Dacron thin-denier high-hollow short fiber and its production method

Abstract

This invention relates to a terylene fine high hollow short fiber and its production method, which reasonably designs the parameters of three sections of an arc slit nozzle and designs the cooling blow angle of 20 minus or plus 5deg, in which, the section shape of the fiber produced by this method is a triangle-like with three sides convex to an arc, the titer is 1.56~1.67dtex and the hollow degree is 20 minus or plus 3%, which solves the contradiction between the titer and the hollow degree to secure the fine heat-insulating property of the fiber.

Description

technical field [0001] The invention relates to a hollow fiber, in particular to a polyester fine denier high hollow staple fiber and a production method thereof. Background technique [0002] The denier of the existing polyester high hollow fiber is generally above 3.3dtex, which is mainly used as a filling material for quilts, pillows, toys, sofas, etc., but cannot be used as fabric raw materials. Even if the existing polyester fine denier hollow staple fiber can achieve a fineness of 1.67dtex, it loses its true meaning of heat preservation and light weight because it has only a hollowness of about 10%. [0003] At present, most of the domestic and foreign manufacturers of hollow fiber production use the spinneret hole type is basically C type, two-segment arc slit type, etc. figure 1 It is a schematic diagram of the three-segment arc slit nozzle. The hollow fiber is produced by adopting the three-segment arc slit nozzle structure. If the hollowness is large, the solid i...

AI Technical Summary

Problems solved by technology

When designing the size, because it is impossible to find two key indicators that can guarantee the final fineness of 1.67dtex and the hollowness of about 20% at the same time, the produced fibers either have a high level of hollowness but the single filament fineness is relatively thick, basically in 3D The above can only be used as filler; or although the fineness reaches 1.5D (ie 1.67dtex), the hollowness can only reach about 10%, such a low hollowness will lose obvious effect on thermal insulation performance

Thereby limiting the expansion of the application of textile fabrics and clothing in high-tech fields

[0004] During cooling and forming, the traditional annular air blowing direction is at a 90° perpendicular angle to the filaments. This air blowing method has its disadvantages for high and high hollow fibers. figure 2 It is a schematic diagram of the trend of conventional ring blowing. After the parallel wind 32 blows in, the tow spun from the spinneret 31 is affected by the power 33 in the drawing direction of the tow. As the wind cuts in, the wind direction will decline, so Due to the change of the blowing point, the temperature difference between the inner and outer layers of the tow is increased, and the cooling position is deviated. Especially for high and medium hollow fibers, the lower freezing point of the inner layer is quite unfavorable for the maintenance and uniformity of the hollowness.

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