CA2041485C - Method of applying a manually operated dispenser to a container using a hot melt liner material - Google Patents
Method of applying a manually operated dispenser to a container using a hot melt liner materialInfo
- Publication number
- CA2041485C CA2041485C CA002041485A CA2041485A CA2041485C CA 2041485 C CA2041485 C CA 2041485C CA 002041485 A CA002041485 A CA 002041485A CA 2041485 A CA2041485 A CA 2041485A CA 2041485 C CA2041485 C CA 2041485C
- Authority
- CA
- Canada
- Prior art keywords
- dispenser
- hot melt
- cap
- container
- rim surface
- 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 - Fee Related
Links
Classifications
-
- 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
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
- B05C5/0208—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work for applying liquid or other fluent material to separate articles
- B05C5/0212—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work for applying liquid or other fluent material to separate articles only at particular parts of the articles
- B05C5/0216—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work for applying liquid or other fluent material to separate articles only at particular parts of the articles by relative movement of article and outlet according to a predetermined path
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
- B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
- B05B11/10—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
- B05B11/1042—Components or details
- B05B11/1043—Sealing or attachment arrangements between pump and container
- B05B11/1045—Sealing or attachment arrangements between pump and container the pump being preassembled as an independent unit before being mounted on the container
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
- B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
- B05B11/10—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
- B05B11/1042—Components or details
- B05B11/1052—Actuation means
- B05B11/1056—Actuation means comprising rotatable or articulated levers
- B05B11/1057—Triggers, i.e. actuation means consisting of a single lever having one end rotating or pivoting around an axis or a hinge fixedly attached to the container, and another end directly actuated by the user
Abstract
METHOD OF APPLYING A MANUALLY OPERATED DISPENSER
TO A CONTAINER USING A HOT MELT LINER MATERIAL
ABSTRACT OF THE DISCLOSURE
A hot melt gasket or liner is applied to a portion of a manually operated dispenser having a closure cap for coupling the dispenser to a container. The material may contain a pre-determined amount of gaseous fluid to form a foamed hot melt material having a predetermined density. After the material cools to room temperature, it forms an anti-slip gasket seal which, upon coupling the cap to the container neck, the hot melt material is compressed for restricting movement of the dispenser about the central axis of the container and for pre-venting formation of a leak path between the container rim sur-face and the dispenser.
TO A CONTAINER USING A HOT MELT LINER MATERIAL
ABSTRACT OF THE DISCLOSURE
A hot melt gasket or liner is applied to a portion of a manually operated dispenser having a closure cap for coupling the dispenser to a container. The material may contain a pre-determined amount of gaseous fluid to form a foamed hot melt material having a predetermined density. After the material cools to room temperature, it forms an anti-slip gasket seal which, upon coupling the cap to the container neck, the hot melt material is compressed for restricting movement of the dispenser about the central axis of the container and for pre-venting formation of a leak path between the container rim sur-face and the dispenser.
Description
METHOD OF APPLYING A MANUALLY OPERATED DISPENSER
TO A CONTAINER USING A HOT MELI' LINER MATERIAL
BACKGROUND OF THE INVENTION
.
This invention relates generally to a technique for seali.ng the closure cap oE a manually operated dispenser to a container, utilizing a liner of hot melt material.
Manually actuated dispensers, such as the fingertip actuated and the trigger actuated types, are mounted on the neck of a container utilizing a closure cap coupled to the dispenser.
A separate liner or gasket of elastomeric material, such as polyethylene, isobutylene/polyethylene or foamed polyethylene, is typically provided for sealing the package from leakage of product from the container along a path between the neck rim and the lower end of the dispenser. The liner is positioned between the neck rim and an annulax surface at the lower end of the dispenser, and is press-fit~ed, snap-fitted or other-wise engaged with the dispenser at its lower end for retaining the gasket in place prior to assembly with ~he container.
The closure cap may be internally threaded for en~age-ment with the external threads of the container neck. On tightening the closure, l.e., "torquing down", the tightened closure cap oftentimes has the tendency to back-off or loosen, . . ...
especially during shipment and storage, thereby causing leakage o~ product from the container. For example, vibrations during shipment can cause the closure cap to loosen as the compressed gasket seal slips and relaxes. Likewise, should the dispenser body reorient itsel on the container during shipment or pack-aging or handling prior to shipment, torque ~ack--off has been experienced upon turning movement of the dispenser body about the central axis of the container in a loosening direction.
Moreover, if the dispenser body is reoriented during use rela-tive to the container by turning in a looseninq direction, the closure cap tends to back-o~, causing leakage.
Otherwise, the metallic closure cap may be swaged on to the container neck for coupling the cap to the container by de-forming the cap during a swaging process. The separate gasket liner used oftentimes proves ineffective for its intended seal-ing purpose if the liner is too hard and/or if the cap is not carefully swaged in place.
The selection of different liners for their relative softness and hardness depending on the closure cap style, con-tainer size and use, product compatibility, dispenser size and style, etc., renders it difficult for the dispenser supplier to meet all the needs of its customers.
