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Modified Fiber Fiber Processing Conditions
Jul 01, 2017

Modified Fiber Fiber processing conditions

Physical modification of physics is mainly in the fiber processing conditions to do a series of changes. Blending, compound and by changing the morphology and other methods to achieve the purpose of modification. Composite and blended only limited to the special field of modification, and change the form of the way, still can not get as natural fiber as the ideal effect, but in the appearance of more intuitive. B. Chemical modification of the chemical modification process is relatively simple, of course, easier to achieve our goal. But its flaw is that the durability is poor. Such as surface treatment, copolymerization (introduction of the third component in the polyester chain), and blending (addition of modified additives during the manufacture of the polymer). At that time, copolymerization and blending were complicated in the process and often affected some of the physical properties of the product. Such as reduced strength.

Clothing in the wearing process, often encountered damp, washing, drying and other changes. In these changes, the fiber material made of clothing sometimes absorb liquid water (often referred to as water absorption), sometimes absorb gaseous water, and sometimes can release gaseous water, so that clothing gradually dry. This ability to absorb and emit gaseous water is called the hygroscopicity of the fibers. The general hygroscopicity is expressed by the moisture regain W (%). As the polyester surface is smooth, the internal molecules are closely arranged, the lack of hydrophilic structure between molecules, so the moisture absorption rate is very small, in the standard atmospheric conditions only 0.4% moisture regain, poor hygroscopicity, summer clothing has a hot feeling, people Feel discomfort.

The most important reason for the absorption of water molecules in the air is that there are hydrophilic chemical groups in the molecular structure of the fibers. In the commonly used fibers, the hydrophilic groups are -OH, -COOH, -NH2, -CONH, -CN and so on several. The stronger the polarity of the hydrophilic group, the stronger the ability to absorb water molecules, the better the hygroscopicity. Of course, the more the number of hydrophilic groups, the stronger the hygroscopicity. In addition, the crystal area of the fiber is neatly arranged because of the molecular arrangement, the gap is relatively small, the water molecules are difficult to enter; and the non-crystalline region is arranged irregularly, the gap is relatively large, the water molecules are easy to enter, so the high crystallinity of the fiber is poor. Some of the water molecules absorbed by the fiber are adsorbed by the surface of the fiber or the internal voids, so the larger the surface area of the fiber, the more water molecules that can be adsorbed. Polyester fiber does not exist inside the hydrophilic group, its moisture only by surface adsorption. Natural fiber in the growth process there are some sugar, gum, these substances have a greater capacity, so the separation of these substances before and after the fiber's moisture absorption capacity is also different.

Usually with 35% cotton and 65% polyester blended. This fabric is mainly made of high count yarn plain weave woven, used for thin shirt cloth, fine cloth, poplin and so on. Polyester cotton cloth commonly known as "really good", it not only to maintain the polyester fiber high strength, good elasticity of the characteristics of recovery, but also with cotton fiber moisture absorption characteristics, easy to dye, wash after the fast dry. Polyester and cotton cloth specifications more, with the original color cloth, color cloth, printed cloth and Se Zhibu, and so on.