[0001] The present invention relates to a stopper for closing containers, such as bottles,
in particular for fluid food substances.
[0002] The present invention relates in particular to a stopper designed to close bottles
for wine, food oils, vinegar, spirits, etc.
[0003] Natural cork stoppers with a cylindrically shaped body to be inserted in the neck
of the bottle or container to be closed are well known in the specific prior art.
[0004] In the technical sector of bottling of beverages, and in particular wine, it is known
that there is a need to replace traditional cork stoppers with synthetic stoppers
made from polymer material or other types of closure.
[0005] This need is shaped by specific economic factors and by the significant technical
drawbacks connected with traditional stoppers, including the possibility that cork
stoppers may release substances able to alter the taste of the wine as well as the
fact that mechanical properties may vary from stopper to stopper.
[0006] In order to meet this need in a positive way, stoppers made from normally expanded
polymer material or from so-called composite cork, i.e. comprising a plurality of
natural cork granules aggregated together by resins, normally polyurethane resins,
have been developed.
[0007] These latter stoppers differ in terms of the granulometry of the cork granules and
may possibly be provided with natural cork discs secured to both transverse bases
of the stopper.
[0008] Although the performance of these stoppers is more uniform and they reduce the extent
of organoleptic alterations of the wine in comparison with natural cork stoppers,
they do not, however, ensure complete neutrality or a high barrier to the absorption
of the aromatic fraction of the wine.
[0009] T-shaped stoppers are also known, and have a cylindrical body made from one of the
materials discussed above and a head made from various different materials, for instance
plastics, metal, glass, wood, etc., and are used for the closure of spirits, food
oils, vinegar, etc.
[0010] The stoppers must make it possible to preserve the integrity of the product contained
in the container closed by the stopper, preventing it from deteriorating over time
in particular as a result of an undesired interaction between the product and the
atmosphere outside the container and/or between the product and the stopper itself.
[0011] In order to obtain stoppers suitable for the above purpose, the bases of the natural
cork stopper have been covered with a barrier designed to reduce the interaction between
the stopper and the product.
[0012] Examples of such stoppers are known for instance from
WO 03/004367 which discloses a stopper with a body made from cork or synthetic material and provided
with a protective film designed to control the passage of gas and reduce the transfer
of molecules which may alter the beverage, including halo-anisolic compounds, through
the stopper.
[0013] The protective film comprises a first 'barrier' layer made from polymer material
having a low permeability to H
2O, O
2, CO
2 and impermeable to organic molecules. The protective film further comprises a second
adhesion layer so that the film may be applied to the body of the stopper, preferably
at one end thereof.
[0014] The body of the stopper disclosed in
WO03/004367 is tapered at the end to which the protective film is applied so as to limit the
deformation of the film when the stopper is being inserted into the neck of the bottle.
[0015] The stopper disclosed in
WO03/004367 does not, however, definitively resolve the problems of organoleptic neutrality as,
since the membrane does not fully cover the base of the stopper, and/or may become
at least partially detached from it, there may always be a risk of contamination.
[0016] A further drawback of the stopper disclosed in
WO03/004367 is that the protective film is glued by a layer of adhesive to the base of the stopper
and may become detached from the body of the stopper and fall into the bottle in which
the stopper is inserted.
[0017] The protective film disclosed in
WO03/004367 is not, moreover, stable over time but tends to change colour which users may find
off-putting. Another container stopper including a protective barrier is disclosed
in
WO2004/060764 A1. The problem underlying the present invention is one of providing a stopper functionally
and structurally designed to remedy the drawbacks discussed with respect to the cited
prior art.
[0018] A particular object of the invention is to provide a stopper provided with a barrier
layer made from a material which makes it possible drastically to reduce or block
the passage of gas through the stopper.
[0019] A further object of the invention is to provide a stopper in which the barrier layer
is stably attached to the body of the stopper.
[0020] This problem is resolved by the invention by means of a stopper with a barrier layer
embodied in accordance with the accompanying claims.
[0021] The characteristic features and advantages of the invention will become clear from
the following detailed description of preferred embodiments shown, by way of non-limiting
example, in the accompanying drawings, in which:
Fig. 1 is a front view of a stopper provided with a barrier element; this stopper
is not according to the invention;
Figs. 2-7 are views similar to Fig. 1 but relating to various embodiments of the barrier
element, wherein only the embodiments of Figs. 4, 5 are according to the invention;
Fig. 8 is a diagrammatic front view of a T-shaped stopper with a barrier element according
to an embodiment which is not part of the invention. Figs. 1-7 show a stopper 100
for containers.
[0022] The stopper 100 is preferably designed to close containers by being inserted in the
opening provided in the neck of the container, which is not shown in the Figures.
[0023] The stopper 100 comprises a compressible body 1 of a generally cylindrical shape
with rounded corners extending along a longitudinal axis X between two longitudinally
opposite base surfaces 2, 3.
[0024] The compressible body 1 has dimensions such that it may be housed and engaged in
an opening of a container, which is not shown in the Figures.
[0025] The compressible body 1 is made from composite cork or from any other expanded polymer
material having mechanical and leak-tightness properties suited for the purpose, for
instance polyolefin materials with or without metallocene catalysts, styrene block
polymers, EVA, TPV, TPU, TPE.
