Extrusion blow molding an automotive boot

Details Extrusion blow molding an automotive boot Extrusion blow molding an automotive boot

1992-12-21

1994-06-07

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Corrugating

264529, 264533, 425525, 425535, B29C 4904, B29C 4918

Patent

active

053187407

ABSTRACT:
In general, it is difficult to mold properly sized automotive boots without flash to be removed from the top end thereof. In accordance with the present invention, such molding is achieved placing a tubular parison between a pair of mold halves, moving a blow pin assembly downwardly partly into the top end of the parison, closing the mold by moving the mold halves together, using fingers to stretch the open bottom end of the parison, moving a sizing mandrel into the bottom end of the parison, closing inserts on the bottom of the mold around the bottom end of the parison to size the latter, blowing the parison using air under pressure discharged from the blow pin, moving the blow pin assembly farther down into the parison to size and cut the top end of the parison, opening the inserts and removing the lower sizing mandrel, opening the mold, closing the stretching fingers, and removing the blow pin assembly from the boot, which is stripped from the mold.

REFERENCES:
patent: 3271489 (1966-09-01), Fogelberg et al.
patent: 3371376 (1968-03-01), Fischer et al.
patent: 3410937 (1968-11-01), Winchester
patent: 4049762 (1977-09-01), Martino et al.
patent: 4334852 (1982-06-01), Haubert
patent: 4396574 (1983-08-01), Kovacs
patent: 4442063 (1984-04-01), Younkin et al.
patent: 4518558 (1985-05-01), Anway et al.
patent: 5112561 (1992-05-01), Dickinson

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