Patent ID: 6808666
Filing Date: 2004-10-26
Classification: B29D,B65D,Y10T

Abstract:
A method of producing a zipper tape for a bag with a male strip formed on a base tape and a female strip formed on a base tape, the male strip and the female strip together forming a mating section, wherein each base tape has at least a three-layered structure comprising a thermally fused film which is heat-sealed onto an innermost layer of the bag, a heat-insulating film, having a higher melting point than that of the thermally fused film, laminated on a surface of the thermally fused film, and a thermally fused film, for formation of a mating section, laminated on a surface of the heat-insulating film, the method comprising the steps of:winding up the base tapes previously overlaid on each other into a roll state with a large width; feeding out the base tapes that were wound up into the roll state; extruding the male strips and female strips in rows in the state where adjoining male strips and female strips form pairs respectively from a miscellaneous extrusion molding machine and are thermally fused and bonded to a surface of the thermally fused film of the base tape for formation of a mating section; cutting the base tape with pairs each of a male strip and a female strip in rows into strips; mating the male strip and the adjoining female strip cut out from the base tape one by one to form a zipper tape; and winding each zipper tape out as a product.