Hot melt adhesive systems for zipper assemblies on large bag constructions of various substrates
The present disclosure relates to a high burst slider zipper which allows for bottom filling of reclosable packages, such as large bags, and further provides increased resistance to damage from the dropping or shock loading of the filled package. This is achieved by providing a peel seal or other frangible or separable connection between the zipper profiles, and by sealing a portion of one of the flanges to itself by a hard seal above the peel seal. This causes the external forces on a bag from bottom filling or shock loading to be directed toward the hard seal and further directed so as to cause a shear force against the peel seal, thereby increasing the resistance of the package to external forces.
1. A method for manufacturing reclosable packages suitable for packaging a rated load, comprising the steps of:
providing a zipper assembly;
providing material for walls of the reclosable packages;
providing an adhesive chosen to maintain adhesion between the walls of the reclosable package and the zipper assembly for at least 72 hours at 140 degrees Fahrenheit, with at least 2.5 times the rated load applied to the zipper assembly;
applying the adhesive to the zipper assembly or the walls of the reclosable package;
bringing the zipper assembly and the walls of the reclosable package together whereby the adhesive forms a bond therebetween.
2. The method for manufacturing reclosable packages of claim 1 wherein the applying step is performed by a nozzle.
3. The method of manufacturing reclosable packages of claim 2 wherein the nozzle applies the adhesive in a downward direction.
4. The method of claim 1 further including the step of temporarily applying pressure the zipper assembly to the walls of the reclosable package.
5. The method of claim 1 further comprising the step of applying surface energy to a portion of the walls or zipper assembly.
6. The method of claim 5 wherein the step of applying surface energy comprises the step of corona discharge or plasma treatment.
7. The method of claim 1 wherein a bottom of the package is formed opposite from the zipper assembly and further including the steps of filling the package with contents through the bottom and subsequently closing the bottom.