Stock material or miscellaneous articles – Structurally defined web or sheet – Including variation in thickness
Patent
1975-09-22
1977-10-11
Cannon, J.C.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including variation in thickness
156251, 156306, 428172, 428192, 428195, B32B 302, B32B 326, B32B 704, B32B 3120, B32B 3126
Patent
active
040536718
ABSTRACT:
A stack of many films of thermoplastic material is divided into sets of films by interposed layers of seal-inhibiting material. A heated cutter as of copper is used having a heat-storage portion and a blade projecting from the heat-storage portion, both shaped according to the desired edge seal. The hot blade is pressed against the stack to penetrate successive films, top to bottom. Thereafter, the blade represents a hot wall opposite to the parted edges of the film in the stack, causing transfer of heat into the stack for causing a controlled width of opposed films to become fused together. The time is not critical where the heat used is that which is stored in the cutter. The lateral surface of the blade extends from an edge, either perpendicular to the top surface of the stack or sloping away from the outline of the cut stack.
The edge seal is ideally about 20% thicker than the combined thickness of the films forming a finished article, but it can be much thicker. The inner surface of a pair of films are face-to-face, well-suited to form a pressure-releasable valve in a spout of a container, especially a self-resealing valve.
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