WO1990007427A1 - Resealable packaging material - Google Patents
Resealable packaging material Download PDFInfo
- Publication number
- WO1990007427A1 WO1990007427A1 PCT/US1990/000101 US9000101W WO9007427A1 WO 1990007427 A1 WO1990007427 A1 WO 1990007427A1 US 9000101 W US9000101 W US 9000101W WO 9007427 A1 WO9007427 A1 WO 9007427A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- packaging material
- layer
- adhesive
- skin layer
- seal
- Prior art date
Links
- 239000005022 packaging material Substances 0.000 title claims abstract description 38
- 239000000853 adhesive Substances 0.000 claims abstract description 46
- 230000001070 adhesive effect Effects 0.000 claims abstract description 46
- 239000000758 substrate Substances 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 21
- 239000005021 flexible packaging material Substances 0.000 claims abstract description 7
- 239000010410 layer Substances 0.000 claims description 76
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims description 23
- 238000007789 sealing Methods 0.000 claims description 16
- 239000012790 adhesive layer Substances 0.000 claims description 10
- 238000004806 packaging method and process Methods 0.000 claims description 10
- 239000003205 fragrance Substances 0.000 claims description 7
- 229920000642 polymer Polymers 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- 229920000554 ionomer Polymers 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000013618 particulate matter Substances 0.000 claims description 3
- 229920001169 thermoplastic Polymers 0.000 claims description 3
- 229920002725 thermoplastic elastomer Polymers 0.000 claims description 3
- 229920002472 Starch Polymers 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 235000019698 starch Nutrition 0.000 claims description 2
- 239000008107 starch Substances 0.000 claims description 2
- 239000000454 talc Substances 0.000 claims description 2
- 229910052623 talc Inorganic materials 0.000 claims description 2
- 239000004416 thermosoftening plastic Substances 0.000 claims description 2
- 229920006267 polyester film Polymers 0.000 abstract 1
- 230000007246 mechanism Effects 0.000 description 14
- 238000000576 coating method Methods 0.000 description 7
- 229920001577 copolymer Polymers 0.000 description 7
- 229920001971 elastomer Polymers 0.000 description 7
- 239000000806 elastomer Substances 0.000 description 7
- -1 poly(ethylene terephthalate) Polymers 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 5
- 235000013305 food Nutrition 0.000 description 5
- 150000001336 alkenes Chemical class 0.000 description 4
- 235000013339 cereals Nutrition 0.000 description 4
- 235000011888 snacks Nutrition 0.000 description 4
- 229920006270 hydrocarbon resin Polymers 0.000 description 3
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
- 229920002633 Kraton (polymer) Polymers 0.000 description 2
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 2
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 2
- 230000032798 delamination Effects 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000003209 petroleum derivative Substances 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 239000005033 polyvinylidene chloride Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000003855 Adhesive Lamination Methods 0.000 description 1
- UIERETOOQGIECD-UHFFFAOYSA-N Angelic acid Natural products CC=C(C)C(O)=O UIERETOOQGIECD-UHFFFAOYSA-N 0.000 description 1
- 229920002799 BoPET Polymers 0.000 description 1
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 description 1
- 239000013032 Hydrocarbon resin Substances 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 239000005041 Mylar™ Substances 0.000 description 1
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 1
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Natural products C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 1
- 229920003182 Surlyn® Polymers 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 125000002843 carboxylic acid group Chemical group 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000009459 flexible packaging Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000002762 monocarboxylic acid derivatives Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000005026 oriented polypropylene Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 1
- 239000002530 phenolic antioxidant Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000346 polystyrene-polyisoprene block-polystyrene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 235000013606 potato chips Nutrition 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 150000003505 terpenes Chemical class 0.000 description 1
- 235000007586 terpenes Nutrition 0.000 description 1
- UIERETOOQGIECD-ONEGZZNKSA-N tiglic acid Chemical compound C\C=C(/C)C(O)=O UIERETOOQGIECD-ONEGZZNKSA-N 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc 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
- B32B27/00—Layered products comprising a layer of synthetic resin
-
- 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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/06—Interconnection of layers permitting easy separation
-
- 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
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/16—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer formed of particles, e.g. chips, powder or granules
-
- 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
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/02—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising animal or vegetable substances, e.g. cork, bamboo, starch
-
- 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
- B32B2317/00—Animal or vegetable based
- B32B2317/20—Starch
-
- 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
- B32B2439/00—Containers; Receptacles
- B32B2439/70—Food packaging
Definitions
- Flexible packaging materials comprising layers of thermoplastic polymers are used to package a variety of products, particularly food. For example, cereals, potato chips and other snack foods are packaged in such materials.
