable diaper 1 of this embodiment, the target tape 5 is formed in a single substantially rectangular shape extending in the width direction of the disposable diaper 1, and the target tape 5 is a back sheet. 3 is attached to the central part in the width direction on the abdomen side on the clothing side.
In this embodiment, both the target tape 5 and the back sheet 3 are white, and the target tape 5 has a higher total light transmittance than the back sheet 3.
Here, the total light transmittance of the target tape 5 and the back sheet 3 is not particularly limited as long as it can transmit light emitted from the illumination device 32 of the inspection device 30 to be described later, but for example, a wavelength of about 700 to 1000 nm. For infrared, in this embodiment, JIS K
7105 Total light transmittance by measuring method A (measuring device: Nippon Denshoku Industries Co., Ltd. integrating sphere turbidity meter NDH-300A type) is about 60% for the target tape, The synthetic resin film forming the back sheet 3 is about 30%, and the non-woven fabric laminated on the synthetic resin film is about 70%. The target tape 5 and the back sheet 3 substantially have a total light transmittance. They are different from each other.
Furthermore, a pattern 8 printed with an ink mainly composed of pigment is attached to the sheet surface of the portion of the back sheet 3 where the target tape 5 is attached. You can see through.

And the manufacturing method of the disposable diaper in this embodiment is a long backsheet continuous body which is a first sheet member, in which the backsheet 3 is continuously connected in the length direction and formed long in the transport direction. 10, a pasting step of pasting a target tape 5 formed in a predetermined size, which is a second sheet member, and after the pasting step, the target tape 5 is a disposable diaper 1 in the backsheet continuous body 10. And an inspection process for inspecting whether or not the portion corresponding to the back sheet 3 corresponding to the number of sheets is attached in a normal state.
In addition, after the inspection step, the step of laminating the absorbent body 4 at intervals that allow the single disposable diaper 1 to be formed on the sheet surface corresponding to the top sheet side of the backsheet 3 in the backsheet continuous body 10; A process of laminating a continuous long sheet of the top sheet, in which the top sheet 2 is connected in the length direction and formed long in the conveying direction, on the back sheet continuous body 10 in which the layers 4 are stacked so as to cover the absorbent body 4. Including.
Further, a cutting step of cutting the laminated body in which the backsheet continuous body 10, the absorbent body 4, and the topsheet continuous body are laminated into a single disposable diaper 1 mode, and after the cutting step, in the inspection step And a step of eliminating the disposable diaper 1 determined that the target tape 5 is not attached to the backsheet continuous body 10 in a normal state.
In addition, the process of attaching the

fastening tapes

6 and 6 detachably connected to the target tape 5 to the back sheet 3 and the process of attaching the leak-

proof walls

7 and 7 are performed.

In the pasting step, a predetermined position on the single backsheet 3 with respect to the backsheet continuous body 10, that is, a clothing side surface on the sheet surface of the single backsheet 3 (hereinafter referred to as a first surface). The target tape 5 is affixed to a position corresponding to the ventral side of the disposable diaper 1. At this time, the adhesion of the target tape 5 to the backsheet continuous body 10 is performed by applying an adhesive between the backsheet continuous body 10 and the target tape 5 and applying a tension in the length direction of the backsheet continuous body 10. Do it while acting.

The pasting process in this embodiment is performed using, for example, a transfer device 20 as shown in FIG.
The transfer device 20 shown in FIG. 2 rotates a long target tape continuous body 15 that is transported in the transport direction MD and in which a plurality of target tapes 5 are continuously connected in one direction, in the circumferential direction. A suction drum 21 is provided that conveys the target tape continuous body 15 while holding it on the outer peripheral surface by suction. In addition, the target tape continuous body 15 held on the outer peripheral surface of the suction drum 21 is cut to a predetermined length by a cutting blade 22a disposed on the outer peripheral surface by rotating, and a single target tape 5 is obtained. A cutter roll 22 is provided.
Further, the outer peripheral surface is in contact with the second surface 10b side, which is the surface opposite to the first surface 10a in the backsheet continuous body 10, and the direction in which the backsheet continuous body 10 is conveyed is turned. A nip roll 23 is provided to bring the first surface 10 a side of the continuous body 10 into contact with the outer peripheral surface of the suction drum 21.
Further, the transfer device 20 is provided with tension rolls 24 and 25 for applying tension to the backsheet continuous body 10 on the upstream side and the downstream side in the transport direction MD from the nip roll 23, respectively. The tension in the length direction of the backsheet continuous body 10 can be generated in the backsheet continuous body 10 by the difference in the rotation speed of the tension roll.

