Patent ID: 7077570
Filing Date: 2006-07-18
Classification: B29D,B65D,Y10T

Abstract:
1. A zipper tape for a bag with a male stripe and a female stripe as a mating section on a base tape produced by forming a plurality of pairs of the male stripe and the female stripe each pair extending in a row on the base tape with large width and cutting the base tape by each of the male strip and the male stripe, and having 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, said male strip and said female strip being extruded from a miscellaneous shape extrusion molding machine and being respectively thermally fused and bonded to a surface of the respective thermally fused film for formation of said mating section, wherein a polypropylene-based resin or a polyethylene-based resin is used for the thermally fused film in the base tape which is heat-sealed onto the innermost layer of the bag and an olefin-based resin comprising; a. a resin in which, in addition to a polypropylene-based resin, a polyethylene-based resin and an olefin-based resin including a polybutene as a third component is mixed; b. a resin in which, in addition to a polypropylene-based resin, a polyethlene-based resin and a polystyrene resin as a third component is mixed; or c. a resin in which, in addition to an ethylene acetate vinyl copolymer resin, a polyethylene-based resin and an olefin-based reformer as a third component is mixed is used as the thermally fused film for formation of the mating section.