Three-dimensional decorative piece made of thermoplastic synthetic resin and method for producing the same

Abstract

A three-dimensional decorative piece made of a thermoplastic synthetic resin is produced by subjecting, to high-frequency dielectric heating, a decorative piece material that includes an upper layer that includes a thermoplastic synthetic resin film having a vapor-deposited metal layer, an intermediate layer that includes a thermoplastic synthetic resin sheet, and a lower layer that includes a thermal bonding film, the decorative piece including: a first printing layer printed using a transparent color ink, a matte ink, or a glossy ink, as an upper surface of the upper layer; and a second printing layer in which a fine line is printed using a transparent UV ink, on an upper surface of the first printing layer. It is desirable that the fine line of the second printing layer has a width of 0.1 mm to 0.25 mm.

1 .- 5 . (canceled) 
     
     
         6 . A three-dimensional decorative piece made of a thermoplastic synthetic resin that is produced by subjecting, to high-frequency dielectric heating, a decorative piece material that includes an upper layer constituted by a thermoplastic synthetic resin film having a vapor-deposited metal layer, an intermediate layer constituted by a thermoplastic synthetic resin sheet, and a lower layer constituted by a thermal bonding film,
 the decorative piece comprising:   a first printing layer printed using a transparent color ink, a matte ink, or a glossy ink, as an upper surface of the upper layer; and   a second printing layer in which a fine line is printed using a transparent UV ink, on an upper surface of the first printing layer.   
     
     
         7 . The three-dimensional decorative piece made of a thermoplastic synthetic resin according to  claim 6 ,
 wherein the fine line of the second printing layer has a width of 0.1 mm to 0.25 mm.   
     
     
         8 . The three-dimensional decorative piece made of a thermoplastic synthetic resin according to  claim 6 ,
 wherein the upper layer has a protruding portion formed through shaping, and   the fine line of the second printing layer is printed to intersect an edge portion of the protruding portion.   
     
     
         9 . The three-dimensional decorative piece made of a thermoplastic synthetic resin according to  claim 7 ,
 wherein the upper layer has a protruding portion formed through shaping, and   the fine line of the second printing layer is printed to intersect an edge portion of the protruding portion.   
     
     
         10 . The three-dimensional decorative piece made of a thermoplastic synthetic resin according to  claim 6 ,
 wherein the upper layer includes a migration prevention film layer.   
     
     
         11 . The three-dimensional decorative piece made of a thermoplastic synthetic resin according to  claim 7 ,
 wherein the upper layer includes a migration prevention film layer.   
     
     
         12 . The three-dimensional decorative piece made of a thermoplastic synthetic resin according to  claim 8 ,
 wherein the upper layer includes a migration prevention film layer.   
     
     
         13 . The three-dimensional decorative piece made of a thermoplastic synthetic resin according to  claim 9 ,
 wherein the upper layer includes a migration prevention film layer.   
     
     
         14 . A method for producing a three-dimensional decorative piece made of a thermoplastic synthetic resin by subjecting, to high-frequency dielectric heating, a decorative piece material that includes an upper layer that is constituted by a thermoplastic synthetic resin film having a vapor-deposited metal layer, has an outline, and is provided with a three-dimensional design, an intermediate layer constituted by a thermoplastic synthetic resin sheet, and a lower layer constituted by a thermal bonding film,
 wherein the upper layer is formed through   a step of forming a first printing layer in the upper layer by screen printing a transparent color ink, a matte ink, or a glossy ink onto an upper surface of the thermoplastic synthetic resin film,   a step of forming a second printing layer in the upper layer by screen printing a fine line using a transparent UV ink onto an upper surface of the first printing layer,   a step of curing the second printing layer by irradiating the second printing layer with ultraviolet rays, and   a step of attaching an adhesive carrier film to an upper surface of the second printing layer,   the method comprising:   a step of placing the decorative piece material in which the lower layer, the intermediate layer, and the upper layer are placed on each other in the stated order, on a table serving as one electrode in high-frequency dielectric heating;   a first high-frequency dielectric heating step of shaping the three-dimensional design in the upper layer by pressing an engraved die serving as another electrode in high-frequency dielectric heating against the upper layer of the decorative piece material and performing high-frequency dielectric heating, and fusion-cutting the decorative piece material other than the carrier film along the outline and fusing the upper layer and the intermediate layer to weld the resulting layer to the lower layer;   an elimination step of eliminating an unnecessary portion that does not constitute the three-dimensional design of the fusion-cut decorative piece material to obtain a decorative piece material;   a second high-frequency dielectric heating step of welding a base material and the decorative piece material by fitting the decorative piece material into the engraved die placed on the table with an engraved surface facing upward such that the lower layer faces upward, placing the base material on the decorative piece material, pressing the base material against the decorative piece material using a flat-plate die from above the base material, and performing high-frequency dielectric heating; and   an adjustment step of removing, from the engraved die, the decorative piece material and the base material that are welded to each other, peeling off the carrier film, and cutting the base material to a desired shape to obtain a three-dimensional decorative piece made of a thermoplastic resin.