CN110936690A

CN110936690A - Aluminum-plastic composite sheet and preparation method thereof

Info

Publication number: CN110936690A
Application number: CN201911373577.6A
Authority: CN
Inventors: 徐运龙; 王明生; 容龙平
Original assignee: REGO PACKING (GZ) INDUSTRY Co Ltd
Current assignee: REGO PACKING (GZ) INDUSTRY Co Ltd
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2020-03-31

Abstract

The embodiment of the application provides an aluminum-plastic composite sheet and a preparation method thereof, relating to the technical field of packaging materials. The aluminum-plastic composite sheet comprises an outer layer, a first adhesive film layer, a barrier layer, a second adhesive film layer and an inner layer from top to bottom in sequence, wherein the outer layer is a polyethylene film; the first adhesive film layer is a mixed film of ethylene acrylic acid copolymer and polyethylene; the barrier layer is an aluminum foil; the second adhesive film layer is a mixed film of ethylene acrylic acid copolymer and polyethylene; the inner layer is a polyethylene embossing film. The aluminum-plastic composite sheet can achieve the technical effects of reducing the production cost and improving the practicability.

Description

Aluminum-plastic composite sheet and preparation method thereof

Technical Field

The application relates to the technical field of packaging materials, in particular to an aluminum-plastic composite sheet and a preparation method thereof.

Background

At present, with the increasingly wide application of the composite hose, people have higher and higher expectations for the composite hose, and the requirement for excellent performance is more and more strict. The existing composite hose is made of composite sheets, and the existing composite sheets have the problems of rough design and poor practicability.

Disclosure of Invention

The embodiment of the application aims to provide an aluminum-plastic composite sheet and a preparation method thereof, and the aluminum-plastic composite sheet can achieve the technical effects of reducing the production cost and improving the practicability.

In a first aspect, an embodiment of the present application provides an aluminum-plastic composite sheet, which includes, from top to bottom, an outer layer, a first adhesive film layer, a barrier layer, a second adhesive film layer, and an inner layer, where the outer layer is a polyethylene film; the first adhesive film layer is a mixed film of ethylene acrylic acid copolymer and polyethylene; the barrier layer is an aluminum foil; the second adhesive film layer is a mixed film of ethylene acrylic acid copolymer and polyethylene; the inner layer is a polyethylene embossing film.

In the implementation process, the inner layer of the aluminum-plastic composite sheet adopts a polyethylene embossed film, the surface gloss of the film is low, and the visual sense is comfortable; compared with other existing plastic sheets, the base film produced by the aluminum-plastic composite sheet has small tolerance, smooth surface and high production efficiency; in addition, the surface texture of the polyethylene embossed film can obviously improve the friction coefficient of the inner film of the plastic product, thereby improving the smoothness when manufacturing the hose. Therefore, the aluminum-plastic composite sheet can reduce the production cost and improve the technical effect of practicability.

Further, the outer layer of sheet is provided with two at least lines of shrinkage pools, be parallel to each other and dislocation arrangement between two at least lines of shrinkage pools.

In the above-mentioned realization process, through setting up several lines of shrinkage pools at the ectonexine, can effectively improve this aluminum-plastic composite sheet's coefficient of friction, promote and feel to increase user of service's experience and feel.

Furthermore, the concave hole is a round concave hole, and the diameter of the round concave hole is 0.10-0.15 mm.

In the implementation process, the concave hole is a circular concave hole, the diameter of the circular concave hole is 0.10-0.15mm, and the aluminum-plastic composite sheet can be conveniently produced, so that the production cost is reduced.

Furthermore, the distance between the concave holes in the same row is 0.12 mm-0.2 mm.

In the implementation process, the distance between the concave holes in the same row is set between 0.12mm and 0.2mm, so that hand feeling can be further improved, and the experience feeling of users is further increased.

