Method for producing foam blow-molded article
AssigneeJsp Corporation
InventorsMasahiro GOMIBUCHI, Toshio MORITA
Life of this patent
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Abstract
A method for producing a foamed blow-molded article, which includes extruding a physical blowing agent-containing foamable molten resin downwardly through a annular die to form a tubular foamed parison, clamping the foamed parison between split molds, and then blow molding it. At the latest before completion of the clamping of the foamed parison between the split molds, a gas is blown toward an inner peripheral surface of an upper portion of the foamed parison, the bottom portion of which has been closed, from a gas ejection outlet located within the foamed parison at a position immediately below the annular die to widen the foamed parison.
Claims8
1-5. (Canceled)
A method for producing a foamed blow-molded article, comprising the steps of:
- (a) extruding a physical blowing agent-containing foamable molten resin vertically downwardly through an annular die to form a tubular foamed parison, (b) closing a bottom portion of the foamed parison, (c) blowing a gas toward a whole inner peripheral surface of an upper portion of the foamed parison, the bottom portion of which has been closed, from a gas ejection outlet located within the foamed parison at a position immediately below the annular die to widen the foamed parison, (d) closing split molds to clamp the foamed parison therebetween, and (e) blow molding the foamed parison within the split molds, wherein step (c) is carried out at the latest before completion of step (d).
Dependencies are inferred from the claim text.