Aluminum plastic film and method for producing the same

Abstract

To provide an aluminum plastic film and method for producing the same.SOLUTION: A method for producing an aluminum plastic film includes: a preparing step implemented by providing an aluminum foil metal film having a first surface and a second layer; a polyurethane glue coating step implemented by coating a polyurethane glue onto the first surface of the aluminum foil metal film; an outer-layer polymer film pasting step implemented by pasting an outer-layer polymer film onto the first surface through the polyurethane glue; a polyolefin glue coating step implemented by coating a polyolefin glue onto the second surface of the aluminum foil metal film; and an inner-layer polymer film pasting step implemented by pasting an inner-layer polymer film onto the second surface through the polyolefin glue to form an aluminum plastic film. A ratio between a thickness of the inner-layer polymer film and a thickness of the outer-layer polymer film is between 1.6 and 5.5.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an aluminum-plastic film and a manufacturing method thereof, and more particularly to an aluminum-plastic film applicable to a large punching depth and a manufacturing method thereof. [Background technology]

[0002] Conventional aluminum-plastic films have the problem of being prone to significant warping or holes after being punched to a large punching depth. More specifically, when conventional aluminum-plastic films are applied to battery products with a large punching depth, holes in the conventional aluminum-plastic films can lead to leakage of battery fluid, and warped conventional aluminum-plastic films can severely affect the production efficiency of battery products. Summary of the Invention [Problem to be solved by the invention]

[0003] The technical problem that the present invention aims to solve is to provide an aluminum-plastic film and a manufacturing method thereof that addresses the shortcomings of the prior art and improves the problem that significant warping or holes tend to occur when conventional aluminum-plastic films are applied to battery products with a high punching depth. [Means for solving the problem]

[0004] To solve the above technical problems, one technical means adopted by the present invention is to provide a method for manufacturing an aluminum-plastic film, which includes a preparation step of providing an aluminum foil metal film having a first surface and a second surface, a polyurethane adhesive application step of applying a polyurethane adhesive to the first surface of the aluminum foil metal film, an outer layer polymer film laminating step of laminating an outer layer polymer film, which is at least one of a nylon polymer film, a polyester polymer film, and a nylon / polyester polymer multilayer film, to the first surface via the polyurethane adhesive, a polyolefin adhesive application step of applying a polyolefin adhesive to the second surface of the aluminum foil metal film, and an inner layer polymer film laminating step of laminating an inner layer polymer film, which is a polyolefin polymer film, to the second surface via the polyolefin adhesive to form an aluminum-plastic film, wherein the ratio of the thickness of the inner layer polymer film to the thickness of the outer layer polymer film (thickness of the inner layer polymer film / thickness of the outer layer polymer film) is 1.6 to 5.5.

[0005] Preferably, the manufacturing method for the aluminum plastic film further includes a preheating step of preheating the outer layer polymer film at a temperature of 140°C to 180°C for 10 seconds to 30 seconds before performing the step of bonding the outer layer polymer film, and the thickness of the outer layer polymer film is 20 μm to 25 μm.

[0006] Preferably, after the preheating step, the shrinkage rate of the outer polymer film in the longitudinal direction is 1% or less, and the shrinkage rate of the outer polymer film in the lateral direction is 1% or less.

[0007] Preferably, the thickness of the outer polymer film is 10 μm to 20 μm.

[0008] Preferably, the manufacturing method of the aluminum plastic film further includes a polyurethane adhesive aging process, after the process of laminating the outer layer polymer film, in which the aluminum foil metal film to which the outer layer polymer film has been laminated is left standing in an environment of 45°C to 65°C for 84 hours to 108 hours.

[0009] Preferably, the maturation step of the polyurethane adhesive is divided into a resting stage for a first polyurethane adhesive, a resting stage for a second polyurethane adhesive, and a resting stage for a third polyurethane adhesive, the resting time in the resting stage for the third polyurethane adhesive is longer than the resting time in the resting stage for the first polyurethane adhesive and the resting time in the resting stage for the second polyurethane adhesive, the resting temperature in the resting stage for the third polyurethane adhesive is higher than the resting temperature in the resting stage for the second polyurethane adhesive, and the resting temperature in the resting stage for the second polyurethane adhesive is higher than the resting temperature in the resting stage for the first polyurethane adhesive.

