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US 5,417,638 AGranted
Method and apparatus for maintaining proper perforation phasing
AssigneeFMC Corporation
InventorsDanford C. Anderson, Peter J. Hatchell, Emiel Lambrecht
Life of this patent
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AssigneeFMC Corporation
InventorsDanford C. Anderson, Peter J. Hatchell, Emiel Lambrecht
Estimating the term…
In an apparatus for making plastic bags or the like from a continuous film of material comprising a sealing drum having at least one seal bar for imparting transverse seals to the film at regularly spaced intervals and a perforator having a rotatable perforator blade for imparting transverse perforations to the film at regularly spaced intervals, an apparatus and method are disclosed for tracking the positions of each seal and each perforation and comparing the difference between these positions to a desired difference and thereafter adjusting the rate of rotation of the perforator blade until the difference between the positions of each seal and each perforation is equal to the desired difference to thereby maintain a desired spacing between each seal and each perforation.
In an apparatus for making plastic bags from a continuous film of material comprising a sealing drum having at least one seal bar for imparting transverse seals to the film at regularly spaced intervals and a perforator having a rotatable perforator blade for imparting transverse perforations to the film at regularly spaced intervals, the improvement comprising:
A method of producing plastic bags from a continuous film of material having printed matter appearing thereon at regularly spaced intervals, comprising the steps of:
Dependencies are inferred from the claim text.