CA2203744A1 - Sealing disc for a closure cap for containers - Google Patents
Sealing disc for a closure cap for containersInfo
- Publication number
- CA2203744A1 CA2203744A1 CA002203744A CA2203744A CA2203744A1 CA 2203744 A1 CA2203744 A1 CA 2203744A1 CA 002203744 A CA002203744 A CA 002203744A CA 2203744 A CA2203744 A CA 2203744A CA 2203744 A1 CA2203744 A1 CA 2203744A1
- Authority
- CA
- Canada
- Prior art keywords
- layer
- sealing disc
- oxygen
- substance
- underside
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/24—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants
- B65D81/26—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants with provision for draining away, or absorbing, or removing by ventilation, fluids, e.g. exuded by contents; Applications of corrosion inhibitors or desiccators
- B65D81/266—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants with provision for draining away, or absorbing, or removing by ventilation, fluids, e.g. exuded by contents; Applications of corrosion inhibitors or desiccators for absorbing gases, e.g. oxygen absorbers or desiccants
- B65D81/267—Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants with provision for draining away, or absorbing, or removing by ventilation, fluids, e.g. exuded by contents; Applications of corrosion inhibitors or desiccators for absorbing gases, e.g. oxygen absorbers or desiccants the absorber being in sheet form
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D51/00—Closures not otherwise provided for
- B65D51/24—Closures not otherwise provided for combined or co-operating with auxiliary devices for non-closing purposes
- B65D51/244—Closures not otherwise provided for combined or co-operating with auxiliary devices for non-closing purposes provided with oxygen absorbers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D53/00—Sealing or packing elements; Sealings formed by liquid or plastics material
- B65D53/04—Discs
Abstract
A sealing disc for a closure cap for containers, in particular for bottle closures for substances, alcoholic drinks or wines which react with oxygen, comprises a layer 5 of an oxygen-tight substance and a layer 6 of a deoxidizing substance on the side of the sealing disc 3 which is to face the container contents.
Description
CA 02203744 1997-04-2~
Sealing disc for a closure cap for CQntA; ne~s The invention relates to a sealing element in the form of a disc or washer for a closure cap for containers, in particular for bottle closures for substances, alcoholic drinks or wines which react with oxygen.
There are various known embodiments of sealing discs. They are produced in appropriate sizes for use in bottle closures, for example with diameters of 16.6 to 45.0 mm or 12.0 to 115.0 mm. The small sealing discs are inserted in, for example, aluminium closure caps, the larger ones in plastic closure caps of screw-type closures for bottles.
It is known from US Patent 4,818,577 and US Patent 4,930,646 to provide a sealing disc consisting of a top layer of polyethylene foam and a layer disposed underneath of "Saran", i.e. a polyvinylidene chloride. The object of this is to achieve a barrier effect against the emergence of gaseous constituents from the inside of the bottle.
It is known from German Utility Model 72 40 238 to produce a sealing disc from a layer of polyolefin foam, in particular polyethylene foam, and a layer of a gastight plastics material, in particular a composite layer of polyethylene terephthalate and polyvinyl chloride (PVC). The latter layer is disposed as a diffusion barrier with the PVC layer towards the container opening so as not to form a barrier against the emergence of gas, for example carbon dioxide, and prevent the diffusion of oxygen into a container.
European Patent Application 0 332 725 discloses a sealing disc cast into a closure of polyolefin, for example polypropylene, with a layer of an organosol facing the container contents, above this a metal foil, a layer of polyolefin carboxylic acid and a layer of a thermoplastic polyolefin, for example polypropylene. This sealing disc is supposed to be heat-resistant and resistant to pasteurisation and allow fluids to pass through, and be particularly suitable for filling under vacuum and pressure.
CA 02203744 1997-04-2~
The use of corks to close wine or champagne bottles is known. An enclosure consisting of lead or tin was previously in most cases pulled over the corks. The lead is now usually replaced by an aluminium layer or a PVC shrink-on cap. The use of corks to close wine or champagne bottles often proves to have disadvantages, as mould-like bacteria form at the bottom edge of the cork on the side facing the wine or champagne. This phenomenon has a significant detrimental effect on the quality of the wine or champagne. Moreover, the use of corks to close wine or champagne bottles, at current prices of DM 200 per 1000 for high-quality corks, is a cost factor which cannot be ignored. It is for this reason, and reasons regarding easier opening and the possibility of re-closing bottles, that there has been an increasing tendency in recent years also to use aluminium screw-type closures for wine bottles. The sealing discs consist of polyethylene foam, for example.
The object of the invention is to provide a relatively inexpensive sealing disc for a closure cap for containers, in particular for bottle closures for substances, alcoholic drinks or wines which react with oxygen, which avoids the described disadvantages of known corks and reliably protects the container contents against degradation, particularly due to oxygen also trapped in the container.
According to a first aspect of the present invention, there is provided a sealing disc for a closure cap for containers of substances which react with oxygen, the sealing disc comprising a layer of an oxygen-tight substance and a layer of a deoxidizing substance on the side of the sealing disc which is to face the container contents.
According to a second aspect of the present invention, there is provided a process for producing a sealing disc, wherein the underside of a first layer of polyethylene foam is covered over its entire surface with a second layer of an oxygen-tight substance and bonded thereto, a third layer of a deoxidizing substance is applied to or foamed onto the underside of the second CA 02203744 1997-04-2~
layer and bonded thereto, the sealing disc is inserted with the surface of the first layer in a closure cap or fitted with the underside of the third layer on a container or inserted in a container mouth, and, as a result of loading the closure cap when it is rolled onto or otherwise secured to the container, the sealing disc is compressed to a thickness which is less than its production thickness.
There is thus provided a sealing disc, in particular for bottle closures for substances, alcoholic drinks or wines which react with oxygen, which on the one hand prevents, for example, the gaseous alcohol constituent contained in the alcoholic drink or wine from passing out through the sealing disc and on the other prevents oxygen or other unwanted gases from entering the bottle.
