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Method for curling para-position aramid short fibers

A para-aramid fiber and crimping technology, applied in textiles and papermaking, can solve the problems of high energy consumption, slow heating, difficult to increase steam pressure, etc., and achieve good crimping performance, simple and efficient process, and energy saving. Effect

Active Publication Date: 2013-02-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current synthetic fiber production equipment, steam heating is used in the high-temperature steam preheating box. It is difficult to increase the steam pressure and keep the temperature above 340°C, and it is difficult to meet the requirements for the temperature of the tow. The temperature can only be further increased after the water in the beam evaporates, which will inevitably lead to problems such as slow temperature rise and high energy consumption.

Method used

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  • Method for curling para-position aramid short fibers
  • Method for curling para-position aramid short fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: 90 para-aramid filaments of 1000D / 500f are assembled into a large tow of 90,000 deniers, and the large tow is soaked in a hot water bath at 90°C for 6-30 seconds, and fed through a crimping machine. The input wheel is sent into the stuffing extrusion type crimping tank for crimping, and the crimping tank does not need to be equipped with a heating device. The main and back pressure of the crimping machine are 0.32Mpa and 0.25Mpa respectively. The speed of feeding the tow into the crimping box is controlled by the speed of the feeding wheel of the crimper to 70m / min. The crimped tow is evenly laid on the hot air Dry it in a drying oven at a temperature of 100°C, and then send it to a cutting machine for cutting after adjusting the tension. The crimp properties of the obtained para-aramid staple fibers are shown in Table 3.

Embodiment 2

[0025] Example 2: 133 para-aramid filaments of 750D / 500f are assembled into a large tow of 100,000 deniers, and the large tow is passed through a steam preheating box at 95°C and sent by the feeding wheel of the crimper Put it into the stuffing extrusion type crimping tank for crimping, and the crimping tank does not need to be equipped with a heating device. The main and back pressure of the crimping machine are 0.20Mpa and 0.17Mpa respectively. The speed of feeding the tow into the crimping box is controlled by the speed of the feeding wheel of the crimper to 50m / min. The crimped tow is evenly laid on the hot air Dry it in a drying oven at a temperature of 95°C, and then send it to a cutting machine for cutting after adjusting the tension. The crimp properties of the obtained para-aramid staple fibers are shown in Table 3.

Embodiment 3

[0026] Example 3: 96 para-aramid filaments of 1250D / 500f are assembled into a large tow of 120,000 deniers, the large tow is washed with oil in the oil washing tank, and fed into the stuffing extrusion through the feeding wheel of the crimper The crimping is carried out in the press-type crimping tank, and the crimping tank does not need to be equipped with a heating device. The main and back pressure of the crimping machine are 0.35Mpa and 0.21Mpa respectively. The speed of feeding the tow into the crimping box is controlled by the speed of the feeding wheel of the crimper to 30m / min. The crimped tow is evenly laid on the hot air Dry it in a drying oven at a temperature of 130°C, and then send it to a cutting machine for cutting after adjusting the tension. The crimp properties of the obtained para-aramid staple fibers are shown in Table 3.

[0027] Table 3 Analysis of physical properties of para-aramid staple fiber samples

[0028] Sample serial number

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Abstract

The invention discloses a cold-state curling method for producing para-position aramid short fibers. The method comprises the following steps of: bunching aramid filaments, washing by the oil washing of an oil washing tank or hot water bath or a low-pressure steam heat box, and curling the softened aramid filaments in a mechanical stuffing curling box; after curling the aramid filaments, drying the curled fibers in a drying oven at the temperature of between 80 and 140 DEG C; and performing tensioning, and cutting the fibers off in a cut-off machine to obtain the para-position aramid short fibers with high curling performance. According to the method, before entering the curling box, the fibers are not needed to be subjected to high-temperature preheating treatment at the temperature which is higher than the glass transition temperature of 340 DEG C of the fibers so as to soften molecular chain segments, the fibers are not needed to be heated at high temperature in the curling box, and the curled fibers are not needed to be subjected to high-temperature setting of about 340 DEG C.

Description

technical field [0001] The invention relates to a method for processing and producing para-aramid staple fibers, and belongs to the technical field of preparation methods of aramid staple fibers. Background technique [0002] Para-aramid fiber is one of the three major high-performance fibers recognized in the world. The main manufacturers in the world are DuPont in the United States, Aksu in the Netherlands (now incorporated into Teijin in Japan), and companies in Russia. In recent years, due to the country's emphasis on the development of high-performance fibers, the production and application of domestic para-aramid fibers have developed greatly. [0003] In the production of para-aramid filaments, there will be low-grade frets whose indicators do not meet the requirements. Para-aramid is a high-performance fiber and is expensive. Although these low-grade filaments cannot meet the requirements of high-end product applications, However, it still has much higher mechanical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D02G1/00D02G1/20
Inventor 吕洪史利梅谢宏梁济元
Owner CHINA PETROLEUM & CHEM CORP
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