Plastic Bag Making Apparatus
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United States of America Patent
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Issued Date -
Aug 9, 2018
app pub date -
Apr 2, 2018
filing date -
Apr 2, 2018
priority date (Note) -
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status (Latency Note)
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Abstract
In an apparatus for successively making plastic bags, a laser beam irradiator irradiates laser beam onto webs of panel material and a body of zipper material to heat and melt the webs of panel material and the body of zipper material with the laser beam. The webs of panel material and the body of zipper material are fed intermittently at a speed predetermined to be changed by time. The irradiator is controlled on a feedforward control basis for the laser beam to be regulated in amount, the amount being calculated from the speed predetermined, to obtain a calculated value of amount. The laser beam is regulated in accordance with the calculated value to heat and melt the webs of panel material and the body of zipper material uniformly irrespective of the speed being changed.
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