US 12,459,171 B2
Physical foaming process using foaming press
Seong Soo Bae, Daejeon (KR); Chul Ee Kang, Daejeon (KR); Sang Jin Lee, Daejeon (KR); and Jae Hyeok Lee, Daejeon (KR)
Assigned to HANWHA SOLUTIONS CORPORATION, Seoul (KR)
Appl. No. 17/784,149
Filed by HANWHA SOLUTIONS CORPORATION, Seoul (KR)
PCT Filed Oct. 30, 2020, PCT No. PCT/KR2020/015086
§ 371(c)(1), (2) Date Jun. 10, 2022,
PCT Pub. No. WO2021/118060, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 10-2019-0164422 (KR), filed on Dec. 11, 2019.
Prior Publication US 2023/0031181 A1, Feb. 2, 2023
Int. Cl. B29C 44/42 (2006.01); B29C 44/34 (2006.01); C08J 9/00 (2006.01); B29K 23/00 (2006.01)
CPC B29C 44/42 (2013.01) [B29C 44/3403 (2013.01); C08J 9/0028 (2013.01); B29K 2023/083 (2013.01); C08J 2203/06 (2013.01); C08J 2203/08 (2013.01); C08J 2323/08 (2013.01); C08J 2331/04 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A physical foaming process of preparing a foam by using a foaming press provided with a cavity, the physical foaming process comprising:
an injecting step of injecting a foaming compounding resin into the cavity;
a closing step of closing the cavity by using the foaming press;
a gas injecting step of injecting gas into the cavity;
an atmospheric pressure maintaining step of dissolving the gas in the foaming compounding resin by maintaining the inside of the cavity at a constant pressure;
a rapid-opening and demolding step, simultaneously performed in a single action, of (i) rapidly opening the cavity at a speed sufficient to cause an abrupt pressure drop inside the cavity to perform foaming and (ii) removing the foam molded in the form of a chamber,
wherein a temperature inside the cavity is 90 to 180° C.