JP2011189526A - Aluminum material with multilayered film for press work and press work method for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aluminum material with a multilayered film for press work and a press work method for the same suppressing break and peeling of the film during press work and allowing visual recognition of the break and peeling if they occur. <P>SOLUTION: In the aluminum material 1 with the multilayered film 3 for press work and the press work method for the same, the multilayered film 3 formed by laminating a resin film layer 31, a printing layer 32 and an adhesive layer 33 is stuck to the surface of the aluminum material 2 on the adhesive layer 33. The resin film layer 31 comprises a resin film mainly composed of polypropylene resin. The printing layer 32 is formed by applying printing ink on a resin film, and the adhesive layer 33 comprises an adhesive. In the press work, the multilayered film 3 side of the aluminum material 1 including the multilayered film 3 for press work is arranged in a press working machine to face the die side, and the aluminum material 1 including the multilayered film 3 for press work is protruded to the die side. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an aluminum material with a multilayer film for press working in which a multilayer film that effectively plays a role of surface protection not only at the time of handling but also at the time of press work is attached to an aluminum material, and a press working method thereof.

An aluminum material is easily scratched during handling due to its softness and thinness of a natural oxide film in a solid state where the surface is not subjected to a special surface treatment such as anodization.
Usually, an aluminum material is conveyed from a manufacturing factory to a molding factory or the like in a state where a coil-up or a cut plate is laminated and packaged as a whole. Since the surface of the material is hidden in the coil or in the laminated state in the coil-up and laminated state, the aluminum material will not be damaged in the manufacturing plant unless there is a gap between the materials due to considerable vibration. However, it may be damaged during handling and processing in a molding factory after transportation.

  Therefore, if scratching becomes a problem, surface protection is required when using the product in a molding factory or the like by coiling up or laminating cut sheets with a protective film applied to the material surface in an aluminum material manufacturing factory. It is usual to peel off the film. As a film for that purpose, a film made of a synthetic resin is preferably used.

In addition, a volatile lubricating oil with the film attached to the surface protective film made of synthetic resin is used for its extensibility (hardness to tear), surface lubricity (slipperiness), and adhesiveness (hardness to peel). It is also possible to perform press working using and to peel off the protective film after working.
Conventionally, vinyl chloride has been frequently used for such protective films. However, since vinyl chloride generates dioxins at the time of disposal after combustion, it has been found that it adversely affects the human body or the global ozone layer, and vinyl chloride can no longer be used.

Therefore, polyethylene has come to be used as a synthetic resin to replace vinyl chloride. Specifically, for example, as shown in Patent Document 1 described later, a surface protective film mainly composed of a polyethylene component has been developed.
In addition, polypropylene having excellent extensibility, surface lubricity, adhesiveness, and heat resistance than polyethylene has also been used. Specifically, for example, as shown in Patent Document 2 described later, a surface protective film mainly composed of a polypropylene component has been developed.

JP 2006-116769 A JP 2008-81709 A

  However, the above-mentioned surface protective film mainly composed of the polyethylene component can be applied for simple surface protection of aluminum materials, but it is resistant to press working because of its low stretchability, surface lubricity and adhesiveness. I can't. If the surface protective film is torn or peeled off, the mold and the aluminum material come into direct contact during pressing, and the surface of the aluminum material is damaged.

  Further, since the surface protective film mainly composed of the polypropylene component is transparent, there is a problem that it is difficult to visually recognize the tearing or peeling of the surface protective film when the aluminum material with the surface protective film is pressed. If there is a surface protection film that does not break or peel off during press processing, there is no need for concern about tearing or peeling itself, but there are severe pressing conditions in the press processing, and it is assumed that there will be no tear or peeling at all. Surface protection films that do not need to be done are not realistic. On the other hand, it is possible to add a pigment to a resin component such as polyethylene or polypropylene for coloring, but in the small-scale production, there is a problem that a lot of loss occurs and the manufacturing cost increases.

  The present invention has been made in view of such a problem, and can suppress the tearing and peeling of the film during press working, and can be visually recognized when the tearing and peeling occur. An aluminum material and a press working method thereof are to be provided.