[0026] The material, or mixture of materials, of the compressible body 1 is selected so
as to obtain a stopper 100 which can be radially compressed in order to be inserted
in the opening of the container and then expands to lock the stopper in the neck of
the bottle or container to be closed by the stopper 100.
[0027] The material of the compressible body 1 is also selected so as to have a limited
weight, low relaxation and good resilient recall and structural fatigue strength.
[0028] In some preferred versions, the compressible body 1 is made from one or a plurality
of the following materials: polyethylene, polyolefin materials with metallocene catalysts,
or styrene polymers, for instance SEBS, SEPS and/or their polymer blends.
[0029] The stopper 100 is provided with a barrier element 4 made from a material having
a high impermeability to gases in order drastically to limit the passage of gas through
the stopper 10 and, at the same time, to reduce the absorption of the aromatic fraction
of the wine or beverage with which the stopper 100 comes into contact.
[0030] The barrier element 4 is attached to the body 1 of the stopper 100 at a transverse
surface portion 5 of the stopper 100 disposed transversely with respect to the longitudinal
axis X so as to intercept the flow of gas through the stopper 100 in both directions
of the arrow F, i.e. into or out from the container closed by the stopper 100.
[0031] The transverse surface portion 5 corresponds, in the versions shown, to a transverse
section 5' of the body 1 defined by a cutting plane Y perpendicular to the longitudinal
axis X of the body 1 at a desired position along the longitudinal axis X.
[0032] In other versions which are not shown, however, the transverse surface portion 5
may be a transverse section of the stopper 100 defined by a cutting plane inclined
with respect to the longitudinal axis X.
[0033] In other versions, for instance those shown in Figs. 1-5, the barrier element 4 of
the stopper 100 is attached to one of the base surfaces 2, 3 of the body 1. In this
case, the transverse surface 5 corresponds to the one of the base surfaces 2, 3 of
the body 1.
[0034] In the versions shown, the barrier element 4 is provided on the base surface 3 designed
to face, in use, the interior of the container closed by the stopper 100 in order
to provide a better barrier to the aromatic substances present in the beverage contained
therein.
[0035] In the version of Fig. 2, the barrier element 4 comprises a barrier layer 41 made
from a high-barrier plastics material. Use is preferably made of TPV, TPU or polyisobutylene,
or a material comprising a polyisobutylene at a percentage of between 10% and 80%.
[0036] In the more preferred version, use is made of SIBS, poly(styrene-block-isobutylene-block-styrene),
which is a material having a very high barrier to gases and having a high thermal
stability and excellent resilience, or an SIBS-based polymer material.
[0037] SIBS is a an elastomer material which forms a high barrier drastically reducing the
flow of gas from the atmosphere to the container and the flow of aromatic substances
of the beverage from the container to the atmosphere, while at the same time retaining
a high resilient capacity so that the plastics barrier layer 41 matches the deformations
to which the body 1 of the stopper 100 is subject during the closing operation.
[0038] SIBS also has a good chemical affinity with the polymer materials from which the
body 1 of the stopper 100 is made, as a result of which the barrier element 4 adheres
in a stable manner to the body 1 of the stopper 100, creating chemical links with
the material of the body 1.
[0039] In this case, the stopper 100 is made by co-moulding the body 1 and the barrier element
4 or by over-moulding the barrier element 4 on the body 1. In the version of Fig.
3, the barrier element 4 comprises a barrier layer 42 made from aluminium, or its
alloys, or from another ductile metal, for instance tin or copper or, as an alternative,
from plastic films of polyvinylidene chloride (PVDC), a very effective barrier polymer,
and/or ethylene vinyl alcohol (EVOH).
[0040] The metals listed above are materials with a high impermeability to gases, in particular
oxygen, and to the aromatic substances contained in beverages in general and thus
make it possible to provide an excellent barrier to the passage of these substances
through the stopper 100. Aluminium, tin and copper, as they are highly ductile, moreover,
may be formed as very thin layers.
[0041] PVDC and EVOH also make it possible to produce multi-layer films providing an excellent
barrier to the passage of gas through the stopper 100.
[0042] In a preferred version, the barrier layer 42 is made from aluminium.
[0043] The barrier element 4 further comprises an adhesion layer 421 designed to be interposed,
in use, between the compressible body 1 and the barrier layer 42 and to promote the
adhesion of the barrier layer 42 to the body 1.
[0044] The adhesion layer 421 is made from a polyolefin material such as PE or PP, EVA or
even PET. The adhesion layer 421 is made from a material having a good affinity with
both the material of the barrier layer 42 and with the material of the body 1 so as
to ensure good adhesion with both these materials and avoid any undesirable detachment
of the barrier element 4 from the body 1 or the separation of the barrier layer 4
and the adhesion layer 421.
[0045] The barrier element 4 further comprises a further adhesion layer 422 designed to
be applied externally to the barrier layer 42 so that the latter is interposed between
the adhesion layer 421 and the further adhesion layer 422.
[0046] The further adhesion layer 422 is made from a polyolefin material, preferably high-barrier,
usually PE or PP, EVA or even PET. The further adhesion layer 422 is made from a material
having a good affinity with the material of the barrier layer 42 in order to ensure
that it adheres properly to the latter.
[0047] The material of the adhesion layer 421 and/or the further adhesion layer 422 is selected
in line with the material used for the barrier layer 42.
[0048] The adhesion layer 421 is preferably made from PE, while the further adhesion layer
422 is made from PET or PE.
