Method for producing a blow-molded body

Details Method for producing a blow-molded body Method for producing a blow-molded body

1988-09-09

1990-03-27

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264515, B29C 4920

Patent

active

049118781

ABSTRACT:
A method for manufacturing a blow-molded body employs a two-part blow-mold. A tubular preform is introduced, with the material in a thermoplastic state, into the opened blow-mold halves, and a reinforcing element is supported inside the preform by a displaceable holding device. During closing of the blow-mold halves, pressure is exerted on the wall regions of the preform that are adjacent to the reinforcing element. This pressure results in a reduced cross section of the preform wall in the region of the reinforcing element, and thermoplastic material is displaced. The interior of the preform is subjected to a blowing-pressure no later than when the pressure is applied from the exterior, and the blowing pressure causes the preform to inflate inside the mold. The displaced material anchors the reinforcing element inside the blow-molded body, and preferably forms bridges which extend across the blow-molded body and which cover the sides of the reinforcing element. The reinforcing element may also be provided with passages into which displaced material enters to form further bridges.

REFERENCES:
patent: 3281283 (1966-10-01), Ralph
patent: 3424623 (1969-01-01), Oakley et al.
patent: 3655849 (1972-04-01), Hayashi
patent: 3919373 (1975-11-01), Kormendi
patent: 3954369 (1976-05-01), Kormendi
patent: 4213933 (1980-07-01), Cambio
patent: 4511529 (1985-04-01), Fowles et al.

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