Method for manufacturing decorative piece of thermoplastic synthetic resin
The present invention provides a method for manufacturing a decorative piece made of a thermoplastic synthetic resin and capable of providing a suede-like appearance. The method for manufacturing the decorative piece 10 comprises preparing a film-like or sheet-like upper layer material 30 made of thermoplastic synthetic resin, placing the upper layer material on a table 46 that serves as a lower electrode, putting an engraved die 41 that serves as an upper electrode on the upper layer material, and subjecting the upper layer material to high-frequency dielectric heating by oscillating high-frequency between the table and the engraved die, wherein the upper layer material is printed with a decorative ink containing urethane beads mixed in medium on a specified surface area 31 thereof, and wherein the engraved die has a texture engraved surface 42 formed by a laser engraving process on an area opposing the specified surface area of the upper layer material, whereby a suede-like unevenness is formed in the specified area of the upper layer material by the high-frequency dielectric heating.
1 . A method for manufacturing a thermoplastic synthetic resin-made decorative piece with an upper surface having a first area and a second area of different pattern depths, the method comprising:
a step of producing an engraved die with a first engraved surface and a second engraved surface, wherein the first engraved surface is formed using a laser engraving process to have fine unevenness, the fine unevenness comprising depressions of about 0.01 mm to 0.3 mm in width and about 0.01 mm to 0.3 mm in depth, and the second engraved surface is formed to have a groove deeper than the depressions of the first engraved surface,
a step of preparing a decorative piece material including an upper layer material in a film or sheet form made of a thermoplastic synthetic resin, wherein the upper layer material has the first area and the second area, and the first area is subjected to a decorative ink printing process using a decorative ink containing urethane beads mixed in medium,
a step of putting the decorative piece material on a table, serving as a lower electrode, such that the upper surface faces upward,
a step of placing the engraved die, to serve as an upper electrode, on the upper layer material such that the first engraved surface of the engraved die is opposite to the first area of the decorative piece, and the second engraved surface of the engraved die is opposite the second area of the decorative piece, and
a step of subjecting the decorative piece material to high-frequency dielectric heating by oscillating a high-frequency between the table and the engraved die to produce the decorative piece shaped along the first engraved surface and the second engraved surface of the engraved die, and
when the engraved die is removed, the decorative piece is produced, wherein
the first area of the decorative piece has a pattern of a fine unevenness that follows the fine unevenness of the first engraved surface, and the second area of the decorative piece has a pattern that follows the deeper groove of the second engraved surface.
2 . The method according to claim 1 , wherein the step of preparing the decorative piece comprises subjecting the first area of the upper layer material to a silk-screen printing with a colored ink containing a pigment and/or a dye prior to the decorative ink printing process.