| 摘要 |
PURPOSE:To yield a foamed crosslinked polyolefin resin molding having uniform and excellent qualities, by applying foaming and treating for providing foamability over again to crosslinked polyolefin resin particles and thermally foaming them in a mold. CONSTITUTION:A polyolefin resin such as polyethylene or ethylene/propylene copolymer is crosslinked by irradiation with electron rays or the addn. of org. radical generators. The resulting crosslinked polyolefin resin particles are formed until the expansion ratio of about 3-10 is attained and the resulting foamed material is treated for obtaining foamability in such a manner that the foamed material is compressed with air until 40-80% of the original volume is attained. Then, a granular foamed material is formed by foaming until the expansion ratio of about 14-40 based on the initial resin particles is attained and then the resulting material is treated for obtaining foamability again. Thereafter, by thermal molding of the resulting product in a mold, the titled granular foamed resin molding is yielded.
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