Back seam welder and method of operation
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United States of America Patent
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Jun 7, 2016
Grant Date -
Oct 16, 2014
app pub date -
Apr 15, 2014
filing date -
Apr 15, 2013
priority date (Note) -
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Abstract
A thermal welder is configured to weld a back seam of a bag formed of thermoplastic sheet material, which may be a polywoven material. The welder typically includes a weld heater and a compression mechanism downstream of the weld heater to compress the sheet material to form the back seam. The welder also includes a weld breaker downstream of the compression mechanism to break apart incidental welds which are formed adjacent the back seam.
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