U.S. patent number 3,924,771 [Application Number 05/417,554] was granted by the patent office on 1975-12-09 for bottle cap having a preshrunk foil portion.
Invention is credited to Gunther Cleff.
United States Patent |
3,924,771 |
Cleff |
December 9, 1975 |
**Please see images for:
( Certificate of Correction ) ** |
Bottle cap having a preshrunk foil portion
Abstract
A bottle cap containing a preshrunk wall of heat shrinkable
plastic foil prestretched in the direction of the circumference of
the tubular wall of the cap and capable of being readily mounted
upon and shrunk to final condition on a bottle to be capped, the
preshrunk tubular wall having longitudinal portions of different
residual shrinking capacity according to a predetermined
pattern.
Inventors: |
Cleff; Gunther (62 Wiesbaden,
DT) |
Family
ID: |
27249638 |
Appl.
No.: |
05/417,554 |
Filed: |
November 20, 1973 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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275252 |
Jul 26, 1972 |
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Foreign Application Priority Data
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Jul 30, 1971 [FR] |
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71.28012 |
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Current U.S.
Class: |
215/246; 215/253;
215/256; 215/355 |
Current CPC
Class: |
B65D
55/0854 (20130101) |
Current International
Class: |
B65D
55/08 (20060101); B65D 55/02 (20060101); B65D
045/32 () |
Field of
Search: |
;215/246,253,254,256
;53/41 ;156/84,85,86 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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1,088,552 |
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Oct 1967 |
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UK |
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821,626 |
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Aug 1937 |
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FR |
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69,938 |
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Oct 1958 |
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FR |
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Primary Examiner: Norton; Donald F.
Attorney, Agent or Firm: Strauch, Nolan, Neale, Nies &
Kurz
Parent Case Text
This is a continuation-in-part of pending application Ser. No.
275,252 filed July 26, 1972 for Bottle Cap Made Of Plastic Shrink
Foil, now abandoned.
Claims
What is claimed and desired to be secured by Letters Patent is:
1. A bottle cap for a bottle having a neck containing an orifice to
be closed by said cap comprising an encapsulating element of heat
shrinkable foil material that has been preshrunk in the form of a
thin tubular wall containing substantial residual shrinking
capacity and adapted for fitting with clearance over the outer side
of said bottle neck during initial assembly, said preshrunk tubular
wall having longitudinal portions of different residual shrinking
capacity according to a predetermined pattern.
2. A bottle cap as defined in claim 1 for a bottle wherein the
orifice is closed with a primary sealing fit by a substantially
non-shrinkable closure member, characterized by said encapsulating
element being connected at least around its upper part to said
closure member.
3. A bottle cap defined in claim 2 wherein said closure member and
said encapsulating element are affixed together prior to
installation of the cap on a bottle neck.
4. A bottle cap as defined in claim 2, characterized in that said
tubular wall is substantially frusto-conical and is fastened around
its smaller end to said closure member.
5. A bottle cap as defined claim 2, characterized in that said
tubular wall is made from a prestretched blank sheet of heat
shrinkable foil connected at opposite lateral edges for providing a
seam approximately parallel to the axis of said cap and preshrunk
into the desired tubular shape, the stretching direction of said
foil being around the periphery of the tubular wall.
6. A bottle cap as defined in claim 2, characterized in that said
closure member is shaped with a part for projecting beyond the
bottle orifice, and that the tubular wall of the encapsulating
element is fastened to said projecting part of the closure
member.
7. A bottle cap as defined in claim 6, characterized in that the
closure member is provided with an internal shoulder so dimensioned
as to fit over the bottle orifice.
8. A bottle cap as defined in claim 2, characterized in that said
closure member is fitted between a preshrunk flange and a preshrunk
bead of said encapsulating element.
9. A bottle cap as defined in claim 2, characterized in that a
score line essentially axial with respect to the encapsulating
element extends in said encapsulating element from the lower rim of
said tubular wall to approximately the connecting location of said
wall with said closure member.
10. A bottle cap as defined in claim 2, characterized in that said
encapsulating element is made from a prestretched blank cut from a
heat shrinkable foil sheet and solidly joined at two oppositely
located wall regions into an axial seam to form said tubular wall,
said foil being stretched only in the direction of the
circumference of said tubular wall, and an essentially axial score
line is provided laterally of said axial seam and extending to the
vicinity of the connection of the tubular wall to said closure
member.
