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RESEARCH AND DEVELOPMENT OF HIGH TENACITY FIBERS POLYOLEFINS.
UNITED STATES RUBBER CO WAYNE N J RESEARCH CENTER
The conversion of our spinning four filaments to eight filaments was achieved without complications and a top spinning speed of 500 ftmin has been reached. An improvement in the intrinsic viscosity of the spun filaments has been realized through the practice of blanketing the molten filaments within the thermal jacket with nitrogen. The breaking elongations are noticeably improved, perhaps by a factor of one-third. The tenacities have been maintained and are reasonably high. The development of Profax 6823 fiber strength increases with an increasing amount of orientation fixed during spinning, a justifiable reversal of an earlier observation. This finding lessens in part the need for achieving spinning speeds beyond our already realized current levels. A surface roughness effect was observed this quarter which appears to be limiting further improvements both in spinning speed and in the attainment of higher strength. The problem remains to be explored. Author
Quarterly progress rept. no. 6, 1 Nov 63-31 Jan 64,
See also AD-605 222.