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Bamboo Fiber Properties And Identification Methods

2010/11/12 10:53:00 66

One

Bamboo pulp fiber

And others

Fiber properties

compare

1.1 comparison of suction, moisture release and cooling properties of bamboo pulp, cotton and polyester

According to the test method of water drying loss rate of fabric, the moisture absorption and cooling properties of bamboo pulp fiber, cotton and polyester were measured by the water droplet diffusion time and diffusion area test method. Table 1.

Table 1 bamboo pulp fiber, cotton and polyester moisture, moisture and cool

Characteristics and comments

Valence method




Suction and moisture release


(delta MR) /%




Contact cold sensation


(Qmax) /W. Cm
^-2

100% bamboo pulp fiber

Eight point nine

0.15~0.16

Bamboo pulp / polyester 50/50

Four point two

0.12~0.14

100% cotton

4.0%~4.5%

>0.11

Polyester / cotton 50/50

0.044~0.045

Polyester / wool 50/50

0.09~0.11

Note: the two indexes of surface suction, moisture release value and contact cold sensation indicate moisture absorption and moisture release.

It can be seen from table 1 that the suction and moisture release of bamboo fiber textile is 2.12 times that of cotton. The moisture absorption of bamboo pulp / polyester 50/50 fabric is close to cotton, indicating that the fabric has high moisture absorption and quick dry property, and its touch is cooler than cotton, wool and polyester fabric.

1.2 comparison of hygroscopicity of bamboo fiber and viscose

The moisture absorption property of bamboo pulp fiber is obviously higher than that of other fibers, which is known as breathing fiber in industry. The moisture regain of bamboo pulp fiber in standard condition is 13%, which is similar to viscose fiber. However, when bamboo pulp fiber is at 20 and 95% relative humidity, moisture regain can reach 45%, moisture absorption speed is very fast, moisture regain is increased from 8.75% to 45%, only 6h.

The moisture regain of viscose fiber at 20 and 95% relative humidity is 30%, and moisture regain is increased from 9.12 to 30%, which needs more than 8h.

1.3 bacteriostasis of bamboo pulp fiber, cotton and viscose

Bamboo fiber has

天然抑菌性，根据AATCC 6538–2002《纺织品消毒技术规范》,对竹浆纤维、棉纤维、粘胶纤维进行测试，其结果见表2。

Table 2 bacteriostatic test of bamboo fiber, cotton fiber and viscose fiber

Fiber types

Bacteriostatic rate /%

Staphylococcus aureus

Escherichia coli

Candida albicans

Bamboo pulp fiber

99.44%

Ninety-nine point one nine

94.09%

cotton

40.10%

Viscose fiber

59.65%

Fifty-eight point three six

75.26%

It can be seen from table 2 that the antibacterial property of cotton fiber is poor, the antibacterial property of viscose fiber is not obvious, and bamboo pulp fiber has good bacteriostatic effect, and its bacteriostatic effect has certain broad-spectrum effect.

1.4 deodorizing effect comparison of bamboo pulp and cotton

Bamboo pulp fiber has a natural odor resistance, mainly fiber contains chlorophyll and chlorophyllin, copper and other odorant substances, these odorant substances through the adsorption odor and oxidation decomposition way to remove odor, in addition, bamboo fiber fast sweat, so that the microorganism's survival environment is poor, also can achieve the effect of deodorization.

The results of comparative experiments are shown in Table 3.

Table 3 Comparison of deodorizing effect between bamboo pulp and cotton

Deodorization rate

swatch

Deodorization rate of ammonia /%

Deodorizing rate /% for acid odor

Original sample

Specimen 1

Specimen 2

Original sample

Specimen 1

Specimen 2

Bamboo cloth

Seventy-five

Seventy-two

Seventy

Ninety-seven

Ninety-two

Ninety-three

Pure cotton fabric

Thirty

Twenty-eight

Twenty-six

Eighty-six

Eighty-two

Seventy-eight

Note: sample 1 is washed for 5 times, and the sample 2 is deodorizing 30 times after washing.

1.5 comparison of heat resistance of bamboo pulp, cotton and viscose

The heat resistance of viscose fiber is higher than that of cotton, while the heat resistance of bamboo fiber is better than that of viscose fiber. The strength change of cellulose fiber when heating is as shown in Table 4.

Table 4 strength changes of cellulose fibers during heating up

fibre

type

Dry fracture strength / (cN/dtex)

20 C

50 C

75 C

100 C

Viscose fiber

Two point two seven

Two point three nine

Two point five five

Two point one four

Cotton fiber

Three point eight

Three point zero five

Two point eight three

Two point six three

Bamboo pulp fiber

Two point two three

Two point three zero

Two point five one

Two point four nine

从表中数据可以看出，当温度由20℃升至75℃时，棉纤维的干断裂强度下降了26%，粘胶纤维的干断裂强度增加了12%，竹浆纤维的干断裂强度增加了13%，说明在75℃时以下时粘胶纤维和竹浆纤维强度的变化相同；当温度由75℃升至100℃时，棉纤维的干断裂强度下降了7%，粘胶纤维的干断裂强度下降了16%，而竹浆纤维的干断裂强度却只下降了1%，其原因在于：1）纤维素中水份消失而引起强度的改变；2）由于大分子间各链节的热运动加剧而引起的强度降低；3）天竹纤维的多孔隙网状结构对热量传导有缓冲作用；4）竹浆纤维、粘胶溶解性和白度比较；4）溶解度：竹浆纤维的溶解度比粘胶纤维要大，竹浆纤维在55.5％的硫酸溶液中的溶解度为32.16％，粘胶纤维为19.07%；5）白度：竹浆纤维白度一般在67%左右，粘胶纤维白度在72%以上。

2 Comparison of cross sections of several fibers

The identification of bamboo fiber has been perplexing the development of bamboo pulp fibers. The main difficulty is the difference from ordinary viscose fibers. The major scientific research institutes in China have also carried out research, such as dyeing method, cell observation method, gas phase spectrum method and liquid chromatography method. No breakthrough has been made. Therefore, the quantitative identification of bamboo pulp fiber is listed as a worldwide problem by industry experts.

We are also committed to the study of this method. After several years' efforts, we have analyzed and summarized the identification criteria of textile materials, and explored the structural differences between bamboo fiber and viscose fiber.

2.1 cross sectional images of viscose fibers from different production enterprises

JJG chemical fiber viscose fiber cross section of Jilin chemical fiber viscose fiber

Hailong chemical fiber viscose fiber cross section Sanyou chemical fiber viscose fiber cross section

Cross-sectional section of high density chemical fiber viscose fiber

From the cross section of each fiber, the cross section shape is similar, the core layer structure is homogeneous, the cross section is smooth, not the pore structure.

2.2 cross sectional picture of bamboo fiber of different specifications of yarn and fabric

0.89dtex cross section 1.11dtex bamboo fiber cross section of bamboo pulp fiber

1.33dtex cross section 1.56dtex bamboo fiber cross section of bamboo pulp fiber

3.33dtex cross section of bamboo fiber cross section bamboo fiber yarn

Cross section of bamboo fiber fabric cross section bamboo fiber T-shirt

Cross section of bamboo fiber underwear cross section bamboo fiber socks

From all fiber cross sections, bamboo fiber has unique skin core mechanism. It seems to have a cavity in the middle, and is not affected by spinning force and dyeing conditions. Compared with viscose fiber, it has unique cross-sectional structure. It can be used as a way to identify viscose fiber and bamboo fiber.