US 12,291,617 B2
Manufacturing method for a composite sheet
Sung Wan Jeon, Suwon-si (KR); Jung Mok You, Yongin-si (KR); and Kang Yun Lee, Suwon-si (KR)
Assigned to HYUNDAI MOTOR COMPANY, Seoul (KR); KIA CORPORATION, Seoul (KR); and UNIVERSITY-INDUSTRY COOPERATION GROUP OF KYUNG HEE UNIVERSITY, Yongin-si (KR)
Filed by HYUNDAI MOTOR COMPANY, Seoul (KR); KIA CORPORATION, Seoul (KR); and UNIVERSITY-INDUSTRY COOPERATION GROUP OF KYUNG HEE UNIVERSITY, Yongin-si (KR)
Filed on Nov. 22, 2022, as Appl. No. 17/992,402.
Claims priority of application No. 10-2022-0045078 (KR), filed on Apr. 12, 2022.
Prior Publication US 2023/0323056 A1, Oct. 12, 2023
Int. Cl. B29B 11/16 (2006.01); C08J 5/18 (2006.01); C08J 5/24 (2006.01); C08L 63/00 (2006.01); B29K 63/00 (2006.01); B29K 201/00 (2006.01)
CPC C08J 5/248 (2021.05) [B29B 11/16 (2013.01); C08J 5/18 (2013.01); C08L 63/00 (2013.01); B29K 2063/00 (2013.01); B29K 2201/08 (2013.01); C08J 2363/00 (2013.01); C08L 2203/16 (2013.01); C08L 2205/16 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A manufacturing method for a composite sheet, the method comprising:
obtaining a dispersion by mixing a cellulose nanofiber and glycerol;
obtaining a wet cake by drying the dispersion;
treating the wet cake with a solvent to obtain a treated wet cake;
obtaining a film by impregnating the treated wet cake with a composite resin comprising a thermosetting resin and a curing agent; and
obtaining the composite sheet by laminating, pressing, and curing the film,
wherein the wet cake is obtained by drying the dispersion for 40 hours to 60 hours in a chamber having a humidity in a range of 80% to 100%, and
wherein the wet cake is treated by substituting the glycerol with the solvent, and the glycerol is removed.