Journal of Textile Research ›› 2025, Vol. 46 ›› Issue (06): 96-102.doi: 10.13475/j.fzxb.20240804901

• Textile Engineering • Previous Articles     Next Articles

Influence of seed cotton humidification before ginning on cotton processing quality of machine harvested upland cotton in northern Xinjiang

QIN Jianfeng(), SHI Shuwei, MENG Yongfa, LI Menghui, XIA Bin   

  1. Zhengzhou Cotton & Jute Engineering Technology and Design Research Institute, All China Federation of Supply and Marketing Cooperatives, Zhengzhou, Henan 450004, China
  • Received:2024-08-27 Revised:2024-11-19 Online:2025-06-15 Published:2025-07-02

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Abstract:

Objective Moisture regain is one of the key factors affecting the quality of cotton processing. However, during the cotton processing season of the cotton region in northern Xinjiang, China, the amount of precipitation and hence the air humidity is low, and the moisture regain rate of cotton is lower than the optimal moisture regain level, which leads to greater damage to cotton fiber during the processing. To this end, the effects of humidification of seed cotton before ginning on cotton fiber length, length uniformity index and breaking strength were investigated.

Method A machine cotton picking line in Kuitun City was selected, and the second drying unit of the cotton processing line was modified as the moisture conditioning unit. The experiment was conducted with seed cotton picked at the same time in the same field and stored under the same conditions, and the air temperature of the second moisture conditioning unit was used as the test factor. The moisture regain, trash content, cotton fiber length, length uniformity index and breaking strength were used as the cotton processing quality indexes, and the single-factor experimental method was designed to analyze the effect of the factors on the evaluation indexes.

Results There was no significant difference between the control group and the groups with different treatments in the feeding link (p >0.05) and the moisture return rate of cotton after drying (p >0.05). The moisture regain rate of cotton after two humidifications (p <0.001) and that of cotton gathering (p <0.001) were significantly different under different treatments. Compared with the control group, the moisture regain of cotton after two humidification steps was increased corresponding to each treatment level, and with the increase of temperature at the treatment level, the moisture regain got increased. The moisture regain of cotton in the gathering stage also increased with the moisture regain of cotton after the second humidification process, and the increase of moisture regain of cotton after the second humidification process did not fully reflect the increase of moisture regain of cotton in the gathering stage. Different treatments had no significant effect on the impurity content of lint after processing (p >0.05), and the statistical results showed that the trash content of lint did not change regularly with the increase of treatment level temperature. The effect of different treatments on cotton fiber length was significant (p <0.001). The univariate Pearson test showed that hot and humid air temperature was positively correlated with cotton fiber length (r = 0.978, p <0.05). The cotton fiber length increased about 0.397 mm with 1% increase in moisture regain before glint. The influence of different treatments on the cotton fiber length uniformity index after processing was significant (p <0.001). The univariate Pearson test showed that the hot and humid air temperature was positively correlated with the evenness index of cotton fiber length (r = 0.910, p <0.05). Length uniformity index increased by about 0.637%. The influence of different treatments on the specific breaking strength of lint fiber after processing was significant (p <0.001). The univariate Pearson test showed that the temperature of hot and humid air was positively correlated with the breaking strength (r = 0.977, p <0.05). The breaking strength of cotton fiber is increased by about 0.335 cN/tex.

Conclusion For the machine harvested upland cotton production line in the cotton region of northern Xinjiang, the humidification of seed cotton before ginning can improve the moisture regain of cotton ginning and baled cotton, but the moisture regain of cotton ginning is not fully reflected in the increase of moisture return of baled cotton. Under the existing process conditions, the trash content of lint is not affected by increasing the humidification of seed cotton before ginning, and cotton fiber length, length uniformity index and breaking strength are increased, which can reduce the damage to cotton fiber during processing and improve the quality of cotton processing.

Key words: cotton, machine harvested cotton, cotton ginning, humidification, moisture regain, trash content, cotton fiber length, breaking strength

CLC Number: 

  • TS113

Fig.1

Typical 4 sets of 171-type sawtooth ginning machine harvested upland cotton processing line in Kuitun city"

Fig.2

Modified two-pass humidification unit.(a)Atomizer;(b)Moisture regain adjustment device;(c)Moisture regain online detection device"

Tab.1

Statistics of moisture regain of cotton under different treatments"

试样
编号		 喂花环节棉
花回潮率/%		 一道干燥后棉
花回潮率/%		 二道调湿后棉
花回潮率/%		 集棉环节棉
花回潮率/%
均值 标准差 均值 标准差 均值 标准差 均值 标准差
CK 9.12 0.27 6.62 0.13 6.52 0.13 5.87 0.13
T1 9.07 0.31 6.61 0.17 6.85 0.11 5.94 0.17
T2 9.12 0.26 6.53 0.29 7.11 0.11 6.14 0.19
T3 9.09 0.34 6.67 0.25 7.36 0.22 6.22 0.12
T4 9.14 0.37 6.42 0.18 7.65 0.16 6.60 0.24
T5 9.11 0.24 6.37 0.38 8.20 0.33 6.80 0.09
T6 9.16 0.29 6.61 0.29 8.58 0.22 6.94 0.11

Tab.2

Statistics of lint trash content under different treatments"

试样
编号		 集棉环节皮棉含杂率/%
均值 标准差
CK 1.74 0.41
T1 1.72 0.46
T2 1.73 0.36
T3 1.89 0.41
T4 1.58 0.58
T5 1.69 0.52
T6 1.99 0.26

Fig.3

Statistical results of cotton fiber length in control and different treatments"

Fig.4

Statistical results of cotton fiber length uniformity index in control and different treatments"

Fig.5

Statistical results of breaking strength in control and different treatments"

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