Then, after the target tape continuous body 15 sucked and held by the suction drum 21 rotating in the circumferential direction is cut into a single target tape 5 by the cutter roll 22, it is held on the outer peripheral surface of the suction drum 21. The target tape 5 is sequentially transferred to the first surface 10 a of the backsheet continuous body 10 being conveyed in contact with the outer peripheral surface of the suction drum 21 on the outer peripheral surface of the nip roll 23. At this time, the position where the target tape 5 is transferred is basically a portion corresponding to the ventral side of the backsheet 3 for one disposable diaper on the first surface 10 a of the backsheet continuous body 10.
Thereby, the target tape 5 is affixed on the 1st surface 10a of the backsheet continuous body 10. FIG.
In this transfer device 20, the target tape continuous body 15 is cut by the cutter roll 22 into a substantially rectangular shape that is long in the direction along the width direction of the target tape continuous body 15, and the target tape 5 has its length. The sheet is attached to the backsheet continuous body 10 in a state where the direction is in the direction along the width direction of the backsheet continuous body 10.

At this time, before the target tape continuous body 15 is held by the suction drum 21 during the conveyance, the surface side that is the outer peripheral surface of the suction drum 21 when held by the suction drum 21, that is, the back side An adhesive is applied to the side of the sheet continuous body 10 that contacts the first surface 10a side. And the target tape 5 will be affixed on the backsheet continuous body 10 with this adhesive agent.
In addition, when apply | coating an adhesive agent to the target tape continuous body 15, when wearing the disposable diaper 1, it is made not to peel off the target tape 5 by the bending | flexion or twist of the back sheet 3 by a wearer's movement. Therefore, it is preferable to apply the adhesive to the target tape continuous body 15 in a planar shape by a coater or the like. However, it may be applied in any pattern such as spiral, Ω (omega), linear or dot.
Any adhesive can be used, but a hot melt adhesive is most preferable. Examples of the hot melt adhesive include polyolefin, ethylene / vinyl acetate copolymer, and synthetic rubber (styrene polymer, butadiene polymer, isoprene polymer). As other adhesives, acrylic resin-based pressure-sensitive adhesives can be used.

Here, when the target tape 5 is transferred and pasted to the backsheet continuous body 10, the tension rolls 24 and 25 apply tension to the backsheet continuous body 10 in the length direction of the backsheet continuous body 10. Make it work.
In this way, the longitudinal tension of the backsheet continuous body 10 is applied to the backsheet continuous body 10 by making the texture of the backsheet continuous body 10 uniform by the longitudinal tension, This is to make it easy to visually recognize the edge portion of the target tape 5 in a photographed image of the camera 31 described later in the inspection process. Moreover, it is also for making it easy to affix the target tape 5 in the predetermined position of the backsheet continuous body 10. FIG.
That is, when the tension in the length direction acts on the backsheet continuous body 10, the meshes between the fibers of the backsheet continuous body 10 are aligned, and the texture of the backsheet continuous body 10 as a whole is easily made uniform. Therefore, in the inspection process, the edge portion of the target tape 5 having a texture different from that of the backsheet continuous body 10 can be made conspicuous in the captured image of the camera 31, and the edge portion can be easily recognized.
Moreover, since the occurrence of wrinkles and bending of the backsheet continuous body 10 is suppressed by the tension in the length direction, it becomes easier to capture the edge portion of the target tape 5 more stably. In addition, since the wrinkles and slack are suppressed, the target tape 5 can be easily attached to a predetermined position of the backsheet continuous body 10, so that a defective disposable diaper in which the target tape 5 is not properly applied is manufactured. Can be suppressed as much as possible.

