Method for infiltrating water-proof material into zipper

Abstract

A method for infiltrating a water-proof material into a zipper, includes the steps of combining an upper mold with a lower mold, filling a liquid polyurethane (PU) rubber into the mold cave of the upper mold, drawing the zipper through the underside of the mold cave such that the liquid PU rubber will infiltrate into the fabric of the zipper tapes, passing the zipper through a scrapper portion formed at the lower edge of the upper mold to remove surplus liquid PU rubber, and forming a laminate on the zipper tapes, so as to accomplish a water-proof zipper.

1 . A method for infiltrating a water-proof material into a zipper, including the following steps: 
 A. providing a lower mold, which can receive a zipper;    B. providing on the top of the lower mold an upper mold, which keeps a gap from the lower mold and has at least one mold cave going through to said gap, and    C. disposing a zipper on the lower mold, such that the zipper is attached to the bottom of the upper mold and is able to move freely in the gap;    D. filling the mold cave with a liquid impermeable material, which will contact the surface of the zipper and infiltrate into the fabric of the zipper tapes; and    E. forming an impermeable layer on the surface of the zipper after the liquid impermeable material is solidified.    
   
   
       2 . The method for infiltrating a water-proof material into a zipper according to  claim 1 , wherein after accomplishment of step D, a heating device can be applied for drying the zipper surface to expedite humidifying the impermeable liquid material.  
   
   
       3 . The method for infiltrating a water-proof material into a zipper according to  claim 2 , wherein the lower mold is provided with a positioning recession, in the center of which is provided with a groove.  
   
   
       4 . The method for infiltrating a water-proof material into a zipper according to  claim 1 , wherein the bottom edge of the mold cave has a scraper portion.  
   
   
       5 . The method for infiltrating a water-proof material into a zipper according to  claim 1 , wherein the liquid impermeable material is a liquid polyurethane (PU) rubber.  
   
   
       6 . The method for infiltrating a water-proof material into a zipper according to  claim 1 , wherein in addition to the upper mold, a supplementary upper mold, which is provided with a scraper portion at the bottom of the mold cave, can be alternatively provided, such that there is a selectively adjustable drop height between the scrapper portion and the bottom surface of the mold cave.  
   
   
       7 . The method for infiltrating a water-proof material into a zipper according to  claim 6 , wherein the zipper is moving on the lower mold during process, the zipper goes from the primary molds to the supplementary molds to accomplish a multi-process manufacture, such that the liquid impermeable material accumulated on the zipper would become thickened.  
   
   
       8 . The method for infiltrating a water-proof material into a zipper according to  claim 6 , wherein a heating device can be further provided between the primary upper mold and the supplementary upper mold.  
   
   
       9 . The method for infiltrating a water-proof material into a zipper according to  claim 6 , wherein after the liquid impermeable material applied onto the zipper surface is solidified, a pattern can be imprinted on the zipper surface with colorant.  
   
   
       10 . The method for infiltrating a water-proof material into a zipper according to  claim 9 , wherein the colorant for imprinting pattern on the zipper surface can be added with metal powder.