Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberCA2220626 A1
Publication typeApplication
Application numberCA 2220626
Publication date12 May 1998
Filing date7 Nov 1997
Priority date12 Nov 1996
Also published asDE69718876D1, DE69718876T2, EP0841258A2, EP0841258A3, EP0841258B1, US5927567, US6673295, US7041246, US20040036195
Publication numberCA 2220626, CA 2220626 A1, CA 2220626A1, CA-A1-2220626, CA2220626 A1, CA2220626A1
InventorsWilliam E. Fillmore
ApplicantWilliam E. Fillmore, Owens-Illinois Closure Inc.
Export CitationBiBTeX, EndNote, RefMan
External Links: CIPO, Espacenet
Dispensing closure and method of making
CA 2220626 A1
Abstract
A dispensing closure including a compression molded plastic closure having a base wall and a peripheral skirt having threads for engaging a container.
An opening is formed in the base wall and a compression molded liner is molded in situ in the closure and includes a radial liner forming portion on the inner surface of the base wall of the closure. An integral nozzle is compression molded with the liner and extends axially through the opening in the base wall. One or more slits in the nozzle define a dispensing opening through which the contents of the container can be dispensed by squeezing the container. In another form, the dispensing closure is provided with a liner such that a syringe needle is used to penetrate an elastomeric wall for removal of the liquid contents of the package.
Claims(43)
1.
A dispensing closure comprising a plastic closure having a base wall with an opening therethrough and a peripheral skirt, and a combined liner and nozzle compression molded on said plastic closure and defining a liner on the inner surface of said base wall and a nozzle at said opening.
2.
The dispensing closure set forth in claim 1 wherein said combined liner and nozzle are made of resilient plastic material.
3.
The dispensing closure set forth in claim 2 wherein said nozzle extends into said opening in said plastic closure.
4.