The magnitude of the tension applied to the first sheet member that is the backsheet continuous body 10 in the length direction depends on the width of the first sheet member, the forming material, and the like, but is 0.015 to 0. It is preferably about 0.081 N / mm, more preferably 0.029 to 0.14 N / mm.
When the magnitude of the tension in the length direction is less than 0.015 N / mm, the tension is too weak to make the texture of the entire first sheet member uniform. On the other hand, when the tension exceeds 0.081 N / mm, The tension is too strong, the fiber is broken and the texture is uneven, and wrinkles may be formed.

By the way, in this sticking step, when applying an adhesive between the backsheet continuous body 10 and the target tape 5, that is, in this embodiment, the target tape continuous body 15 is sucked and held by the suction drum 21. When the adhesive is applied before being applied, the adhesive-free region 16 where the adhesive is not applied is formed on a part of the periphery of the target tape 5.
Therefore, when the target tape 5 is affixed to the backsheet continuous body 10, the adhesive absence region 16 is not adhered to the backsheet continuous body 10 by the adhesive. In other words, a so-called dry edge is formed.
Thus, the adhesive-free region 16 is formed in the target tape 5 in order to prevent the adhesive from protruding from the target tape continuous body 15 when the adhesive is applied to the target tape continuous body 15. It is. This prevents the adhesive protruding from the target tape continuous body 15 from adhering to and contaminating surrounding equipment.
In this embodiment, as shown in FIG. 1, the adhesive tape is not applied to the peripheral edge portions on both ends in the width direction of the target tape continuous body 15, so the length direction of the target tape 5 cut by the cutter roll 22 is used. A non-existing region 16 is formed at both end edges.

Next, in the inspection process, the target tape 5 attached to the backsheet continuous body 10 is in a normal state in the portion corresponding to the ventral side of the backsheet 3 for one disposable diaper after the attaching process which is the preceding process. It is inspected whether it is stuck on.
At this time, when carrying out this inspection step, light is transmitted through the backsheet continuous body 10 to which the target tape 5 is attached, and the position of the edge portion of the target tape 5 is confirmed.

FIG. 3 shows an example of an inspection apparatus for performing an inspection process in the manufacturing method according to this embodiment.
The inspection apparatus 30 according to this embodiment includes a camera 31 that takes an image of the first surface 10a side to which the target tape 5 is attached, in the backsheet continuous body 10 to which the target tape 5 is attached, which is an inspection target. And an illumination member 32 that irradiates light from the second surface 10b side of the backsheet continuous body to which the target tape 5 is attached. Further, the back sheet continuous body 10 to which the target tape 5 is attached, which is the inspection target, is transported to the space between the camera 31 and the illumination member 32, and the operation control and transport means 33 of the camera 31 are controlled. And a control device 34 that performs drive control.

In this embodiment, the backsheet continuous body 10 to which the target tape 5 is attached is conveyed to the space between the camera 31 and the illumination member 32 and corresponds to the backsheet 3 for one disposable diaper. The position where the target tape 5 is affixed and its vicinity can be photographed with the camera 31 so that the entire target tape 5 is reflected in the portion.
That is, the conveying device 33 feeds the backsheet continuous body 10 into the space between the camera 31 and the illumination member 32 by a length corresponding to the backsheet 3 for one disposable diaper, and 1 of the disposable diaper. When the portion of the backsheet 3 for which the target tape 5 is attached reaches the shooting position of the camera 31, a shooting command from a visual amplifier 31a described later is output to the camera 31, thereby The camera 31 can appropriately photograph the portion where the target tape 5 is attached.

The illumination member 32 transmits light from the second surface 10b side of the backsheet continuous body 10 to the backsheet continuous body 10 to which the target tape 5 to be inspected is attached. And an illumination power source 32b for the light source 32a. Therefore, the camera 31 irradiates the illumination member 32 toward the second surface 10b side of the backsheet continuous body 10 and transmits the backsheet continuous body 10 to which the target tape 5 is attached in the direction of the first surface 10a. Shooting is performed with the transmitted light.
The illumination member 32 irradiates at least the entire photographing range of the camera 31 and allows the camera 31 to transmit a light amount necessary for photographing the inspection object. No trouble occurs due to a lack of light quantity or the like when shooting with the camera 31.