[0010] Preferably, the manufacturing method of the aluminum plastic film further includes a polyolefin adhesive aging process, after the process of bonding the inner layer polymer film, in which the aluminum foil metal film to which the inner layer polymer film has been bonded is left standing in an environment of 40°C to 55°C for 84 hours to 108 hours.

[0011] Preferably, the aging process of the polyolefin adhesive is divided into a resting stage for the first polyolefin adhesive and a resting stage for the second polyolefin adhesive, the resting temperature in the resting stage for the second polyolefin adhesive is higher than the resting temperature in the resting stage for the first polyolefin adhesive, and the resting time in the resting stage for the second polyolefin adhesive is equal to or longer than the resting time in the resting stage for the first polyolefin adhesive.

[0012] Preferably, after punching to a punching depth of 5 mm, the appearance of the aluminum plastic film does not have significant warping or holes. [Effects of the Invention]

[0013] An advantageous effect of the present invention is that the aluminum-plastic film and its manufacturing method of the present invention have the technical feature that "the ratio of the thickness of the inner layer polymer film to the thickness of the outer layer polymer film is 1.6 to 5.5," thereby improving the problem of significant warping or holes occurring when conventional aluminum-plastic films are applied to battery products with a high punching depth. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a schematic diagram of an aluminum plastic film according to the present invention. [Figure 2] FIG. 2 is a flowchart of the method for producing an aluminum plastic film according to the first embodiment of the present invention. [Figure 3] FIG. 3 is a flowchart of a method for producing an aluminum plastic film according to a second embodiment of the present invention. [Figure 4] FIG. 4 is a flowchart of a method for producing an aluminum plastic film according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] To better understand the features and technical contents of the present invention, please refer to the following detailed description of the present invention and the accompanying drawings, which are provided for reference and explanation only and are not intended to limit the scope of the present invention.

[0016] The following describes the "aluminum-plastic film and its manufacturing method" according to certain specific embodiments of the present invention, and those skilled in the art can understand the advantages and effects of the present invention based on the content disclosed herein. The present invention can be implemented or applied in other different specific embodiments, and various modifications and changes can be made to the details herein based on different perspectives and applications without departing from the concept of the present invention. Also, as previously mentioned, the accompanying drawings of the present invention are for simple schematic illustrations and are not drawn to actual size. The technical content of the present invention will be described in more detail based on the following embodiments, but the disclosed content does not limit the scope of protection of the present invention.

[0017] It should be understood that although the present specification may use terms such as "first," "second," and "third" to describe various elements or signals, these elements or signals are not limited by these terms. These terms are primarily used to distinguish one element from another element or one signal from another signal. Furthermore, the term "or" used in the present specification may include any one or more combinations of the associated listed items, depending on the actual situation.

[0018] [First embodiment] As shown in Figures 1 and 2, Figure 1 is a schematic diagram of the aluminum-plastic film of the present invention, and Figure 2 is a flowchart of the manufacturing method of the aluminum-plastic film according to the first embodiment of the present invention. In the first embodiment of the present invention, the manufacturing method of the aluminum-plastic film includes a preparation step S110, a polyurethane adhesive application step S120, an outer layer polymer film lamination step S130, a polyolefin adhesive application step S140, and an inner layer polymer film lamination step S150.

[0019] In the preparation step S110, an aluminum foil metal film 1 having a first surface 1a and a second surface 1b is provided. The aluminum foil metal film 1 may have, for example, a composite structure, but the specific structure of the aluminum foil metal film of the present invention is not limited. For example, the aluminum foil metal film 1 may include an aluminum foil layer (not shown in the drawings) and two anticorrosion layers (not shown in the drawings) formed on both sides of the aluminum foil layer. The anticorrosion layers can prevent the aluminum foil layer from rusting. The material of the anticorrosion layer may be, for example, an inorganic paint or an organic-inorganic paint, but the present invention is not limited thereto. For example, the anticorrosion layer may be, for example, a phosphate layer.

