Sanwa Kako Company Limited

Kazuyoshi Fujimura

Yoshio Miyano

Tomoyoshi Shibata

A method is disclosed that makes a open cell cellular body of polyethylene resin material in non-crosslinked structure, which has a maximum degree of cell interconnection, is good in recyclability and excellent in heat resistance or resistance to heat distortion. The method includes the steps of adding 4,4&prime;-oxy bis (benzene sulfonyl hydrazide) to a polyethylene resin material to form a foamable composition and shaping the foamable composition of polyethylene resin material, heating the shaped foamable composition of polyethylene resin material to be foamed under an atmospheric pressure to form a cellular body thereof with cells therein, and mechanically deforming the cellular body of polyethylene resin material to cause the cells therein to be interconnected, thereby producing the open cell cellular body desired. The produced continuous cellular body is rendered heat resistant by irradiating the same or the formed cellular body with a beam of electrons.

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Kyoto, Japan

Kazuyoshi Fujimura