Moreover, during shipment and handling separate gaskets easily fall away from the dispenser package to which they are . .
attached, are costly to manufact-lre ancl assemble, and present handling pro~lems during assembly an~ s~Jrage.
rntegral liners have been provided to avoid gasket ~all-out from the dispenser body. Such liners are molded as part o~
the body and of the same plastic material, thereby limiting the integral liner to the choice o~ dispenser body material. A
soft or tacky liner is therefore not made possible with this approach.
SUMMARY QF THE XNVENTION
In accordance with the invention, a hot melt material is utilized as a gasket or liner which adheres to the lower end of the dispenser when applied in position to overlie the rim of the neck of a container to which a manually operated dispenser is mounted. The hot melt material is applied in a molten state, and the material ma~ contain a predetermined amount of gaseous fluid, such as nitrogen, so as to form a foamed hot melt material having a predetermined density, compressibility and tackiness. The material is applied in the form of an annu-lar bead in the molten state to a portion of the dispenser, and is allowed to cool to room temperature to form an anti-slip gasket seal.
, , , Such portion of the dispenser may comprise a separate sleeve part having an annular sur~ace for receiving the hot melt material. The sleeve is assembled to the dispenser, as by press fitting, and engages with the closure cap before the cap is coupled to the container neck.
Alternatively, such dispenser portion may Eorm an end of the dispenser body having an annular surface for receiving the hot melt material, with the closure cap being snap-fitted to the dispenser body, and coupled to the container neck.
If the dispenser is intended to be removed from the con-tainer for reilling, a predetermined amount of gaseous fluid will be injected into the hot melt material. If needs call for adherence of the dispenser body to the container, a minor amount o gaseous fluid, or none at all, will be injected into the hot melt material.
Upon mounting the closure cap to the container neck, the cooled hot melt material is compressed against the rim sur~ace of the neck such that the hot melt ;material restricts unthread-ing of a threaded cap, and loosening of a swaged cap, while be-ing adhered or unadhered to the rim surface, depending on thenitrogen gas injected, and prevents formation of a leak path between the rim surface and the dispenser.
The gaseous ~luid, which may comprise nitrogen gas, is injected into the hot melt material under a predetermined pres-sure to maintain the fluid in solution until the annular bead , , is applied to the dispenser portion. In such manner, the gaseous fluid is trapped in the hot melt rna-terial as bubbles as the ma-terial cools.
The applied bead of hot melt material may be of sufficient quantity that upon thread-coupling the closure cap to the container, the hot melt ma-terial extrudes into contact with the threads of the cap to further restrict unthreading of the cap.
By controlling the density and compressibility of the hot melt material, depending on the amount, or none at all, of the nitrogen gas injected, a wide variety of end uses for applying a manually operated dispenser to a container are made possible in accordance with the present technique.
The invention in one claimed aspect provides a method of applying a manually operated dispenser to a container having a central axis and having a neck including a rim surface, the dispenser having an end wall presenting a flat annular surface for overlying the rim surface, and an outwardly extending flange on the end wall. The method comprises the steps of providing a quantity of hot melt, tacky material in a molten state, the material containing a predetermined amount of a pressurized gaseous fluid to form a foamed hot melt material having a predetermined density and compressibility, applying an annular bead of the hot material in the molten state to the flat annular surface of the dispenser for bonding the bead thereto in position to engage the rim surface, the annular bead being applied in a ;;-~ ~ . .: .
controlled amount and at a con-trolled rate so as to be deposited as an undeformed bead Of material. The method Eurther includes allowiny the hot melt material to cool to room temperature to form an anti-slip gasket seal, providing a separate closure cap having an inwardly extending flange, engaging the inwardly and outwardly extending flanges for coupling the cap to the dispenser while permitting relative rotation of the cap to the dispenser about the central axis of the container, providing cooperating thread means acting between the cap and the container neck, and thread coupling the closure cap to the container neck to compress the cooled and tacky hot melt material against the rim surface such that the tacky hot melt material restricts movement of the dispenser about the central axis while remaining unadhered to the rim surface so as to avoid unthreading of the cap thereby sealing against leakage from between the rim surface and the dispenser.
Other aspects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF T~E DRAWINGS
Figure 1 is a side elevational view, partly in section, of a trigger actuated dispenser which includes a sleeve-like part and which is shown applied to the container after appli.cation of the hot melt liner according to the invention;
. --6--, d ~ ~
Figure 2 is a side view, partly in section, of t.he sleeve-like part of the Figure 1 dispenser, at a sliqh~ly en-larqed scale, illustrating the process of applying a bead o~
hot melt material thereto;
Figure 3 is a view similar to Figure 1, at a slightly enlarged scale, showing the detalls of the hot melt liner o~
; the invention after being compressed upon cooling;
Figure 4 is a view similar to Figure 1 of another type I` trigger actuated dispenser which includes an alternative type 10 I closure cap applied to the container;
!! I
¦ Figure 5 is a view similar to Figure 4, at a slightly ¦
enlarged scale, illustrating the process of applying the bead ¦
of hot melt material to the lower end oÇ the dispenser body;
., Figure 6 is a view similar to Figure 5 showing in.de-lS tail, at a slightly enlarged scale, the compressed bead of hot melt material;
Figure 7 is a view similar to Figure 3 showing a j non-threading type closure applied to the container;
il Figure 8 is a schematic illustration of the machine !
