[0001] The invention relates to a closure for a container, especially a bottle, comprising
an upper covering panel and a circumferential collar or skirt adjoining the covering
panel on the outside, wherein a sealing insert or liner is arranged on the underside
of the covering panel which has a circumferential profile seal along the outside periphery.
Such a closure is also known as (closure) lid or (closure) cap. The closure within
the scope of the invention is a "non re-usable" closure, especially a bottle closure
which can be constructed for example as a crown cork closure or a tear-off closure.
In both cases, the upper covering panel of the closure incorporating the profile seal
is pressed against the bottle top at the sealing of the closure on the bottle. The
circumferential band or collar which forms a cylindrical closure skirt, embraces the
bottle neck bead after sealing and the lower part of the skirt provides a firm grip
under the bead ring. In the embodiment as a crown cork closure, the skirt is provided
with the usual crown cork stamping or teeth with the corrugations pressed against
and slightly in under the bead ring, giving the appropriate grip. In the case of a
tear-off container closure, the skirt is crimped in under the bead ring and a tear-off
strip is provided, which is defined by score lines in the covering panel and the skirt
wherein this tear-off strip continues as a tongue protruding beyond the skirt and
a pulling member, e.g. a pull-ring, is connected to this tongue.
[0002] Bottle closures are known in a wide range of embodiments both as crown-cork closures
and as tear-off closures. A constant problem is the handling of carbonated liquids
in bottles. In order to ensure a high and constant quality of carbonated beverage
for example, the bottles must be securely closed with the provided closures eliminating
leakage of carbonisation. In this case, there is the problem that considerable internal
pressures can occur in bottles filled with carbonated liquids. Such high internal
pressures can especially occur when the filled and closed bottles are exposed to high
temperatures and/or violent movements, e.g. during transport. Considerable problems
can arise therefrom since at such high pressures there is the risk that the bottles,
whether these are made of glass or plastic, will explode or burst. A considerable
risk of injury is associated therewith for the user or neighbouring third parties.
[0003] The same applies if in the case of a crown cork closure for example, the crown cork
is caused fiercely leaving the bottle top by such a high inner pressure. For the manufacturers
of bottle closures and for the beverage manufacturers or bottlers, such risks are
already barely acceptable because of the risk of any liability associated therewith.
However, in spite of this it must be taken into account that the filled and closed
bottles must easily be able to withstand pressures of 6 bar without any significant
pressure loss since beverages are exposed to such pressures for example during pasteurisation
processes. For this reason crown corks and other closures are constructed to stay
firmly on the bottle top at inner pressures below 10 bar.
[0004] Basically, there is thus a need to create bottle closures which minimise the problems
explained and make it possible for pressure to be released via the closure at such
high internal pressures. In this connection, it is known to use seals made of particularly
resilient PVC or the like wherein these soft-elastic PVC seals make it possible to
release pressure at high pressures. For various reasons however, PVC should no longer
be used as a sealing material for foodstuffs, especially beverages. However, the PVC-free
sealing materials having a fairly high molecular density used in practice have the
disadvantage that they are less elastic or resilient and cannot ensure a release of
pressure at such high inner pressure and "resealing" during a subsequent drop in pressure.
[0005] Already 1956 the need for releasing pressure for bottles sealed with crown corks
was recognized. Special liner configurations made of soft-elastic sealing materials
was combined with closures made of resilient metal, making the upper covering panel
bulging or booming (see US 2 739 724).
[0006] In tear-off container closures it is known to render possible a release of pressure
in the case of carbonated beverages by arranging a type of pressure-release valve
in the region of the tear-off strip or the connecting section or pulling member connected
thereto, in which the adhesion or grip of the cap skirt to the bottle is reduced in
this region (see DE 37 37 467 A1). Such measures have basically proved effective.
However, they are depending on soft-elastic linear materials like PVC, and are not
applicable to other types of closure, such as crown cork closures for example.
[0007] The object of the invention is to provide a closure for a container, especially a
bottle closure, which can not only be used universally on conventional bottle neck
beads and is simple and cheap to manufacture and seal but in addition, on reaching
a predicted inner pressure makes it possible to achieve a specific release of pressure
and subsequent problem-free reclosure.
[0008] In order to solve this problem, in a generic closure for a container, especially
a bottle, the invention defines and instructs that the upper covering panel has on
its underside (facing the sealing insert) at least one projection, e.g. embossing,
extending at least over a predefined angular region, which projects in the area of
or close to the profile seal and interacts therewith forming a venting valve. According
to the invention the upper covering panel has on its underside an annular sealing
liner located peripherally with an outer protrusion adjoined inside with a lower and
wider ring, in combination, constituting a liner configuration ("profile seal") being
designed to interact with a defined embossing, stamping or shaping of the upper covering
panel, thereby forming a venting valve.