[0020] In the polyurethane adhesive application step S120, a polyurethane adhesive 2 is applied to the first surface 1a of the aluminum foil metal film 1. The polyurethane adhesive 2 is formed, for example, by reacting a polyol material with an isocyanate material, but the present invention does not limit the specific components of the polyurethane adhesive 2. The polyol material may have, for example, a weight-average molecular weight of 25,000 to 75,000, a number-average molecular weight of 18,000 to 55,000, and a glass transition temperature of -30°C to 60°C. The isocyanate material may include a first isocyanate component, which is an adduct of toluene diisocyanate (TDI) and a C4 to C15 polyol with functionality 2 to 4. The isocyanate material may further include a second isocyanate component formed by adding a polyol with a long carbon chain and functionality 2 to 4 to an isocyanate.

[0021] In step S130 of attaching the outer layer polymer film, an outer layer polymer film 3 is attached to the first surface via the polyurethane adhesive 2. The outer layer polymer film 3 is at least one of a nylon polymer film, a polyester polymer film, and a nylon / polyester multilayer polymer film. The outer layer polymer film 3 may also be at least one of a multilayer co-extruded polymer film and a blown film, for example.

[0022] In the polyolefin adhesive application step S140, a polyolefin adhesive 4 is applied to the second surface of the aluminum foil metal film 1. The polyolefin adhesive 4 may include, for example, a modified polyolefin polymer and a curing agent. The amount of curing agent added may be 1 to 10 parts by weight per 100 parts by weight of the modified polyolefin polymer. The type of curing agent can be selected as needed. For example, the curing agent is a polyisocyanate-based curing agent, such as Desmodur (registered trademark) ultra N 3300, but the present invention is not limited thereto.

[0023] The modified polyolefin polymer may be a propylene random copolymer obtained by polymerizing a propylene monomer with another monomer. The proportion of the propylene monomer exceeds 50% by weight, where the total weight of the propylene random copolymer is 100% by weight. The propylene random copolymer may be obtained by polymerizing an ethylene monomer, a propylene monomer, and a butene monomer, for example, but the present invention is not limited thereto.

[0024] The modified polyolefin polymer includes a modifying group grafted to the main chain or side chain of the modified polyolefin polymer. In one example, the modifying group is formed from maleic anhydride or a maleic anhydride derivative (a compound containing maleic anhydride in its structure). Thus, the modifying group contains maleic anhydride in its structure. Specifically, the modifying group may be grafted using maleic anhydride, methyltetrahydrophthalic anhydride, 3,4,5,6-tetrahydrophthalic anhydride, 1,2,3,6-tetrahydrophthalic anhydride, methylhexahydrophthalic anhydride, methylnadic anhydride, or 2,3-naphthalic anhydride.

[0025] In the step S150 of laminating the inner layer polymer film, the inner layer polymer film 5 is laminated to the second surface 1b via the polyolefin adhesive 4, thereby forming an aluminum-plastic film 100.

[0026] The inner layer polymer film 5 is a polyolefin polymer film, and the polyolefin polymer film may be, for example, a cast polypropylene (CPP) film. It is worth noting that since the inner layer polymer film 5 is usually not stretched (for example, the cast polypropylene film), the stress in the outer layer polymer film 3 should be stronger than the stress in the inner layer polymer film 5, and if not treated appropriately, the aluminum-plastic film 100 is likely to have problems such as warping or holes.

[0027] Thus, in this embodiment, the thickness of the inner layer polymer film 5 is thicker than the outer layer polymer film 3, and the ratio of the thickness of the inner layer polymer film 5 to the thickness of the outer layer polymer film 3 (inner layer polymer film / outer layer polymer film) is 1.6 to 5.5. Preferably, the ratio of the thickness of the inner layer polymer film 5 to the thickness of the outer layer polymer film 3 may be 1.6 to 2.75, or 2 to 5.5. This makes it possible to achieve a balance between the stress in the inner layer polymer film 5 and the stress in the outer layer polymer film 3, and makes the aluminum-plastic film 100 less susceptible to problems such as warping or hole formation.

