Hollow plastic product

Details Hollow plastic product Hollow plastic product

1998-09-02

2000-09-19

Hook, James

Pipes and tubular conduits

Flexible

Corrugated

138137, 138155, F16L 1111

Patent

active

061197319

ABSTRACT:
A method and apparatus for manufacturing a hollow plastic product is provided. In accordance with one aspect, into a mold half having a tubular groove portion and a projecting groove portion which projects outwardly from the tubular groove section is supplied a parison into the tubular groove portion and a clump of molding material into the projecting groove portion, and when blow molding is carried out by introducing a pressurized gas into the parison, the clump becomes integrated with the parison thereby providing a plastic product of unitary structure. In accordance with another aspect of the present invention, a parison extrusion nozzle is provided with at least two passages each of which is connected, preferably through a valve, to a corresponding dispensing unit for dispensing a desired molding material. A control unit is provided as connected to each of the dispensing units to control the supply of molding material so that there is obtained a parison having regions of different molding materials.

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Japan Plastics, vol. 27, No. 12, Dec. 1976, pp. 35-44.

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