The physical indicators of polyester filament reflect the physical properties of fibers such as thickness, length, softness, and oil content. By understanding these properties, it is beneficial for product users to choose suitable products based on their own production practices, in order to produce products that meet corresponding standards. Common physical indicators include fiber size, breaking strength, elongation at break%, curl shrinkage H.C.C, boiling water shrinkage BWS, OPU%, etc

Size specifications

Size specifications reflect the thickness, length, softness, and other characteristics of polyester fibers, and are one of the most important indicators for product users when selecting products.

For example, in FDY167dtex/96f, 167dtex represents the thickness of the fiber. The meaning of 1dtex (decitex) is that the weight of silk per 10000 meters is 1 gram, so 167dtex means that the weight of silk per 10000 meters is 167 grams. F represents the number of single fibers in the production of polyester fibers. As in the production process of polyester fibers, except for single fibers, other polyester fibers are composed of many single fibers. In this example, 96F represents that the specification of polyester fibers consists of 96 single fibers, which mainly reflects the softness of the fibers. Generally, the higher the F number, the softer the texture of the products produced. 1 denier (D)=1.11 decibels (dtex), therefore FDY167dtex/96f can also be expressed as 150D/96F. The meaning of 1 denier (D) is that the weight of wire per 9000 meters of length is 1 gram

Breaking strength

Breaking strength is an indicator that measures the maximum tensile force that a fiber can withstand when stretched in a clockwise direction. The strength can directly affect the tearing strength and friction resistance of the finished fabric.

. If the breaking strength of the fiber is too low, it will lead to the phenomenon of fiber breakage during the weaving process, and the tear strength of the woven finished fabric will also be insufficient, thereby affecting the production efficiency and quality of the enterprise. The requirement for fracture strength is generally above 3.0CN/dtex. Under normal circumstances, the fracture strength of FDY and DTY products is roughly between 3.3CN/dtex and 4.2CN/dtex, which can meet the weaving needs

Elongation at break

Elongation at break is mainly used to test the residual proportion of fibers during the clockwise stretching process. Generally, POY products are between 110% -130%; FDY products are between 20% -30%; DTY products are 15% -25%. Generally speaking, fibers with lower residual elongation have better dyeing properties, higher strength, and higher shrinkage rate. Therefore, a lower residual elongation is generally chosen without causing fiber fuzz. Excessive residual elongation can cause DTY to become stiff, FDY is prone to uneven dyeing, and can lead to a decrease in fiber shrinkage, difficulty in setting and wrinkling during dyeing and finishing

Curl shrinkage

In general, if the curl shrinkage is high, the DTY has better relative fluffiness, and the finished fabric surface is relatively rich.

. This indicator can be adjusted by the refueling process. Generally, there are no specific requirements for this indicator of DTY, with low elasticity wires below 20% and network high elasticity around 30%. If the customer has special needs, it is necessary to make corresponding adjustments to the production process

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