The dispensing closure set forth in claim 3. wherein said nozzle comprises an annular axial portion and a transverse portion.
5.
The dispensing closure set forth in claim 4 wherein said opening in said base wall of said plastic closure comprises an axial portion extending axially outwardly from said base wall, said annular portion of said nozzle being spaced radially inwardly of said axial portion.
6.
The dispensing closure set forth in claim 5 wherein said plastic closure has an annular shoulder at the juncture of the inner surface of the base wall and the inner surface of the peripheral skirt.
7.
The dispensing closure set forth in claim 6 wherein said liner includes an axial portion extending along the shoulder of said plastic closure.
8.
The dispensing closure set forth in claim 7 wherein said liner includes an annular bead engaging said plastic closure at the juncture of the axial portion defining the opening and the base wall of said plastic closure.
9.
The dispensing closure set forth in claim 8 including a removable cap having a base wall closing said opening and having an integral annular wall extending between said opening and said combined liner and nozzle.
10.
The dispensing closure set forth in claim 9 wherein said nozzle extends into said opening in said plastic closure.
11.
The dispensing closure set forth in claim 10 wherein said nozzle comprises an annular axial portion and a transverse portion.
12.
The dispensing closure set forth in claim 11 wherein said opening in said base wall of said plastic closure comprises an axial portion extending axially outwardly from said base wall, said annular portion of said nozzle being spaced radially inwardly of said axial portion.
13.
The dispensing closure set forth in claim 12 wherein said plastic closure has an annular shoulder at the juncture of the inner surface of the base wall and the inner surface of the peripheral skirt.
14.
The dispensing closure set forth in claim 13 wherein said liner includes an axial portion extending along the shoulder of said plastic closure.
15.
The dispensing closure set forth in claim 14 wherein said liner includes an annular bead engaging said plastic closure at the juncture of the axial portion defining the opening and the base wall of said plastic closure.
16.
A plastic closure comprising a compression molded plastic closure having a base wall with an opening therethrough and a peripheral skirt, said opening in said base wall of said plastic closure comprising an axial portion extending axially from said base wall.
17.
The closure set forth in claim 16 wherein said axial portion extends axially outwardly.
18.
The closure set forth in claim 17 wherein said plastic closure has an annular shoulder at the juncture of the inner surface of the base wall and the inner surface of the peripheral skirt.
19.
The closure set forth in claim 16 including a cap having a base wall covering said opening and having an integral annular wall connected to said axial wall by a weakened line.
20.
The closure set forth in claim 19 wherein integral annular wall engages the axial wall upon severing the cap, inverting the cap and placing the cap on the closure.
21.
The closure set forth in claim 17 wherein said opening in said base wall of said plastic closure comprises an axial portion extending axially outwardly from said base wall, said annular portion of said nozzle being spaced radially inwardly of said axial portion.
22.
A method of making a dispensing closure comprising compression molding a charge of molten plastic to form a plastic closure having a base wall and a peripheral skirt and forming an opening in said base wall of said plastic closure during the compression molding, and compression molding a combined liner and nozzle on said plastic closure.
23.
The method of making a dispensing closure set forth in claim 22 wherein said step of forming said opening in said base wall comprises forming an integral transverse cull on the base wall of the plastic closure during the compression molding of said plastic closure and thereafter severing said cull to form said opening.
24.
The method of making a dispensing closure set forth in claim 23 wherein said step of forming said opening comprises forming a thin integral web of plastic connecting said cull to said base wall of said closure.
25.
The method of making a dispensing closure set forth in claim 22 wherein the step of forming said combined liner and nozzle comprises forming said nozzle with a portion extending through said opening.
26.
The method of making a dispensing closure set forth in claim 25 wherein said compression molding said plastic closure comprises forming an axial projection defining said opening and said compression molding said combined liner and nozzle comprises engaging said axial projection to define a cavity for said nozzle during the compression molding.
27.
The method of making a dispensing closure set forth in claim 26 wherein said compression molding of said plastic closure comprises forming a shoulder at the juncture of the inner surface of said base wall and said peripheral skirt and engaging said shoulder with a forming tool to close the cavity during the compression molding of the combined liner and nozzle.
28.
The method set forth in claim 23 wherein said step of forming said cull comprises forming a disk across said opening.
29.
The method set forth in claim 28 wherein said step of forming said disk comprises forming a thin web of plastic at the juncture of said base wall and disk along which the disk may be severed.
30.
The method set forth in claim 23 wherein said step of forming said cull comprises forming a base wall and an integral wall integrally connected with said closure by a weakened line along which the cull is severed.
31.
The method set forth in claim 30 including forming said closure to a configuration such that it can be utilized as an overcap.
32.
The method of making a dispensing closure set forth in any one of claims 22-31 including forming at least one slit in said nozzle.
33.
The method of making a dispensing closure set forth in claim 32 wherein said forming at least one slit in said nozzle comprises engaging said dispensing closure, applying a force to the outer surface of said nozzle and moving a cutting tool axially against the inner surface of said nozzle to cut said slit.
34.
A method of making a closure comprising compression molding a charge of molten plastic to form a plastic closure having a base wall and a peripheral skirt and forming an opening in said base wall of said plastic closure during the compression molding, and compression molding a liner on said plastic closure.
35.
The method set forth in claim 34 wherein said step of forming said opening in said base wall comprises forming an integral transverse cull on the base wall of the plastic closure during the compression molding of said plastic closure and thereafter severing said cull to form said opening.
36.
The method set forth in claim 35 wherein said step of forming said opening comprises forming a thin integral web of plastic connecting said cull to said base wall of said closure.
37.
The method set forth in claim 25 wherein said compression molding said plastic closure comprises forming an axial projection defining said opening and thereafter compression molding a liner by engaging said axial projection to define a cavity for said liner during the compression molding.
38.
The method set forth in claim 37 wherein said compression molding of said plastic closure comprises forming a shoulder at the juncture of the inner surface of said base wall and said peripheral skirt and engaging said shoulder with a forming tool to close the cavity during the compression molding of the liner.
39.
The method set forth in claim 35 wherein said step of forming said cull comprises forming a disk across said opening.
40.
The method set forth in claim 39 wherein said step of forming said disk comprises forming a thin web of plastic at the juncture of said base wall and disk along which the disk may be severed.
41.
The method set forth in claim 35 wherein said step of forming said cull comprises forming a base wall and an integral wall integrally connected with said closure by a weakened line along which the cull is severed.
42.
The method set forth in claim 41 including forming said closure to a configuration such that it can be utilized as an overcap.
43.

The method set forth in any one of claims 34-42 including forming at least one slit in said liner.
Description  (OCR text may contain errors)

.

DISPENSING CLOSURE AND METHOD OF MAKING

This invention relates to dispensing closures and a method m~kinp such closures.

Back~round and Summ~ry of the Invention In dispensing closures, it is common to form a closure with an opening and insert a resilient nozzle in the closure. Such a closure requires the separate m~m)f~cture of each of these components as well as associated components for retainin~ the nozzle.
Among the objectives of the present invention are to provide a dispensing closure that requires only two components, namely, a closure and a combined liner and nozzle; which dispensing closure is made by compression molding a closure and thereafter compression molding a charge of plastic in the closure to form the combined closure, liner and nozzle; wherein the method involves a minimum number of steps; and wherein the control of the tolerances ofthe dispensing closure is made easier.