- the packages are formed in packaging machines in which the material is sealed to itself by heated sealing jaws. However, when a package is opened by pulling apart one of the heat seals, normally at the top of the package, the heat seal is not reasealable without the application of heat as well as pressure.
- This invention provides a flexible packaging material that is resealable by the application of pressure alone at the area of a seal formed by a packaging machine.
- the material of this invention comprises a substrate layer, a layer of tacky adhesive adjacent the substrate layer, and a skin layer covering the layer of tacky adhesive.
- the substrate layer may comprise any material that is conventionally used for flexible packaging applications, such as plastic film, metal foil, paper or a combination thereof.
- Plastic film substrates may be single layer or multilayer and may be oriented or unoriented.
- the film can be polya ide, polyester, or olefin polymer or copolymer.
- Suitable substrates include poly(ethylene terephthalate) film, paper, oriented polypropylene film, and nonwoven materials.
- tacky adhesive refers to an adhesive that, in the practice of this invention, forms a resealable bond by the application of manual pressure alone at room temperature.
- the reseal strength is preferably between about 0.5 and 4 pounds per inch (0.1 and 0.7 kg/cm), more preferably between about one and two pounds per inch (0.18 and 0.36 kg/cm).
- Such adhesives may include cold seals and tacky lacquers. Cold seals are formed from aqueous latex emulsions of an elastomer.
- the tacky adhesive is preferably a pressure sensitive adhesive, which is a blend of an elastomer and a tackifier.
- the pressure sensitive adhesive preferably comprises from about 40 to 80 percent of a thermoplastic elastomer, 20 to 60 percent of a tackifier, and up to about 15 percent of other components, such as a fragrance and conventional additives, such as an antioxidant and an oil.
- the fragrance is not appreciably noticeable until the material is formed into a package and the package is opened because the fragrance is essentially encapsulated in the packaging material.
- the fragrance is liberated, thereby enhancing the appeal of the product in the package. Best results are obtained using an oil-based fragrance that is absorbed by the elastomer component of the adhesive.
- elastomers include styrene copolymers, such as styrene-butadiene copolymers sold under the trademark Stereon by Firestone and styrene-isoprene copolymers sold under the trademark Kraton by Shell Chemical Company.
- styrene copolymers such as styrene-butadiene copolymers sold under the trademark Stereon by Firestone and styrene-isoprene copolymers sold under the trademark Kraton by Shell Chemical Company.
- Other suitable elastomers include polyurethane and ethylene-vinyl acetate copolymers having a vinyl acetate content of about 18 percent or higher.
- the tackifier may be any tackifier conventionally used with, elastomers to form pressure sensitive adhesives.
- Suitable tackifiers include terpene resins, such as resins sold under the trademark Zonatac by Arizona Chemical Company, and petroleum hydrocarbon resins, such as resins sold under the trademark Escorez by Exxon Chemical Company.
- the pressure sensitive adhesive is preferably coextrudable.
- the coextrudability of the pressure sensitive adhesive may be enhanced by utilizing a thermoplastic elastomer having a low melt index and by increasing the proportion of the elastomer in the adhesive.
- the melt index of the adhesive is preferably less than 30, more preferably less than 10, for coextrusion with conventional polyolefin ⁇ .
- the pressure sensitive adhesive, or other tacky adhesive may be applied to the substrate by methods other than extrusion, such as adhesive lamination, rotogravure, flexographic or silk screen printing, Meyer rod, spray coating, charged particle coating, or vacuum deposition.
- the adhesive may be applied as 100 percent solids or by using water or a solvent as a vehicle.
- the adhesive may be coated onto the substrate in register only where it is required.
- the skin layer may be similarly applied in register over the adhesive alone, such as by printing the adhesive layer and the skin layer onto the substrate sequentially using a central impression press.
- the skin layer may be applied to other surface areas as well, including the entire surface of the packaging material.
- the tacky adhesive may also be applied to the substrate by transferring it from a carrying medium.
