Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1976-01-19
1977-10-25
Simmons, David A.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156289, 156290, B32B 3100
Patent
active
040554520
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 surfaces 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.
REFERENCES:
patent: 2232640 (1941-02-01), Schwartzman
patent: 3023679 (1962-03-01), Piazze
patent: 3149017 (1964-09-01), Ehrreich et al.
patent: 3441460 (1969-04-01), Carmichael
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