[0009] In this case, the invention starts from the knowledge verified by experiments that
the function of the seal can be specifically influenced if the covering panel is provided
with an underside projection, e.g. embossing, stamping, moulding in connection with
the area of the profile seal and constructed to interact with the profile seal. By
selecting a suitable combination between the profile seal and the embossing, a closure
can thus be provided which allows a release of pressure at a predetermined inner pressure
of 7 bar to 10 bar, for example and after a predetermined reduction in pressure of
2 bar for example, automatically seals again. The risks for injuries and associated
liabilities described initially can thus be eliminated in a simple and cheap fashion
without any need to accept loss of quality in the filled beverages. Position, shape,
height and width of the embossing are to be combined in such a way that the closure
starts to release pressure at a predetermined inner pressure level and that a problem-free
reclosure or re-sealing takes place at a predetermined reduction in pressure. In this
case, the solution according to the invention functions in the same way in tear-off
closures as in crown cork closures. The performance of the closure is not influenced,
for example, by score lines provided with tear-off closures. There is no need to adapt
the bottles, the conventional standard bottle necks of crown cork type can be used.
This is valid for all known bottle neck standards including the European, the American
(GPI), the Japanese and similar, all having slightly different neck profile or configuration.
The bottles can be made of glass or plastic. "Profile seal" means a seal with a "step-like"
cross section.
[0010] In a preferred embodiment, the profile seal is constructed as substantially L-shaped
in cross-section with an outer first (lip-type) sealing ring and an inner second (flat)
sealing ring or sealing surface, wherein the outer sealing ring has a greater height
and/or a smaller width than the inner sealing ring. In this case, the invention starts
from the knowledge that such a profile seal in interaction with the projection or
embossing according to the invention makes it possible to achieve a particularly specific
and above all reproducible release of pressure.
[0011] The seals known from practice having a substantially C-shaped liner cross section
comprising a high outer lip-type sealing ring, a low and rather flat middle sealing
surface and a high lip-type inner sealing ring do not provide any specific release
of pressure below 10 bar. Of particular importance here is that there is no longer
any need to accept any bulging or even lifting of the closure covering panel as the
profile seal together with the embossing form a degassing or venting valve, which
operates without any bulging or lifting of the upper covering panel.
[0012] According to a first embodiment of the invention, the projection or embossing is
constructed as a circumferential step with a side descending steeply downwards, forming
for example a lower central plate of the covering panel. This step can, for example,
be constructed as a completely circumferential step with completely identical radius,
forming a circular cap central region when viewed from above. It is to be understood
that the step itself is located radially to interact with the profile seal, forming
a valve. The desired venting effect can be adjusted by tuning the various parameters.
In a modified embodiment the circumferential step can have a plurality of step sections
with different radii which each extend over a predetermined angular region. It is
thus possible that the step is arranged over a predetermined circumferential region
in such a radius which fulfils a stronger venting valve function together with the
profile seal whilst the other regions of the step are arranged on a different radius
which merely possess a small valve-forming function. Thus, the desired pressure release
or venting effect can be further specified by selecting the corresponding circumferential
regions.
[0013] The radius of the step or at least of a step section can be smaller than or equal
to or slightly greater than the outer radius of the profile seal and/or greater than
or equal to or slightly smaller than the inner radius of the profile seal, thus including
that the radius of the step can be of any size greater than the inner radius of the
inner sealing ring up to the outer radius of the outer sealing ring. In addition the
venting valve constituted by the interaction between the profile seal and the embossing
possibly can be given a form extending to a radius greater than the outer radius of
the profile seal or smaller than the inner radius of the profile seal. However the
step or step section is close enough to the profile seal to interact with the sealing
ring or the sealing rings and thereby to influence the sealing properties of the profile
seal.
[0014] The side angle of the step or of a step section with respect to the horizontal or
with respect to the upper covering panel is for example 40° to 90°, e.g. 60° to 80°.
Here also the choice of angle offers a sensitive parameter for setting the desired
venting function. By means of a steep angle of approximately 90°, e.g. 80°, the seal
can be especially strongly influenced and thus a stronger venting valve effect can
be achieved. However, it is also possible to work with flat angles of 10° to 40°.
[0015] In another embodiment, the projection or embossing is constructed not as a (single)
step but as a groove or channel of predetermined width and height, which runs around
or extends over a predetermined angular region, with an outer side descending towards
the centre of the cap and an inner side ascending towards the centre of the cap. The
ascending inner side can directly adjoin the descending outer side. However, it is
also possible to provide an, as it were, flat base region between the sides. The groove
can be constructed as a circular-ring-shaped, completely circumferential groove viewed
from above, which extends over the total area of the cap and thus over a full angle
of 360°. However, it is also possible to provide a plurality of grooves or groove
sections which each extend merely over a limited predetermined angular region. In
embodiments with pluralities of grooves or groove sections all grooves can be arranged
on the same radius. However, it is also possible for the grooves or groove sections
to be arranged at least partly on different radii. The grooves or groove sections
are embossed into the upper covering panel during manufacture of the closure. However,
the invention also comprises embodiments in which the projection is constructed as
a protrusion connected to or moulded onto the underside of the upper covering panel.
