JPH0130205B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a method for manufacturing a vinyl record having metallic luster.

(Prior art) Records with metallic luster, which are made by vapor-depositing metal on one side of the substrate and then applying a protective coating made of synthetic resin, have already been published in Utility Model Publication No. 43-13462.
It has been proposed in Publication No. 36-1496 or Publication Utility Model Publication No. 1496, etc.

Since the metal layer of this type of record is protected by a coating on the surface, the metal layer is not susceptible to mechanical damage due to contact with a needle, etc., adhesion of dust due to static electricity, or moisture. It has the advantage of being able to suppress deterioration and maintain its metallic luster over a long period of time, but on the other hand, a record master with this kind of metal layer is actually pressurized and heated using a stamper press to stamp one side or the other. When sound grooves are formed on both sides, the metal layer, which has no extensibility, cannot follow the extension in the plane direction of the master disc that occurs during press processing, resulting in countless cracks in the metal film. There were problems in processing such as the occurrence of metal luster and the loss of metallic luster.

(Purpose) The present invention was made in view of the above problems, and its purpose is to provide a new method for manufacturing a record that can be molded without losing its metallic luster. .

(Means for Solving the Problems) That is, the present invention provides a method for manufacturing a record having metallic luster to achieve the above problems, by depositing a metal layer on one side of a sheet and depositing a metal layer on the top surface of the metal layer and the sheet. A disk with a metallic luster coated with a transparent resin film on the other side is covered with a transparent thermoplastic resin sheet on the side without the metal layer, and a transparent thermoplastic resin material on the side with the metal layer. A pair of upper and lower stamper presses each having a female sound groove formed thereon presses and heats the mass to form sound grooves on both sides.

(Example) To explain in detail the example shown in the drawings, FIG. 1 shows the state before pressing, heating, and cooling are performed by the press plates 4 and 5 of the stamper, and a flat circular transparent thermoplastic resin sheet 1 is A disk 2 having metallic luster according to the present invention and described later, which has substantially the same shape as the disk, is placed concentrically on the disk.

3 is a block made of a transparent thermoplastic resin that is made of the same material as the sheet 1 and easily fuses with the sheet 1 when heated, and the shape is not limited, but a shape that does not protrude from the sheet 1 is selected. The amount of resin needs to be slightly larger than the equivalent amount of resin constituting the sheet 1.

In this way, the sheet 1 is placed on the press plate 4 of the lower stamper. In this case, the diameter of the sheet 1 is the sound groove forming portion 7 of the press plate 4 of the lower stamper.
It is desirable to make it slightly larger.

The press plates 4 and 5 of the upper and lower stampers are schematically shown in Figs. 1 and 2. In the press plate 4 of the lower stamper, the press plate 4 is placed approximately in the center of the upper surface, and in the press plate 5 of the upper stamper, the press plate 5 is placed on the bottom surface. A sound groove forming portion 7 is formed in a slightly recessed area approximately in the center, and the press plates 4 and 5 of both stampers are indicated by arrows 10 and 1 in FIG.
When pressed in one direction, the sound groove forming portions of the press plates 4 and 5 of both stampers overlap each other. A spiral female sound groove is formed in the sound groove forming part 7, and the sound groove non-forming part 8 in the center is slightly recessed than the sound groove forming part 7. A pin 6 for forming the shaft hole of the tone disk is implanted.

Further, the press plates 4 and 5 of the stamper are provided with heating means for heating them when pressed in the directions of arrows 10 and 11, and cooling means for cooling them next, but this point is not known in the art. Since it belongs to the above, it is omitted from the illustration.

Next, the disk 2 having metallic luster according to the present invention will be described with reference to FIG.
On one side 22 of the base metal layer 2, which is less susceptible to deterioration and has a high gloss reflective property, such as aluminum.
4 is deposited to a thickness of 400 Å to 600 Å.

Next, resin films 25, 25' of a desired transparent color are formed on the upper surface of the base metal layer 24 and the surface 23 of the resin sheet 21 on which the base metal layer 24 is not formed.
It is coated with.