11. A bottle cap as defined by claim 10, characterized in that the
axial perforated line is located adjacent the internal edge of said
encapsulation seam.
12. A bottle cap as defined in claim 1, characterized in that said
closure member comprises a stopper so dimensioned as to allow
introduction into the bottle neck orifice when the combination cap
is installed on the bottle.
13. A bottle cap as defined in claim 1, characterized in that the
closure member is so constructed as to project beyond the outer end
of the bottle orifice.
14. A bottle cap as defined in claim 13, characterized in that the
wall of said encapsulating element is fastened to the inside of the
closure member.
15. A bottle cap as defined in claim 14, characterized in that the
wall of the encapsulating element is fastened in the region of the
lower edge of the closure member.
16. A bottle cap as defined in claim 1, characterized in that the
encapsulating element is provided with two circular score lines
around the circumference of the tubular wall, said two score lines
bounding a tear-strip, and at least one gripping flap within the
two score lines.
17. A bottle cap as defined in claim 16, characterized in that the
tubular wall of the encapsulating element is made from a blank of
shrinkable foil connected at opposite edges to provide a seam
extending essentially parallel to the axis of the bottle cap and
forming thereby said tubular wall, said foil being stretched in one
direction and thereby being heat shrinkable only in that direction,
said one direction essentially extending around the circumference
of the tubular wall and said gripping flap being located adjacent
said seam.
18. A bottle cap as defined in claim 1, characterized in that two
parallel perforated lines are provided in said tubular wall of the
encapsulating element, said lines being parallel and extending
along the circumference of the tubular wall to thereby bound a tear
flap, and that a perforated line essentially axial with respect to
the tubular wall runs from the lower rim of said wall to the
peripheral perforated line facing said lower rim.
19. A bottle cap as defined in claim 1, characterized in that said
encapsulating element is made from a prestretched blank cut from a
heat shrinkable foil sheet and solidly joined at two oppositely
located wall regions into an axial seam to form said tubular wall,
said foil being stretched only in the direction of the
circumference of said tubular wall, and an essentially axial score
line is provided laterally of said axial seam.
Description
The invention relates to a bottle cap containing a controllably
preshrunk plastic foil portion that is to be shrunk to final
encapsulating condition when the cap is placed on a bottle to be
closed, and to methods of making the same.
Bottle caps made of plastic are relatively inexpensive and they can
be readily and simply applied on a bottle neck, so that they are
used more and more instead of metallic bottle caps.
Known bottle caps made of plastic shrink foil, however, have the
disadvantage that the caps, upon shrinking onto the bottle neck,
often pull up somewhat above the bottle neck and form an
undesirable mushroom-like projection above the bottle neck. This
phenomenon, on the one hand, has a poor effect on the appearance of
such capped bottles and, on the other hand, it reduces the hold of
the bottle cap on the bottle neck, so that bottle caps of this type
may readily fall off the bottle neck in the course of
transportation or storage.
The invention provides a bottle cap containing a plastic shrink
foil cap wall, which does not have the foregoing disadvantages and
which holds firmly and reliably on the bottle neck, as well as
being inexpensive to manufacture and process. In the invention the
cap wall is controllably preshrunk to attach it to the closure
member and at the same time condition it for efficient
encapsulation of the bottle neck when installed. While prior art
such as the British patent to Jowett No. 1,088,552 discloses a
bottle cap made of a closure member and a heat shrinkable cap wall,
the latter is not preshrunk and the cap is subject to many of the
objectionable features of the prior art bottle caps mentioned
above.
The invention provides as a further object a combination cap having
a non-shrinkable closure member adapted to be seated on the bottle
opening and a cap wall or skirt formed of a heat shrinkable foil
prestretched in only one direction, preferably with the stretch
direction oriented in the peripheral direction of the cap wall, and
the skirt is partially shrunk in a controlled manner whereby the
combination bottle cap can be finally applied and shrunk cleanly,
efficiently and without waste on the bottle neck.
In an advantageous form of the foregoing invention there are
axially disposed retaining ribs provided on the inner side of the
closure member permitting an exchange of the air enclosed by the
cap, so that air expanding during the final shrinking operation
will entail no damaging rise in internal pressure.
