GB2025791A - Heat-sealing Covering Material - Google Patents
Heat-sealing Covering Material Download PDFInfo
- Publication number
- GB2025791A GB2025791A GB7839047A GB7839047A GB2025791A GB 2025791 A GB2025791 A GB 2025791A GB 7839047 A GB7839047 A GB 7839047A GB 7839047 A GB7839047 A GB 7839047A GB 2025791 A GB2025791 A GB 2025791A
- Authority
- GB
- United Kingdom
- Prior art keywords
- heat
- sealing
- covering material
- aluminum foil
- ethylene
- 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.)
- Granted
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 41
- 239000000463 material Substances 0.000 title claims abstract description 29
- 239000000203 mixture Substances 0.000 claims abstract description 37
- 229920000098 polyolefin Polymers 0.000 claims abstract description 29
- 229920001038 ethylene copolymer Polymers 0.000 claims abstract description 10
- 239000011888 foil Substances 0.000 claims description 33
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 30
- 229910052782 aluminium Inorganic materials 0.000 claims description 30
- 239000001993 wax Substances 0.000 claims description 13
- -1 polyethylene Polymers 0.000 claims description 12
- 239000004698 Polyethylene Substances 0.000 claims description 9
- 229920000573 polyethylene Polymers 0.000 claims description 9
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 8
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 6
- 229920001577 copolymer Polymers 0.000 claims description 5
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims description 4
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims description 4
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 4
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims description 4
- 229920012753 Ethylene Ionomers Polymers 0.000 claims description 2
- 239000012775 heat-sealing material Substances 0.000 claims description 2
- 239000004200 microcrystalline wax Substances 0.000 claims description 2
- 235000019808 microcrystalline wax Nutrition 0.000 claims description 2
- 239000012188 paraffin wax Substances 0.000 claims description 2
- 229920005670 poly(ethylene-vinyl chloride) Polymers 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims 2
- 239000005030 aluminium foil Substances 0.000 abstract 1
- 229920003002 synthetic resin Polymers 0.000 description 7
- 239000000057 synthetic resin Substances 0.000 description 7
- 238000001816 cooling Methods 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 230000001464 adherent effect Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000001976 improved effect Effects 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 241000186660 Lactobacillus Species 0.000 description 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 1
- 229940039696 lactobacillus Drugs 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000012860 organic pigment Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/35—Heat-activated
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Laminated Bodies (AREA)
Abstract
A heat-sealing covering material comprising an aluminium foil having a polyolefin layer formed on the underside thereof and a ethylene copolymer and wax heat-sealing composition layer formed on the underside of the polyolefin layer.
Description
SPECIFICATION
Heat-Sealing Covering Material
This invention relates to a heat-sealing covering material adapted to cover the mouths of synthetic resin bottles mainly and to be intimateiy adhered to the mouths by heating.
Bottles of synthetic resin are now widely used for milk, lactobacillus beverages, food oils and juices.
Heat-sealing covering materials for synthetic resin bottles are known which comprise an aluminum foil and a layer of thermoplastic synthetic resin such as polyethylene. However, these materials are not always amenable to heat sealing for use with bottles of some kind of material as is the case with polystyrene bottles. Conversely they are highly amenable to heat adhesion to polyethylene bottles, so that the aluminum foil alone is liable to be separated off when removing the cover to open the bottle, leaving the polyethylene layer on the bottle mouth. Another problem experienced with heat-sealing materials of the type described is that bottles made of synthetic resin of low softening point are prone to thermal deformation at the mouth portion when heat-sealed with the material.
This invention has overcome the foregoing problems and provides a heat-sealing covering material comprising an aluminum foil, a polyolefin layer formed on the lower surface of the aluminum foil and a layer of heat-sealing composition formed on the lower surface of the polyolefin layer, the heat-sealing composition consisting essentially of an ethylene copolymer and wax.
