Polyester fiber is a hydrophobic synthetic fiber. The molecular structure of polyester lacks active groups that can bind with dyes like cellulose or protein fibers. Polyester molecules are arranged relatively tightly, and there are only small voids in the fiber. When it is low, the thermal motion of the molecules changes its position to a small extent. Under humid conditions, polyester fibers will not increase the gap through violent swelling like cotton fibers, and it is difficult for dye molecules to penetrate into the fibers. . Therefore, increasing the degree of plasticization of the fiber will help the dyeing process.
The production of polyester fiber is mainly divided into two major steps: polycondensation and melt spinning. The raw materials for the production of polyester fiber are toluene, xylene and ethylene obtained from petroleum, coal or natural gas. After chemical processing, terephthalic acid or dimethyl terephthalate and ethylene glycol can be obtained. Synthetic fiber polymers can be obtained by processes such as polycondensation. Then, melt spinning can obtain the cooled thread, and then the thread is bundled, stretched, crimped, heat-set, cut, and other steps to obtain the finished product.
Polyester has many benefits, which greatly improves the advantages of fabrics. For example, polyester can improve high-temperature stability, improve low-temperature crack resistance, and increase resistance to external environmental influences. Good elasticity and bulkiness are suitable for the production of all kinds of clothes. It can also be used in industry, medicine and paper industry, and it can be described as versatile.
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