JPS62152710A - Manufacture of release sheet for shaping irregularities - Google Patents

Abstract

PURPOSE:To make it possible to simply manufacture a release sheet for shaping with irregular pattern faithful to a master form at low cost by a method wherein an embossed plate, which is faithful to the master form, is made and high frequency heating molding is performed to a thermoplastic synthetic resin sheet by employing said embossed plate. CONSTITUTION:A wooden plate is used as a master form 1 in order to form a negative matrix 2 and further a positive embossed plate 3 by using two-pack type casting silicone. In addition, a laminated sheet of a vinylchloride resin sheet and a Vinylon film is used as a thermoplastic synthetic resin sheet 4. The lower metal pressing plate 7, the embossed plate 3, the thermoplastic synthetic resin sheet 4 with the Vinylon film surface facing downwards, neoprene rubber sponge cushioning material 5 and an upper metal pressing plate 6 are piled up in the order named so as to apply a pressure of 5kg/cm<2> by pressing down the upper metal pressing plate 6. At the same time, high frequency electric current of 2A with 27MHz is applied for 45sec across the upper and lower metal pressing plates. After that, the metal pressing plates are cooled with water for 70sec in order to obtain a release sheet product for shaping with oak wood grain pattern on the Vinylon film surface side.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Industrial Field of Application The present invention relates to a release sheet for forming an uneven pattern, which is mainly used to form a hardened surface with an uneven pattern by adhering to the surface layer of the decorative board when manufacturing the decorative board. 1! ! 7 Concerning the method of building.

Conventional technology A release sheet for forming unevenness forms an uneven pattern on the surface of the cured material by adhering it to the surface of a fluid curable material that can be plastically deformed and peeling it off after the material hardens. be.

This release sheet for uneven molding is produced by heat-embossing a thermoplastic film that has no affinity for curable materials with a metal or synthetic resin template or roll having an uneven surface, or by molding a synthetic resin in a fluid state. % by means such as pouring into and hardening and molding! It is built.

Problems to be solved by the invention In the conventional manufacturing method described above, the template, embossing [1-
It takes a long time to manufacture a mold and requires a large amount of money, and it is difficult to find a mold that faithfully reproduces the desired uneven pattern. ? There were problems such as bad TBJ.

20 Means for Solving Problems The present invention uses an embossing plate made of silicone for casting to form an uneven pattern on a thermoplastic synthetic resin film under high-frequency dielectric heating. This method solves the problems of the conventional method.

That is, in the present invention, silicone for casting is poured onto a master surface having an uneven pattern surface and cured to obtain a negative T'' mold.
Furthermore, casting silicone is poured into the negative mold and cured to create a positive embossing plate, and the embossing plate is made of thermoplastic material such as vinyl chloride, acrylic, nylon, or cellulose, which can be easily subjected to high-frequency dielectric heating. A synthetic resin sheet is placed and a metal pressing plate is pressed against both sides of the sheet, and a high frequency current is applied using the metal pressing plate as an electrode to form the original negative uneven pattern surface on the surface of the thermoplastic synthetic resin sheet. This is a method for producing a release sheet for forming an uneven pattern.

Ho0 action Hereinafter, details of the method of the present invention will be explained with reference to the drawings.

FIG. 1 schematically explains the process of creating an embossing plate, where 1 is a prototype, 2 is natural wood, 2 is stone, leather, fiberglass, or any other hard object with an uneven pattern formed thereon.

Reference numeral 2 is a cast-cured silicone molded body, which is a negative master mold with concavities and convexities opposite to the original mold.

Reference numeral 3 denotes a positive embossing plate having an uneven pattern opposite to that of the mother mold 2, that is, similar to the master mold 1, which was cast and hardened on two sides of the negative mother mold 19.

The silicone used to form the embossing plate 3 is usually two-component curable, with heat resistance of 200°C or higher, low dielectric loss, and hardness of 7.
It is desirable that a cured product of 0' or more can be obtained.

FIG. 2 is a side view schematically showing a means for creating a molding sheet, in which a sheet 4 made of a single thermoplastic synthetic resin or a VJ layer is placed on the mold surface of the embossing plate 3. .

5 is a cushioning material such as silicone cloth or urethane sponge cloth 1 to 5. 6 is an upper metal pressing plate, and 7 is a lower metal pressing plate, each of which is connected to a high frequency power source 8 and serves as an electrode.

