Printing and dyeing fabric products appear latitudinal rickets, how to prevent it?
The weft is caused by the instability of the fabric production process during high-temperature setting. For example, cotton can be torn by hand, but the natural trace of tearing is not horizontal, but oblique, which is obvious.
Generally, the cloth has a little weft problem, and it does not affect the normal use. Only the lattice, the warp sliver or the weft sliver cannot appear the weft, otherwise the loss is large when the crop is produced, and even the crop cannot be cut.
Product lat.
1, full linear latitude
The characteristic of this type of weft is that the weft yarn is basically a straight line and has a slope of about 30° with the horizontal standard. This kind of weft is the tension of the fabric during the dyeing and finishing process. When the force is large and small at the intersection of the warp and weft, the difference can not be horizontally advanced on the weft yarn, and there is a difference between the speed and the slow progress, which forms the skew of the weft yarn. The reasons for this are manifold.
a. The fabrics from the weaving factory are sometimes tight on one side or loose in the middle of the two sides. When the rope is processed, the wrapping is caused, and the opening is difficult, and the linear weft is easy to occur.
b. Sometimes the weaving factory does not straighten the blanks. When the printing and dyeing factory seams, it can't be torn and seamed, which causes the seams to be wefted. After the post-processing, there is no correction, and the degree of skew is even worse.
c. When the flat-width processing is performed, the surface of the roller is not flat; the roller installation is not horizontal; the diameters of the rollers are different, and they are not parallel to each other; the pressure at both ends of the roller is small; the center line of the machine is not straight, causing the fabric to run without Straight; the installation quality of the machine is poor, the partial foot is loose; some parts are inclined, the fabric is unevenly stressed on both sides; the length of the cloth mop on both sides of the mercerizing machine is different, causing the weft; the cloth suction roller and the cloth The angle is too small, the tension on both sides is uneven; the air bubble "water bag" is generated locally during the flat rolling; the guide roller bearing wears or the probe is worn out; the pressure on both sides of the pressure roller on the cloth inspection machine is different, and the code cloth machine edge is not equal. Causes latitude.
The above situation is that the condition of the equipment is abnormal. If it is not operated properly or is not implemented according to the standard system, it will cause the slanting.
For example, in the process of sewing, it is convenient to tie, easy to knot; when entering the flat roll, improper operation, wrinkle or curl the fabric; the cloth roll is not flush; when feeding or unwinding, Dongpu West oblique or left and right. Secondly, in the rope processing, the tension is not uniform, the roller of the rope washing machine is not flat, the fabric is unevenly stressed, and when it is loose, it is easy to cause the weft; the inside of the rope machine overlaps, and the warp direction of the cloth is uneven. Excessive number of cloths, too tight cloth, evenly producing weft, sometimes the angle of the cloth washing machine is too large, the tension is large, the weft angle is also large; the local "water bag" is generated in the rope processing and causes irregularity. Latitude, the bubble "water bag" is more obvious when desizing, when the fabric is flat into the rope, the porcelain ring is not centered, the flat rope is rope-like or rope-like flat, sometimes the distance is too short, the fabric is easy to pack The roll is also prone to latitude, large J-shaped box, the bottom of the box is large, the fabric is difficult to slide, and it is easy to compact and cause great tension; after the rope processing, it is too much water, which makes the opening difficult. Produces a latitude.
2, full-width curved weft
Such a weft is characterized by an arcuate or concave arcuate weft of the weft.
It mainly occurs on the widening roller of the bending roller. Because of the small wrinkles in front of the flat-feeding bending roller or the drying cylinder, the bending roller is added to expand and wrinkle.
While applying an appropriate amount of tension to expand and wrinkle the fabric, the weft yarn is also stretched into an arcuate shape in the middle. The degree of convex arc is related to the thinness and thickness of the fabric, the curvature of the bending roll, and the tension of the fabric on the bending roll.
In addition, on the mercerizing machine and the tenter, the fabric is clamped and advanced by the fabric. After being washed by hot air, hot alkali or alkali, the fabric is slackened, causing hysteresis in the middle part of the fabric. Concave curved latitude. This situation is more likely to occur on thin fabrics.
3, hanging angle latitude
This kind of weft feature is that the weft yarn is normal on one side of the fabric and skewed on one side.
