Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Starting material is nonhollow planar finite length preform...
Patent
1988-02-22
1989-08-29
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Starting material is nonhollow planar finite length preform...
264 468, 264553, 264322, 264510, 264511, B29C 6518
Patent
active
048615439
ABSTRACT:
A method for forming finished coverstocks includes automatically heating and indexing slightly overlapped rough seams of coverstock segments with respect to a single thermoforming tool that automatically opens and closes to vacuum fold the rough seams interiorly of the tool and thereafter the folds are pinched to form a finished styling line on the class A surface of the coverstock. An apparatus is provided in which a single thermoforming tool has relatively moveable mold parts that shape the coverstock and include an expandable joint line configured to fold the rough seams and further including slide members responsive to closure of the mold parts to provide space to accommodate the fold for pinching it off with respect to the class A surface. The product of the invention includes multiple coverstocks with finished styling lines formed by pinched off folds on the hidden side of the coverstock.
REFERENCES:
patent: 3042974 (1962-07-01), Gerstenmaier et al.
patent: 3141196 (1964-07-01), Langecker
patent: 4116736 (1978-09-01), Sanson et al.
patent: 4738809 (1988-04-01), Storch
Davidson Textron Inc.
Evans John C.
Kuhns Allan R.
Silbaugh Jan H.
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