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公开(公告)号：US20250162212A1
公开(公告)日：2025-05-22
申请号：US18840104
申请日：2023-03-10
Applicant: JSP CORPORATION
Inventor： Tomohiro MIURA , Kenta SASAKI
Abstract: A method for producing a molded article of thermoplastic resin expanded beads that includes cracking filling and in-mold molding. The expanded beads have a columnar shape and a defective portion that is a through hole and/or a groove. A ratio Ca/A of an average cross-sectional area Ca per defective portion to an average cross-sectional area A of a cut surface of the expanded bead obtained by cutting the expanded bead at a center in an axial direction along a plane perpendicular to the axial direction is 0.01 or more and 0.20 or less, and a ratio Ct/A of a total cross-sectional area Ct of the defective portion to the average cross-sectional area A of the expanded bead is 0.02 or more and 0.20 or less. When the mold is completely closed, a filling rate F of the expanded beads is 125% or more and 220% or less.
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公开(公告)号：US20250162206A1
公开(公告)日：2025-05-22
申请号：US18841513
申请日：2023-03-10
Applicant: JSP CORPORATION
Inventor： Tomohiro MIURA , Kenta SASAKI
Abstract: A method for producing a molded article of thermoplastic resin expanded beads includes a cracking filling step and an in-mold molding step. Expanded beads to be used in the cracking filling step each have a columnar shape and each have one or more defective portions of one or two kinds, the defective portions being selected from the group consisting of through holes and grooves. A molding cavity of a mold has a first portion having a length in an opening/closing direction of the mold greater than an average length LA and a second portion shorter than the average length LA. In the cracking filling step, a difference P2max−P1min between a minimum value P1min of the compression rate of the first portion and a maximum value P2max of the compression rate of the second portion is 5% or more and 100% or less.
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