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Compound crystal transition modification method of flax yarn

A compound crystal and modification technology, which is applied in liquid/gas/steam treatment of a certain length of textile materials, textile material processing, textiles and papermaking, etc., can solve problems such as difficult removal, reduced crystallinity, and yarn erosion , to achieve excellent soft performance, improve dimensional stability, and soft yarn

Inactive Publication Date: 2013-12-04
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Liquid ammonia modification has similar effects to alkali mercerizing treatment, such as the disappearance of natural curls, rounded cross section, and smaller inner cavity. Uniformity, the main difference is that the effect of liquid ammonia modification is better than that of alkali mercerizing modification
Domestically, liquid ammonia is used as the modifying medium, and the conventional method of boosting pressure in a closed container—holding pressure—recycling the modified medium in the yarn has a certain effect on the flax yarn, but this method only requires one modification, and the swelling is not complete. The decrease in crystallinity is not obvious, and the dyeing performance has not been significantly improved

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A compound crystal change modification method for flax yarn, in which 5 flax yarns are placed in a closed container, filled with liquid ammonia, and the pressure is boosted in a linear boosting manner, and the boosting rate k satisfies the relational expression Initial boost rate k 0 The pressure is 0.5MPa / min, pressurized to a modified pressure of 1.2Mpa, maintained for 3min, and then instantly released to 0.0012Mpa within 3 seconds at a depressurization rate of 0.5MPa / s. Finally, the modification medium in the flax yarn was removed by high-speed centrifugal spin dehydration, microwave heating and vacuum vacuuming in parallel to obtain the composite crystal modification modified flax yarn. Among them, the high-speed centrifugal rotation speed reaches 120rpm, the rotation time can reach 10min, and the radial draft reaches 2.5mm; the power of a single modified kettle in microwave heating is 1kW; the vacuum is pumped to negative pressure and below. Compared with the mic...

Embodiment 2

[0028]A compound crystal change modification method for flax yarn. 20 counts of flax yarn are placed in an airtight container, filled with liquid ammonia, and boosted in a linear boosting manner. The boosting rate k satisfies the relational expression Initial boost rate k 0 It is 0.8MPa / min, pressurized to a modified pressure of 1.5Mpa, maintained for 5 minutes, and then released to 0.0015Mpa within 3 seconds at a depressurization rate of 0.5MPa / s. Finally, the modification medium in the flax yarn was removed by high-speed centrifugal spin dehydration, microwave heating and vacuum vacuuming parallel evaporation method, that is, the composite crystal modification modified flax yarn was obtained. Among them, the high-speed centrifugal rotation speed reaches 140rpm, the rotation time can reach 10min, and the radial draft reaches 3mm; the power of a single modification kettle in microwave heating is 5kW; the vacuum is pumped to negative pressure and below. Compared with the micr...

Embodiment 3

[0030] A compound crystal change modification method for flax yarn. 80 counts of flax yarn are placed in a closed container, filled with liquid ammonia, and boosted in a linear boosting manner. The boosting rate k satisfies the relational expression Initial boost rate k 0 The pressure is 1MPa / min, boosted to a modified pressure of 1.8Mpa, maintained for 8 minutes, and then released to 0.0018Mpa within 2 seconds at a depressurization rate of 1MPa / s. Finally, the modification medium in the flax yarn was removed by high-speed centrifugal spin dehydration, microwave heating and vacuum vacuuming parallel evaporation method, that is, the composite crystal modification modified flax yarn was obtained. Among them, the high-speed centrifugal rotation speed reaches 140rpm, the rotation time can reach 10min, and the radial draft can reach 3.5mm; the power of a single modified kettle in microwave heating is 10kW; the vacuum is pumped to negative pressure and below. Compared with the mic...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract

The invention relates to a compound crystal transition modification method of flax yarn. The flax yarn is arranged in a sealed container, a modification medium is injected in the container, the pressure is increased to the modification pressure, then the pressure is released instantly, vacuumizing, high speed centrifugation rotation traction and microwaves act jointly, the modification medium is removed, and the compound crystal transition modified flax yarn is obtained. The crystal transition modified flax yarn is larger in hole, lower in crystallinity and is soft, and improves the size stability, softness, dyeing property and the like of products. Through the method of releasing the pressure instantly, the fluffiness and softness of the yarn are largely improved. Through the joint action of vacuumizing, high speed centrifugation rotation traction and microwave radiation, the quality of the yarn is further improved, and the modification efficiency is largely improved.

Description

technical field [0001] The present invention relates to a compound crystal modification modification method of flax yarn, specifically a method of boosting the modification medium to the modification pressure, maintaining the pressure for a period of time, and then releasing the pressure instantaneously, and then adopting vacuum pumping, high-speed Centrifugal rotary drafting and microwave combined action and removal of modified medium flax yarn compound crystal modification method. Background technique [0002] Linen yarn is an important textile raw material among natural yarns. It has the advantages of excellent hygroscopicity, low static electricity, strong warmth retention, anti-corrosion and heat resistance, etc., but there are also defects such as hardness, wrinkling, shrinkage, difficulty in spinning, weaving, and dyeing, which lead to poor wearing performance and are not easy to make high-end products. The vast majority of textile flax yarns are low value-added prod...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06B5/16D06B15/00D06M11/61D06M101/06
Inventor 孟婥黄双孙以泽徐洋
Owner DONGHUA UNIV
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