20~, which may be utili~ed in applying the bead of hot melt mater-¦l ial; and Figure 9 is a block diagram illustrating the steps~car- !
ried out in applying the ~ead of hot melt material in place...
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TO A CONTAINER USING A HOT MELI' LINER MATERIAL
BACKGROUND OF THE INVENTION
.
This invention relates generally to a technique for seali.ng the closure cap oE a manually operated dispenser to a container, utilizing a liner of hot melt material.
Manually actuated dispensers, such as the fingertip actuated and the trigger actuated types, are mounted on the neck of a container utilizing a closure cap coupled to the dispenser.
A separate liner or gasket of elastomeric material, such as polyethylene, isobutylene/polyethylene or foamed polyethylene, is typically provided for sealing the package from leakage of product from the container along a path between the neck rim and the lower end of the dispenser. The liner is positioned between the neck rim and an annulax surface at the lower end of the dispenser, and is press-fit~ed, snap-fitted or other-wise engaged with the dispenser at its lower end for retaining the gasket in place prior to assembly with ~he container.
The closure cap may be internally threaded for en~age-ment with the external threads of the container neck. On tightening the closure, l.e., "torquing down", the tightened closure cap oftentimes has the tendency to back-off or loosen, . . ...
especially during shipment and storage, thereby causing leakage o~ product from the container. For example, vibrations during shipment can cause the closure cap to loosen as the compressed gasket seal slips and relaxes. Likewise, should the dispenser body reorient itsel on the container during shipment or pack-aging or handling prior to shipment, torque ~ack--off has been experienced upon turning movement of the dispenser body about the central axis of the container in a loosening direction.
Moreover, if the dispenser body is reoriented during use rela-tive to the container by turning in a looseninq direction, the closure cap tends to back-o~, causing leakage.
Otherwise, the metallic closure cap may be swaged on to the container neck for coupling the cap to the container by de-forming the cap during a swaging process. The separate gasket liner used oftentimes proves ineffective for its intended seal-ing purpose if the liner is too hard and/or if the cap is not carefully swaged in place.
The selection of different liners for their relative softness and hardness depending on the closure cap style, con-tainer size and use, product compatibility, dispenser size and style, etc., renders it difficult for the dispenser supplier to meet all the needs of its customers.
Moreover, during shipment and handling separate gaskets easily fall away from the dispenser package to which they are . .
attached, are costly to manufact-lre ancl assemble, and present handling pro~lems during assembly an~ s~Jrage.
rntegral liners have been provided to avoid gasket ~all-out from the dispenser body. Such liners are molded as part o~
the body and of the same plastic material, thereby limiting the integral liner to the choice o~ dispenser body material. A
soft or tacky liner is therefore not made possible with this approach.
SUMMARY QF THE XNVENTION
In accordance with the invention, a hot melt material is utilized as a gasket or liner which adheres to the lower end of the dispenser when applied in position to overlie the rim of the neck of a container to which a manually operated dispenser is mounted. The hot melt material is applied in a molten state, and the material ma~ contain a predetermined amount of gaseous fluid, such as nitrogen, so as to form a foamed hot melt material having a predetermined density, compressibility and tackiness. The material is applied in the form of an annu-lar bead in the molten state to a portion of the dispenser, and is allowed to cool to room temperature to form an anti-slip gasket seal.
, , , Such portion of the dispenser may comprise a separate sleeve part having an annular sur~ace for receiving the hot melt material. The sleeve is assembled to the dispenser, as by press fitting, and engages with the closure cap before the cap is coupled to the container neck.
Alternatively, such dispenser portion may Eorm an end of the dispenser body having an annular surface for receiving the hot melt material, with the closure cap being snap-fitted to the dispenser body, and coupled to the container neck.
If the dispenser is intended to be removed from the con-tainer for reilling, a predetermined amount of gaseous fluid will be injected into the hot melt material. If needs call for adherence of the dispenser body to the container, a minor amount o gaseous fluid, or none at all, will be injected into the hot melt material.
Upon mounting the closure cap to the container neck, the cooled hot melt material is compressed against the rim sur~ace of the neck such that the hot melt ;material restricts unthread-ing of a threaded cap, and loosening of a swaged cap, while be-ing adhered or unadhered to the rim surface, depending on thenitrogen gas injected, and prevents formation of a leak path between the rim surface and the dispenser.
The gaseous ~luid, which may comprise nitrogen gas, is injected into the hot melt material under a predetermined pres-sure to maintain the fluid in solution until the annular bead , , is applied to the dispenser portion. In such manner, the gaseous fluid is trapped in the hot melt rna-terial as bubbles as the ma-terial cools.
The applied bead of hot melt material may be of sufficient quantity that upon thread-coupling the closure cap to the container, the hot melt ma-terial extrudes into contact with the threads of the cap to further restrict unthreading of the cap.
By controlling the density and compressibility of the hot melt material, depending on the amount, or none at all, of the nitrogen gas injected, a wide variety of end uses for applying a manually operated dispenser to a container are made possible in accordance with the present technique.