One feature of the present invention is that the heat-sealing composition consists essentially of an ethylene copolymer and a wax. The ethylene copolymer, which can be adhered to bottles of any synthetic resin, ensures the heat sealing of the bottle mouth. Examples of useful ethylene copolymers are ethylene-vinyl acetate copolymer, ethylene-vinyl chloride copolymer and ethylene-styrene copolymer, among which ethylene-vinyl acetate copolymer is economically advantageous to use. The proportion of ethylene copolymer in the heat-sealing composition is preferably 10 to 80% by weight, more preferably 20 to 40% by weight. With less than 10% by weight of the copolymer present, poor adhesion will result, whereas use of more than 80% by weight of the copolymer will not afford any improved adhesion.The wax acts to lower the melting point of the heat-sealing composition, thus permitting the heat sealing of bottle mouths at a temperature at which they remain free of thermal deformation. Additionally, the wax is useful for adjusting the viscosity of the composition to render the composition smoothly applicable. Examples of useful waxes are microcrystalline wax and paraffin wax, which may be used singly or in admixture. The heat-sealing composition contains preferably 10 to 70% by weight, more preferably 1 5 to 30% by weight, of the wax. When containing less than 10% by weight of the wax, the composition will not be smoothly applicable, while use of more than 70% by weight of the wax leads to reduced adhesion in view of its ratio relative to the ethylene copolymer.The composition may further contain 0 to 40% by weight, preferably 20 to 25% by weight, of rosin and 0 to 30% by weight, preferably 10 to 15% by weight, of styrene when so desired. Rosin is useful for adjusting the viscosity and imparting thermal stability to the composition. Styrene is useful for eliminating stickiness from the composition. Even if these additional components are used in excess of the abovespecified amounts, improved effects are not likely to result. The composition, which is formed into the heat-sealing composition layer by coating as will be described later, is used preferably in an amount of 10 to 40 g/m2.
Examples of preferred heat-sealing compositions are as follows:
Proportions (% by weight)
Example 1 Example ?
Ethylene-vinyl acetate copolymer 40 35
Wax 30 25
Rosin 20 25
Styrene 10 15
Composition Example 1 had a melting point of about 850C, and Composition Example 2 about 900C. For reference, polyethylene has a melting point of 1 200 C.
Another feature of the present invention is that the heat-sealing composition layer is formed under the aluminum foil with a polyolefin layer interposed therebetween. Thus it is not the polyolefin layer but the heat-sealing composition layer that will be adhered to the mouths of bottles by heating.
Whereas difficulties are encountered in forming the heat-sealing composition layer directly on the aluminum foil because the composition is not highly adherent to the aluminum foil, the intervening polyolefin layer which is very adherent to the fi̲l permits the deformation of the heat-sealing composition layer on the aluminum foil. Consequently when the material as adhered to the mouth of a both as a cover is removed therefrom, the aluminum foil, the polyolefin layer and the heat-sealing composition layer are removable as joined together without permitting part of the cover to remain adhered to the mouth. Moreover, the polyolefin layer provided between the aluminum foil and the heat-sealing composition layer eliminates the likelihood that the contents of the bottle will cause corrosion to the aluminum foil.The polyolefin layer further imparts increased mechanical strength to the covering material while serving as a packing because of its cushioning properties, thus enabling the cover to hermetically seat the bottle. Examples of useful polyolefins are polyethylene, polypropylene, ethylene-vinyl acetate copolymer and ionomer, among which polyethylene is economically advantageous to use. It is suitable that the polyolefin layer be 10 to 40 y in thickness.
To enhanced bond strength to the polyolefin layer for adhesion to the aluminum foil, the aluminum foil is formed over the lower layer thereof with an anchor coat 0.1 to 1 y in thickness. The anchor coat can be formed from polyurethane, polyimine or titanium ester.
For the identification of the contents of the bottles for which the covering material is used or for other purposes, a printing may be provided on the upper surface of the aluminum foil by gravure. The printing ink to be used for this purpose is prepared by dissolving vinyl chloride, nitrocellulose, polyamide, epoxy resin or acrylic resin, and organic pigment or dye in a solvent.
The covering material of this invention is usable as covers, lids, or caps for containers other than bottles and can be adhered by heating to bottles and containers which are made of material other than synthetic resin.
With use of the covering material of this invention, the mouths or openings of any containers including bottles can be heat-sealed at a low temperature of 70 to 1 O0C quickly within one second.
Accordingly containers can be sealed at a high speed free of any thermal deformation. The lid or cover is removable from the mouth neatly without leaving any part of the cover.
