Bamboo fibrils are natural bamboo fibers obtained by a combination of physical and chemical methods. Textile fiber made from raw bamboo material through bamboo, steamed bamboo, crushing and decomposition, biological enzyme degumming, carding and other processes. Bamboo fiber has good properties such as moisture absorption, breathability, antibacterial and antibacterial, deodorization and UV protection, and the textile value is very high. At present, there are many varieties of bamboo fibrils, and the physical properties such as length and fineness of bamboo fibrils produced by different processes are quite different, and there is no complete test method for the physical properties test of bamboo fibrils. In this paper, the HVI high-capacity fiber tester is used to test the physical properties of bamboo fibrils quickly and accurately. Through the analysis of the test results, the research is to optimize the production process of bamboo fibrils to produce a balance of physical properties and high spinnability. Bamboo fibrils.
1 concept part
1.1 Bamboo fibrils
It is a kind of cellulose fiber extracted from natural bamboo, which is the fifth largest natural fiber after cotton, hemp, wool and silk. Bamboo fibrils have good gas permeability, instant water absorption, strong abrasion resistance and good dyeability, and at the same time have natural antibacterial, antibacterial, antimony, deodorant and anti-ultraviolet functions. Experts pointed out that bamboo fiber is a natural environmentally friendly green fiber. Bamboo fibril textiles are favored by consumers because they completely replicate the inherent characteristics of bamboo fibrils, and the demand for products has increased year by year.
1.2 Biological enzyme degumming
The pretreated bamboo silk is immersed in a solution containing a biological enzyme, and the biological enzyme further decomposes the lignin, hemicellulose, and pectin in the bamboo filament to obtain the cellulose fiber in the bamboo. While decomposing lignin, hemicellulose, and pectin, a certain amount of enzyme capable of decomposing cellulose is also added to the treatment liquid to obtain finer bamboo fibrils, and the process is called degumming of biological enzymes.
2 test part
2.1 main instruments
HVI1000 large capacity fiber tester.
2.2 Environmental conditions
Temperature: (20 ± 2) ° C, relative humidity: (65 ± 3)%.
2.3 Instrument calibration: Refer to GB/T20392-2007, "HVI1000 Large Capacity Cotton Fiber Tester Calibration Specification (2010 First Edition)" to calibrate the instrument.
2.4 Sample balance: The bamboo fibrils and long-staple cotton and fine-staple cotton samples were placed in a constant temperature and humidity for 24 hours.
2.5 sample test
(1) Refer to GB/T20392-2007 "HVI1000 Large Capacity Cotton Fiber Tester Operating Procedures (2010 First Edition)" to test 14 different types of bamboo fibrils samples. The physical property index test results of sample A and sample 5 are shown in Table 1 and Table 2. The other 12 bamboo fibrils were unable to use HVI test data.
Table 1 Physical properties of bamboo fibrils (sample A) tested in HVI
Table 2 Physical properties of bamboo fibrils (sample 5) tested by HVI
(2) The results of physical properties of long-staple cotton and fine-staple cotton using HVI under the same conditions (same environment, same instrument, same tester, same test method) [1] are shown in Table 3 and Table 4.
Table 3HVI test cotton fiber (long-staple cotton) physical properties
Table 4HVI test cotton fiber (fine cotton) physical properties
3 data analysis
3.1 The physical properties of bamboo fibrils are compared with the physical properties of cotton fibers [2]; in Tables 1 and 2, the micronaire value (Mic), reflectance (Rd), yellow depth (+b), average length of the upper half (Len2), length uniformity index (Uui), staple fiber index (Sfi-C), fracture specific strength (Str), elongation at break (Elong), maturity index (Maturity) and other nine physical performance indicators were compared Analysis, the comparison of various physical performance indicators are shown in Figure 1 and Figure 2.
Figure 1 Comparison of physical properties of bamboo fibrils (sample A) and cotton fibers (long staple cotton)
Figure 2 Comparison of physical properties of bamboo fibrils (sample 5) and cotton fibers (fine cotton)
It is found from Fig. 1 and Fig. 2 that the physical properties of bamboo fibrils (sample A) and long-staple cotton are similar, while the bamboo fibrils (sample 5) are similar to the physical properties of fine cotton (3). Among the nine physical performance indexes tested by HVI, the five physical performance indexes such as micronaire value, length, fracture specific strength, elongation at break and maturity coefficient are basically close, especially the length indicators are almost equal; Rd, +b, There are four physical performance indicators such as length uniformity index and short fiber index, but the overall trend of physical performance indicators is basically the same.
4 Conclusion
(1) The physical properties of bamboo fibrils produced under the two process conditions are close to or similar to the physical properties of cotton fibers (long-staple cotton, fine-staple cotton), especially the length indexes of the two fiber HVI test results are quite consistent. Therefore, the bamboo fibrils (sample A and sample 5) have good textile properties.
(2) Bamboo fibrils produced by other processes cannot use HVI to test physical performance indicators. Therefore, in the bio-enzyme degumming process of bamboo fibrils, the feasibility of obtaining the physical properties of textile fibers (similar to sample A or sample 5) can be ensured by controlling the amount of bio-enzyme added to optimize the production of bamboo fibrils. Process to improve the spinnability of bamboo fibrils.
(3) Since the physical properties of bamboo fibrils are still in the research stage by using HVI, it is not excluded to test the physical properties of various bamboo fibrils by improving the test conditions and the possibility of forming mature test methods or work instructions.
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