The invention in one claimed aspect provides a method of applying a manually operated dispenser to a container having a central axis and having a neck including a rim surface, the dispenser having an end wall presenting a flat annular surface for overlying the rim surface, and an outwardly extending flange on the end wall. The method comprises the steps of providing a quantity of hot melt, tacky material in a molten state, the material containing a predetermined amount of a pressurized gaseous fluid to form a foamed hot melt material having a predetermined density and compressibility, applying an annular bead of the hot material in the molten state to the flat annular surface of the dispenser for bonding the bead thereto in position to engage the rim surface, the annular bead being applied in a ;;-~ ~ . .: .
controlled amount and at a con-trolled rate so as to be deposited as an undeformed bead Of material. The method Eurther includes allowiny the hot melt material to cool to room temperature to form an anti-slip gasket seal, providing a separate closure cap having an inwardly extending flange, engaging the inwardly and outwardly extending flanges for coupling the cap to the dispenser while permitting relative rotation of the cap to the dispenser about the central axis of the container, providing cooperating thread means acting between the cap and the container neck, and thread coupling the closure cap to the container neck to compress the cooled and tacky hot melt material against the rim surface such that the tacky hot melt material restricts movement of the dispenser about the central axis while remaining unadhered to the rim surface so as to avoid unthreading of the cap thereby sealing against leakage from between the rim surface and the dispenser.
Other aspects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF T~E DRAWINGS
Figure 1 is a side elevational view, partly in section, of a trigger actuated dispenser which includes a sleeve-like part and which is shown applied to the container after appli.cation of the hot melt liner according to the invention;
. --6--, d ~ ~
Figure 2 is a side view, partly in section, of t.he sleeve-like part of the Figure 1 dispenser, at a sliqh~ly en-larqed scale, illustrating the process of applying a bead o~
hot melt material thereto;
Figure 3 is a view similar to Figure 1, at a slightly enlarged scale, showing the detalls of the hot melt liner o~
; the invention after being compressed upon cooling;
Figure 4 is a view similar to Figure 1 of another type I` trigger actuated dispenser which includes an alternative type 10 I closure cap applied to the container;
!! I
¦ Figure 5 is a view similar to Figure 4, at a slightly ¦
enlarged scale, illustrating the process of applying the bead ¦
of hot melt material to the lower end oÇ the dispenser body;
., Figure 6 is a view similar to Figure 5 showing in.de-lS tail, at a slightly enlarged scale, the compressed bead of hot melt material;
Figure 7 is a view similar to Figure 3 showing a j non-threading type closure applied to the container;
il Figure 8 is a schematic illustration of the machine !
20~, which may be utili~ed in applying the bead of hot melt mater-¦l ial; and Figure 9 is a block diagram illustrating the steps~car- !
ried out in applying the ~ead of hot melt material in place...
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2, ~ ,rj DETAILED DESCRIPTION OF THE INVENTION
Turlling now to the drawings wherein like re~erence char-acters refer to like and corresponding parts throughout the several views, a manually operated dispenser 10, o~ the trigyer actuated type, is shown in Figure 1 as including a pump body 11, a shroud 12, a trigger actuator 13, a nozzle cap 14, a dip ~ tube lS, etc., as known in this art. The dispenser further in-,' cludes a sleeve-like element 16 which telescopes over a lower i cylindrical portion of body 11 and is force-fitted in place.
10; The inner surface of element 16 may be rouqhened or may contain annular ribs to enhance the force fit with the lower end por-tion of the pump body.
Element 16 has an outwardly extending flange 17 in en-gagement with an inwardly extending flange 18 of an internally threaded closure cap 19.
Upon assembly, element 16 is inserted through the cen-tral opening of the cap until flanges 17 and 18 engage, and this sub-assembly is then coupled to the dispenser as element Il 16 is telescoped about the lower end portion of the pump body.
201 As known in the art, a separate gasket seal ~not shown) is normally installed about the lower end of element 16 in ! position to overlie the upper rim 21 of threaded container neclc ; -8-,1 ;
~i'J if ~ f~
22, and cap 19 is then threaded dowll onto the container neck as well known in this art. The dip tube extends into the product contained within bottle or container 23, through which product is suctioned into the body 11 upon each suction stroke of the trigger 13, and is dispensed during each compression stroke.
In lieu of a separate gasket, which is not altogether reliable in preventing leakage between the neck rim surface and the dispenser, and which can fall away from the dispenser dur-ing shipping, handling or packaging, a hot melt rnaterial 24 is applied as a continuous bead along annular surface 25 of sleeve element 16. Thus, before the sub-assembly of elernent 16 and cap 19 as aforedescribed, element 16 is mounted on a rotatable holding fi~ture ~or rotation in the direction o the arrow of Figure 2 as the hot melt material is applied through a dis-charge no7zle 26.
The machine used for this purpose is illustrated in Fig-ure 7 and in block diagram form in Figure 8.
A hot melt unit 27 is mounted on a suitable support 28, , the unit containing a quantity of hot melt material heated by a 20, suitable heater 29 for maintaining the hot melt material in a molten state.
