Description
of the process
Our products available
for this process
arious chemical substances can coat either glass filament yarns
or fabrics. Major applications are:

- PVC coated yarns for sun and insect screening.
- PTFE coated fabrics for high end printed wiring boards (low dielectric constant / low losses), architectural and roofing membranes. Specific properties of PTFE fabrics as non-stick and smooth surface, resistance to chemicals, compliance with food regulation, temperature resistance, high tensile strength serve a wide range of applications including food processing, conveyor belts, release sheets, thermal insulation, sealing...


PVC coated yarns:
Single yarns pulled from a creel are drawn through a PVC jet or bath and a die to form the desired round section shape. Then the coated yarn is dried and thermally cured in a continuous oven and wound onto a paper tube to make products suitable for further textile operations like beaming, weaving. Required properties of single yarns are high twist to promote round section, high tensile strength, compatibility with PVC in order to avoid part of yarn with no coating.

PTFE coated fabrics:
Glass fabrics are impregnated on a finishing line with PTFE dispersion. The coating layer build up occurs in three steps: elimination of water, removal of dispersion surfactants to 250° /280°C, sintering to 450°C (842°F). The impregnation process can
be repeated till 8 times in order to reach the required PTFE thickness. Other chemicals can be added to impart specific properties. Additional partial heat cleaning is also sometimes processed
in order to suit the required color of fabric.




EC9 34 Z40 (G150) Saint-Gobain Vetrotex yarns sized with the TD24M size system, suits very well the requirements for PVC single yarn coating."

All the Saint-Gobain Vetrotex sizes designed for heat cleaning, perform superbly for the PTFE coating fabric process.