Method for manufacture of window with extruded synthetic frame a

Details Method for manufacture of window with extruded synthetic frame a Method for manufacture of window with extruded synthetic frame a

1974-05-20

1978-05-02

Kucia, Richard R.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Plural sequential shaping or molding steps on same workpiece

264313, 264322, 264339, B29F 500

Patent

active

040875091

ABSTRACT:
Described is a method for bending rigid extruded theromoplastic-resin shapes without significant deformation of the cross-sectional configuration of the shape. The shape is intimately mated between first and second dies cooperatively configured to define the curvature to which the shape is to be bent. The shape, as mated with the dies, is heated by means of a heating fluid sufficiently to cause the thermoplastic material to lose a substantial portion of its tensile strength but insufficiently to cause the thermoplastic material to melt. Heating is continued as the dies are progressively moved into mating engagement with the extrusion over the extent of the shape to be bent. Thereafter, before the dies are moved apart, the bent shape is cooled sufficiently to restore rigidity to the shape.

REFERENCES:
patent: 174609 (1876-03-01), Wright
patent: 1847200 (1932-03-01), Vollmerhaus
patent: 1959488 (1934-05-01), Meyer
patent: 2571416 (1951-10-01), Brown
patent: 2868264 (1959-01-01), Jones
patent: 2964796 (1960-12-01), Press
patent: 3060503 (1962-10-01), Eckert
patent: 3184799 (1965-05-01), Southcott
patent: 3557277 (1971-01-01), Brodersen
patent: 3753635 (1973-08-01), Barnett

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