The possible configurations described in connection with the groove equally exist
here. However, the embodiment with embossed groove(s) or step(s) are all distinguished
by their particularly simple manufacture.
[0016] In the embodiments with circumferential or partly circumferential grooves or protusions,
there are numerous possibilities for influencing the valve-forming effect by setting
the desired parameters. Thus, the angle of inclination of the descending side with
respect to the horizontal and/or the angle of inclination of the ascending side with
respect to the horizontal can be 40° to 90°, e.g. 60° to 80°. The angle(s) of inclination
can also be 5° to 40°, e.g. 10° to 40°. The groove or the protrusion can be constructed
symmetrically or asymmetrically, i.e., with identical or unequal angles of inclination.
Thus, it can be appropriate if the outer side is constructed as a steep side and the
inner side is constructed as a flat side or vice versa. Also by selecting suitable
radii of the grooves or groove sections relative to the profile seal, the desired
degassing effects can be sensitively influenced. Thus, the invention proposes that
the outer radius and/or inner radius of the groove or at least one groove section
is smaller than or equal to the outer radius of the profile seal and/or greater than
or equal to the inner radius of the profile seal. The grooves or groove sections are
thus arranged at least partly in the area of the profile seal. They can be arranged
completely in the area of the outer sealing ring or also completely in the area of
the inner sealing ring. Furthermore, the groove or a groove section can also extend
from the area of the outer sealing ring into the area of the inner sealing ring. Moreover
it is possible that the inner radius and/or the outer radius of the groove is slightly
smaller than the inner radius of the profile seal or that the outer radius and/or
the inner radius of the groove is slightly greater than the outer radius of the profile
seal. However the groove or at least one groove section must be close enough to the
profile seal to interact with the profile seal and thereby to influence the sealing
properties of the profile seal.
[0017] The width of the groove is preferably 1 mm to 4 mm, e.g. 1 mm to 3 mm. The height
of the groove or step can be 0.1 mm to 0.8 mm, e.g. 0.2 mm to 0.6 mm.
[0018] The covering panel forming the closure together with the skirt or collar connected
thereto are made, according to the invention, of metal, e.g. of tin plate, aluminium
or tin-free steel as well as suitable alloys thereof and other metals. The sealing
insert or liner assigned to the underside of the covering panel is preferably manufactured
in one piece and made of plastic. The sealing insert or liner is preferably made of
polyethylene (PE) e.g. of low molecular density PE (LDPE) or modification thereof,
with or without a scavenger agent. In any case, a PVC-free plastic is preferably used.
[0019] The thickness of the (metal) closure shell (covering panel and skirt) is 0.15 mm
to 0.25 mm, e.g. 0.17 mm to 0.24 mm, preferably 0.17 mm to 0.21 mm. As already explained,
the closure can be constructed as a tear-off closure or as a bend-off closure type
crown cork. The diameter of the closure is around 18 mm to 45 mm. Crown cork closures
are usually manufactured with a diameter of 26 mm to 27 mm. The sealing insert within
the scope of the invention is preferably constructed as a full-area liner having a
circumferential profile seal on the outside and a low central region which itself
has no sealing function. Such liners are preferably formed by compression moulding
directly into the prefabricated closure which already has the embossing, and moulded
onto the underside of the upper covering panel. However, it is also possible for the
sealing insert to be fabricated in a separate production step, for example, by being
stamped out of an extruded plastic sheet and then affixed, e.g. glued, to the underside
of the upper covering panel.
[0020] The invention is explained in detail subsequently with reference to the drawings
which merely show exemplary embodiments. In the figures:
- Fig. 1
- shows a bottle closure in the embodiment as a tear-off closure,
- Fig. 2
- shows a bottle closure in the embodiment as a crown cork closure,
- Fig. 3,3a
- shows a tear-off closure in plan view and in a section A-A through the subject matter
from Fig. 3,
- Fig. 4,4a,4b
- shows a tear-off closure in a modified embodiment in a plan view and in a section
A-A, as well as a section B-B,
- Fig. 5,5a,5b
- shows a tear-off closure in a modified embodiment in a plan view and in a section
A-A, as well as a section B-B,
- Fig. 6,6a,6b
- shows a tear-off closure in a modified embodiment in a plan view and in a section
A-A, as well as a section B-B,
- Fig. 7,7a
- shows a tear-off closure in another embodiment in a plan view and in a section A-A,
- Fig. 8,8a
- shows a tear-off closure in another embodiment in a plan view and in a section A-A,
- Fig. 9,9a
- shows a tear-off closure in another embodiment in a plan view and in a section A-A,
- Fig. 10,10a
- shows a tear-off closure in another modified embodiment in a plan view and in a section
A-A,
- Fig. 11,11a,11b
- shows a tear-off closure in a plan view and in a section A-A, as well as a section
B-B,
- Fig. 12,12a,12b
- shows a tear-off closure in a plan view and in a section A-A, as well as a section
B-B,
- Fig.13,13a,13b
- shows sections of further embodiments of the invention.
