US 11,981,114 B2
Method of manufacturing sandwich panel and sandwich panel
Masao Uesaka, Tokyo (JP)
Assigned to SUMITOMO BAKELITE CO., LTD., Tokyo (JP)
Appl. No. 18/025,705
Filed by SUMITOMO BAKELITE CO., LTD., Tokyo (JP)
PCT Filed Jul. 9, 2021, PCT No. PCT/JP2021/025960
§ 371(c)(1), (2) Date Mar. 10, 2023,
PCT Pub. No. WO2022/054388, PCT Pub. Date Mar. 17, 2022.
Claims priority of application No. 2020-153525 (JP), filed on Sep. 14, 2020.
Prior Publication US 2023/0256724 A1, Aug. 17, 2023
Int. Cl. B32B 3/12 (2006.01); B29C 37/00 (2006.01); B32B 5/02 (2006.01); B32B 5/26 (2006.01); B32B 7/12 (2006.01); B32B 27/12 (2006.01); B32B 27/30 (2006.01); B32B 27/32 (2006.01); B32B 27/34 (2006.01); B32B 27/36 (2006.01); B32B 37/12 (2006.01)
CPC B32B 37/1207 (2013.01) [B29C 37/0075 (2013.01); B32B 3/12 (2013.01); B32B 5/022 (2013.01); B32B 5/024 (2013.01); B32B 5/26 (2013.01); B32B 7/12 (2013.01); B32B 27/12 (2013.01); B32B 27/302 (2013.01); B32B 27/32 (2013.01); B32B 27/34 (2013.01); B32B 27/36 (2013.01); B32B 2037/1223 (2013.01); B32B 2250/05 (2013.01); B32B 2260/023 (2013.01); B32B 2260/046 (2013.01); B32B 2262/0269 (2013.01); B32B 2262/101 (2013.01); B32B 2305/024 (2013.01); B32B 2305/188 (2013.01); B32B 2307/54 (2013.01); B32B 2307/7376 (2023.05); B32B 2307/748 (2013.01); B32B 2309/02 (2013.01); B32B 2309/12 (2013.01); B32B 2323/10 (2013.01); B32B 2355/00 (2013.01); B32B 2367/00 (2013.01); B32B 2377/00 (2013.01); B32B 2605/18 (2013.01); B32B 2607/00 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method of manufacturing a sandwich panel comprising:
preparing prepregs, each of the prepregs having a sheet shape;
preparing first laminates, each of the first laminates comprising at least two sheets of the prepregs stacked each other, and a release film provided on each of an upper surface and a lower surface of the prepregs stacked;
applying a first heating and pressurization process to each of the first laminates through the release film to cure the prepregs included in each of the first laminates, followed by removing the release film, thereby obtaining composite facing materials;
providing a core layer having a honeycomb structure;
disposing one of the composite facing materials on an upper surface side of the core layer, and another of the composite facing materials on a lower surface side of the core layer, thereby obtaining a second laminate; and
applying a second heating and pressurization process to the second laminate to integrate said one, the core layer and said another in this order, thereby obtaining the sandwich panel,
wherein a pressure of the first heating and pressurization process is higher than or equal to a pressure of the second heating and pressurization process, and
wherein the release film includes a resin selected from the group consisting of a polyethylene terephthalate resin (PET), a polybutylene terephthalate resin (PBT), a polytrimethylene terephthalate resin (PTT), and a polyhexamethylene terephthalate resin (PHT), a poly(4-methyl-1-pentene) resin (TPX), a syndiotactic polystyrene resin (SPS), and combinations thereof.