BLOW-MOLDING METHOD
    85.
    发明申请
    BLOW-MOLDING METHOD 审中-公开

    公开(公告)号:US20170341285A1

    公开(公告)日:2017-11-30

    申请号:US15539082

    申请日:2015-12-18

    申请人: Kyoraku Co., Ltd.

    发明人: Masaaki ONODERA

    摘要: Provided is a blow-molding method capable of suppressing generation of blister-like bubbles and producing a high quality hollow molded article when forming a thick hollow molded article by blow-molding. A blow-molding method includes setting a die-slit interval in a die head according to a target wall thickness of a hollow molded article to be molded, extruding a molten resin in an accumulator into a cylindrical shape from the die slit to form a parison, and molding the parison in a mold. The die-slit interval is made smaller than a value set according to the target wall thickness at start of extrusion, and then is increased to match the value set according to the target wall thickness. The value set according to the target wall thickness is preferably corrected considering wall thickness reduction due to drawdown. The wall thickness of the hollow molded article is preferably 3.5 mm or more.