A quantity of oxygen inevitably also trapped between the bottle contents and the closure upon closing the bottles is absorbed by the deoxidizing substance, for example Daraform. The constituent which makes an opened wine unpalatable after a short time is thus removed from the unopened wine bottle. The wine therefore keeps longer and is not subject to any degradation. Together with the storage time and temperature, the effect of oxygen on the wine may lead to undesirable changes in the taste of the wine. The addition of sulphur to wine, which normally gives rise to general concern, increasingly in terms of health, can then be reduced or dispensed with entirely. The sealing disc also contributes to efforts on the part of, for example, the European Community to improve hygiene.
No bacteria which, like those on conventional corks, are on the European prohibited list can settle on it.
The distinct cost advantage, with improved efficiency, in relation to corks should also be emphasised.
Generally speaking, a sealing disc for a closure cap for containers, in particular for bottle closures for substances, alcoholic drinks or wines which react with oxygen, is provided which comprises a layer of an oxygen-tight substance and a layer of a deoxidizing substance on the side of the sealing disc which is to face the container contents.
CA 02203744 1997-04-2~
It preferably comprises another layer of polyethylene foam above the layer of the oxygen-tight substance. The sealing disc is advantageously covered by an aluminium screw-type closure on the side of its first layer of polyethylene foam. The underside of the polyethylene layer is covered over its entire surface by the layer of the oxygen-tight substance, preferably polyvinylidene chloride. The underside of the layer of the oxygen-tight substance is covered by the layer of a deoxidizing substance. The underside of the layer of the deoxidizing substance faces the container contents.
The deoxidizing substance is preferably of the type which only acts in this capacity under certain external conditions, for example under pressure or when the ambient moisture content is at a certain level. This enables the sealing disc to be handled, produced, stored and fitted under normal external conditions and thus with the usual oxygen present in the ambient air. The deoxidizing effect only develops in the filled container due to the resulting pressure above atmospheric and/or moisture content.
The deoxidizing layer advantageously comprises the deoxidizing substance polyolefin carboxylic acid, especially as a copolymer together with other polyolefins. A product marketed under the trade name Daraform is particularly suitable. Ethylenevinyl alcohol copolymer or another material of this kind may alternatively be used. The Daraform layer is rendered extrudable so that it can be applied to the polyvinylidene chloride layer. It thus has a clean, firm consistency.
Daraform cannot be faulted from the sensory aspect, i.e. there is 3U no effect in terms of taste on the contents of the bottle, and hence particularly the wine, which also remains unimpaired in other respects - for example visually.
The layer of polyethylene foam preferably has a density of 250 g/m2 and a thickness of 2 mm, the layer of polyvinylidene chloride preferably a thickness of 19 um and the layer of Daraform a thickness of 0.25 to 0.5 mm.
CA 02203744 1997-04-2~
The sealing disc is produced in a process in which the underside of the first layer of polyethylene foam is firstly covered over its entire surface with the second layer of an oxygen-tight substance and bonded thereto. The third layer of a deoxidizing substance is then applied to or foamed onto the underside of the second layer and bonded thereto.
The sealing disc can either be fitted in the closure cap before the aluminium screw-type closure is screwed down or secured to the container edge by the underside of the third layer in another way.
It may, for example, also be firstly placed on a bottle neck opening, particularly with the third layer inserted in the container mouth, after which the aluminium screw-type closure can be pulled over it. A load in the form of a compressive load is applied when the aluminium screw-type closure is screwed down, rolled onto or otherwise secured to the bottle neck. The sealing disc is thus compressed to a thickness which is less than the production thickness.
It is particularly preferable for the layer of a deoxidizing substance to have a smaller surface diameter than the other layers of the sealing disc, in particular a surface diameter which is smaller than the inside diameter of the associated container mouth which is to be sealed.
The additional advantage of this lies in the fact that, after the container closure with the sealing disc has been applied, the layer with the deoxidizing substance only comes into contact with the container contents, or the gaseous fraction below the closure, not with the ambient atmosphere, which could otherwise still reach the edge of this layer within the closure to a certain degree.
The polyvinylidene chloride layer performs a dual function.
Firstly, it prevents gaseous constituents such as alcohol, for example, from passing outwards from the inside of the bottle through the sealing disc. Secondly, it prevents oxygen or other gases from entering the region of the Daraform layer. By means of a compressive force (with elastic recovery), the polyethylene foam CA 02203744 1997-04-2~
layer which is preferably provided over the polyvinylidene chloride layer provides the appropriate clamping pressure and thus a seal. Tolerances of the closures and bottle necks are compensated by the thickness of the layer and the elastic formation thereof. Any fluid (also in vapour form) which could penetrate into the bottle from outside, for example, is thus prevented from doing so. Moreover, because it is substantially thicker than the other two layers, the polyethylene foam layer makes the sealing disc stable and particularly easy to handle.
In order to illustrate the invention further, several embodiments of sealing discs will now be described with reference to the drawings, in which:
Figure 1 is a perspective view of a bottle with a closure cap comprising a sealing disc according to the invention;
Figure 2 is a perspective view of the sealing disc according to the invention which is shown in Figure 1;
Figure 3 is a perspective view of a second embodiment of a sealing disc according to the invention; and Figure 4 is a sectional view of a third embodiment of a sealing disc according to the invention.
Figure 1 is a perspective view of a bottle 1 with a closure cap 2 comprising a sealing disc 3. The closure cap 2 is a screw-type closure. It is shown broken open in part to illustrate the internal sealing disc 3. The closure cap 2 is made of aluminium, for example.
