Method and apparatus for producing three-dimensional decoration piece made of thermoplastic synthetic resin

An apparatus configured to produce a three-dimensional decoration piece of thermoplastic synthetic resin according to a method comprising:

• putting an upper layer material on a first table operating as cathode;
• lowering an upper mold operating as anode onto the first table to press the upper layer material, emitting a high frequency wave for dielectric heating, to form a three-dimensionally formed body from the upper layer material by molding and fusion-cutting and temporarily holding the three-dimensionally formed body to the upper mold;
• stopping the high frequency dielectric heating;
• moving a second table carrying a lower layer material having a tacky bonding property to below the upper mold temporarily holding the three-dimensionally formed body;
• and
• lowering said upper mold onto the second table to press the three-dimensionally formed body cutting the lower layer material and tacky bonding the three-dimensionally formed body and the lower layer material, so that the lower layer material is not subjected to any high frequency dielectric heating, and is not heated,
• the apparatus comprising:
• said upper mold having a blade on the lower surface side,
• wherein the blade has spaced-apart, multiple blade edges configured for fusion-cutting the upper layer material at the time of high frequency dielectric heating between the upper mold and the first table;
• and cutting the lower layer material at the time of pressing between the upper mold and the second table;
• said upper mold being provided on a bottom surface thereof with a temporary holding means;
• a lower mold arranged on the second table, the lower mold having a flat top surface containing recessed sections formed alternately, the recessed sections each filled with a cushioning member;
• wherein the blade and the flat top surface are configured such that the blade edges are able to contact only that part of the flat top surface having no recessed sections, each of the recessed sections being transversally and inwardly separated from a position where the blade edge contacts with the flat top surface, by 0.2 mm to 1 mm;
• and
• said lower layer material is cut by said blade edge in direct contact with the flat top surface without cushion members.