Learning Points │Detailed explanations of the causes and preventions of slackness in dyeing and printing products 【Problem analysis】

There are many types of wetting and tapering in dyeing and processing products, which can be roughly classified into the following types.

Such wefts are characterized by the fact that the weft yarns are basically straight, with a slope of about 30° to the horizontal standard. This sort of weft is the difference in the weft yarns that are dragged forward by the tension during the dyeing and finishing process. When the force at the intersections of the longitude and latitudes is different, there is a difference between the weft yarns that cannot move horizontally, and the speed is slower or slower, and the weft yarns are skewed. There are many reasons for this.

Please read the following passage carefully: When the middle is loosened, it will cause wraps during the rope processing, and the open width will be difficult. It is easy to produce linear weft.

b. Sometimes the weaving factory cuts and cuts are not straight, and when the printing and dyeing factory sews the head, it fails to tear and sew, resulting in a weft slack in the sewing head. After post-processing, it is not corrected and the degree of skewness is even greater.

c. When the width is processed, the roller surface is uneven; the roller installation is not horizontal; the roller diameter is different in size and not parallel to each other; the pressure at the two ends of the roller is large; the center line of the machine bed is not straight, causing the fabric to move toward Straight; machine installation quality is poor, local foot loose; part of the tilt, the fabric by the two sides of the force is not uniform; the length of the cloth on both sides of the mercerizing machine mop, resulting in weft; into the fabric suction device mop roller and cloth When the angle is too small, the two sides are not evenly stretched. When the flat film is squeezed, a bubble “water bag” is locally generated; the guide roller bearing is worn or the probe is worn out; the pressure on both sides of the cloth on the cloth inspection machine is different, and the cutting edge of the cloth is not equal. Causes weft.

The public prosecution agency believes that Song Liming knows that his actions will cause physical harm to others, but let the consequences of this happen, resulting in the consequences of the death of others, their behavior has constituted the crime of intentional injury. When the roll is operated improperly, the fabric is wrinkled or curled; the roll cloth is uneven; when the fabric is rolled or rewinded, the east or west flicks or flicks to the left. Secondly, during rope processing, the tension is not uniform, the rollers of the rope washing machine are uneven, and the fabric is not evenly subjected to force. When it is loose, it is easy to cause weft slack; the rope-shaped machine wears overlapping heads, and the cloth does not have uniform force in the longitudinal direction. , Too many cloths are used, the cloth is too tight, and weft is evenly generated. Sometimes the rope washing machine wears a cloth wrap angle that is too large, the tension is large, and the weft slant is also large; local “water bags” are generated in the rope processing and cause irregularities. The slanting slack causes bubble “water bag” to be more obvious when desizing, when the fabric enters the rope shape, the porcelain circle is not centered, and the width is rope-shaped or rope-like, and the distance is too short. The fabric is easy to pack. Rolls are also prone to weft slanting. Large-sized cloth-shaped J-shaped boxes have a large arc at the bottom of the box. It is difficult to slide the fabric, and it is easy to press and cause large tension. After the rope processing, the water is too much to the stacking tank, causing difficulty in opening. Skew is generated.

This kind of weft is characterized by an arcuate or convex bow weft. Mainly occurs on the expansion roller of the bending roller. Due to the fact that sometimes there are small wrinkles before the bending roller or drying cylinder in the flat web, the bending roller is installed to expand the wrinkle. While applying a proper amount of tension to cause the fabric to expand and wrinkle, the weft yarn is also stretched into a convex arch in the middle. The degree of convex curvature is related to the thickness of the fabric, the curvature of the bending roller, and the tension of the fabric on the bending roller. In addition, on the mercerizing machine and on the tenter, the fabrics are held by the fabrics, and the fabrics are loosened after being subjected to hot air, hot or weak alkali leaching, or the alkalis are washed, resulting in hysteresis in the fabrics. Concave curved weft. This situation is easier to produce on thin fabrics.

This kind of weft is characterized by the side of the fabric being skewed on the side V10PJXal40VFFh\x2F. The reason is that the fabric is unilaterally stressed by one corner; or a corner of one roll of the guide roller and the dryer cylinder is accumulated; or the roll cloth of the cloth roll moves to cause the unilateral side to be too thick; or when the roll is multi-pass, the unilateral There is a severe curling, which is mainly due to the difference in pressure between the left and right rollers. This kind of weft is difficult to stop, and only the full width of the weft or the special pressure roller alternates.