Further, the inlayer of sheet is provided with two at least lines of lugs, the position and the shape of lug with one-to-one between the shrinkage pool.

In the implementation process, the inner layer of the aluminum-plastic composite sheet is provided with the convex blocks, and the positions of the convex blocks correspond to the concave holes one by one, so that on one hand, the production of the aluminum-plastic composite sheet is facilitated, and the production cost is reduced; on the other hand, the surface texture on the inner layer can obviously improve the friction coefficient of the inner film of the aluminum-plastic composite sheet, thereby improving the fluency when manufacturing the hose.

Further, the thickness ratio of each layer of the sheet is as follows: the outer layer is 15-50%, the first adhesive film layer is 10-20%, the blocking layer is 10-30%, the second adhesive film layer is 10-20%, the inner layer is 15-35%, and the sum of the proportion of the layers is 100%.

In the above implementation, by setting the thickness ratio of the sheet material to the above range, the sheet material can be used as a packaging material without being affected, and the production cost can be further reduced.

Further, the thickness of the sheet is 0.1-1.0 mm.

In the above implementation, by setting the thickness of the sheet material to the above range, the sheet material can be used as a packaging material without being affected, and the production cost can be further reduced.

In a second aspect, embodiments of the present application provide a method for preparing an aluminum-plastic composite sheet according to the first aspect, the method including:

mixing the raw material components of the outer layer, the first adhesive film layer, the barrier layer, the second adhesive film layer and the inner layer respectively;

respectively melting the raw material components of the outer layer, the first sticky film layer, the barrier layer, the second sticky film layer and the inner layer at the temperature of 150-185 ℃ to respectively form sticky raw material components;

respectively conveying and converging the viscose raw material components to a film blowing die head, and extruding and compounding the outer layer, the first viscose layer, the barrier layer, the second viscose layer and the inner layer through the film blowing die head to form a tubular die blank, wherein the temperature of the film blowing die head is 190 ℃;

and performing blowing, cooling and shaping, trimming and rolling operations on the tubular mold blank to obtain the sheet.

In the implementation process, after the raw materials of the outer layer, the first adhesive film layer, the barrier layer, the second adhesive film layer and the inner layer are respectively melted, five extruders respectively extrude the melted raw materials of the outer layer, the first adhesive film layer, the barrier layer, the second adhesive film layer and the inner layer; specifically, five extruders extrude and mold an outer layer, a first adhesive film layer, a barrier layer, a second adhesive film layer and an inner layer into a tubular film blank, convey and converge the tubular film blank to a film blowing die head, blow-expand a tubular film to a required thickness through high-pressure air in a better melt flowing state through the film blowing die head, and form the tubular film into a thin film after cooling and shaping; and finally, cutting edges and winding the cooled and shaped film to obtain the aluminum-plastic composite sheet.

Further extrusion compounding the outer layer, the first tie-film layer, the barrier layer, the second tie-film layer, and the inner layer through the blown film die, comprising:

extruding and compounding the inner layer and the barrier layer through the second adhesive film layer, wherein the parameters are as follows: the extrusion compounding temperature is 135-280 ℃, and the compounding pressure is 3.0-7.0 bar.

In the implementation process, the inner layer and the barrier layer are subjected to extrusion compounding operation through the second adhesive film layer.

extruding and compounding the outer layer, the compounded inner layer and the barrier layer through the first adhesive film layer, wherein the parameters are as follows: the extrusion compounding temperature is 190-290 ℃, and the compounding pressure is 2.5-6.5 bar.

In the implementation process, the outer layer and the barrier layer are subjected to extrusion compounding operation through the first adhesive film layer; in addition, the operation of extruding and compounding the inner layer and the barrier layer is firstly carried out, and then the operation of extruding and compounding the outer layer and the compounded inner layer and barrier layer is carried out, so that the process flow of the sheet is optimized, the composite extrusion operation can be carried out between the inner layer and the barrier layer and between the outer layer and the barrier layer at different extrusion compounding temperatures, and the performance of the sheet is improved.