The reason is: the fabric is unilaterally stressed at one corner; or the guide roller and the drying cylinder are unilaterally covered with one corner; or the cloth roll is moved, and the unilateral side is too thick; or when entering the multi-roller, the single There is a serious curling edge, which is mainly caused by the large difference in pressure between the rolls. Such latitudes are difficult to squash, and only the latitude is alternated by a tenter latitude or a special nip.
4. Local slanting fixed to a certain part of the textile
This type of weft is characterized by a locally regular weft.
The main reason is that dirt is accumulated on the guide roller, such as winding the yarn head strip; or the fabric has wrinkles in front of the roll, so that the tension received is inconsistent.
Since the scale or wrinkles on the guide rolls are fixed, the portions and shapes of the weft of the fabric are relatively fixed. .
5, intricate latitude without regular shape
The primary weft of the fabric on the flat frame caused by the unit parts or the machine is basically a regular or regular shape, and the position is also fixed. If the latitude or the latitude is not timely, and then some parts of the lower machine are abnormally affected, the accumulation of the latitude will be generated, and the intricate and different latitudes will be formed. However, such latitudes are less common.
Measures to prevent weft
The generation of the latitude is multifaceted, and the measures to prevent the latitude should also start from multiple parties.
Equipment: The rolls, guide rolls and drying cylinders on the flat-width equipment must be done in four ways, that is, the rolls should be installed flat, the parallelism between the rolls should be flat, and the pressure of the rolls should be flat.
Install the center line of the device to be straight and the bottom firmware to be strong.
The pins, sleeves and chains of the machine such as mercerizing machine, setting machine and tenter should be checked and exchanged regularly to ensure the same speed of the two sides of the fabric or the needle plate.
The upper and lower guide rollers of the adjustment unit of the flat machine table should be kept horizontal.
The rope guide cloth should be adjusted to center the cloth bundle. To reduce the tension of the single machine of the rope machine, use the mobile distribution gear position, so that the rear head wears the cloth as a flat cloth, and controls the number of cloth passes. Reduce the tension of the synchronous rotation of the rope washer, the running line should be straight, and the single-head rope-like equipment can be loosely driven by the light guide. In order to prevent the large J-shaped box from being pressed, the concave weft can take a few bending rolls to expand; the mercerizing machine produces a concave weft, which can be installed after the mercerizing machine is released. The whole weft device is equipped with a smooth small roller with an active overspeed of 10% under the cloth. A square rubber bending roller is pressed on the cloth, and the center of the arcuate protrusion is pressed at the center of the cloth frame, depending on the degree of concave weft of the cloth surface. Adjust the pressure of the upper curved rubber bending roller so that the concave yarn in the middle part is evenly adjusted, and the arc shape can be adjusted 5 to 6 cm. When the convex slanting and bending the bending roller, the convex shape is turned into the opposite direction to adjust the weft, but the degree of the latitude is limited, and at the same time, the wrinkles are prevented from being generated.
The hot air tenter blower is changed to a vertical air outlet. When the wind speed is 12~15m/s, the angle between the air outlet and the cloth surface is 15°-20°, so that the wind blows along the forward direction of the cloth surface, which can improve the hot air pulling. The curved latitude caused by the web itself.
Operation: The seam should be straight, the needle should be moderate, and the seam should be sewed as much as possible. The seam slant is below 0.5%.
The rope fabric can not be knotted, and the sewing machine should be used to sew the head. The rope processing ends to the bottom of the stacking basin, and the fabric is to be dried and not too much water.
It is necessary to eliminate the "water bag" during rope processing, especially the "water bag" at the time of desizing.
Roller cloth should be thick and even. When processing, avoid the fibers and yarns winding around the roller to cause weft. Care should be taken to prevent the occurrence of edge curling and wrinkles during flat processing. The electric edge absorber should be evenly stressed on both sides, and the angle of the cloth should be larger. The code cloth machine should be flat and straight when it is coded.
Strengthen the quality inspection system
All the car technicians should be responsible and responsible for the quality of the processed products of each machine, and find the latitude and longitude in time.
Strengthen the management of the weft insertion device: Maintain the maintenance work of the photoelectric weft insertion device, regularly check the light source and mechanical implementation, periodically replace the electronic circuit board, and extend the service life of the photoelectric probe.
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