The sealing disc 3 consists of three layers. The top layer 4, which is connected to the closure cap 2, is made of polyethylene foam. A layer 5 of polyvinylidene chloride is provided below the layer 4. A layer 6 of a deoxidizing substance, for example Daraform, is provided below the layer 5 and thus directly adjacent to the bottle neck edge and resting on its opening.
CA 02203744 1997-04-2~
The layer 6 of Daraform removes from the closed bottle the oxygen which is also introduced into the bottle when the latter is filled with the alcoholic drink, for example, in particular wine. The oxygen which is also trapped when using conventional wine bottle closures, in particular corks, although also twist closures with conventional sealing discs, may cause the wine to "turn~. It may in any case change the taste of the wine. The Daraform layer 6 removes this oxygen and thus enables the quality of the bottle contents, in particular wine, to be preserved.
The action of covering the layer 6 of Daraform by the layer 5 of polyvinylidene chloride ensures that the Daraform layer 6 only absorbs oxygen from below, i.e. from the inside of the bottle, and not from outside from the area around the bottle. The quantity of oxygen which is thus withdrawn and absorbed can therefore be ascertained and is relatively slight. The purpose of the Daraform layer 6 is not therefore to remove from a bottle which has been opened and then re-closed the oxygen which has penetrated upon opening and partly emptying the latter or to preserve the bottle contents, but rather just to absorb the oxygen originally penetrating when the bottle is filled, as well as any oxygen still escaping from the wine.
The layer 5 of polyvinylidene chloride thus prevents gas from passing into the inside of the bottle and from the latter to the outside. It is in particular impossible for the alcohol to escape from the inside of the bottle as a gaseous constituent. Oxygen from the area around the bottle cannot pass inwards into the region of the Daraform layer or through this.
The layer 4 of polyethylene foam serves on one hand as a means for connecting the two other layers to the closure cap 2. It is, however, also possible to select a layer of a different material with corresponding properties instead of the polyethylene foam layer.
Figure 2 is a perspective view of the sealing disc 3 according to the invention which is shown in Figure 1. The top layer 4 of polyethylene foam has a density of, for example, 250 g/m2. The CA 02203744 l997-04-2~
layer is approximately 2 mm thick. The top surface 7 of the layer 4 of polyethylene foam bears directly against the inside of the closure cap 2 after being inserted in the latter and is held in a retaining bead in the closure. However it may also be secured in the closure by means of an adhesive. The layer's own adhesive or bonding action is in some cases sufficient to secure it in the closure cap 2.
The layer 4 of polyethylene foam is covered over the entire surface of its underside 8 by the middle layer 5 of polyvinylidene chloride. Polyvinylidene chloride is a double chloride compound, which is also called PVDC film. The company Dow Chemical produces polyvinylidene chloride under the trade name "Saran". The layer 5 of polyvinylidene chloride is of a thickness of, for example, 19 um. This very slight thickness of the layer 5 is sufficient to develop the barrier effect, in particular for the gaseous alcohol and against the entrance of the gaseous oxygen.
The bottom layer 6 of the deoxidizing substance Daraform is provided at the underside 9 of the layer 5. The product name Daraform of the company Grace Chemicals designates in chemical terms a mixture of polyolefin carboxylic acid with other polyolefins, also prepared as copolymers. Daraform is entirely PVC-free and binds oxygen. The third layer 6 of Daraform is approximately 0.25 mm or 0.5 mm thick, for example. In order to apply it to the underside 9 of the middle layer 5 of polyvinylidene chloride, the bottom layer 6 is extruded from Daraform. This gives it a clean, firm consistency.
After the three layers 4, 5, 6 have been joined together, the overall thickness of the sealing disc 3 is approximately 2.3 mm.
The sealing disc 3 is either firstly inserted in a prefabricated aluminium closure cap 2 in which it is secured or clamped in place. The three layers 4, 5, 6 of the sealing disc 3 already adhere to one another in this case. If the aluminium closure cap 2 is rolled on or otherwise secured to the bottle neck, this cap is additionally subjected to a load of 120 to 180 kg. The sealing disc 3 lying in the closure is as a result compressed to a thickness of approximately 1 mm. The inside of the bottle is ~ CA 02203744 1997-04-2~
thereby hermetically sealed by means of the sealing disc 3 and the closure cap 2.
According to the field of application of the sealing disc 3, it may be advisable to make the Daraform layer 6 of a thickness other than that specified. The sealing disc 3 is not only suitable for closures for wine bottles or other alcoholic drinks, but for all cases in which the inside of a container with trapped, unwanted oxygen is to be deoxidized.
The underside 10 of the bottom layer 6 of Daraform is directly in contact with the inside of the bottle and thus the oxygen trapped in the latter. Daraform is resistant to alcohol, tartaric acid and other substances which are used in the food sector and, moreover, cannot be faulted from the sensory aspect. If a deoxidizing substance other than Daraform is used, there should be no possibility of this other substance being affected by the contents of the bottle. Where wine bottles are concerned, the substance should therefore be resistant to alcohol and tartaric acid, for example.
Figure 3 is a perspective view of a second embodiment of a sealing disc 3 according to the invention. The sealing disc 3 comprises a top layer 5 of polyvinylidene chloride and a bottom layer 6 of a deoxidizing substance, for example Daraform. Although the sealing disc 3 could be produced just from Daraform, this would be comparatively expensive, as Daraform costs many times as much as polyethylene foam. Apart from this consideration, this single layer of Daraform would not only absorb the oxygen from inside the bottle, but also draw in and absorb the oxygen from the area around the bottle. It is therefore far better to cover the top surface 13 of the Daraform layer 6 with the barrier layer of polyvinylidene chloride. A closure cap 2 can then also be provided directly over this layer 5 of polyvinylidene chloride.
Figure 4 is a sectional view of a third embodiment of a sealing disc 3 according to the invention. Here a middle layer 5 of polyvinylidene chloride can be seen below the top layer 4 of polyethylene foam and, beneath this middle layer 5, a bottom layer 6 of Daraform. Whereas the layers 4 and 5 have the same surface diameter, the layer 6 is smaller.