This kind of weft is characterized by a locally regular weft. The main reason for this is the accumulation of dirt on the guide roller, such as the winding of the yarn on the top of the yarn, or the wrinkling of the fabric before it enters into the roller, so that the tension is not uniform. Because the dirt or creases on the guide rollers are fixed, the weft-inclined parts and shapes of the fabric are relatively fixed.

The initial weft angle caused by a unit part or a machine table on a web machine is basically a regular or regular pattern, and the position is also fixed. If improper weft or correct weft is not timely, then some parts of the next process machine platform will not be affected normally. This will result in the accumulation of wefts, resulting in intricate and various forms of weft. However, this type of slack is less common.

Latitude if prevention?

In summary, the occurrence of wefts is multi-faceted, and measures to prevent weft must also be initiated from multiple sources.

1, roller, guide roller, drying cylinder must be done almost, that is, roller installation should be flat, the parallelism between the roller should be flat, the roller pressure should be flat. Install the device center line straight, the bottom firmware to be secure. The pins, sleeves, and chains of machines such as mercerizing machines, setting machines, and tenters should be periodically checked and exchanged to ensure that the speed of the fabric or needle plate on both sides is the same. The upper and lower guide rollers for adjusting the speed of each unit of the web machine should be kept horizontal. Rope guide cloth porcelain ring should be adjusted so that the cloth centered. To reduce the tension of the single rope machine, the position of the shift gear is used to move the back of the cloth to a flat cloth to control the number of cloth passages. Reducing the synchronous rotation tension of the rope-like cloth washing machine, the operation line should be straight, and the single-end string equipment can be loosely synchronized with the light guide. To make Brass out of the large J-shaped box without being pressed, the concave weft can take a few bending rolls to expand; the mercerizing machine produces a concave weft, which can be used to add a pair of arcs after the mercerizing machine out of the fabric. Weft shaping device, install a smooth ultra-speed 10% small roller under the cloth, press a square rubber bending roller on the cloth, the center of the bow-shaped projection presses in the center of the cloth, depending on the concave weft of the cloth surface Adjust the pressure of the above curved rubber bending roller so that the concave part of the middle part is evenly adjusted. Generally, the arc can be adjusted to 5-6 cm. When the convex-shaped weft rolls over the bending roller, the convex shape is turned over to complete the weft in the opposite direction, but the degree of the entire weft is limited, and at the same time, the generation of the wrinkle is prevented. Hot air tenter air outlet change the vertical form is inclined air outlet, the wind speed in the 12 ~ 15m / s, the air outlet and the cloth surface angle of 15 ° ~ 20 °, so that the wind along the cloth forward direction of the hair, this can improve the hot air pull The camber weft caused by the web itself.

2, operation. The sewing head should be straight and the needle density should be moderate. It is required to sew the head after the seam as much as possible, and the weft slack of the sewing head should be below 0.5%. The rope-like fabric cannot be knotted and it must be sewn with a sewing machine. The rope processing is finished to the bottom of the stacking tank, and the fabric should be rolled dry so that it cannot carry too much water. To eliminate the "water bag" during rope processing, especially the "water bag" during desizing. Roll cloth to uniform thickness. During processing, fibers and yarns should be prevented from winding around the roller and causing weft. When the width is processed, care must be taken to prevent the curling and wrinkling of the fabric. Electric edger should be uniform on both sides of the force, into the cloth angle to be larger. The code cloth should be flat and straight.

3, strengthen the quality inspection system. The technicians of each vehicle asked to be responsible and responsible for checking the quality of each machine's processed product, and found that the weft was full and timely.

4, to strengthen the management of the entire weft device. We must do maintenance work on the optical and electrical weft correcting devices, regularly check the light source and the mechanical execution, replace the electronic circuit board regularly, and extend the service life of the photoelectric sensors.

The types of slacking and weeping of dyeing and printing products are basically classified into the above types, and the above prevention methods are only some of the small points, practical solutions, or they have to rely on the dyeing and finishing technicians in actual production to explore more according to the actual situation. Find the most suitable solution. Virtuous technical articles are updated daily from time to time.

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