- This technique is commonly used to transfer a thin layer of metal, such as that formed by vapor deposition, from one substate to another in the manufacture of metallized packaging materials.
- the skin layer may also be transferred with the adhesive by this technique.
- the carrying medium is preferably paper coated with a silicone release agent.
- the paper substrate may be recycled and may be an endless belt in a continuous process. If the paper bearing the adhesive layer is rolled up, it is preferably coated with the release agent on both sides to prevent blocking.
- the thickness of the layer of tacky adhesive is preferably between about 0.1 and 2.0 mil (2.5 and 51 microns), more preferably between about 0.3 and 0.7 mil (7.6 and 18 microns).
- the skin layer performs two critical functions. First, it produces a coefficient of friction on the surface of the packaging material such that the material is machinable in a conventional packaging machine. Second, the skin layer becomes broken so that when the seal is pulled apart, the tacky adhesive is exposed at the surface of the seal. There are two mechanisms by which this occurs. In one mechanism (First Mechanism) , the skin layer is disrupted by the shearing action of the sealing jaws in the packaging machine such that the tacky adhesive becomes present at the interface where the material is sealed to itself. The skin layer is preferably disrupted over most of the area of the seal. By this mechanism, it is possible to produce the initial seal from the tacky adhesive alone, thereby obviating the need to apply heat to the sealing jaws.
- First Mechanism the skin layer is disrupted by the shearing action of the sealing jaws in the packaging machine such that the tacky adhesive becomes present at the interface where the material is sealed to itself.
- the skin layer is preferably disrupted over most of the area of the seal.
- the skin layer is heat sealed to itself, preferably using flat sealing jaws, and remains substantially intact until it ruptures through to the adhesive layer when force is initially applied to pull the heat seal apart.
- the skin layer then delaminates from the substrate layer when additional force is applied until the end of the seal is reached.
- the delamination may occur between the skin layer and the adhesive layer, between the adhesive layer and the substrate layer, or r preferably, in a plane lying in the adhesive layer so the adhesive is present on both surfaces of the seal area after the seal has been pulled apart.
- the latter type of delamination is promoted by heating both sealing jaws when the heat seal is formed.
- the tacky adhesive is preferably an extrudable pressure sensitve adhesive which is coextruded with the skin layer, either with the substrate layer or onto the substrate layer.
- the substrate layer is coextruded with the skin layer and the adhesive layer, either blown film coextrusion or cast film coextrusion may be employed.
- the extrudate may contain multiple layers of the pressure sensitive adhesive.
- the skin layer may be a layer of a thermoplastic film-forming polymer which is conventionally used as a heat seal layer in packaging materials.
- the polymer preferably has a tensile strength such that at the desired thickness of the skin layer the heat seal is easy to open, preferably by a force between about 0.4 and 0.9 kg/cm.
- the polymer also preferably has a low elongation at break, preferably less than 400 percent.
- the polymer is preferably a copolymer of -5- ethylene and an ethylenically unsaturated comonomer selected from the group consisting of carboxylic acids and esters, salts and anhydrides thereof.
- Such comonomers include acrylic acid, methacrylic acid, methyl acrylate, ethyl acrylate, methyl methacrylate, vinyl acetate, and maleic anhydride.
- Such copolymers are well known commercially available polymers commonly used to form heat seal layers in flexible packaging materials.
- Other polymers, such as polyolefins, may be blended with the copolymer in a minor amount.
- the copolymer is preferably an ionomer.
- the term ionomer refers to a film-forming copolymer of an olefin and an ethylenically unsaturated monocarboxylic acid wherein at least 10% of the carboxylic acid groups are neutralized by a metal ion, preferably zinc.
- the olefin is preferably ethylene.
- the carboxylic acid is preferably acrylic acid, methacrylic acid, or methylmethacrylic acid.
- the proportion of olefin units in the ionomer is at least 50, preferably at least 80, mole percent. Suitable ionomers are described in U.S. Patent No. 3,355,319 and are available commercially under the trademark Surlyn.
- the skin layer is preferably relatively thin, preferably thinner than the heat seal layer of conventional packaging materials so the laye -fractures when the sealing jaws are applied or when the seal is pulled apart.
- the thickness of the skin layer is preferably between about 0.05 and 0.5 mil (1.3 and 13 microns), more preferably between about 0.075 and 0.2 mil (1.9 and 5 microns).
