Sizing rate is the most important indicator in the warp sizing process and is also one of the core contents of process design. The timely, comprehensive and accurate sizing rate test data is useful for controlling the production process, adjusting process parameters and formulas, and guiding production. Significance. At the same time, controlling the uniformity of the sizing rate will also prevent surface color differences caused by large differences in sizing. Different fabrics have different sizing process requirements.
Important indicators to measure whether a sizing process parameter configuration is reasonable: sizing elongation, slurry penetration rate, coverage rate, sizing film integrity rate, hairiness reduction rate, sizing enhancement rate, grinding increase rate, Stretch reduction.
1. The main function of sizing
Enhance the wear resistance of the yarn, cover the hairiness of the yarn, and allow the slurry to penetrate into the fiber to increase the yarn breaking strength and maintain the original yarn elongation as much as possible.
Excessive sizing rate can easily cause the yarn to break during the weaving process, resulting in a waste of sizing. The denim produced will also have a poor feel, rough fabric, and unclear texture; The weaving process produces a lot of dust. Therefore, without affecting
weaving, the sizing should be kept small, and the opening of the loom does not necessarily have to be very clear.
If the sizing is too small, it will be difficult to weave. If the yarn hairiness is not restrained well, cotton balls will easily form. If the yarn strength is not reached, the yarn will break easily.
2. Slurry concentration and viscosity
Generally, slurry concentration It is directly proportional to the viscosity. The slurry has a high concentration and is not easy to penetrate. It is mainly covered and the enhancement is small. The slurry concentration is small, the permeability is good, the serous film is small, and the wear resistance is small.
3. Slurry temperature
The slurry temperature is high and the slurry fluidity OK, the permeability is good.
4. The influence of grouting roller on sizing
For hydrophobicity For fiber, the first side pressure roller is used to remove the air inside the yarn, and the second and third side pressure are used for sizing. The pressure of the sizing roller is large, the permeability is good, and the coating is poor. At the same time, the yarn tension inside the sizing tank should not be too large, otherwise, the yarn will not be easily soaked.
5. The influence of sizing machine speed on sizing
Sizing The yarn speed is fast, the pressure is high, the extrusion time is short, and the sizing is large; the sizing speed is slow, the extrusion time is long, the sizing residue is small, and the sizing is small, so the speed needs to be kept consistent.
6. Sizing process for different yarn counts
(1 ) The sizing rate can be appropriately reduced for medium-thick yarn counts below 10. Thick yarn sizing is mainly for coating, and the size can be controlled between 7.5-10. The parameters are as follows:
Specifications: C10 bamboo*T/C65/35 21/40D 88*59 51/52
Slurry formula:
Wax Tablets: 4 kg;
Modified starch: 100 kg;
Solid propylene: 8 kg;
Volume (cm from top): 25;
Solid content (%): 9.0;
Slurry Viscosity: 7.0±0.5;
Sizing rate (%): 7.5-10;
Middle zone pressure: 3.6;
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Center tension: 1.0-2.2;
Sizing roller pressure: front 1.6-2.0, rear 3.0;
Sizing side roller pressure: 2.5;
Unwinding tension: 120;
Rewinding tension: 240;
Dyeing drying cylinder temperature: 110-120;
Sizing drying cylinder temperature: 120-135;
Dry area tension: 1.5-2.5;
Yar support roller pressure: 2.2-3.0.
(2) The sizing rate of yarns from 12 to 16 is controlled at 8-11, and the parameters are as follows:
Specifications: C16 ring+12 bamboo*16 ring 82*53 59/60
Sizing formula:
Sizing grease : 4 kg;
Modified starch: 100 kg: Solid propylene: 6 kg;
Volume (cm from top): 38 ;
Sizing roller pressure: front 1.6-2.0, rear 3.0;
Solid content (%): 9.5;
Slurry viscosity: 6.5±0.5;
Slurry tank and drying cylinder route: double;
Sizing rate (%): 8-11;
Middle zone pressure: 4.0;
Middle zone tension: 1.0- 2.2;
Unwinding tension: 1.5-2.5;
Winding tension: 2.0-2.5;
Dry area tension: 1.5-2.5;
Yar support roller pressure: 1.5-2.0;
Dyeing drying cylinder temperature: 110-120;
Sizing drying cylinder temperature: 120-135.
(3) The sizing rate of yarns with a count of 16 to 20 is controlled at: 8.5%-11.5%, and the parameters are as follows:
Specifications: (20 rings + 20 bamboo) 32 with cotton*T/C80/20 30/40D 113*73 45/46.
