Method for injection molding a large thickness flange at end of

Details Method for injection molding a large thickness flange at end of Method for injection molding a large thickness flange at end of

1992-06-29

1993-11-30

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264276, 264277, 264278, 264279, 264515, 425525, B29C 4514, B29C 4920

Patent

active

052662624

ABSTRACT:
A method for forming a large thickness flange at an end of a blow molding tube by injection molding using a die assembly. The blow molding tube is sufficiently cooled down before insertion into injection molding dies. The sizes and dimensions of tube holding portions of the injection molding die assembly, which hold the blow molding tube at a portion adjacent to the end, and those of a mating injection molding mandrel are set in conformity to its size and dimension of the blow molding tube after thermal shrinkage thereof caused by cooling of the tube. Thus, any gap between the blow molding tube and injection molding die assembly is eliminated, so that any leakage of molten resin through such a gap between the contact surfaces of the blow molding tube and those of the injection molding dies and mandrel can be perfectly prevented during the injection molding step. For instance, the method is useful for producing an intake manifold used in an automotive engine room.

REFERENCES:
patent: 4510013 (1985-04-01), Lupke et al.
patent: 4724111 (1988-02-01), Iwata et al.
patent: 5049224 (1991-09-01), Umezawa et al.
patent: 5089208 (1992-02-01), Nakamura et al.

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