PBT fiber manufacturing method based on high speed one-step method

Abstract

The invention discloses a PBT fiber manufacturing method based on a high speed one-step method. The method includes the following steps that PBT slices are dried until the moisture content is lower than 40 ppm; a spinneret plate is selected; the PBT slices are heated and melted in a screw extruder, and after the heated and melted polymer melt is extruded by a screw rod, the melt enters an on-line switchable melt filter to be filtered; after a strand is extruded by a spinneret, even side blowing air is used for cooling; by high-speed spinning, the filter degree of orientation is increased, and crystallization can be conducted under tension induction. According to the PBT fiber manufacturing method based on the high speed one-step method, by selecting the length-diameter ratio of the spinneret plate, controlling the spinning speed and changing the side blowing air speed distribution, PBT fibers capable of being used for weaving directly can be prepared on conventional polyester POY production equipment through the one-step method, the weight stability and the dyeing property of products are greatly improved compared with conventional PBT filament fibers, taking a 80dtex / 24f product as the example, the color ratio in the dyeing process can reach 99%, and the fixed weight ratio exceeds 95%.

Description

technical field [0001] The invention relates to a PBT filament fiber, in particular to a manufacturing method of the PBT filament fiber. Background technique [0002] At present, conventional PBT filament fibers are produced by a two-step process, and the process flow is as follows: [0003] Pre-spinning: slicing, drying tower, screw extruder, melt filter, spinning box (gas-phase heat medium insulation), metering pump, spinning assembly, side blowing, cluster oiling, network device, winding, obtaining POY; [0004] Post-spinning: POY passes through the original yarn frame, the first roller, the first hot box (deformation), cooling plate, false twist deformation, the second roller, the second hot box (setting), the third roller, oiling, after winding Graded packaging. [0005] This process mainly has the following disadvantages: [0006] (1) Long process flow, many quality control points, and high quality risk; [0007] (2) The processing speed is low, the energy consump...

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Problems solved by technology

[0008] (3) The fabric made of fiber has a bad fit, and the wearer feels hard and uncomfortable. It is not suitable for processing knitted and warp-knitted close-fitting fabrics, and the end use is limited.

There are the following two documents that are closer to this patent: "Discussion on PBT-POY Production Process" from "Polyester Industry" Issue 06, 2011, although it is mentioned that PBT chips are used to produce PBT fibers on high-speed spinning devices, but The product of this method is POY, also needs after-processing just can be used for weaving, is different from the one-step method of the present invention and can be directly used in the PBT fiber of weaving; "Discussion on PBT Fiber Production, Weaving, Dyeing and Finishing Process" in "Academic Papers", although the production of PBT fiber is mentioned, this method also adopts a two-step method to prepare PBT fiber, which is essentially different from the present invention.

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