The foregoing combination cap is suited especially for bottles
which are to be closed with closure members such as stoppers or
corks that are introduced entirely or partly into the bottle neck,
for example, as in the case of wine bottle corks.
In the various embodiments of the invention there may be in the cap
wall or skirt a peripherally extending horizontal tear strip,
defined by two score lines along the periphery of the cap wall and
having at least one gripping tab preferably located in the region
of the longitudinal cap wall seam. In this connection it is
advantageous within the scope of the invention if there is formed a
score line which extends essentially in an axial direction with
reference to the cap from the free end of the cap wall on an
essential part of the length of the cap wall. In this way even the
lower part of the bottle cap can be removed from the neck of the
bottle without trouble.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a plan view showing a web of thermoplastic foil with the
prestretch direction indicated;
FIG. 2 is a plan view similar to FIG. 1 but showing cap wall or
skirt blanks cut from the web;
FIG. 3 is an elevation partly broken away and in section showing a
shaping plug or mandrel that seats the closure member and on which
the cap skirt or wall blank is placed prior to preshrinking;
FIG. 4 shows diagramatically the preshrinking operation;
FIG. 5 is an enlarged fragmentary view partly in section showing
the closure member and cap wall or skirt after preshrinking;
FIG. 6 is an elevation showing the combination cap as removed from
the shaping and preshrinking station;
FIGS. 6A and 6B illustrate relatively diagramatically a phase of
the invention wherein the cap is preshrunk in different
patterns;
FIG. 7 is an elevation showing in section a combination bottle cap
having a closure member in the form of a stopper;
FIG. 8 shows in section a bottle cap similar to that of FIG. 7 but
having a different stopper;
FIG. 9 shows in section a further embodiment of the bottle cap;
FIG. 10 shows in section a bottle cap having a gripping cork as the
closure member;
FIG. 11 shows in section a bottle cap having a champagne type cork
as the closure member;
FIG. 12 shows in section a bottle cap having a screw form closure
member;
FIG. 13 shows in section a bottle cap having a screw closure member
arranged on the lower edge zone thereof;
FIG. 14 shows in section a further embodiment wherein a bottle cap
is fixed on the inner side of a crown cork type closure member;
FIG. 15 shows in section a further embodiment wherein a bottle cap
is fixed to the inner side of a crown cork type closure member;
FIG. 16 shows in section a combination bottle cap of the invention
bottle closure according to a further embodiment;
FIG. 17 shows the combination preshrunk bottle cap according to
FIG. 16 when pressed onto a bottle neck before finally shrinking
the bottle cap wall; and
FIG. 18 shows the bottle cap of FIGS. 16 and 17 in the final
encapsulated condition closing the bottle neck opening when the
wall is finally shrunk upon the bottle neck.
PRESHRINKING
An essential feature of the invention is that when installed on a
bottle the bottle cap consists essentially of a bottle closure
member combined with a specially preshrunk foil of a heat
shrinkable plastic material forming the circumferential cap skirt
or side wall.
The cap is prepared prior to its assembly with the bottle to be
capped by mounting a blank cut from a prestretched thermoplastic
foil upon a special shaping plug or mandrel which also mounts the
closure member, and then subjecting the mounted blank to sufficient
heat to preshrink it into conformity with the plug and closure
member, and then removing the preshrunk cap from the plug for later
assembly with and final shrinking and encapsulation upon the bottle
neck to be capped.
Thus in the invention the foil material of the cap is subjected to
two stage shrinking. In the first stage it is mounted on the
shaping plug which controls and limits the degree and character of
shrinking while forming and shaping the cap for convenient assembly
with the bottle neck. After preshrinking the cap wall retains
residual shrinking capacity. In the second stage the preshrunk cap
is secured and further shrunk in final encapsulated condition on
the bottle neck.
During the preshrinking operation the application of shrinking heat
may be so controlled and distributed as to provide regions of
different residual shrinking capacity in the preshrunk cap wall.
This may take the form of a temperature gradient which may be
modified to provide a desired pattern suiting the preshrunk cap to
special bottle neck shapes.
This preshrinking feature will be diagramtically described in
connection with FIGS. 1-6, 6A and 6B which illustrate the various
steps in applying it to a combination cap wherein the foil is
preshrunk and secured to a bottle closure member.
