How to judge whether the tensile deformation effect of Polyester DTY meets the standard?- Hengke Textile Technology Co., Ltd

To judge whether the tensile deformation effect of Polyester DTY (polyester tensile deformation yarn) meets the standard, we can start from the following aspects:

Physical performance index detection
Curling performance
Curl shrinkage rate: measured by professional instruments, the fiber is heated under a certain tension and its length change rate is calculated. Generally speaking, the curling shrinkage rate of conventional Polyester DTY is about 15% - 30%. If it is within this range, it means that the curling effect is good, and the tensile deformation makes the fiber have better fluffiness and elasticity.
Curl stability: After the fiber has been stretched and relaxed for many times, the degree of curl retention is tested. The curling stability of high-quality Polyester DTY should be high, usually maintained at more than 80%, indicating that the curling structure of the fiber after stretching deformation is stable and not easy to disappear in subsequent use.

Strength and elongation
Breaking strength: tested using an electronic strength meter, the breaking strength of conventional Polyester DTY is generally between 3.5 - 5.0cN/dtex. Too high strength may mean excessive stretching, which makes the fiber hard and brittle; too low strength means insufficient stretching and poor mechanical properties of the fiber.
Elongation at break: Usually, the qualified elongation at break of Polyester DTY is between 20% and 40%. Too large or too small elongation does not meet the requirements. Too large elongation means that the fiber is not stretched enough and has poor elasticity; too small elongation means that the fiber is stretched too much and has insufficient toughness.

Appearance quality inspection
Surface morphology: When observed under a microscope or projector, the fiber surface should be smooth without obvious hair, cracks or unevenness. If there are these problems, it may be caused by uneven tension or improper process parameters during the stretching deformation process.
Curl uniformity: When observed with the naked eye or through optical instruments, the curl of the fiber should be uniform and consistent, without local curling that is too dense or too sparse. Good curl uniformity indicates that the stretching deformation process is stable and the fiber quality is uniform.

Dyeing performance evaluation
Dyeing uniformity: The fiber is dyed and tested. If the color is uniform after dyeing, without obvious color difference or color flower phenomenon, it means that the stretching deformation effect is good, the internal structure of the fiber is uniform, and the dye adsorption is consistent. If uneven dyeing occurs, it may be due to differences in orientation and crystallinity of various parts of the fiber during stretching deformation.
Dyeing rate: Compared with the standard sample, under the same dyeing conditions, the dyeing rate should be within a certain range. If the dyeing rate is too low, it may be that the fiber structure is too tight and the dye is difficult to enter; if the dyeing rate is too high, the fiber structure may be too loose, which may indicate that the stretching deformation effect is not ideal.

Practical application test
Fabric feel: After weaving Polyester DTY into fabric, touch it with your hands to feel its softness, elasticity and fluffiness. If the fabric feels soft, elastic and fluffy, it means that the fiber has a good stretching deformation effect and meets the requirements of clothing or other applications.
Fabric performance: The fabric is subjected to durability tests such as washing, dry cleaning, and stretching to observe its dimensional stability, wrinkling, and elastic recovery ability. If the fabric performs well in these tests, it means that the tensile deformation effect of Polyester DTY is up to standard and can meet various needs in actual use.