[0049] The further adhesion layer 422 is shaped so that it covers almost completely the
barrier layer 42. In this way, with the stopper inserted in the bottle, the further
adhesion layer 422 is interposed between the barrier layer 42 and the content of the
bottle, preventing direct contact between the barrier layer 42 and the content of
the bottle.
[0050] In this way the barrier layer 42 is isolated from the beverage which is an important
factor especially in cases in which the barrier layer 42 is made from metal, and the
barrier element 4 is provided with greater structural resistance, preventing it from
becoming detached from the body 1.
[0051] The further adhesion layer 422 also makes it possible to improve the structural compactness
of the barrier element 4 in the various conditions of use, making it possible to prevent
the barrier element 4 from being deformed following radial compression for the insertion
of the stopper 100 in the container.
[0052] In other versions (not shown), the barrier element 4 further comprises a further
layer interposed between the barrier layer 42 and the adhesion layer 421 or the further
adhesion layer 422 made from PET, or another appropriate material having a good chemical
affinity with the materials used for the adjacent layers. The further layer is made
from a material which may be stamped and may be provided with a stamp in order to
personalize the stopper, for instance stamped PET.
[0053] The further layer may also further increase the barrier effect and the stability
of the barrier elements 4.
[0054] The stopper 100 described with reference to Fig. 3 may be made, for instance, by
firstly forming the barrier element 4 and then attaching it to the body 1 in order
to cause the adhesion layer 421 to adhere to the body 1 of the stopper 100.
[0055] If the barrier layer 42 is made from aluminium, a plasma deposition of aluminium
powder may possibly be made on the adhesion layer or on the further adhesion layer,
and the metal barrier layer then covered with the further adhesion layer or vice versa
with the adhesion layer and the barrier element obtained lastly attached to the body
1. The plasma deposition of aluminium powder is preferably carried out under vacuum.
[0056] In a further embodiment, shown for instance in Figs. 4 and 5, the stopper 100 comprises
a barrier device 40 in turn comprising a barrier element 4 formed, for instance, as
one of the versions described with reference to the preceding drawings and preferably
as one of the versions described with reference to Fig. 3, possibly provided with
the further layer of PET, to which an additional barrier layer 43 shaped so as to
encapsulate the previously formed barrier element 4 is applied.
[0057] The barrier device 40 may in particular comprise a barrier layer 42 made from aluminium,
or its alloys, or from another ductile metal, for instance tin or copper or, as an
alternative, from plastic films of polyvinylidene chloride (PVDC), a very effective
barrier polymer, and/or ethylene vinyl alcohol (EVOH); an adhesion layer 421 made
from a polyolefin material such as PE or PP, EVA or even PET; a further adhesion layer
422 made from a polyolefin material, preferably high-barrier, normally PE or PP, EVA
or even PET and a further barrier layer 43 formed as described below. The barrier
device 40 may possibly comprise a further layer interposed between the barrier layer
42 and the adhesion layer 421 or the further adhesion layer 422 made from PET, or
another material having good chemical affinity with the materials used for the adjacent
layers.
[0058] In this case as well, the barrier element 4 may first be formed and then attached
to the body 1 of the stopper 100 and then the further barrier layer 43 may be over-moulded
on the barrier element 4.
[0059] The further barrier layer 43 is made from a material having a good affinity with
the material of the body 1 of the stopper so as to obtain good adhesion between the
further barrier layer 43 and the body 1 of the stopper.
[0060] The further barrier layer 43 is made from a material having a good affinity with
the material of the further adhesion layer 422.
[0061] In a version, the further barrier layer 43 is made from isobutylene-based elastomers,
preferably SIBS, or also from TPU and/or TPV, SEBS, or their polymer blends.
[0062] In one version, the further barrier layer 43 may be slightly expanded and/or mixed
with PE in order farther to improve the adhesion of the further barrier layer 43 to
the body 1 of the stopper 100. If the further barrier layer 43 is made from SIBS,
1.5-2% by weight of NaHCO
3 may be added.
[0063] In another version, the further barrier layer 43 is made from the same material as
the body 1 of the stopper 100 in order further to improve the adhesion of the further
barrier layer 43 to the body 1 of the stopper 100. The further barrier layer 43 is
injection moulded on the previously formed barrier element 4 so that the barrier element
4 is interposed and completely enclosed between the further barrier layer 43 and the
body 1 of the stopper 100.
[0064] In this way, it is possible to improve the structural cohesion of the stopper 100
in the various conditions of use, and in particular to prevent damage to and deformations
of the barrier device 40 following the radial compression of the stopper 100.
[0065] This version also makes it possible to optimise the stability of the barrier device
40 on the body 1 of the stopper 100.
[0066] It is possible, in particular, to improve the adhesion of the barrier element 4 to
the body 1, preventing undesirable detachments and/or radial deformations thereof
when the stopper 100 is being used.
[0067] The presence of the further barrier layer 43, moreover, makes it possible further
to increase the barrier effect which may be obtained, i.e. further to increase the
impermeability to gases and aromatic substances that may be obtained with the stopper
100.
[0068] With this version of the stopper 100 it is also possible to increase the integrity
of the product contained in the stoppered container.
[0069] In order to improve the adhesion of the further barrier layer 43 to the body 1, the
barrier element 4, in this version, is shaped such that it occupies a transverse surface
portion 5" having a smaller extension than the extension of the normal transverse
section 5', considered with reference to the longitudinal axis X of the body 1, so
that an attachment area 6 for the further barrier layer 43 is defined on the base
surface 3.