Additional features and advantages of the disclosure will be set forth in the description which follows, or in part may be learned by the practice of the above-described techniques of the disclosure, or may be learned by practice of the disclosure.

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of an aluminum-plastic composite sheet provided in an embodiment of the present application;

fig. 2 is a schematic flow chart of a method for manufacturing an aluminum-plastic composite sheet according to an embodiment of the present disclosure;

fig. 3 is a schematic flow chart of a method for manufacturing an aluminum-plastic composite sheet according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.

According to the aluminum-plastic composite sheet and the preparation method thereof, the aluminum-plastic composite sheet can be suitable for packaging toothpaste, medicines, cosmetics and other articles, and has the technical effects of high composite strength and soft sheet handfeel. The inner layer of the aluminum-plastic composite sheet adopts a polyethylene embossed film, the surface gloss of the film is low, and the visual sense is comfortable; compared with other existing plastic sheets, the base film produced by the aluminum-plastic composite sheet has small tolerance, smooth surface and high production efficiency; in addition, the surface texture of the polyethylene embossed film can obviously improve the friction coefficient of the inner film of the plastic product, thereby improving the smoothness of pipe making. Therefore, the aluminum-plastic composite sheet can reduce the production cost and improve the technical effect of practicability.

Referring to fig. 1, fig. 1 is a schematic structural view of an aluminum-plastic composite sheet provided in an embodiment of the present application, where the aluminum-plastic composite sheet includes, from top to bottom, an outer layer 100, a first adhesive film layer 200, a barrier layer 300, a second adhesive film layer 400, and an inner layer 500, which are sequentially stacked.

The outer layer 100 is illustratively a Polyethylene (PE) film, wherein the PE is a thermoplastic resin prepared by polymerizing ethylene, and the PE also comprises a copolymer of ethylene and a small amount of α -olefin in industry, and the PE has no odor, is non-toxic, feels like wax, has excellent low temperature resistance (the lowest using temperature can reach-100 to-70 ℃), has good chemical stability, can resist the corrosion of most acid and alkali (cannot resist acid with oxidation property), is insoluble in common solvents at normal temperature, has small water absorption and has excellent electric insulation.

Illustratively, the first adhesive film layer 200 is a mixed film of an ethylene acrylic acid copolymer and polyethylene. Among them, Ethylene Acrylic Acid (EAA) is a polymer with thermoplasticity and extremely high adhesiveness, because of the existence of carboxyl group and the function of hydrogen bond, the crystallization of the polymer is inhibited, the linearity of the main chain is destroyed, thus improving the transparency and toughness of EAA, lowering the melting point and softening point; in the ethylene Acrylic Acid copolymer, when the Melt Index (MI) is the same, the transparency, toughness, adhesion, environmental stress crack resistance of EAA increase with the increase of the content of Acrylic Acid (AA); conversely, its rigidity, moisture vapor transmission, creep resistance, chemical resistance will be better; when the AA content is the same, the adhesiveness and the processability of the EAA are better along with the increase of MI; conversely, the toughness and environmental stress cracking resistance are increased.

Illustratively, the barrier layer 300 is aluminum foil. The aluminum foil is a hot stamping material which is directly rolled into a sheet by using metal aluminum, and the hot stamping effect of the aluminum foil is similar to that of a pure silver foil, so the aluminum foil is also called a false silver foil. Aluminum has a soft texture, good ductility, silvery white luster, and excellent characteristics, and thus is widely used as a packaging material for foods, medicines, and household goods. Because the aluminum foil has excellent blocking performance and low cost, the blocking layer 300 of the aluminum-plastic composite sheet can effectively improve the practicability of the aluminum-plastic composite sheet while reducing the production cost by adopting the aluminum foil.