- Fig.14,14a,14b
- shows a tear-off closure in another embodiment in a plan view, in a section A-A and
a section B-B,
- Fig. 15,15a
- shows a container closure according to the invention in the embodiment as a crown
cork closure in plan view and in a section A-A,
- Fig.16,16a,16b
- shows a crown cork closure in a modified embodiment in plan view and in a section
A-A and a section B-B,
- Fig. 17,17a
- shows a crown cork closure in another embodiment in plan view and in a section A-A,
- Fig. 18,18a
- shows a crown cork closure in another embodiment in plan view and in a section A-A,
- Fig. 19,19a
- shows a crown cork closure in another embodiment in plan view and in a section A-A,
- Fig. 20,20a
- shows the subject matter from Fig. 6 or 6a during sealing,
- Fig. 21,21a
- shows the subject matter from Fig. 19 or 19a during sealing.
[0021] The figures show closures for bottles or other container openings. Figure 1 shows
the basic structure of a bottle closure in the embodiment as a tear-off closure. The
closure consists of an upper, round covering panel 1 adjoining which on the outside
is a substantially cylindrical collar or skirt 2 which embraces the bottle neck 3
in the course of sealing and grips under a bead 4 or a flange of the bottle neck.
On the underside of the covering panel 1 is a sealing liner 5 (which cannot be seen
in Fig. 1) which has a circumferential profile seal 6 on the outer circumferential
side. It can also be seen in Fig. 1 that the tear-off closure has a tear-off opening
strip 7 with a tongue 8 projecting from the cap skirt 2, wherein the tear-off strip
is defined by score lines 9, 9' arranged in the closure. The score lines on both sides
are normally of the same length, but can vary from half length 9' to full length 9.The
tongue 8 is connected to a pulling member 10. Different embodiments of such a tear-off
closure according to the invention are shown in Figs. 3 to 14.
[0022] In contrast, Fig. 2 shows a bottle closure in the embodiment as a crown cork closure
wherein the circumferential skirt 2 is here provided with the usual embossed corrugations
or teeth 11. Different embodiments of such a crown cork closure according to the invention
are shown in Figs. 15 to 19.
[0023] According to the invention, the upper covering panel 1 has one or a plurality of
at least partly circumferential projections 12, 12a, 12b, 13, 13a, 13b on its underside
facing the sealing insert 5, which are made of embossings and interact with the profile
seal 6 forming a venting valve and for this purpose project or protrude into the area
of the profile seal 6. These embossings are not shown in Figs. 1 and 2. The profile
seal is constructed as a substantially L-shaped cross-section with an outer first
sealing ring 6a and an inner second sealing ring or surface 6b, wherein the outer
sealing ring 6a has a larger height and a smaller width than the inner sealing ring
6b.
[0024] In the embodiments according to Figs. 3 to 7, and 15 to 17 the projections or embossings
are constructed as circumferential steps 12, 12a or 12b having a descending side 14
towards the centre M of the cap. In this way, a pressed down cap central region 15
is created in the area of the cap centre so that overall a lower central panel 15
is provided. A comparative examination of Figs. 3 and 15, for example, clearly shows
that the embossing according to the invention can be identically provided both for
tear-off closures and for crown cork closures. Its functioning principle is not influenced
by the score lines provided with the tear-off closures.
[0025] Whereas the step 12 in the embodiments according to Figs. 3 or 15 runs around or
extends completely over a full angle of 360°, Fig. 4, 5 and 6 for example show embodiments
in which a plurality of step sections 12a, 12b with different radii R, R' are provided.
According to Fig. 4, 5, 6 the step sections 12a, 12b each extend over a predetermined
angular range δ or δ'or δ". The radius R, R' of the step here means the upper radius,
that is the radius in the area of the upper edge of the step.
