Foldable sheet plastic products
AssigneeSealtran Corporation
InventorEdison L. Rhyner
Life of this patent
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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.
Claims7
In an improved sheet plastic product of the kind comprising first and second panels of matched size and configuration formed from a single sheet of plastic material of nominal given thickness and having a fold line of predetermined depth D1, less than the thickness of the plastic sheet, cut into the plastic sheet at the juncture of the two panels to permit folding the two panels together into parallel facing engagement with each other, the improvement comprising a fold line cut to the predetermined depth D1 throughout most of the juncture between the two panels and cut to a preselected depth D2 substantially less than D1 in the remaining minor fractional portion of the fold line length to assure retention of at least one alignment hinge between the panels when the panels are folded together into parallel facing relation, in which the depth D1 is about three-fourths of the thickness of the sheet plastic material and in which the depth D2 is about one-half of the thickness of the sheet plastic material.
Dependencies are inferred from the claim text.