纺织学报 ›› 2020, Vol. 41 ›› Issue (06): 55-60.doi: 10.13475/j.fzxb.20191002606

• 纺织工程 • 上一篇    下一篇

基于介电谱的醋酸酯水刺非织造布含水率估算

吕汉明1(), 王翔宇1, 刘凤坤2   

  1. 1.天津工业大学 纺织科学与工程学院, 天津 300387
    2.中国纺织信息中心, 北京 100025
  • 收稿日期:2019-10-14 修回日期:2020-03-15 出版日期:2020-06-15 发布日期:2020-06-28
  • 作者简介:吕汉明(1970—),男,副教授,博士。主要研究方向为数字化纺织。E-mail:lvhanming@tiangong.edu.cn
  • 基金资助:
    国家自然科学基金项目(51003075);国家自然科学基金项目(51403152)

Estimating water content of acetate fiber spunlaced nonwovens with dielectric spectroscopy

LÜ Hanming1(), WANG Xiangyu1, LIU Fengkun2   

  1. 1. School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
    2. China Textile Information Center, Beijing 100025, China
  • Received:2019-10-14 Revised:2020-03-15 Online:2020-06-15 Published:2020-06-28

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摘要：

为估算醋酸酯水刺非织造布含水率,测试了不同体积分数与不同含水率醋酸酯非织造布的介电谱,分析了干燥醋酸酯非织造布的体积分数以及非织造布中水分的体积分数对其介电常数的影响,并建立了单位质量醋酸酯非织造布介电常数变化率与含水率的关系。实验结果显示:在干燥状态下醋酸酯的介电常数对电场频率不敏感,醋酸酯的体积分数与其介电常数都存在显著的线性关系;在非织造布-水两相集合体中水分的体积分数与其介电常数呈指数函数关系,在电场频率为1 Hz和1×106 Hz时含水率与其介电常数之间为指数函数关系,试样的含水率与其单位质量介电常数变化率之间存在幂函数关系。

关键词: 醋酸酯水刺非织造布, 含水率, 介电谱, 三段烘燥法, 介电常数

Abstract:

In order to estimate the moisture content of acetate spunlaced nonwovens, the dielectric spectra of acetate nonwovens with different volume fractions and different water contents were tested. The effect of the volume fraction of dry acetate nonwovens and the effect of the volume fraction of moisture on its dielectric constant were analyzed. And the relationship between the dielectric constant change rate of the unit mass acetate nonwoven and the water content was established. The experimental results show that the dielectric constant of dry acetate is not sensitive to the electric field frequency. There is a significant linear relationship between the volume fraction of acetate and its dielectric constant. At the same time, the volume fraction of water in the nonwoven fabric-water aggregate is exponentially related to the dielectric constant. When the electric field frequency is 1 Hz and 1×106 Hz, the moisture content of the sample has an exponential function relationship with its dielectric constant. There is a power function relationship between the moisture content of the sample and the change rate of the dielectric constant per unit mass.

Key words: acetate spunlaced nonwoven fabric, moisture content, dielectric spectrum, three-stage drying method, dielectric constant

中图分类号: 

  • TS101

图1

样品电容的结构与电容器 1—聚四氟乙烯垫圈; 2—镀金铜电极片; 3—样品。"

图2

不同含水率试样的介电谱"

图3

干燥试样不同体积分数的介电常数"

图4

干燥试样1 Hz与1×106 Hz频率下试样体积分数与介电常数关系"

表1

不同频率时干燥试样的体积分数与介电常数的关系"

频率/Hz 拟合曲线 R2
1×106 Y=0.013 80X+0.992 64 0.979 98
8×105 Y=0.013 87X+0.990 51 0.980 49
6×105 Y=0.013 95X+0.989 61 0.980 63
4×105 Y=0.014 04X+0.989 39 0.981 16
2×105 Y=0.014 31X+0.983 66 0.981 33
1×105 Y=0.014 57X+0.981 97 0.981 65
4×104 Y=0.014 73X+0.984 59 0.984 29
1×104 Y=0.015 08X+0.983 50 0.983 23
4×103 Y=0.015 24X+0.984 69 0.984 30
1×103 Y=0.015 42X+0.980 95 0.984 35
4×102 Y=0.015 44X+0.984 29 0.985 22
1×102 Y=0.015 69X+0.982 33 0.986 10
4×10 Y=0.015 42X+0.986 80 0.983 73
1×10 Y=0.015 86X+0.984 00 0.985 21
4 Y=0.015 86X+0.991 38 0.985 23
1 Y=0.018 71X+0.993 29 0.976 54

图5

试样中水的体积分数与介电常数的关系"

图6

水的体积分数与介电常数的关系"

图7

含水率与试样介电常数的关系"

图8

含水率与单位质量介电常数变化率的关系"

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