Method and apparatus for manufacturing porous...

Details Method and apparatus for manufacturing porous... Method and apparatus for manufacturing porous...

C - Chemistry, Metallurgy

08

J

18/29

C08J 9/24 (2006.01)

Patent

CA 1254707

ABSTRACT An improved method and apparatus for manufacturing a porous polytetrafluoroethylene (PFTE) material with high strength properties. Such method comprises forming a molded article from a mixture of unsintered PFTE and liquid lubricant by extruding and rolling, and subsequently combining the previously-used separate steps of 1) eliminating liquid lubricants by evaporation or extraction, 2) rendering the molded article porous by stretching, and 3) sintering the porous article to fix the porous structure, into one simultaneous operation carried out at a temperature not lower than 390°C, to obtain a material having a Young's Modulus of more than 10,000 kg/cm2 and a matrix tensile strength of more than 1,100 kg/cm2 . By simultaneously carrying out the above 3 steps a resultant saving in equipment necessary, time, energy, and labour is realized. The apparatus incorporates a hot air furnace through which the molded article is drawn under continuous tension. Air temperature may be controlled by circulating air through a heater.

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