1. Color Causes of Natural Colored Cotton
For a long time, people only know that cotton is white. In fact, colored cotton has long existed in nature. The color of this kind of cotton is a biological characteristic, which is controlled by genetic genes and can be passed on to the next generation. Just as different races have black, brown and blond hair, they are all born.
2. Advantages of natural colored cotton
Colored cotton products are beneficial to human health; Reduce the printing and dyeing processes in the textile process; It caters to the slogan of "green revolution" put forward by human beings and reduces environmental pollution; It is beneficial for the country to maintain its status as a textile exporter and break the international "green trade barrier".
The difference between natural colored cotton and pure cotton;
Difference and comparison between colored cotton and pure cotton;
Morphological characteristics Let's first look at the contrast between colored cotton and white cotton of different colors:
Figure 1: Surface morphology of colored cotton and white fiber (magnified 500 times)
Figure 2: Cross section of colored cotton and white cotton fiber (magnified 5000 times)
Fig. 3: SEM photograph of longitudinal morphology of colored cotton and white fiber (magnified 500 times)
As can be seen from the above figure and table, the longitudinal direction of natural colored cotton is similar to that of white cotton, which is flat with irregular turning, thicker in the middle, thinner at the root and thinnest at the top. Fibers with good maturity bend longitudinally and have more turns; The fiber with poor maturity is a thin strip with less crimp number. The cross section of colored cotton fiber is similar to that of white cotton, which is waist-shaped with cells in the middle. The difference is that the cross-sectional area of green cotton is smaller than that of white cotton, that is, it is thinner than white cotton, the secondary cell wall is much thinner than white cotton, and the cell cavity is much larger than white cotton, showing a U-shape. The cross-section of brown cotton is similar to that of white cotton, and the secondary cell wall and cross-sectional area of fiber are fuller than that of green cotton, but the cell cavity is larger than that of white cotton.
: 1. Advantages of colored cotton
Comfort: friendly to the skin, non-irritating to the skin, in line with environmental protection and human health requirements. Anti-static: Due to the high moisture regain of cotton fiber, it can't be pilled by static electricity. Good sweat permeability: absorb sweat and slight sweat on human skin, make body temperature return to normal quickly, and truly achieve the effect of ventilation and sweat absorption. The environmental protection characteristics and natural color of colored cotton meet the taste needs of modern people. Because it has not been chemically treated, some cottonseed hulls remain on some yarns and fabrics, which reflects its feeling of returning to nature. Therefore, product development makes full use of this feature to achieve soft, natural and elegant colors, with leisure as the main style, and then penetrate the popular trend of the season. The image of clothing products is dignified and generous, yet relaxed and natural, while the image of home textiles is warm and comfortable, giving people a feeling of returning to nature.
So generally speaking, the price of colored cotton is a little more expensive than ordinary white cotton.
2. Advantages of pure cotton
Moisture absorption:
Cotton fiber has good hygroscopicity. Under normal circumstances, fiber can absorb water into the surrounding atmosphere, and its water content is 8- 10%, so it contacts human skin, making people feel soft but not stiff.
If the humidity of cotton products increases and the ambient temperature is higher, all the water contained in the fibers will evaporate and disperse, so that the cotton products can keep water balance and make people feel comfortable.
Thermal insulation:
Because cotton fiber is a poor conductor of heat and electricity, its thermal conductivity is extremely low, and because cotton fiber itself has the advantages of porosity and high elasticity, a lot of air can be accumulated between fibers, and air is also a poor conductor of heat and electricity, so cotton fiber products have good moisture retention, and people will feel warm when using cotton products.
Heat resistance:
Pure cotton products have good heat resistance. When the temperature is lower than 1 10℃, only the moisture on the fabric will evaporate, and the fiber will not be damaged. Therefore, pure cotton products are used at room temperature, and washing, printing and dyeing have no influence on the products, thus improving the durability of pure cotton products.
Alkali resistance:
Cotton fiber has strong alkali resistance. Cotton fiber will not be damaged when it is in alkaline solution. This property is beneficial to washing, disinfection and impurity removal after taking. At the same time, cotton products can be dyed, printed and processed by various processes to produce more new cotton varieties.
Health:
Cotton fiber is a kind of natural fiber, the main component is cellulose, and there are a few waxy substances, nitrogen-containing substances and pectin.
Breathability:
Breathability is also a major advantage of pure cotton.
Baidu encyclopedia colored cotton