Buffer Layer for Strings

Abstract

A thin buffer layer is used to coat on the multi-filament wrapped string to fill the gaps. The polymers of the buffer-layer coating have a high melt-flow (low viscosity) during coating process to fill all the gaps between the filaments, and the filaments are fixed by the coatings onto base core materials.

1 . A coating for a string, comprising:
 a core filament wrapped with a plurality of wrapping filaments of a smaller diameter than the core filament;   a buffer layer coating filling in gaps between the wrapping filaments and between the wrapping filaments and the core filament; and   an outer coating covering over the buffer layer coating, wrapping filaments and core filament.   
   
   
       2 . The coating of  claim 1 , wherein the buffer layer coating comprises a polymer. 
   
   
       3 . The coating of  claim 1 , wherein the buffer layer coating comprises nylon. 
   
   
       4 . The coating of  claim 3 , wherein the buffer layer coating comprises nylon 6. 
   
   
       5 . The coating of  claim 3 , wherein the buffer layer coating comprises nylon 11. 
   
   
       6 . The coating of  claim 3 , wherein the outer coating comprises a composite of nylon and clay nanoparticles. 
   
   
       7 . The coating of  claim 3 , wherein the outer coating comprises a composite of nylon and carbon nanotubes. 
   
   
       8 . The coating of  claim 6 , wherein the outer coating further comprises a modifier. 
   
   
       9 . A method for coating a string comprising:
 wrapping a core filament having a first diameter with one or more wrapping filaments having a second diameter that is less than the first diameter;   extruding a melted nylon into gaps between the one or more wrapping filaments and into gaps between the wrapping filaments and the core filament;   extruding a coating on a circumference of the string so that it covers the one or more wrapping filaments and the melted nylon in the gaps.   
   
   
       10 . The method of  claim 9 , wherein the melted nylon comprises nylon 6. 
   
   
       11 . The method of  claim 9 , wherein the melted nylon comprises nylon 11. 
   
   
       12 . The method of  claim 9 , wherein the coating comprises a composite of nylon and clay nanoparticles. 
   
   
       13 . The method of  claim 9 , wherein the coating comprises a composite of nylon and carbon nanotubes. 
   
   
       14 . The method of  claim 9 , wherein the coating comprises a composite of nylon and ceramic particles. 
   
   
       15 . The method of  claim 9 , wherein the coating comprises a composite of nylon and glass particles. 
   
   
       16 . The method of  claim 9 , wherein the coating is between 1 and 100 micrometers thick. 
   
   
       17 . The coating of  claim 1 , further comprising:
 another plurality of wrapping filaments wrapped around the outer coating;   another buffer layer coating filling in gaps between the another plurality of wrapping filaments; and   another outer coating covering over the another buffer layer coating.   
   
   
       18 . The coating of  claim 3 , wherein the coating comprises a composite of nylon and glass particles. 
   
   
       19 . The coating of  claim 3 , wherein the coating comprises a composite of nylon and ceramic particles.