A process for the preparation of an interlocking profile strips closure for a bag

摘要

A zipper closure tape 2 which can be used with a variety of combinations of plastics materials and which can be printed or coloured. The closure tape 2 has a mating section 3 comprising the male strip 3a and the female strip 3b bonded separately onto a three-layered base tape laminate 6, 7, 8 with a heat-insulating film 6 as an intermediate layer, the thermally fusible film 7 which is thermally fused and bonded to one side of the heat-insulating film 6 and which can be thermally bonded to the bag 5, and a thermally fused film 8 bonded to the other side of the film 6. The male strips 3a and female strips 3b are extruded onto the surface of film 8 of the base tape laminate. The base tape laminate is then cut along each adjoining male strip 3a and female strip 3b which are then mated with each other and the resulting tape wound up to provide the zipper tape product foe application to a bag.