Slurry formula:
8161: 50 kg;
8163: 50 kg;
Volume (Cm from top): 40;
Sizing roller pressure: front 1.6-2.0, rear 3.0;
Solid content (%): 9.0;
Slurry viscosity: 6.5±0.5;
Sizing drying cylinder route: double;
Sizing rate (%): 8.5-11.5;
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Middle zone pressure: 4.0;
Middle zone tension: 1.0-2.2;
Unwinding tension: 1.5-2.5;
Winding tension: 2.0-2.5
Dry area tension: 1.5-2.5;
Yarn support roller pressure: 1.5-2.0;
Dyeing drying cylinder temperature: 110-120;
Sizing drying cylinder temperature: 120-135.
(4) The sizing rate of high-count yarns should be controlled at a larger level, such as JC30 and JC32 cotton yarns. The sizing rate should be controlled at 10%-12%. The parameters are as follows:
Specifications: JC30 ring*30/40D 138*71 50/52.
Slurry formula:
CD-DF333 100kg;
CD -PW100 10 kg;
Volume (Cm from top): 32;
Sizing roller pressure: front 25kN, rear 15kN;
Solid content (%): 12.5;
Slurry viscosity: 6.5±0.5;
Sizing tank and drying cylinder route: double;
Sizing rate (%): 10-12;
Put Material tension: 2.5-3;
Sizing drying cylinder temperature: 120-135;
Dry zone tension: 2200-3000 ;
Winding tension: 2500-3200
Yarn support roller pressure: 2.2-3.0;
Immersion and pressure method: double immersion and double pressure.
7. Sizing process of yarns with different structures
(1) The sizing rate of air-jet spinning needs to be controlled smaller than that of ring spinning. , the parameters are as follows:
Specifications: C10 units + 7 units + 8 bamboo * 9 B 67 * 50 59/60.
Sizing formula:
Meirui modified starch: 100 kg;
Sizing grease: 4 Kilogram;
Volume (Cm from top): 21;
Solid content (%): 7.5;
Slurry viscosity: 6.0±0.5;
Sizing rate (%): 7.5-9.5;
Middle zone pressure: 4.0;
Middle zone tension: 1.0-2.2;
Sizing roller pressure: front 2.0-2.2, After 3.0;
Slurry tank drying cylinder route: double;
Discharging tension: 1.5-2.5;
Winding tension: 1.5-2.0;
Dyeing drum temperature: 110-120;
Sizing drying cylinder temperature: 120-135;
Dry zone tension: 1.5-2.5;
Yar support roller pressure: 2.2-3.0.
(2) Compactly spun cotton yarn, because the yarn structure is relatively compact and the slurry fluidity is better, to ensure the permeability of the slurry, the parameters are as follows:
Specifications: C14 ring compact spinning + 14 bamboo compact spinning*14/70D 126*56 48/49.
Slurry formula:
8161: 75 kg;
8163: 25 kg;
Volume (Cm from top): 22;
Sizing roller pressure: front 25kN, rear 15kN;
Solid content (%): 10.5;
Slurry viscosity: 6.5±0.5;
Slurry tank and drying Barrel route: double;
Sizing rate (%): 7-10;
Discharging tension: 2.5-3.0;
Sizing drying cylinder temperature: 120-135;
Dry zone tension: 2200-3000;
Winding tension: 2500-3200;
Yarn carrier roller pressure: 2.2-3.0.
(3) High-quality and low-twist cotton yarn. Because the yarn hairiness is long and the twist is low, the sizing rate needs to be controlled larger. The parameters are as follows:
Specifications: C (12 rings + 12 bamboo) high with low twist*14/(75D CM800+40D) 90*57 51/52.
Sizing formula:
Sizing oil: 4 kg;
Meirui modified starch: 100 Kilogram;
Solid propylene: 6 kg;
Volume (cm from top): 46;
Solid content (%): 10.5;
Slurry viscosity: 6.5±0.5;
Sizing rate ( %): 8-11;
Middle zone pressure: 2.8;
Middle zone tension: 1.0-2.2;
Sizing roller pressure: front 1.6-2.0, rear 3.0;
Sizing tank drying cylinder: single;
Unwinding tension: 100;
Winding tension: 2.0-2.5;
Dyeing drum temperature: 110-120;
Sizing drying cylinder temperature: 120-135;
Dry zone tension: 1.5-2.5;
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Yar support roller pressure: 1.5-2.0. </p
