Heat activated adhesives for bag closures

摘要

A polymeric woven bag has a first panel and a second panel and an open end of the bag to be pinched closed. A first layer of heat activated adhesive material is on a portion of the bag to form an adhesive-to-adhesive seal by contact with a second layer of heat activated adhesive material on a portion of the bag, wherein a chemical family of the adhesive layers comprises polyolefin thermoplastic components, and wherein the first adhesive layer and the second adhesive layer have respective heat activation temperatures below the softening point temperature of the polymeric bag material.

主权项

1. A polymeric woven bag, comprising:
An outer layer of polymeric material; a woven bag layer of polymeric material; a first panel and a second panel and an open end of the bag to be pinched closed between the first panel and the second panel after filling the bag with contents; a first portion of the bag having a heat activated first adhesive layer of a hot melt adhesive; a second portion of the bag to be pinch closed with the first portion having a heat activated, second adhesive layer of a hot melt adhesive, wherein a chemical family of the adhesive layers comprises polyolefin thermoplastic components, the first adhesive layer and the second adhesive layer have respective heat activation temperatures below the softening point temperature of the polymeric material, and the first adhesive layer and the second adhesive layer are activatable to adhesive states to form an adhesive-to-adhesive seal to seal the open end of the bag by an application of heat at a temperature below the softening point temperature of the polymeric material, and without heating the first adhesive layer and the second adhesive layer to their melt flow state temperatures; wherein the heat activated adhesive layers extend in an area across the bag and the layers have respective widths ranging from ½ inch to 6 inches.