[0070] The barrier element 4 is in particular shaped such that an attachment area 6, shaped
as a circular crown 6 to which the further barrier layer 43 is attached, is defined
on the base surface 3 of the body 1.
[0071] In a preferred version, the circular crown 6 has a width of between 0.5 and 2% of
the diameter of the body of the stopper, preferably approximately 1%.
[0072] In order further to increase the attachment of the further barrier layer 43 to the
body 1 of the stopper 100, in the version of Fig. 5, the body 1 is tapered along the
longitudinal axis X at the longitudinal end portion 3a. The latter therefore has a
profile of generally frustoconical shape tapered along the longitudinal axis X, the
base surface 3 forming the smaller base of the frustum having a smaller extension
than the normal transverse section 5' of the body 1.
[0073] The smaller base of the frustum occupies a transverse surface portion 5" having a
smaller extension than the extension of the normal transverse section 5'.
[0074] The barrier element 4, produced for instance in one of the ways discussed with reference
to Fig. 3, is applied to the smaller base of the frustum 5". The further barrier layer
43 is applied to the body 1 so as to completely enclose, the barrier element 4. The
further barrier layer 43 is attached to the lateral surface 3b of the frustum so as
to surround the longitudinal end portion 3a and to be attached to the lateral surface
3b itself.
[0075] The lateral surface 3b of the frustum forms the attachment area 6 for the further
barrier layer 43. The tapering takes place such that the lateral surface 3b is inclined
with respect to the longitudinal axis by an angle α of between 25° and 75°.
[0076] This configuration makes it possible further to improve the attachment of the further
barrier layer 43 to the body 1 and to obtain a stopper 100 with high mechanical properties.
[0077] In this case as well, the barrier element 4 is encapsulated between the body 1 of
the stopper and the further barrier layer 43, obtaining a barrier device 40 having
improved mechanical strength and improved performance.
[0078] In other versions, as shown for instance in Fig. 6, the stopper 100 comprises two
separate barrier elements 4 produced in any one of the ways discussed above and attached
to the two opposite base surfaces 2, 3 of the compressible body 1 respectively.
[0079] Similarly, in versions which are not shown, the stopper of the invention may be provided
with two separate barrier devices 40 produced in any one of the ways discussed above
and provided at the two opposite base surfaces 2, 3 of the compressible body 1.
[0080] This provides a stopper 100 having a symmetrical configuration and means that it
is not necessary to control the orientation of the stopper 100 when it is being applied
to the neck of a container.
[0081] The stopper 100, provided with the two barrier elements 4, or barrier devices 40,
may be inserted at either end 2, 3 in the container for which it is intended, thereby
facilitating and speeding up the stoppering process.
[0082] In some versions, for instance as shown in Fig. 7, the barrier element 4 is provided
on a normal transverse section 5' of the body 1 disposed in an intermediate position
along the longitudinal axis X between the two opposite base surfaces 2, 3 of the compressible
body 1.
[0083] In this version, the stopper 1 has two separate body portions 1a, 1b between which
the barrier element 4 is interposed.
[0084] In another version (not shown), the barrier device 40 is provided on a normal transverse
section 5 of the body 1 disposed in an intermediate longitudinal position between
the two opposite base surfaces 2, 3 of the compressible body 1, the barrier device
40 having a smaller transverse section than the normal transverse section 5 of the
body 1 so that the barrier device 40 is completely embedded in the body of the stopper.
[0085] In some versions (not shown), the barrier element 4 is provided with a plurality
of holes provided in the barrier layer 42 and intended to enable the flow of gas through
the stopper 100 to be regulated.
[0086] By varying the dimensions and/or the number and/or the density of the holes, it is
possible to regulate the oxygen transfer rate (OTR) between the interior and the exterior
of the container to which the stopper of the invention is applied.
[0087] It is also possible, by calibrating and dimensioning the holes, to obtain an oxygen
exchange that varies in an almost continuous manner, thus providing a level of permeability
defined in accordance with the type of wine, or in general the product contained in
the bottle closed by the stopper.
[0088] In this way, it is possible to obtain a stopper which is suitable for closing bottles
containing various types of beverage and in particular various types of wines.
[0089] The various wines, if they are to "age" correctly, in practice require different
amounts of oxygen from outside. For the majority of white wines, a high oxygen barrier
is for instance necessary, whereas red wines, depending on the grape variety and the
type of vinification and ageing, may require an appropriate and variable amount of
oxygen to achieve their maximum aromatic level.
[0090] In other versions (not shown) of the stopper of the invention, the barrier element
4 is attached to a transverse surface portion 5 corresponding to a zone of a transverse
section of the body 1 of the stopper 100 having a smaller extension than the transverse
section 5 thereof.
[0091] This makes it possible to limit the radial deformation of the barrier element 4 during
the compression of the stopper 100 for its insertion into the bottle to be closed.
The transverse surface portion lacking the barrier element 4 enables, moreover, some
gas to pass through the stopper 100.
[0092] Fig. 8 shows a stopper 100' comprising a head 7 from which a body 1' substantially
of cylindrical shape extends along the longitudinal axis X of the stopper 100'. The
body may be made from one of the materials discussed above and the head 7 may be made
from the same material as the body 1' or from a different material, usually a material
with a different compressibility, preferably lower than the compressibility of the
material of the body 1'.
