Process of and an apparatus for injection molding hollow-blown p

Details Process of and an apparatus for injection molding hollow-blown p Process of and an apparatus for injection molding hollow-blown p

1996-05-22

1998-11-17

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

With internal application of fluid pressure

B29C 4500

Patent

active

058371869

ABSTRACT:
The invention relates to a process of and an apparatus for injection molding hollow-blown plastic bodies in which a mold cavity formed by a tool and consisting of at least one main mold cavity and one side mold cavity is filled with a pressurized flowable plastic melt and, after the setting in of the hardening of the plastic melt at the walls of the mold cavity, a pressurized fluid is introduced into the main mold cavity, and, with this, the flowable core of the plastic melt is forced out of this main mold cavity, and subsequently, a pressurized fluid is introduced into the side mold cavity by means of which the flowable core of the plastic melt is forced out of the side mold cavity into the main mold cavity, where the material still capable of flowing is deposited on the already hardened walls in the main mold cavity.

REFERENCES:
patent: 3873656 (1975-03-01), Garner
patent: 5069858 (1991-12-01), Hendry
patent: 5204050 (1993-04-01), Loren
patent: 5423667 (1995-06-01), Jaroschek
patent: 5607640 (1997-03-01), Hendry
patent: 5612067 (1997-03-01), Kurihara et al.
Eyerer, et al, "Spritzgie.beta.en mit Gasinnendruck", Kunststoffe, 83, (Jul. 1993), pp. 505-517.
"Spritzgie.beta.en mit Gasinnendruck," P. Eyerer, R. Martins, Stuttgart and E. Burkle, in the journal Kunststoffe, Carl Hansa Verlag, Munich 1993.

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