JPH06344043A - Molding method for metallic plate and adhesive sheet - Google Patents

Abstract

PURPOSE:To improve the drawing property to metal molds so that drawing is sharply finished without sticking of an adhesive to the metal molds when the drawing is executed. CONSTITUTION:This method has a stage for depositing an adhesive sheet formed by depositing the adhesive 3 on the surface of a film 2a subjected to a matte treatment onto one surface of a metallic plate 1 and laminating a flexible film 4 with a tacky adhesive on the other surface of this metallic plate 1, a stage for peeling the film 2a subjected to the matte treatment and a stage for mounting the metallic plate 1 into the metal molds in such a manner that the adhesive 3 surface of the metallic plate comes into contact with the one metal mold 5a and the flexible film 4 side of the metallic plate 1 comes into contact with the other metal mold 5, then subjecting the metallic plate to outside shape blanking simultaneously with drawing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a thin metal plate, which is suitable for forming a metal decorative plate for automobiles and electronic products, and a method for forming such a metal plate. And a suitable adhesive sheet.

[0002]

2. Description of the Related Art Generally, a metal decorative plate for automobiles and electronic products by drawing has been carried out as shown in FIG.

In FIG. 3A, reference numeral 1 denotes a metal plate made of stainless steel having a thickness of 0.1 mm to be drawn. First, as shown in FIG. 3A, one surface of the metal plate 1 has a thickness of 25 μm, for example. Of polyethylene terephthalate (S10, manufactured by Toray Industries, Inc.) is coated with an adhesive sheet having an ethylene vinyl acetate copolymer-based adhesive 3 coated on one surface thereof, and the other surface of the metal plate 1 is used as a protective film. A flexible film with adhesive (Sekisui Chemical Co., Ltd. # 623E thickness 75 μm) 4 is laminated.

Next, as shown in FIG. 3B, a male die 5a and a female die 5 are formed.
Outer shape drawing and drawing are performed at the same time by a die made of b.

After that, the release film 2 is removed as shown in FIG. 3C, and a molded body 6 of ABS resin, for example, is adhered to the adhesive 3 side of the metal plate 1 by a hot press machine as shown in FIG. Was peeled off.

In the manufacturing method of FIG. 3, since the outer shape is punched and drawn by the molds 5a and 5b while the peeling film 2 is attached, there is a disadvantage that the edge of the metal decorative plate is not sharp and the peeling occurs. There was an inconvenience that wrinkles generated in the film 2 appeared on the surface of the metal decorative plate.

Therefore, in the manufacturing method shown in FIG. 3, after the adhesive sheet is applied to the metal plate 1, the release film 2 is peeled off, and then the outer shape drawing and the drawing process are simultaneously performed by the molds 5a and 5b. Although conceivable, in this case, the adhesive surface of the adhesive 3 is smooth, adheres to the mold 5a, and there is a disadvantage that continuous punching cannot be performed.

When the aperture is large, a striped pattern is generated on the surface of the metal plate 1 in the aperture, resulting in a poor appearance.

Then, as the adhesive 3, a mold 5a is further provided.
On the other hand, it is possible to use a hard adhesive with good slipperiness, but this hard adhesive with good slippery has the disadvantage that it is difficult to adhere to plastics such as polyolefin, and this adhesive has a low temperature. There was a disadvantage that the impact strength was inferior to the adhesive strength.

In view of the above problems, an object of the present invention is to propose a method for molding a metal plate and an adhesive sheet, which are designed to improve the above-mentioned inconvenience.

[0011]

A method for molding a metal plate according to the present invention is, for example, as shown in FIG.
A step of applying an adhesive sheet having the adhesive 3 applied to its surface on one side of the metal plate 1 and laminating the flexible film with adhesive 4 on the other side of the metal plate 1 (FIG. 2A). ) And a step of peeling off the matte-treated film 2a (FIG. 2B),
The adhesive 3 surface of the metal plate 1 hits one mold 5a,
The metal plate 1 is mounted in the mold so that the surface of the flexible film 4 contacts the other mold 5b, and the outer shape is punched simultaneously with the drawing process.

