U.S. patent number 3,917,100 [Application Number 05/482,417] was granted by the patent office on 1975-11-04 for closure with rotatable layered liner.
Invention is credited to Joseph Dukess.
United States Patent |
3,917,100 |
Dukess |
November 4, 1975 |
Closure with rotatable layered liner
Abstract
Material for cap liners in the form of a sandwich and so
arranged that a compressible intermediate layer of relatively great
thickness is disposed between two relatively thin non-resilient
layers. The intermediate layer can be squeezed beyond the periphery
of the material for making a better seal.
Inventors: |
Dukess; Joseph (Mamaroneck,
NY) |
Family
ID: |
26860744 |
Appl.
No.: |
05/482,417 |
Filed: |
June 24, 1974 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
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164658 |
Jul 21, 1971 |
3819460 |
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Current U.S.
Class: |
215/329; 215/350;
215/347 |
Current CPC
Class: |
B32B
27/32 (20130101); B65D 41/045 (20130101); B32B
27/08 (20130101); B32B 27/00 (20130101); B32B
27/065 (20130101); B32B 27/306 (20130101); B32B
2323/046 (20130101); B32B 2309/105 (20130101); B32B
2266/025 (20130101); B32B 2435/02 (20130101) |
Current International
Class: |
B32B
27/00 (20060101); B65D 41/04 (20060101); B65D
053/04 () |
Field of
Search: |
;215/329,347,350
;220/304 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Norton; Donald F.
Attorney, Agent or Firm: Goldfarb; Kenneth S.
Parent Case Text
REFERENCE TO RELATED APPLICATION
This application is a division of application Ser. No. 164,658,
filed July 21, 1971 for MATERIAL FOR CAP liner, now U.S. Pat. No.
3,819,460.
Claims
I claim:
1. A closure device comprising a cap having a top and an internally
threaded cylindrical side wall, said side wall having a groove
therein adjacent said top, a liner normally rotatably disposed in
said groove and including a disc having one outer layer and an
intermediate layer and bonded thereto, said outer layer being
relatively thin and non-resilient, said intermediate layer being
resilient and being compressible to form a lip extending beyond the
periphery of said outer layer and into engagement with said side
wall in said groove, said intermediate layer being relatively
thick.
2. A closure device according to claim 1, wherein said intermediate
layer is from 12 to 40 times the thickness of said outer layer.
3. A closure device according to claim 2, wherein said outer layer
is of a low density polyethylene, said intermediate layer being
engageable with said top and being of a thermoplastic rubberlike
material.
4. A closure device according to claim 3, wherein said intermediate
layer is of ethylene vinyl acetate copolymer.
5. A closure device according to claim 2, wherein said intermediate
layer is of foamed polyethylene.
Description
DESCRIPTION OF THE PRIOR ART
Various types of cap constructions utilizing liners have been
devised in the past. These liners are employed to seal the contents
of the container preventing leaking between the threaded portions
of a container neck and the cap by providing for a positive seal at
the mouth of the container. Such previous cap constructions and
liners and material used for liners therefor have been a compromise
between the requirement that the liner material be stress and crack
resistant while also being moisture impervious and impervious to
chemicals and acids, yet being bendable and comprssible enough to
provide for an effective seal. The present invention overcomes the
difficulties of the prior art liner material and has all of the
advantages of these prior materials without the corresponding
disadvantages. A further advantage of the liner according to the
present invention is that liners are capable of being stamped out
of stock liner material without freezing.
SUMMARY OF THE INVENTION
One of the features of the invention resides in liner material
capable of forming a liner that is freely rotatable within the cap
until such time as the mouth of the container is firmly against the
liner compressing the liner so that an intermediate layer of the
liner is compressed and expands outwardly thereby abutting against
the side walls of the cap for making a most effective seal.
A further object of the invention resides in the production of a
liner material that is capable of being extruded as a multi-layer
sandwich.
Still further, objects and feaatures of this invention resides in
the provision of a cap and liner therefor that is capable of being
extruded by conventional machinery and which can be conveniently
stamped to shape without requiring freezing thereby permitting
manufacture at a relatively low cost, and which is highly effective
in use.