[0028] The thickness of the inner layer polymer film 5 may be, for example, 40 μm to 55 μm, and the thickness of the outer layer polymer film 3 may be, for example, 10 μm to 25 μm. Preferably, the thickness of the outer layer polymer film 3 is, for example, 10 μm to 20 μm, which can further reduce stress in the outer layer polymer film 3. Furthermore, after punching to a punching depth of 5 mm, the aluminum-plastic film 100 does not have any noticeable warpage or holes in its appearance.

[0029] [Second embodiment] FIG. 3 is a flowchart of a method for manufacturing an aluminum-plastic film according to a second embodiment of the present invention. As shown in FIG. 3, the second embodiment of the present invention is similar to the first embodiment. However, the differences between the second embodiment and the first embodiment are as follows: In the second embodiment of the present invention, the method for manufacturing an aluminum-plastic film may further include a preheating step S121 in which the outer layer polymer film 3 is preheated at a temperature of 140°C to 180°C for 10 to 30 seconds before performing the outer layer polymer film laminating step S130. Preferably, in the preheating step S121, the outer layer polymer film 3 is preheated at a temperature of approximately 160°C for approximately 20 seconds. The preheating step S121 allows the stress of the outer layer polymer film 3 to be reduced in advance. In this way, there is no need to reduce the thickness of the outer layer polymer film 3. For example, in this embodiment, the thickness of the outer layer polymer film 3 may be 20 μm to 25 μm.

[0030] Furthermore, after the preheating step S121, the shrinkage rate of the outer-layer polymer film 3 in the longitudinal direction is 1% or less, and the shrinkage rate of the outer-layer polymer film 3 in the lateral direction is 1% or less. In other words, if the temperature in the preheating step S121 is too low or the preheating time is too short, the shrinkage rate of the outer-layer polymer film 3 in the longitudinal direction or the lateral direction may be too high (for example, exceeding 1%), which may result in an ineffective reduction of stress in the outer-layer polymer film 3.

[0031] [Third embodiment] Fig. 4 is a flowchart of a method for manufacturing an aluminum-plastic film according to a third embodiment of the present invention. As shown in Fig. 4, the third embodiment of the present invention is similar to the first embodiment, but the difference between the third embodiment and the first embodiment is that in the third embodiment of the present invention, the method for manufacturing an aluminum-plastic film may further include a polyurethane adhesive aging step S131 in which, after performing the step S130 of laminating the outer layer polymer film, the aluminum foil metal film 1 to which the outer layer polymer film 3 has been laminated is left standing in an environment of 45°C to 65°C for 84 hours to 108 hours.

[0032] The standing temperature in the polyurethane adhesive maturation step S131 may be increased gradually. Specifically, the polyurethane adhesive maturation step S131 may be divided into a first polyurethane adhesive standing stage, a second polyurethane adhesive standing stage, and a third polyurethane adhesive standing stage. The standing time in the third polyurethane adhesive standing stage is longer than the standing time in the first polyurethane adhesive standing stage and the standing time in the second polyurethane adhesive standing stage. The standing temperature in the third polyurethane adhesive standing stage is higher than the standing temperature in the second polyurethane adhesive standing stage, and the standing temperature in the second polyurethane adhesive standing stage is higher than the standing temperature in the first polyurethane adhesive standing stage.

[0033] Preferably, the standing temperature of the first polyurethane adhesive during the standing stage is 45°C to 55°C and the standing time is 18 to 30 hours, the standing temperature of the second polyurethane adhesive during the standing stage is 50°C to 60°C and the standing time is 18 to 30 hours, and the standing temperature of the third polyurethane adhesive during the standing stage may be 55°C to 65°C and the standing time is 42 to 54 hours. More preferably, the standing temperature of the first polyurethane adhesive during the standing stage is about 50°C and the standing time is at least 24 hours, the standing temperature of the second polyurethane adhesive during the standing stage is about 55°C and the standing time is about 24 hours, and the standing temperature of the third polyurethane adhesive during the standing stage is about 60°C and the standing time is about 48 hours.

