Three-dimensional decorative piece and method of producing the same

A three-dimensional decorative piece comprising

• an upper layer molded body composed of an upper layer material with a metal vapor-deposited layer and formed into a three-dimensional shape having a convex portion on its front surface side through high-frequency dielectric heating,
• a core formed by curing a flowable synthetic resin filled in the convex portion of the upper layer molded body,
• a thermoplastic synthetic resin film bonded to a back surface side of the core by fusion, and
• a double-coated adhesive tape applied on a back surface side of the thermoplastic synthetic resin film.

A method of producing a three-dimensional decorative piece having a three-dimensional design, the method comprising:

• a step of molding a core, including filling a flowable synthetic resin into a core molding die engraved with the three-dimensional design and served as an electrode, subjecting the synthetic resin to high-frequency dielectric heating while being pressed from above with a flat plate die served as an electrode, and curing the synthetic resin to form the core having a shape with a convex portion corresponding to the three-dimensional design;
• a step of forming an upper layer molded body, including placing an upper layer material with a metal vapor-deposited layer between a concave die engraved with the three-dimensional design and served as an electrode and a convex die served as an electrode, subjecting the upper layer material to high-frequency dielectric heating while being pressed to form the upper layer molded body having a shape with a convex portion corresponding to the three-dimensional pattern on its front surface side;
• a step of placing a substrate on a flat plate die served as an electrode and then placing the core on the substrate;
• a step of integrating the upper layer molded body, the core, and the substrate, including positioning the flat plate die and the concave die opposed to each other while holding the upper layer molded body on the concave die, moving the concave die toward the flat plate die such that the convex portion of the upper layer molded body puts on the convex portion of the core, and subjecting the upper layer molded body, the core, and the substrate to high-frequency dielectric heating to bond the upper layer molded body, the core and the substrate all together by fusion;
• and
• a step of melt-cutting the upper layer molded body and the core along the three-dimensional design.

A method of producing a three-dimensional decorative piece having a three-dimensional design, the method comprising:

• a step of placing an upper layer material having a metal vapor-deposited layer on a substrate;
• a step of disposing the upper layer material and the substrate between a concave die engraved with the three-dimensional design and served as an upper electrode and a convex die served as a lower electrode, with the upper layer material opposed to the concave die;
• a step of integrating an upper layer molded body and the substrate, including subjecting the upper layer material and the substrate to high-frequency dielectric heating while being pressed to join the upper layer material and the substrate together by fusion and to form the upper layer material into the upper layer molded body, forming the upper layer molded body and the substrate to a shape having a convex portion corresponding to the three-dimensional design, and forming a concave portion on a back surface of the substrate side;
• a step of forming a core, including reversing the concave die, reversing the integrated upper molded die and substrate, positioning the reversed concave die as the lower electrode die, placing the reversed upper die and substrate on the reversed concave die, filling a flowable synthetic resin material into the concave portion of the substrate, subjecting the synthetic resin material to high-frequency dielectric heating while being pressed by a flat plate die and curing the synthetic resin material to form the core;
• a step of integrating the upper layer molded body, the substrate, and the core;
• and
• a step of melt-cutting the upper layer molded body along the three-dimensional design.

A method of producing a three-dimensional decorative piece having a three-dimensional design, the method comprising:

• a step of molding a core, including filling a flowable synthetic resin into a core molding die engraved with the three-dimensional design and served as an electrode, putting a thermoplastic synthetic resin film on the synthetic resin, subjecting the thermoplastic synthetic resin film and the synthetic resin to high-frequency dielectric heating while being pressed from above with a flat plate die served as an electrode, and curing the synthetic resin to form the core having a shape with a convex portion corresponding to the three-dimensional design and to join the core and the thermoplastic synthetic resin film by fusion;
• a step of forming an upper layer molded body, including placing an upper layer material having a metal vapor-deposited layer between a concave die engraved with the three-dimensional design and served as an electrode and a convex die served as an electrode, subjecting the upper layer material to high-frequency dielectric heating while being pressed to form the upper layer molded body having a shape with a convex portion corresponding to the three-dimensional pattern on its front surface side;
• a step of placing a double-coated adhesive tape having a releasable paper on a flat plate die served as an electrode with the releasable paper positioned on the flat plate die side and placing the core on the double-coated adhesive tape with the thermoplastic synthetic resin film positioned on the bottom side;
• a step of integrating the upper layer molded body and the core, including positioning the flat plate die and the concave die opposed to each other while holding the upper layer molded body on the concave die, moving the concave die toward the flat plate die such that the convex portion of the upper layer molded body puts on the convex portion of the core, and subjecting the upper layer molded body and the core to high-frequency dielectric heating to bond the upper layer molded body and the core together by fusion;
• and
• a step of melt-cutting the upper layer molded body along the three-dimensional design.