Method and apparatus for registration of a seal on a plastic bag

Details Method and apparatus for registration of a seal on a plastic bag Method and apparatus for registration of a seal on a plastic bag

1994-08-12

1996-12-24

Simmons, David A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156353, 156360, 156361, 493 11, 493 24, 493208, B32B 3100

Patent

active

055870325

ABSTRACT:
A plastic bag making machine includes a cylindrical drum with a variable diameter. A plurality of seal bars define the circumference of the drum, and are substantially parallel to the drum's rotational axis. The bags are made from a plastic film with registration marks that are detected by a detector disposed near the film. A detector also detects each revolution of the drum and an encoder provides signals indicative of the position of the film. A controller determines the distance phase of the registration marks and the rum size error. The drum diameter is adjusted in response to an output of the controller in such a way as to correct for both the initial drum size error, the initial phase error, and the phase error accumulated while the drum diameter is being corrected.

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