Basic knowledge about polyester yarn composite fabric information

Introduction to polyester FDY/POY/DT/DTY
1. Linear density (i.e. fineness) of polyester filament Linear density is an indicator of the thickness of the filament. Filament is composed of a certain number of monofilaments, so the linear density of filament has two meanings. One is the linear density of multifilament, and the second is the linear density of monofilament. 100D/36F, 150D/36F, etc. These are the expression methods of fiber specifications. The data to the left of the diagonal line indicates the fiber fineness, that is, the linear density of the multifilament. D is the fiber’s fineness unit “denier”, which is expressed in grams of 9000 meters of fiber under standard conditions. For example, 100 grams is 100 denier (100D); the data on the right side of the slash indicates the use of a jet during spinning. The number of holes in the spinneret also indicates the number of single filaments in the yarn of this specification. For example, 36F means that the spinneret used for spinning has 36 holes, that is, the fiber has 36 single filaments. The linear density of a monofilament is left divided by right. For example: 50D/18F iron: 50 denier, 18 holes, iron pipe rolled. 75D/36F paper: 75 denier, 36 holes, packed in paper tubes. 150D/36F cationic: 150 denier 36 holes, cationic to improve dyeing performance. Now another indicator of linear density is decitex (dtex). The weight of 10,000 meters of fiber in grams is called decitex. It is also represented by special numbers. 1 special = 10 special points. The conversion relationship between decitex and denier: 1 dtex=1.1 D If the weight of 10,000 meters of filament is 1.67 grams, the fineness of the filament is 1.67dtex. Fiber decitex (dtex) number = (10000*fiber weight in grams)/fiber length (meter).
2. Large gloss, semi-matt, full matt. In order to eliminate the luster of the fiber, titanium dioxide (TiO2) is added to the melt to reduce the luster of the fiber. If TiO2 is not added to the melt, it will be glossy filament (or large glossy filament), if 0.3% is added, it will be semi-dull filament, and if more than 0.3% is added, it will be full-dull filament.
FDY (Fully Draw Yarm) If stretching is introduced during the spinning process, a winding yarn with high orientation and medium crystallinity can be obtained, which is a fully drawn yarn, referred to as FDY. In addition to the general performance of polyester draft yarn, the product has a network added to the filament bundles, which creates periodic local entanglement and intersection points, increases the cohesion force, improves the bundling properties, and is less likely to produce lint and breakage during weaving; it is uniform. It has good properties, low shrinkage, high heat resistance and thermal stability, small thermal shrinkage, poor hygroscopicity, poor electrical conductivity, and good physical properties. It can be directly used for weaving and is mainly used in the clothing and textile industries.
POY (Pre-Oriented Yarn) The spinning speed of high-speed spinning is 3000~6000m/min. The winding yarn with spinning speed below 4000m/min has a high degree of orientation and is called pre-oriented yarn, referred to as POY. The product has high degree of pre-orientation, stable properties, good mechanical properties, high uniformity and good processing performance. Through processes such as drafting, texturing, and air deformation, products with different properties such as drawn yarn, texturized yarn (DTY), and air-textured yarn can be made into various wool-like, linen-like, and simulated silk products. , suitable for woven and knitting industries.
DTY (Draw Tex-tured Yarn) False twisted textured yarn is called DTY, also known as elastic yarn. DTY network yarn: Network yarn refers to filaments in which the single filaments are entangled with each other and form periodic intersection points under the action of jet airflow in the network nozzle. Network processing is mostly used for the processing of POY, FDY and DTY. The low-elastic network yarn produced by combining network technology and DTY technology has the fluffiness and good elasticity of deformed yarn, as well as many periodicity and network points, which improves the performance of filament yarns. The tightness eliminates several steps in textile processing and improves the ability of the tow to pass through the water-jet loom.
DT (Draw Twist) is called stretched and twisted yarn, and it is relatively flat. DT can be obtained by using POY as raw yarn through a drafting and twisting machine, mainly stretching and giving a small amount of twist. This kind of fiber is divided into two types: high mesh (more than 30 mesh points) and low mesh (10 to 29 mesh points). High mesh is mainly used for warp threads. The advantage is that no sizing or less sizing can be required after warping; low mesh is mainly used on shuttle looms, and the fabric types are taffeta, five-piece satin, Huaguan hemp and decorative fabrics. Silk: Pull out a piece of silk and observe: there is a clustering point every few millimeters. Twist the monofilaments together, pull both ends hard and shake a few times, and the silk thread will loosen again.
AAAFGNHIYIYO