Here, in this embodiment, the backsheet continuous body 10 to which the target tape 5 to be inspected is attached is irradiated with infrared rays from the second surface 10b side, and the backsheet continuous body 10 and the target are irradiated. The tape 5 is transmitted.
In this way, the infrared rays are irradiated from the second surface 10b side of the backsheet continuous body 10 by visually erasing or thinning the pattern 8 attached to the backsheet continuous body 10 by the action of infrared rays. In the image taken by the camera 31, the pattern 8 is prevented from obstructing the grasping of the edge portion of the target tape 5, so that the shape of the target tape 5 and the position with respect to the back sheet continuous body 10 can be accurately determined. It is to make it.
That is, by transmitting infrared rays from the second surface 10b side of the backsheet continuous body 10 to which the target tape 5 is attached, the pattern 8 attached to the backsheet continuous body 10 is visually recognized in the captured image of the camera 31. Since the upper erased state or the thinned state is obtained, the edge portion of the target tape 5 is more clearly visible on the captured image of the camera 31 as the pattern 8 is visually erased or thinned. Thus, the accuracy of inspection is further improved.
The wavelength of the infrared rays irradiated by the illumination member 32 is preferably about 700 to 1000 nm, and most practically about 850 nm, although it depends on the components and colors of the ink forming the pattern 8.
In addition, although arbitrary things can be used as the light source 32a, it is preferable to use LED.

The camera 31 is an area camera or a line camera, and is in a state where a predetermined interval is provided between the first surface 10a of the back sheet continuous body 10 to which the target tape 5 to be inspected is attached. Has been placed.
That is, at least the entire width of the backsheet continuous body 10 can be photographed between the camera 31 and the backsheet continuous body 10 to which the target tape 5 is attached, and the backsheet continuous body from the illumination member 32 can be photographed. 10 and the amount of light transmitted through the target tape 5 are spaced by a distance that can ensure a resolution that allows the edge portion of the target tape 5 to be visually recognized stably by the captured image.
Thereby, when the image is taken by the camera 31, the overlap between the target tape 5 and the backsheet continuous body 10 due to the transmitted light from the illumination member 32 causes contrast (specifically, the target tape 5) on the photographed image. And the backsheet continuum 10 are darkened, and the non-overlapping portion (that is, the backsheet continuum 10 only) is brightened). Therefore, the position and shape of the target tape 5 with respect to the backsheet continuous body 10 can be grasped by the contrast.

The camera 31 includes a visual amplifier 31a connected to the control device 34. The visual amplifier 31a outputs a shooting command to the camera 31 according to a command from the control device 34, while the camera 31 Is configured to output image data taken toward the visual amplifier 31a.
The visual amplifier 31a outputs the input image data as a captured image, and determines whether the target tape 5 is normally attached to the backsheet continuous body 10 based on the captured image. Is possible.

The conveyance device 33 includes conveyance rollers 35 and 36 provided on the upstream side and the downstream side in the conveyance direction MD of the backsheet continuous body 10 on which the target tape 5 to be inspected is attached at the photographing position by the camera 31. An encoder 37 that measures the length of the transported backsheet continuous body 10 to which the target tape 5 is attached, based on the rotational speed or rotational angle of either one of the transport rollers 35 and 36. I have.
In the case of what is shown in FIG. 3, the back sheet | seat continuous body 10 with which the target tape 5 was affixed can be conveyed toward upper direction from the downward direction.
The operation of the transport device 33 is controlled by the control device 34, and the data measured by the encoder 37 is output to the control device 34, and the control device 34 performs transport rollers based on the data from the encoder 37. While controlling the rotation speed and rotation angle of 35 and 36, it outputs a signal for causing the visual amplifier 31a to issue a shooting command for the camera 31.
Moreover, in this conveyance apparatus 33, it is the same as the tension | tensile_strength of the length direction made to act on the back sheet | seat continuous body 10 in the affixing process with respect to the back sheet | seat continuous body 10 in which the target tape 5 was affixed during the inspection process. It is preferable to apply the tension. Thereby, since the state in which the texture of the backsheet continuous body 10 is made uniform is maintained, the difference in texture between the backsheet continuous body 10 and the target tape 5 having a different texture becomes clearer, and in the captured image of the camera The edge portion of the target tape 5 can be grasped more reliably.

