阅读说明：本技术 一种与apet热封的铝箔盖膜 (Aluminum foil cover film thermally sealed with APET ) 是由 冯润财 张羽 高虎 于 2020-05-15 设计创作，主要内容包括：本发明公开了一种与APET热封的铝箔盖膜,包括铝箔和涂布于所述铝箔上的热封涂层,所述热封涂层为热封胶涂料涂布后干燥所得；所述热封胶涂料,按重量份数,由以下组分组成：树脂80-400份,添加剂0-10份,溶剂200-600份；所述热封涂层的厚度为0.5-20μm。本发明提供的这种与APET热封的铝箔盖膜,采用溶液涂布的加工方式,将热封胶涂料涂覆于铝箔上,具有高阻隔、低气味和封口可靠的优点。(The invention discloses an aluminum foil cover film thermally sealed with APET, which comprises an aluminum foil and a heat-seal coating coated on the aluminum foil, wherein the heat-seal coating is obtained by drying a heat-seal adhesive coating after coating; the heat-seal adhesive coating comprises the following components in parts by weight: 80-400 parts of resin, 0-10 parts of additive and 600 parts of solvent; the thickness of the heat-seal coating is 0.5-20 μm. The aluminum foil cover film thermally sealed with APET provided by the invention adopts a solution coating processing mode to coat the heat-seal adhesive coating on the aluminum foil, and has the advantages of high barrier property, low odor and reliable sealing.)

1. The aluminum foil cover film thermally sealed with the APET is characterized by comprising an aluminum foil and a heat-seal coating coated on the aluminum foil, wherein the heat-seal coating is obtained by drying a heat-seal adhesive coating after coating;

the heat-seal adhesive coating comprises the following components in parts by weight: 80-400 parts of resin, 0-10 parts of additive and 600 parts of solvent;

the thickness of the heat-seal coating is 0.5-20 μm.

2. The aluminum foil cover film as claimed in claim 1, wherein the resin includes at least one of acrylic resin, acrylate resin, methacrylic resin, methacrylate resin, polyester, copolyester resin, polyvinyl acetate and its copolymer, polyethylene and its copolymer, polyvinyl chloride and its copolymer, polypropylene and its copolymer, chlorinated polypropylene and its copolymer, polystyrene and its copolymer, polyacrylonitrile and its copolymer, polyurethane and its copolymer, polyamide and its copolymer, polyether and its copolymer, amino resin and its copolymer, melamine-formaldehyde resin and its copolymer, polyethyleneimine and its copolymer, silicone resin, modified cellulose, polyvinylidene chloride and its copolymer, and polyvinylidene fluoride and its copolymer.

3. The aluminum foil cover film as claimed in claim 1, wherein the solvent includes at least one of ethyl acetate, butyl acetate, ethanol, propanol, isopropanol, butanol, acetone, butanone, cyclohexanone, n-hexane, isooctane, benzene, toluene, xylene, trimethylbenzene, ethylene glycol dimethyl ether, dioxane and petroleum ether.

4. The aluminum foil lidding film of claim 1 wherein the additives include an opener agent and a slip agent.

5. The aluminum foil cover film as claimed in claim 4, wherein the opening agent comprises at least one of fine silica powder, fine calcium carbonate powder, titanium dioxide powder, talc powder, fine diatomaceous earth powder, polyethylene wax powder and polyamide wax powder, and the solid content of the opening agent in the coating is 0-8%.

6. The aluminum foil cover film as claimed in claim 4, wherein the slip agent is at least one of silicone slip agents, erucamide slip agents and oleamide slip agents, and the solid content of the slip agent in the coating layer is 0-2%.

7. The aluminum foil lidding film of claim 1 wherein the heat seal coating has a coating thickness in the aluminum foil of 2-15 μm.

8. The aluminum foil lidding film of claim 1 wherein the heat seal strength of the aluminum foil lidding film to APET is 2-25N/15 mm.

9. The aluminum foil lidding film of claim 1 wherein the aluminum foil lidding film has a seal-opening temperature with APET of 80-150 ℃.

Technical Field

The invention relates to the technical field of packaging materials, in particular to an aluminum foil cover film thermally sealed with APET.

Background

At present, the packaging product of the blister tray and the easy-to-open cover film is widely applied to the packaging procedures of cooked food, dry fruits, fresh fruits and vegetables and other products. Because amorphous polyethylene terephthalate (APET) has the characteristics of low cost, high transparency, environmental protection, easy processing and excellent physical and mechanical properties, APET is often used as a tray in a "blister tray + easy-to-tear cover film" packaged product.

