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AssigneeToray Industries, Inc.
InventorsShuichi Yamanaka, Masakatsu Shinto, Haruki Morikawa, Toshiyuki Miyoshi, Keizo Ono, Makoto Endo, Jun Yamazaki
Estimating the term…
A separable tow of elongated polymeric filaments comprises a plurality of distinct sub-tows lightly and individually and separably joined, as by light crimping together along their edges or, if uncrimped, joined by presence of moisture, and capable of being packed into a container and later removed and separated. The filaments are preferably acrylic and have a total fineness of about 300,00-1,500,000 denier and the sub-tows each of which has a total fineness of about 50,000-250,000 denier, with a filament fineness of about 1-2 denier, and each sub-tow has a degree of entanglement of about 10-40 m−1 as measured by the hook drop test. The separable tow is made of a plurality of sub-tows, after separately drawing the sub-tows and subsequently removably joining the sub-tows into a single tow.
A precursor fiber bundle for producing carbon fibers comprising a single tow comprising a plurality of divided sub-tows in parallel wherein each sub-tow is defined by a plurality of elongated polymeric filaments, and wherein said single tow comprises an acrylic polymer having a total fineness in the range of about 300,000 denier to about 1,500,000 denier and wherein said plurality of sub-tows each have a fineness in the range of about 50,000 denier to about 250,000 denier wherein said sub-tows are comprised of a plurality of sub-tow filaments.
A carbon fiber bundle having a total fineness of not less than about 25,000 denier, substantially no twist, and a degree of entanglement in the range of about 10 m−1 to about 100 m−1 according to the hook drop testing method.
Dependencies are inferred from the claim text.