Method of manufacturing foam molded article
AssigneeKyoraku Co., Ltd.
InventorsMasaaki Onodera, Yoshinori Ono, Yu Igarashi
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Abstract
A method of manufacturing a foam molded article is disclosed. The method includes the steps of forming a foam parison by extruding a molten, kneaded resin containing a foaming agent through an annular slit in an extrusion direction in which a molding region between a pair of split molds lies, and molding a foam molded article by closing the split molds with respect to the foam parison located in the molding region. The parison formation step includes performing pre-blowing by injecting air toward an inner surface of the foam parison in a direction which forms an angle of 45° or more and 135° or less with the extrusion direction.
Claims1
A method of manufacturing a foam molded article, comprising:
- a parison formation step of forming a foam parison by extruding a molten, kneaded resin containing a foaming agent through an annular slit in an extrusion direction in which a molding region between a pair of split molds lies, and
- a molding step of molding a foam molded article by closing the split molds with respect to the foam parison located in the molding region, wherein
- the parison formation step includes performing pre-blowing by injecting air toward an inner surface of the foam parison in a direction which forms an angle of 45° or more and 135° or less with the extrusion direction, and
- wherein, in the parison formation step, the foam parison is pinched between pinchers and sealed before a lower end of the foam parison reaches a lower end of the molding region, and the pre-blowing is performed while lowering the pinchers as the lower end of the foam parison is lowered.
Dependencies are inferred from the claim text.