[0026] According to Fig. 4, two circumferential steps 12a are provided, each running around
over an angle δ of approximately 150° and giving a reduced venting effect, said steps
having a radius R which substantially corresponds to the inner radius P
i of the profile seal 6. Arranged diametrically opposite between these two steps 12a
are valve-forming step sections 12b whose radius R' is configured such that the step
12b is arranged substantially in the area of the outer sealing ring 6a. In this case,
the two valve-forming step sections are provided with different lengths, that is they
cover different angular regions δ' or δ". The same applies to the embodiment in Fig.
16 in which four valve-forming step sections 12b are provided, that extends over different
angular regions.
[0027] According to Figs. 5 and 6 one step section 12a runs over an angle δ of about 320°
and one step section 12 b runs over an angle δ' of about 40°. Fig. 5 shows an embodiment
where the step sections 12a, 12b are partly inside the region of the profile seal
6. The (upper) radius R' of step 12b and (upper) radius R of step 12a are both smaller
than the outer radius Pa and greater than the inner radius Pi of the profile seal.
However the "lower" radius of the steps is smaller than the inner radius Pi of the
profile seal 6. Lower radius is the radius in the area of the lower edge of the step.
The flat step size 12b with an inclination α of about 10° constitutes the venting
valve 12b influencing the inner sealing ring 6b to release inner pressure to open
the outer sealing lip 6a at a predetermined inner pressure in the bottle. This valve
function is strengthened by the steeper step side 12a with an inclination α of about
20° located approximately to 50 % inside the inner radius of the profile seal. The
step 12b of Fig. 6 corresponds to step 12b of Fig. 5. Moreover there is also a step
12a that runs over an angle δ of 340°. The steep step 12a has an inclination α of
about 60° and an (upper) radius R that is identical to or slightly smaller than the
inner radius Pi of the profile seal. The lower radius is smaller than Pi, however
the step is close enough to influence the inner sealing ring 6b. The valve function
is completed by the flat step side 12b with an inclination α of about 10° forming
the narrow venting valve.
[0028] In the embodiments from Figs. 8 to 14 and 18 and 19, the embossings are constructed
as grooves or beads 13, 13a, 13b of predetermined width B and height H running over
a predetermined angular range, wherein the grooves each have an outer side 16 which
descends towards the centre of the cap and an inner side 17 which ascends towards
the centre M of the cap. Width B here means the "upper width", that is the total width
of the groove in the area of its upper edges. In the embodiments from Figs. 8, 9,
10 and 19 the groove 13 is respectively constructed as a completely circumferential
annular groove 13. That is, the groove 13 extends over the total angular region or
over a full angle of 360°. The venting effect can be specifically set by the position
of the groove 13 relative to the profile seal 6. Thus, Fig. 10 shows an embodiment
with a reduced venting effect compared with Figs. 8 and 9 since the groove according
to Fig. 10 is displaced further into the region of the inner sealing ring 6b. However,
the groove 13 is also constructed as a completely circumferential groove. In contrast,
Figs. 11, 12 for example show embodiments in which a plurality of groove sections
13a,b are provided which each extend merely over a limited angular region δ, δ', δ".
[0029] A comparative examination of Fig. 12 and Figs. 12a and 12b clearly shows that the
individual grooves of the four grooves 13a-13b are each configured differently. For
example, two grooves 13a with a very strong valve effect are provided in which the
outer side 16 is arranged in the area of the outermost edge of the profile seal (or
somewhat outside). The outer radius R
a of the groove approximately corresponds in this region to the outer radius P
a of the profile seal 6 or is even somewhat larger. The inner radius R
i is in this region smaller than the outer radius P
a of the seal 6 and larger than the inner radius P
i of the seal 6. Another but weaker pressure-releasing valve effect is achieved via
the two diametrically opposite grooves 13b of same length where the descending outer
side 16 extends over approximately the total width b of the profile seal 6.
[0030] Fig. 11 shows an embodiment with one long groove section 13b extending over an angle
δ and one short groove section 13a extending over an angle δ' as a venting valve.
The groove 13b is completely within the region of the profile seal whereas the groove
section 13a is only partly in the region of the profile seal.
[0031] The groove side 16 of groove 13a has flat inclination and is partly outside the profile
seal increasing the venting effect.
[0032] Figure 14 furthermore shows an embodiment in which a plurality of groove sections
13a, b are provided which all have the same shape but are arranged on different radii
R
a, R
i. Thus, the two diametrically opposite short grooves 13a are arranged on a relatively
large outer radius R
a and inner Radius R
i in the area of the lip-kind outer sealing ring 6a whereas the grooves 13b which are
lengthened in comparison as shown in Fig. 14b are arranged in the area of the flat
inner sealing ring 6b and thus over a reduced outer radius R
a and inner radius R
i. The valve function is substantially taken over here by the two outer grooves 13a.
The groove sections 13a,b here are substantially U-formed in cross section.
