① The major varieties of polyester include short fibers, drawn yarns, textured yarns, decorative filaments, industrial filaments and various differentiated fibers.
Because staple fiber is a kind of polyester, staple fiber is also polyester.
②D professional term is denier, which is a density unit of fixed-length system of fine-bundle silk, man-made fiber and nylon textile fiber. It refers to the mass grams of 9000m-long fiber at a given moisture regain, and the unit is denier. Denier is a measure of fiber fineness. 9000m long fiber weighs 600 grams, and this fiber is called 600D fiber. 9000m long yarn weighs 600 grams, and this yarn is called 600D yarn. The larger the number, the thicker the yarn or fiber. Therefore, the larger the D number of polyester, the thicker the yarn count. For example, 16+70D is thicker than 16+50D.

③The polyester you mentioned has many threads, and that thread is the so-called (F) number. Refers to the number of filaments in a bundle of yarnPolyester DTY Yarns manufacturers; that is, the number of spinnerets in the process of producing filaments. Generally speaking, the F numbers are all multiples of 12. For example, 24F 36F 48F 144F 288F looks like this. Most of them are multiples of 12. There are also special fibers that are not multiples of 12. This F number is determined by the mesh number of the spinneret of the equipment. All I have seen so far are multiples of 12. Haha, let me tell you, I happened to analyze a fabric-like polyester 4*30D (FDY) with a 24F count this afternoon! ! !
Polyester staple fiber is a fiber obtained by spinning polyester (ie, polyethylene terephthalate, or PET for short) into tow and cutting. So polyester is also called polyester fiber. Because staple fiber is a thread, its strength is low (of course, compared with filament).
④Supplement: Filament refers to continuous fiber, such as continuous tow ejected from silk and chemical fiber. Usually a dozen or dozens of single filaments are combined and woven together. The fabric has a smooth surface and strong luster. It is often used as summer fabric.
Short fibers refer to fibers with a length of several millimeters to several tens of millimeters, such as natural fibers such as cotton, wool, and hemp, which can also be made from filaments cut. Short fibers must undergo a spinning process to twist and cohere between fibers to form a continuous yarn for weaving. Short fiber fabric has hairiness on the surface, plump and fluffy, and is often used in autumn and winter fabrics.