阅读说明：本技术 一种复合包装膜及其制备方法 (Composite packaging film and preparation method thereof ) 是由 许兴林 于 2020-03-30 设计创作，主要内容包括：本发明公开了一种复合包装膜及其制备方法,包括PET膜和第一粘合层,所述PET膜通过第一粘合层与金属层连接,所述金属层通过第二粘合层与阻隔层连接,所述阻隔层通过第三粘合层与PA膜连接,所述PA膜通过第四粘合层与PE膜连接。本发明,各层之间通过粘合层连接,且粘合层采用的是聚氨酯粘合剂层,增强了各层之间的紧密粘结,且高温蒸煮不易脱离；通过设置PET膜、金属层、阻隔层、PA膜和PE膜,增强了包装膜的强度和抗拉伸性能；通过在金属层上刻蚀图案,可根据需要刻蚀防伪标识、公司信息或产品信息等,使得包装膜的功能更加丰富。(The invention discloses a composite packaging film and a preparation method thereof, wherein the composite packaging film comprises a PET film and a first bonding layer, the PET film is connected with a metal layer through the first bonding layer, the metal layer is connected with a barrier layer through a second bonding layer, the barrier layer is connected with a PA film through a third bonding layer, and the PA film is connected with a PE film through a fourth bonding layer. According to the invention, the layers are connected through the bonding layer, and the bonding layer adopts the polyurethane adhesive layer, so that the tight bonding among the layers is enhanced, and the layers are not easy to separate after being cooked at high temperature; the strength and the tensile resistance of the packaging film are enhanced by arranging the PET film, the metal layer, the barrier layer, the PA film and the PE film; by etching the patterns on the metal layer, the anti-counterfeiting mark, the company information or the product information and the like can be etched as required, so that the function of the packaging film is richer.)

1. A composite packaging film comprising a PET film (1) and a first adhesive layer (2), characterized in that: PET membrane (1) is connected with metal level (3) through first bond line, metal level (3) are connected with barrier layer (5) through second bond line (4), barrier layer (5) are connected with PA membrane (7) through third bond line (6), PA membrane (7) are connected with PE membrane (9) through fourth bond line (8).

2. The composite packaging film of claim 1, wherein: the first bonding layer (2), the second bonding layer (4), the third bonding layer (6) and the fourth bonding layer (8) are identical in structure, and polyurethane adhesives are adopted in the first bonding layer (2), the second bonding layer (4), the third bonding layer (6) and the fourth bonding layer (8).

3. The composite packaging film of claim 1, wherein: the metal layer (3) is arranged to be an aluminum foil, and the pattern layer is etched on the metal layer (3).

4. The composite packaging film of claim 1, wherein: the barrier layer (5) is provided as a PVDC film.

5. The method for preparing a composite packaging film according to claim 1, wherein: the method comprises the following steps:

step S1: preparing a PET film (1), a metal layer (3), a barrier layer (5), a PA film (7) and a PE film (9);

step S2: etching a pattern on the metal layer (3);

step S3: compounding the barrier layer (5), the PA film (7) and the PE film (9) to form a first composite layer;

step S4: the PET film (1), the metal layer (3) and the first composite layer are connected through a first adhesive layer (2) and a second adhesive layer (4) respectively.

6. The composite packaging film and the preparation method thereof according to claim 5, wherein the composite packaging film comprises the following components: in step S1, the metal layer (3) is provided as an aluminum foil, and the barrier layer (5) is provided as a PVDC film.

7. The composite packaging film and the preparation method thereof according to claim 6, wherein the composite packaging film comprises: the PET film (1), the PVDC film, the PA film (7) and the PE film (9) are all prepared by adopting a film blowing process, and the aluminum foil is prepared by adopting a hot-press forming process.

8. The composite packaging film and the preparation method thereof according to claim 5, wherein the composite packaging film comprises the following components: when the barrier layer (5), the PA film (7) and the PE film (9) are compounded in the step S3, a third bonding layer (6) and a fourth bonding layer (8) are respectively coated between adjacent films, then the adjacent films are bonded, rolled and cured, the first bonding layer (2), the second bonding layer (4), the third bonding layer (6) and the fourth bonding layer (8) are all set to be polyurethane bonding agent layers, the thicknesses of the first bonding layer (2), the second bonding layer (4), the third bonding layer (6) and the fourth bonding layer (8) are all set to be 1.5-2.5 micrometers, and when the PET film (1), the metal layer (3) and the first composite layer are connected in the step S4, bonding layers are coated on two sides of the metal layer (3), and then the bonding, rolling and curing are carried out.