1st invention is an aluminum material with a multilayer film for press processing formed by laminating a multilayer film formed by laminating a resin film layer, a printing layer, and an adhesive layer on the surface of an aluminum material in the adhesive layer,
The resin film layer is composed of a resin film containing a polypropylene resin as a main component, and the printing layer is formed by printing printing ink on the resin film,
The pressure-sensitive adhesive layer is made of a pressure-sensitive adhesive, and is in an aluminum material with a multilayer film for press working (Claim 1).

2nd invention press-processes the aluminum material with a multilayer film for press processing of said 1st invention using the press processing machine provided with the convex punch and the die | dye which has a recessed part engaged with this punch. In the press working method,
The aluminum material with the multilayer film for press working is placed in the die by placing the multilayer film side of the aluminum material with the multilayer film for press working toward the die side and allowing the punch to enter the recess of the die. The present invention resides in a press working method characterized by performing press working to project to the side.

The aluminum material with a multilayer film for press working of the present invention has the multilayer film composed of the resin film layer, the printed layer, and the adhesive layer on the surface of the aluminum material.
The multilayer film is excellent in stretchability and surface lubricity, and is also excellent in adhesiveness between the adhesive layer and the aluminum material. Therefore, the aluminum material with a multilayer film for press processing can be pressed using volatile lubricating oil or without using lubricating oil. Moreover, the multilayer film can be prevented from being torn and peeled off during press working, and the aluminum material can be prevented from being damaged.

  Moreover, since the said multilayer film has the said printing layer, it can be visually recognized easily. Therefore, even if the multilayer film is torn and peeled off during press processing, it can be easily visually recognized.

  Thus, according to the first aspect of the present invention, there is provided an aluminum material with a multilayer film for press working, which can suppress tearing and peeling of the film during press working, and can visually recognize the tear and peeling. be able to.

Next, in the press working method of the second invention, the aluminum material with a multilayer film for press working of the first invention is arranged with the multilayer film side facing the die side, and the die side is arranged. Pressing to project is performed.
Therefore, by making use of the characteristics of the above-mentioned multilayer film excellent in stretchability, surface lubricity, and adhesiveness, it becomes possible to press work with or without using volatile lubricating oil. The film can be prevented from being broken and peeled off, and the aluminum material can be prevented from being damaged.

  In general, in press working in which an aluminum material protrudes to the die side, scratches are likely to occur at the corner (corner portion) on the die side of the processed aluminum material. In the present invention, the multilayer film of the aluminum material with the multilayer film for press working is disposed facing the die side, and the press processing is performed. Generation | occurrence | production of peeling can be suppressed and it can prevent that a damage | wound generate | occur | produces in an aluminum material.

  Even if the multilayer film is torn and peeled off, the multilayer film has the printed layer, so that troubles such as tearing and peeling can be easily recognized.

  Thus, according to the second aspect of the invention, it is possible to provide a press working method capable of suppressing the tearing and peeling of the film during the press working and visually recognizing the tearing and peeling.

Explanatory drawing which shows the cross-section of the aluminum material with a multilayer film for press work in an Example. Explanatory drawing which shows a mode that the aluminum material with a multilayer film for press processing in an Example is pressed. Explanatory drawing which shows the whole shape of the aluminum material with a multilayer film for press work after a press work in an Example.

Next, a preferred embodiment of the present invention will be described.
In the aluminum material with a multilayer film for press working, the multilayer film is formed by laminating the resin film layer, the printing layer, and the adhesive layer, and is attached to the surface of the aluminum material in the adhesive layer.
The said multilayer film WHEREIN: The said resin film layer and the said printing layer can interchange the lamination position in a lamination direction.
That is, in order from the aluminum material side, the first layer may be the adhesive layer, the second layer may be the printed layer, the third layer may be the resin film layer, and the first layer may be the adhesive layer. The resin film layer can be used as the second layer, and the printed layer can be used as the third layer.

The said resin film layer consists of a resin film which has polypropylene resin as a main component.
The polypropylene resin includes a propylene homopolymer, a random copolymer of propylene and an α-olefin having 2 or 4 to 20 carbon atoms, and a block copolymer of propylene and an α-olefin having 2 or 4 to 20 carbon atoms. It is preferable to consist of 1 or more types chosen from a polymer (Claim 2).
In this case, the spreadability, surface lubricity, and adhesiveness of the multilayer film can be further improved.