Illustratively, the second adhesive film layer 400 is a mixed film of an ethylene acrylic acid copolymer and polyethylene. It should be understood that the raw material components of the second adhesive film layer 400 are the same as those of the first adhesive film layer 200, and have been described above, and are not repeated herein to avoid repetition.

Illustratively, the inner layer 500 is a polyethylene embossed film. The formability and the isolation of the polyethylene embossed film are superior to those of common materials such as common PVC (Polyvinyl chloride), PP (Polypropylene) and the like, so that the inner layer 500 of the aluminum-plastic composite sheet adopts the polyethylene embossed film, the isolation and the formability can be effectively improved, and the practicability of the aluminum-plastic composite sheet is improved.

In some embodiments, the outer layer 100 of the aluminum-plastic composite sheet is provided with at least two rows of concave holes, and the at least two rows of concave holes are parallel to each other and are arranged in a staggered manner.

Optionally, the concave holes in the outer layer 100 of the aluminum-plastic composite sheet are circular concave holes, and the diameter of each circular concave hole is 0.10-0.15 mm.

Optionally, the distance between the same row of concave holes on the outer layer 100 of the aluminum-plastic composite sheet is between 0.12mm and 0.2 mm.

Optionally, the inner layer of the sheet is provided with at least two rows of bumps, and the positions and shapes of the bumps correspond to those of the concave holes one by one.

In some embodiments, a plurality of rows of concave holes are arranged on the outer layer 100 of the aluminum-plastic composite sheet, two adjacent rows of concave holes are arranged in a staggered manner, the concave holes are of a circular structure, the diameters of the concave holes of the circular structure are all between 0.10 and 0.15mm, and the distance between the centers of circles of two adjacent concave holes in the same row is between 0.12 and 0.2 mm; the inner layer 500 of the aluminum-plastic composite embossed film is provided with a plurality of rows of bumps, and the shapes and the sizes of the bumps are respectively matched with those of the concave holes on the outer layer 100 of the aluminum-plastic composite sheet. It should be noted that the odd-numbered lines of concave holes of the aluminum-plastic composite sheet are aligned with each other, and the even-numbered lines of concave holes are aligned with each other.

In some implementations, the aluminum-plastic composite sheet is used to make composite hoses for packaging of food, pharmaceuticals, or household goods. In the aluminum-plastic composite sheet, the surface texture can obviously improve the friction coefficient of an inner film of a plastic product, thereby improving the smoothness of pipe making; the polyethylene embossed film has high material strength, good flexibility and low production cost, and can be pressed into special logo, grinding tool number and even special code or anti-counterfeiting mark. Therefore, the aluminum-plastic composite sheet can effectively improve the technical effect of practicability while reducing the production cost.

In some embodiments, the thickness ratio of each layer of the aluminum-plastic composite sheet is: 15-50% of the outer layer 100, 10-20% of the first adhesive film layer 200, 10-30% of the barrier layer 300, 10-20% of the second adhesive film layer 400, 15-35% of the inner layer 500, and the sum of the proportions of the layers is 100%.

By way of example and not limitation, in alternative embodiments the ratio of the thicknesses of the layers of the sheet may be: 15% of the outer layer 100, 10% of the first adhesive film layer 200, 30% of the barrier layer 300, 10% of the second adhesive film layer 400, 35% of the inner layer 500, and the sum of the proportions of the layers being 100%.

In some embodiments, the thickness of the aluminum-plastic composite sheet is between 0.1 mm and 1.0 mm.

By way of example and not limitation, in alternative embodiments, the thickness of the aluminum-plastic composite sheet may be 0.1 mm, 0.2mm, 0.4mm, 0.8mm, 1.0mm, and the like, and specifically, aluminum-plastic composite sheets with different thicknesses may be produced according to different requirements.