FIG. 1 shows a web W of heat shrinkable thermoplastic foil that is
prestretched in the direction indicated by the arrows L. As shown
in FIG. 2 the web is severed into blanks B which may be of desired
shape. For example in this case it is desired that the cap skirt be
conical, and so the blanks are trapezoidal with the long and short
edges parallel to the direction of stretch.
A shaping mandrel or plug P is provided having a recess R. The
periphery of the plug P is conical, of the desired preliminary
shape and dimension for the cap skirt, and the recess freely
receives the stopper part of closure member C so that the head H of
the closure member will seat on the plug in proximity to the upper
edge of the plug periphery. As shown in FIG. 4 the upper edge of
the plug may have an external continuous groove G adjacent the head
of the closure member.
The foil blank B is now mounted on the plug, with the direction of
stretch extending circumferentially of the conical surface of the
plug and with the upper edge of the blank extending substantially
beyond groove G to about the upper edge of the cap head and
preferably a slight distance above. At this point the opposite
lateral edges of the blank are preferably secured adhesively in a
slight overlap seam.
Now preshrinking heat is applied, as by the instrument I shown in
FIG. 4. This is an electrically powered heater having a cavity
fitting over the shaping station which seats on a support. The foil
shrinks upon and about the closure member head H and plug P and, as
shown in FIG. 5, an annular region of the foil shrinks into groove
G to tightly bind the closure member and the foil skirt into a cap
unit. Now the combination cap which includes the closure member
which of course has not changed form or dimension and the
controllably preshrunk conical foil skirt or wall indicated at S in
FIG. 6 is removed from the preshrink station and is ready for
installation on the bottle to be capped.
The preshrunk caps may be used right away or stored until use is
desired. They may for example be placed in nested relation and fed
one at a time to bottle necks in automatic filling and capping
machines.
The shape and dimensions of the plug or mandrel P are such that the
open end of the preshrunk cap unit will fit easily and fairly
loosely over and upon the bottle neck while the closure member is
being firmly and finally seated in or around, in the case of a
threaded neck, the bottle neck opening. Once the closure member is
seated, the second stage of shrinking heat is applied whereby the
cap unit skirt shrinks to final encapsulating holding and sealing
condition around the bottle neck.
Control is exercised by using a preshrinking temperature which is
such that the initial stretched condition of the foil is only
partially recovered and that a substantial residual shrinking
capacity is retained in the thermoplastic foil material. When using
a relatively high preshrinking temperature the stretch condition of
the thermoplastic foil is mainly recovered and only a small
residual shrinking capacity is retained. When using a relatively
low preshrinking temperature only slight recovery of the
prestretched condition in the foil material is obtained, and there
is retained a relatively large residual shrinking capacity.
Therefore prestretching may be a measure to prepare different types
of bottle caps with respect to the retained residual prestretched
condition of the preshrunk foil. As can be seen from FIG. 6B
modification of prestretching may be performed so that the retained
residual shrinking capacity of the foil has a special desired
pattern. Such special pattern may be important to adapt the bottle
cap residual shrinking conditions to particular shapes of bottle
necks or the like. In the example of FIG. 6A the foil is uniformly
prestretched and there had been used a preshrinking temperature
having a gradient increasing toward the top. This means that in the
upper part of the bottle cap wall the used preshrinking temperature
is relatively low and at the lower part the preshrinking
temperature is relatively high. In the example of FIG. 6B the
pattern could be obtained by the preshrinking temperature having a
gradient toward the middle part of the bottle cap wall and in the
upper part providing a relatively constant and higher shrinking
temperature. Therefore in FIG. 6B the retained shrinking capacity
of the foil is relatively small at the upper bottle cap part but it
increases from the central part downward.
PREFERRED EMBODIMENTS
FIG. 7 illustrates a cap that consists essentially of an integral
plastic closure member 15 combined with a preshrunk foil cap wall
1. Closure member 15 may be of a conventional molded type made of
substantially non-shrinkable material such as polyethylene and it
is provided with a central cylindrical stem portion 2 adapted to
extend sealingly into the mouth of the bottle to be sealed and an
outwardly disposed rim 20 adapted to seat upon or surround the
upper edge of the bottle mouth. Member 15 is to be the primary seal
when the cap is installed on the bottle, and the final seal and
increased holding of the closure member are obtained when the
preshrunk wall 1 of the installed cap is further shrunk to
encapsulated final condition around the bottle neck. Wall 1 may be
a blank of heat shrinkable material such as polystyrene or
polyvinylchloride foil wrapped around the shaping plug with its
opposite edges overlapped in a seam at 19 and usually adhesively
secured prior to the preshrink operation. When the cap is
eventually installed on a bottle the upper end of the bottle neck
will be enclosed in the channel 21 between rim 20 and projection 1
when the rim surrounds the bottle neck. Stem 2 may be formed with
one or more external ribs 18 for good friction fit within the
bottle neck.