In accordance with the invention, the dispensing closure comprises a plastic closure having a base wall and a peripheral skirt is compression molded and has threads for eng~inP a container. A compression molded liner is formed in situ in the closure and includes a radial liner forming portion on the inner surface of S the base wall of the closure. An integral nozzle is compression molded with the liner and extends axially through the opening in the base wall. One or more slits in the nozzle define a dispensing opening through which the contents of the container can be dispensed by squeezing the container. The invention is also applicable to m~king a closure for a package wherein a syringe needle is used to 10 penetrate an elastomeric wall for removal of the liquid contents of the package.

~ CA 02220626 1997-11-07 Brief Descrigtion of the Drawin~
FIG. 1 is a perspective view of the dispensing closure embodying the invention.
FIG. 2 is a vertical sectional view of the dispensing closure.
S FIG. 3 is a top plan view of the dispensing closure.
FIG. 4 is a fr~Pm~nt~ry sectional view on an enlarged scale of the dispensing closure shown in FIG. 2.
FIG. S is a perspective view of the plastic closure portion of the dispensing closure.
FIG. 6 is a vertical sectional view of the plastic closure portion after it has been compression molded.
FIG. 7 is a top plan view of the plastic closure portion shown in FIG.
6.
FIG. 8 is a fragmentary sectional view on an enlarged scale of the plastic closure portion shown in FIG. 6.
FIG. 9 is an inverted view of the plastic closure portion after it has been compression molded.
FIG. 10 is a sectional view of an apparatus for trimming the cull formed in the plastic closure portion to form an opening through the plastic closure portion.
FIG. 11 is a sectional view of an apparatus for compression molding a charge of plastic in place in the plastic closure.
FIG. 12 is a sectional view of an apparatus for compression molding S the charge in the plastic closure to define a combined liner and nozzle in the plastic closure.
FIG. 13 is a sectional view of an apparatus for slitting the nozzle to define a dispensing closure.
FIG. 14 is an inverted view of a closure in a holder.
FIG. 15 is a sectional view of a modified form of an apparatus for trimming the cull from a plastic closure portion shown in Fig. 14.
FIG. 16 is a sectional view of a modified apparatus for molding a charge of plastic in place in the plastic closure.
FIG. 17 is a sectional view of a modified apparatus for 15 compression molding the charge shown in Fig. 16.
FIG. 18 is a sectional view of a modified form of apparatus for slitting the nozzle.
FIG. 19 is a sectional view of a modified form of closure before forming a liner therein.

FIG. 20 is a top plan view of the closure shown in Fig. 19.
FIG. 21 is a sectional exploded view of the closure after the top section is severed.
FIG. 22 is a sectional view of the closure with the liner S compression molded in the closure.
FIG. 23 is a sectional view of the closure and liner shown in Fig.
22 with the top section inverted and positioned to form a cap over the liner.
FIG. 24 is a sectional view of a modified form of closure and liner which includes a removable top section.