[0033] A comparative analysis of the various exemplary embodiments clearly shows that the
geometry of the embossings 12, 12a, 12b, 13, 13a, 13b according to the invention can
be adapted in many ways to the desired circumstances and especially to the sealing
configuration used. Thus, the angle of inclination α of the step can be constructed
as relatively steep and have an angle of 45° to 90°, e.g. 60° to 80° with respect
to the horizontal (see Fig. 3a). However, it is also possible to select a flat angle
of inclination α in the area of the step which can, for example, be 10° to 45° (see
Fig. 4a). The angles of inclination β and γ of the sides 16, 17 of the circumferential
grooves can be selected similarly. For example, Fig. 8a shows an embodiment with a
relatively steep angle of inclination β of the outer side 16 wherein a relatively
flat ascending inner side 17 then adjoins this side 16. An inverse arrangement is
provided, for example, in the embodiment in Fig. 12b.
[0034] The figures furthermore make clear that the L-shaped profile seal 6 can also be adapted
within limits to the circumstances. A substantially vertically downward-directed outer
sealing ring or a sealing lip 6a is always realised, which is compressed with its
inner surface 18 as shown in Figs. 20 or 21 at sealing on the outer top 3a and outside
surfaces 3b of the bottle neck 3 providing a satisfactory sealing. In contrast, the
inner sealing ring or surface 6b is flat so that it is softly compressed on the top
surface 3a without embracing the inner surface 3c of the bottle. In this way, it is
ensured that in the course of the pressure rise, the inner sealing ring 6b can yield
so that a release of pressure can take place. It can also be seen in the figures that
the lower sealing surface 19 of the inner sealing ring 6b is arranged substantially
horizontally. Substantially horizontally in this case also includes those embodiments
in which the sealing surface 19 is inclined at a relatively small angle of 1° to 20°
e.g. 15° with respect to the horizontal in the one direction or in the other. For
this purpose reference should be made to Figs. 18 and 19 which show suitably inclined
sealing surfaces 19. Of particular importance however is that a true inner sealing
ring of substantial height and at a distance from the outer sealing ring or lip, which
inner sealing ring embraces the inner surface 3c of the bottle neck (type C-shaped
profile seal) prevent or strongly reduce a release of pressure and an interaction
of the profile seal with the embossings.
[0035] In each case, the thickness and sealing efficiency of the profile seal 6 is reduced
in a certain degree by the embossing so that the sealing properties can be adjusted
by the choice of shape and depth and position of the embossing. In addition, a quite
considerable saving of material can be achieved and overall manufacture will be cheap
as established conventional technique can be used with minor changes of toolings.
Finally, it is possible to additionally achieve a stiffening of the cap provided by
the embossing whereby the opening process can be advantageously influenced, by specifically
utilising lever effects. In this respect, in Fig. 7 for example, another upwardly
directed step-like shaping 20 is provided at a distance inside the inner radius of
the profile seal which has no influence on the valve effect but fulfils a stiffening
function. The same applies to the embodiments in Figs. 4, 12 or 14, for example. In
these cases, the valve-forming effect is substantially achieved by the "short" embossing
whilst the "long" shapings along the tear-off lines are only of secondary importance
in connection with the valve formation but facilitate tearing off the closure by the
favourable lever arrangement.
[0036] In the figures the bending radius r of the step between the covering panel and the
step descending side 14 and between the step descending side and the bottom plate
and the bending radius r of the grooves between the covering panel and the descending
side 16, between the descending side 16 and the ascending side 17 and between the
ascending side 17 and the covering panel also are indicated. At a smaller radius r
a distinct embossing bend is achieved and at a greater radius r a rounder embossing
bend. A distinct bend is influencing the venting valve effect more strongly than a
rounder bend, increasing the flexibility of the invention.
[0037] Fig. 20 shows the tear-off closure of Fig. 6 ready for sealing. Fig. 20a shows this
closure after sealing with the crimped-in skirt.
[0038] Fig. 21 shows the crown cork closure of Fig. 19 ready for sealing. Fig. 21 a shows
this closure after sealing with the skirt pressed to the bottle neck 3 and slightly
crimped-in under the bottle neck bead.
1. A closure for a container, especially a bottle, comprising an upper covering panel
(1) and comprising a circumferential collar or skirt (2) adjoining the covering panel
(1) on the outside,
wherein a sealing insert (5) is arranged on the underside of the covering panel (1),
which has a circumferential profile seal (6) on the outside,
characterised in that
the upper covering panel (1) has on its underside at least one projection, e.g. embossing
(12, 12a, 12b, 13, 13a, 13b), extending at least over a predefined angular region,
which projects in the area of or close to the profile seal (6) and interacts therewith
forming a valve.
