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

1996-05-21

1998-06-02

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

With internal application of fluid pressure

425130, B29C 4518, B29D 2400

Patent

active

057594791

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 at least one side mold cavity connected with this is filled with a pressurized flowable plastic melt and, simultaneously or after the setting in of the hardening of the walls in the main mold cavity, a pressurized fluid is introduced into the main mold cavity, as a result of which the flowable core in the main molded cavity is displaced while forming a flow front and, as soon as the flow front has reached the point of connection to the side mold cavity, a pressurized fluid is additionally introduced into the side mold cavity at the side opposite the point of connection such that the molten core in the side mold cavity is forced out together with the molten core in the main mold cavity.

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patent: 5401459 (1995-03-01), Nichols et al.
patent: 5423667 (1995-06-01), Jaroschek
patent: 5607640 (1997-03-01), Hendry
patent: 5612067 (1997-03-01), Kurihara et al.
Eyerer et al., "Spritzgiessen mit Gasinnendruck", Kunststoffe, 83, (Jul. 1993), pp. 505-517.

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