Description of the Preferred Embodiments Referring to FIGS. 1-4, in accordance with the invention, the dispensing closure 20 embodying the invention comprises a compression molded plastic closure 22 and a combined liner and nozzle 24 compression molded in place in the plastic closure 22. The plastic closure 22 comprises a base wall 26having an opening 28 therein and an integral peripheral skirt 30. The skirt 30 includes means on the inner surface thereof for eng~inP complementary means on a squeezable plastic container, the means herein shown comprising threads 32.Theplastic closure is made of plastic such as polypropylene. The combined liner and10 nozzle 24 is made of highly resilient elastomeric material.
The combined liner and nozzle comprises an ~nmll~r liner portion 34 eng~in~ the inner surface 36 of the base wall 26 of the plastic closure 22. The combined liner and nozzle 24 includes an integral nozzle portion 38 which extends axially through the opening 28 in spaced relation to a cylindrical ~nmll~r axial15 portion 40 which defines the opening in the plastic closure 22. Nozzle portion 38 includes an integral axial wall 42 extending from the liner portion 34 and an integral convex dome portion 44 having one or more slits 46 therethrough which open upon squeezing the container on which the dispensing closure 20 is positioned. As shown in FIG. 4, the liner portion 34 preferably includes an integral peripheral axial portion 48 extending along a short cylindrical portion 50 on a shoulder 52 at the juncture of the base wall 26 and skirt 30. In addition, the liner portion 34 preferably includes an integral ~nmll~r bead 54 on the upper surface thereof which engages a complementary surface at the juncture of the 5 axial portion 40 and base wall 26.
In accordance with the invention, the dispensing closure is made by first compression molding the closure 22 and thereafter compression molding the combined liner and dispensing nozzle 24 in the closure 22. In order to simplify the method of m~mlf~cture, the plastic closure 22 is formed with an integral disk 10or cull 60 connected to the base wall 26 by a thin ~nmll~r web 62 (FIGS. 5-8).
Referring to FIGS. 9 and 10, the disk 60 is removed by inverting the plastic closure 22 and placing it in a holder 64 which holds the plastic closure 22 in position for moving a cutting tool 66 having an ~nmll~r cutting edge 68 for severing the disk 60 and web 62 from the rem~in~ler of the closure 22.
15Referring to FIGS. 11 and 12, the plastic closure 22 is then placed in a holder 70 for receiving the closure 22 which includes a tool 72 extending into the axial portion 40 and defining a cavity 74 for receiving a charge of molten plastic P. A compression molding tool 76 is then moved axially into the apparatus 70 to compression mold the combined liner and nozzle 24. The periphery of the tool 76 engages the threads 32 on the closure 22 and the shoulder 52 to close the cavity 74. The end of the tool 76 is configured with an ~nmll~r surface 78 for forming the liner portion and an axial portion 80 for forming the nozzle portion.
Referring to FIG. 13, the dispensing closure is then placed in a holder 82 where 5 a base tool 84 contacts the nozzle portion and a cutting tool 86 is moved axially to cut one or more slits 46 in the nozzle portion.
In a prererred mode, as shown in Figs. 1~18, a single holder 100 is provided and after the closure 22 is compression molded, it is used as a holder for the compression molded closure in performing the successive steps of severing the 10 disc, compression molding the combined liner and nozzle 24 in the closure and forming the slits 46. Preferably, the holder 100 is one of a plurality of holders moved in an endless path, as by mounting on rotating turret which is moved past adjacent successive stations including a disc severing station; compression molding station for forming the liner and nozzle and a slitting station.
The compression molding is preferably by the method and apparatus described in United States patent application Serial No. 08/135,829 filed October 14, 1993 (OI 16662), and Serial No. 08/135,828 incorporated herein by reference filed October 14, 1993 (OI 16647).

Referlil.g to Figs. 13 and 18, the tool 84 and cutting tool 86 can be reversed such that the cutting tool 86a is moved upwardly rather than downwardlyand tool 84a is stationary.
In a modified form shown in Figs. 19-23, the closure 22a is molded S with top section 60a that comprises a base wall 102 and an integral wall 104 molded integrally with the cylindrical axial portion 40a. A weakened line 106 isformed and extends circumferentially at the juncture of the wall 102 and axial portion 40a. The top section 60a is severed from the closure 22a along weakened line 106 separating the wall 102 from axial wall portion 40a. The liner and nozzle 44a is compression molded as described above. The top section 60a can be inverted and used as a cap (Fig. 23) with the cylindrical wall 104 extending into the space between the axial wall portion 40a and the liner and the base wall 102eng~ing the upper wall 44a of the liner 24a.
In the modified form shown in Fig. 24, the dispensing closure 20b includes a plastic closure 22b which has a shortened axial wall portion 40b connected by a weakened line 106b to the cylindrical wall 104b of the top section 60b, such that upon severing by the user, the top section 60b it can be used as a removable cap.

Although the invention has been described as being directed to m~king a dispensing closure, it is also applicable to m~kin~ a closure for a package wherein a syringe needle is used to penetrate an elastomeric wall for removal ofthe liquid contents of the package.
S It can thus be seen that there has been provided a dispensing closure comprises a plastic closure having a base wall with an opening therethrough and a peripheral skirt having means such as threads for eng~in~ a container. A
compression molded liner is formed in situ in the closure and includes a radial liner forming portion on the inner surface of the base wall of the closure. An 10 integral nozzle is compression molded with the liner and extends axially through the opening in the base wall. One or more slits in the nozzle define a dispensing opening through which the contents of the container can be dispensed by squeezing the container. The invention is also applicable to m~king a closure for a package wherein a syringe needle is used to penetrate an elastomeric wall for removal of15 the liquid contents of the package.

Classifications
International ClassificationB65D51/00, B29C43/18, B29C43/42, B65D47/20, B29C70/76, B29C70/68
Cooperative ClassificationB29C70/683, B29C43/146, B65D47/2031, B29C70/766, B29C2793/0081, B29C43/18, B29C43/40, B29L2031/565, B29L2001/00, B29C43/00, B29C2043/148, B29C43/42, B65D51/002, B29C2793/0018
European ClassificationB29C43/40, B29C43/18, B29C70/68A4, B65D51/00B, B65D47/20E2, B29C70/76B, B29C43/42, B29C43/14C
Legal Events
DateCodeEventDescription
29 Sep 1999EEERExamination request
7 Nov 2006FZDEDead