In the above condition, the metal pressing plates 6 and 7 are usually 5 to 10 k
Applying compression pressure of l'a+r, embossed plate 3° thermoplastic synthetic resin sheet 4. By pressing the cushion material 5 and applying a high frequency current of about 20 to 50 MH2 using the metal pressing plates 6 and 7 as electrodes, usually for 30 to 90 seconds,
The thermoplastic synthetic resin sheet 4 is softened by heat generation, while the embossed plate 3. The cushion material 5 does not generate heat, therefore,
The mold surface of the embossing plate 3 is not deformed, and the 4 surfaces of the thermoplastic synthetic resin sheet are imprinted faithfully to the original shape. After the pressurizing conditions are maintained until the sheet 4 is cooled and hardened, the metal press plates 6 and 7 are separated and the product is taken out. It is preferable to provide, for example, a water cooling means to actively cool the metal press plates 6 and 7, since the cooling time can be shortened to about 60 seconds and the molding cycle can be speeded up.

FIG. 3 is a cross-sectional view showing an example of the obtained release sheets 1 to 1, in which 9 is a vinyl chloride resin sheet, 10 is a polyvinyl alcohol resin film, both are laminated, and the uneven pattern is made of polyvinyl alcohol. system resin film 1
It is formed on the 0 side.

Example Using a wooden board (A-board material) as a prototype, a two-component casting silicone (KE-24RTV rubber manufactured by Shin-Etsu Chemical Co., Ltd.) was used to create a positive embossing plate (35 x 55 x
1 cm) was created.

As the thermoplastic synthetic resin sheet, a laminate sheet of a vinyl chloride resin sheet (30 pHr plasticizer, 300 μm thickness) and a vinylon film (25 μm thickness) was used.

As shown in Figure 1, on the lower metal pressing plate of the compression device,
On top of the embossed plate, stack the thermoplastic synthetic resin sheet and neoprene rubber sponge cushion with the vinylon film side down, and push down the upper metal pressure plate to achieve 5kG!
At the same time as applying a breath pressure of /cy/, a high-frequency current of 2 amperes at 27 MHz was applied to the upper and lower metal pressing plates for 45 seconds, and then the metal pressing plates were water-cooled for 70 seconds to form the metal press plate as shown in Figure 3. A release sheet product for molding with an oak wood grain pattern on the vinylon film side was obtained.

A decorative board was manufactured using the release sheet for molding in the following manner.

A decorative titanium paper printed with an oak surface pattern is attached to the plywood surface using an adhesive, and an unsaturated polyester resin liquid mixed with a crosslinking agent, a polymerization initiator, a catalyst, and other additives is cast onto the decorative titanium paper. Immediately, the above mold-forming release sheet was applied with its vinylon side brought into close contact with the resin liquid surface, the resin was cured under heating at room temperature or constant temperature, and then the mold-forming release sheet was peeled off.

The obtained polyester decorative board had a surface grain unevenness pattern similar to that of the original oak wood, and had excellent glossy color tone and surface physical properties, and was extremely desirable.

G1 Effects of the Invention According to the method of the present invention, an embossing plate faithful to the original can be easily obtained, and a thermoplastic synthetic resin sheet can be rapidly and stably subjected to high-frequency heat molding using the embossing plate. Therefore, many difficulties in manufacturing molds using conventional resins containing 9-containing resin are solved, and a release sheet for molding having an uneven pattern that is faithful to the original mold can be easily and conveniently manufactured.

In addition, as a result of the above, there is a wide variety of products in the production of release sheets for molding.
It will also be easier to handle small lots and short delivery times.

[Brief explanation of drawings]

Figure 1 is an explanatory schematic diagram showing the process of creating an embossing plate using silicone, Figure 2 is a side view schematically showing means for creating a release sheet for molding, and Figure 3 is an example of a release sheet for imprinting. FIG. 1... Prototype 2... Negative matrix 3... Embossing plate 4... Thermoplastic synthetic resin sheet 5... Cushioning material 6, 7... Kinkuri pressing slope 8...
・High frequency power supply

Claims (1)

[Claims] A negative mold is obtained by pouring silicone for casting onto the surface of the master mold having an uneven pattern surface and hardening it.Furthermore, silicone for molding is poured into the negative mother mold surface and hardened to create a positive embossing plate, and the embossing A thermoplastic synthetic resin sheet is placed on the plate, metal pressing plates are pressed against both sides of the sheet, and a high frequency current is applied using the metal pressing plates as electrodes.
A method for producing a release sheet for forming unevenness, the method comprising forming an original negative uneven patterned surface on the surface of a thermoplastic synthetic resin sheet.