METHOD FOR PRODUCING PLASTIC PRODUCTS WITH REINFORCED HEAT SEALED JOINTS
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United States of America Patent
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app pub date -
Oct 31, 2007
filing date -
Nov 2, 1999
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Abandoned
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Abstract
An envelope is made by at least heat sealing two face sheets. Each face sheet has thick marginal parts and spaced apart thick connection parts. The envelope has at least one heat-sealed peripheral joint, and a plurality of spaced apart heat-sealed seams. The heat-sealed seams are provided on the thick connection parts, and the heat-sealed peripheral joint is provided on the thick marginal parts. The thick connection parts have spaced apart longitudinal strips, and at least one transverse strip extending transversely of the longitudinal strips and interconnecting at least two of the longitudinal strips.
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