Process and apparatus for producing curved hollow bodies of ther

Details Process and apparatus for producing curved hollow bodies of ther Process and apparatus for producing curved hollow bodies of ther

1998-06-23

2000-10-10

Davis, Robert

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including application of internal fluid pressure to hollow...

264542, 425532, 425534, B29C 3108, B29C 4904

Patent

active

061298859

ABSTRACT:
In a process and apparatus for producing elongate curved hollow bodies at least partially comprising thermoplastic material a preform is extruded from an extrusion system head and engaged by a gripping means. The preform is moved by the gripping means into the region of a guide stencil disposed above the mold cavity of a mold portion of a divided blow molding mold and introduced into the mold cavity by a simultaneous downward movement of the gripping means and a movement following the configuration of the guide stencil. The guide stencil has two mutually opposite walls, the spacing of which increases in an upward direction and the spacing of which at the bottom of the guide stencil approximately corresponds to the maximum width of the mold cavity. The preform is thus guided towards the mold cavity by the walls, acquiring its definitive orientation with respect thereto by virtue of such guidance, passing through a lower opening in the guide stencil into the mold cavity. The mold is closed and the preform expanded therein by an increased internal pressure in the preform.

REFERENCES:
patent: 5030083 (1991-07-01), Kohno et al.
patent: 5264178 (1993-11-01), Yamamura et al.
patent: 5464635 (1995-11-01), Geiger
patent: 5589205 (1996-12-01), Ishikawa et al.
patent: 5662842 (1997-09-01), Sadr et al.
patent: 5695711 (1997-12-01), Geiger
patent: 5792490 (1998-08-01), Geiger
patent: 5814269 (1998-09-01), Geiger

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