Three processing technologies of PTFE fiber by film splitting

emulsion and gel spinning

and paste extrusion were overviewed and investigated in this paper. PTFE staple fiber and filament processing technology by film splitting was established based on the proprietary die design and processing parameters on fiber fineness

uniformity

mechanical properties

thermal shrinkage were discussed; PTFE short fiber processing technology was put forward by PTFE emulsion and PVA solution blending and then complexing between PVA and boric acid

the effects of sintering and drawing were also discussed. PTFE filament processing technology using paste extrusion facilitated by the readiness of fibrilation of PTFE resin under shear was optimized through control of die entrance

conical die design

and die land/diameter ratio

and lubricant type screening.