Problem description:
Analysis:
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The secondary cell wall of natural colored cotton is much thinner than that of white cotton, but the cell cavity is much larger than that of white cotton. The cross section of green cotton is U-shaped, accounting for about 1/2, and the secondary cell wall and cross section of brown cotton fiber are fuller than that of green cotton, accounting for about 1/3. The net area of white cotton is 1/6. After dyeing, the cells of white cotton are basically filled with dyes. The cell cavity of colored cotton always exists, and sweat and slight sweat can freely discharge and store heat energy through the cell cavity, thus achieving the effects of ventilation and warmth.
Why is cotton colored?
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.
What are the advantages of colored cotton compared with white 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".
Characteristics of colored cotton
Comfort: friendly to the skin, no irritation to the skin, meeting the requirements of environmental protection and human health. Antistatic: Due to the high moisture regain of cotton fiber, there is no static electricity and no pilling. Good sweat permeability: absorb sweat and slight sweat from human skin, make the body temperature return to normal quickly, and truly achieve the effect of ventilation and sweat absorption. After investigation, it is found that the environmental protection characteristics and natural color of colored cotton are very in line with the taste needs of modern people's life, because it has not undergone any chemical treatment. Make the color soft, natural and elegant, and give priority to leisure in 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. Why are colored cotton garments with brown and green as primary colors at present? According to experts' prediction, at the beginning of 2 1 century, brown and green will be the popular colors of clothing. It embodies the trend of ecology, nature, leisure and fashion. Colored cotton clothing except brown and green. Now we are gradually developing blue, purple, grayish red and brown clothing varieties.
Why are the colors of colored cotton clothes not so bright?
There is a layer of wax on the surface of cotton fiber. In the process of printing and dyeing finishing, ordinary white cotton uses various chemicals to remove wax, and the dyes are bright in color and visual contrast, so they are bright. Colored cotton has not been treated with chemicals in the processing process, and still retains the characteristics of natural fibers, thus producing a hazy visual effect, which is not as bright as clothes made of printed and dyed cloth.
Will colored cotton clothes shrink, wrinkle and fade?
Cotton-padded jacket generally has a certain degree of shrinkage and wrinkling. Ordinary cotton-padded jacket can basically avoid shrinking and wrinkling after being treated with chemicals such as resin and formaldehyde. However, "Tiancai" and "Longoria" series of natural colored cotton garments, based on the principles of "health" and "environmental protection", do not need chemical treatment at all, and only adopt physical treatment in the garment finishing process, so that the shrinkage rate is less than the specified standard. If dry cleaning is adopted, wrinkles can be basically avoided. The color of colored cotton comes from natural pigments, and some pigments (green, gray and brown) will be oxidized when exposed to acid. Therefore, acid detergent can't be used to wash colored cotton clothes, and neutral soap or detergent should be chosen.
Why is the price of colored cotton clothes high now?
Colored cotton is a new type of cotton cultivated by modern breeding technology, which meets the requirements of environmental protection and green certification and belongs to high-tech products. At present, the output of the whole international market is very small, and the processing and manufacturing costs are high.
How to distinguish the authenticity of colored cotton clothing?
The most direct method is to soak a piece of colored cotton fabric in washing powder solution at 40℃ for 6 hours (to remove the waxy layer on the fiber surface), wash it with clear water, and observe the color change after drying. If the color is darker than before, it is genuine, otherwise it is fake.
Washing method of colored cotton products
The color of colored cotton comes from natural pigments, and some pigments (such as green, gray and brown) will change when exposed to acid. Therefore, neutral soap and detergent should be used instead of acidic detergent when washing colored cotton products. At the same time, pay attention to dissolve the detergent evenly before soaking the clothes in it. Environmental protection: the color of colored cotton grows naturally, there is no need for printing and dyeing in the processing process, and there is no harmful chemical residue in the fabric, which protects the environment and is beneficial to human health.
Colored cotton knowledge
The ancestors of cotton had colorful fibers, not all of which were white. Color is the biological characteristic of cotton itself, and the physiological mechanism of fiber color is that some pigment bodies are deposited in the lumen cells of its single fiber during the formation and growth of fiber cells. 18 19 in Jiangsu and Zhejiang provinces of China, purple cloth is planted and exported to Europe. Historically, colored cotton was not suitable for the requirements of textile industry because of its small output and short fiber, and it was difficult to be directly used in production. Environmental protection in 2 1 century has become the theme of all mankind. The major cotton-producing countries in the world are stepping up the research and development of colored cotton. Xinjiang Tiancai Technology Co., Ltd. seized the opportunity to cultivate new colored cotton varieties with world-leading level by using modern bioengineering technology-"New Colored Cotton 1" and "New Colored Cotton No.2", which were approved and named by Xinjiang Crop Variety Approval Committee. It is the first new variety of colored cotton approved and named in China. This variety has been widely planted, and the quality of its colored cotton has reached or even surpassed that of upland cotton, which is helpful to break the "green trade barrier" of developed countries and open up a "green channel" for China's textile export.