A pressure tank 31~ containing liquid nitrogen, injects nitrogen gas into the molten hot melt material via line 32 as , set by pressure control 33 for controlling the amount of pres-sure at which the gas is allowed to enter the hot melt unit.
_9 _ 5~
Nitrogen is chosen because of its reliability in maintaininq agiven pressure upon expansion as a gaseous fluid. The system is pressurized to maintain the gas in solution until the hot melt is dispensed via noæ~le 26 upon which the gas attempts to escape from the molten hot melt material. The gas is trapped in the gasket material as bubbles as the hot melt material cools to room temperature. The density and compressibility of the material can be controlled by the operator depending on the' quantity of gas injected. For example, if no gas is injected,;
Il I
lq, the hot melt will rernain sufficiently tacky upon cooling so as to adhere to rim surface 21. Otherwise, if the dispenser is to be removed from the container for reilling, a predetermined amount of the gas will be injected to render the hot melt tacky upon cooling but unadhered to rirn surface 21. The hot melt, under all conditions, will adhere to surface 25 upon applica-l tion, and will prevent slippage of the dispenser relative to¦
the container.
; Nozzle 26, extending from the hot melt unit, is mounted j for vertical movement as shown relative to a holding fix-2d ture 34 on which element 16 is mounted in the position of Fig-ure 2 with its surface ~5 facing upwardly. The fixture is rotated about its central axis by a variable speed motor 35, ! and a timer control 36 is operatively connected with the nozzle , . --1 0--2 ~ t~
~or controlling the interval of time the nozzle will dispens~
the hot melt material.
The hot melt unit has a density control valve 37 for controlling the amount of nitrogen gas introduced into solution with the hot melt material.
A fixture speed control 38 reyulates variable spee~
motor 35 to the desired r.p.m. Tachometer 39 indicates the fixture speed in r.p.m., and air pressure regulator ~l controls the nozzle solenoid (not shown) which opens and closes the ln' nozzle needle valve during the hot melt application process.
When applying the annular bead of hot melt material to surface 25 as illustrated in Figure 2, the material should have ;; strong adhesive bonding characteristics in this molten state sc as to adhere to surface 25. Known tackifier resins are there-fore included in the hot melt material, and the amount oftack-reducing materials may be balanced against the need for Il tack in the molten state. Variation of the ma~erial and d~nsi-ty and tack will be determined by the marketeer requirements.
And, by the application cycle, the precise amount of material 20l will be applied to either cause the dispenser 10 to adhere and I!
'I bind closure cap in place on the container, or to render the hot melt material to function only as a gasket liner, in which case the dispenser can be removed from the container upon un-threading the closure for refilling.
I I
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After the hot melt material cools to room temperature, the dispenser may be thread-coupled to the container neck upon threading of the cap 19, whereupon the hot melt material is cornpressed against rim surEace 25 for restricting unthreading (torque back-off) of the cap while remaininy unadhered to the rim surface. The compressed hot melt material likewise pre-vents formation of a leak path between the rim surface and the dispenser. Of course, depending on variation of the material I in density and tackiness as mentioned above, the hot melt 10l' material may be sufficiently tacky to bind to rim sur~ace 21, depending on specific needs. Moreover, upon threading down the closure cap, the hot melt material, depending on the size of the bead, may be caused to extrude into contact with the cap i threads to further restrict unthreading of the cap.
lS ' Another trigger actuated dispenser 42 is shown in Fig-!' ure 4, which is structured to be mounted on container 23 uti-! li2ing a closure cap 43 similar to that disclosed in U.S.
Patent 4,361,256. The lower end of dispenser body 11 has an 1 external annular flange 44, and closure cap 43 has a ~lexible 20~l conical skirt 45 in snap-fitting engagement with the flange for positively retaining the body and the cap together. Thus, ele-ment 16 is eliminated, and the cap is coupled to an integral portion of the dispenser body itself.
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i I , On tightening the closure on the container neck, the ~lexible conical skirt on the cap deorms to sorne extent to en-I-ance the tight seal between the body and the container neck, and to improve upon the tight engagement between the cap and the lower portion o~ the pump body.
If a separate known gasket seal ls interposed between the lower end of the dispenser body and the rim surface 21 of the container neck, the tiqhtened closure cap may tend to ; back-off or loosen during shipment and storage, thereby causing leakage of product from the container.
Be~ore cap 43 is snap-fitted in place, the dispenser body is mounted on holding fixture 34 with its surface 25 fac-ing upwardly for application of the molten bead of hot melt material 24 via no~zle 26 in the same manner as aforede-scribed. Cap 43 may be then snap-fitted in place, threaded down onto the container neck to compress the hot melt material as in the manner and for the purpose described with reference to Figures l to 3.
The present inventio~ is not limited to application for use with a thread closure described with reference to Figs. l and 4. For example, a metallic closure cap 46 is shown in Fig. 7 having its flange 18 engaging flange 17 of sleeve 16, the cap being swaged as at 47 around an external annular rib 48 provided on neck 22. The hot melt is compressed upon swaging' . . , and functions in the same manner described above or a thread cap. And, the hot melt may extrude into contact with cap ~6 to prevent cap movement, as described above.