[0034] In addition, the manufacturing method of the aluminum plastic film further includes a polyolefin aging process in which, after performing the step S150 of bonding the inner layer polymer film, the aluminum foil metal film 1 to which the inner layer polymer film 5 is bonded is left standing in an environment of 40°C to 55°C for 84 hours to 108 hours.

[0035] The standing temperature in the polyolefin adhesive maturation step S151 may be increased gradually. Specifically, the polyolefin adhesive maturation step may be divided into a first polyolefin adhesive standing stage and a second polyolefin adhesive standing stage. The standing temperature in the second polyolefin adhesive standing stage is higher than the standing temperature in the first polyolefin adhesive standing stage, and the standing time in the second polyolefin adhesive standing stage is equal to or longer than the standing time in the first polyolefin adhesive standing stage.

[0036] Preferably, the standing temperature of the first polyolefin adhesive during the standing stage is 40°C to 50°C and the standing time is 42 to 54 hours, and the standing temperature of the second polyolefin adhesive during the standing stage is 45°C to 55°C and the standing time is 42 to 54 hours. More preferably, the standing temperature of the first polyolefin adhesive during the standing stage is about 45°C and the standing time is about 48 hours, and the standing temperature of the second polyolefin adhesive during the standing stage is about 50°C and the standing time is about 48 hours.

[0037] It is worth noting that the polyurethane adhesive aging step S131 and the polyolefin adhesive aging step S151 in this embodiment may be combined with the preheating step S121 in the second embodiment, but the present invention is not limited thereto. The present invention also provides an aluminum-plastic film 100. The aluminum-plastic film 100 may be manufactured by the aluminum-plastic film manufacturing method according to any of the above embodiments. [Example]

[0038] [Measurement of experimental data] The present invention will be explained in detail below with reference to Examples 1 to 5 and Comparative Examples 1 and 2. However, these examples are provided for the purpose of understanding the present invention, and the present invention is not limited thereto.

[0039] Example 1: In an aluminum plastic film, the inner layer polymer film was made of polyolefin and had a thickness of 45 μm. The aging conditions for the polyolefin adhesive were to leave the polyolefin adhesive at 45°C for 48 hours, then at 50°C for 48 hours. The aging conditions for the polyurethane adhesive were to leave the polyurethane adhesive at 50°C for 24 hours, then at 55°C for 24 hours, then at 60°C for 48 hours. The outer layer polymer film was not preheated, was composed of nylon, and had a thickness of 20 μm.

[0040] Example 2: In the aluminum plastic film, the inner layer polymer film was made of polyolefin and had a thickness of 50 μm. The aging conditions for the polyolefin adhesive were to leave the polyolefin adhesive at 45°C for 48 hours, then at 50°C for 48 hours. The aging conditions for the polyurethane adhesive were to leave the polyurethane adhesive at 50°C for 24 hours, then at 55°C for 24 hours, then at 60°C for 48 hours. The outer layer polymer film was not preheated, was composed of nylon, and had a thickness of 15 μm.

[0041] Example 3: In an aluminum plastic film, the inner layer polymer film was made of polyolefin and had a thickness of 40 μm. The aging conditions for the polyolefin adhesive were to leave it at 45°C for 48 hours, then at 50°C for 48 hours. The aging conditions for the polyurethane adhesive were to leave it at 50°C for 24 hours, then at 55°C for 24 hours, and then at 60°C for 48 hours. The outer layer polymer film was preheated at 160°C for 20 seconds, and the outer layer polymer film was made of nylon and had a thickness of 25 μm.

