公开(公告)号：EP4406997A1

公开(公告)日：2024-07-31

申请号：EP22892384.3

申请日：2022-09-01

申请人： JSP Corporation

发明人： SASAKI Kenta

IPC分类号： C08J9/228 ,  B29C44/00 ,  B29C44/44 ,  B29K23/00

CPC分类号： B29C44/44 ,  B29C44/00 ,  C08J9/228

摘要： In a method for manufacturing a molded article of polypropylene-based resin expanded beads, expanded beads (1) compressed by pressurized gas are filled in a mold, and then a heating medium is supplied into the mold to perform in-mold molding on the expanded beads (1) in the mold. The expanded bead (1) has a tubular shape with a through-hole (11). An average hole diameter d of the through-hole (11) is 0.1 mm or more and less than 1 mm, and a ratio d/D of the average hole diameter d of the through-hole (11) to an average outer diameter D of the expanded bead (1) is 0.4 or less. A compression ratio P of the expanded beads (1) in a state where the expanded beads (1) are filled in the mold is 20% or more and 80% or less.