If the disc is now imagined to be in a closure cap and this on a container mouth as in Figure 1, for example, the layer 6 of Daraform projects slightly below the container mouth into the container, while the layer 5 lies exactly on the container mouth.
Together with the container, this prevents any oxygen from entering, so that the layer 6 is only confronted with the oxygen inside the container.
List of reference ~-rs 1 bottle 2 closure cap 3 sealing disc 4 layer of polyethylene foam layer of polyvinylidene chloride 6 layer of deoxidizing substance/Daraform 7 top surface 8 underside underside underside 13 top surface
Sealing disc for a closure cap for CQntA; ne~s The invention relates to a sealing element in the form of a disc or washer for a closure cap for containers, in particular for bottle closures for substances, alcoholic drinks or wines which react with oxygen.
There are various known embodiments of sealing discs. They are produced in appropriate sizes for use in bottle closures, for example with diameters of 16.6 to 45.0 mm or 12.0 to 115.0 mm. The small sealing discs are inserted in, for example, aluminium closure caps, the larger ones in plastic closure caps of screw-type closures for bottles.
It is known from US Patent 4,818,577 and US Patent 4,930,646 to provide a sealing disc consisting of a top layer of polyethylene foam and a layer disposed underneath of "Saran", i.e. a polyvinylidene chloride. The object of this is to achieve a barrier effect against the emergence of gaseous constituents from the inside of the bottle.
It is known from German Utility Model 72 40 238 to produce a sealing disc from a layer of polyolefin foam, in particular polyethylene foam, and a layer of a gastight plastics material, in particular a composite layer of polyethylene terephthalate and polyvinyl chloride (PVC). The latter layer is disposed as a diffusion barrier with the PVC layer towards the container opening so as not to form a barrier against the emergence of gas, for example carbon dioxide, and prevent the diffusion of oxygen into a container.
European Patent Application 0 332 725 discloses a sealing disc cast into a closure of polyolefin, for example polypropylene, with a layer of an organosol facing the container contents, above this a metal foil, a layer of polyolefin carboxylic acid and a layer of a thermoplastic polyolefin, for example polypropylene. This sealing disc is supposed to be heat-resistant and resistant to pasteurisation and allow fluids to pass through, and be particularly suitable for filling under vacuum and pressure.
CA 02203744 1997-04-2~
The use of corks to close wine or champagne bottles is known. An enclosure consisting of lead or tin was previously in most cases pulled over the corks. The lead is now usually replaced by an aluminium layer or a PVC shrink-on cap. The use of corks to close wine or champagne bottles often proves to have disadvantages, as mould-like bacteria form at the bottom edge of the cork on the side facing the wine or champagne. This phenomenon has a significant detrimental effect on the quality of the wine or champagne. Moreover, the use of corks to close wine or champagne bottles, at current prices of DM 200 per 1000 for high-quality corks, is a cost factor which cannot be ignored. It is for this reason, and reasons regarding easier opening and the possibility of re-closing bottles, that there has been an increasing tendency in recent years also to use aluminium screw-type closures for wine bottles. The sealing discs consist of polyethylene foam, for example.
The object of the invention is to provide a relatively inexpensive sealing disc for a closure cap for containers, in particular for bottle closures for substances, alcoholic drinks or wines which react with oxygen, which avoids the described disadvantages of known corks and reliably protects the container contents against degradation, particularly due to oxygen also trapped in the container.
According to a first aspect of the present invention, there is provided a sealing disc for a closure cap for containers of substances which react with oxygen, the sealing disc comprising a layer of an oxygen-tight substance and a layer of a deoxidizing substance on the side of the sealing disc which is to face the container contents.
According to a second aspect of the present invention, there is provided a process for producing a sealing disc, wherein the underside of a first layer of polyethylene foam is covered over its entire surface with a second layer of an oxygen-tight substance and bonded thereto, a third layer of a deoxidizing substance is applied to or foamed onto the underside of the second CA 02203744 1997-04-2~
layer and bonded thereto, the sealing disc is inserted with the surface of the first layer in a closure cap or fitted with the underside of the third layer on a container or inserted in a container mouth, and, as a result of loading the closure cap when it is rolled onto or otherwise secured to the container, the sealing disc is compressed to a thickness which is less than its production thickness.
There is thus provided a sealing disc, in particular for bottle closures for substances, alcoholic drinks or wines which react with oxygen, which on the one hand prevents, for example, the gaseous alcohol constituent contained in the alcoholic drink or wine from passing out through the sealing disc and on the other prevents oxygen or other unwanted gases from entering the bottle.
A quantity of oxygen inevitably also trapped between the bottle contents and the closure upon closing the bottles is absorbed by the deoxidizing substance, for example Daraform. The constituent which makes an opened wine unpalatable after a short time is thus removed from the unopened wine bottle. The wine therefore keeps longer and is not subject to any degradation. Together with the storage time and temperature, the effect of oxygen on the wine may lead to undesirable changes in the taste of the wine. The addition of sulphur to wine, which normally gives rise to general concern, increasingly in terms of health, can then be reduced or dispensed with entirely. The sealing disc also contributes to efforts on the part of, for example, the European Community to improve hygiene.
No bacteria which, like those on conventional corks, are on the European prohibited list can settle on it.
The distinct cost advantage, with improved efficiency, in relation to corks should also be emphasised.
Generally speaking, a sealing disc for a closure cap for containers, in particular for bottle closures for substances, alcoholic drinks or wines which react with oxygen, is provided which comprises a layer of an oxygen-tight substance and a layer of a deoxidizing substance on the side of the sealing disc which is to face the container contents.
