Method and apparatus for wrapping a load using variable roller stretch
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United States of America Patent
Stats
-
N/A
Issued Date -
Nov 28, 2002
app pub date -
May 23, 2001
filing date -
May 23, 2001
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A method and apparatus for wrapping the load at a desired wrap force are provided. The apparatus includes a dispenser for dispensing packaging material and means for providing relative rotation between the load and the dispenser. The dispenser has a prestretch portion and a post-stretch portion. The prestretch portion is configured to prestretch the packaging material within the dispenser to a point below the yield point of the packaging material. Preferably the packaging material is prestretched between first and second unpowered prestretch rollers. The post-stretch portion is configured to further stretch the prestretched packaging material to a point above the yield point of the packaging material as the packaging material moves from the dispenser to the load. Preferably, the post-stretch portion includes a friction element, such as a brake, to apply friction to one of the prestretch rollers.
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Family
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Cited Art Landscape
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