2. The closure according to claim 1, characterised in that the profile seal (6) is constructed as substantially L-shaped in cross-section with
an outer first sealing ring (6a) and an inner second sealing ring (6b), wherein the
outer sealing ring (6a) has a greater height and/or a smaller width than the inner
sealing ring (6b).
3. The closure according to claim 1 or claim 2, characterised in that the underside projection or embossing is constructed as a circumferential step (12,
12a, 12b) with a side (14) which descends towards the centre (M) of the panel forming
a, for example, pressed down cap central region (15).
4. The closure according to claim 3, characterised in that the circumferential step has a plurality of step sections (12a, 12b) with different
radii (R, R') which each extends over a predetermined angular region (δ, δ', δ").
5. The closure according to claim 3 or 4, characterised in that the (upper and/or lower) radius of the step (12) or at least of a step section (12a,
12b) is smaller than or equal to the outer radius (Pa) of the profile seal (6) and/or greater than or equal to the inner radius (Pi) of the profile seal (6).
6. The closure according to anyone of the claims 3 to 5, characterised in that the (upper and/or lower) radius of the step (12) or at least one step section (12a,
12b) is (slightly) greater than the outer radius (Pa) of the profile seal (6) or (slightly) smaller than the inner radius (Pi) of the profile seal (6).
7. The closure according to any one of claims 3 to 6, characterised in that the side angle (α) of the step (12, 12a, 12b) with respect to the horizontal is about
40° to 90°, e.g. 60° to 80°, or is about 5° to 40°, e.g. 10° to 15°.
8. The closure according to claim 1 or claim 2, characterised in that the underside projection or embossing is constructed as a groove (13, 13a, 13b) formed
in the upper covering panel or as a protrusion adjoining or moulded onto the underside,
of predetermined width (B) and height (H), with an outer side (16) descending towards
the centre (M) of the cap and an inner side (17) ascending towards the centre (M)
of the cap.
9. The closure according to claim 8, characterised in that the groove (13) extends over the entire full angle as an annular groove (13).
10. The closure according to claim 8, characterised in that a plurality of grooves or groove sections (13a,b) are provided which each extend
over a predetermined angular section (δ, δ',δ").
11. The closure according to claim 10, characterised in that all the grooves or groove sections (13a,b) have the same radius.
12. The closure according to claim 10, characterised in that the grooves or groove sections (13a,b) have at least partly different radii.
13. The closure according to any one of claims 8 to 12, characterised in that the outer radius (Ra) and/or inner radius (Ri) of the groove or at least one groove section is smaller than or equal to the outer
radius (Pa) of the profile seal (6) and/or greater than or equal to the inner radius (Pi) of the profile seal (6).
14. The closure according to any of claims 8 to 13, characterised in that the outer radius (Ra) and/or inner radius (Ri) of the groove or at least one groove section is (slightly) greater than the outer
radius (Pa) of the profile seal (6) or (slightly) smaller than the inner radius (Pi) of the profile seal (6).
15. The closure according to any one of claims 8 to 14, characterised in that the side angle (β) of the descending side (16) with respect to the horizontal and/or
the side angle (γ) of the ascending side (17) with respect to the horizontal is about
40° to 90°, e.g. 60° to 80°.
16. The closure according to any one of claims 8 to 15, characterised in that the side angle (β) of the descending side (16) with respect to the horizontal and/or
the side angle (γ) of the ascending side (17) with respect to the horizontal is 5°
to 40°, e.g. 10° to 15°.
17. The closure according to any one of claims 8 to 16, characterised in that the width (B) of the groove is 1 mm to 5 mm, e.g. 1 mm to 3 mm.
18. The closure according to any one of claims 3 to 17, characterised in that the height (H) of the groove or step is 0.1 mm to 0.8 mm, e.g. 0.2 mm to 0.6 mm.
19. The closure according to any one of claims 1 to 18, characterised in that the shape, position, height and if appropriate the width of the groove(s) or step(s)
are set depending on the profile seal such that the valve opens at a predetermined
inner pressure of, for example, 6 bar to 10 bar and then closes again after the pressure
has fallen by a predetermined difference of, for example 0,5 bar to 3 bar.
20. The closure according to any of claims 1 to 19, characterised in that the bending radius (r) of the step is made to 0,2 to 1,5 mm, e.g. 0,3 mm to 1,0 mm,
or that the bending radius (r) of the groove or groove section is made 0,2 mm to 1,0
mm, e.g. 0,3 mm to 0,8 mm.
Amended claims in accordance with Rule 86(2) EPC.
