Steam heat-treatment method for polybenzazole fiber
AssigneeThe Dow Chemical Company
InventorKazuyuki Yabuki
Life of this patent
Estimating the term…
Abstract
This invention aims at improvement of heat-treatment technology for manufacture of large amounts of polybenzazole fibers. The fibers are heat treated using steam as the heat treatment gas in a device that provides for a rapid, cocurrent, countercurrent or both cocurrent and countercurrent flow of steam.
Claims9
A method to heat treat a polybenzoxazole or polybenzothiazole fiber comprising contacting the polybenzoxazole or polybenzothiazole fiber under tension in a heat treating zone with a heating medium heating gas, with the heating medium heating gas being steam which moves through the heat treating zone in a cocurrent or countercurrent fashion relative to the fiber.
Dependencies are inferred from the claim text.