Molding apparatus for forming a parison and product of differing

Details Molding apparatus for forming a parison and product of differing Molding apparatus for forming a parison and product of differing

1988-09-15

1990-03-13

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

Extrusion shaping means

215 1C, 264541, 4251331, 425140, 425150, 425462, 425532, 428 346, 428 3691, 4285428, B29C 4706, B29C 4722, B29C 4792

Patent

active

049079573

ABSTRACT:
An 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. When blow molding is carried out by introducing a pressurized gas into the parison, the clump becomes integrated with the parison thereby providing a hollow 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.

REFERENCES:
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patent: 3752617 (1973-08-01), Burlis et al.
patent: 3901958 (1975-08-01), Doll
patent: 4093414 (1978-06-01), Swiatovy, Jr.
patent: 4149839 (1979-04-01), Iwawaki et al.
patent: 4239474 (1980-12-01), Nakagawa
patent: 4276250 (1981-06-01), Satchell et al.

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