The polyester molecules themselves are obtained by polycondensation of carboxylic acids and alcohols in vacuum at very high temperatures. The specific details of the process vary depending on the form of the polyester and the manufacturer, and are often subject to strict confidentiality of the trade secrets. The newly formed polymer is then discharged from the machine in a ribbon form and cooled. Once cooled, the Polyester Filament Yarn is solid. And then cut the solid line into chips.
Polyester is the name of a group of substances. They are all polymers of chemical substances called esters. A polymer is a very long molecule that is made by bonding many of the smaller molecules together, such as a necklace made of beads or a number of trays that make up the train. Because of their very long molecules, some polymers (such as polyesters) form very good strong fibers. So it is used to make polyester filament yarn.
Once the polyester is made into yarn, it can be mixed with other fibers to produce a fabric that combines the quality of both. Polyester filament yarns tend to have high gloss and are coarser, harder yarns. Fabrics such as satin and taffeta are typical filament yarn fabrics. Spinning yarns tend to have matte, matte surfaces, finer yarns, and have a softer feel, because many slender filaments are poked out at the end. If you can see a spun under a microscope, it looks like it has a lot of fine hair on its length. Our fabrics are mainly staple gauze.
Weaving is another way of making fabric from yarn. Weaving from the Neolithic Age has known, perhaps even since ancient times Stone Age. Simply put, the two groups of fibers at right angles to each other are intertwined. The vertical fibers are called warp yarns, stretched and held in parallel by looms. Weft yarns are added between them, one line at a time. They are used for windproof and waterproof fabrics as well as fabrics that are not expected to be stretched.