Expanded bead and method for producing the same
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United States of America
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Mar 4, 2025
Grant Date -
Aug 25, 2022
app pub date -
Feb 3, 2022
filing date -
Feb 3, 2022
priority date (Note) -
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status (Latency Note)
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Abstract
An expanded bead having a tubular shape with a through hole and a method for producing the same are provided. The expanded bead includes a foamed core layer and a covering layer. A polyolefin-based resin included in the covering layer has a melting point lower than a melting point of a polypropylene-based resin included in the foamed core layer. An average hole diameter d of the through hole of the expanded bead is less than 1 mm, and a ratio d/D of the average hole diameter d to an average outer diameter D of the expanded bead is 0.4 or less. The polypropylene-based resin for the foamed core layer has a flexural modulus of 1,200 MPa or more and a melting point of 158° C. or lower.
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