FIBERS AND WEBS CAPABLE OF HIGH SPEED SOLID STATE DEFORMATION

摘要

The present invention relates to an intermediate web comprising of high glass transition polymer fibers. The fibers are spun at low to moderate speeds and have a relative crystallinity of from 10 % to 75 % of the maximum achievable crystallinity. The intermediate web is a low crystallinity web that exhibits shrinkage of more than 30 % and elongation to break of more than 80 % at high strain rates. This web can be heat treated to reduce shrinkage to less than 15 % while the web is capable of at least about 60 % elongation at a strain rate of at least about 50 second-1.