Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1974-02-04
1976-08-31
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
229 25EC, 264 53, 264177R, 264209, 264210R, 264296, 264321, 264DIG66, 428159, B29C 1703, B29D 2700, B29F 304
Patent
active
039781828
ABSTRACT:
A thermoplastic foamed resin extruding operation is described which uses an inner die lip machined to vary the width of the die annulus or opening so that varying thicknesses or mass concentrations or densities of preselected desired width will be formed in the extruded resin sheet obtained therefrom. The mass concentration variations in the extruded sheet are coordinated with a downstream thermoforming operation involving deep and shallow draw forming or different sheet fabrications such as folding, scoring, cutting, etc.
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Anderson Philip
Huggett Charles A.
Mobil Oil Corporation
Tierney James D.
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