[0042] Example 4: In an aluminum plastic film, the inner layer polymer film was made of polyolefin and had a thickness of 50 μm. The aging conditions for the polyolefin adhesive were to leave the polyolefin adhesive at 45°C for 48 hours, then at 50°C for 48 hours. The aging conditions for the polyurethane adhesive were to leave the polyurethane adhesive at 50°C for 24 hours, then at 55°C for 24 hours, then at 60°C for 48 hours. The outer layer polymer film was not preheated, had a composition of Nylon / PET, and had a thickness of 15 μm.

[0043] Example 5: In an aluminum plastic film, the inner layer polymer film was made of polyolefin and had a thickness of 40 μm. The aging conditions for the polyolefin adhesive were to leave it at 45°C for 48 hours, then at 50°C for 48 hours. The aging conditions for the polyurethane adhesive were to leave it at 50°C for 24 hours, then at 55°C for 24 hours, then at 60°C for 48 hours. The outer layer polymer film was preheated at 160°C for 20 seconds, and the outer layer polymer film was made of nylon and had a thickness of 25 μm.

[0044] Comparative Example 1: In an aluminum plastic film, the component of the inner layer polymer film was polyolefin, the thickness of the inner layer polymer film was 40 μm, and the aging conditions for the polyolefin adhesive were that the polyolefin adhesive was left standing at a temperature of 60°C for 96 hours. The aging conditions for the polyurethane adhesive were that the polyurethane adhesive was left standing at 60°C for 96 hours. The outer layer polymer film was not preheated, the composition of the outer layer polymer film was nylon, and the thickness of the outer layer polymer film was 25 μm.

[0045] Comparative Example 2: In the aluminum plastic film, the component of the inner layer polymer film was polyolefin, the thickness of the inner layer polymer film was 50 μm, and the aging conditions for the polyolefin adhesive were that the polyolefin adhesive was left standing at a temperature of 60°C for 96 hours. The aging conditions for the polyurethane adhesive were that the polyurethane adhesive was left standing at 60°C for 96 hours. The outer layer polymer film was not preheated, the composition of the outer layer polymer film was nylon, and the thickness of the outer layer polymer film was 15 μm.

[0046] The parameters and appearance measurement results in the manufacturing methods of the aluminum plastic films according to Examples 1 to 5 and Comparative Examples 1 and 2 are as shown in the following Table 1. The measurement methods will be described later.

[0047] Appearance measurement: After punching a 5mm deep hole into an aluminum-plastic film using a 98mm long, 57mm wide die, the appearance of the aluminum-plastic film was observed. O indicated that the appearance after punching was smooth, without warping, and without holes. △ indicated that the appearance after punching was essentially smooth, with slight warping (i.e., a warp angle of 30° or less), and without holes. X indicated that the appearance after punching was significantly warped (i.e., a warp angle of more than 30°), or smooth but with holes.

[0048] [Table 1-1] [Table 1-2]

[0049] [Consideration of measurement results] In Comparative Example 1, the thickness of the outer polymer film was too high, so the stress in the outer polymer film was too high and the aluminum-plastic film punched to a depth of 5.0 mm had a noticeable warp. From Example 2 and Comparative Example 2, it was found that the polyurethane adhesive and the standing temperature of the polyurethane adhesive in Comparative Example 2 did not increase gradually, and the aluminum-plastic film punched to a depth of 5.0 mm had holes in its appearance.

[0050] [Advantageous Effects of the Embodiments] An advantageous effect of the present invention is that the aluminum-plastic film and its manufacturing method of the present invention have the technical feature that "the ratio of the thickness of the inner layer polymer film to the thickness of the outer layer polymer film is 1.6 to 5.5," thereby improving the problem of significant warping or holes occurring when conventional aluminum-plastic films are applied to battery products with a high punching depth.