- the skin layer may be any substance that produces the desired coefficient of friction and that is sufficiently disrupted by the sealing jaws that the adhesive becomes present at the seal interface.
- the substance may even be finely divided solid particulate matter (dust), such as talc or starch particles.
- the particles may be applied to the adhesive layer in accordance with conventional methods, such as by using Oxydry (trademark) apparatus.
- the skin layer and the layer of pressure sensitive adhesive may be coextruded together generally in accordance with conventional coextrusion coating methods to form the packaging material of the invention.
- the components of the pressure sensitive adhesive are preferably maintained under an inert atmosphere, such as nitrogen, to minimize oxidation at the extrusion temperature, which produces degradation and odor.
- the packaging material may be sealed in accordance with methods typically used for sealing flexible packaging materials in packaging machines.
- the packaging material is preferably sealed by means of sealing jaws that impart shear to the skin layer, such as described in U.S. Patent 4,582,555.
- the shear promotes fracture of the skin layer and exposure of the tacky adhesive when the seal is opened.
- the temperature of the sealing jaws is preferably less than the melting point of the skin layer. In some embodiments, the jaws may be at ambient temperature so the material may effectively be "cold sealed” rather than heat sealed.
- the skin layer is heat sealed to itself at a conventional temperature of about 230°F (110°C).
- the seal has a bond strength that is sufficient to ensure the package does not open during normal handling.
- This bond strength is preferably at least about two pounds per inch (0.4 kg/cm).
- the seal is also preferably easy to open by being pulled apart manually, so the bond strength is preferably less than about five pounds per inch (0.9 kg/cm) .
- the material of this invention may be used in conventional packaging machines, such as form, fill and seal machines, in the same manner as conventional flexible packaging materials.
- a material having a tacky adhesive on its surface could not be used in such machines, of course, because of the high coefficient of friction of the adhesive.
- the ability of a packaging material to be used in packaging machines is referred to in the art as machinability.
- the material of this invention has good machinability.
- each surface of the material has a coefficient of friction against stainless steel which is within the preferred range for machinability, which is from about 0.1 to 0.5.
- a laminate was formed by coextruding a skin layer and a pressure sensitive adhesive onto a substrate.
- the substrate was a poly(ethylene terephthalate) film having a thickness of 12.2 microns (Dupont Mylar).
- the skin layer which was extruded at 218°C, consisted of polystyrene (Dow Styron 625).
- the pressure sensitive adhesive which was extruded at about 163°C, consisted of 68 percent styrene-isoprene-styrene block copolymer (Shell Kraton D-1107), 30 percent aliphatic petroleum hydrocarbon resin (Exxon Escorez 1310), and 2 percent phenolic antioxidant (Ciba-Geigy Irganox 1010).
- the hydrocarbon resin was injected into the barrel of the extruder.
- the thickness of the polystyrene layer was about 0.1 mil (2.5 microns) and the thickness of the layer of pressure sensitive adhesive was about 0.5 mil (12.7 microns).
- the laminate was heat sealed to itself using the heat seal jaws described in U.S.
- Patent 4,582,555 by applying a pressure of 80 psi (5.6 kg/cm) for two seconds at a temperature of 110°F. A force of 3.3 pounds per inch width (0.59 kg/cm) was required to open the heat seal. The opened heat seal was then resealed, opened and resealed again twenty times by applying a pressure of 14 psi (0.99 kg/sq.cm) at room temperature for less than 0.1 second. The average reseal strength was 1.03 pounds per inch width (184 grams/cm).
- a laminate was formed by applying a coating of molten pressure sensitive adhesive onto a substrate, cooling the adhesive, and then applying a coating of polyvinylidene chloride (PVDC) emulsion on top of the adhesive.
- PVDC polyvinylidene chloride
- the coatings were applied using a Meyer rod.
- the substrate was poly(ethylene terephthalate) film having a thickness of one mil (25 microns).
- the pressure sensitive adhesive was heated to about 150°C and applied at a coating weight of about 14 pounds per ream (23 grams per square meter).
- the pressure sensitive adhesive which is commercially available from Findley Adhesives, has a viscosity at 150°C of about 42,000 centipoise.
- the PVDC was applied at a coating weight of about 4 pounds per ream (7 grams per square meter) and dried at about 93°C.
- the laminate was then sealed to itself using sealing jaws that impart high shear.