The cap of FIG. 7 is made by the method and apparatus above
described, closure member 15 being mounted on a suitable shaping
plug or mandrel and a suitable blank of heat shrinkable plastic
foil being wrapped around the combined plug and closure member for
preshrinking to the condition shown in FIG. 7. After the
preshrinking operation is complete it is preferable to adhesively
secure a circular wafer 7 of plastic material over the upper end of
the cap, this wafer providing a smooth finished appearance and it
may bear printing decoration, or the like.
As shown in FIG. 7 a tear strip 9 is provided in the preshrunk cap
wall by parallel score lines 10 and 11 extending around the wall,
cuts being formed to provide an end tab 17 by which the tear strip
may be pulled. Tab 17 may be of any desired shape, triangular,
U-shaped or even I-shaped for tearing in opposite directions. Also
from the lower edge of cap wall 1 extends a longitudinal score line
12 at right angles to the tear strip. Advantageously score line 12
is located adjacent and parallel to the overlap seam 19 formed by
the opposite edges of the blank wrapped around the shaping plug. In
the lower edge of wall 1 a recess 13 is formed for easy starting
access to the end of score line 12.
As shown in FIG. 7 it may be preferable to form in the upper part
of wall 1 just below closure member rim 21 an annular series of
depressions 120 that internally provide bottle surface engaging
projections. These depressions are usually formed by heated tools
after the preshrink operation and before removing the combination
cap from the shaping plug.
FIGS. 8 and 9 show caps comprising the forms of closure members 15
each combined similarly with a preshrunk wall or skirt 1. In these
embodiments the shaping plug may be formed with an annular groove
as at G in FIG. 5 whereby an internally projecting annular bead 130
is provided in the preshrunk wall for engagement with the outer
surface of the bottle neck.
It should be understood that in the embodiment shown in FIG. 8 an
internally projecting annular bead 130 may be provided instead of
the annular series of depressions 120.
In each of the FIG. 7-9 embodiments the closure member is closed,
preferably integrally, across its upper end and the stem 2 has
friction tight surface fit within the bottle neck opening. The
preshrunk wall 1 attaches itself to the closure member during the
preshrink operation and its lower end and circumferential
dimensions are such that the cap may be readily placed over the
open neck of a bottle to be capped and the closure member forced or
screwed into final assembly with the bottle prior to the final
shrink operation when the preshrunk wall 1 subjected to a heating
operation that shrinks it into tight encapsulated conformation with
the bottle neck.
FIGS. 10 and 11 illustrate commercially available closure members
of the champagne cork type where the stem 2 may be a cork element
fixed to a relatively rigid head.
FIGS. 12-15 illustrate the cap as comprising closure members 16
that close the bottle mouth from the outside, rather than by the
friction fit stem 2 shown in FIGS. 7-11. In each of these the wall
1 of shrinkable foil is secured to the closure member during a
preshrinking operation as described, and as shown in FIG. 12 an
internal annular bead 140 may be formed either during preshrinking
or by a later applied hot tool.
In FIGS. 12 and 13 the closure member is of the screw thread type
preferably made of sheet metal, the cap wall 1 being preshrunken
onto the outside of said closure member while in FIGS. 14 and 15
the closure member is of the crown type and the upper edge of wall
1 is fixed preferably adhesively secured to the inside of the
closure member and clamped between the skirt of the closure member
and the shaping plug during the preshrink operation.
As shown in FIGS. 16-18 the bottle cap wall 1 is made of shrinkable
thermoplastic foil material. The bottle cap is prepared in the
manner above described and consists essentially of the closure
member 100 and the attached preshrunk wall 1. The closure member
100 is formed as by molding of thermoplastic material with inherent
resilience, and it has a circumferential radially directed rim 101
which is downwardly crimped around its outer edge. Within the rim
101 closure member 100 contains a depressed portion 105 intended to
be frictionally introduced into the mouth opening of the bottle
(see FIGS. 17 and 18) to effect primary seal under somewhat radial
compression.
