JPS6123085B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a method for manufacturing a pictorial record,
In particular, it is an object of the present invention to manufacture a pictorial record disc with excellent sound quality by forming the sound groove of the record disc in a good shape.

Conventionally, the method for producing this kind of illustrated record disc is to place stamina bars inside the upper and lower molds of a record press mold, and to attach a surface made of a transparent or translucent thermoplastic resin sheet to the center axis of each mold. Insert the printed paper with calligraphy, drawings, photographs, etc. in this order, and then insert a core material made by heating and gelling a thermoplastic resin between the printed paper and the printed paper inserted into the upper and lower molds. There is a manufacturing method in which a mold is heated, closed, and then heated and cooled. However, according to this method, sound grooves are formed in the surface material made of a thermoplastic resin sheet, but the surface material hardly flows during molding, and the core material is made by heating and gelling the thermoplastic resin in advance. Since the sound flows radially, the shape of the sound groove becomes incomplete, and as a result, illustrated records with inferior sound quality are manufactured. In addition, in order to improve the sound quality, a heated gelled surface material made of thermoplastic resin and a heated gelled surface material made of printing paper and thermoplastic resin were sequentially inserted into the center axis of the lower mold of the press mold. There is also a manufacturing method that heats the mold, closes it, and then heats it and then cools it, but with this method, the surface material flows radially around the center axis of the mold, and the sound grooves are completely formed, but the surface material When the paper flows, a large tensile force is applied to the printing paper, which causes the printing paper to tear, making it difficult to produce good-quality illustrated records.

The present invention eliminates these drawbacks and will be described below with reference to the drawings.

Figures 1 and 2 show the record press machine and manufacturing process. In Fig. 1, 1 is the upper mold, 2
are pivotally connected to each other in the lower mold, and stub bars 3 and 4 are arranged inside them, respectively, and the lower mold 2 is provided with a central shaft 5. Actually, upper mold 1,
There are passages through which water vapor and cooling water pass inside the lower mold 2, and both molds are configured to be heated and cooled. Here, on the center axis 5 of the lower mold 2, a surface material 6 made of thermoplastic resin that has been heated and gelled in advance as shown in FIG. Next, a thermoplastic resin sheet is inserted, followed by printing paper 9 on which calligraphy, drawings, photographs, etc. have been printed, and a surface material 10 made of thermoplastic resin that has been heated and gelled in advance.

In this state, the upper and lower molds 1 and 2 are heated, and when the molds are closed and further heated and compressed, the surface materials 6 and 10 flow radially around the central axis 5 of the lower mold, thereby forming a sound groove. Ru. Thereafter, the mold is cooled in a closed state to integrate the surface material and the reinforcing material to produce an illustrated record. Note that a reinforcing material 8 may be inserted between the printing paper 7 and the printing paper 9, and a material that has been integrated in advance by adhesive welding or the like may be inserted between the surface materials 6 and 10 to produce the reinforcing material 8. Furthermore, instead of the thermoplastic resin sheet, paper, metal plate, metal mesh, woven fabric, etc. may be used as the reinforcing material. Next, examples of formulations of surface materials and sheets will be shown.

Vinyl chloride copolymer Polymerization degree 450-550 100 parts Organotin butyrate 1-2 parts Calcium stearate 0.2-0.3 parts are mixed, heated and kneaded and extruded using an extruder to form tablets with a diameter smaller than the diameter of the printed paper. A pre-formed material is used as the surface material. Also 0.2
~0.4m/m thick art paper with photos, etc. in diameter 290m/
Offset printing is performed within the circle of m to create printed paper. Straight PVC polymerization degree 700~1000, thickness 0.1~0.2m/
A circular film with a diameter of approximately 290 m/m is used as a sheet.

As explained in FIGS. 1 and 2, the above-mentioned materials are inserted into the center axis of a mold of a press machine equipped with stampers 3 and 4 in the order shown in FIG. 2, and press-molded. As described above, according to the present invention, after the surface material, printing paper, reinforcing material, printing paper, and surface material are sequentially inserted into the center axis of the lower mold of a press mold, the mold is heated, closed, and then heated and compressed. Therefore, the surface material flows around the central axis, and the sound groove is formed without deformation. Furthermore, since the reinforcing material is interposed between the printed sheets, it is possible to prevent the printed sheets from tearing due to the flow of the surface material. Therefore, the present invention has the feature that it is possible to produce a pictorial record disc with a considerably better S/N ratio and better sound quality than conventional pictorial record discs.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a record press for carrying out the method of the present invention, and FIG. 2 is an explanatory view for explaining the manufacturing process thereof. 1 is the upper mold, 2 is the lower mold, 3 and 4 are the stub bars, 5 is the center axis of the lower mold, 6 and 10 are the surface materials,
7 and 9 are printing paper, and 8 is a reinforcing material.

Claims (1)

[Claims] 1 Insert the heat-gelled surface material made of thermoplastic resin, printing paper, reinforcing material, and heat-gelled surface material made of printing paper and thermoplastic resin into the center axis of the lower mold of the record press mold in these order. Production of a record disc, characterized in that a press mold is heated, closed, further heat-pressed, the press mold is cooled, and the above-mentioned surface material and reinforcing material are integrated to form a pictorial record disc. Method.