Teijin Aramid Gmbh

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Robin Winters

Christoph Jorg Hahn

Christian Norhausen

Jutta Krabbe

Christoph Hahn

Manufacturing a spun-dyed para-aramid filament yarn includes (a) preparing a spin dope comprising a para-aramid polymer, at least one dyestuff and concentrated sulfuric acid, (b) spinning the spin dope through a spinneret to obtain spun filaments, (c) coagulating the spun filaments to obtain coagulated filaments, (d) neutralizing the coagulated filaments to obtain neutralized filaments, (e) washing the neutralized filaments to obtain washed filaments, and (f) drying the washed filaments to obtain dried filaments. In step a) the spin dope includes 17.5 to 18.5% by weight of a para-aramid polymer with respect to the weight of the spin dope, and 4 to 15% by weight of the at least one dyestuff with respect to the weight of the para-aramid polymer plus the at least one dyestuff. In step f) the filaments are hold under a tension in a range from 0.2 to 0.8 cN/dtex.

Process to manufacture a spun-dyed para-aramid filament yarn and sliver

A staple fiber yarn having at least one twisted thread. The twisted thread includes a mixture of first staple fibers and second staple fibers. The first staple fibers are produced from high-strength filaments and the second staple fibers have a shrinkage in the range from 5% to 50%. The weight ratio of the first to second staple fibers lies in the range of 5:95 to 45:55. A method for producing a textile article wherein shrinkage is implemented either on the staple fiber yarn, after which the article is produced from the shrunken staple fiber yarn, or on the article containing the non-shrunken staple fiber yarn. The textile article has a wear resistance that is similarly high or indeed even higher than that of a correspondingly produced textile article, the staple fiber yarn of which consists exclusively of first staple fibers that are produced from high-strength filaments.

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Wuppertal, Germany

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