Thus, in this inspection process, the edge portion of the target tape 5, in the case of this embodiment, the positions of the four peripheral edges of the target tape 5 can be captured on the photographed image by the photographed image of the camera 31. Therefore, it is possible to accurately grasp the overlapping state between the target tape 5 and the backsheet continuous body 10.
Therefore, since the relative position of the target tape 5 in the portion corresponding to the back sheet 3 for one disposable diaper of the back sheet continuous body 10 can be reliably grasped, the back sheet 3 is the back sheet continuous body. 10, it can be determined whether or not it is attached at an appropriate position where positional deviation is allowed.
In addition, when a part of the target tape 5 is peeled and bent more than necessary beyond the allowable range, that is, when the tape is peeled and bent more than the size of the adhesive-free region 16, The target tape 5 appears to be deformed in its edge portion or in its entirety. In addition, the bent portion looks darker because the amount of light transmission is reduced by the amount of overlap of the target tape 5. Thereby, it can be easily determined on the photographed image that the target tape 5 is not properly attached to the backsheet continuous body 10.
Furthermore, when the target tape 5 itself is not affixed to the backsheet continuous body 10, not only the edge portion of the target tape 5 is not visible on the photographed image, but also no contrast occurs. It can be easily determined that is not attached.
Therefore, in this inspection process, it is possible to easily and reliably grasp and determine whether or not the target tape 5 is normally attached to the backsheet continuous body 10 on the image captured by the camera 31.

After the inspection step, a step of laminating the absorber 4 on the top sheet side of the back sheet 3 in the back sheet continuous body 10, that is, on the second surface 10b is performed.
After the absorber 4 is formed by a known method, the absorber 4 is set at a predetermined interval with respect to the backsheet continuous body 10 conveyed with the second surface 10b side as an upper surface, that is, the disposable diaper 1 It laminates | stacks so that the absorber 4 may be mounted with respect to the part corresponded to the back seat | sheet 3 sheet. At this time, an adhesive such as a hot-melt adhesive is applied between the backsheet continuous body 10 and the absorbent body 4, and the absorbent body 4 is attached to the backsheet continuous body 10 and joined to each other. .
In addition, about the process of laminating | stacking the absorber 4 on such a backsheet continuous body 10, it can carry out with a well-known apparatus and method.

After the step of laminating the absorber 4 on the backsheet continuous body 10, the step of laminating the topsheet continuous body on the backsheet continuous body 10 on which the absorber 4 is laminated is performed.
This top sheet continuous body is laminated so as to cover the absorbent body 4 on the back sheet continuous body 10. At this time, an adhesive such as a hot-melt adhesive is applied between the top sheet continuous body, the back sheet continuous body 10 and the absorbent body 4, and the top sheet continuous body becomes the absorbent body 4 and the back sheet continuous body. 10 are bonded to each other.
As a result, a laminated body in which the absorber 4 is disposed between the back sheet continuous body 10 and the top sheet continuous body is formed.
In addition, about the process of laminating | stacking a topsheet continuous body on such a backsheet continuous body 10 with which the absorber 4 was laminated | stacked, it can carry out with a well-known apparatus and method.

After the step of laminating the top sheet continuous body, a cutting step of cutting the laminated body formed in this step into an embodiment of the disposable diaper 1 as a product is performed.
This cutting process forms the single disposable diaper 1 by cut | disconnecting the said laminated body with a well-known cutting device.
In addition, about this cutting process, it can carry out with a well-known apparatus and method.

