TEST REPORT OF COMPREHENSIVE PROPERTIES OF SOYBEAN PROTEIN FIBERS
The below data has been provided by the Department of Knitting Engineering, College of Textiles, Dong Hua University.
Wet Permeabiltiy and Moisture Vapor Transmission Characteristics
In order to test and compare these two properties of Soybean fibers, 6 jersey fabric samples were knitted with 6 kinds of different yarns, as illustrated in Table 1.
The wicking rates of first 10 min and the wetting areas of 1 min of all samples were tested, and the synthesized values of wet permeability were calculated, as illustrated in Table 3.
Table 3 shows that the synthesized values of wet permeability of PP and PE samples are highest in all the samples. And the synthesized value of wet permeability of Soybean sample is lower than that of PP and PE, but higher than other samples. The sequence of wet permeability of these samples is listed as follows:
The water cup method was used to measure the quantities of permeated moisture vapor through the samples. In the experiment, the environment dry bulb temperature is 35℃, the wet bulb temperature 25℃, relative humidity is 35%, the test time is 2 hours, and the sample area is 32.75 cm2. tested quantities of permeated moisture vapor through the samples are listed in Table 4.
The wet permeability of Soybean is lower than that of PP and PE but higher than PAN, PA and silk; while the moisture vapor transmission property of soybean sample is better than silk, PP, PE, PA, PAN. Therefore, soybean fiber is a kind of comfortable fiber with relatively good wet permeability, excellent moisture vapor transmission property and dry touch.
Warmth retention property
In order to test and compare the warmth retention property of Soybean fiber, 4 jersey fabric samples were knitted with soybean yarn, PAN yarn, cotton yarn and wool yarn, respectively. The parameters of samples are listed in Table 5.
The synthesized values of three heat parameters (warmth retaining rate, thermal resistance and thermal transmissivity) of all samples were tested and calculated, as illustrated in Table 6.
Table 6 shows that, the warmth retention property of soybean-fiber sample is similar with that of cotton sample, which is better than PAN sample but worse than wool sample.
Frictional, flexural and draping properties
In order to test these three properties of soybean fibers, 14 fabric samples were prepared with different yarn materials and different textile structures. The parameters of these samples are listed in Table 7.
The tested data of friction force and frictional coefficient of all samples are liste in Table 8.
The sequence of the frictional property of the above mentioned yarn materials is:
silk > soybean fiber/spandex > cotton > soybean > chrysalis fiber
The fictional coefficient of soybean fiber is just lower than that of Chrysalis fiber, which has the smoothest feeling.
The tested slide length (l) and calculated bending length (C), flexural rigidity (B), and bending modulus (g) of all fabric samples are listed in Table 9.
The sequence of the soft handle property of the above mentioned yarn materials is:
chrysalis fiber > soybean fiber > silk > cotton
The tested drape coefficient, wrinkle number and the subjective assessment of aesthetic feeling of all fabric samples are listed in Table 10.
Grade standard of aesthetic feeling:
with more wrinkles, and the wrinkles are smooth and well-distributed
the level between grade A and grade C
with little wrinkle, and the wrinkles are irregular
The sequence of the draping property of the above mentioned yarn materials is:
chrysalis fiber > soybean fiber> silk
According to the aesthetic principles (the shape of draped fabric with more wrinkles, and the wrinkles are smooth and beautiful), all the 14 fabric samples were assessed subjectively. The results of assessment indicate that the soybean fiber samples (No.7-9) and the Chrysalis fiber sample (No.10) have good aesthetic feeling and drape property.