Pipes and tubular conduits – Flexible – Corrugated
Patent
1993-11-24
1997-08-05
Scherbel, David
Pipes and tubular conduits
Flexible
Corrugated
138120, 138137, 138155, F16L 1111
Patent
active
056532652
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. 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:
patent: 874938 (1907-12-01), Cazin
patent: 2779976 (1957-02-01), Roberts et al.
patent: 3029471 (1962-04-01), Adams et al.
patent: 3093861 (1963-06-01), Rex
patent: 3257482 (1966-06-01), Schechter
patent: 3369272 (1968-02-01), Martin et al.
patent: 3409710 (1968-11-01), Klygis
patent: 3457337 (1969-07-01), Turner
patent: 3752617 (1973-08-01), Burlis et al.
patent: 3901958 (1975-08-01), Doll
patent: 4026983 (1977-05-01), Stockwell
patent: 4056344 (1977-11-01), Lemelson
patent: 4093414 (1978-06-01), Swiatovy, Jr.
patent: 4125585 (1978-11-01), Rosenbaum
patent: 4149839 (1979-04-01), Iwawaki et al.
patent: 4239474 (1980-12-01), Nakagawa
patent: 4276250 (1981-06-01), Satchell et al.
patent: 4353859 (1982-10-01), Palmer
patent: 4383555 (1983-05-01), Finley
patent: 4507258 (1985-03-01), Aoki
patent: 4659531 (1987-04-01), Ezaki
patent: 4662404 (1987-05-01), LeVeen et al.
patent: 5560398 (1996-10-01), Pfleger
"Blow Molding", edited by Shinsuke Yoshikawa, published by Plastic Age, 1970, p. 40.
"Japan Plastics", Development of a New Multi-Layered Blow Molding Apparatus-Intermittent Extrusion Type Multi-Layer Blow Molding Method by Akira Iwawaki Kinshiro Kojima and Yoshiharu Shidara, vol. 27, No. 12, 1976 .
Ezaki Yasuo
Nakagawa Tatsuya
Excell Corporation
Hook James F.
Scherbel David
LandOfFree
Hollow plastic product does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hollow plastic product, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hollow plastic product will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1068277