Method and apparatus for enhancing evacuation of bulk material shipper bags

  • US 6,427,873 B2
  • Filed: 01/18/2001
  • Issued: 08/06/2002
  • Est. Priority Date: 01/28/1998
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of enhancing evacuation of a multiple-ply bag of the pillow bag type, the pillow bag including a seam at least partially about a circumference of the bag and including at least two upper plies and at least two lower plies, the plies being of substantially identical dimension and being sealed together at respective edges by the seam, regions between the upper plies being sealed off from respective regions between the lower plies, the pillow bag containing a bulk material and including an exit region from which the bulk material can flow from the bag, the method including the steps of:

  • connecting a region between two plies of the multiple-ply bag to a source of pressurized air;

    emptying the viscous contents of the bag from the exit region; and

    allowing pressurized air from the source of pressurized air to inflate the region between the two plies when enough of the contents of the bag has been emptied that a pressure exerted on an inner of the two plies by the pressurized air is greater than a pressure exerted on the inner of the two plies by the contents, the inner of the two plies thereby urging the contents toward the exit region of the bag.

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