초록 ▼

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 portio

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. second panel, 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, and wherein sealing the bag end after the bag has been filled with contents by heat activating the first layer of adhesive material and the second layer of adhesive material at a temperature below the softening point temperature of the polymeric bag material.

대표청구항 ▼

1. In a woven bag of polymeric material, the bag having a first panel, the first panel being foldable along a fold line of the first panel, and the bag having an adhesive coated surface on the first panel for adhesively bonding with an exposed portion of a second panel, the improvement comprising: t

1. In a woven bag of polymeric material, the bag having a first panel, the first panel being foldable along a fold line of the first panel, and the bag having an adhesive coated surface on the first panel for adhesively bonding with an exposed portion of a second panel, the improvement comprising: the adhesive coated surface on the first panel comprising a heat activated adhesive layer on a panel section above the fold line of the first panel, and on a further panel section below the fold line of the first panel, which is in combination with heat activated further adhesive material on a flap portion, the exposed portion of the second panel and exposed portions of gussets;the adhesive layer and the further adhesive material have respective heat activation melt temperatures below about 300° F. and below the softening point temperature of the polymeric material;the heat activated adhesive layer on the further panel section below the fold line providing an adhesive-to-adhesive seal with the heat activated adhesive layer on the panel section above the fold line while the bag is folded;the heat activated further adhesive material on the flap portion, the exposed portion of the second panel and the exposed portions of the gussets providing a further adhesive-to-adhesive seal with the heat activated adhesive layer on the further panel section below the fold line, while the flap portion is folded onto the further panel section below the fold line, to hold the bag in a folded configuration by the further adhesive-to-adhesive seal; andsaid adhesive-to-adhesive seal and said further adhesive-to-adhesive seal, resisting opening while the bag is filled with 50 lbs. of contents and, dropped on the first panel from a height of 4 feet and dropped on the second panel from a height of 4 feet, and further, resisting creep while the bag is suspended while filled with 20 lbs. of contents and subjected to an environment of Zero degrees F. for 72 hrs. and an environment of 140 degrees F. at 70% relative humidity for 72 hrs., and further, resisting peel and shear over a temperature range of −20 degrees F. to +140 degrees F. 2. The woven bag of claim 1, wherein the heat activated adhesive layers extend across an area of width ranging from ½ inch to 6 inches. 3. The woven bag of claim 1, wherein the first adhesive layer and the further adhesive layer comprise dried adhesive materials. 4. The woven bag of claim 1, wherein each of the adhesive layer and the further adhesive layer comprises an adhesive material soluble in an air dryable solvent. 5. The woven bag of claim 1, wherein each of the adhesive layer and the further adhesive layer comprises an adhesive material soluble in water and air dried. 6. The woven bag of claim 1, wherein the adhesive layer and the further adhesive layer are the same material. 7. The woven bag of claim 1, wherein each of the adhesive layers comprises an adhesive material soluble in an air dryable solvent. 8. The woven bag of claim 1, wherein each of the adhesive layers comprises a polymeric adhesive dispersed in water having a melt temperature below 300° F. and below the softening point temperature of the polymeric material of the bag. 9. The woven bag of claim 1, wherein first portions of said gussets are connected to the first panel, and second portions of said gussets are connected to the second panel, wherein the second portions of the gussets are longer than the first portions of the gussets. 10. The woven bag of claim 1, wherein the adhesive layer and adhesive material comprise aqueous dispersions of water based adhesive materials applied in liquid form and air dried to a stable, non-adhesive state. 11. The woven bag of claim 1, wherein the adhesive layer and the adhesive material comprise a waterborne acrylic adhesive. 12. The woven bag of claim 1, wherein the adhesive layer and the adhesive material comprise a polyurethane adhesive dispersed in water. 13. The woven bag of claim 1, wherein the adhesive layer and the adhesive material comprise a butyl, synthetic or natural rubber adhesive. 14. The woven bag of claim 1, wherein the adhesive layer and the adhesive material comprise polymer or co-polymer emulsions that are water- or solvent-based, including polyurethane dispersion adhesives, vinyls, acrylics, natural or synthetic rubber-based adhesives.