Obviously, many other modifications and variations of S the present invention are made possible in the light of the above teachings. For example, compressed air may be utilized in lieu of pressurized nitrogen, and other manually operated dispensers than those disclosed may incorporate the invention, without departing from the spirit o~ the present invention. It is therefore to be understood that within the scope o the ap-pended claims the in~ention may be practiced otherwise than as specifically described.
.'
Turlling now to the drawings wherein like re~erence char-acters refer to like and corresponding parts throughout the several views, a manually operated dispenser 10, o~ the trigyer actuated type, is shown in Figure 1 as including a pump body 11, a shroud 12, a trigger actuator 13, a nozzle cap 14, a dip ~ tube lS, etc., as known in this art. The dispenser further in-,' cludes a sleeve-like element 16 which telescopes over a lower i cylindrical portion of body 11 and is force-fitted in place.
10; The inner surface of element 16 may be rouqhened or may contain annular ribs to enhance the force fit with the lower end por-tion of the pump body.
Element 16 has an outwardly extending flange 17 in en-gagement with an inwardly extending flange 18 of an internally threaded closure cap 19.
Upon assembly, element 16 is inserted through the cen-tral opening of the cap until flanges 17 and 18 engage, and this sub-assembly is then coupled to the dispenser as element Il 16 is telescoped about the lower end portion of the pump body.
201 As known in the art, a separate gasket seal ~not shown) is normally installed about the lower end of element 16 in ! position to overlie the upper rim 21 of threaded container neclc ; -8-,1 ;
~i'J if ~ f~
22, and cap 19 is then threaded dowll onto the container neck as well known in this art. The dip tube extends into the product contained within bottle or container 23, through which product is suctioned into the body 11 upon each suction stroke of the trigger 13, and is dispensed during each compression stroke.
In lieu of a separate gasket, which is not altogether reliable in preventing leakage between the neck rim surface and the dispenser, and which can fall away from the dispenser dur-ing shipping, handling or packaging, a hot melt rnaterial 24 is applied as a continuous bead along annular surface 25 of sleeve element 16. Thus, before the sub-assembly of elernent 16 and cap 19 as aforedescribed, element 16 is mounted on a rotatable holding fi~ture ~or rotation in the direction o the arrow of Figure 2 as the hot melt material is applied through a dis-charge no7zle 26.
The machine used for this purpose is illustrated in Fig-ure 7 and in block diagram form in Figure 8.
A hot melt unit 27 is mounted on a suitable support 28, , the unit containing a quantity of hot melt material heated by a 20, suitable heater 29 for maintaining the hot melt material in a molten state.
A pressure tank 31~ containing liquid nitrogen, injects nitrogen gas into the molten hot melt material via line 32 as , set by pressure control 33 for controlling the amount of pres-sure at which the gas is allowed to enter the hot melt unit.
_9 _ 5~
Nitrogen is chosen because of its reliability in maintaininq agiven pressure upon expansion as a gaseous fluid. The system is pressurized to maintain the gas in solution until the hot melt is dispensed via noæ~le 26 upon which the gas attempts to escape from the molten hot melt material. The gas is trapped in the gasket material as bubbles as the hot melt material cools to room temperature. The density and compressibility of the material can be controlled by the operator depending on the' quantity of gas injected. For example, if no gas is injected,;
Il I
lq, the hot melt will rernain sufficiently tacky upon cooling so as to adhere to rim surface 21. Otherwise, if the dispenser is to be removed from the container for reilling, a predetermined amount of the gas will be injected to render the hot melt tacky upon cooling but unadhered to rirn surface 21. The hot melt, under all conditions, will adhere to surface 25 upon applica-l tion, and will prevent slippage of the dispenser relative to¦
the container.
; Nozzle 26, extending from the hot melt unit, is mounted j for vertical movement as shown relative to a holding fix-2d ture 34 on which element 16 is mounted in the position of Fig-ure 2 with its surface ~5 facing upwardly. The fixture is rotated about its central axis by a variable speed motor 35, ! and a timer control 36 is operatively connected with the nozzle , . --1 0--2 ~ t~
~or controlling the interval of time the nozzle will dispens~
the hot melt material.
The hot melt unit has a density control valve 37 for controlling the amount of nitrogen gas introduced into solution with the hot melt material.
A fixture speed control 38 reyulates variable spee~
motor 35 to the desired r.p.m. Tachometer 39 indicates the fixture speed in r.p.m., and air pressure regulator ~l controls the nozzle solenoid (not shown) which opens and closes the ln' nozzle needle valve during the hot melt application process.
When applying the annular bead of hot melt material to surface 25 as illustrated in Figure 2, the material should have ;; strong adhesive bonding characteristics in this molten state sc as to adhere to surface 25. Known tackifier resins are there-fore included in the hot melt material, and the amount oftack-reducing materials may be balanced against the need for Il tack in the molten state. Variation of the ma~erial and d~nsi-ty and tack will be determined by the marketeer requirements.
And, by the application cycle, the precise amount of material 20l will be applied to either cause the dispenser 10 to adhere and I!
'I bind closure cap in place on the container, or to render the hot melt material to function only as a gasket liner, in which case the dispenser can be removed from the container upon un-threading the closure for refilling.
