Gusseted double-walled box formed of draped and blow molded parison
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United States of America Patent
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Feb 19, 1991
Issued Date -
N/A
app pub date -
Nov 15, 1989
filing date -
Dec 23, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A gusseted double-walled box is formed of a parison that is draped and blow molded according to the following process. 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. The resulting box has gussets formed on an internal wall to extend from the pinch-off line, as can be seen by cutting away the box bottom.
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