CA 02203744 1997-04-2~
It preferably comprises another layer of polyethylene foam above the layer of the oxygen-tight substance. The sealing disc is advantageously covered by an aluminium screw-type closure on the side of its first layer of polyethylene foam. The underside of the polyethylene layer is covered over its entire surface by the layer of the oxygen-tight substance, preferably polyvinylidene chloride. The underside of the layer of the oxygen-tight substance is covered by the layer of a deoxidizing substance. The underside of the layer of the deoxidizing substance faces the container contents.
The deoxidizing substance is preferably of the type which only acts in this capacity under certain external conditions, for example under pressure or when the ambient moisture content is at a certain level. This enables the sealing disc to be handled, produced, stored and fitted under normal external conditions and thus with the usual oxygen present in the ambient air. The deoxidizing effect only develops in the filled container due to the resulting pressure above atmospheric and/or moisture content.
The deoxidizing layer advantageously comprises the deoxidizing substance polyolefin carboxylic acid, especially as a copolymer together with other polyolefins. A product marketed under the trade name Daraform is particularly suitable. Ethylenevinyl alcohol copolymer or another material of this kind may alternatively be used. The Daraform layer is rendered extrudable so that it can be applied to the polyvinylidene chloride layer. It thus has a clean, firm consistency.
Daraform cannot be faulted from the sensory aspect, i.e. there is 3U no effect in terms of taste on the contents of the bottle, and hence particularly the wine, which also remains unimpaired in other respects - for example visually.
The layer of polyethylene foam preferably has a density of 250 g/m2 and a thickness of 2 mm, the layer of polyvinylidene chloride preferably a thickness of 19 um and the layer of Daraform a thickness of 0.25 to 0.5 mm.
CA 02203744 1997-04-2~
The sealing disc is produced in a process in which the underside of the first layer of polyethylene foam is firstly covered over its entire surface with the second layer of an oxygen-tight substance and bonded thereto. The third layer of a deoxidizing substance is then applied to or foamed onto the underside of the second layer and bonded thereto.
The sealing disc can either be fitted in the closure cap before the aluminium screw-type closure is screwed down or secured to the container edge by the underside of the third layer in another way.
It may, for example, also be firstly placed on a bottle neck opening, particularly with the third layer inserted in the container mouth, after which the aluminium screw-type closure can be pulled over it. A load in the form of a compressive load is applied when the aluminium screw-type closure is screwed down, rolled onto or otherwise secured to the bottle neck. The sealing disc is thus compressed to a thickness which is less than the production thickness.
It is particularly preferable for the layer of a deoxidizing substance to have a smaller surface diameter than the other layers of the sealing disc, in particular a surface diameter which is smaller than the inside diameter of the associated container mouth which is to be sealed.
The additional advantage of this lies in the fact that, after the container closure with the sealing disc has been applied, the layer with the deoxidizing substance only comes into contact with the container contents, or the gaseous fraction below the closure, not with the ambient atmosphere, which could otherwise still reach the edge of this layer within the closure to a certain degree.
The polyvinylidene chloride layer performs a dual function.
Firstly, it prevents gaseous constituents such as alcohol, for example, from passing outwards from the inside of the bottle through the sealing disc. Secondly, it prevents oxygen or other gases from entering the region of the Daraform layer. By means of a compressive force (with elastic recovery), the polyethylene foam CA 02203744 1997-04-2~
layer which is preferably provided over the polyvinylidene chloride layer provides the appropriate clamping pressure and thus a seal. Tolerances of the closures and bottle necks are compensated by the thickness of the layer and the elastic formation thereof. Any fluid (also in vapour form) which could penetrate into the bottle from outside, for example, is thus prevented from doing so. Moreover, because it is substantially thicker than the other two layers, the polyethylene foam layer makes the sealing disc stable and particularly easy to handle.
In order to illustrate the invention further, several embodiments of sealing discs will now be described with reference to the drawings, in which:
Figure 1 is a perspective view of a bottle with a closure cap comprising a sealing disc according to the invention;
Figure 2 is a perspective view of the sealing disc according to the invention which is shown in Figure 1;
Figure 3 is a perspective view of a second embodiment of a sealing disc according to the invention; and Figure 4 is a sectional view of a third embodiment of a sealing disc according to the invention.
Figure 1 is a perspective view of a bottle 1 with a closure cap 2 comprising a sealing disc 3. The closure cap 2 is a screw-type closure. It is shown broken open in part to illustrate the internal sealing disc 3. The closure cap 2 is made of aluminium, for example.
The sealing disc 3 consists of three layers. The top layer 4, which is connected to the closure cap 2, is made of polyethylene foam. A layer 5 of polyvinylidene chloride is provided below the layer 4. A layer 6 of a deoxidizing substance, for example Daraform, is provided below the layer 5 and thus directly adjacent to the bottle neck edge and resting on its opening.
CA 02203744 1997-04-2~
The layer 6 of Daraform removes from the closed bottle the oxygen which is also introduced into the bottle when the latter is filled with the alcoholic drink, for example, in particular wine. The oxygen which is also trapped when using conventional wine bottle closures, in particular corks, although also twist closures with conventional sealing discs, may cause the wine to "turn~. It may in any case change the taste of the wine. The Daraform layer 6 removes this oxygen and thus enables the quality of the bottle contents, in particular wine, to be preserved.
The action of covering the layer 6 of Daraform by the layer 5 of polyvinylidene chloride ensures that the Daraform layer 6 only absorbs oxygen from below, i.e. from the inside of the bottle, and not from outside from the area around the bottle. The quantity of oxygen which is thus withdrawn and absorbed can therefore be ascertained and is relatively slight. The purpose of the Daraform layer 6 is not therefore to remove from a bottle which has been opened and then re-closed the oxygen which has penetrated upon opening and partly emptying the latter or to preserve the bottle contents, but rather just to absorb the oxygen originally penetrating when the bottle is filled, as well as any oxygen still escaping from the wine.
