Suntech Jacquard rapier looms significantly improve textile efficiency
With the improvement of human living standard, the demand for textile products with diversified colors and patterns, innovation, delicacy and quality is getting higher and higher, which depends on the quality of the textile fabric itself, so the weaving process is especially important in the textile production process.
In the weaving process, in order to meet the demand for pattern and color, jacquard rapier loom is an essential textile equipment, but in actual production, there are often problems such as rapier loom stoppage, which affects textile quality and efficiency. On the machine, the loom efficiency is very low, only 60 % on average, weft stop more times, warp stop times also more than conventional varieties, the reasons for the analysis are as follows.(try suntech rapier loom)
1. The influence of fabric organization structure
As can be seen from the fabric pattern and pattern board diagram, weaving a number of weft satin cycle to be transformed into weaving warp satin, the junction of the pattern must be grouped yarn from four under one up into four on one, the heald frame to lift the warp yarn more, the friction between the yarn increases, hairiness increases, so that the warp yarn sticking caused by unclear opening, affecting the smooth passage of weft yarn, so that the loom stops. The number of heald pages is the maximum number of 15 heald pages for this weaving machine, so the clarity of the opening is also affected. In addition, the species for three weft fabric, a shuttle at the same time into three weft, three weft yarn tension is consistent directly affect the weft yarn flight process, three weft on the hair and the chance of defects is also much greater than in a single weft, causing the chance of stoppage also greatly increased.
2. The influence of fabric density
The fabric warp density, coupled with the high speed of the air jet loom, on the machine tension, in the process of high-speed weaving, the warp and warp yarn and warp yarn and the back beam stop warp sheet heald steel box between the contractual friction increases, will lead to yarn hairy increase loss, it is easy to cause unclear opening and trip weft, warp yarn breakage also increased and lead to stop.
3. Influence of the preparation process before weaving
( 1) Because of the three weft, the yarns should be well together before weaving. When the yarn tension is different or one yarn is separated from other yarns when winding, it is easy to cause the weft yarn to form off-loop head breakage on the cylinder and stop the machine.
(2) The sizing rate of warp yarn is small and the yarn is hairy. The sizing film is not strong enough and not wear-resistant, which will easily cause an increase in the pulp of blocking, a decrease in yarn strength and warp yarn breakage.
4. Unreasonable sizing parameters
In order to make the opening clear, the warp tension is often too high, resulting in increased warp breakage.
Measures to improve the efficiency of the loom
From the above analysis, it can be seen that the main reason for stopping the table is the influence of warp and weft yarn strength and hairiness, although the fabric organization structure and density also have a greater impact, but this reason can not be eliminated, so the main measure is to improve the yarn yarn force to reduce hairiness improve the quality of finished cattle reasonable on the machine process.
1. Improve the quality of yarn
According to the above analysis, improve yarn quality is mainly to improve the yarn strength and reduce the hairiness of yarn. The following measures are taken in the spinning process: (1) improve the cotton distribution grade, control the short lint rate of cotton distribution, combing process to control the cotton drop rate at about 18 %, to ensure that the short lint rate of combing strips does not exceed 6 %, to reduce yarn hairiness lay a good foundation ° (2) appropriate to increase the twist of the yarn, improve yarn strength, while the spinning process to use the collector, effectively reduce yarn hairiness.
Single yarn strength is controlled above 21 cN / tex, single strength unevenness is controlled at 8 % to 9 %, elongation at break is greater than 5.5 %.
2. Improve the quality of preparation process
(1) Winding
The winding speed is proportional to the hairiness of the yarn, and the higher the speed, the more hairiness. Therefore, in order to reduce the hairiness of the weft yarn, the speed of the winder should be low to ensure normal production. The tension of the winding yarn is consistent to ensure that the difference in tension between each cylinder yarn is small. The tension of the three weft yarns is evenly increased by increasing the winding tension appropriately to ensure good formation of the cylinder and reduce the phenomenon of uncoiling when drawing in the weft. The yarn channel is smooth and burr-free during yarn merging. Check the sensitivity of the electric clearing, and strictly control the yarn defects.
(2) Sizing
Increase the sizing rate, the sizing rate should not be lower than 18 %, and increase the proportion of PVA to ensure the strength of the sizing film.
Strictly control the difference of sizing rate between upper and lower plies: test the sizing rate of upper and lower plies regularly to ensure that the difference of sizing rate between upper and lower plies is not higher than 0.8% and the difference of sizing rate between left and middle plies is not higher than 05%, so that the warp strength is guaranteed and the yarn is not hairy and the opening is clear.
Regularly test the hardness of the sizing mix, which should not be higher than 75 degrees.
Improve the sizing formula.
3. Reasonable weaving process
(1) Reduce the upper machine tension
Due to the structural characteristics of this product, in order to open the shuttle mouth, so Duo used a large upper machine tension, so that the warp yarn breaks more, after adjusting the spinning process, reduce the yarn hairiness, properly reduce the upper machine tension, not only to reduce the head breakage, but also to make the opening clear.
(2) Adjust the opening and weft time
The opening time and weft guiding time are early, and the working time of the later groups of auxiliary nozzles are extended appropriately to improve the clarity of the bobbin and to ensure that the weft yarn goes down straight and passes through the bobbin smoothly, with the opening time set at 280 and the weft guiding time set at 75°.
(3) Reasonable selection of air pressure of main and auxiliary nozzles
The pressure of the main and auxiliary nozzles should be set between 7.3 tex and 21.9 tex yarn.
The main nozzle pressure is 0.28-0.30 MPa and the auxiliary nozzle pressure is 0.35-0.38 MPa, so that the weft yarn can pass through the bobbin smoothly.
(4) Adjustment of heald frame height and position
This product has more healds and it is not easy to open the shuttle opening, so increase the shuttle opening height and move the frame forward to improve the clarity of the opening. The warp yarn contraction is mainly concentrated between the alternating warp yarns in the upper and lower part of the opening, with a heald frame of 156 r /m in and a daily output of 83. 1 kg per machine.
Suntech rapier jacquard weaving machines are designed to optimize the weaving process by improving the ease of operation, reducing the labor intensity of operation, increasing the degree of automation and intelligence, and improving production speed and efficiency. The applicable width range covers 150, 190, 230 ( 220 ), 250, 280, 320, 340, 360, speed up to 250-400 rpm, with 4,500 stable customers and 15,000 successful cases worldwide, providing installation and commissioning, overseas technical support, 24-hour customer service, 12-month warranty and other after-sales services, welcome to ask for more information.