In the random copolymer and the block copolymer, if the α-olefin to be copolymerized with propylene has more than 20 carbon atoms, the production cost may increase. More preferably, the α-olefin to be copolymerized with propylene has 12 or less carbon atoms.
Examples of the α-olefin copolymerized with propylene in the random copolymer and the block copolymer include ethylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, and 1-dodecene. 3-methyl-1-butene, 3-methyl-1-pentene, 4-methyl-1-pentene, and the like.

In the random copolymer and the block copolymer, the content of α-olefin copolymerized with propylene is preferably 30 mol% or less, and more preferably 10 mol% or less.
In this case, the spreadability of the multilayer film can be further improved. Therefore, the multilayer film can be further prevented from being broken and peeled off during the press working.

The resin film which comprises the said resin film layer has a polypropylene resin as a main component.
The content of the polypropylene resin is preferably 60% by weight or more, and more preferably 90% by weight or more.
In this case, the spreadability of the multilayer film can be further improved. Therefore, the multilayer film can be further prevented from being broken and peeled off during the press working.

The resin film layer can contain a resin other than the polypropylene resin. Examples of the resin other than the polypropylene resin include a polyethylene resin.
As the polyethylene resin, an ethylene homopolymer and / or a copolymer of ethylene and an α-olefin having 3 to 20 carbon atoms can be employed. If the α-olefin copolymerized with ethylene has more than 20 carbon atoms, the production cost may increase. More preferably, the α-olefin to be copolymerized with ethylene has 3 to 12 carbon atoms.

Further, in the copolymer of ethylene and α-olefin, the content of α-olefin is preferably 30 mol% or less, and more preferably 10 mol% or less.
In this case, the spreadability of the multilayer film can be further improved. Therefore, the multilayer film can be further prevented from being broken and peeled off during the press working.

  As such a polyethylene resin, for example, one or more selected from ethylene homopolymer, low density polyethylene, medium density polyethylene, high density polyethylene, and linear low density polyethylene can be employed.

  To the resin film constituting the resin film layer, additives such as a stabilizer, an antioxidant, a colorant, an ultraviolet absorber, and a dispersant can be added within a range that does not interfere with the object of the present invention. .

Next, the printing layer is formed by printing printing ink on the resin film.
The resin film can be subjected to corona treatment in order to facilitate printing of the printing ink.
For printing the printing ink on the resin film, a known printing method such as flexographic printing or gravure printing can be employed.
The printing ink may be either solvent-based or water-based, and various color inks can be used. It may be monochromatic or multicolored. The printed pattern is preferably full-surface printing in order to make it easy to visually recognize the torn or peeled portion of the multilayer film.

Next, the adhesive layer is made of an adhesive.
Preferably, the pressure-sensitive adhesive layer is made of an acrylic pressure-sensitive adhesive (Claim 3).
In this case, an adhesive layer having excellent transparency, weather resistance, heat resistance, and solvent resistance can be formed.

  The acrylic pressure-sensitive adhesive can be obtained by polymerizing (meth) acrylic acid alkyl ester monomers and vinyl monomers copolymerizable therewith. As the polymerization method, solution polymerization or emulsion polymerization using a radical initiator is preferred. The polymerization can be carried out at a temperature of 40 to 90 ° C.

  Examples of (meth) acrylic acid alkyl ester monomers include methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate, butyl acrylate, butyl methacrylate, hexyl acrylate, hexyl methacrylate, octyl acrylate, octyl methacrylate, and nonyl acrylate. One or more selected from nonyl methacrylate, dodecyl acrylate, dodecyl methacrylate and the like can be employed, and the alkyl group in the side chain may be linear or branched.

Examples of vinyl monomers copolymerizable with (meth) acrylic acid alkyl ester monomers include acrylic acid, methacrylic acid, crotonic acid, itaconic acid, maleic acid, fumaric acid, hydroxylethyl acrylate, hydroxylethyl methacrylate, hydroxylpropyl acrylate, hydroxyl Propyl methacrylate, acrylamide, methacrylamide, dimethylaminoalkyl acrylate, vinyl acetate, styrene, acrylonitrile, divinylbenzene, polyethylene glycol diacrylate, polyethylene glycol dimethacrylate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, N-methylolacrylamide, N-methylol methacrylamide, glycidyl acrylate And there is a glycidyl methacrylate and the like.
These vinyl monomers can be appropriately selected so that the copolymer with the (meth) acrylic acid alkyl ester monomer functions as an adhesive at room temperature. Usually, its glass transition point is −60 to 0 ° C.