The layer 5 of polyvinylidene chloride thus prevents gas from passing into the inside of the bottle and from the latter to the outside. It is in particular impossible for the alcohol to escape from the inside of the bottle as a gaseous constituent. Oxygen from the area around the bottle cannot pass inwards into the region of the Daraform layer or through this.
The layer 4 of polyethylene foam serves on one hand as a means for connecting the two other layers to the closure cap 2. It is, however, also possible to select a layer of a different material with corresponding properties instead of the polyethylene foam layer.
Figure 2 is a perspective view of the sealing disc 3 according to the invention which is shown in Figure 1. The top layer 4 of polyethylene foam has a density of, for example, 250 g/m2. The CA 02203744 l997-04-2~
layer is approximately 2 mm thick. The top surface 7 of the layer 4 of polyethylene foam bears directly against the inside of the closure cap 2 after being inserted in the latter and is held in a retaining bead in the closure. However it may also be secured in the closure by means of an adhesive. The layer's own adhesive or bonding action is in some cases sufficient to secure it in the closure cap 2.
The layer 4 of polyethylene foam is covered over the entire surface of its underside 8 by the middle layer 5 of polyvinylidene chloride. Polyvinylidene chloride is a double chloride compound, which is also called PVDC film. The company Dow Chemical produces polyvinylidene chloride under the trade name "Saran". The layer 5 of polyvinylidene chloride is of a thickness of, for example, 19 um. This very slight thickness of the layer 5 is sufficient to develop the barrier effect, in particular for the gaseous alcohol and against the entrance of the gaseous oxygen.
The bottom layer 6 of the deoxidizing substance Daraform is provided at the underside 9 of the layer 5. The product name Daraform of the company Grace Chemicals designates in chemical terms a mixture of polyolefin carboxylic acid with other polyolefins, also prepared as copolymers. Daraform is entirely PVC-free and binds oxygen. The third layer 6 of Daraform is approximately 0.25 mm or 0.5 mm thick, for example. In order to apply it to the underside 9 of the middle layer 5 of polyvinylidene chloride, the bottom layer 6 is extruded from Daraform. This gives it a clean, firm consistency.
After the three layers 4, 5, 6 have been joined together, the overall thickness of the sealing disc 3 is approximately 2.3 mm.
The sealing disc 3 is either firstly inserted in a prefabricated aluminium closure cap 2 in which it is secured or clamped in place. The three layers 4, 5, 6 of the sealing disc 3 already adhere to one another in this case. If the aluminium closure cap 2 is rolled on or otherwise secured to the bottle neck, this cap is additionally subjected to a load of 120 to 180 kg. The sealing disc 3 lying in the closure is as a result compressed to a thickness of approximately 1 mm. The inside of the bottle is ~ CA 02203744 1997-04-2~
thereby hermetically sealed by means of the sealing disc 3 and the closure cap 2.
According to the field of application of the sealing disc 3, it may be advisable to make the Daraform layer 6 of a thickness other than that specified. The sealing disc 3 is not only suitable for closures for wine bottles or other alcoholic drinks, but for all cases in which the inside of a container with trapped, unwanted oxygen is to be deoxidized.
The underside 10 of the bottom layer 6 of Daraform is directly in contact with the inside of the bottle and thus the oxygen trapped in the latter. Daraform is resistant to alcohol, tartaric acid and other substances which are used in the food sector and, moreover, cannot be faulted from the sensory aspect. If a deoxidizing substance other than Daraform is used, there should be no possibility of this other substance being affected by the contents of the bottle. Where wine bottles are concerned, the substance should therefore be resistant to alcohol and tartaric acid, for example.
Figure 3 is a perspective view of a second embodiment of a sealing disc 3 according to the invention. The sealing disc 3 comprises a top layer 5 of polyvinylidene chloride and a bottom layer 6 of a deoxidizing substance, for example Daraform. Although the sealing disc 3 could be produced just from Daraform, this would be comparatively expensive, as Daraform costs many times as much as polyethylene foam. Apart from this consideration, this single layer of Daraform would not only absorb the oxygen from inside the bottle, but also draw in and absorb the oxygen from the area around the bottle. It is therefore far better to cover the top surface 13 of the Daraform layer 6 with the barrier layer of polyvinylidene chloride. A closure cap 2 can then also be provided directly over this layer 5 of polyvinylidene chloride.
Figure 4 is a sectional view of a third embodiment of a sealing disc 3 according to the invention. Here a middle layer 5 of polyvinylidene chloride can be seen below the top layer 4 of polyethylene foam and, beneath this middle layer 5, a bottom layer 6 of Daraform. Whereas the layers 4 and 5 have the same surface diameter, the layer 6 is smaller.
If the disc is now imagined to be in a closure cap and this on a container mouth as in Figure 1, for example, the layer 6 of Daraform projects slightly below the container mouth into the container, while the layer 5 lies exactly on the container mouth.
Together with the container, this prevents any oxygen from entering, so that the layer 6 is only confronted with the oxygen inside the container.
List of reference ~-rs 1 bottle 2 closure cap 3 sealing disc 4 layer of polyethylene foam layer of polyvinylidene chloride 6 layer of deoxidizing substance/Daraform 7 top surface 8 underside underside underside 13 top surface
Claims (12)
1. A sealing disc for a closure cap for containers of substances which react with oxygen, the sealing disc comprising a layer of an oxygen-tight substance and a layer of a deoxidizing substance on the side of the sealing disc which is to face the container contents.
2. A sealing disc according to claim 1, wherein the layer of the oxygen-tight substance consists of polyvinylidene chloride.
3. A sealing disc according to claim 2, wherein the layer of polyvinylidene chloride has a thickness of 19 µm,
4. A sealing disc according to claim 1, wherein the layer of deoxidizing substance contains polyolefin carboxylic acid.
5. A sealing disc according to claim 4, wherein the polyolefin carboxylic acid is in the form of a copolymer together with other polyolefins.
