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Patent Searching and Data


Title:
PRODUCTION OF BLOW MOLDED PRODUCT
Document Type and Number:
Japanese Patent JPH08207127
Kind Code:
A
Abstract:

PURPOSE: To prevent that partially non-uniform tensile force is applied to the parison in a mold by integrally providing a coating layer of a thermoplastic resin of which the melt viscosity at blow molding temp. is specified on the outer wall of a preformed object composed of a thermoplastic resin and introducing the coated preformed object into a blow mold to blow air into the preformed object.

CONSTITUTION: The thermoplastic resin A charged in an accumulator 3 is extruded by a ring piston 4 and the extrudate passes through an annular passage 5 to reach a passage 8. Next, a thermoplastic resin B of which the melt viscosity at the blow molding temp. of the thermoplastic resin A is 300-2000P is extruded by an in-line extruder 6 to be passed through an annular passage 7 and the coating layer of the thermoplastic resin B is formed on and unified with the outer wall of the thermoplastic resin A to form a parison having a two- layered structure. Next, the two-layered parison is introduced into a pair of left and right opening and closing blow molds and air is blown into the hollow part of the parison while the coating layer composed of the thermoplastic resin B is brought into contact with the surfaces of the blow molds to expand the parison.


Inventors:
TSUJIMOTO NORITAKA
HARADA KOHEI
ISHIDA KEIICHI
Application Number:
JP1995000016733
Publication Date:
August 13, 1996
Filing Date:
February 03, 1995
Export Citation:
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Assignee:
SEKISUI CHEMICAL CO LTD
International Classes:
B29C49/02; B29C49/22; B29L22/00; (IPC1-7): B29C49/22; B29C49/02