This invention will be described below with reference to the accompanying drawings, in which:
Fig. lisa perspective view showing a covering material of this invention including a printing layer, an aluminum foil, an anchor coat layer and a polyolefin layer which are partly broken away stepwise;
Fig. 2 is a schematic side elevation showing the step of forming the polyolefin layer on the aluminum foil; and
Fig. 3 is a schematic side elevation showing the step of forming a heat-sealing composition layer on the polyolefin layer.
Fig. 1 shows a covering material 1 of this invention comprising an aluminum foil 3 having a printing surface 2 for identifying the contents of the bottles to be sealed with the material 1, a polyolefin layer 5 formed on the lower surface of the aluminum foil 3 with an anchor coat 4 provided therebetween, and a layer 6 of heat-sealing composition formed on the lower surface of the polyolefin layer 5, the composition being composed of an ethylene copolymer and a wax.
The polyolefin layer 5 is formed on the lower surface of the aluminum foil 3 by the procedure illustrated in Fig. 2. Fig. 2 shows a cooling roll 7 and a rubber roll 8 disposed to the rear of the roll 7 and in intimate contact therewith. An extruder 10 is provided above the rolls 7 and 8 in such a position that the downwardly extending extrusion outlet 9 of the extruder 10 is located above the nip of the rolls and slightly closer to the rubber roll 8. The extrusion outlet 9 is in the form of a slit having a length approximately equal to the width of an aluminum foil 11 and is in parallel to the shaft of the rubber roll 8. The aluminum foil 11 wound up on a reel in the form of a coil has already been printed on one side thereof first and thereafter formed with an anchor coat on the other side thereof by known methods.
The aluminum foil 11 is passed over guide rolls 1 2 and fed over the rubber roll 8 to the nip of the rolls 8 and 7. At this time, the anchor coat on the aluminum foil 11 is positioned face-up. The extruder 10 forces out through the outlet 9 molten polyethylene in the form of a curtain and applies the melt to the anchor coat, thus progressively coating the aluminum foil with the advance of the foil. The resulting coating is cooled and solidified by being brought into contact with the cooling roll 7. The foil coated with the polyethylene layer, i.e. with polyolefin layer, is passed beneath the roll 7 and then over guide rolls 14 and wound up on a reel in the form of a coil as indicated at 1 5.
The heat-sealing composition layer is formed on the lower surface of the polyolefin layer by the procedure shown in Fig. 3. A gravure roll 1 6 provided with a doctor 1 5 is immersed at its lower portion in a heat-sealing composition 1 8 in a molten state. A press roll 1 9 is provided on the gravure roll 1 6. A first cooling roll 20 and a second cooling roll 21 spaced apart from each other by a predetermined distance are arranged to the front of the roll 1 6 thereabove.The aluminum foil 22 already coated with the polyolefin layer and rolled up is paid out from the reel and passed over a guide roll 23 to the nip of the gravure roll 1 6 and the press roll 1 9. At this time, the molten heat-sealing composition on the gravure roll 16 is applied to the polyolefin layer facing down. With the advance of the aluminum foil, the polyolefin layer is progressively coated with the heat-sealing composition. The resulting coating is cooled and solidified by being brought into contact with the cooling rolls 20 and 21. The aluminum foil thus formed with the polyolefin layer and further with a heat-sealing composition layer is led over a guide roll 24 to a reel, which takes up the foil in the form of a coil as indicated at 25.
The covering material of this invention is in the form of a strip as seen in Fig. 1 and is usually wound up as a coil. In an automatic bottling process, the material is paid out from the coil, circular pieces are blanked out from the material, the pieces are then placed over the mouths of bottles filled with contents and thereafter adhered thereto with heating to seal the bottles.
Claims (8)
1. A heat-sealing covering material comprising an aluminum foil, a layer of polyolefin formed on the lower surface of the aluminum foil and a layer of heat-sealing composition formed on the lower surface of the polyolefin layer, the heat-sealing composition consisting essentially of an ethylene copolymer and a wax.
2. A heat-sealing covering material as defined in claim 1 wherein the polyolefin is a compound selected from the group consisting of a polyethylene, polypropylene, ethylene-vinyl acetate copolymer and ionomer.
3. A heat-sealing covering material as defined in claim 1 wherein theethylene copolymer is a compound selected from the group consisting of ethylene-vinyl acetate copolymer, ethylene-vinyl chloride copolymer and ethylene-styrene copolymer.
