Foldable sheet plastic products

Details Foldable sheet plastic products Foldable sheet plastic products

1981-08-05

1985-09-10

Thomas, Alexander S.

Stock material or miscellaneous articles

Hollow or container type article

Cellular material derived from plant or animal source

428 43, 428124, 428172, 428156, 40 10D, 206390, 206395, 206492, B32B 330

Patent

active

045406120

ABSTRACT:
An improved foldable sheet plastic construction, employed in a butterfly pouch for use in making plastic laminated data cards, and in a plastic fan-fold product, both comprising adjacent panels made from a single sheet of plastic material that must be folded along a fold line into parallel facing relation. The fold line has a two-level hinge cut. A major portion of the fold line is cut to a predetermined depth that assures easy folding but may cause separation of adjacent panels; a minor fractional portion of the fold line is cut to a substantially shallower depth to preclude separation of the panels on folding. In the preferred construction, the shallow cut is made at two or more spaced locations along the fold line to provide plural hinges.

REFERENCES:
patent: 3368692 (1968-02-01), Voller
patent: 3547752 (1970-12-01), Janssen
patent: 3963124 (1976-06-01), Banks
patent: 4317852 (1982-03-01), Ogden

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