The story of colored cotton
This is what human beings do-in the course of hundreds of years of evolution, creation and destruction are repeated, becoming the spirit of all things in creation and the source of all evil in destruction-in order to start a new creation. According to historians' research, the history of human domestication and cultivation of cotton has been at least 3700 years. In ancient Egypt 3700 years ago, people knew how to use this magical plant to get warmth. At that time, cotton was not the same color as other animals and plants in nature, but there were many colors, so cotton was originally colored, not white as we see it today. Later, with the continuous progress of human civilization, people's demand for textiles increased greatly, and the requirements for their colors also increased day by day. However, after all, the color of natural cotton is limited, and it is not bright enough. Therefore, people invented dyeing technology to make the fiber have the color people want, so as to produce textiles with various colors, which are bright and bright and more in line with people's needs. In this kind of over-planting, white fiber is of course the best choice for dyeing, which leads people to plant a lot of white cotton instead of cotton of other colors. Gradually, other colors of cotton were abandoned, forgotten and disappeared into people's memory ... In the twentieth century, human history opened a new chapter, the process of civilization was unprecedentedly accelerated, and the problem of environmental pollution became increasingly prominent, which became a major hidden danger that plagued human development in all countries of the world.
The Soviet Union first began to study colored cotton in the early 1950s, and the United States came from the army that used colored cotton in the 1960s. So far, the United States, Egypt, Argentina, India and other countries in the world mainly study and grow colored cotton, and the main colors are brown, green, red, duck egg green, blue and black. The main research method is to find living colored cotton from nature and domesticate it as a parent. At the same time, new varieties are developed by high-tech means such as transgenic technology and aerospace breeding technology. China has a long history of cotton cultivation. During the War of Resistance against Japanese Aggression period, in the revolutionary base area of northern Shaanxi, in order to break the blockade of the Japanese aggressors and reactionaries, a purple-blue wild cotton was planted. In 1970s, Henan, Anhui and other places also planted a small amount of colored cotton for research. It was in the 1990s, especially in the middle and late 1990s, that China formally researched and planted colored cotton on a large scale, which pushed the planting and application of colored cotton to the leading position in the world. The history of mankind has turned a new page, and the future of colored cotton will shine infinitely!
"Black heart cotton" generally includes fibrous industrial waste, medical fibrous waste, regenerated fibrous substances, waste clothes and other waste fiber products. None of these raw materials for processing meet the relevant national standards.
The harm of black-hearted cotton The main harm of black-hearted cotton is that the cotton wool is too short and the raw materials are doped with industrial waste.
Short cotton wool refers to fiber cotton with a length of less than16 mm. Because of its small size and light weight, it is easy to penetrate the fabric of cotton products and float in the air, which may induce asthma, respiratory diseases and other diseases after being inhaled by human body. Industrial waste refers to the leftovers used by textile mills and garment factories in the production process. In addition, the "regenerated cotton wool" processed from old clothes, waste cotton tires and other domestic wastes is generally included in the ranks of industrial wastes. This inferior cotton product is likely to become a "hotbed" of bacteria because it has not been strictly disinfected. People's skin will come into contact with different degrees of * * *, ranging from erythema and itching to psoriasis and other skin diseases.
How to Identify Black Heart Cotton There are several simple ways to identify the quality of fiber products (cotton tires, cotton pads, pillow cores, etc.). ) hit the ball.
High-quality cotton is white, feels good, and has a certain elasticity when pulled gently, while "black cotton" looks impure and feels rough.
High-quality cotton has no pungent smell when burning, while "black cotton" has obvious pungent smell.
If the cotton tire is made of chemical fiber, then its raw material should be produced by chemical fiber factory. This normal chemical fiber is generally uniform in color, with a certain length (generally 20 mm), without too much dust, good elasticity and no odor. If the cotton wool is mixed in color and even contains yarn ends and rags, it is likely to be inferior "black heart cotton" produced by secondary processing of industrial waste.