[0093] The head 7 has a transverse section S1 of a greater extension than the transverse
section 5 of the body 1'.
[0094] In the stoppers configured in this way, known as T-shaped stoppers, the barrier element
4' or respectively the barrier device 40' is provided at the base surface 3' of the
compressible body 1' opposite the head 7, i.e. the barrier element 4' or respectively
the barrier device is applied to the base surface 3' which is designed to face, in
use, the interior of the container to which the stopper 100' is applied.
[0095] The barrier element 4' may be made in any one of the ways discussed above.
[0096] In a version (not shown), the T-shaped stopper 100' may also be provided with the
barrier device made in any one of the ways discussed above.
[0097] A T-shaped stopper is thus obtained which prevents the passage of gas through the
stopper. In this case as well, moreover, the barrier element 4' may be provided with
holes designed to enable the flow of gas through the stopper 100' to be regulated.
[0098] The invention thus resolves the stated problem, and achieves many advantages, including
that of providing a stopper having a barrier state in respect of gases and aromatic
substances which is particularly effective in comparison with known stoppers.
[0099] The invention advantageously makes it possible in particular to obtain a stopper
which is structurally very compact, preventing the contamination of the beverage contained
in the container to which the stopper is applied.
[0100] According to the invention, a stopper is also obtained whose oxygen transfer rate
may be appropriately varied by adapting the stopper to the particular oxygenation
requirements specific to the various types of beverages which may be contained in
the container closed by the stopper.
1. Stopper (100; 100') for closing a container, comprising a main body (1; 1') so shaped
as to be removably housed and engaged in an opening of said container, and extending
along a longitudinal axis (X) thereof between two opposed base surfaces (2, 3) which
face the outside and the inside of the containers, respectively, when said main body
(1; 1') is housed and engaged in said opening, said stopper (100; 100') comprising
a barrier element (4; 4') made from a material with high impermeability to gases and
provided on a transverse surface portion (5") on a base surface (3) of said stopper
(100; 100') positioned transversely with respect to said longitudinal axis (X) so
as to intercept the flow of gas through said stopper (100; 100'), said barrier element
(4; 4') being intended to reduce the passage of gas through said stopper (100), said
barrier element (4, 4') comprising a plastic barrier layer (41; 43) made from polyisobutylene-based
elastomers, preferably SIBS and/or TPV and/or TPU, characterized in that it further comprises a further barrier layer (43) applied onto said barrier element
(4) so that the latter is enclosed between said further barrier layer (43) and said
body (1; 1'), said transverse surface portion (5") having a smaller extension than
the transverse section (5') of said body (1; 1') so that an attachment area (6) for
said further barrier layer (43) is defined on said base surface (3).
2. Stopper (100; 100') for closing a container, comprising a main body (1; 1') shaped
so as to be removably housed and engaged in an opening of said container, and extending
along a longitudinal axis (X) thereof between two opposed base surfaces (2, 3) which
face the outside and the inside of the containers, respectively, when said main body
(1; 1') is housed and engaged in said opening, said stopper (100; 100') comprising
a barrier element (4; 4') made from a material with high impermeability to gases and
provided on a transverse surface portion (5") on a base surface (3) of said stopper
(100; 100') positioned transversely with respect to said longitudinal axis (X) so
as to intercept the flow of gas through said stopper (100; 100'), said barrier element
(4; 4') being intended to reduce the passage of gas through said stopper (100), said
barrier element (4; 4') comprising a barrier layer (42) made from aluminium and/or
alloys thereof, or tin and/or alloys thereof, or EVOH, or PVDC, characterized in that it further comprises a further barrier layer (43) applied onto said barrier element
(4) so that the latter is enclosed between said further barrier layer (43) and said
body (1; 1'), said transverse surface portion (5") having a smaller extension than
the transverse section (5') of said body (1; 1') so that an attachment area (6) for
said further barrier layer (43) is defined on said base surface (3).
3. Stopper according to claim 2, wherein said barrier element (4; 4') additionally comprises
an adhesion layer (421) intended to be interposed, in use, between said body (1; 1')
and said barrier layer (42), and intended to promote the adhesion of said barrier
layer (42) to said body (1; 1').
4. Stopper according to claim 3, wherein said barrier element (4; 4') additionally comprises
a further adhesion layer (422) intended to be applied to said barrier layer (42),
so that the latter is interposed between said adhesion layer (421) and said further
adhesion layer (422).
5. Stopper according to claim 3 or 4, wherein said adhesion layer (421) and/or said further
adhesion layer (422) is made from a polyolefin material, or from the same material
as that of which said body is made.
6. Stopper according to any one of claims 3 to 5, wherein said adhesion layer (421) and/or
said further adhesion layer (422) is made from PE, PP, PET or EVA.
7. Stopper according to any one of claims 2 to 6, wherein said barrier layer (42) has
a plurality of holes for regulating the flow of gas through said body (1; 1').
8. Stopper according to any one of the preceding claims, wherein said transverse surface
portion (5") is provided on at least one of said base surfaces (2, 3) of said body
(1; 1').
9. Stopper according to any one of the preceding claims, and comprising a first and a
second barrier element (4, 4') provided on the two opposite base surfaces (2, 3) of
said body (1,1').