[0051] The above disclosure is merely a preferred embodiment of the present invention, and the scope of the claims of the present invention is not limited thereto. Therefore, all equivalent technical modifications made using the specification and drawings of the present invention are included in the scope of the claims of the present invention. [Explanation of symbols]

[0052] 100...Aluminum plastic film 1. Aluminum foil metal film 1a...first surface 1b...Second surface 2. Polyurethane adhesive 3...Outer polymer membrane 4...Polyolefin adhesive 5...Inner layer polymer membrane S110...preparation process S120...Polyurethane adhesive application process S121...Preheating process S130...Process of attaching the outer polymer film S131...Aging process of polyurethane adhesives S140...Polyolefin adhesive application process S150...The process of bonding the inner polymer film S151...Aging process of polyolefin adhesives

Claims

1. providing an aluminum foil metal film having a first surface and a second surface; a polyurethane adhesive application step of applying a polyurethane adhesive to the first surface of the aluminum foil metal film; an outer layer polymer film bonding step of bonding an outer layer polymer film, which is at least one of a nylon polymer film, a polyester polymer film, and a nylon / polyester polymer multilayer film, to the first surface via the polyurethane adhesive; a polyolefin adhesive application step of applying a polyolefin adhesive to the second surface of the aluminum foil metal film; and a step of laminating an inner layer polymer film, which is a polyolefin polymer film, to the second surface via the polyolefin adhesive to form an aluminum-plastic film, A method for producing an aluminum-plastic film, characterized in that the ratio of the thickness of the inner layer polymer film to the thickness of the outer layer polymer film (thickness of the inner layer polymer film / thickness of the outer layer polymer film) is 1.6 to 5.

5.

2. The method for producing an aluminum plastic film described in claim 1 further includes a preheating process of preheating the outer layer polymer film at a temperature of 140°C to 180°C for 10 to 30 seconds before performing the process of bonding the outer layer polymer film, and the thickness of the outer layer polymer film is 20 μm to 25 μm.

3. A method for manufacturing an aluminum plastic film as described in claim 2, wherein after the preheating process, the longitudinal shrinkage rate of the outer layer polymer film is 1% or less, and the lateral shrinkage rate of the outer layer polymer film is 1% or less.

4. The method for producing an aluminum-plastic film according to claim 1, wherein the thickness of the outer polymer film is 10 μm to 20 μm.

5. The method for producing an aluminum-plastic film described in claim 1 further includes a polyurethane adhesive aging process in which the aluminum foil metal film to which the outer layer polymer film has been attached is left standing in an environment of 45°C to 65°C for 84 hours to 108 hours after the process of attaching the outer layer polymer film.

6. A method for producing an aluminum-plastic film as described in claim 5, wherein the polyurethane adhesive maturation process is divided into a first polyurethane adhesive resting stage, a second polyurethane adhesive resting stage, and a third polyurethane adhesive resting stage, the resting time in the third polyurethane adhesive resting stage is longer than the resting time in the first polyurethane adhesive resting stage and the resting time in the second polyurethane adhesive resting stage, the resting temperature in the third polyurethane adhesive resting stage is higher than the resting temperature in the second polyurethane adhesive resting stage, and the resting temperature in the second polyurethane adhesive resting stage is higher than the resting temperature in the first polyurethane adhesive resting stage.

7. The method for producing an aluminum-plastic film according to claim 1, further comprising a polyolefin adhesive aging process in which the aluminum foil metal film to which the inner layer polymer film has been attached is left standing in an environment of 40°C to 55°C for 84 to 108 hours after the process of attaching the inner layer polymer film.

8. A method for producing an aluminum-plastic film as described in claim 7, wherein the polyolefin adhesive maturation process is divided into a first polyolefin adhesive standing stage and a second polyolefin adhesive standing stage, the standing temperature in the second polyolefin adhesive standing stage is higher than the standing temperature in the first polyolefin adhesive standing stage, and the standing time in the second polyolefin adhesive standing stage is equal to or longer than the standing time in the first polyolefin adhesive standing stage.

9. The method for producing an aluminum-plastic film according to claim 1, wherein after punching to a punching depth of 5 mm, the appearance of the aluminum-plastic film does not have any significant warping or holes.

10. An aluminum-plastic film, characterized in that it is manufactured by the aluminum-plastic film manufacturing method described in claim 1.

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