Thus, the sheet 1, the disk 2 having metallic luster, and the block 3 of transparent synthetic resin are placed between the press plates 4 and 5.
, and press both press plates 4 and 5 in the direction of arrows 10 and 11.
While pressing in the direction of , it is heated by the heating means.
Then, the upper press plate 5 softens the lump 3 of transparent synthetic resin in contact with it at high temperature, and forms only the softened lump 3 into a resin film covering the base metal layer 24 without applying any stretching action to the resin sheet 21. 25
While sliding it on the top and stretching it to form the sound groove 3' and the central thick part 14, the lower press plate 4 is
Only the thermoplastic resin sheet 1 stacked on the lower surface of the resin sheet 21 is stretched to form the sound groove 3' and the central thick part 14 therein. Along with this, transparent resin lump 3
The stretched surplus resin is pushed out along the periphery of the upper press plate 5 and fused 12 to the periphery of the sheet 1, as shown in an enlarged view in FIG.

Resin disc 1 with upper and lower sound grooves formed by this
and 3', there is no risk of peeling across the disk 2 having metallic luster, and there is no risk that disk 2 having metallic luster will be corroded by coming into contact with the air around the outer periphery.

Both press plates 4 and 5 are cooled by the cooling means,
When this is opened in the direction opposite to the arrows 10 and 11, the resin discs 1 and 3' on which the sound grooves are formed are moved to the press discs 4 and 11.
5, and has a cross-sectional shape as shown in FIG. 5, which has a shaft hole 13 in the center, a thick part 14 that fills the non-sound groove part 8 around this hole, and has a metallic luster on the entire surface. A sound disk having a cross-sectional shape is obtained.
Such a disc has a disc display 15 on the thick wall part 14.
Since it is not possible to insert labels 15' and 15' into the non-sound groove forming portions 8 on the inner surfaces of both press plates 4 and 5 in the state shown in FIG. Accordingly, the label can be integrally attached onto the thick portion 14.

It goes without saying that the excess resin extruded around the periphery of the record obtained as described above is cut and removed in the same manner as in the conventional case.

(Effects) As described above, according to the present invention, a block made of a transparent thermoplastic resin material is placed on the side of the sheet on which the metal layer is provided, with a resin film thereon, and on the other side of the sheet. A transparent thermoplastic resin sheet is layered on top of the coated resin film, and then press molding is performed, so the sheet and metal layer are simply heated and softened without any stretching action during press molding. It is possible to form sound grooves in the lump of thermoplastic resin material and the thermoplastic resin sheet by stretching them respectively on the resin film, without causing any cracks in the metal layer. , it is possible to mold beautiful records while retaining the original metallic luster.

Moreover, since the sheet surface on the side that does not have a metal layer is stacked with thermoplastic resin sheets instead of lumps, the master disk can be placed on the press plate easily and accurately, making press processing extremely easy. It can be done efficiently.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of the apparatus for carrying out the process according to the present invention before the press operation, Fig. 2 is a sectional side view of the same after the press process is completed, and Fig. 3 is a portion of the disk having metallic luster according to the present invention. FIG. 4 is an enlarged sectional view of the edge of a record with metallic luster according to the present invention taken out from a press disk, and FIG. 5 is a partially enlarged sectional view including the sound groove-free portion. . 1...Transparent thermoplastic resin sheet, 2...Disc with metallic luster, 3...Clump of transparent thermoplastic resin, 4, 5
...Press plate, 6... Axis pin, 7... Sound groove forming part, 14
...thick part, 15'...label, 21...resin sheet,
24...Base metal layer, 25, 25'...Transparent resin film.

Claims (1)

[Claims] 1. A disk with metallic luster in which a metal layer is deposited on one side of the sheet and a transparent resin film is coated on the top surface of the metal layer and the other side of the sheet, and a transparent thermoplastic is coated on the side without the metal layer. The resin sheets are stacked, and a lump of transparent thermoplastic resin material is placed on the side with the metal layer, and then these are pressed and heated using a pair of upper and lower stamper presses with female sound grooves formed on both sides. A method for manufacturing a record having metallic luster, characterized by forming sound grooves.