  In the multilayer film, the pressure-sensitive adhesive layer can be formed using the pressure-sensitive adhesive as it is, and the pressure-sensitive adhesive is blended with the acrylic pressure-sensitive adhesive with various known crosslinking agents and tackifiers. Layers can also be formed. Moreover, a thickener, a film-forming aid, and an antifoamer can also be mix | blended as needed.

The said adhesion layer can be formed by applying the said adhesive to the laminated body of the said resin film and the said printing layer. A known coating method can be employed for the coating.
For example, the pressure-sensitive adhesive layer can be formed by applying the pressure-sensitive adhesive with a reverse roll coater, bar coater, knife coater or the like and drying it. With respect to the laminate of the resin film and the printed layer, the adhesive layer can be laminated on the printed layer side or can be laminated on the resin film layer side.

  In the multilayer film, if the thickness of the resin film layer becomes too small, it may be easily broken and the surface of the aluminum material may not be sufficiently protected. On the other hand, if the thickness becomes too large, the manufacturing cost increases and flexibility may be impaired. Therefore, 10-200 micrometers is preferable and, as for the thickness of the said resin film layer, 30-100 micrometers is more preferable.

If the thickness of the printed layer becomes too small, there is a possibility that sufficient coloring cannot be performed on the multilayer film. On the other hand, if the thickness is too large, the manufacturing cost increases and flexibility may be impaired. Therefore, the thickness of the printing layer is preferably 0.1 to 50 μm.
Moreover, when the thickness of the said adhesion layer is too small, there exists a possibility that sufficient adhesive force may not be obtained. On the other hand, if the thickness is too large, the manufacturing cost may increase. 0.05-20 micrometers is preferable and, as for the thickness of the said adhesion layer, 1-10 micrometers is more preferable.
Therefore, in the present invention, the thickness of the entire multilayer film is preferably 10.15 to 270 μm, and more preferably 31.1 to 160 μm.

Next, the aluminum material is preferably a 1000 series alloy, a 3000 series alloy, or a 5000 series alloy defined in JIS H4000.
As the 1000 series alloy, JIS A1050, JIS A1100, and JIS A1200 are preferable. As a 3000 series alloy. JIS A3003, JIS A3004, and JIS A3104 are preferable. As the 5000 series alloy, JIS A5005, JIS A5052, and JIS A5N01 are preferable.
By using these aluminum materials, it is possible to facilitate the press working of the aluminum material with a multilayer film for press work from the surface of the aluminum material, and to improve the press workability.

Further, from the viewpoint of ease of press working, the aluminum material is preferably a plate material having a plate thickness of 0.1 to 5 mm. The plate thickness of the aluminum material is more preferably 0.3 to 3 mm, and still more preferably 0.5 to 2 mm.
As for the quality of the aluminum material, a wide range of materials from H material to O material specified in JIS H0001 can be used.

  The aluminum material with a multilayer film for press working can be applied to, for example, a casing for an electric / electronic device such as an IT device, an automobile part such as a mall, and the like.

Example 1
Examples of the present invention will be described below with reference to FIGS. 1 to 3, but the present invention is not limited to these examples.
As shown in FIG. 1, the aluminum material 1 with a multilayer film for press working according to this example is
The multilayer film 3 formed by laminating the resin film layer 31, the print layer 32, and the adhesive layer 33 is attached to the surface of the aluminum material 2 in the adhesive layer 33. In this example, the multilayer film 3 is formed by laminating an adhesive layer 33, a printing layer 32, and a resin film layer 31 in this order from the aluminum material 2 side.
In this example, the thickness of the adhesive layer 33 is 6 μm, the thickness of the printing layer 32 is 1 μm, the thickness of the resin film layer 31 is 40 μm, and the thickness of the multilayer film 3 is 47 μm.
Aluminum material 2 is JIS A1050, grade O material, plate thickness 1 mm, width 50 mm, length 125 mm aluminum plate, or JIS A3003 grade O material, plate thickness 1.2 mm, width 50 mm, length 125 mm. Made of aluminum plate.

