Method for producing a strip of three-dimensional decorative piece made of thermoplastic synthetic resin and apparatus for producing the same

An apparatus for producing a strip of three-dimensional decorative piece of thermoplastic synthetic resin, the apparatus comprising:

• a feeding mechanism configured to feed a decorative strip material having three layers of a lower layer, an upper layer on the lower layer, and a protective retention layer on the upper layer, wherein the lower layer is a sheet of thermoplastic synthetic resin, the upper layer is a film of thermoplastic synthetic resin, and the protective retention layer is not to be fusion-cut by the heat of a high frequency;
• a preheating mechanism provided on a downstream side of the feeding mechanism and configured to soften the decorative strip material with heat, wherein the preheating mechanism comprises an upper heating roll and a lower heating roll that are arranged facing each other vertically and configured to rotate synchronously with each other;
• a shaping mechanism provided on a downstream side of the preheating mechanism,
• wherein the shaping mechanism comprises a rotatable upper electrode roll die and a rotatable lower electrode roll die capable of contact with the upper electrode roll die,
• the shaping mechanism being configured to shape the decorative strip material into a strip of three-dimensional decorative piece by continuously oscillating a high-frequency in between the rotatable upper electrode roll die and the rotatable lower electrode roll die and applying high-frequency dielectric heat to the heat-softened decorative strip material between the upper and lower electrode roll dies;
• a cooling mechanism provided on a downstream side of the shaping mechanism and configured to cool the shaped strip of three-dimensional decorative piece;
• and
• a winding mechanism provided on a downstream side of the cooling mechanism and configured to wind up the cooled strip of three-dimensional decorative piece.