I I
i ftJ ~ l f~
After the hot melt material cools to room temperature, the dispenser may be thread-coupled to the container neck upon threading of the cap 19, whereupon the hot melt material is cornpressed against rim surEace 25 for restricting unthreading (torque back-off) of the cap while remaininy unadhered to the rim surface. The compressed hot melt material likewise pre-vents formation of a leak path between the rim surface and the dispenser. Of course, depending on variation of the material I in density and tackiness as mentioned above, the hot melt 10l' material may be sufficiently tacky to bind to rim sur~ace 21, depending on specific needs. Moreover, upon threading down the closure cap, the hot melt material, depending on the size of the bead, may be caused to extrude into contact with the cap i threads to further restrict unthreading of the cap.
lS ' Another trigger actuated dispenser 42 is shown in Fig-!' ure 4, which is structured to be mounted on container 23 uti-! li2ing a closure cap 43 similar to that disclosed in U.S.
Patent 4,361,256. The lower end of dispenser body 11 has an 1 external annular flange 44, and closure cap 43 has a ~lexible 20~l conical skirt 45 in snap-fitting engagement with the flange for positively retaining the body and the cap together. Thus, ele-ment 16 is eliminated, and the cap is coupled to an integral portion of the dispenser body itself.
i, ~
; !
., '.
i I , On tightening the closure on the container neck, the ~lexible conical skirt on the cap deorms to sorne extent to en-I-ance the tight seal between the body and the container neck, and to improve upon the tight engagement between the cap and the lower portion o~ the pump body.
If a separate known gasket seal ls interposed between the lower end of the dispenser body and the rim surface 21 of the container neck, the tiqhtened closure cap may tend to ; back-off or loosen during shipment and storage, thereby causing leakage of product from the container.
Be~ore cap 43 is snap-fitted in place, the dispenser body is mounted on holding fixture 34 with its surface 25 fac-ing upwardly for application of the molten bead of hot melt material 24 via no~zle 26 in the same manner as aforede-scribed. Cap 43 may be then snap-fitted in place, threaded down onto the container neck to compress the hot melt material as in the manner and for the purpose described with reference to Figures l to 3.
The present inventio~ is not limited to application for use with a thread closure described with reference to Figs. l and 4. For example, a metallic closure cap 46 is shown in Fig. 7 having its flange 18 engaging flange 17 of sleeve 16, the cap being swaged as at 47 around an external annular rib 48 provided on neck 22. The hot melt is compressed upon swaging' . . , and functions in the same manner described above or a thread cap. And, the hot melt may extrude into contact with cap ~6 to prevent cap movement, as described above.
Obviously, many other modifications and variations of S the present invention are made possible in the light of the above teachings. For example, compressed air may be utilized in lieu of pressurized nitrogen, and other manually operated dispensers than those disclosed may incorporate the invention, without departing from the spirit o~ the present invention. It is therefore to be understood that within the scope o the ap-pended claims the in~ention may be practiced otherwise than as specifically described.
.'
Claims (3)
1. A method of applying a manually operated dispenser to a container having a central axis and having a neck including a rim surface, the dispenser having an end wall presenting a flat annular surface for overlying the rim surface, and an outwardly extending flange on said end wall, the method comprising the steps of providing a quantity of hot melt, tacky material in a molten state, the material containing a predetermined amount of a pressurized gaseous fluid to form a foamed hot melt material having a predetermined density and compressibility, applying an annular bead of the hot material in the molten state to said flat annular surface of the dispenser for bonding said bead thereto in position to engage said rim surface, said annular bead being applied in a controlled amount and at a controlled rate so as to be deposited as an undeformed bead of material, allowing the hot melt material to cool to room temperature to form an anti-slip gasket seal, providing a separate closure cap having an inwardly extending flange, engaging said inwardly and outwardly extending flanges for coupling said cap to said dispenser while permitting relative rotation of said cap to said dispenser about the central axis of said container, providing cooperating thread means acting between said cap and said container neck, and thread coupling the closure cap to the container neck to compress the cooled and tacky hot melt material against said rim surface such that the tacky hot melt material restricts movement of the dispenser about said central axis while remaining unadhered to said rim surface so as to avoid unthreading of said cap thereby sealing against leakage from between the rim surface and the dispenser.
2. A method of applying a manually operated dispenser to a container having a central axis and having a neck including a rim surface, the dispenser having an end wall presenting a flat annular surface for overlying the rim surface, and an outwardly extending flange on said end wall, the method comprising the steps of providing a quantity of hot melt, tacky material in a molten state, the material containing a predetermined amount of a pressurized gaseous fluid to form a foamed hot melt material having a predetermined density and compressibility, applying an annular bead of the hot material in the molten state to said flat annular surface of the dispenser for bonding said bead thereto in position to engage said rim surface, said annular bead being applied in a controlled amount and at a controlled rate so as to be deposited as an undeformed bead of material, allowing the hot melt material to cool to room temperature to form an anti-slip gasket seal, providing a separate closure cap having an inwardly extending flange, engaging said inwardly and outwardly extending flanges for coupling said cap to said dispenser while permitting relative rotation of said cap to said dispenser about the central axis of said container, providing cooperating thread means acting between said cap and said container neck, and thread coupling the closure cap to the container neck to compress the cooled hot melt material against said rim surface such that the tacky hot melt material bonds to said rim surface and restricts movement of the dispenser about said central axis, so as to avoid unthreading of said cap thereby preventing formation of a leak path between the rim surface and the dispenser.