- the jaws were heated to 71°C and applied at a pressure of 80 psi (5.6 kg/sq.cm).
- a force of 3.2 pounds per inch (0.57 kg/cm) was required to open the seal.
- the opened seal was then resealed, opened and resealed 20 times by applying a pressure of 14 psi (0.99 kg/sq.cm) at room temperature for less than one second .
- the average reseal strength was 0.53 pounds per inch (95 grams per cm).
- the Example illustrates the preparation of packaging material of this invention employing the First Mechanism.
- the material may be used to package cereals and snack foods in packages that may be easily resealed after each intermittent use.
- Example 3 A laminate was formed by coextruding a skin layer and a layer of pressure sensitive adhesive onto a film of high density polyethylene having a thickness of two mils (51 microns).
- the skin layer which was extruded at 230°C, consisted of an ionomer available commercially from Dupont.
- the pressure sensitive adhesive which was extruded at 196°C, is available commercially from Findley Adhesives.
- the adhesive has a viscosity of over one million centipoises at 177°C.
- the basis weight of the adhesive was 5 pounds per ream (8 grams per square meter).
- the basis weight of the skin layer was 4 pounds per ream (7 grams per square meter).
- the laminate was then heat sealed to itself using flat sealing jaws applied at a pressure of 40 psi (2.8 kg/cm) for one second, with one jaw being at room temperature and the other jaw at 116°C.
- a force of 2.4 pounds per inch (0.43 kg/cm) was required to open the heat seal.
- the opened heat seal was then resealed, opened and resealed again 20 times by applying a pressure of 14 psi (0.99 kg/sq.cm) at room temperature for less than one second.
- the average reseal strength was 1.03 pounds per inch (184 grams per cm).
- This Example illustrates the preparation of packaging material of this invention employing the Second Mechanism.
- the material may be used to package cereals and snack foods in packages that may be easily resealed after each intermittent use.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Laminated Bodies (AREA)
- Wrappers (AREA)
- Packages (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Sealing Material Composition (AREA)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR909006997A BR9006997A (pt) | 1989-01-09 | 1990-01-05 | Material flexivel de empacotamento e processo para sua formacao |
CA002045136A CA2045136C (en) | 1989-01-09 | 1990-01-05 | Resealable packaging material |
KR1019900701992A KR910700144A (ko) | 1989-01-09 | 1990-01-05 | 재밀봉 가능한 포장재 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US29507789A | 1989-01-09 | 1989-01-09 | |
US295,077 | 1989-01-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1990007427A1 true WO1990007427A1 (en) | 1990-07-12 |
Family
ID=23136111
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1990/000101 WO1990007427A1 (en) | 1989-01-09 | 1990-01-05 | Resealable packaging material |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0453509A4 (ko) |
JP (1) | JP2938186B2 (ko) |
KR (1) | KR910700144A (ko) |
AU (1) | AU630838B2 (ko) |
BR (1) | BR9006997A (ko) |
CA (1) | CA2045136C (ko) |
WO (1) | WO1990007427A1 (ko) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0516276A3 (en) * | 1991-05-28 | 1993-02-03 | James River Ii, Inc. | Resealable packaging material |
WO1994012072A3 (en) * | 1992-11-24 | 1994-08-04 | Beautiful Bouquet Co Ltd | Volatile liquid samplers and process for their manufacture |
EP1053952A1 (fr) | 1999-05-21 | 2000-11-22 | Soplaril SA | Emballage refermable dont le contenant comprend une couche soudante dechirable, son procédé de fabrication |
EP1053865A1 (fr) * | 1999-05-21 | 2000-11-22 | Soplaril S.A: | Structure multicouche susceptible d'etre obtenue par refermeture de la bulle de coextrusion |
US9212291B2 (en) | 2008-03-31 | 2015-12-15 | Basf Se | Use of meltable acrylate polymers for producing contact adhesive layers |