The adhesive sheet of the present invention has a thickness of 20 μm to 1 on the matte surface 2b of the film 2a as shown in FIG.
A thermoplastic adhesive layer 3 having a thickness of 20 μm is provided.

[0013]

According to the present invention, the adhesive sheet adhered to one surface of the metal plate 1 is obtained by applying the adhesive 3 to the surface of the matte-treated film 2a. Has a myriad of fine irregularities corresponding to the matte treatment on its surface facing the mold 5a.
When the outer shape cutting and the drawing processing are simultaneously performed by b,
The adhesive 3 does not adhere to the mold 5a, the sliding property with respect to the mold is good, and the drawing process is finished sharply.
The appearance of the metal plate surface was very beautiful.

[0014]

EXAMPLES Examples of the method for molding a metal plate and the adhesive sheet of the present invention will be described below with reference to FIGS. 1 and 2, parts corresponding to those in FIG. 3 are designated by the same reference numerals.

In this example, an adhesive sheet as shown in FIG. 1 was prepared as an adhesive sheet to be attached to one surface of the metal plate 1. In FIG. 1, reference numeral 2a denotes a polyethylene terephthalate peeling film having a thickness of 25 μm,
Sand mat processing, that is, countless fine irregularities are formed on one surface 2b of the film 2a.

In this case, the mat depth is 1 μm to 10 μm.
The range of μm (Rmax) is good. When the mat depth is 10 μm or more, there is a problem that the peeling of the adhesive 3 described later becomes heavy. Further, when the thickness of the film 2a is thin, about 25 μm, mechanical strength such as tensile strength and elongation decreases, so that the mat depth is 1.0 μm to 1.0 μm.
4.0 μm is preferable. As the matte-treated polyethylene terephthalate, PS-25 manufactured by Teijin Ltd. can be used. The matte depth of the polyethylene terephthalate film 2a having a thickness of 25 μm used in this example is measured by a surface roughness meter (kosaka laboratory Ltd. type SP).
-11, AS-3H, RA-60A), Ra was 0.27 μm and Rmax was 3.31 μm. Here, Ra is the centerline average roughness, and Rmax is the maximum height.

In this example, the peeling film 2 is used.
As shown in FIG. 1, a thickness of 40 μm on the mat-treated surface 2b of a.
An ethylene vinyl acetate copolymer-based adhesive 3 of m to 50 μm is extruded with a T die of an extruder and laminated.

In this example, as the ethylene vinyl acetate copolymer-based adhesive, an ethylene vinyl acetate copolymer: 50 parts by weight (Evaflex EV360: manufactured by Mitsui DuPont Polychemical Co.) styrene / butadiene rubber: 20 parts by weight (TR-KX-65: Shell Chemical Co., Ltd.) Petroleum resin: 30 parts by weight (Alcon M100: Arakawa Chemical Co., Ltd.) Antioxidant: 0.5 parts by weight (ANTAGE DBH: Kawaguchi Chemical Co., Ltd.) The adhesive raw material to be composed is dry blended with a tumbler, and melt-kneaded at a temperature of 170 ° C. with an extruder.
Cool the adhesive extruded into a string through a water tank and cut it with a pelletizer to create a pellet-shaped adhesive,
1 to 1 of this pellet adhesive in an oven at 70 ° C
After drying for 2 hours, the dried pellet-shaped adhesive was extruded into a film (thickness 40 μm to 50 μm) from a T-die at a temperature of 170 ° C. again using an extruder, and the thickness 40
Immediately apply (1
Before cooling to below 00 ° C.), the film 2a for peeling is laminated on the mat-treated surface 2b (nip pressure 1.
0-3.0 kg / cm).

Next, with reference to FIG. 2, a method for molding a metal plate using the above adhesive sheet will be described.

In this example, first, as shown in FIG. 2A,
Adhesion of an adhesive sheet obtained by laminating an adhesive 3 on one surface of a metal plate 1 made of stainless steel having a thickness to be drawn, for example, 0.1 mm, and on the mat-treated surface 2b of the peeling film 2a as described above. The surface of the agent 3 is adhered with a heating roll under the conditions of 160 ° C., 3 kg / cm, 1 m / min, and the other surface of the metal plate 1 is protected by a flexible film with an adhesive (Sekisui Chemical Co., Ltd.). Product # 623E (thickness: 75 μm) is laminated.