10. Stopper according to any one of the preceding claims, wherein said further barrier
layer (43) is made from polyisobutylene-based elastomers, preferably from SIBS, or
possibly TPU and/or TPV.
11. Stopper according to any one of the preceding claims, wherein said further barrier
layer (43) is made from elastomers similar to the material from which said body (1;
1') is made.
12. Stopper according to any one of the preceding claims, wherein a longitudinal end (3a)
of said body (1; 1') is tapered so as to define said attachment area (6) for said
further barrier layer (43) on said body (1, 1').
13. Stopper according to the preceding claim, wherein said longitudinal end (3a) is tapered
so as to define an attachment wall (3b) inclined with respect to said longitudinal
axis (X) by an angle (α) of between 25° and 75°.
14. Stopper according to any one of the preceding claims, wherein said compressible body
(1) is of cylindrical shape and is made from polyethylene and/or polyolefin materials
with metallocene catalysts, or styrene polymers such as SEBS.
15. Stopper according to any one of the preceding claims, comprising a head (7) provided
at the longitudinal end (2) of said body (1') which is intended to face, in use, towards
the outside of said container to be closed with said stopper, said head (7) having
a cross section (S1) whose extension is greater than that of the cross section (5)
of said body (1').
1. Stopfen (100; 100') zum Schließen eines Behälters mit einem Hauptkörper (1; 1'), der
so ausgebildet ist, um entfernbar in einer Öffnung des Behälters aufgenommen und mit
diesem in Eingriff zu sein, und sich entlang einer Längsachse (X) davon zwischen zwei
gegenüberliegenden Basisflächen (2, 3) erstreckt, die jeweils dem Äußeren und dem
Inneren der Behälter zugewandt sind, wenn der Hauptkörper (1; 1') in der Öffnung aufgenommen
und mit dieser in Eingriff ist, wobei der Stopfen (100; 100') ein Sperrelement (4;
4') aufweist, das aus einem Material mit einer hohen Undurchlässigkeit für Gase hergestellt
und auf einem Querflächenbereich (5") auf einer Basisfläche (3) des Stopfens (100;
100') vorgesehen ist, der quer bezüglich der Längsachse (X) positioniert ist, um so
den Gasstrom durch den Stopfen (100; 100') zu unterbrechen, wobei das Sperrelement
(4; 4') zum Verringern des Gasdurchgangs durch den Stopfen (100) bestimmt ist, wobei
das Sperrelement (4; 4') eine Kunststoffsperrschicht (41; 43) aufweist, die aus Polyisobutylen-basierenden
Elastomeren, vorzugsweise SIBS und/oder TPV und/oder TPU, hergestellt ist, dadurch gekennzeichnet, dass er ferner eine weitere Sperrschicht (43) aufweist, die auf dem Sperrelement (4) aufgebracht
ist, so dass Letzteres von der weiteren Sperrschicht (43) und dem Körper (1; 1') umschlossen
ist, wobei der Querflächenbereich (5") eine kleinere Ausdehnung als der Querabschnitt
(5') des Körpers (1; 1') aufweist, so dass ein Befestigungsbereich (6) für die weitere
Sperrschicht (43) auf der Basisfläche (3) definiert ist.
2. Stopfen (100; 100') zum Schließen eines Behälters mit einem Hauptkörper (1; 1'), der
so ausgebildet ist, um entfernbar in einer Öffnung des Behälters aufgenommen und mit
diesem in Eingriff zu sein, und sich entlang einer Längsachse (X) davon zwischen zwei
gegenüberliegenden Basisflächen (2, 3) erstreckt, die jeweils dem Äußeren und dem
Inneren der Behälter zugewandt sind, wenn der Hauptkörper (1; 1') in der Öffnung aufgenommen
und mit dieser in Eingriff ist, wobei der Stopfen (100; 100') ein Sperrelement (4;
4') aufweist, das aus einem Material mit einer hohen Undurchlässigkeit für Gase hergestellt
und auf einem Querflächenbereich (5") auf einer Basisfläche (3) des Stopfens (100;
100') vorgesehen ist, der quer bezüglich der Längsachse (X) positioniert ist, um so
den Gasstrom durch den Stopfen (100; 100') zu unterbrechen, wobei das Sperrelement
(4; 4') zum Verringern des Gasdurchgangs durch den Stopfen (100) bestimmt ist, wobei
das Sperrelement (4; 4') eine Sperrschicht (41; 43) aufweist, die aus Aluminium und/oder
Legierungen davon, oder Zinn und/oder Legierungen davon, oder EVOH oder PVDC hergestellt
ist, dadurch gekennzeichnet, dass er ferner eine weitere Sperrschicht (43) aufweist, die auf dem Sperrelement (4) aufgebracht
ist, so dass Letzteres von der weiteren Sperrschicht (43) und dem Körper (1; 1') umschlossen
ist, wobei der Querflächenbereich (5") eine kleinere Ausdehnung als der Querabschnitt
(5') des Körpers (1; 1') aufweist, so dass ein Befestigungsbereich (6) für die weitere
Sperrschicht (43) auf der Basisfläche (3) definiert ist.
3. Stopfen gemäß Anspruch 2, wobei das Sperrelement (4; 4') zusätzlich eine Adhäsionsschicht
(421) aufweist, die vorgesehen ist, um bei Anwendung zwischen dem Körper (1; 1') und
der Sperrschicht (42) angeordnet zu sein, und bestimmt ist, um die Adhäsion der Sperrschicht
(42) zum Körper (1; 1') zu unterstützen.