EP1775122B2 (en) † | 2005-10-11 | 2021-10-06 | Curwood, Inc. | Easy-open reclosable films having an interior frangible interface and articles made therefrom |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5249026B2 (ja) | 2006-06-27 | 2013-07-31 | 出光ユニテック株式会社 | 積層テープ、包装体および積層テープの製造方法 |
FR2931384B1 (fr) * | 2008-05-22 | 2010-05-28 | Bostik Sa | Films multicouche pour emballage flexible |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4615926A (en) * | 1984-07-20 | 1986-10-07 | American Can Company | Film and package having strong seals and a modified ply-separation opening |
US4673601A (en) * | 1984-05-07 | 1987-06-16 | Nyffeler, Corti Ag | Cold- or heat-sealable composite film for reclosable packages |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3454210A (en) | 1968-05-23 | 1969-07-08 | Standard Packaging Corp | Easy opening and reclosable package,film therefor and process |
USRE27361E (en) * | 1970-03-06 | 1972-05-09 | Reclosable package |
-
1990
- 1990-01-05 BR BR909006997A patent/BR9006997A/pt not_active Application Discontinuation
- 1990-01-05 AU AU50413/90A patent/AU630838B2/en not_active Expired
- 1990-01-05 KR KR1019900701992A patent/KR910700144A/ko not_active Withdrawn
- 1990-01-05 CA CA002045136A patent/CA2045136C/en not_active Expired - Lifetime
- 1990-01-05 EP EP19900902864 patent/EP0453509A4/en not_active Withdrawn
- 1990-01-05 WO PCT/US1990/000101 patent/WO1990007427A1/en not_active Application Discontinuation
- 1990-01-05 JP JP2503071A patent/JP2938186B2/ja not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4673601A (en) * | 1984-05-07 | 1987-06-16 | Nyffeler, Corti Ag | Cold- or heat-sealable composite film for reclosable packages |
US4615926A (en) * | 1984-07-20 | 1986-10-07 | American Can Company | Film and package having strong seals and a modified ply-separation opening |
Non-Patent Citations (1)
Title |
---|
See also references of EP0453509A4 * |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0516276A3 (en) * | 1991-05-28 | 1993-02-03 | James River Ii, Inc. | Resealable packaging material |
WO1994012072A3 (en) * | 1992-11-24 | 1994-08-04 | Beautiful Bouquet Co Ltd | Volatile liquid samplers and process for their manufacture |
GB2276820A (en) * | 1992-11-24 | 1994-10-12 | Beautiful Bouquet Co Ltd | Volatile liquid samplers and process for their manufacture |
GB2276820B (en) * | 1992-11-24 | 1995-03-22 | Beautiful Bouquet Co Ltd | Volatile liquid samplers and process for their manufacture |
EP1053952A1 (fr) | 1999-05-21 | 2000-11-22 | Soplaril SA | Emballage refermable dont le contenant comprend une couche soudante dechirable, son procédé de fabrication |
EP1053865A1 (fr) * | 1999-05-21 | 2000-11-22 | Soplaril S.A: | Structure multicouche susceptible d'etre obtenue par refermeture de la bulle de coextrusion |
FR2793724A1 (fr) * | 1999-05-21 | 2000-11-24 | Soplaril Sa | Structure multicouche susceptible d'etre obtenue par refermeture de la bulle de coextrusion |
AU752289B2 (en) * | 1999-05-21 | 2002-09-12 | Soplaril S.A. | A multilayer structure able to be obtained by collapsing a co-extrusion bubble |
US6511723B1 (en) | 1999-05-21 | 2003-01-28 | Soplaril, S.A. | Multilayer structure able to be obtained by collapsing a co-extrusion bubble |
US6777050B1 (en) | 1999-05-21 | 2004-08-17 | Soplaril, S.A. | Resealable packaging the container of which includes a tearable welding layer, and its manufacture |
EP1775122B2 (en) † | 2005-10-11 | 2021-10-06 | Curwood, Inc. | Easy-open reclosable films having an interior frangible interface and articles made therefrom |
US9212291B2 (en) | 2008-03-31 | 2015-12-15 | Basf Se | Use of meltable acrylate polymers for producing contact adhesive layers |
Also Published As
Publication number | Publication date |
---|---|
AU630838B2 (en) | 1992-11-05 |
EP0453509A1 (en) | 1991-10-30 |
EP0453509A4 (en) | 1992-03-18 |
CA2045136A1 (en) | 1990-07-10 |
CA2045136C (en) | 2002-03-19 |
AU5041390A (en) | 1990-08-01 |
JP2938186B2 (ja) | 1999-08-23 |
KR910700144A (ko) | 1991-03-14 |
BR9006997A (pt) | 1991-10-22 |
JPH04502588A (ja) | 1992-05-14 |
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