These, together with the various ancillary objects and features of
this invention, which will become apparent as the following
description proceeds, are attained by this liner material, a
preferred embodiment of which is illustrated in the accompanying
drawing, by way of example only, wherein:
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is an exploded sectional detail view illustrating the cap
and liner therefor made from liner material according to the
invention;
FIG. 2 is a sectional detail view showing the cap liner therefor in
a stage of being secured on the neck of a container;
FIG. 3 is an enlarged vertical detail view illustrating a portion
of the cap and liner therefor as firmly secured on a container;
FIG. 4 is a partial sectional view of the liner material;
FIG. 5 is a view similar to FIG. 4 but showing the shape of the
liner after it has been compressed when the cap has been tightly
closed on the container;
FIG. 6 is a sectional view of a modification; and
FIG. 7 is a sectional detail view of a modified form of liner
material.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
With continuing reference to the accompanying drawing, wherein like
reference numerals designate similar parts throughout the various
views, reference numberal 10 is used to generally designate a
conventional container such as a bottle, tube, or can having a neck
12 which is threaded at 14. In order to provide a closure for the
container 10 a cap 16 is employed which includes cylindrical side
walls 18 which are internally threaded at 20 and a top 22. A
cylindrical groove 24 is formed as the uppermost of the threads 20
and is for the purpose of receiving therein a liner 26. The cap 16
is preferably molded out of any suitable synthetic plastic material
and is adapted to be threadedly secured on the neck 12 with the
threads 20 engaging the threads 14.
The liner 26, see FIG. 4, is from a liner material in accordance
with the invention formed of a sandwich of outer layers 28, and 30,
and an innerlayer 32, the liner 26 preferably being stamped in the
shape of a disc. The outer layers 28 and 30 are formed of a low
density polyethylene, such as that sold inder the trademark
"Alathion 20." This material is stress resistant, crack resistant,
relatively non-resilient, impervious and is extruded in a very thin
layer in the order of approximately 11/2 one-thousandths of an
inch. The intermediate layer 32 is a thermoplastic rubber like
material such as butylene in polyethylene known as pliothene, or
other resilient material such as ethylene vinyl acetate or the
material sold under the trademark Karton, which is a thermoplastic
rubber. Particularly, this material is resilient though not
necessarily as resistant to stress and cracks/or as impervious to
foreign substances as the material of the outer layers 28 and 30.
When the sandwich is manufactured by way of simultaneous multiple
extrusion, the outer layers 28 and 30 are extruded at a temperature
approximately 300.degree. to 400.degree.F while the intermediate
layer 32 is extruded at approximately 220.degree. to 320.degree.F.
The various layers are brought together within a combination dye
and at about 300.degree.F for bonding within the combination dye.
The resultant sheet material has a much increased resistance to
distortion or stress, can be stamped without freezing and is
impervious to chemicals and acids as well as moisture.
When the disc 26 is inserted in the groove 24 in a normal state it
will freely rotate therein permitting for effective setting of the
disc 26 within the groove 24 and effective engagement of the mouth
15 of the container 10 against the under surface 34 of the layer
30. Continued closure of the cap 16 will cause the resilient
intermediate layer 32 to be compressed exuding a tongue 36 beyond
the peripheral edges of the outer layers 28 and 30 and as shown in
FIG. 3 against the inner wall of the groove 24 frictionally sealing
the liner 26 with the cap 16. Thus, there is achieved an inner
effective seal and closure for the contents of the container 10
than heretofore possible to achieve while retaining all of the
desirable features of the non-resilient low density polyethylene
which is used for the outer layers, and which are relatively thin
so as to permit for an effectively resilient liner.
It has been found that for the liner material according to the
invention it is desirable that the intermediate layer 32 be between
12 to 30 times the normal width of each of the outer layers 28 and
30.
In FIGS. 6 and 7 there is shown a modified form of the invention
wherein a two-ply liner is used. The cap has its top 122 serve as
the upper outer liner, there being only an intermediate liner 132
and a lower outer liner 130.
In connection with the two ply liner, it has been found that the
intermediate layer may be made of a foamed polyethylene and may be
from 12 to 40 times the thickness of the outer layer. The use of
foamed polyethylene results in a saving of material. The foamed
polyethylene may be bonded by any suitable adhesive to the
undersurface of the top of the cap as desired.
A latitude of modification, substitution and change is intended in
the foregoing disclosure, and in some instances some features of
the invention will be employed without a corresponding use of other
features.
* * * * *