Biaxial stretch wrapping

  • US 5,522,203 A
  • Filed: 08/15/1991
  • Issued: 06/04/1996
  • Est. Priority Date: 10/02/1990
  • Status: Expired due to Fees
First Claim
Patent Images

1. A process for stretch wrapping a load with a sheet of stretch wrap packaging material comprising:

  • introducing the sheet of stretch wrap packaging material onto tips of projecting portions of a first grooved surface and spanning nonprojecting portions of the first grooved surface;

    transporting the sheet and the first grooved surface in a direction generally parallel to the grooves by powering the first grooved surface;

    impinging the sheet spanning the nonprojecting portions of the first grooved surface with tips of projecting portions of an idling second grooved surface downstream of where the sheet of stretch wrap packaging material is introduced onto the tips of projecting portions of the first grooved surface;

    transporting the tips of the projecting portions of the second grooved surface at a speed which is less than the speed of the tips of the projecting portions of the first grooved surface to suspend and stretch the sheet between the projecting portions of the first and second grooved surfaces in a direction transverse to the direction in which the sheet is transported without compressing the sheet between opposed portions of the first and second grooved surfaces;

    separating the stretched sheet from the first and second grooved surfaces; and

    wrapping the stretched sheet around a load.

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