4. Stopfen gemäß Anspruch 3, wobei das Sperrelement (4; 4') zusätzlich eine weitere Adhäsionsschicht
(422) aufweist, die bestimmt ist, um auf die Sperrschicht (42) aufgebracht zu werden,
so dass die Letztere zwischen der Adhäsionsschicht (421) und der weiteren Adhäsionsschicht
(422) angeordnet ist.
5. Stopfen gemäß Anspruch 3 oder 4, wobei die Adhäsionsschicht (421) und/oder die weitere
Adhäsionsschicht (422) aus einem Polyolefin-Werkstoff hergestellt sind, oder aus demselben
Werkstoff wie dem des Körpers hergestellt sind.
6. Stopfen gemäß einem der Ansprüche 3 bis 5, wobei die Adhäsionsschicht (421) und/oder
die weitere Adhäsionsschicht (422) aus PE, PP, PET oder EVA hergestellt sind.
7. Stopfen gemäß einem der Ansprüche 2 bis 6, wobei die Sperrschicht (42) eine Mehrzahl
von Öffnungen zum Regulieren des Gasstroms durch den Körper (1; 1') aufweist.
8. Stopfen gemäß einem der vorhergehenden Ansprüche, wobei der Querflächenbereich (5")
auf zumindest einer der Basisflächen (2, 3) des Körpers (1; 1') vorgesehen ist.
9. Stopfen gemäß einem der vorhergehenden Ansprüche und mit einem ersten und einem zweiten
Sperrelement (4, 4'), die auf den gegenüberliegenden Basisflächen (2, 3) des Körpers
(1,1') vorgesehen sind.
10. Stopfen gemäß einem der vorhergehenden Ansprüche, wobei die weitere Sperrschicht (43)
aus Polyisobutylen-basierenden Elastomeren, vorzugsweise aus SIBS oder gegebenenfalls
aus TPU und/oder TPV, hergestellt ist.
11. Stopfen gemäß einem der vorhergehenden Ansprüche, wobei die weitere Sperrschicht (43)
aus Elastomeren hergestellt ist, die ähnlich dem Werkstoff sind, aus dem der Körper
(1; 1') hergestellt ist.
12. Stopfen gemäß einem der vorhergehenden Ansprüche, wobei ein Längsende (3a) des Körpers
(1; 1') konisch ist, um so einen Befestigungsbereich (6) für die weitere Sperrschicht
(43) auf dem Körper (1; 1') zu definieren.
13. Stopfen gemäß dem vorhergehenden Anspruch, wobei das Längsende (3a) konisch ist, um
so eine Befestigungswand (3b) zu definieren, die bezüglich der Längsachse (X) um einen
Winkel (α) zwischen 25° und 75° geneigt ist.
14. Stopfen gemäß einem der vorhergehenden Ansprüche, wobei der komprimierbare Körper
(1) zylindrisch ist und aus Polyethylen- und/oder Polyolefin-Werkstoffen mit Metallocen-Katalysatoren,
oder aus Styrol-Polymeren, wie zum Beispiel SEBS, hergestellt ist.
15. Stopfen gemäß einem der vorhergehenden Ansprüche mit einem Kopf (7), der am Längsende
(2) des Körpers (1') vorgesehen ist, der bestimmt ist, um bei Anwendung der Außenseite
des Containers gegenüberzuliegen, der mit dem Stopfen zu schließen ist, wobei der
Kopf (7) einen Querschnitt (S1) aufweist, dessen Ausdehnung größer als die des Querschnitts
(5) des Körpers (1') ist.
1. Obturateur (100 ; 100') pour la fermeture d'un récipient, comprenant un corps principal
(1 ; 1') présentant une forme de façon à être logé et emboîté de manière amovible
dans une ouverture dudit récipient et s'étendant le long d'un axe longitudinal (X)
de celui-ci entre deux surfaces de base opposées (2, 3) qui font face à l'extérieur
et à l'intérieur des récipients respectivement lorsque ledit corps principal (1 ;
1') est logé et emboîté dans ladite ouverture, ledit obturateur (100; 100') comprenant
un élément de barrière (4 ; 4') constitué d'un matériau avec une imperméabilité élevée
aux gaz et disposé sur une portion de surface transversale (5") sur une surface de
base (3) dudit obturateur (100 ; 100'), positionnée transversalement par rapport audit
axe longitudinal (X) de façon à intercepter le flux de gaz à travers ledit obturateur
(100 ; 100'), ledit élément de barrière (4 ; 4') étant destiné à réduire le passage
des gaz à travers ledit obturateur (100), ledit élément de barrière (4, 4') comprenant
une couche de barrière en matière plastique (41 ; 43) constituée d'élastomères à base
de poly-isobutylène, de préférence du SIBS et/ou du TPV et/ou du TPU, caractérisé en ce qu'il comprend en outre une couche de barrière supplémentaire (43) appliquée sur ledit
élément de barrière (4) de façon à ce que ce dernier soit inclus entre ladite couche
de barrière supplémentaire (43) et ledit corps (1 ; 1'), ladite portion de surface
transversale (5") ayant une extension plus petite que la section transversale (5')
dudit corps (1 ; 1') de façon à ce qu'une zone de fixation (6) pour ladite couche
de barrière supplémentaire (43) soit définie sur ladite surface de base (3).