Next, as shown in FIG. 2B, the matte film for peeling 2a is peeled off. In this case adhesive 3
The peeling surface of the peeling film 2a is the peeling film 2
Innumerable fine irregularities corresponding to the mat treatment a) are formed.

Next, as shown in FIGS. 2C and 2D, this metal plate 1
The adhesive 3 is attached to the molds 5a and 5b so that the 3 faces of the adhesive hit the male mold 5a, which is one mold, and the flexible film 4 face of the metal plate 1 touches the female mold 5b, which is the other mold. , Drawing and outline cutting are performed at the same time.

In this case, on the surface of the adhesive 3 from which the peeling film 2a has been peeled off, which faces the male die 5a, there are innumerable minute irregularities corresponding to the mat processing, and the die 5a and 5b are used for drawing and When the outer shape was removed at the same time, the adhesive 3 did not adhere to the male die 5a, and the sliding property with respect to the male die 5a was good.

Further, in this case, since the peeling film 2a was peeled off, the drawing process was finished sharply, and the appearance of the surface of the metal plate 1 was very beautiful.

Thereafter, as shown in FIG. 2E, a molded body 6 of ABS resin, for example, is formed on the adhesive 3 side of the metal plate 1 at 150 ° C.
A metal decorative plate was obtained by bonding with a hot press machine under the conditions of 3 kg / cm ² and 10 seconds. The adhesive-attached flexible film 4, which is a protect film, is peeled off if necessary.

According to the present embodiment, the adhesive sheet adhered to one surface of the thin stainless steel plate 1 having a thickness of, for example, 0.1 mm has the adhesive film 3 applied to the surface of the peeling film 2a which has been mat-treated. Since the peeling film 2a is peeled off, the surface of the adhesive 3 facing the mold 5a has a myriad of fine irregularities according to the matte treatment. When the drawing process is performed at the same time, there is an advantage that the adhesive 3 does not adhere to the mold 5a and the sliding property with respect to the mold 5a is good.

Further, according to this embodiment, the outer shape is drawn and drawn by the molds 5a and 5b after the peeling film 2a is peeled off, so that the drawing is finished sharply and the appearance of the surface of the metal plate is very clean. There are benefits that are.

In the above embodiment, the thickness of the adhesive 3 applied on the peeling film 2a is 40 μm to 50 μm.
However, the thickness of the adhesive 3 is 20 μm to 12 μm.
0 μm is sufficient. If the thickness of the adhesive 3 is 120 μm or more, the sharpness of the drawn edge is poor, and the thickness is 20 μm.
In the following, there is an inconvenience that the adhesive strength is insufficient.

Further, the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.

[0030]

According to the present invention, there is an advantage that when the outer shape is drawn and drawn by the mold, the adhesive does not adhere to the mold and the sliding property with respect to the mold is good.

Further, according to the present invention, after the peeling film is peeled off, the outer shape is drawn and drawn by the mold, so that the drawing is finished sharply and the appearance of the surface of the metal plate is very beautiful. There is.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of an adhesive sheet of the present invention.

FIG. 2 is a cross-sectional view for explaining an embodiment of the method for molding a metal plate of the present invention.

FIG. 3 is a cross-sectional view for explaining an example of a conventional method for molding a metal plate.

[Explanation of symbols]

 1 Metal Plate 2a Film 3 Adhesive 4 Flexible Film with Adhesive 5a, 5b Mold 6 Molded Body

Claims (3)

[Claims] 1. An adhesive sheet having an adhesive applied to the surface of a mat-treated film is applied to one surface of a metal plate, and a flexible film with an adhesive is laminated on the other surface of the metal plate. In the mold so that the adhesive surface of the metal plate hits one mold, and the flexible film surface of the metal plate hits the other mold. A method of forming a metal plate, comprising the steps of mounting and drawing the outer shape at the same time as drawing. 2. The matte surface of the film has a thickness of 20 μm to 1
An adhesive sheet comprising a thermoplastic adhesive layer having a thickness of 20 μm. 3. The adhesive sheet according to claim 2, wherein
An adhesive sheet having a matte surface having a mat depth of 1 μm to 10 μm.