A pressure-holding steam tube type drawing device and method for producing polyacrylonitrile precursor for carbon fiber

Abstract

The invention discloses a pressurized steam pipe type drafting device and method for production of polyacrylonitrile filaments for carbon fibers. The device comprises a steam guide-in system, a steam condensation system, a chamber, drafting drivers, a drafting cavity, seal cavities and exhaust pressure reduction cavities. The drafting drivers are arranged on two sides of the chamber, and the seal cavities and the exhaust pressure reduction cavities are sequentially arranged on two sides of the drafting cavity in the middle of the chamber. A plurality of groups of abreast air inlet pipes in the middle and pre-heating pipes and drafting pipes on two sides of the air inlet pipes are arranged in the drafting cavity. The steam guide-in system guides saturated steam into the air inlet pipes, the exhaust pressure reduction cavity discharges saturated steam into the steam condensation system, and strands are drafted in from the exhaust pressure reduction cavity on one side of the chamber by the drafting drivers and sequentially pass through one seal cavity, the pre-heating pipes, the air inlet pipes, the drafting pipes and the other seal cavity to get out from the exhaust pressure reduction cavity on the other side of the chamber. The pressurized steam pipe type drafting device and method have advantages that high-speed continuous spinning is realized while high strength, compactness and fine denier of filaments are realized, and fiber uniformity is guaranteed.

Description

technical field [0001] The present disclosure generally relates to the technical field of chemical fiber manufacturing, in particular to production equipment for the high-performance carbon fiber industry, and in particular to a pressure-holding steam tube drafting device and method for producing polyacrylonitrile precursors for carbon fibers. Background technique [0002] At present, most domestic manufacturers of carbon fiber precursors adopt saturated or superheated steam plate drafting technology. The two ends of the box are composed of sealed chambers, and the middle section is the drafting chamber. The gap between the upper and lower boxes is 1.0-1.5mm. Using this technology to draft the fibers, the drafting pressure is low, only 0.15-0.3 MPa; the drafting box is large, and all the tows are in one box; 1. Many original filaments are broken; 2. Poor bundling; 3. Poor passage of tows for a long time, and interference between tows is easy to occur ; 4. The amount of loss...

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Problems solved by technology

[0002] At present, most domestic manufacturers of carbon fiber precursors adopt saturated or superheated steam plate drafting technology. The two ends of the box are composed of sealed chambers, and the middle section is the drafting chamber. The gap between the upper and lower boxes is 1.0-1.5mm. Using this technology to draft the fibers, the drafting pressure is low, only 0.15-0.3 MPa; the drafting box is large, and all the tows are in one box, which will lead to; 1. Too many broken filaments; 2. Poor bundling; 3. Poor passage of tows for a long time, and interference between tows is easy to occur ; 4. The amount of loss is large, and the wire cannot be drawn separately after a small number of tows are broken; 5. The steam drafting ratio is greatly limited, and higher drafting cannot be performed, which will eventually affect the performance uniformity and performance of the raw silk product. Increased spinning speed

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