The development of FDY anti-bending polyester filaments was sealed in the process of the process (Jiangsu Hongli Group, Huai'an 223005, Jiangsu). Crystallinity. The variation of the initial modulus and other indicators found the best technical conditions and solved the poor bending resistance of ordinary FDY polyester filaments. It is difficult to cut velvet in weaving. The suede is falling down. Uneven. The problem of not fullness, the test shows: FDY polyester filament orientation degree 0.12>0.130 crystallinity up to 36%37% initial modulus up to 9 (h 92cN/dtex, the fiber has good bending resistance, rigidity is not too Dahe fabric feels not too hard. In the process of FDY special-shaped polyester weaving, there are problems such as soft fluff, difficulty in cutting, uneven cutting, easy flocking of fabric surface, uneven feel of suede and lack of visual obscurity. Application, this is due to poor fiber bending resistance. People have only paid great attention to the bending resistance of BCF carpet wire, but have little research on the bending resistance of civilian multifilament. To solve the problem, Jiangsu Hongli Group carried out A large number of equipment transformation, developed a well-received FDY anti-bending polyester filament 1 test 1.1 raw material Yizheng chemical company A-grade PET section, the main performance indicators are shown in Table 1 Table 1 PET slice main performance indicators project indicators project indicators agglomerated particles End carboxyl/mr ash, % diethylene glycol, 1.2 main equipment and instruments Zhengzhou Zhongyuan Drying Equipment Co., Ltd. Slice dryer: /h; Spinning and winding machine: Dalian Huayang Company and Emperor of Japan Graft molding machine equipment, AW909 winding head.

Staimat type extensometer, manufactured by Textechno, Germany; YG086 type crepe length measuring machine, Changzhou second spinning machine manufacturing; Lstei.ni type Uster detector, manufactured by Lster, Switzerland 1.3 Main process parameters 擂泉晶温度h17a0Cd, drying The dry air dew point is less than or equal to -80匕; the spinning speed is 140th 1500m/min, the spinning temperature is 292*C, the side blowing temperature is 23C, the humidity is 0.3MPa14, the process is dry, the first one is melted, the first one is melted 1>Stretching 1>Heat Setting 1>Network 1>Winding 2 Results and Discussion 1 Effect of Tensile Deformation on Fiber Flexural Modulus The orientation degree and low crystallinity are low, which leads to the initial modulus of ordinary FDY polyester filaments being too small. The main reason for the poor bending resistance is tested with different draw ratios. Take 78dtex as an example. The specific data can be seen in Table 2. The draw ratio is increased, the orientation degree, crystallinity and initial modulus of the fiber are obviously large. The bending resistance is strong; on the contrary, the bending resistance of the fiber is lowered. However, the stretching ratio should not be too large, and should be less than or equal to 3.5 times. Otherwise, the filaments and broken ends are added during the stretching process, and the fiber rigidity is too large, so that the fabric feels too hard. In the test, in the process of tensile deformation, Increasing or lowering the temperature of GR and GR2 only changes the tensile properties and heat setting effect, and has little effect on the bending resistance of the fiber. Mainly engaged in polyester. Nylon. Engineering construction of polypropylene filament short yarn. Production management and new product development.

The crystals formed by the heat treatment are mainly thermally induced crystallization, and contribute little 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 As can be seen from the spinning process of UDY and POY, UDY is a kind of structure. Low-orientation, low-crystallized nascent fiber, POY is a kind of highly oriented, low-crystallized fiber, which is mainly due to the different spinning speeds. The technical characteristics of FDY production are direct tensile deformation after spinning, no doubt, improve spinning. Wire speed (mainly referred to as GR1 speed), the degree of orientation of nascent fibers is increased (mainly amorphous region orientation). If other process parameters such as draw ratio are constant, the GR1 and GR2 speeds are increased, due to the contribution of the orientation of the amorphous region, the total fiber The degree of orientation should be increased and the initial modulus of the fiber should be correspondingly strong. In this regard, a comparative test was carried out with 78dtex as an example. The data, as shown in Table 3, Table 3, the effect of the spinning speed on the bending resistance of the fiber. As the spinning speed increases, the total orientation of the fiber increases, and the crystallinity is basically not Change, the initial modulus follows a small force. Therefore, increasing the spinning speed is advantageous for improving the bending resistance of the FDY polyester filament, and the change in the draw ratio is not changed significantly. And the increase of spinning speed is limited, generally should be less than or equal to 4 / min, otherwise there are obviously more filaments and broken ends during spinning.

It has been found that changes in spinning temperature and side blowing parameters have little effect on the bending resistance 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, the product superior product rate is greater than or equal to 90%. When the product is weaved, the cut pile is very convenient, the dyed silk is firm and not lodging, and the cloth surface is flat and full. Feel smooth and unique in style.

It can be seen from Table 4 that the technical indexes such as crystallinity, elongation of orientation, strength and modulus of the fiber are superior to those of ordinary FDY filaments, so as to ensure the hand feeling of the fabric and achieve the purpose of bending resistance. Table 4 FDY anti-bending polyester Comparison of main technical indexes of filament and common FDY polyester filament. Project common FDY anti-bending FDY elongation, % crystallinity (density method), % boiling water shrinkage, %3 conclusion a degree of orientation crystallinity, initial modulus is fiber resistance bending The technical key of performance, the orientation degree of FDY polyester filament reaches Q127~Q130 crystallinity reaches 36%~37%, and the initial modulus is 90~ /dtex. Too small, the bending resistance is not good; too large, the fiber rigidity is too large, the fabric feels too sturdy b. With the appropriate spinning speed and high-stretching process technology, the ideal FDY anti-bending polyester filament can be developed.

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