Method and apparatus for gusseted parison draping

Details Method and apparatus for gusseted parison draping Method and apparatus for gusseted parison draping

1988-12-23

1990-02-06

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264529, 264531, 264536, 264540, 425525, 425531, 425532, 425535, B29C 4904, B29C 4930, B29C 4950

Patent

active

048987077

ABSTRACT:
A blow molding parison (10) being draped around a generally rectangular mold part (12) is spread from its extruded cylindrical shape into a generally rectangular shape (14), as it descends from an extrusion head (11). Before the open bottom (20) of the parison reaches a clamp (25) on the mold part, a jet of air is blown downward through the open bottom to draw in the parison's side and end regions (21 and 22 respectively). This reduces the size of parison (10) and helps it fit within the clamp and also forms the end regions (22) of the parison into a pair of opposed pleats (23) extending inward from the ends of the pinch-off line when clamp (25) closes. Further descending of the parison unfolds the pleats into gussets (24) extending toward corner regions (27) of mold part (12) so that the parison can drape around the mold part corners.

REFERENCES:
patent: 2720680 (1955-10-01), Gerow
patent: 3663522 (1972-05-01), Butcher
patent: 3821343 (1974-06-01), Sudo
patent: 3897530 (1975-07-01), Leathers
patent: 4770839 (1988-09-01), Legge

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