Method and apparatus for interleaving plastic bags
AssigneeCMD Corporation
InventorsPeter J. Gietman, Jr., Stephen A. Saindon
Life of this patent
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Abstract
The present invention is directed to a method and apparatus for winding bags. A winder in accordance with the present invention includes a dancer assembly for speed regulation, a haul-in assembly for receiving a film, and a tumbler assembly to receive the film from the haul-in assembly. The tumbler assembly increases the path length the film travels to either separate bags and/or to provide for interleaving.
Claims17
An apparatus for winding a roll of bags, each bag having a length L, a leading end and a trailing end from a film of bags comprising:
- a dancer assembly;
- a haul-in assembly, including at least one haul-in roll operating at a haul-in speed;
- a tumbler assembly disposed to receive the film from said haul-in assembly, said tumbler assembly including a rotating tumbler means for separating adjacent bags and for increasing the length of the path the trailing end of each bag travels by at least a length S=DI * (1-(L-D)/L) where DI is an infeed bag length, and said tumbler assembly further includes means for interleaving the bags, whereby the leading end of a second bag is downstream of the trailing end of a first bag by a length D;
- and
- a winding assembly disposed to receive the film from said tumbler assembly, wherein said winding assembly operates at a speed less than said haul-in speed.
A method for winding interleaved bags from a strip of bags, each bag having a length L and a leading and a trailing end, comprising the steps of:
- driving the strip at a first speed in a first stage;
- driving the strip at a second speed in a second stage, said second stage being downstream of said first stage, wherein said second speed is less than said first speed;
- increasing the path length by at least a length S that the trailing end of each bag follows between the first and second stages;
- interleaving said bags when said path length is increased, whereby the trailing end of a first bag overlaps the leading end of a second bag by a length D, where S=DI * (1-(L-D)/L) and DI is an infeed bag length.
Dependencies are inferred from the claim text.