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

Abstract

A method and an apparatus for producing a three-dimensional decoration piece that does not damage the tacky bonding or adhesion strength of the lower layer material of the decoration piece. The method includes putting an upper layer material on a first table operating as cathode; lowering an upper mold operating as anode onto the first table, emitting a high frequency wave for dielectric heating; 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; and lowering said upper mold onto the second table. In the apparatus, the second table or the lower mold is provided on the top surface thereof with recessed sections that are transversally and inwardly separated from a position where an edge of the first machining means contacts, by 0.2 mm to 1 mm; and a cushion member being arranged in the respective recessed sections.

What is claimed is: 
     
         1 . A method for producing a three-dimensional decoration piece of thermoplastic synthetic resin 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.   
     
     
         2 . The method according to  claim 1 , wherein
 an intermediate layer material is put on said first table   said upper layer material is put on the intermediate layer material; and   said upper mold is lowered onto the first table to press said upper layer material and said intermediate layer material and emitting a high frequency wave for dielectric heating, to form the three-dimensionally formed body by fusion bonding said upper layer material and said intermediate layer material.   
     
     
         3 . The method according to  claim 1 , wherein the lower layer material having a releasing paper arranged to a rear surface thereof is put on said second table. 
     
     
         4 . The method according to  claim 1 , wherein after the cutting of the lower layer material unnecessary parts thereof are removed, an application film is adhered onto the top surface of the upper layer. 
     
     
         5 . The method according to  claim 1 , wherein a cushion member is arranged under the lower layer material in regions located outside areas where the lower layer material is cut, to absorb the pressure of the upper mold by the cushion member. 
     
     
         6 . An apparatus configured to produce a three-dimensional decoration piece of thermoplastic synthetic resin according to the method of  claim 1 , the apparatus comprising:
 an upper mold operating as anode, a first table operating as cathode, and a second table,   said upper mold having a first machining means;   the first machining means fusion-cutting a material at the time of high frequency dielectric heating between the upper mold and the first table;   said first machining means cutting the 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;   said second table having a flat top surface;   said second table being provided on the top surface thereof with recessed sections, each of which being transversally and inwardly separated from a position where an edge of the first machining means contacts, by 0.2 mm to 1 mm; and   a cushion member being arranged in the respective recessed sections.   
     
     
         7 . An apparatus configured to produce a three-dimensional decoration piece of thermoplastic synthetic resin according to the method of  claim 1 , the apparatus comprising:
 an upper mold operating as anode, a first table operating as cathode, a second table, and a lower mold arranged on the second table;   said upper mold having a first machining means;   the first machining means fusion-cutting a material at the time of high frequency dielectric heating between the upper mold and the first table;   the first machining means cutting the 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;   said lower mold having a flat top surface;   said lower mold being provided on the top surface thereof with recessed sections, each of which being transversally and inwardly separated from a position where an edge of the first machining means contacts, by 0.2 mm to m 1 mm; and   a cushion member being arranged in the respective recessed sections.   
     
     
         8 . The method according to  claim 2 , wherein the lower layer material having a releasing paper arranged to a rear surface thereof is put on said second table. 
     
     
         9 . The method according to  claim 2 , wherein after the cutting of the lower layer material unnecessary parts thereof are removed, an application film is adhered onto the top surface of the upper layer. 
     
     
         10 . The method according to  claim 3 , wherein after the cutting of the lower layer material unnecessary parts thereof are removed, an application film is adhered onto the top surface of the upper layer. 
     
     
         11 . The method according to  claim 8 , wherein after the cutting of the lower layer material unnecessary parts thereof are removed, an application film is adhered onto the top surface of the upper layer. 
     
     
         12 . The method according to  claim 2 , wherein a cushion member is arranged under the lower layer material in regions located outside areas where the lower layer material is cut, to absorb the pressure of the upper mold by the cushion member. 
     
     
         13 . The method according to  claim 3 , wherein a cushion member is arranged under the lower layer material in regions located outside areas where the lower layer material is cut, to absorb the pressure of the upper mold by the cushion member. 
     
     
         14 . The method according to  claim 8 , wherein a cushion member is arranged under the lower layer material in regions located outside areas where the lower layer material is cut, to absorb the pressure of the upper mold by the cushion member.