Mold for manufacturing a tube by extraction

Details Mold for manufacturing a tube by extraction Mold for manufacturing a tube by extraction

2007-02-01

2010-02-02

Davis, Robert B (Department: 1791)

Plastic article or earthenware shaping or treating: apparatus

With apparatus assembly or dismantling means or with idle part

For extrusion or injection type shaping means

C425S380000, C425S467000

Reexamination Certificate

active

07654811

ABSTRACT:
A mold equipped with a core having a plurality of branching columnar distal portions in the extrusion direction and a die having an aperture surrounding the distal portions. A softened flexible resin is injected from one end of a resin flow path formed between the core and the die and extruded in order to form a pipe material having a plurality of circular liquid flow paths which are mutually independent and have the same inner diameter. The distal portions of the core shaped as a row of circular distal portions aligned on the same axis, where the two edge distal portions have a smaller diameter than the distal portions disposed between the edge distal portions, while the portions of the aperture surrounding each of the distal portions have the same diameter.

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