Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (06): 55-60.doi: 10.13475/j.fzxb.20191002606

• Textile Engineering • Previous Articles     Next Articles

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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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

CLC Number: 

  • TS101

Fig.1

Sample capacitor structure and capacitor. (a)Sample capacitor structure; (b)Samplecapacitance"

Fig.2

Dielectric spectra of samples with different moisture contents"

Fig.3

Dielectric constant of different volume fractions of dried samples"

Fig.4

Relationship between volume fraction and dielectric constant of samples at 1 Hz and 1×106 Hz in dry samples"

Tab.1

Relationship between volume fraction and dielectric constant of sample at different frequencies"

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

Fig.5

Relationship between volume fraction of water and dielectric constant in samples"

Fig.6

Relationship between volume fraction of water and dielectric constant at 1 Hz (a) and 1×106 Hz (b)"

Fig.7

Relationship between water content and dielectric constant of sample at 1×106 Hz (a) and 1 Hz (b)"

Fig.8

Relationship between water content and rate of change of dielectric constant per unit mass"

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