Method for compensating shrinkage of plastic webs

Details Method for compensating shrinkage of plastic webs Method for compensating shrinkage of plastic webs

1998-07-27

2000-03-28

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264280, 264293, 264320, B29C 4358, B29C 5902

Patent

active

060427612

ABSTRACT:
When producing plastic cards, a plurality of layers is laminated under application of heat and pressure resulting in unpredictable shrinking. In order to compensate shrinking, the laminated web is elongated to adapt to its nominal alignment size. Elongation is produced by material displacement along grid bars separating to-be-fabricated cards later punched off the web leaving a waste grid.

REFERENCES:
patent: 3615149 (1971-10-01), Melzer et al.
patent: 4064206 (1977-12-01), Seufert
patent: 4183981 (1980-01-01), Rossolin
patent: 5320514 (1994-06-01), Kanome et al.

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