Furthermore, after the cutting process, an abnormal part determined that the target tape 5 is not attached in a normal state to a part of the backsheet continuous body 10 to which the target tape 5 to be inspected is attached in the inspection process. When there exists, the exclusion process which excludes the disposable diaper 1 which uses the abnormal part from the conveyance line after a cutting process is implemented.
When an abnormal part is found in the inspection process, the visual amplifier 31a of the camera 31 outputs a signal indicating that the abnormal part has been detected to the control device 34, and the control device 34 determines that the abnormal part is based on the signal. In this exclusion step, the detection controller that detects the disposable diaper 1 including the abnormal part specifies the position of the abnormal part based on the abnormal part data stored by the control device 34. The detection controller detects the disposable diaper 1 including the abnormal portion based on the identified position of the abnormal portion, and pushes out the disposable diaper 1 including the abnormal portion by a pusher or the like from the conveyance line.
In addition, about this exclusion process, it can carry out with a well-known apparatus and method.

As mentioned above, according to the manufacturing method of the absorbent article of this embodiment, in the pasting step, the backsheet continuous body 10 that is the first sheet member and the target tape 5 that is the second sheet member. Since the adhesive tape is applied between them and the target tape 5 is applied to the backsheet continuous body 10 while applying a tension in the length direction of the backsheet continuous body 10, the backsheet continuous body 10 has a texture. It is stable, and it is easy to grasp the position of the edge portion of the target tape 5 and easily grasp the outer shape in the inspection process.
In addition, in the inspection process, light is transmitted from the second surface 10b side to the backsheet continuous body 10 to which the target tape 5 is attached, and the captured image is captured by the camera 31 from the first surface 10a side. Above, the edge part of the target tape 5 can be easily grasped | ascertained by the overlapping condition of the target tape 5 and the backsheet continuous body 10. FIG. Thereby, it is possible to easily grasp the deviation of the position of the target tape 5 with respect to the backsheet continuous body 10, an abnormal state in which a part of the target tape 5 is peeled off more than necessary and bent, or the target tape itself does not exist. be able to.
As a result, it is possible to easily and reliably determine whether the target tape 5 is attached to the backsheet continuous body 10 in a normal state, and reliably and stably prevent defective products from being manufactured. can do.

In the embodiment, the back sheet continuous body 10 is used as the first sheet member and the target tape 5 is used as the second sheet member. However, the first sheet member and the second sheet member constitute an absorbent article. In the inspection process, for example, whether the top sheet is normally attached to the back sheet or whether the absorber is normally attached to the back sheet, etc. You may make it test | inspect the sticking state of a sheet-like member.
Moreover, in the said embodiment, although the 1st sheet | seat member was made into the back sheet | seat coupling body 10 with which the back sheet | seat 3 was connected continuously in the length direction, this 1st sheet | seat member is one disposable diaper. It may be a minute backsheet.

In the embodiment, in the attaching step, one target tape 5 having a substantially rectangular shape is attached to the backsheet continuous body 10, but the small target tape is attached in the width direction of the backsheet continuous body. Alternatively, the two sheets may be attached to the back sheet continuous body in a state where they are arranged side by side. In this case, in the inspection process, two cameras that individually photograph each target tape may be used to photograph each target tape.

In the embodiment, the back sheet continuous body 10 that is the first sheet member and the target tape 5 that is the second sheet member have different total light transmittances of the irradiated light. The total light transmittance of the first sheet member and the second sheet member with respect to the irradiated light may be the same. In this case, even if the total light transmittance of the first sheet member and the second sheet member is the same, the first sheet member and the second sheet member overlap each other in the captured image by the camera. Since the contrast occurs between the part where the sheet is present and the part where it is not overlapped, it is possible to capture the edge part of the second sheet member.

In the embodiment, when applying the adhesive between the backsheet continuous body 10 and the target tape 5 in the attaching step, the adhesive is applied to a part of the periphery of the target tape 5 that is the second sheet member. Although the adhesive-free region 16 that is not applied has been formed, it is not always necessary to form this adhesive-free region in the second sheet member in the attaching step.

