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Paper-plastic composite film and production process thereof

A technology of paper-plastic composite and production process, which is applied in the direction of special paper, synthetic resin layered products, paper/cardboard layered products, etc. It can solve the problem that the shelf life and pressure resistance of packaging composite films cannot meet the requirements and affect the contents. Hygiene and safety, low composite film fastness and other issues, to achieve excellent strength and stiffness, low price, and good appearance.

Active Publication Date: 2010-10-27
浙江粤海包装新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Purely using dry lamination, although the lamination strength is high, there are solvent residues between layers, and as the number of layers of the composite film increases, the solvent residues superimpose, affecting the sanitation and safety of the contents; purely using extrusion lamination, although there is no solvent residual, but the composite fastness of the composite film is low, and the shelf life and pressure resistance of the packaging composite film cannot meet the requirements

Method used

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  • Paper-plastic composite film and production process thereof
  • Paper-plastic composite film and production process thereof
  • Paper-plastic composite film and production process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Extrusion compounding: kraft paper 1 and vacuum aluminized polyethylene terephthalate film 3 are synchronously entered into the T-shaped extrusion casting die, and at the same time, the polyethylene resin is directly melted and extruded from the T-shaped casting die. The resin adhesive layer 2 is formed between the kraft paper 1 and the aluminum-coated surface 31 of the vacuum aluminum-coated polyethylene terephthalate film 3, pressed by a hot pressing roll and cooled by a cooling roll, and wound to form a three-layer composite membrane;

[0023] Dry compounding: the polyethylene terephthalate surface 32 of the three-layer composite film is coated with a polyester polyurethane adhesive, and the solvent is dried in an oven to form an adhesive layer 4 and then bonded with polyethylene The film is laminated by a hot composite pressure roller and cooled by a cooling roller to form a heat-sealing layer 5, and finally wound to form a four-layer composite film;

[0024] The a...

Embodiment 2

[0028] Extrusion compounding: kraft paper 1 and vacuum aluminized polyethylene terephthalate film 3 are synchronously entered into the T-shaped extrusion casting die, and at the same time, the polypropylene resin is directly melted and extruded from the T-shaped casting die. The resin adhesive layer 2 is formed between the kraft paper 1 and the aluminum-coated surface 31 of the vacuum aluminum-coated polyethylene terephthalate film 3, pressed by a hot pressing roll and cooled by a cooling roll, and wound to form a three-layer composite membrane;

[0029] Dry compounding: the polyethylene terephthalate surface 32 of the three-layer composite film is coated with a polyester polyurethane adhesive, and the solvent is dried in an oven to form an adhesive layer 4 and then combined with polypropylene Laminated by hot composite pressing rollers and cooled by cooling rollers to form a heat-seal layer 5, and finally wound to form a four-layer composite film;

[0030] The above-mentione...

Embodiment 3

[0034] Extrusion compounding: Put kraft paper 1 and vacuum aluminized polyethylene terephthalate film 3 into the T-shaped extrusion casting die simultaneously, and melt and extrude ethylene-vinyl acetate copolymer directly from the T-shaped casting die The material is cast between the kraft paper 1 and the aluminum-coated surface 31 of the vacuum aluminized polyethylene terephthalate film 3 to form a resin bonding layer 2, which is pressed by a hot pressing roll and cooled by a cooling roll, and then rolled to form Three-layer composite film;

[0035] Dry compounding: the polyethylene terephthalate surface 32 of the three-layer composite film is coated with a polyester polyurethane adhesive, and the solvent is dried in an oven to form an adhesive layer 4 and then bonded with polyethylene The film is laminated by a hot composite pressure roller and cooled by a cooling roller to form a heat-seal layer 5, and finally wound to form a four-layer composite film;

[0036] The above-...

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Abstract

The invention discloses a paper-plastic composite film, which consists of kraft paper, a resin bonding layer, a vacuum aluminizing polyethylene glycol terephthalate film, an adhesive layer and a heat sealing layer which are connected in sequence from the top to the bottom. The invention also provides a production process of the paper-plastic composite film, which comprises the following steps of: 1) compounding films by extruding; 2) compounding films in a dry method; and 3) curing and slitting the composite film in a curing chamber. The production process of the paper-plastic composite film combines extrusion compounding with dry compounding, wherein the kraft paper and an aluminum coated layer of VMPET are subjected extrusion compounding to avoid the phenomenon of the transfer of the aluminum coated layer occurring in the conventional dry compounding and ensure the separating performance of the paper-plastic composite film; and higher compounding strength is provided by the dry compounding, so that the paper-plastic composite film has short production period, high compounding firmness and low solvent residue.

Description

technical field [0001] The invention relates to a paper-plastic composite film and a production process thereof. Background technique [0002] At present, most food packaging is mainly made of plastic film packaging with good plasticity, but the texture of plastic film is relatively soft, which cannot protect some brittle foods that are afraid of pressure, and has poor stiffness; It is mainly made by coating paper with resin or pressing and bonding paper and plastic film through molten resin. The composite film prepared has low composite fastness and poor barrier performance. It has high requirements for some fragrance retention. The packaging of foods with a long shelf life, such as melon seeds, tea, milk, etc., cannot meet the requirements. [0003] The traditional production process of flexible packaging composite film is purely one of dry lamination or extrusion lamination. For example, Chinese invention patent 93111229.X disclosed a manufacturing method of a paper-pla...

Claims

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Application Information

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IPC IPC(8): D21H27/30B32B27/04B32B27/36B32B29/00
Inventor 马训明章永明
Owner 浙江粤海包装新材料有限公司
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