1. Causes and solutions to problems that may occur during the production process of yarn-dyed fabrics 1 Weaving defects There are Weaving defects in the warp or weft direction appear ...
There are Weaving defects in the warp or weft direction appear regularly or irregularly.
Main reason:
① Use yarn not strong enough.
② Yarn The sizing is poor (light sizing or heavy sizing).
③ Defective weaving equipment (faulty weaving equipment will cause yarn breakage and other problems).
④ Get off the computer The repair of the gray fabric is incomplete.
⑤ The acceptance of finished products is not careful.
Solution: Strengthen repairs.
For woven fabrics and knitted fabrics, 2% weft inclination/weft arc appears, and the sum appears greater than Any cloth with 3% distortion cannot be classified as first-class.
generated main Reason:
① Defective weaving equipment (When the weaving equipment is faulty, it will cause frequent downtimes, resulting in weft skew/weft arc)
② Mainly Refers to weft skew/weft arc caused by poor finishing equipment).
③ Poor organization (Weft skew/weft arc caused by operator’s irresponsibility during finishing).
Solution: Strengthen repair and rearrangement (weft correction).
The warp and weft of the fabric If the shrinkage rate exceeds the specified value, it cannot be classified as a first-class product. Different fabrics will have different ranges.
Main reason:
① Post-finishing bad.
② Poor pre-shrinking device.
Solution: pre-shrink again (within the specified shrinkage rate)/shrink and wash the fabric, etc.
The finished fabric The feel is inconsistent with that of the standard sample, and there is an obvious difference.
Main reasons:
① Poor finishing.
② The raw materials are not correct.
③ Production process Incorrect.
Solution: Reorganize/reproduce.
Fabric (color The color fastness of woven fabrics and dyed fabrics cannot meet the requirements
Main generated Reason:
① Dyeing process bad.
② The dyeing raw materials are defective.
③ Finishing bad.
④ Poor operation . (It is especially obvious when the paint is scratched/stained)
Solution: re-fix the color/re-produce the fabric/re-dye (dyed fabric is ok)/color correction (paint scraping/paint-dyed fabric is ok).
There is an obvious difference between the style of the fabric and the standard sample (slub style/segment dyeing style/thickness, etc.).
Main reason:
① The raw materials are not Correct (slub yarn is incorrect/yarn count is incorrect)
② Incorrect production process (The process of segment dyeing is incorrect/the arrangement of slub yarn or segment dyeing yarn is incorrect)
③ Finishing Incorrect process (when the raw materials and organization are correct, whether the finishing process is correct or not will affect the style of the fabric)
Solution: ① Reproduce the fabric ② Re-organize
1
The wrinkle strips are parallel to each other and flush from head to tail.
The wrinkle strip is large in the middle and pointed at both ends. There is a yarn tail at the junction of the wrinkle strip and the plane, which is shaped like a skirt wrinkle.
The skirt has many wrinkles It occurs on fabrics containing chemical fibers and is not easy to find on original gray fabrics. It is only visible after printing and dyeing processing.
Main reason:
①Chemical fiber itself Differences in performance or inconsistent high-temperature twisting temperatures in textile factories result in different shrinkage rates of weft yarns;
②There is a difference in the number or twist of the weft yarn used.
Solution: Re-cast the original greige clothProduce.
Wrinkle strips and The seams are connected, one or more, with different lengths. Some are at one end of the seam, and some are at both ends of the seam.
The main reason is thatthe stitching of the ground cloth is poor. The seam head is not straight, firm, the edges are neat, and the stitching is even.
Solution: Cut off the seams and do a piece of cloth processing.
Generally in cloth There are not many strips on the surface, usually straight or diagonal strips, varying in length, width and width. The wrinkles produced before printing and dyeing or during the printing and dyeing process have a large color difference from the normal cloth surface; the wrinkles produced during the flat washing process after printing and dyeing have a smaller color difference.