Referring to fig. 2, fig. 2 is a schematic flow chart of a method for manufacturing an aluminum-plastic composite sheet according to an embodiment of the present application, where the method includes:

step S100: the raw material components of the outer layer 100, the first adhesive film layer 200, the barrier layer 300, the second adhesive film layer 400 and the inner layer 500 are mixed, respectively.

Step S200: the raw material components of the outer layer 100, the first adhesive film layer 200, the barrier layer 300, the second adhesive film layer 400 and the inner layer 500 are respectively melted at the temperature of 150-185 ℃ to respectively form adhesive raw material components.

Step S300: respectively conveying and converging the viscose raw material components to a film blowing die head, extruding and compounding the outer layer 100, the first viscose layer 200, the barrier layer 300, the second viscose layer 400 and the inner layer 500 through the film blowing die head to form a tubular die blank, wherein the temperature of the film blowing die head is 190 ℃.

Step S400: and (5) performing blowing, cooling and shaping, trimming and rolling on the tubular mold blank to obtain the sheet.

Illustratively, after the raw materials of the outer layer 100, the first adhesive film layer 200, the barrier layer 300, the second adhesive film layer 400 and the inner layer 500 are respectively melted, five extruders respectively extrude the melted raw materials of the outer layer 100, the first adhesive film layer 200, the barrier layer 300, the second adhesive film layer 400 and the inner layer 500; specifically, five extruders extrude and form a tubular film blank from the outer layer 100, the first adhesive film layer 200, the barrier layer 300, the second adhesive film layer 400 and the inner layer 500, convey and converge to a film blowing die head, blow-expand the tubular film to a required thickness through high-pressure air in a better melt flowing state through the film blowing die head, and form the tubular film after cooling and shaping; and finally, cutting edges and winding the cooled and shaped film to obtain the aluminum-plastic composite sheet.

Illustratively, the operating temperature of the film blowing die during film blowing is 190 ℃, and the winding tension of the outer layer 100, the first adhesive film layer 200, the barrier layer 300, the second adhesive film layer 400 and the inner layer 500 during conveying and converging to the film blowing die is 7kgf, so that the extrusion compounding operation of the outer layer 100, the first adhesive film layer 200, the barrier layer 300, the second adhesive film layer 400 and the inner layer 500 is better performed.

In some embodiments, in the step S300, the outer layer 100, the first adhesive film layer 200, the barrier layer 300, the second adhesive film layer 400 and the inner layer 500 are extrusion-compounded through a film blowing die, and after the extrusion compounding operation is performed between the inner layer 500 and the barrier layer 300, the extrusion compounding operation is performed between the outer layer 100 and the compounded inner layer 500 and barrier layer 300; it should be noted that the inner layer 500 and the barrier layer 300 are combined through the second adhesive film layer 400, and the outer layer 100 and the barrier layer 300 are combined through the first adhesive film layer 200.

Referring to fig. 3, fig. 3 is a schematic flow chart of a method for manufacturing an aluminum-plastic composite sheet according to an embodiment of the present application, where the method includes:

step S310: the inner layer 500 and the barrier layer 300 are extruded and compounded through the second adhesive film layer 400, and the parameters are as follows: the extrusion compounding temperature is 135-280 ℃, and the compounding pressure is 3.0-7.0 bar.

Optionally, in step S310, the inner layer 500 and the barrier layer 300 are extrusion-compounded through the second adhesive film layer 400, which further includes the parameters: the unreeling tension is 16-22kgf, and the reeling tension is 27-36 kgf.

Step S320: the outer layer 100 is extrusion compounded with the compounded inner layer 500 and the barrier layer 300 through the first adhesive film layer, and the parameters are as follows: the extrusion compounding temperature is 190-290 ℃, and the compounding pressure is 2.5-6.5 bar.

Optionally, in step S320, the outer layer 100 is extrusion-compounded with the compounded inner layer 500 and barrier layer 300 through the first adhesive layer, which further includes the parameters: unwinding tension: 18-24kgf, winding tension: 28-36 kgf.