6. A sealing disc according to claim 1, wherein a layer of polyethylene foam is provided above the layer of the oxygen-tight substance.
7. A sealing disc according to claim 6, wherein the layer of polyethylene foam, as the top layer, is covered by the closure cap, the layer of the oxygen-tight substance covers the entire surface of the underside of the layer of polyethylene foam, and the layer of deoxidizing substance covers the underside of the layer of the oxygen-tight substance and its underside faces the contents of the container.
8. A sealing disc according to claim 6, wherein the layer of polyethylene foam has a density of 250 g/m2 and a thickness of 2 mm.
9. A sealing disc according to claim 1, wherein the layer of deoxidizing substance has a smaller surface diameter than the other layers of the sealing disc, in particular a surface diameter which is smaller than the inside diameter of the associated container mouth which is to be sealed.
10. A sealing disc according to claim 1, wherein the layer of deoxidizing substance consists of Daraform and has a thickness of 0.25 to 0.5 mm.
11. A bottle for alcoholic drinks or wines having a sealing disc according to any preceding claim.
12. A process for producing a sealing disc, wherein the underside of a first layer of polyethylene foam is covered over its entire surface with a second layer of an oxygen-tight substance and bonded thereto, a third layer of a deoxidizing substance is applied to or foamed onto the underside of the second layer and bonded thereto, the sealing disc is inserted with the surface of the first layer in a closure cap or fitted with the underside of the third layer on a container or inserted in a container mouth, and, as a result of loading the closure cap when it is rolled onto or otherwise secured to the container, the sealing disc is compressed to a thickness which is less than its production thickness.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19616616.0 | 1996-04-25 | ||
| DE19616616A DE19616616C2 (en) | 1996-04-25 | 1996-04-25 | Sealing disc for a closure cap for containers |
| DE19624039.5 | 1996-06-17 | ||
| DE1996124039 DE19624039A1 (en) | 1996-06-17 | 1996-06-17 | Sealing washer for sealing cap of container, especially alcoholic drinks bottle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2203744A1 true CA2203744A1 (en) | 1997-10-25 |
Family
ID=26025134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002203744A Abandoned CA2203744A1 (en) | 1996-04-25 | 1997-04-25 | Sealing disc for a closure cap for containers |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0803445B1 (en) |
| AU (1) | AU716641B2 (en) |
| CA (1) | CA2203744A1 (en) |
| DE (1) | DE59711015D1 (en) |
| ES (1) | ES2208781T3 (en) |
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|---|---|---|---|---|
| US9624008B2 (en) | 2007-03-23 | 2017-04-18 | Selig Sealing Products, Inc. | Container seal with removal tab and security ring seal |
| US9815589B2 (en) | 2005-01-06 | 2017-11-14 | Selig Sealing Products, Inc. | Tabbed sealing member with improved heat distribution for a container |
| US9994357B2 (en) | 2013-03-15 | 2018-06-12 | Selig Sealing Products, Inc. | Inner seal with a sub tab layer |
| US10000310B2 (en) | 2013-03-15 | 2018-06-19 | Selig Sealing Products, Inc. | Inner seal with an overlapping partial tab layer |
| US10196174B2 (en) | 2012-09-05 | 2019-02-05 | Selig Sealing Products, Inc. | Tamper evident tabbed sealing member having a foamed polymer layer |
| US10556732B2 (en) | 2015-03-03 | 2020-02-11 | Selig Sealing Products, Inc. | Tabbed seal concepts |
| US10604315B2 (en) | 2014-02-05 | 2020-03-31 | Selig Sealing Products, Inc. | Dual aluminum tamper indicating tabbed sealing member |
| US10899506B2 (en) | 2016-10-28 | 2021-01-26 | Selig Sealing Products, Inc. | Single aluminum tamper indicating tabbed sealing member |
| US10934069B2 (en) | 2016-10-28 | 2021-03-02 | Selig Sealing Products, Inc. | Sealing member for use with fat containing compositions |
| US11254481B2 (en) | 2018-09-11 | 2022-02-22 | Selig Sealing Products, Inc. | Enhancements for tabbed seal |
| US11708198B2 (en) | 2018-07-09 | 2023-07-25 | Selig Sealing Products, Inc. | Grip enhancements for tabbed seal |
| US11866242B2 (en) | 2016-10-31 | 2024-01-09 | Selig Sealing Products, Inc. | Tabbed inner seal |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9909083D0 (en) * | 1999-04-21 | 1999-06-16 | Crown Cork & Seal Tech Corp | Closures for containers |
| FR2837173B1 (en) * | 2002-03-13 | 2004-05-28 | Tetra Laval Holdings & Finance | DEVICE FOR SEALING A CONTAINER AND CONTAINER PROVIDED WITH SUCH A DEVICE |
| US8057896B2 (en) | 2005-01-06 | 2011-11-15 | Selig Sealing Products, Inc. | Pull-tab sealing member with improved heat distribution for a container |
| EP1789260B1 (en) | 2005-04-15 | 2008-11-26 | Illinois Tool Works Inc. | Seal stock laminate |
| ES2326754T3 (en) | 2006-03-20 | 2009-10-19 | Selig Sealing Products, Inc. | CLOSURE LAMINATE FOR CONTAINERS. |
| DE102006030074B3 (en) * | 2006-06-28 | 2007-07-26 | Alfelder Kunststoffwerke Herm. Meyer Gmbh | Sealing disk for a container, e.g. holding foodstuffs or wine, has a layer fused to the opening by induction heat and a layer to absorb oxygen from the contents |
| ES2377333T3 (en) | 2006-12-20 | 2012-03-26 | Selig Sealing Products, Inc. | Stratified |
| US8522990B2 (en) | 2007-03-23 | 2013-09-03 | Selig Sealing Products, Inc. | Container seal with removal tab and holographic security ring seal |
| US8703265B2 (en) | 2007-03-23 | 2014-04-22 | Selig Sealing Products, Inc. | Container seal with removal tab and piercable holographic security seal |
| DE602007002705D1 (en) | 2007-06-22 | 2009-11-19 | Selig Sealing Products Inc | Closure for a container |
| MX2010002223A (en) | 2007-08-24 | 2010-05-19 | Selig Sealing Products Inc | Multi-purpose covering and method of hygienically covering a container top. |
| WO2012135353A1 (en) | 2011-03-28 | 2012-10-04 | Selig Sealing Products, Inc. | Laminate structure to stabilize a dimensionally unstable layer |
| BR112013033296A8 (en) | 2011-06-24 | 2018-07-17 | Selig Sealing Products Inc | sealing member for sealing a container rim and for providing a dispensing opening and container having a sealing member for sealing a container rim and for providing a dispensing opening |
| US10259626B2 (en) | 2012-03-08 | 2019-04-16 | Selig Sealing Products, Inc. | Container sealing member with protected security component and removal tab |
| US9193513B2 (en) | 2012-09-05 | 2015-11-24 | Selig Sealing Products, Inc. | Tabbed inner seal |
| DE102013106966A1 (en) * | 2013-07-03 | 2015-01-22 | Alfelder Kunststoffwerke Herm. Meyer Gmbh | Sealing disk for a closure flap for containers, in particular bottles |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8803065D0 (en) * | 1988-02-10 | 1988-03-09 | Grace W R & Co | Container closure & materials for use in these |
| CA2062083C (en) * | 1991-04-02 | 2002-03-26 | Drew Ve Speer | Compositions, articles and methods for scavenging oxygen |
| GB9113584D0 (en) * | 1991-06-24 | 1991-08-14 | Bp Chem Int Ltd | Stabilised polymer composition and use |
| EP0656298B1 (en) * | 1993-11-19 | 1998-07-22 | Mitsubishi Gas Chemical Company, Inc. | Oxygen scavenger assembly for lids |
-
1997
- 1997-04-15 ES ES97106265T patent/ES2208781T3/en not_active Expired - Lifetime
- 1997-04-15 EP EP97106265A patent/EP0803445B1/en not_active Expired - Lifetime
- 1997-04-15 DE DE59711015T patent/DE59711015D1/en not_active Expired - Fee Related
- 1997-04-24 AU AU19079/97A patent/AU716641B2/en not_active Ceased
- 1997-04-25 CA CA002203744A patent/CA2203744A1/en not_active Abandoned
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|---|---|---|---|---|
| US9815589B2 (en) | 2005-01-06 | 2017-11-14 | Selig Sealing Products, Inc. | Tabbed sealing member with improved heat distribution for a container |
| US9624008B2 (en) | 2007-03-23 | 2017-04-18 | Selig Sealing Products, Inc. | Container seal with removal tab and security ring seal |
| US10196174B2 (en) | 2012-09-05 | 2019-02-05 | Selig Sealing Products, Inc. | Tamper evident tabbed sealing member having a foamed polymer layer |
| US10954032B2 (en) | 2012-09-05 | 2021-03-23 | Selig Sealing Products, Inc. | Tamper evident tabbed sealing member having a foamed polymer layer |
| US9994357B2 (en) | 2013-03-15 | 2018-06-12 | Selig Sealing Products, Inc. | Inner seal with a sub tab layer |
| US10000310B2 (en) | 2013-03-15 | 2018-06-19 | Selig Sealing Products, Inc. | Inner seal with an overlapping partial tab layer |
| US10150589B2 (en) | 2013-03-15 | 2018-12-11 | Selig Sealing Products, Inc. | Inner seal with a sub tab layer |
| US10150590B2 (en) | 2013-03-15 | 2018-12-11 | Selig Sealing Products, Inc. | Inner seal with a sub tab layer |
| US10604315B2 (en) | 2014-02-05 | 2020-03-31 | Selig Sealing Products, Inc. | Dual aluminum tamper indicating tabbed sealing member |
| US10556732B2 (en) | 2015-03-03 | 2020-02-11 | Selig Sealing Products, Inc. | Tabbed seal concepts |
| US11059644B2 (en) | 2015-03-03 | 2021-07-13 | Selig Sealing Products, Inc. | Tabbed seal concepts |
| US10899506B2 (en) | 2016-10-28 | 2021-01-26 | Selig Sealing Products, Inc. | Single aluminum tamper indicating tabbed sealing member |
| US10934069B2 (en) | 2016-10-28 | 2021-03-02 | Selig Sealing Products, Inc. | Sealing member for use with fat containing compositions |
| US11401080B2 (en) | 2016-10-28 | 2022-08-02 | Selig Sealing Products, Inc. | Single aluminum tamper indicating tabbed sealing member |
| US11866242B2 (en) | 2016-10-31 | 2024-01-09 | Selig Sealing Products, Inc. | Tabbed inner seal |
| US11708198B2 (en) | 2018-07-09 | 2023-07-25 | Selig Sealing Products, Inc. | Grip enhancements for tabbed seal |
| US11724863B2 (en) | 2018-07-09 | 2023-08-15 | Selig Sealing Products, Inc. | Tabbed seal with oversized tab |
| US11254481B2 (en) | 2018-09-11 | 2022-02-22 | Selig Sealing Products, Inc. | Enhancements for tabbed seal |
Also Published As
| Publication number | Publication date |
|---|---|
| AU1907997A (en) | 1997-10-30 |
| ES2208781T3 (en) | 2004-06-16 |
| EP0803445B1 (en) | 2003-11-19 |
| EP0803445A1 (en) | 1997-10-29 |
| AU716641B2 (en) | 2000-03-02 |
| DE59711015D1 (en) | 2003-12-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |