Texturing Machine Stretch Ratio:
The draw ratio is generally determined by the residual draw ratio of POY, which directly affects the fineness, strength and elongation of the silk. With the increase of draw ratio, the strength of the filament increases, the elongation decreases, the crimp rate is low, and the crimp stability increases. This is mainly because with the increase of the draw ratio, the macromolecules of the fibers are stretched and aligned along the fiber axis, the orientation degree of the drawn filaments increases, and the crystallization of macromolecules is induced at the same time, thereby increasing the strength of the filaments. Due to the increase in the degree of orientation of macromolecules in the fiber at high draw ratios, the possibility of further stretching decreases, so during the drawing process, the ability to be re-stretched decreases; in addition, due to the increase in the draw ratio, the tension High limits the rapid displacement required for the development of fiber crimps, and the fibers are densely crimped, so the crimp rate decreases and the crimp stability increases. If the stretching ratio is too low, the tension is small, and it is easy to fluctuate and slip, resulting in tight twist. Therefore, appropriately increasing the draw ratio within a certain range can stabilize the twisting, the difference between the spindles is small, the A rate of dyeing is increased, and the difference in post-processing can be reduced. For single slender fibers, the stretch should not be too large, and the adjustable range is relatively narrow.

Air-jet texturising process is a purely mechanical method that uses a cold air-stream to produce bulked yarns of low extensibility. The feed yarns need not be restricted to the synthetic filament yarns. The air-textured yarns resemble spun yarns in their appearance and physical characteristics. The air-jet texturising process is by far the most versatile of all the yarn texturising methods in that it can blend filaments together during processing.

1: The draw ratio refers to the low strength, elongation, and unstable macromolecular structure of POY silk without elastication, and it is not suitable for direct weaving. After being stretched by a certain stretch ratio of the texturing machine, the strength of the POY yarn is enhanced, the elongation is shortened, and the fiber structure is stable, which meets the requirements of the subsequent textile and apparel. This is the stretch ratio.

2: The acceleration speed generally refers to the linear speed of the second roller in the several rollers of the texturing machine as the benchmark, commonly known as the acceleration speed, referred to as the “vehicle speed” unit of measurement m/min.

3: Deformation temperature If POY yarn is hard-drawn at low temperature, the surface of the monofilament is prone to fluff or breakage. The deformation temperature is to achieve thermal stretching of the POY yarn under a certain temperature condition set by the texturing machine, so that the POY is fully stretched and deformed, and the fiber is not hairy.

4: False twist tension, also known as deformation tension, refers to the tension value (T1) before the POY yarn enters the false twister along the silk path, and the tension value (T2) before the false twister to the second roller. Known as false twist tension, it is especially important for the quality of DTY.

5: Winding tension control The winding tension of DTY yarn has a great influence on the post-processing. The greater the winding tension, the smaller the diameter of the DTY silk cake and the higher the hardness of the DTY silk cake. On the contrary, the smaller the winding tension is, the larger the diameter of the DTY silk cake is, and the smaller the hardness of the DTY silk cake is.