Technical Field

The invention relates to the technical field of packaging films, in particular to a composite packaging film and a preparation method thereof.

Background

In production, many products are packaged in packaging bags for storage, transportation of boxes, and the like, and particularly for granular and powdery materials, packaging bags are required. However, in the actual storage, transportation or transportation links, the packaging bag is sometimes broken due to carelessness, or the number of stacked layers is limited due to the strength of the packaging bag, which is not suitable for too high, and even when the packaging bag is filled with materials, the packaging bag is directly broken due to too high material flushing speed, which affects the production safety and smoothness. The packaging bag is formed by heat sealing of a packaging film, and the quality of the packaging film directly influences the quality of the packaging bag.

The existing packaging film has small tensile strength and is easy to damage after being steamed.

Disclosure of Invention

The invention aims to provide a composite packaging film and a preparation method thereof, which aim to solve the problems in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a composite packaging film, includes PET membrane and first bond line, the PET membrane is connected with the metal level through first bond line, the metal level passes through the second bond line and is connected with the barrier layer, the barrier layer passes through the third bond line and is connected with the PA membrane, the PA membrane passes through the fourth bond line and is connected with the PE membrane.

Preferably, the first adhesive layer, the second adhesive layer, the third adhesive layer and the fourth adhesive layer have the same structure, and a polyurethane adhesive is used for the first adhesive layer, the second adhesive layer, the third adhesive layer and the fourth adhesive layer.

Preferably, the metal layer is an aluminum foil, and the pattern layer is etched on the metal layer.

Preferably, the barrier layer is provided as a PVDC film.

Preferably, the preparation method of the composite packaging film comprises the following steps:

step S1: preparing a PET film, a metal layer, a barrier layer, a PA film and a PE film;

step S2: etching a pattern on the metal layer;

step S3: compounding the barrier layer, the PA film and the PE film to form a first composite layer;

step S4: and connecting the PET film, the metal layer and the first composite layer through a first adhesive layer and a second adhesive layer respectively.

Preferably, the metal layer is an aluminum foil and the barrier layer is a PVDC film in step S1.

Preferably, the PET film, the PVDC film, the PA film and the PE film are all prepared by a film blowing process, and the aluminum foil is prepared by a hot-press molding process.

Preferably, when the barrier layer, the PA film and the PE film are combined in step S3, a third adhesive layer and a fourth adhesive layer are respectively coated between adjacent films, and then the first adhesive layer, the second adhesive layer, the third adhesive layer and the fourth adhesive layer are formed as polyurethane adhesive layers by bonding, rolling and curing, wherein the thicknesses of the first adhesive layer, the second adhesive layer, the third adhesive layer and the fourth adhesive layer are all set to be 1.5-2.5 μm, and when the PET film, the metal layer and the first composite layer are connected in step S4, after the adhesive layers are coated on both sides of the metal layer, the bonding, rolling and curing are performed.

Compared with the prior art, the invention has the beneficial effects that:

1. the layers are connected through the bonding layer, the polyurethane adhesive layer is adopted as the bonding layer, so that the tight bonding among the layers is enhanced, and the layers are not easy to separate after being cooked at high temperature;

2. the strength and the tensile resistance of the packaging film are enhanced by arranging the PET film, the metal layer, the barrier layer, the PA film and the PE film, and the barrier property of the packaging film is stronger;

3. by etching the patterns on the metal layer, the anti-counterfeiting mark, the company information or the product information and the like can be etched as required, so that the function of the packaging film is richer.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram of a first embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a second embodiment of the present invention.

In the figure: 1. a PET film; 2. a first adhesive layer; 3. a metal layer; 4. a second adhesive layer; 5. a barrier layer; 6. a third adhesive layer; 7. a PA film; 8. a fourth adhesive layer; 9. and (3) PE films.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.