2. Obturateur (100 ; 100') pour la fermeture d'un récipient, comprenant un corps principal
(1 ; 1') présentant une forme de façon à être logé et emboîté de manière amovible
dans une ouverture dudit récipient et s'étendant le long d'un axe longitudinal (X)
de celui-ci entre deux surfaces de base opposées (2, 3) qui font face à l'extérieur
et à l'intérieur des récipients respectivement lorsque ledit corps principal (1 ;
1') est logé et emboîté dans ladite ouverture, ledit obturateur (100; 100') comprenant
un élément de barrière (4 ; 4') constitué d'un matériau avec une imperméabilité élevée
aux gaz et disposé sur une portion de surface transversale (5") sur une surface de
base (3) dudit obturateur (100 ; 100'), positionnée transversalement par rapport audit
axe longitudinal (X) de façon à intercepter le flux de gaz à travers ledit obturateur
(100 ; 100'), ledit élément de barrière (4 ; 4') étant destiné à réduire le passage
des gaz à travers ledit obturateur (100), ledit élément de barrière (4, 4') comprenant
une couche de barrière (42) constituée d'aluminium et/ou d'alliages de celui-ci ou
d'étain et/ou d'alliages de celui-ci, ou d'EVOH ou de PVDC, caractérisé en ce qu'il comprend en outre une couche de barrière supplémentaire (43) appliquée sur ledit
élément de barrière (4) de façon à ce que ce dernier soit inclus entre ladite couche
de barrière supplémentaire (43) et ledit corps (1 ; 1'), ladite portion de surface
transversale (5") ayant une extension plus petite que la section transversale (5')
dudit corps (1 ; 1') de façon à ce qu'une zone de fixation (6) pour ladite couche
de barrière supplémentaire (43) soit définie sur ladite surface de base (3).
3. Obturateur selon la revendication 2, dans lequel ledit élément de barrière (4 ; 4')
comprend en outre une couche d'adhérence (421) destinée à être intercalée, lors de
l'utilisation, entre ledit corps (1 ; 1') et ladite couche de barrière (42) et destinée
à favoriser l'adhérence de ladite couche de barrière (42) audit corps (1 ; 1').
4. Obturateur selon la revendication 3, dans lequel ledit élément de barrière (4 ; 4')
comprend en outre une couche d'adhérence supplémentaire (422) destinée à être appliquée
sur ladite couche de barrière (42), de façon à ce que cette dernière soit intercalée
entre ladite couche d'adhérence (421) et ladite couche d'adhérence supplémentaire
(422).
5. Obturateur selon la revendication 3 ou 4, dans lequel ladite couche d'adhérence (421)
et/ou ladite couche d'adhérence supplémentaire (422) est constituée d'un matériau
de type polyoléfine ou du même matériau que celui dont ledit corps est constitué.
6. Obturateur selon l'une des revendications 3 à 5, dans lequel ladite couche d'adhérence
(421) et ledit couche d'adhérence supplémentaire (422) est constituée de PE, de PP,
de PET ou d'EVA.
7. Obturateur selon l'une des revendications 2 à 6, dans lequel ladite couche de barrière
(42) comprend une pluralité de trous pour réguler le flux de gaz à travers ledit corps
(1 ; 1').
8. Obturateur selon l'une des revendications précédentes, dans lequel ladite portion
de surface transversale (5") est disposée sur au moins une desdites surfaces de base
(2, 3) dudit corps (1 ; 1').
9. Obturateur selon l'une des revendications précédentes, et comprenant un premier et
un deuxième élément de barrière (4, 4') disposés sur les deux surfaces de base opposées
(2, 3) dudit corps (1, 1').
10. Obturateur selon l'une des revendications précédentes, dans lequel ladite couche de
barrière supplémentaire (43) est constituée d'élastomères à base de poly-isobutylène,
de préférence de SIBS ou le cas échéant de TPU et/ou de TPV.
11. Obturateur selon l'une des revendications précédentes, dans lequel ladite couche de
barrière supplémentaire (43) est constituée d'élastomères similaires au matériau dont
est constitué ledit corps (1 ; 1').
12. Obturateur selon l'une des revendications précédentes, dans lequel une extrémité longitudinale
(3a) dudit corps (1 ; 1') est conique de façon à définir ladite zone de fixation (6)
pour ladite couche de barrière supplémentaire (43) sur ledit corps (1, 1').
13. Obturateur selon la revendication précédente, dans lequel ladite extrémité longitudinale
(3a) est conique de façon à définir une paroi de fixation (3b) inclinée par rapport
audit axe longitudinal (X) d'un angle (α) entre 25° et 75°.
14. Obturateur selon l'une des revendications précédentes, dans lequel ledit corps compressible
(1) présente une forme cylindrique et est constitué de polyéthylène et/ou de matériaux
de type polyoléfine avec des catalyseurs métallocènes ou des polymères de styrène
tels que du SEBS.
15. Obturateur selon l'une des revendications précédentes, comprenant une tête (7) disposée
au niveau de l'extrémité longitudinale (2) dudit corps (1') qui est destinée à faire
face, lors de l'utilisation, en direction de l'extérieur dudit récipient à fermer
avec ledit obturateur, ladite tête (7) ayant une section transversale (S1) dont l'extension
est supérieure à celle de la section transversale (5) dudit corps (1').