Main reason:
① First half of printing and dyeing The product has original wrinkles;
② During the printing and dyeing process, the mechanical tension and roller pressure are not properly adjusted; the parallelism of the guide roller and drying cylinder Poor control;
③ Prepare for cleaning Not done well.
Solution: Re-production.
After printing and dyeing, there will be thin dead wrinkles that are deep in the middle and shallow on both sides, straight or oblique.
Main reasons:
① Mercerizing machine The cloth guide rollers of the alkali removal steamer and flat washing tank are uneven or stained with yarn ends and alkali scale;
② Mercerizing machine Improper tension adjustment;
③ Opening the direct steam pipe of the alkali removal steamer will greatly impact the fabric and cause wrinkles.
Solution: supplementary production.
The exposed part of the printed and dyed fabric is different from the normal color of the cloth surface. Generally, irregular light-colored stalls or color bars appear at the folds of the cloth or on both sides of the cloth.
Main reasons:
Some printing and dyeing semi-finished products and in-process fabrics used for reactive dyes and disperse dyes contain alkali, or are affected by reducing gases in the air, which affects the fixation of the fabric and the dye, and the exposed parts produce light-colored patches. Reactive Dyes are prone to wind marks
Solution: supplementary production.
The color of printed and dyed fabrics in the middle or left, middle, or right edges remains the same.
generated main Reason:
①Dye solution The roller or printing pressure is inconsistent at both ends;
② When pre-baking or hot melt baking, the middle and both sides of the cloth The temperature and air volume are inconsistent, resulting in inconsistent dryness and wetness on the left and right sides or left, middle and right sides of the cloth;
③Color matching The dye migration properties are inconsistent under the same processing conditions, resulting in changes in color depth or shading.
Solution: Color correction
Border color The color of the fabric is darker or lighter than normal.
Main reasons:
① Curl dyeing When the cloth is rolled, the edges are uneven;
② The curling of the fabric during dyeing causes a shallow edge;
③Border organization Thickness and high liquid content result in deep edges.
Solution: Color correction and cropping to avoid color difference.
Along the canvas The meridional direction shows strip-shaped or rain-shaped defects that are full-width, irregular in shape, and of different shades. Stripes are divided into gray cloth stripes and dyed stripes. The position of the head and tail of the billet remains unchanged, but the seam ends are the same, and the colors on both sides are similar. The dyed stripes pass through the seam, and the two sides have different shades.
Main reasons:
①Dye blank Dyeing stripes are caused by poor uniformity of fiber raw materials and fabric structures;
②Selected There are gaps in the hair flame causing burnt streaks;
③ When mercerizing the fabric, the alkali rolling and alkali removal are uneven, and the cloth surface absorbs color unevenly, causing dyeing streaks;
④ Air outlet Uneven wind force causes regular stripes
⑤ Post-drying is rapid and uneven, and dye migration causes streaks
Solution: Fix the color.
On dyed fabrics Along the weft direction, dark and light color blocks of varying width or neatness appear.
Main reasons:
①Weaving Poor operation during startup or poor beat-up device of the loom causes the weft density to be sparse or dense, and the color after dyeing is different from the color of the normal cloth;
②Dyeing processing Parking produces a color shift;
③ Curl dyeing And the dyeing residue rate of the rolled roll is too large, forming a more regular dark grade;
④If the semi-finished product is left for too long, the folding area will be contaminated and form a color gap;
⑤After mercerizing The fabric is not washed and dried in time, and the folds are air-dried, resulting in color gaps after dyeing.
Solution: Fix the color.
Small, dark spots appear regularly or irregularly on the printed and dyed cloth. The defects are either localized or scattered. . Generally occurs on light-colored fabrics.
Main reason:
① Make dye Poor dissolution when mixing with color paste;
②Material and If the color paste is left for too long, agglomeration will occur;
③The equipment is not clean properly.
Solution: Color correction.
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