In-mold particle forming method for formed polyolefin synthetic resin particle

Abstract

PURPOSE:To speed up the filling of particles into a mold, to increase the filling quantity, and to facilitate even filling into a complicate mold by keeping the mold at reduced pressure, pressurizing a particle container tank to a pressure above the atmospheric, and opening a valve. CONSTITUTION:When foamable particles are filled into a mold which has a small hole and can be closed but cannot be sealed, use is made of an in-mold foaming forming device comprising a mold connected with a particle container tank by a filling hose fitted with a valve. Keeping the mold at a reduced pressure and pressurizing the tnak to a pressure above the atmospheric and below 3 kg/cm<2>, the valve is opened so as to feed the particles into the mold rapidly, to increase the filling quantity, and to facilitate the filling into a complicate mold. Then heat is applied so as to allow the particles to foam and to fuse the particles together, to produce a foamed body which is in the proper shape and has reduced contraction.

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Cited By (4)

    Publication numberPublication dateAssigneeTitle
    JP-H01156338-AJune 19, 1989Kanegafuchi Chem Ind Co LtdPrefoamed polypropylene resin particle and production thereof
    JP-H01263033-AOctober 19, 1989Kanegafuchi Chem Ind Co Ltd, Toyo Mach & Metal Co LtdFoam molding method for thermoplastic synthetic resin block
    JP-H0757498-B2June 21, 1995三菱化学ビーエーエスエフ株式会社オレフイン系樹脂発泡粒子の型内成形法
    JP-S634940-AJanuary 09, 1988Mitsubishi Yuka Badische Co LtdMethod for molding olefinic resin foamed particles in mold