1. A closure for a bottle for carbonated beverages, which closure is constructed as
crown-cork closure or tear-off closure,
comprising an upper covering panel (1) made of metal and comprising a circumferential
collar or skirt (2) adjoining the covering panel (1) on the outside,
wherein a sealing insert (5) is arranged on the underside of the covering panel (1),
which has a circumferential profile seal (6) on the outside, characterised in that
the upper covering panel (1) has on its underside at least one embossing (12, 12a,
12b, 13, 13a, 13b), extending at least over a predefined angular region, which projects
in the area of or close to the profile seal (6) and interacts therewith forming a
valve.
2. The closure according to claim 1, characterised in that the profile seal (6) is constructed as substantially L-shaped in cross-section with
an outer first sealing ring (6a) and an inner second sealing ring (6b), wherein the
outer sealing ring (6a) has a greater height and/or a smaller width than the inner
sealing ring (6b).
3. The closure according to claim 1 or claim 2, characterised in that the or embossing is constructed as a circumferential step (12, 12a, 12b) with a side
(14) which descends towards the centre (M) of the panel forming a, for example, pressed
down cap central region (15).
4. The closure according to claim 3, characterised in that the circumferential step has a plurality of step sections (12a, 12b) with different
radii (R, R') which each extends over a predetermined angular region (δ, δ', δ").
5. The closure according to claim 3 or 4, characterised in that the (upper and/or lower) radius of the step (12) or at least of a step section (12a,
12b) is smaller than or equal to the outer radius (Pa) of the profile seal (6) and/or greater than or equal to the inner radius (Pi) of the profile seal (6).
6. The closure according to anyone of the claims 3 to 5, characterised in that the (upper and/or lower) radius of the step (12) or at least one step section (12a,
12b) is (slightly) greater than the outer radius (Pa) of the profile seal (6) or (slightly) smaller than the inner radius (Pi) of the profile seal (6).
7. The closure according to any one of claims 3 to 6, characterised in that the side angle (α) of the step (12, 12a, 12b) with respect to the horizontal is about
40° to 90°, e.g. 60° to 80°, or is about 5° to 40°, e.g. 10° to 15°.
8. The closure according to claim 1 or claim 2, characterised in that the embossing is constructed as a groove (13, 13a, 13b) formed in the upper covering
panel of predetermined width (B) and height (H), with an outer side (16) descending
towards the centre (M) of the cap and an inner side (17) ascending towards the centre
(M) of the cap.
9. The closure according to claim 8, characterised in that the groove (13) extends over the entire full angle as an annular groove (13).
10. The closure according to claim 8, characterised in that a plurality of grooves or groove sections (13a,b) are provided which each extend
over a predetermined angular section (δ, δ', δ").
11. The closure according to claim 10, characterised in that all the grooves or groove sections (13a,b) have the same radius.
12. The closure according to claim 10, characterised in that the grooves or groove sections (13a,b) have at least partly different radii.
13. The closure according to any one of claims 8 to 12, characterised in that the outer radius (Ra) and/or inner radius (Ri) of the groove or at least one groove section is smaller than or equal to the outer
radius (Pa) of the profile seal (6) and/or greater than or equal to the inner radius (Pi) of the profile seal (6).
14. The closure according to any of claims 8 to 13, characterised in that the outer radius (Ra) and/or inner radius (Ri) of the groove or at least one groove section is (slightly) greater than the outer
radius (Pa) of the profile seal (6) or (slightly) smaller than the inner radius (Pi) of the profile seal (6).
15. The closure according to any one of claims 8 to 14, characterised in that the side angle (β) of the descending side (16) with respect to the horizontal and/or
the side angle (γ) of the ascending side (17) with respect to the horizontal is about
40° to 90°, e.g. 60° to 80°.
16. The closure according to any one of claims 8 to 15, characterised in that the side angle (β) of the descending side (16) with respect to the horizontal and/or
the side angle (γ) of the ascending side (17) with respect to the horizontal is 5°
to 40°, e.g. 10° to 15°.
17. The closure according to any one of claims 8 to 16, characterised in that the width (B) of the groove is 1 mm to 5 mm, e.g. 1 mm to 3 mm.
18. The closure according to any one of claims 3 to 17, characterised in that the height (H) of the groove or step is 0.1 mm to 0.8 mm, e.g. 0.2 mm to 0.6 mm.
19. The closure according to any one of claims 1 to 18, characterised in that the shape, position, height and if appropriate the width of the groove(s) or step(s)
are set depending on the profile seal such that the valve opens at a predetermined
inner pressure of, for example, 6 bar to 10 bar and then closes again after the pressure
has fallen by a predetermined difference of, for example 0,5 bar to 3 bar.
20. The closure according to any of claims 1 to 19, characterised in that the bending radius (r) of the step is made to 0,2 to 1,5 mm, e.g. 0,3 mm to 1,0 mm,
or that the bending radius (r) of the groove or groove section is made 0,2 mm to 1,0
mm, e.g. 0,3 mm to 0,8 mm.