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Aluminum foil cover film heat-sealed with amorphous polyethylene terephthalate (APET)

An aluminum foil cover and aluminum foil technology, which is applied in flexible covering, coating, packaging and other directions, can solve the problems of peculiar smell, poor heat sealing and poor heat resistance of EVA in the cover film, and achieve low odor sealing and good sealing performance. Effect

Active Publication Date: 2020-09-01
惠州宝柏包装有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) During the synthesis process of EVA resin, there may be residual monomers, resulting in poor heat resistance of EVA, resulting in an odor of the cover film; (2) The multi-layer co-extrusion film or coating layer is relatively thick, and the thickness is usually > 20μm, which is not conducive to the recycling of packaging waste; (3) Due to the material difference between EVA and APET, the way of uncovering EVA and APET after sealing is interface peeling, and heat sealing will occur in the packaging where there may be water or oil bad situation

Method used

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  • Aluminum foil cover film heat-sealed with amorphous polyethylene terephthalate (APET)
  • Aluminum foil cover film heat-sealed with amorphous polyethylene terephthalate (APET)
  • Aluminum foil cover film heat-sealed with amorphous polyethylene terephthalate (APET)

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Experimental program
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Effect test

Embodiment 1

[0024] An aluminum foil cover film heat-sealed with APET, comprising aluminum foil and a heat-sealing coating coated on the aluminum foil. Wherein, the heat-sealing coating is obtained by drying the heat-sealing adhesive coating after coating. The heat-sealing adhesive coating consists of the following components in parts by weight:

[0025] Propionate resin 20 parts

[0026] Copolyester A 60 parts

[0027] Copolyester B 20 parts

[0028] Opening agent polyethylene wax powder 2 parts

[0029] Silicone slip agent 0.5 parts

[0030] 250 parts of ethyl acetate

[0031] 50 parts of butyl acetate.

[0032] The glass transition temperature of above-mentioned propionate resin is 47 ℃, and number average molecular weight is 20000, and acid value<1; The glass transition temperature of copolyester A is-38 ℃, and number average molecular weight is 36000, and acid value is 4; The glass transition temperature of polyester B is 42° C., the number average molecular weight is 12,000, a...

Embodiment 2

[0041] An aluminum foil cover film heat-sealed with APET, comprising aluminum foil and a heat-sealing coating coated on the aluminum foil. Wherein, the heat-sealing coating is obtained by drying the heat-sealing adhesive coating after coating. The heat-sealing adhesive coating consists of the following components in parts by weight:

[0042] 10 parts polyvinyl chloride-propionate copolymer

[0043] Acrylic 30 parts

[0044] Copolyester 60 parts

[0045] Opening agent polyethylene wax powder 1 part

[0046] 300 parts of ethyl acetate

[0047] 100 parts of butyl acetate.

[0048] The above-mentioned polyvinyl chloride-propionate copolymer has a glass transition temperature of 47°C and a number average molecular weight of 12,000; the glass transition temperature of acrylate is 46°C, with a number average molecular weight of 15,000 and an acid value of 2; The glass transition temperature is 7°C, the number average molecular weight is 23,000, the acid value is <2, and the hyd...

Embodiment 3

[0054] An aluminum foil cover film heat-sealed with APET, comprising aluminum foil and a heat-sealing coating coated on the aluminum foil. Wherein, the heat-sealing coating is obtained by drying the heat-sealing adhesive coating after coating. The heat-sealing adhesive coating consists of the following components in parts by weight:

[0055] 10 parts polyvinyl chloride-propionate copolymer

[0056] Acrylic 40 parts

[0057] Copolyester 50 parts

[0058] Opening agent polyethylene wax powder 1 part

[0059] 425 parts of ethyl acetate

[0060] 100 parts of butyl acetate.

[0061]The above-mentioned polyvinyl chloride-propionate copolymer has a glass transition temperature of 47°C and a number average molecular weight of 12,000; the glass transition temperature of acrylate is 46°C, with a number average molecular weight of 15,000 and an acid value of 2; The glass transition temperature is 7°C, the number average molecular weight is 23,000, the acid value is <2, and the hydr...

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Abstract

The invention discloses an aluminum foil cover film heat-sealed with amorphous polyethylene terephthalate (APET). The aluminum foil cover film comprises aluminum foil and a heat-sealing coating whichis applied to the aluminum foil. The heat-sealing coating is obtained by applying and drying heat-sealing glue paint. The heat-sealing glue paint is composed of the following components including, byweight, 80-400 parts of resin, 0-10 parts of an additive and 200-600 parts of a solvent. The heat-sealing coating is 0.5-20 [mu]m in thickness. According to the aluminum foil cover film heat-sealed with the amorphous polyethylene terephthalate (APET), a solution coated processing mode is adopted, the heat-sealing glue paint is applied to the aluminum foil, and the advantages of high resistance, low smell and reliable sealing are achieved.

Description

technical field [0001] The invention relates to the technical field of packaging material packaging, in particular to an aluminum foil cover film heat-sealed with APET. Background technique [0002] At present, the packaging products of "blister tray + easy-to-open lid film" have been widely used in the packaging process of cooked food, dried fruit and fresh fruits and vegetables. Because amorphous polyethylene terephthalate (APET) has the characteristics of low price, high transparency, environmental protection, easy processing and excellent physical and mechanical properties, APET is often used as the packaging of "blister tray + easy-to-open lid film" Trays in the product. [0003] The easy-to-peel lid film heat-sealed with APET is mainly made of ethylene-vinyl acetate copolymer (EVA), and the easy-to-peel lid film is prepared by the following two methods: (1) multi-layer co-extruded blown film, the belt The multi-layer co-extruded film with EVA is bonded to other films...

Claims

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Application Information

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IPC IPC(8): B65D65/42C09D167/00C09D133/04C09D127/06C09D161/28C09D7/65
CPCB65D65/42C09D167/00C09D7/65C08L2205/025C08L2205/035C08L67/00C08L33/04C08L23/06C08L27/06C08L61/28
Inventor 冯润财张羽高虎
Owner 惠州宝柏包装有限公司