Development of FDY Anti-bending Polyester Filament

The development of FDY anti-bending polyester filaments was used to seal the middle of the process (Jiangsu Hongli Group, Huai'an 223005, Jiangsu, China). Crystallinity. Changes in the initial modulus and other indicators found the best technical conditions and solved the poor flexural resistance of ordinary FDY polyester filaments. It is difficult to cut velvet in weaving. Suede lodging. Uneven. Not plump problem, the test shows that: FDY polyester filament orientation degree 0.12> 0.130 crystallinity of 36% 37% initial modulus of 9 (h 92cN/dtex, the fiber not only has good bending resistance, rigidity will not be too Daiwa fabric feel is not too hard Ordinary FDY profiled polyester weaving process There are problems such as too soft velvet yarn, cut velvet, cut mouth is not uniform, the fabric is easy to lay down the cashmere, uneven feel and visual fullness, etc. affect the fiber's The application, which is caused by the poor bending resistance of the fibers, has been of great concern only for the bending resistance of BCF carpet yarns, and less for the bending resistance of civilian multifilaments. In order to solve the problems, the Jiangsu Hongli Group carried out A large number of equipment reforms have been made. FDY anti-bending polyester filament 1 test has been widely welcomed by the market. 1.1 Raw material instrumentation Chemical fiber company A-grade PET chips. The main performance indicators are shown in Table 1 Table 1 Main Performance Indicators of PET Slices Item Index Item Index Condensation Particles Terminated carboxyl/mr ash,% diethylene glycol, 1.2 major equipment and equipment Zhengzhou Zhongyuan Drying Equipment Co., Ltd. Produce and slice dryer: /h; spinning winder: Dalian Huayang Company and Japan Emperor Graft molding machine equipment, AW909 winding head.

Staimat type extensometer, manufactured by Textechno of Germany; YG086 twist measuring machine, manufactured by Changzhou Second Textile Machinery; Lstei.ni-type Uster Tester, manufactured by Lster Company, Switzerland; 1.3 main process parameters: Qi Quanjing temperature h17a0Cd, drying Temperature dry air dew point is less than or equal to -80匕; spinning speed 140th 1500m/min, spinning temperature 292*C, side blowing temperature 23C, humidity 0.3MPa14 Process drying -> melting -> spinning -> cooling -> oiling One> Extruded one> Heat set one> Network one> Results and discussion of the winding 1 Results of the tensile deformation on the flexural modulus of the fiber The lower the degree of orientation and the lower degree of crystallinity, the lower the initial modulus of ordinary FDY polyester filaments. The main reason for the poor resistance to bending is to use different draw ratios for testing. Take 78dtex as an example. See Table 2 for specific data. Increase the draw ratio, fiber orientation, crystallinity, and initial modulus are significantly larger. The bending resistance is strong; on the contrary, the bending resistance of the fiber is reduced. However, the draw ratio should not be too large and should be less than or equal to 3.5 times. Otherwise, wool and broken ends are added during the drawing process, and the fiber stiffness is too high, making the fabric feel too hard. Also found in the tensile deformation process, Increasing or decreasing the temperature of GR and GR2, only changing the tensile properties and heat setting effects, has little effect on the flexural properties of the fibers. Mainly engaged in polyester. Nylon. Polypropylene filament short filament engineering construction. Production management and new product development.

The crystals produced by the heat treatment are mainly thermally induced crystallized and have little contribution to the initial modulus of the fiber.

Table 2 Effect of draw ratio on fiber orientation, crystallinity, and initial modulus 2 Effect of spinning speed on fiber flexural modulus From the spinning of UDY and POY it can be seen that UDY is a structure Low-orientation, low-crystallinity primary fiber, POY is a highly oriented, low-crystalline fiber, which is mainly due to the spinning speed is different to the technical characteristics of FDY production is directly after the spinning deformation, no doubt, to increase the spinning Silk speed (mainly refers to GR1 speed), the degree of orientation of the primary fiber is increased (mainly orientation of the amorphous area). If other process parameters such as draw ratio are constant, increase the speed of GR1 and GR2, due to the contribution of orientation of the amorphous region, the total fiber The degree of orientation should be increased, and the initial modulus of the fiber should be relatively strong. In this regard, 78dtex was used as an example for comparison tests. The data such as Table 3 shows the effect of spinning speed on the bending resistance of the fiber. Obviously, as the spinning speed increases, the total orientation of the fiber increases, and the degree of crystallinity does not substantially increase. Change, the initial modulus with a small mouth. Therefore, improving the spinning speed is beneficial for improving the flexural resistance of FDY polyester filaments without changing the draw ratio significantly. In addition, the increase of the spinning speed is limited, and it should generally be less than or equal to 4/min.

It was found that changes in spinning temperature and side blowing parameters did not have much effect on the flexural properties of FDY polyester filaments.

23 Product performance FDY anti-bending Polyester filament industrial production raw material consumption is less than or equal to 1.02, product superior product rate is greater than or equal to 90%. Product weaving, cut velvet is very convenient, dyeing and finishing after the velvet is strong and not lodging, and the cloth is flat and full, Feel soft and unique style.

From Table 4, it can be seen that the crystallinity, degree of orientation elongation, strength and modulus of the fiber are superior to those of ordinary FDY filaments. This ensures the fabric's hand and the resistance to bending. Table 4 FDY Flexural Polyester Comparison of main technical parameters of filaments and ordinary FDY polyester filaments Item FDY normal FDY resistance, % crystallinity (density method), % boiling water shrinkage,%3 Conclusion a Degree of orientation Crystallinity, initial modulus is fiber bending resistance The technical key to performance is that FDY polyester filaments have an orientation degree of Q127~Q130 crystallinity of 36%~37% and initial modulus of 90~/dtex is the most suitable for bending resistance. Too small, poor bending resistance; too large, too rigid fiber, fabric feel too b. With the appropriate spinning speed and high-stretching process technology, can be developed more ideal FDY anti-bending polyester filament.

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