Causes and solutions to problems with yarn-dyed fabrics and printed and dyed fabrics

Weaving defects in the warp or weft direction appear regularly or irregularly on the fabric.

generated main Reason:

① The yarn is not strong enough.

② The yarn is poorly sized (light sizing or heavy sizing).

③ Defective weaving equipment (faulty weaving equipment will cause yarn breakage and other problems).

④ The repair of the unloaded gray fabric is incomplete.

⑤ The acceptance of finished products is not careful.

Solution: Strengthen repairs.

For woven Cloths and knitted fabrics with 2% weft skew/weft arc, and all fabrics with more than 3% skew cannot be classified as first-class products.

The main reason:

① Defective weaving equipment (faulty weaving equipment will cause more downtime, resulting in latitude/latitude arc)

② Mainly refers to the skew/arc caused by poor finishing equipment).

③ Poor finishing (tilt/arc caused by operator’s irresponsibility during finishing).

Solution: strengthen repair and rearrangement (correction).

If the shrinkage rate in the warp and weft directions of the fabric exceeds the specified value, it cannot be designated as first-class product. Different fabrics will have different ranges.

The main reason:

① Poor finishing

② Poor pre-shrinking device.

Solution: Pre-shrink again (Within the specified shrinkage rate)/Shrink and wash the fabric, etc.

The feel of the finished fabric is inconsistent with the feel of the standard sample, and there is an obvious difference.

The main reason:

① Poor finishing.

② The raw materials are incorrect.

③ The production process is incorrect.

Solution: Reorganize/reproduce.

The color fastness of fabrics (dyed fabrics and dyed fabrics) cannot be consistent with the requirements

The main reason:

① Poor dyeing process .

② The dyeing raw materials are defective.

③ Poor finishing.

④ Poor operation. (Especially obvious when paint scrapes/stains)

Solution: re-fix the color/re-produce the fabric/re-dye (dyed fabric is ok)/color correction (paint scraping/paint-dyed fabric is ok).

fabric There is a clear difference between the style and the standard sample (bamboo style/section dyeing style/thickness, etc.).

Main reason:

① The raw material is incorrect (Slub yarn is incorrect/yarn count is incorrect)

② The production process is incorrect (the process of segment dyeing is incorrect/the slub yarn or segment dyeing yarn Incorrect arrangement)

③ Incorrect finishing 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 Re-produce the fabric ② Re-finish the fabric.

2. Defects in printing and dyeing cloth Causes and solutions (dying problem)

The wrinkle strips are parallel to each other, flush from head to tail. The wrinkle strips are large in the middle and pointed at both ends. There is a yarn tail at the junction of the wrinkle strip and the flat surface, which is shaped like a skirt wrinkle. Skirt wrinkles mostly occur on fabrics containing chemical fibers and are not easy to find on original gray fabrics. It is only visible after printing and dyeing processing.

The main reason:

① Differences in the performance of the chemical fiber itself or inconsistent high-temperature twisting temperatures in textile factories result in different shrinkage of the weft yarn;

② There is a difference in the number or twist of the weft yarn used.

Solution: re-cast the original gray cloth production.

The wrinkle strips are connected to the seam head, one or more strips, different lengths. Some are in the seam One end of the head, some at both ends of the seam.

The main reason is: the seam head of the ground cloth operator is poor. The seam head is not straight, firm, the edges are neat, and the stitching is even.

Solution: Cut the seams together and make a second piece of fabric.

Generally presented on canvas There are not many strips, usually straight or diagonal strips, varying in length, width and width. Before printing and dyeing or after printing and dyeing processingThe color difference between the wrinkles produced during dyeing and the normal cloth surface is relatively large; the color difference between the wrinkles produced during the flat washing process after printing and dyeing is small.

Main reason:

① The original wrinkle strips of the semi-finished product before printing and dyeing;

② During the printing and dyeing process, the mechanical tension and roller pressure are not adjusted well; the guide roller , The parallelism of the drying cylinder is not well controlled;

③ Equipment cleaning is not done well.

Solution: Re-production.

After printing and dyeing, the middle and dark sides appear Shallow, straight or oblique thin wrinkles

The main reason:

①The mercerizing machine removes the alkali steam box and flat washing tank cloth guide roller that is uneven or stained with yarn ends and alkali scale;

②The tension of the mercerizing machine is improperly adjusted;

③ Opening the direct steam pipe of the alkali steamer will cause a large impact on the fabric and cause wrinkles.

Solution: Replacement

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 causes: 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 fabrics and dyes, resulting in light-colored stains on exposed parts. Reactive dyes are prone to wind marks.

Solution: supplement the birth.