Process for locally flattening an oriented corrugated sheet and

Details Process for locally flattening an oriented corrugated sheet and Process for locally flattening an oriented corrugated sheet and

1975-01-06

1976-10-05

Kucia, Richard R.

Plastic and nonmetallic article shaping or treating: processes

Utilizing heat releasable stress to reshape solid workpiece

264295, 264339, B29C 1702

Patent

active

039845176

ABSTRACT:
The invention concerns a process for locally flattening an oriented corrugated thermoplastic sheet in order to produce finishing pieces such as ridge pieces and other roofing finishing components. According to this process, the sheet is locally heated in the regions in which it is to be flattened, to a temperature between the vitreous transition temperature and the plastic deformation temperature of the thermoplastic material of which it is composed, and subsequently cooled to a temperature below the vitreous transition temperature, while being prevented from shrinking.

REFERENCES:
patent: 2468731 (1949-05-01), Borkland
patent: 2889651 (1959-06-01), Baldanza
patent: 2897546 (1959-08-01), Clapp
patent: 3341643 (1967-09-01), Barnhart
patent: 3414181 (1968-12-01), Sloan
patent: 3487133 (1969-12-01), Lindsay
patent: 3489265 (1970-01-01), Puente
patent: 3574807 (1971-04-01), Heavener
patent: 3767752 (1973-10-01), Karlyn

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