Extrusion molding apparatus and method of forming a parison

Details Extrusion molding apparatus and method of forming a parison Extrusion molding apparatus and method of forming a parison

1996-12-27

1998-07-28

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264 405, 264541, 26417126, 425132, 425381, 425465, 425466, 425523, 425532, B29C 4904

Patent

active

057859205

ABSTRACT:
A rod 3 is driven forward to open an annular slit 5 between a die 2 and a mandrel 4 and the molten resin in a resin accumulation chamber 10 is expelled from annular slit 5 to form a parison. In this operation, the die 2 is displaced from an original position adjoining to the mandrel 4 (axially aligned position) upon opening of the annular slit 5 to correct for any variation in thickness of parison P to be extruded from the annular slit 5. Then, the molten resin accumulated in accumulation chamber 10 is expelled from annular slit 5 to form parison P. The die 2 is then reset to the original position to bring the die 2 and mandrel 4 into axial alignment. Therefore, as the rod 3 is driven back, the annular slit 5 can be closed tight by the mandrel 4 to prevent resin leakage. After closure of the annular slit 5, molten resin is accumulated again in the accumulation chamber 10 and the annular slit 5 is opened. This procedure is repeated to produce parisons on an intermittent basis.

REFERENCES:
patent: 4149839 (1979-04-01), Iwawaki et al.
patent: 4472129 (1984-09-01), Siard
patent: 5156857 (1992-10-01), Wang et al.
Japanese Patent Application Laid-Open No. 134758/1976.
Japanese Patent Publication No. 5286/1991.
Japanese Patent Publication No. 37026/1977.
Japanese Patent Publication No. 53175/1982.

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