As shown in FIG. 2, the aluminum material 1 with a multilayer film for press work of this example is subjected to press work by a press machine 4 including a convex punch 41 and a die 42 having a concave portion 425 engaged therewith. Used. In the press working, the multilayer film 3 side of the aluminum material 1 with the multilayer film for press working is arranged toward the die 42 side of the press working machine 4, and the punch 41 enters the recess 425 of the die 42. Thereby, the press work which makes the aluminum material 1 with a multilayer film for press work protrude to the die | dye 42 side is performed.
In this example, it is assumed that the aluminum material 1 with a multilayer film for press working is formed into a tray shape by press working and used for a casing 10 of a portable electronic device as shown in FIG.

In this example, the multilayer film was produced as follows.
That is, first, a 40 μm-thick resin film made of ethylene propylene copolymer (“Torphan 3701J” manufactured by Toray Film Processing Co., Ltd.) was prepared.

Next, using a gravure roll in which a large number of holes having a depth of 20 μm are formed, gravure ink (“NEW-LAP Blue” manufactured by Godo Ink Co., Ltd.) is printed on the entire surface of the resin film, and a printed layer is formed on the resin film. Formed. Thereby, the laminated body of the resin film layer and the printing layer was obtained.
Next, an acrylic pressure-sensitive adhesive (“Acronal 80DN” manufactured by BASF Japan Ltd.) was applied and dried to a thickness of 6 μm on the printed layer side of the laminate using a bar coater to form an adhesive layer.

Thus, as shown in FIG. 1, a multilayer film having a thickness of 47 μm formed by laminating the resin film layer 31, the printing layer 32, and the adhesive layer 33 was produced. The resin component and thickness of the resin film used for the multilayer film of this example are shown in Table 1 described later.
Next, the obtained multilayer film was evaluated for adhesive strength and press workability as follows.

"Adhesive force"
JIS A1050, grade O material, thickness 1 mm, width 50 mm, length 125 mm, and the multilayer film 3 produced as described above are bonded using a pressure roll laminator for press working The aluminum material 1 with a multilayer film was produced (refer FIG. 1). Subsequently, the peeling force when peeling the multilayer film 3 from the aluminum plate 2 at a speed of 300 mm / min (180 degree peeling) is measured, and the peeling force per 25 mm width is defined as adhesive strength (N / 25 mm). Here, the measurement of adhesion and peeling force was performed under the condition of 23 ° C. The results are shown in Table 1 below.

"Press workability"
The multilayer film 3 is attached to the aluminum plate 2 of JIS A3003, grade O material, thickness 1.2 mm, width 50 mm, and length 125 mm in the same manner as the evaluation of the adhesive strength described above, and with the multilayer film for press working An aluminum material 1 was produced (see FIG. 1). Next, as shown in FIG. 2, a press machine 4 including a convex punch 41 and a die 42 having a concave portion 425 engaged therewith is prepared, and the multilayer film of the aluminum material 1 with the multilayer film for press work 1 is prepared. 3 side is arranged toward the die 42 side of the press machine 4, and pressing is performed by making the punch 41 enter the recess 425 of the die 42 while suppressing wrinkles by using the wrinkle presser 43 without using lubricating oil. Processing). Thus, as shown in FIG. 3, the aluminum material 1 with a multilayer film for press work was formed into a tray shape having a height h = 10 mm. And about the aluminum material 1 with a multilayer film for press processing after shaping | molding, the tear of the film of a 10-mm height part, and peeling were observed visually. Those that were not torn or peeled were considered good. The results are shown in Table 1 below.

(Example 2 and Comparative Example 1)
A multilayer film was produced in the same manner as in Example 1 except that the type and thickness of the resin in the resin film layer were changed as shown in Table 1 described below.
That is, in Example 2, a multilayer film was produced in the same manner as in Example 1 except that a resin film made of propylene homopolymer and having a thickness of 40 μm (“SC40” manufactured by Tosero Co., Ltd.) was used. .
In Comparative Example 1, a multilayer film was prepared in the same manner as in Example 1 except that a resin film made of polyethylene and having a thickness of 50 μm (“M-10” manufactured by Tamapoly Co., Ltd.) was used.
The resin components and thicknesses of the resin films used for the multilayer films of Example 2 and Comparative Example 1 are shown in Table 1 described later.

  Subsequently, the multilayer films of Example 1 and Comparative Example 1 were evaluated in the same manner as in Example 1 for adhesive strength and press workability. The results are shown in Table 1.

