Technology Update: Test Method For Moisture Regain Of Cotton Fibers
National standard
The test method for moisture regain of raw cotton, GB/T6102.2-2009, was officially implemented in September 1, 2009. In the appendix of the standard, the test instrument XJ130 of cotton fiber moisture regain is stipulated in the appendix as the data appendix. The instrument is the latest intelligent intelligent test instrument for raw cotton moisture regain, which has been greatly changed compared with the previous model Y412B. The main changes are as follows: the measuring voltage of the electric sensor is changed from (360+5) V to DC (90+1); the pressure range of the handle is changed from (735+49) N to (735+30) N; and the temperature and humidity probe is added.
Now we should
instrument
The measuring principle and the factors that affect the measurement results are briefly analyzed as follows:
1 measuring principle
Electrical measurement is based on the relationship between moisture regain and electrical conductivity of cotton.
Moisture regain of cotton
Method.
That is to say, the raw cotton is placed between the two plates of the electrical detector, and the moisture regain of the raw cotton is indirectly determined by the size of the raw cotton current under certain conditions such as the area of the two plate, fiber quality, voltage and pressure.
2 factors affecting test results
According to the measuring principle of the instrument, we can know that there are three main factors that affect the test results, namely, the pressure between two poles, the voltage of the plate, and the quality of the sample.
2.1 the effect of the pressure between the two plates on the test results.
The natural cotton fiber is bulky and the resistance becomes large and unstable. Therefore, a certain mechanical pressure must be applied to keep the tested cotton fiber at a certain density and conduct stability.
Because the pressure between two plates determines the density of cotton fiber, if a certain amount of cotton fiber is small, the density will be large and the conductivity will be strong. Otherwise, the volume will be large, the density is small, and the conductivity will be weak.
In addition, if the specimen between the plates is placed unevenly, the larger the load is, the better the conductive performance will be. Therefore, the moisture regain value should be greater than that of the uniform plate.
During the usual inspection process, cotton samples should be placed evenly to ensure the consistency of the cotton samples between the plates.
2.2 voltage between plates
The voltage difference between the two plates is also different.
The higher the voltage, the smaller the resistance of the tested sample.
The new voltage is changed from original (360+5) V to DC (90+1). There are two main reasons for its analysis. First, although high voltage will measure a more stable current, it will cause safety hazards in the use process. Two, the voltage between the electrodes is very unstable, and there is a big error in the measurement, which can not reflect the reversion rate of the sample.
2.3 sample quality
Test method: cotton fiber with different quality was tested in the same environment to observe the influence of the quality change on moisture regain.
A total of 11 samples were taken from 40~60g with 2G as the unit of mass change. The test conditions were temperature 20 C and relative humidity 65.6%.
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