The easy-to-uncover cover film thermally sealed with APET is mainly made of ethylene-vinyl acetate copolymer (EVA) and is prepared by the following two methods: (1) the multilayer coextrusion blown film is formed by laminating the multilayer coextrusion film with EVA with other films, and the lamination can adopt processing modes such as dry lamination, solvent-free and the like; (2) and coating an EVA layer on the surface of other films.

However, the easy-release films prepared by the above two methods generally have the following problems:

(1) because residual monomers may exist in the synthesis process of the EVA resin, the EVA has poor heat resistance and causes the cover film to have peculiar smell; (2) the multilayer co-extruded film or the spraying layer is thicker, the thickness is usually more than 20 mu m, and the recycling of the discarded package is not facilitated; (3) due to the difference of the materials of the EVA and the APET, the tearing-off mode after the EVA and the APET are sealed is interface peeling, and the situation of poor heat sealing can occur in the packaging occasions with water or oil.

Disclosure of Invention

The invention provides an aluminum foil cover film thermally sealed with APET, which adopts a solution coating processing mode to coat a heat seal adhesive coating on an aluminum foil, and has the advantages of high barrier, low odor and reliable sealing.

In order to achieve the purpose, the invention provides the following technical scheme:

an aluminum foil cover film thermally sealed with APET comprises an aluminum foil and a heat-seal coating coated on the aluminum foil, wherein the heat-seal coating is obtained by drying after a heat-seal adhesive coating is coated; the heat-seal adhesive coating comprises the following components in parts by weight: 80-400 parts of resin, 0-10 parts of additive and 600 parts of solvent; the thickness of the heat-seal coating is 0.5-20 μm.

When the heat-seal adhesive coating is coated on the aluminum foil, the heat-seal adhesive coating can be prepared by adopting a processing mode of coating solution or dispersion liquid, and the coating process can be finished by adopting a one-time coating mode or a multi-layer coating mode.

As a further description of the technical solution of the present invention, the resin includes at least one of acrylic resin, acrylic ester resin, methacrylic acid resin, methacrylic ester resin, polyester, copolyester resin, polyvinyl acetate and a copolymer thereof, polyethylene and a copolymer thereof, polyvinyl chloride and a copolymer thereof, polypropylene and a copolymer thereof, chlorinated polypropylene and a copolymer thereof, polystyrene and a copolymer thereof, polyacrylonitrile and a copolymer thereof, polyurethane and a copolymer thereof, polyamide and a copolymer thereof, polyether and a copolymer thereof, amino resin and a copolymer thereof, melamine-formaldehyde resin and a copolymer thereof, polyethyleneimine and a copolymer thereof, silicone resin, modified cellulose, polyvinylidene chloride and a copolymer thereof, and polyvinylidene fluoride and a copolymer thereof.

The content of the resin in the coating is 7.5-45%, preferably 10-35%.

As a further description of the technical solution of the present invention, the solvent includes at least one of ethyl acetate, butyl acetate, ethanol, propanol, isopropanol, butanol, acetone, butanone, cyclohexanone, n-hexane, isooctane, benzene, toluene, xylene, trimethylbenzene, ethylene glycol dimethyl ether, dioxane, and petroleum ether.

As a further description of the technical solution of the present invention, the additives include an opening agent and a slipping agent.

As further description of the technical scheme of the invention, the opening agent comprises at least one of silica micro powder, calcium carbonate micro powder, titanium dioxide, talcum powder, diatomite micro powder, polyethylene wax powder and polyamide wax powder, and the solid content of the opening agent in the coating is 0-8%.

As further description of the technical scheme of the invention, the slipping agent is at least one of silicone slipping agent, erucic acid amide slipping agent and oleic acid amide slipping agent, and the solid content of the slipping agent in the coating is 0-2%.

As a further description of the solution according to the invention, the coating thickness of the heat-seal coating in the aluminium foil is 2-15 μm.

As further description of the technical scheme of the invention, the heat seal strength of the aluminum foil cover film and the APET is 2-25N/15 mm; of course, the heat seal strength of the aluminum foil cover film and the APET can also be adjusted as required.

As further description of the technical scheme of the invention, the sealing temperature of the aluminum foil cover film and the APET is 80-150 ℃.

Further, the sealing temperature of the aluminum foil cover film and the APET is preferably 90-130 ℃.

The invention has the beneficial effects that: the APET heat-sealed aluminum foil cover film provided by the invention adopts a solution coating processing mode to coat the heat-sealing adhesive coating on the aluminum foil, and has the advantages of high barrier property, low odor and reliable sealing.

The combination of the preferred resin, solvent and additive can ensure that the sealing performance is good and the cover film is not loosened when the aluminum foil cover film is thermally sealed to the aluminum foil.

Detailed Description

The technical solution of the invention is further described below with reference to specific examples.