4. A heat-seaiing covering material as defined in claim 1 wherein the wax is a member selected from a group consisting of microcrystalline wax, paraffin wax, and a mixture thereof.
5. A heat-sealing covering material as defined in claim 1 wherein the heat-sealing composition comprises 10 to 80% by weight of the ethylene copolymer and 10 to 70% by weight of the wax.
6. A heat-sealing covering material as defined in claim 1 wherein the heat-sealing material further contains 0 to 40% by weight of rosin and 0 to 30% by weight of styrene.
7. A heat-sealing covering material as defined in claim 1 wherein the aluminum foil is provided with an anchor coat over the surface thereof facing the polyolefin layer.
8. A heat-sealing covering material substantially as herein described with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8816278 | 1978-07-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2025791A true GB2025791A (en) | 1980-01-30 |
| GB2025791B GB2025791B (en) | 1982-09-02 |
Family
ID=13935222
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7839047A Expired GB2025791B (en) | 1978-07-18 | 1978-10-03 | Heatsealing covering material |
Country Status (7)
| Country | Link |
|---|---|
| AR (1) | AR217322A1 (en) |
| AU (1) | AU512816B2 (en) |
| BR (1) | BR7807446A (en) |
| GB (1) | GB2025791B (en) |
| MX (1) | MX150463A (en) |
| NZ (1) | NZ188513A (en) |
| PH (1) | PH15222A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2551031A1 (en) * | 1983-08-24 | 1985-03-01 | Alsacienne Aluminium | PEEL OPENING CONTAINER AND PROCESS FOR PRODUCING CLOSURE ELEMENTS THEREOF |
| FR2631887A1 (en) * | 1988-05-31 | 1989-12-01 | Daimatsu Kagaku Kogyo Kk | |
| EP1419976A2 (en) * | 2002-11-13 | 2004-05-19 | Hydro Aluminium Deutschland GmbH | Composite material for a cover with coating produced by coextrusion |
-
1978
- 1978-09-27 NZ NZ188513A patent/NZ188513A/en unknown
- 1978-09-28 AR AR273878A patent/AR217322A1/en active
- 1978-10-03 GB GB7839047A patent/GB2025791B/en not_active Expired
- 1978-10-04 MX MX175110A patent/MX150463A/en unknown
- 1978-10-12 AU AU40648/78A patent/AU512816B2/en not_active Expired
- 1978-11-13 BR BR7807446A patent/BR7807446A/en unknown
-
1979
- 1979-01-26 PH PH22130A patent/PH15222A/en unknown
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2551031A1 (en) * | 1983-08-24 | 1985-03-01 | Alsacienne Aluminium | PEEL OPENING CONTAINER AND PROCESS FOR PRODUCING CLOSURE ELEMENTS THEREOF |
| EP0135431A1 (en) * | 1983-08-24 | 1985-03-27 | Societe Alsacienne D'aluminium | Manufacturing process for container lids to be opened by peeling, and lids obtained by the realisation of this method |
| FR2631887A1 (en) * | 1988-05-31 | 1989-12-01 | Daimatsu Kagaku Kogyo Kk | |
| GB2219756A (en) * | 1988-05-31 | 1989-12-20 | Daimatsu Kagaku Kogyo Kk | Adhesive material |
| EP1419976A2 (en) * | 2002-11-13 | 2004-05-19 | Hydro Aluminium Deutschland GmbH | Composite material for a cover with coating produced by coextrusion |
| EP1419976A3 (en) * | 2002-11-13 | 2005-02-02 | Hydro Aluminium Deutschland GmbH | Composite material for a cover with coating produced by coextrusion |
Also Published As
| Publication number | Publication date |
|---|---|
| AU512816B2 (en) | 1980-10-30 |
| NZ188513A (en) | 1980-02-21 |
| MX150463A (en) | 1984-05-11 |
| AU4064878A (en) | 1980-04-17 |
| BR7807446A (en) | 1980-05-13 |
| AR217322A1 (en) | 1980-03-14 |
| PH15222A (en) | 1982-09-27 |
| GB2025791B (en) | 1982-09-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PE20 | Patent expired after termination of 20 years |
Effective date: 19981002 |