To make this bottle cap according to a preferred embodiment of the
invention the closure member 100 is inserted into the recess of a
suitable shaping plug and then a blank of stretched thermoplastic
foil is wrapped around the shaping plug and closed at an axial
overlapping seam 19 as by adhesive. Thereafter the thermoplastic
blank so closed around the shaping plug and closure member is
preshrunk. By such preshrinking a circumferential inwardly directed
bead 102 may be formed directly beneath the outer marginal part of
the closure member rim 101. At the same time the upper rim portion
of the closed blank extending upwardly beyond the closure member
rim portion 101 is shrunk as a circumferential radially extending
flange 103 over the rim 101 of closure member 100. Thereby the
closure member is axially held at its rim portion 101 between the
flange 103 and the bead 102 of the cap wall 1. After preshrinking a
circular decorative sheet 104 made of metallic or plastic foil may
be sealed onto the flange 103 of the cap wall 1. Finally two lines
of perforations 10 and 11 and a fully cut out tab 17 are prepared
in the bottle cap wall 1. After this is done the finished bottle
cap is removed from the shaping plug.
In FIG. 17 the combination bottle cap of FIG. 16 is shown as
pressed axially onto the neck 110 of a small champagne bottle
containing about 0.2 liter champagne. When pressing axially down
into the mouth opening the middle portion 105 of the closure member
100 is radially compressed and forms a fluid tight primary seal.
When the combination bottle cap 1 is pressed onto the bottle neck
110 the circumferential bead 102 may be deformed outwardly as shown
in FIG. 17 but this offers no problem because immediately after
pressing on the bottle neck the cap wall 1 is finally shrunk so as
to conform with the outer surface of the bottle neck 110 as shown
in FIG. 18. Thereby the cap wall 1 is securely held against any
axial movement with respect to the bottle neck 110, and also the
bottle closure member 100 is held in closed condition by the bottle
wall flange portion 103 overlying the rim 101 of the closure member
100.
In all its phases when installed on a bottle the invention as
installed on a bottle contains a bottle cap of a non-shrinkable
closure member with an attached novel shrinkable encapsulating
element that during installation fits with clearance over the
bottle neck. In practice the closure member is fitted to the bottle
orifice as a primary seal and then the preshrunk encapsulating wall
portion is heat shrunk to final assembly on the bottle neck. This
combination induces mutual effects. The encapsulating element
provides decoration, but it is also functional when installed in
the sense of aiding in maintaining the closure element in the
position of closing the bottle orifice. Mutual fixation and
preshrinking of the encapsulating element results in the sealing
and encapsulating elements forming one cap unit even if they should
be of different materials.
The encapsulating element is precisely centered in installation by
the closure member to which it is secured, and it is prevented from
axially slipping upwards over the bottle orifice when heat shrunk
upon the bottle neck.
The bottle cap of the invention is of special significance for
those bottles in which there is or may be generated internal
pressure. When shrunk upon the bottle, the encapsulating element in
tubular wall form and solidly connected to the closure member will
so tightly maintain the bottle cap upon the bottle orifice that
even for high internal pressures, the closure member will be
maintained reliably in the sealing position. This feature is
especially applicable to plastic bottles which may be easily
compressed at their side walls to cause a corresponding hydraulic
pressure from the liquid inside against the bottle cap. However,
the cap will be maintained in its closing position by virtue of the
encapsulating element being shrunk tight against the outer side of
the bottle neck. An additional feature is provided as regards
plastic bottles, namely that the foil shrunk upon the bottle neck
causes an appreciable stiffening of the bottle neck, so that a
plastic bottle neck will be clamped firmly due to between the
closure member reaching into the bottle neck and the surrounding
encapsulating element.
The invention may be embodied in other specific forms without
departing from the spirit or essential characteristics thereof. The
present embodiments are therefore to be considered in all respects
as illustrative and not restrictive, the scope of the invention
being indicated by the appended claims rather than by the foregoing
description, and all changes which come within the meaning and
range of equivalency of the claims are therefore intended to be
embraced therein.
* * * * *