Illustratively, by the above manner, the extrusion compounding operation is performed between the inner layer 500 and the barrier layer 300, and then the extrusion compounding operation is performed between the outer layer 100 and the compounded inner layer 500 and barrier layer 300, so as to optimize the process flow of the aluminum-plastic composite sheet, so that the extrusion compounding operation can be performed between the inner layer 500 and the barrier layer 300, and between the outer layer 100 and the barrier layer 300 at different extrusion compounding temperatures, and further improve the performance of the aluminum-plastic composite sheet.

In some implementation scenarios, the aluminum-plastic composite sheet comprises, from top to bottom, an outer layer 100, a first adhesive film layer 200, a barrier layer 300, a second adhesive film layer 400, and an inner layer 500, wherein the barrier layer 300 of the aluminum-plastic composite sheet is an aluminum foil, the inner layer 500 is a polyethylene embossed film, and the polyethylene embossed film has low surface gloss and comfortable visual sensation; compared with other existing plastic sheets, the base film produced by the aluminum-plastic composite sheet has small tolerance, smooth surface and high production efficiency; in addition, the surface texture of the polyethylene embossing film can obviously improve the friction coefficient of the inner film of the plastic product, thereby improving the smoothness of tube making, and the production cost is low, and in addition, special logo, grinding tool number and even specific code or anti-counterfeiting mark can be extruded. In the preparation process of the aluminum-plastic composite sheet, the welding seam between each layer of the sheet can be kept firm while the extrusion compounding temperature is lower. Therefore, through the mode, the technical effect of improving the practicability can be realized while the production cost is reduced.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

In addition, functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Claims

1. An aluminum-plastic composite sheet is characterized by comprising an outer layer, a first adhesive film layer, a barrier layer, a second adhesive film layer and an inner layer from top to bottom in sequence,

the outer layer is a polyethylene film;

the first adhesive film layer is a mixed film of ethylene acrylic acid copolymer and polyethylene;

the barrier layer is an aluminum foil;

the second adhesive film layer is a mixed film of ethylene acrylic acid copolymer and polyethylene;

the inner layer is a polyethylene embossing film.

2. The aluminum-plastic composite sheet according to claim 1, wherein the outer layer of the sheet is provided with at least two rows of concave holes, and the at least two rows of concave holes are parallel to each other and are arranged in a staggered manner.

3. The aluminum-plastic composite sheet according to claim 2, wherein the concave holes are circular concave holes, and the diameter of the circular concave holes is between 0.10 mm and 0.15 mm.

4. The aluminum-plastic composite sheet according to claim 2, wherein the distance between the concave holes in the same row is 0.12mm to 0.2 mm.

5. The aluminum-plastic composite sheet according to claim 2, wherein the inner layer of the sheet is provided with at least two rows of projections, and the projections are in one-to-one correspondence with the recesses.

6. The aluminum-plastic composite sheet according to claim 1, wherein the thickness ratio of each layer of the sheet is: the outer layer is 15-50%, the first adhesive film layer is 10-20%, the blocking layer is 10-30%, the second adhesive film layer is 10-20%, the inner layer is 15-35%, and the sum of the proportion of the layers is 100%.

7. The aluminum-plastic composite sheet according to claim 6, wherein the sheet has a thickness of 0.1 to 1.0 mm.

8. A method for preparing the aluminum-plastic composite sheet according to any one of claims 1 to 7, wherein the method comprises:

9. The method of manufacturing an aluminum-plastic composite sheet according to claim 8, wherein extrusion compounding the outer layer, the first adhesive film layer, the barrier layer, the second adhesive film layer and the inner layer through the film blowing die comprises:

10. The method for preparing the aluminum-plastic composite sheet according to claim 9, wherein the extrusion lamination of the outer layer, the first adhesive film layer, the barrier layer, the second adhesive film layer and the inner layer through the film blowing die head comprises: