JP2000309055A - Production of thermoplastic resin film-coated aluminum panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently ensure the adhesion and processability of a film without bringing about the lowering of the strength of an Al panel at the time of lamination even if a thermoplastic resin with a relatively high m.p. such as polyester or the like is used as a film in producing a thermoplastic resin film coated Al panel by laminating a thermoplastic resin film to an Al panel. SOLUTION: A thermoplastic resin film coated Al panel 1 is produced by a first process heating an Al panel to temp. higher than the glass transition temp. of a resin film but below the m.p. (Tm) thereof, laminating the resin film to at least one surface of the Al panel at that temp. and pressurizing them by laminating rolls 7A, 7B and a second process heating the resin film laminated Al panel by an infrared heating system 11 bringing the temp. of the resin film to a temp. range from (Tm-50) deg.C to (Tm+20) deg.C in succession to the first process.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a resin film-coated aluminum plate obtained by laminating a thermoplastic resin film on one or both surfaces of an aluminum plate. The present invention relates to a method for producing a thermoplastic resin-coated aluminum plate laminated with a thermoplastic resin film having a relatively high melting point of higher than ° C.

[0002]

2. Description of the Related Art Conventionally, a resin film-coated metal plate obtained by laminating a resin film on one or both surfaces of a metal plate has been widely used in various fields such as electric parts, furniture, and interior and exterior building materials. In recent years, beverage cans and other products have been developed for the purpose of environmental protection by reducing the emission of VOC and CO ₂ , and for the purpose of improving the stability and quality of contents by using the high barrier properties of polyester films. Polyester film-coated metal sheets are frequently used as container materials.

As a method of continuously laminating a thermoplastic resin film on a metal plate using a thermoplastic resin such as polyester as a resin film, for example, as disclosed in Japanese Patent Publication No. 2-58094, The plate is heated to a temperature equal to or higher than the melting point of the thermoplastic resin film, and in that state, the thermoplastic resin film is laminated on one or both surfaces of the metal plate, heated and pressed by a temperature-controlled laminating roll, and then immediately cooled, Alternatively, there is known a method of performing a heat treatment as a post-treatment and then cooling.

On the other hand, as a resin film to be laminated on a metal plate, a film having a single-layer structure made of a single resin is used, or a resin film having a different melting point as shown in Japanese Patent Application Laid-Open No. 2-501640. 2 using more than one kind of resin
In some cases, a film having a plurality of layers or more is used, and an adhesive layer may be interposed between the metal plate and the resin film. In addition, as such a resin film, generally, a biaxially stretched film is often used.

[0005] The heating temperature of the metal plate when laminating the resin film on the metal plate varies depending on the purpose of use of the metal plate coated with the resin film. However, in order to ensure high adhesion between the resin film and the metal plate. Often, the metal plate is heated to a high temperature higher than the melting point of the resin film. Generally, as a heating method, various methods such as a hot air heat transfer method, an electric heating method, an induction heating method, a heat roll heat transfer method, and an infrared heating method are known, but immediately before laminating a resin film to a metal plate. In order to heat a metal plate, a heat roll heat transfer method is often used, and an induction heating method is often used for heat treatment after lamination.

[0006]

In laminating a thermoplastic resin film on a metal plate, it is necessary to heat at least a temperature higher than the glass transition temperature of the thermoplastic resin in order to ensure high adhesion. Depending on the case, it may be necessary to heat to a temperature higher than the melting point of the thermoplastic resin. However, in such a case, the strength of the metal plate may be reduced by heating. In particular, when a resin having a melting point of more than 200 ° C., such as polyester, polyamide, or a fluorine-based resin, is used as the thermoplastic resin and an aluminum plate is used as the metal plate, there is a strong concern.

On the other hand, recently, as described above, a resin film-coated metal plate is often used for a beverage can. In that case, polyester is often used as the resin film, and an aluminum plate is often used as the metal plate. For such aluminum beverage cans, it is strongly desired to reduce the weight by thinning the wall. Therefore, in order to ensure sufficient pressure resistance even with a thin wall, it is desired to use a material having a high strength.
As described above, if a resin film is laminated at a high temperature in order to secure the adhesion of a resin film such as polyester, the demand for thinning may not be sufficiently satisfied due to a decrease in the strength of the aluminum plate.

The present invention has been made in view of the above circumstances. Even when a thermoplastic resin having a relatively high melting point exceeding 200 ° C., such as polyester, is used, aluminum is not used when laminating a thermoplastic resin film. It is an object of the present invention to provide a method for manufacturing a resin film-coated aluminum plate that can sufficiently secure the adhesion of a resin film without causing a decrease in the strength of the plate.

[0009]

Means for Solving the Problems In order to solve the above-mentioned problems, the present inventors have conducted intensive experiments and studies, and as a result,
After heating the aluminum plate to the appropriate temperature range and laminating the thermoplastic resin film on the aluminum plate, applying pressure by a laminating roll and temporarily bonding, applying an infrared heating method especially as a heating means for the resin film, properly By heating the resin film to the adjusted temperature range,
The present inventors have found that the adhesiveness of the laminate resin can be ensured without lowering the strength of the aluminum plate, and that the workability is also improved, leading to the present invention.

More specifically, the invention of claim 1 is a method of manufacturing a thermoplastic resin film-coated aluminum plate by laminating a thermoplastic resin film on an aluminum plate. Heating to a temperature within the range of not less than the temperature and less than the melting point (Tm), laminating a thermoplastic resin film on at least one surface of the aluminum plate at a temperature within the range, pressing with a laminating roll, and temporarily bonding One step and subsequent to the first step, the temperature of the resin film is set to (Tm-5)
0) a temperature of not less than 0 ° C. and not more than (Tm + 20) ° C. in a second step of heating by an infrared heating method.

According to a second aspect of the present invention, there is provided a method for producing a thermoplastic resin film-coated aluminum plate by laminating a resin film having a multilayer structure composed of two or more thermoplastic resins on an aluminum plate. Heat to a temperature in the range of not less than the glass transition temperature of the resin of the layer in contact with the aluminum plate in the thermoplastic resin film and less than the melting point of the resin of the outermost layer in the resin film, and at least one of the aluminum plates at a temperature within the range. A first step of laminating a resin film on the surface and pressing with a laminating roll and temporarily bonding, and following the first step,
In accordance with the melting point (Tm1) of the resin having the highest melting point among the resins of each layer constituting the resin film, the temperature of the resin film is set to be in the range of (Tm1-50) ° C or more and (Tm1 + 20) ° C or less. And a second step of heating by an infrared heating method.

According to a third aspect of the present invention, in the method for producing an aluminum plate coated with a thermoplastic resin film according to the second aspect, the resin film having the multilayer structure has a melting point of the outermost resin in contact with the aluminum plate. A temperature higher than the melting point of the resin of the layer in contact with the aluminum plate in the resin film and lower than the melting point of the resin of the outermost layer. It is characterized by the following.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The upper part (A) of FIG. 1 shows a conceptual structure of an apparatus for carrying out the method of the present invention by a continuous laminating method, and the lower part (B) of FIG. FIG. 1A shows changes in the temperature of the aluminum plate and the temperature of the thermoplastic resin when the thermoplastic resin is continuously laminated. FIG. 1
Shows an example in which a resin film is laminated on both sides of an aluminum plate. Further, in the following description, first, the overall configuration of the invention will be described in the case of laminating using a resin film having a single-layer configuration, and then, the case of using a resin film having a plurality of layers will be described.

In FIG. 1 (A), the aluminum plate 1 is, for example, previously formed as a coil, and the coiled aluminum plate 1 is continuously fed from the supply side reel 3 while passing through the first heating means 5. The glass transition temperature (Tg) of the resin of the thermoplastic resin film to be laminated,
It is heated to a temperature T1 within a range below the melting point (Tm). Subsequently, the aluminum plate 1 reaches between a pair of upper and lower laminate rolls (pressure rolls) 7A and 7B. At a position immediately before the laminating rolls 7A and 7B, the thermoplastic resin films 9A and 9B to be laminated are continuously supplied to one side or both sides (both sides in the illustrated example) of the aluminum plate 1, and are laminated by the laminating rolls 7A and 7B. It is pressed and bonded to the surface of the aluminum plate 1 in a temporary bonding state. The steps so far correspond to the first step in the method of the present invention. The aluminum plate 1 passes through the second heating means 11 while the thermoplastic resin is temporarily bonded as described above, during which the thermoplastic resin films 9A and 9B
m−50) ° C. or higher and lower than (Tm + 20) ° C.
Heated to 2. This step corresponds to the second step in the method of the present invention. Here, as the second heating means 11, a heating means of an infrared heating method is particularly applied in the case of the present invention. Then, after the resin film is heated by the second heating means of the infrared heating system and laminated on the aluminum plate, the laminated aluminum plate 1 is cooled appropriately, and then continuously wound on the take-up reel 13.

In the first step, the first step is to heat the aluminum plate, laminate the thermoplastic resin film on one or both sides thereof, and press the laminate roll to temporarily adhere the thermoplastic resin film to the surface of the aluminum plate. In the first step, the purpose of heating the aluminum plate in the first step is to soften the thermoplastic film in contact with the aluminum plate and temporarily bond the film to the aluminum plate by pressing with a laminating roll. If the heating temperature in the first step is lower than the glass transition temperature of the resin, the softening of the resin film becomes insufficient, and the resin film may not be sufficiently adhered to the surface of the aluminum plate due to the entrainment of air or the like. On the other hand, the higher the heating temperature, the higher the adhesion can be obtained. However, if the heating temperature is higher than the melting point of the resin, the resin film is melted and adheres to the laminating roll, which causes a problem that the lamination cannot be performed smoothly. Therefore, the heating temperature of the aluminum plate in the first step needs to be in a temperature range not lower than the glass transition temperature of the resin constituting the resin film to be used and lower than the melting point.

The first heating means for heating the aluminum plate in the first step is not particularly limited, but may be a roll heating method, a hot air heating method, an infrared heating method, or the like.
Any method such as an electric heating method and an induction heating method may be applied. However, among these, the roll heating method is the most suitable in terms of making the temperature distribution uniform and efficient.

The surface temperature of the roll when pressed by the laminating roll is not particularly limited, but is generally set to be slightly lower than the temperature of the aluminum plate. The pressure applied by the laminating roll is not particularly limited, but generally, a linear pressure of 2 kgf / cm or more is appropriate. The pressing force of the laminating roll is 2kgf /
If it is less than cm, sufficient adhesion may not be obtained. The upper limit of the pressing force is not particularly limited, but may be a common sense pressure that does not damage the device.

Next, in the second step, the thermoplastic resin film temporarily bonded to the surface of the aluminum plate as described above is heated from (Tm-50) ° C. to (Tm + 2) with respect to its melting point (Tm).
0) Heating to a temperature within the range of ° C. by an infrared heating method. The first purpose of the heating in the second step is to bond the resin film to the surface of the aluminum plate with sufficient adhesion. That is, by further softening and melting the resin film temporarily bonded in the first step, air entrapped between the aluminum plate and the film is removed by permeating through the film, and a roll on the surface of the aluminum plate is removed. The purpose is to allow the resin of the film to penetrate into minute recesses such as oil pits and oil pits so that the film is firmly adhered to the aluminum plate.

The second purpose of the heating in the second step is to disrupt the orientation of the oriented and crystallized resin film and to impart good workability to the film. In other words, in general, a film oriented and crystallized by biaxial stretching is often used as a resin film for lamination, and since the oriented crystallized state does not have sufficient workability,
When the finally obtained resin film-coated aluminum plate is pressed, the resin film may be cracked or broken, which may make processing difficult.
Therefore, in order to impart sufficient workability, it is necessary to collapse the orientation by heating.

The heating temperature of the resin film in the second step for these purposes is (Tm-50) ° C. or more,
(m + 20) ° C. or lower. That is, the heating temperature of the resin film in the second step is (Tm-50)
If the temperature is lower than ℃, the softening and melting of the resin film does not proceed sufficiently, so that a high adhesion force cannot be obtained.Therefore, the resin film may be peeled off during processing or the like, and the collapse of the orientation of the resin film is not sufficient. Inferior in processability, the resin film may be cracked or broken at the time of processing, and processing may be difficult. Therefore, the lower limit of the heating temperature of the resin film in the second step is (Tm-50) ) ° C. The heating temperature is (Tm + 2
0) If the temperature is higher than 0 ° C., a part of the molecular structure constituting the resin film may be cut off. In such a case, the film surface may be roughened or cracked during processing. When heating such as retort treatment is performed, peeling or whitening of the resin film may occur. Therefore, the upper limit of the heating temperature of the resin film in the second step is reduced. Was (Tm + 20) ° C.

Here, it is necessary to use an infrared heating method as the heating method in the second step, which is an important point in the present invention.

That is, since the heating temperature in the second step is generally set higher than the heating temperature in the first step, the strength of the coated aluminum plate is determined by the heating temperature in the second step. Usually it is. On the other hand, the aluminum plate has a remarkably low softening temperature as compared with a steel plate or the like, so that the heating in the second step may significantly lower the strength. As described above, this reduction in strength causes a particular inconvenience when the coated plate is applied to an application requiring high pressure resistance, such as a beverage can.
Therefore, the heating temperature of the second step is desirably as low as possible, but if the heating temperature of the second step is low, the resin film cannot be sufficiently softened and melted as described above,
In addition, it becomes difficult to collapse the orientation of the resin film, and as a result, it becomes difficult to obtain sufficient adhesion and good workability. As described above, prevention of a decrease in the strength of the aluminum plate and securing of sufficient adhesion and workability of the resin film are mutually contradictory in relation to the heating temperature in the second step. The inventors of the present invention have conducted intensive experiments and researches to overcome such conflicting objectives, and have found that it is most appropriate to apply an infrared heating method as a heating method in the second step. .

Conventionally, induction heating is generally used as the heating method in the second step. However, when the induction heating method is applied, the aluminum plate itself generates heat due to the induction current flowing through the aluminum plate. Then, the heat is conducted to the resin film, and the temperature of the resin film reaches the softening melting temperature. Therefore, since the temperature of the aluminum plate is also raised to the softening temperature of the resin film or a higher temperature, when the softening and melting temperature of the resin film is high, the temperature of the aluminum plate also needs to be significantly increased. As a result, the aluminum plate may be significantly softened.

On the other hand, in the infrared heating system applied to the second step in the present invention, the energy radiated from the infrared irradiation heater is directly absorbed by the resin film covering the surface of the aluminum plate, The temperature of the resin film rises, while the aluminum plate is not directly irradiated with infrared rays, so that the temperature rise is delayed. Here, in the case of infrared rays having a relatively long wavelength, the infrared rays may pass through the resin film and reach the aluminum plate surface, but even if the infrared rays reach the aluminum plate surface, the reflectance of the aluminum plate surface is low. Since the infrared rays are so high that the infrared rays are hardly absorbed, the infrared rays reaching the aluminum plate surface hardly contribute to the temperature rise of the aluminum plate. In addition, since the resin film generally has a low thermal conductivity, the heat conduction in the resin film is slow, and therefore, the temperature of the aluminum plate does not rapidly rise simultaneously with the temperature rise of the resin film due to the heat conduction. Therefore, these effects act synergistically, and according to the infrared heating method, as shown in FIG. 1B, the ultimate temperature of the aluminum plate present below the resin film is lower than the ultimate temperature of the resin film. Temperature remains low, and as a result, a decrease in strength due to softening of the aluminum plate can be suppressed.

The infrared heating method is also advantageous in that the resin film can be heated quickly and efficiently. In other words, infrared rays are a type of electromagnetic wave, and when the wavelength of the electromagnetic wave matches the absorption wavelength range of the object to be heated, energy is efficiently absorbed, molecular vibration becomes active, and the temperature rises rapidly. However, the wavelength of infrared rays is generally about 0.75 μm to 1000 μm, while most of resins generally used as resin films for coating have an absorption wavelength range of about 2 μm to 30 μm. By using a heater having a high infrared emissivity in the absorption wavelength region of the coating resin, the resin film can be efficiently and rapidly heated.

Here, as the heating method in the second step, a hot air heating method may be applied. However, the hot air heating method is preferable because rapid heating is difficult and a long furnace length is required. Not a method. Also the second
In the heating in the process, it is necessary to soften and melt the resin film. Therefore, in the contact-type heat roll heating method, there is an inconvenience that the molten resin adheres to the roll. Therefore, from these viewpoints, the infrared heating method is most suitable as the heating method in the second step.

The cooling after heating in the second step is not particularly limited, but in the case of slow cooling, unnecessary crystallization may be caused depending on the type of the film resin used.
Therefore, rapid cooling is generally preferred.

Next, when the thermoplastic resin film to be laminated on one or both sides of the aluminum plate has a multi-layer structure composed of two or more kinds of thermoplastic resins, that is, claims 2 and 3. The case of the method of the present invention will be described.

When a resin film having a plurality of layers is used, the basic process and its operation are the same as those when the resin film having a single layer is used.
The heating temperature of the aluminum plate in the step and the heating temperature of the resin film in the second step need to be determined according to the resin of each layer constituting the resin film. That is, in the case of a resin film having a multilayer structure of two or more layers, at least a layer in contact with the aluminum plate is a layer to be finally bonded to the aluminum plate (hereinafter referred to as an adhesive layer).
And a layer exposed on the outer surface side in the final cover plate (hereinafter referred to as an outermost layer). In the case of three or more layers, one or more intermediate layers are provided between the adhesive layer and the outermost layer. The heating temperature of the aluminum plate in the first step is determined according to the glass transition temperature of the resin in the adhesive layer and the melting point of the resin in the outermost layer, while the heating temperature of the resin film in the second step is Needs to be determined according to the melting point of the resin having the highest melting point.

Specifically, first, the heating temperature of the aluminum plate in the first step is a temperature not lower than the glass transition temperature of the resin constituting the adhesive layer and less than the melting point of the resin constituting the outermost layer. It is necessary to That is, if the heating temperature in the first step is lower than the glass transition temperature of the resin of the adhesive layer, the softening of the resin of the adhesive layer becomes insufficient, and the resin film sufficiently covers the aluminum plate surface due to air entrainment or the like. There is a risk of not being adhered. On the other hand, if the heating temperature in the first step is equal to or higher than the melting point of the resin of the outermost layer, the resin of the outermost layer is melted and adheres to the laminating roll, and there is a possibility that the lamination cannot be performed smoothly.

In the first step in the case where the resin film having a plurality of layers is used, in order to increase the adhesion of the resin film to the aluminum plate as much as possible, the temperature of the adhesive layer reaches the melting point, and Is desirably pressed by a laminating roll in a state where the resin is completely melted. However, if the melting point of the resin of the outermost layer is equal to or lower than the melting point of the resin of the adhesive layer, the resin of the outermost layer is in a molten state while the resin of the adhesive layer is in a molten state. Disadvantageously adheres to the laminating roll. Therefore, it is desirable to select the resin of the outermost layer whose melting point is lower than the melting point of the resin of the adhesive layer. In the heating in the first step, as described above, the adhesive layer is completely melted to increase the adhesion, and the melting point of the resin of the outermost layer is higher than the melting point of the resin of the outermost layer so as not to melt the resin of the outermost layer. It is desirable to heat at a lower temperature.

When a resin film having a plurality of layers is used, the heating temperature in the second step can be set as follows: Tm1 is the melting point of the resin having the highest melting point among the resins of the plurality of layers constituting the resin film. , (Tm1-50) ° C or higher, (Tm
(m1 + 20) ° C. or less. That is, the purpose of heating the resin film in the second step is not only to bond the resin film to the surface of the aluminum plate with a sufficient adhesive force as described above, but also to disintegrate the orientation of the crystallized resin film and obtain a favorable film. It is also important to provide good workability, and among the layers of the resin film having a multi-layer structure, the adhesion of the adhesive layer has progressed to some extent due to the heating in the first step, but has a melting point higher than that of the adhesive layer. Since the collapse of the orientation in the high layer is still insufficient, it is necessary to impart good processability by collapsing the orientation of these layers in the heating in the second step. Therefore, the heating temperature in the second step in the case of using a resin film having a plurality of layers is determined to be in the range of (Tm1-50) ° C or more and (Tm1 + 20) ° C based on the melting point Tm1 of the layer having the highest melting point. It was.

The configuration of the present invention other than the above-mentioned heating temperature conditions in the case of using a resin film having a plurality of layers is the same as the case of using the resin film having a single layer described above, and the description thereof will be omitted. .

[0034]

EXAMPLE 1 An aluminum plate made of JIS A5182 alloy having a thickness of 0.28 mm and obtained by performing casting, hot rolling and cold rolling by a conventional method, phosphoric acid of 20 mg / m ² was used as a base treatment. Chromate treatment was performed to obtain a base treated plate. The resin for the adhesive layer has a melting point of 215 ° C. and a glass transition temperature of 7
2 ° C polyester, melting point 2 as outermost layer resin
60 ° C., using polyester having a glass transition temperature of 75 ° C., the thickness of the adhesive layer is 5 μm, the thickness of the outermost layer is 15 μm,
A polyester film having a two-layer structure with a total total thickness of 20 μm was laminated on both surfaces of the base treatment plate under the conditions shown in Table 1. In the present invention, an infrared irradiation heater was used as a heating means in the second step, and induction heating was used as a comparative example. Here, as the infrared irradiation heater of the example of the present invention, a heater having a high infrared emissivity in a wavelength range of 2.5 to 25 μm was used. The results of examining the strength (strength after lamination) of the finally obtained coated plate are also shown in Table 1.

[0035]

[Table 1]

As shown in Table 1, the comparative examples (production numbers 4 to
6) is a method in which the heating temperature in each step is set to be the same as that of the invention example (manufacturing number 1 to 3), but an induction heating method is applied instead of an infrared irradiation heater as a heating means in the second step. is there. In each of the present invention examples, it was found that the strength after final lamination was remarkably improved as compared with each of the comparative examples having the same heating temperature. When a beverage can was molded using the coated plate obtained according to the present invention, it was confirmed that the adhesiveness of the resin film was good and the workability was also good.

Example 2 Lamination was carried out on the same substrate-treated plate as in Example 1 by using the same two-layer polyester film as in Example 1 and changing only the heating conditions. Table 2 shows specific heating conditions in each step. The strength after lamination was measured, and the results are also shown in Table 2.

[0038]

[Table 2]

As shown in Table 2, the production number 7 is the same as that of the first embodiment.
This is a comparative example in which the heating temperature in the first step is lowered to 50 ° C. as compared with the inventive example of the production number 2 of the present invention. In this case, the strength after lamination is the same as the inventive example of the production number 2 ,
Since the heating temperature in the first step was low, the adhesion strength of the film was low, and peeling of the film occurred at the end of the lid during lid molding. Also, in the production number 8, the heating temperature in the second step is 290 ° C., as compared with the inventive example of the production number 3 in Example 1.
In this case, although the heating temperature in the second step was high, the heating method was an infrared heating method, so that the strength after lamination could secure 300 N / mm ² or more. However, as a result, the surface of the film became rough, and the commercial value was spoiled. Further serial number 9
Is a comparative example in which the heating temperature in the second step is too low. In this case, the adhesion of the film and the formability are inferior. Cracks occurred.

Example 3 An aluminum plate was changed to a 3004 alloy plate, and a resin film having a glass transition temperature of 72 ° C. and a melting point of 250 was used.
Lamination was carried out in the same manner as in Example 1 except that a single-layer polyester film at ℃ was used. Table 3 shows specific heating conditions in each step, and Table 3 also shows the results of examining the strength after lamination.

[0041]

[Table 3]

In Table 3, the production numbers 14 to 16 are the same as the production numbers 11 to 13 of the present invention, and the heating temperature in each step is set to the same temperature. This is an application of the induction heating method. When each invention example is compared with the corresponding comparative example,
In any case, it is clear that the present invention has a much higher strength after lamination. When a beverage can was molded using the coated plate obtained according to the present invention,
It was confirmed that the film had good adhesion and workability.

[0043]

According to the method of the present invention, an infrared heating method is applied as the heating means in the second step, and the heating temperature in the first step and the heating temperature in the second step are set to the melting point and the glass transition temperature of the laminated resin. Therefore, high adhesion and processability of the resin film can be obtained while keeping the ultimate temperature of the aluminum plate low and securing a sufficiently high strength after lamination. Therefore, according to the method of the present invention, it is possible to reliably and stably obtain a coated aluminum plate having high strength, good adhesion of the resin film and excellent workability. In particular, in applications such as beverage cans that require pressure resistance, 200
Even when a resin film having a relatively high melting point exceeding ℃ is used, sufficient high strength, film adhesion and processability can be obtained, and therefore, it is possible to sufficiently cope with thinning of beverage cans and the like.

[Brief description of the drawings]

FIG. 1A is a schematic diagram showing an example of a conceptual configuration of a situation in which the method of the present invention is performed, and FIG. 1B is a schematic diagram showing each step corresponding to the configuration of FIG. FIG. 4 is a diagram showing temperature transitions of an aluminum plate and a resin film in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Aluminum plate 5 1st heating means 7A, 7B Laminate roll 9A, 9B Thermoplastic resin film 11 2nd heating means (infrared heating method)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme court ゛ (Reference) // B65D 8/04 B65D 8/04 GB29K 67:00 B29L 9:00 (72) Inventor Rikizo Baba 1-2-1 Kinshi, Sumida-ku, Tokyo Sky Aluminum Co., Ltd. (72) Inventor Toshio Nishiide 3-6-5 Iidabashi, Chiyoda-ku, Tokyo F-term in Showa Aluminum Can Co., Ltd. 3E061 AA16 AB08 AB13 4F100 AB10A AK01B AK01C AK42B AK42C BA02 BA03 BA07 BA10A BA10C BA16 EA021 EJ192 EJ421 EJ432 GB16 GB23 JB16B JB16C JK01 JL11 4F211 AA24 AD03 AD08 AG01 AG03 AK04 TA13 TC05 TH03 TH06 T06 T13

Claims (3)

[Claims] 1. A method for producing a thermoplastic resin film-coated aluminum plate by laminating a thermoplastic resin film on an aluminum plate; wherein the aluminum plate has a temperature higher than the glass transition temperature of the thermoplastic resin film and a melting point (T
m) a step of heating to a temperature within the range of less than m), laminating a thermoplastic resin film on at least one surface of the aluminum plate at a temperature within the range, pressing with a laminating roll, and temporarily adhering; After one step, the temperature of the resin film is (Tm
A second step of heating by an infrared heating method so as to be in a range of −50) ° C. or more and (Tm + 20) ° C. or less,
A method for producing a thermoplastic resin film-coated aluminum plate, comprising: 2. A method for producing a thermoplastic resin film-coated aluminum plate by laminating a resin film having a multilayer structure composed of two or more thermoplastic resins on an aluminum plate; Heat to a temperature within the range of the glass transition temperature of the resin of the layer in contact with the plate and below the melting point of the resin of the outermost layer in the resin film, and laminate the resin film on at least one surface of the aluminum plate at a temperature within that range A first step of pressurizing with a laminating roll and temporarily adhering; and subsequent to the first step, a resin is formed according to the melting point (Tm1) of the resin having the highest melting point among the resins of each layer constituting the resin film. Infrared heating system so that the temperature of the film is in the range of (Tm1-50) ° C or more and (Tm1 + 20) ° C or less The second step, characterized by comprising the capital method for producing a thermoplastic resin film coated aluminum plate to further heating. 3. The method for producing an aluminum plate coated with a thermoplastic resin film according to claim 2, wherein the resin film of the multilayer structure has a melting point of a resin of an outermost layer lower than a melting point of a resin of a layer in contact with the aluminum plate. A high temperature, wherein the heating temperature of the aluminum plate in the first step is set to a temperature within a range not lower than the melting point of the resin of the layer in contact with the aluminum plate in the resin film and lower than the melting point of the resin of the outermost layer. A method for producing an aluminum plate coated with a thermoplastic resin film.