In the embodiment described above, the pattern 8 is given to the sheet surface of the backsheet continuous body 10 that is the first sheet member, but it is not always necessary to give the pattern to the sheet surface of the first sheet member.
Furthermore, in the said embodiment, although the pattern is not attached | subjected to the sheet | seat surface of the target tape 5 which is a 2nd sheet member, you may attach | subject a pattern to the sheet | seat surface of a 2nd sheet member.
Therefore, the pattern may be applied to both the first sheet member and the second sheet member, or to either one of the first sheet member and the second sheet member, or the first sheet member It does not have to be attached to either the sheet member or the second sheet member.
In addition, about a 1st sheet member and / or a 2nd sheet member, you may make it attach a pattern on a conveyance line in the pre-process of an attachment process, but before implementing this manufacturing method, You may manufacture using the 1st sheet member and / or the 2nd sheet member after giving a pattern in a place.

In the embodiment, in the inspection process, infrared rays are applied to the portion with the pattern 8 from the second surface 10b side of the backsheet continuous body 10 as the first sheet member, that is, the portion to which the target tape 5 is attached. The inspection is performed with the pattern 8 visually erased or thinned.
However, in the inspection process, the light irradiated to the first sheet member to which the second sheet member is attached is transmitted through the first sheet member to which the second sheet member is attached. As long as the position of the edge portion of the second sheet member affixed to the sheet member can be confirmed, infrared rays are not necessarily required. For example, visible light may be used when it is not necessary to erase or thin the pattern attached to the first sheet member and / or the second sheet member.

In the above-described embodiment, the case where the absorbent article manufactured in this embodiment is a tape-type disposable diaper 1 is described. However, as the absorbent article, the second sheet member formed in a predetermined size is attached to the first surface of the sheet surface of the first sheet member formed long in the conveyance direction, and the first A pants-type disposable diaper, sanitary napkin, incontinence pad, panty liner, as long as it is manufactured by attaching an absorber to the second surface of the sheet surface opposite to the first surface Any absorbent article can be used as long as it is necessary to inspect whether or not the second sheet member is attached to the first sheet member in a normal state.

1 disposable diaper (absorbent article)
5 Target tape (second sheet member)
8 Pattern 10 Back sheet continuum (first sheet member)
10a First surface of backsheet continuum 10b Second surface of backsheet continuum 16 Adhesive absence region 20 Transfer device 30 Inspection device 31 Camera 32 Illumination member

Claims

The second sheet member formed in a predetermined size is attached to the first surface of the sheet surface of the first sheet member formed long in the conveying direction, and the sheet surface of the first sheet member is A manufacturing method for manufacturing an absorbent article by attaching an absorbent body to a second surface, which is a surface opposite to the first surface, and forming the absorbent body in a size of a single absorbent article,
An affixing step of adhering the second sheet member having a different texture from the first sheet member at a predetermined position on the first surface of the first sheet member with an adhesive; An inspection step of inspecting whether or not the second sheet member is attached to the normal state of the first sheet member,
In the affixing step, the first sheet member and the second sheet member are coated with an adhesive, and tension is applied in the length direction of the first sheet member. Affixing the second sheet member to the sheet member;
In the inspection step, light is transmitted to the first sheet member to which the second sheet member is attached, and the position of the edge portion of the second sheet member is confirmed. .
The method for manufacturing an absorbent article according to claim 1, wherein the first sheet member and the second sheet member have different total light transmittances of the light.
In the affixing step, when applying an adhesive between the first sheet member and the second sheet member, there is no adhesive that does not apply the adhesive to a part of the periphery of the second sheet member. The manufacturing method of the absorbent article of Claim 1 or Claim 2 which forms a area | region.
When it is determined in the inspection step that the second sheet member is not attached to the first sheet member in a normal state, the second sheet member in the first sheet member is subjected to the second step after the inspection step. The method for producing an absorbent article according to any one of claims 1 to 3, wherein the absorbent article formed by a portion where the sheet member is not attached in a normal state is excluded.
The method for manufacturing an absorbent article according to any one of claims 1 to 4, wherein the first sheet member and / or the second sheet member has a pattern formed on a sheet surface.
6. The absorption according to claim 5, wherein in the inspection step, the first sheet member and / or the second sheet member is performed in a state where infrared rays are transmitted through a portion where a pattern is formed and the pattern is erased or thinned. A method for producing an article.