Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Dividing work to form plural articles
Patent
1980-02-04
1981-08-11
Lowe, James B.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Dividing work to form plural articles
264281, 264339, 264DIG40, 4253051, 425363, 425391, 425DIG5, 425DIG7, B29C 1702
Patent
active
042833620
ABSTRACT:
A method and apparatus for making a self-coiling sheet. The apparatus includes a work station at which a relatively short section of a sheet of flexible material, e.g., crystalline polyethylene terephthalate, is folded upon the remainder of the sheet. The sheet is then advanced onto the carrier plate which, in turn, is mounted for movement toward and away from a gap defined by a pair of superposed pressure-applying rollers. The carrier plate is adapted to deposit the sheet between the rollers such that the folded section of the sheet is located in engagement with one of the rollers and the underlying portion of the sheet is in engagement with the other roller. The rollers are rotated in the same direction so as to drive the folded section of the sheet toward the carrier plate while simultaneously driving the remainder of the sheet in the opposite direction. This action results in the sheet being ejected from the gap of the rollers as a multi-layered generally cylindrical coil having a permanent set. The sheet may be uncoiled and, when left free, will automatically return to its coiled condition.
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Corrigan Alfred E.
Lowe James B.
Polaroid Corporation
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