专利名称：Method of severing and edge-sealing
thermoplastic sets of films
发明人：Richard S. Carlisle申请号：US05/326278申请日：19730124公开号：US03933563A公开日：19760120
摘要：A stack of many films of thermoplastic material is divided into sets of films byinterposed layers of seal-inhibiting material. A heated cutter as of copper is used having aheat-storage portion and a blade projecting from the heat-storage portion, both shapedaccording to the desired edge seal. The hot blade is pressed against the stack topenetrate successive films, top to bottom. Thereafter, the blade represents a hot wallopposite to the parted edges of the film in the stack, causing transfer of heat into thestack for causing a controlled width of opposed films to become fused together. Thetime is not critical where the heat used is that which is stored in the cutter. The lateralsurface of the blade extends from an edge, either perpendicular to the top surface of thestack or sloping away from the outline of the cut stack.
The edge seal is ideally about 20% thicker than the combined thickness of the filmsforming a finished article, but it can be much thicker. The inner surfaces of a pair of filmsare face-to- face, well-suited to form a pressure-releasable valve in a spout of acontainer, especially a self-resealing valve.
申请人：CARLISLE; RICHARD S.
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