CN218989141U

CN218989141U - Multilayer plastic envelope membrane

Info

Publication number: CN218989141U
Application number: CN202122335927.9U
Authority: CN
Inventors: 卞姣; 王军林
Original assignee: YIXING WANGZHE LAMINATING FILM CO Ltd
Current assignee: YIXING WANGZHE LAMINATING FILM CO Ltd
Priority date: 2021-09-26
Filing date: 2021-09-26
Publication date: 2023-05-09
Anticipated expiration: 2031-09-26

Abstract

The utility model discloses a multilayer plastic packaging film which sequentially comprises a hot melt adhesive layer, a surface treatment layer and a substrate layer from top to bottom, wherein the hot melt adhesive layer is of a three-layer structure and sequentially comprises an EVA layer, a POE layer and an EVA layer. According to the utility model, the POE structure is introduced into the hot melt adhesive layer, so that the production cost can be saved; after POE is introduced, the hot melt adhesive layer is changed from a single layer to three layers, and during production, the hot melt adhesive layers with various thicknesses can be coated on the surface of the base material through three-layer coextrusion, and particularly, the efficiency is higher and the advantage is more obvious under the condition of thicker coating thickness.

Description

Multilayer plastic envelope membrane

Technical Field

The utility model relates to the technical field of composite films, in particular to a multilayer plastic packaging film.

Background

The plastic packaging film is used as a most common composite film in our daily life, is prepared by coating a layer of hot melt adhesive on a transparent substrate, is a colorless transparent and glossy film, and has good mechanical property, optical property, electrical property, thermal property, chemical resistance and the like. The plastic packaging film is widely used for protecting various paper certificates such as identity cards, pictures, color photographs, cards, business cards and the like.

The production process of the plastic packaging film is a single-layer extrusion composite process, and the common PET substrate film with the plastic packaging film thickness of 50 mu m is coated and compounded by 30 mu m, but the film coating thickness is generally more than 100 mu m and even up to 250 mu m, the normal extrusion amount is very large, the configuration (diameter of a screw rod) of an extruder is very high in requirement, the capacity is very large, and the speed is very slow, so that the thickness required by film coating can be achieved. For long-term production, the investment on equipment is large, the speed is low, the efficiency is low, and the quality of the produced product is not well ensured.

On the other hand, because of the rapid increase of EVA demand in the photovoltaic industry, EVA in the plastic packaging film industry is always in a state of being in short supply in the last two years, and a great burden is caused to enterprises due to the high price. And the POE structure part is introduced to replace EVA, so that the situation of shortage of raw material supply is relieved, and the production cost can be reduced.

Disclosure of Invention

The utility model aims to: in order to overcome the defects of the background technology, the utility model discloses a multilayer plastic packaging film.

The technical scheme is as follows: the utility model discloses a multilayer plastic packaging film which sequentially comprises a hot melt adhesive layer, a surface treatment layer and a substrate layer from top to bottom, wherein the hot melt adhesive layer is of a three-layer structure and sequentially comprises an EVA layer, a POE layer and an EVA layer.

Further, the thickness of the hot melt adhesive layer is 25-250um.

Further, the hot melt adhesive layer is formed by three-layer coextrusion, and two hot melt resin particles are subjected to melt extrusion by a three-layer coextrusion extruder to be compounded with the substrate layer.

Further, the surface treatment layer is an adhesion promoter, and is obtained by diluting the adhesion promoter with methanol and then transferring and coating the diluted adhesion promoter with an anilox roller.

Further, the substrate layer is a PET layer with a thickness of 25-250um.

The beneficial effects are that: compared with the prior art, the utility model has the advantages that: the POE structure is introduced into the hot melt adhesive layer, so that the production cost can be saved; after POE is introduced, the hot melt adhesive layer is changed from a single layer to three layers, and during production, the hot melt adhesive layers with various thicknesses can be coated on the surface of the base material through three-layer coextrusion, and particularly, the efficiency is higher and the advantage is more obvious under the condition of thicker coating thickness.

Drawings

Fig. 1 is a schematic diagram of the structure of the present utility model.

Detailed Description

The technical scheme of the utility model is further described below with reference to the accompanying drawings and examples.

The multilayer plastic packaging film shown in fig. 1 comprises a hot melt adhesive layer 1, a surface treatment layer 2 and a substrate layer 3 from top to bottom in sequence, wherein the hot melt adhesive layer has a three-layer structure and comprises an EVA layer (ethylene-vinyl acetate), a POE layer (ethylene-octene copolymer) and an EVA layer in sequence, and is formed by three-layer coextrusion.

Wherein the thickness of the hot melt adhesive layer 1 is 25-250um; the surface treatment layer 2 is obtained by diluting an adhesion promoter by 20 times through methanol and performing transfer coating through an anilox roller; the substrate layer 3 is a PET layer (ethylene glycol phthalate) with a thickness of 25-250um.

The preparation method comprises the following steps:

step 1: unreeling of substrate layers

Placing a polyethylene terephthalate (PET) film on an unreeling machine, unreeling the film through an air-expanding shaft, and unreeling the film;

step 2: coating surface treatment layer

Coating the adhesion promoter on a substrate layer in a mode of diluting the adhesion promoter by 20 times through methanol and transferring and coating through an anilox roller, and drying a solvent through a 79-DEG oven;

corona treatment is carried out on the composite surface of the substrate layer polyethylene terephthalate (PET) film through a corona treater;

step 3: three-layer co-extrusion hot-melt layer

Extruding ethylene-vinyl acetate (EVA) hot melt adhesive, ethylene-octene copolymer (POE) and ethylene-vinyl acetate (EVA) hot melt adhesive by using three extruders of the extrusion composite production line respectively, conveying a polyethylene terephthalate (PET) film to a composite station by using guide rollers of the production line, extruding and combining the polyethylene terephthalate (PET) film with the hot melt adhesive cast to the composite station to form a composite film, and cooling the composite film by using a cooling roller;

step 4: winding and forming

Coiled materials are coiled by a coiling machine.

Claims

1. The utility model provides a multilayer plastic envelope membrane which characterized in that: the plastic packaging film sequentially comprises a hot melt adhesive layer (1), a surface treatment layer (2) and a substrate layer (3) from top to bottom, wherein the hot melt adhesive layer is of a three-layer structure and sequentially comprises an EVA layer, a POE layer and an EVA layer.

2. The multilayer plastic packaging film according to claim 1, wherein: the thickness of the hot melt adhesive layer (1) is 25-250um.

3. The multilayer plastic packaging film according to claim 1, wherein: the hot melt adhesive layer (1) is formed by three-layer coextrusion.

4. The multilayer plastic packaging film according to claim 1, wherein: the surface treatment layer (2) is an adhesion promoter.

5. The multilayer plastic packaging film according to claim 1, wherein: the substrate layer (3) is a PET layer with the thickness of 25-250um.