3. The method according to Claim 1, wherein during said thread coupling, extruding the hot melt material into contact with the cap to restrict cap movement.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US537,233 | 1990-06-13 | ||
| US07/537,233 US5108524A (en) | 1990-06-13 | 1990-06-13 | Method of applying a manually operated dispenser to a container using a hot melt liner material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2041485A1 CA2041485A1 (en) | 1991-12-14 |
| CA2041485C true CA2041485C (en) | 1995-01-24 |
Family
ID=24141784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002041485A Expired - Fee Related CA2041485C (en) | 1990-06-13 | 1991-04-30 | Method of applying a manually operated dispenser to a container using a hot melt liner material |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5108524A (en) |
| EP (1) | EP0461771A3 (en) |
| JP (1) | JPH0557229A (en) |
| AU (1) | AU7633591A (en) |
| CA (1) | CA2041485C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5755269A (en) * | 1993-12-09 | 1998-05-26 | Ciba Corning Diagnostics Corp. | Fluid delivery system |
| GB2301634A (en) * | 1995-05-04 | 1996-12-11 | Hay Nien Company Limited | Spray bottle |
| US5669530A (en) * | 1995-08-18 | 1997-09-23 | Aptargroup, Inc. | Mounting systems accomodating a manually actuatable pump for fixed or variable dose operation |
| USD385492S (en) * | 1996-07-25 | 1997-10-28 | Contico International, Inc. | Trigger sprayer housing |
| MXPA02003659A (en) * | 1999-10-15 | 2003-05-23 | Siemens Canada Ltd | Method to create a hot melt form for use with an air induction assembly. |
| USD735051S1 (en) | 2013-11-15 | 2015-07-28 | S.C. Johnson & Son, Inc. | Combined sprayer shroud, bottle and belt clip |
| DE102015215043A1 (en) * | 2015-08-06 | 2017-02-09 | Henkel Ag & Co. Kgaa | Method for filling a bottle in a filling line |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5616734B2 (en) * | 1974-03-28 | 1981-04-17 | ||
| US4032492A (en) * | 1976-02-25 | 1977-06-28 | H. B. Fuller Company | Hot melt container closure sealant |
| US4256526A (en) * | 1977-08-10 | 1981-03-17 | Nordson Corporation | Method for applying a hot melt adhesive pattern to a moving substrate |
| US4295573A (en) * | 1979-12-21 | 1981-10-20 | Nordson Corporation | Method of obtaining a seal upon the interior surface of a container closure and resulting product |
| US4434917A (en) * | 1981-05-26 | 1984-03-06 | Yoshino Kogyosho Co., Ltd. | Trigger-actuated atomizer |
| US4592690A (en) * | 1982-10-08 | 1986-06-03 | Bonded Products, Inc. | Hot melt gasketing compositions and processes for applying them |
| US4756857A (en) * | 1985-07-18 | 1988-07-12 | Continental Plastic Containers, Inc. | Process of applying a top element to a container utilizing a hot melt material |
| ZA877005B (en) * | 1986-10-06 | 1988-03-23 | W.R. Grace & Co. | Plastic closure with shaped gasket |
| US4781773A (en) * | 1986-12-22 | 1988-11-01 | Instance David John | Manufacturing containers from multilayered material |
| US4917949A (en) * | 1987-01-27 | 1990-04-17 | Yousif Bahjat Z | Leakproofing cap liners and tamperproofing containers by induction heating |
| US4938390A (en) * | 1987-07-24 | 1990-07-03 | Markva Neil F | Liquid storage container with dispensing closure |
| JPH024657A (en) * | 1988-03-22 | 1990-01-09 | Nittetsu Drum Kk | Large sized container, its plastic plug and manufacture of plug |
| US4961796A (en) * | 1989-03-06 | 1990-10-09 | James River Corporation | System for bonding objects together |
| US4991731A (en) * | 1989-08-03 | 1991-02-12 | Abbott Laboratories/Ross Laboratories | Retortable composite closure for plastic containers |
-
1990
- 1990-06-13 US US07/537,233 patent/US5108524A/en not_active Expired - Lifetime
-
1991
- 1991-04-30 CA CA002041485A patent/CA2041485C/en not_active Expired - Fee Related
- 1991-05-02 AU AU76335/91A patent/AU7633591A/en not_active Abandoned
- 1991-05-21 EP EP19910304588 patent/EP0461771A3/en not_active Withdrawn
- 1991-05-31 JP JP3129638A patent/JPH0557229A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| EP0461771A3 (en) | 1992-08-05 |
| AU7633591A (en) | 1991-12-19 |
| JPH0557229A (en) | 1993-03-09 |
| US5108524A (en) | 1992-04-28 |
| CA2041485A1 (en) | 1991-12-14 |
| EP0461771A2 (en) | 1991-12-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |