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专利名称：Tubular bag and method of making the
same
发明人：Robert H. Blamer申请号：US06/242267申请日：19810310公开号：US04461031A公开日：19840717
摘要：A tubular web has a bottom which is tightly sealed to enable pressurizing of thebag, the bottom including a first band of thermosetting glue imprinted across the lengthof the web at the interior of the tube. A second band and a third band of thermosettingglue are imprinted on the tube at the exterior thereof in registry with the ends of thefirst band and jointly extend across a rear panel. The tube has a turned up bottomdefined by a fold along a line extending centrally along the imprinted bands, eachportion of the thermosetting glue bands being thermally fused only to other portions ofsuch bands in contact therewith. In one embodiment, there is a second fold along asecond line spaced from the turned up bottom which defines an area between thesecond line and the turned up bottom, such area being joined by glue to the back panel.A back seam extends into the bottom and includes an inner layer of grease-proof paperand an outer layer of different paper, each paper glued to itself along marginal edgesthat are spaced apart.
申请人：BAGCRAFT CORPORATION OF AMERICA
代理机构：Hill, Van Santen, Steadman & Simpson
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