As is known from Table 1, the multilayer film according to the example of the present invention exhibited excellent adhesiveness comparable to that of Comparative Example 1 with respect to the aluminum material.
In Comparative Example 1, tearing of the film was observed at the corner portion after press processing, but in Examples 1 and 2, the multi-layer film 3 was also applied to the corner portion 19 and other parts in press processing under the same conditions. No tearing or the like occurred (see FIG. 3).

  Thus, in the aluminum material 1 with a multilayer film for press working of Examples 1 and 2, the multilayer film 3 is excellent in stretchability and surface lubricity, and is excellent in adhesiveness to the aluminum material 2 (see FIG. 1). Therefore, the aluminum material 1 with a multilayer film for press working can be pressed without using a lubricating oil as shown in this example. Moreover, the multilayer film 3 can be prevented from being broken and peeled off during the press working, and the aluminum material can be prevented from being damaged.

Moreover, in this example, the multilayer film 3 side of the aluminum material 1 with a multilayer film for press processing 1 having the specific multilayer film 3 is arranged facing the die 42 side, and the aluminum material 1 with the multilayer film for press processing 1 is diced. The press work which makes it protrude to 42 side is performed (refer FIG. 2).
Therefore, making use of the characteristics of the multilayer film 3 excellent in stretchability, surface lubricity, and adhesiveness, it becomes possible to press work without using a lubricating oil as described above, and film breakage during press work and Peeling can be suppressed and damage to the aluminum material can be prevented.
In general, in press working in which an aluminum material protrudes to the die side, scratches are likely to occur at the corner (corner portion) on the die side of the processed aluminum material. In this example, the multi-layer film 3 having a specific composition as described above is placed on the die 42 with the multilayer film 3 having a specific composition facing the die 42, and the press work is performed, so that scratches are likely to occur. Even at the corners (corner portions) 19, the occurrence of tearing and peeling of the multilayer film 3 can be suppressed, and the aluminum material 2 can be prevented from being damaged.

  Moreover, in this example, since the multilayer film 3 has the printing layer 32, the multilayer film 3 can be visually recognized easily. Therefore, even if the multilayer film 3 is torn and peeled during pressing, these can be easily visually recognized.

  As described above, according to the present example, the aluminum material with a multilayer film for press working (Example 1) that can suppress the tearing and peeling of the film during the press working and can visually recognize the tearing and peeling. And 2) and a pressing method thereof.

DESCRIPTION OF SYMBOLS 1 Aluminum material with a multilayer film for press work 2 Aluminum material 3 Multilayer film 31 Resin film layer 32 Printing layer 33 Adhesion layer

Claims (5)

A multilayer film formed by laminating a resin film layer, a printing layer, and an adhesive layer is an aluminum material with a multilayer film for press processing formed by attaching the multilayer film to the surface of the aluminum material in the adhesive layer,
The resin film layer is composed of a resin film containing a polypropylene resin as a main component, and the printing layer is formed by printing printing ink on the resin film,
An aluminum material with a multilayer film for press working, wherein the adhesive layer is made of an adhesive.   2. The aluminum material with a multilayer film for press working according to claim 1, wherein the polypropylene resin is a homopolymer of propylene, a random copolymer of propylene and an α-olefin having 2 or 4 to 20 carbon atoms, and propylene. And an aluminum material with a multilayer film for press working, wherein the aluminum material is one or more selected from block copolymers of α-olefins having 2 or 4 to 20 carbon atoms.   The aluminum material with a multilayer film for press work according to claim 1 or 2, wherein the adhesive layer is made of an acrylic pressure-sensitive adhesive.   The aluminum material with a multilayer film for press work according to any one of claims 1 to 3, wherein the aluminum material is any one of a 1000 series alloy, a 3000 series alloy, or a 5000 series alloy defined in JIS H4000. An aluminum material with a multilayer film for press working. The aluminum material with a multilayer film for press work according to any one of claims 1 to 4 is pressed using a press machine provided with a convex punch and a die having a concave part engaged with the punch. In the press working method to process,
The aluminum material with the multilayer film for press working is placed in the die by placing the multilayer film side of the aluminum material with the multilayer film for press working toward the die side and allowing the punch to enter the recess of the die. A press working method characterized by performing press working to project to the side.

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