Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1992-11-17
1994-06-14
Tentoni, Leo B.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
428910, C08F11426
Patent
active
053211090
ABSTRACT:
A uniformly expanded PTFE film is provided by extruding a PTFE film and gripping the unexpanded film about its periphery with a number of symmetrically disposed gripping members each equidistant from the center of the film. The extruded PTFE film is heated to a temperature in the range of 200-300 degrees Centigrade before expanding the extruded PTFE film. The gripping members are simultaneously rotated through an arc away from the center of the film, as by pivotally securing each gripping member to the end of an associated expansion arm and rotating the end of each expansion arm away from the center of the film while maintaining the gripping members equidistant from the center of the film. The expansion arms are uniformly rotated by a geared shaft powered by a drive mechanism that extends through the wall of an oven for coupling to an external motor.
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T. M. Long Co. Inc., undated product catalog of laboratory Instruments, pp. 1-36, "Film Stretcher".
Bosse Charles F.
Kowligi Rajagopal R.
Impra, Inc.
Tentoni Leo B.
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