Bag making machine with web tension control and method
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United States of America Patent
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Sep 23, 2003
Grant Date -
Jun 20, 2002
app pub date -
Nov 5, 2001
filing date -
Nov 3, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
A bag making machine including a film web supply roll, a draw roll for drawing the film web to a bag forming section, a seal bar in the bag forming section of the bag making machine for sealing the drawn film web, and a tension control system, the tension control system including a surface drive roll, a surface drive roll servo, a vacuum box, a torque mode capstan, a capstan servo drive, a draw roll servo drive, and a controller programable to control the film web tension in a first run of the film web between the supply roll and the torque mode capstan independently from the tension in a second run of the film web between the capstan and the draw roll.
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