US 11,738,592 B2
Method for producing a strip of three-dimensional decorative piece made of thermoplastic synthetic resin and apparatus for producing the same
Eiji Kuwahara, Osaka (JP)
Assigned to Takeshi Kuroda, Osaka (JP)
Appl. No. 17/436,038
Filed by Takeshi Kuroda, Osaka (JP)
PCT Filed Mar. 26, 2019, PCT No. PCT/JP2019/012791
§ 371(c)(1), (2) Date Sep. 2, 2021,
PCT Pub. No. WO2020/194496, PCT Pub. Date Oct. 1, 2020.
Prior Publication US 2022/0169066 A1, Jun. 2, 2022
Int. Cl. B44B 5/00 (2006.01); B44B 5/02 (2006.01); B44C 1/24 (2006.01)
CPC B44B 5/008 (2013.01) [B44B 5/0009 (2013.01); B44B 5/009 (2013.01); B44B 5/028 (2013.01); B44C 1/24 (2013.01); B44B 2700/00 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for producing a strip of three-dimensional decorative piece of thermoplastic synthetic resin, the method comprising:
a step of feeding 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 fusion-cut by the heat of a high frequency;
a step of preheating the decorative strip material to soften the strip material with heat, wherein the preheating step comprises softening the decorative strip material between an upper heating roll and a lower heating roll that are arranged facing each other vertically and are configured to rotate synchronously with each other;
a step of shaping the decorative strip material into a strip of three-dimensional decorative piece by continuously oscillating a high-frequency in between a rotatable upper electrode roll die and a rotatable lower electrode roll die and applying high-frequency dielectric heat to the decorative strip material between the upper and lower electrode roll dies;
a step of cooling the shaped strip of three-dimensional decorative piece; and
a step of winding up the cooled strip of three-dimensional decorative piece.