US 11,654,661 B2
Composite thermoplastic film and the manufacturing method thereof
Chih-Yi Lin, Kaohsiung (TW); Kuo-Kuang Cheng, Kaohsiung (TW); Chi-Chin Chiang, Kaohsiung (TW); and Wen-Hsin Tai, Kaohsiung (TW)
Assigned to SAN FANG CHEMICAL INDUSTRY CO., LTD., Kaohsiung (TW)
Filed by SAN FANG CHEMICAL INDUSTRY CO., LTD., Kaohsiung (TW)
Filed on Mar. 7, 2022, as Appl. No. 17/688,039.
Claims priority of application No. 110124213 (TW), filed on Jul. 1, 2021.
Prior Publication US 2023/0001673 A1, Jan. 5, 2023
Int. Cl. B32B 27/08 (2006.01); B32B 27/32 (2006.01); B32B 27/40 (2006.01); B29C 48/08 (2019.01); B29C 48/21 (2019.01); B29C 48/00 (2019.01); B29K 75/00 (2006.01); B29K 23/00 (2006.01)
CPC B32B 27/08 (2013.01) [B29C 48/002 (2019.02); B29C 48/08 (2019.02); B29C 48/21 (2019.02); B32B 27/32 (2013.01); B32B 27/40 (2013.01); B29K 2023/00 (2013.01); B29K 2075/00 (2013.01); B32B 2250/24 (2013.01); B32B 2270/00 (2013.01); B32B 2307/536 (2013.01); B32B 2307/54 (2013.01); B32B 2307/5825 (2013.01); B32B 2307/732 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A manufacturing method of a composite thermoplastic film, comprising:
providing a first structural layer and a second structural layer;
performing a co-extrusion step to form a composite layer, wherein the co-extrusion step comprises:
performing the co-extrusion step with a first extruding machine, so the first structural layer is divided into a first thermal fuse film and a third thermal fuse film after passing through the first extruding machine; and
performing the co-extrusion step with a second extruding machine, so the second structural layer is formed a second thermal fuse film after passing through the second extruding machine and is formed between the first thermal fuse film and the third thermal fuse film, thereby the first thermal fuse film, the second thermal fuse film and the third thermal fuse film are formed as a composite layer; and
performing a film-forming step, wherein the composite layer is cooled to form a film through a forming wheel or a forming-embossing wheel, and controlling a rotating speed of the forming wheel or the forming-embossing wheel to obtain the composite thermoplastic film with a desired thickness.