1. Causes and solutions of problems that may occur in the production of yarn-dyed fabric

1The weaving defect

There are regular or irregular warp or weft weaving defects on the fabric.

Main causes:

① the strength of the yarn is not enough.

② bad yarn sizing (light or heavy sizing).

(3) Poor weaving equipment (weaving equipment failure will cause yarn breakage and other problems).

④ the repair of the grey cloth is not complete.

(5) Careless acceptance of finished products.

Solution: strengthen the repair.

2Weft inclination/arc (including large and small grids)

For woven and knitted fabrics with a 2% weft skew/arc, and with a skew greater than 3% shall not be classed as first class.

Main causes:

① Poor weaving equipment (weaving equipment failure will cause many times of shutdown, resulting in weft inclination/weft arc)

② It mainly refers to the weft inclination/weft arc caused by the poor finishing equipment).

(3) Poor finishing (weft inclination/weft arc caused by the operator's irresponsibility during finishing).

Solution: Enhanced repair and rearrangement (calibrating).

3Shrinkage big

Fabric warp and weft shrinkage rate out of the specified value can not be defined as a class of products. Different fabrics will have different ranges.

Main causes:

(1) Poor finishing.

(2) the precontraction equipment is bad.

Solution: Pre-shrinkage again (within the specified shrinkage rate)/fabric shrinkage washing, etc.

4The feel is not consistent with the standard sample

The feel of finished fabric is inconsistent with that of standard sample, and there are obvious differences.

Main causes:

(1) Poor finishing.

② Incorrect raw materials.

③ The production process is not correct.

Solution: Reorganize/reproduce.

5Disqualified color fastness

The color fastness of fabrics (yarn-dyed and dyed fabrics) is not consistent with the requirements

Main causes:

① Poor dyeing process.

② Inadequate dyeing materials.

After finishing bad.

④ Bad operation. (especially when paint is scratched/dyed)

Solution: Recoloring/Re-production of fabric/Re-dyeing (dyeing cloth)/Repairing (paint scraping/paint dyeing fabric).

6The fabric style is not consistent with the standard sample

There is obvious difference between fabric style and standard sample (slubby style/section dyeing style/thickness, etc.).

Main causes:

① Incorrect raw material (incorrect slubby yarn/incorrect yarn count)

② The production process is not correct (the process of section dyeing is not correct/the arrangement of slubby yarn or section dyeing yarn is not correct)

The finishing process is not correct (when the raw material and organization are correct, the finishing process is correct or not will affect the style of the fabric)

Solution: ① Re-produce fabric ② Re-finish after finishing.

II. Causes of printing and dyeing defects and solutions (dyeing problems)

1The skirt wrinkled

The wrinkles are parallel to each other, and the head and tail are flush.

The middle of the wrinkle is large and the ends are pointed. At the junction of the wrinkle and the plane, there is a shuttle changing yarn tail, which is shaped like a skirt wrinkle.

Skirt wrinkle occurs in the fabric containing chemical fiber, the original grey cloth is not easy to find. Only after the printing and dyeing process is shown.

Main causes:

(1) the performance of chemical fiber itself or textile mill high temperature twist temperature is not consistent, resulting in different weft shrinkage;

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

Solution: re-cast good original grey cloth production.

2Sewing knit

Wrinkles are connected to the seam head, one or more of different lengths. Some at one end of the seam head, some at both ends of the seam head.

The main reason is that the sewing head into the cloth is not good. Failing to sew the head straight, firm, neat edge, uniform stitching.

Solution: together with the seam cutting, make secondary zero cloth treatment.

3Printing and dyeing processing wrinkles

Generally, the number of strips on the cloth is not much, usually straight or oblique strips, with different lengths and widths. Before printing and dyeing or printing and dyeing process produced wrinkle and normal, cloth color difference is large; After the printing and dyeing solid color in the process of flat washing, the wrinkle color difference is small.

Main reasons:

(1) the original wrinkle before printing and dyeing;

(2) in the process of printing and dyeing, mechanical tension, roll pressure adjustment is not good; The parallelism of the guide roller and the drying drum is not well mastered.

③ Preparing cleaning is not done well.

Solution: Replenish production.

4Silk knit

After printing and dyeing, there are thin dead wrinkles in the middle, shallow on both sides, straight or oblique

Main causes:

(1) the cloth guide roller of the mercerizing machine to the alkali steaming box and the plain washing tank is uneven or stained with yarn head and alkali dirt;

(2) improper tension adjustment of mercerizing machine;

The direct opening of the steam pipe in the alkali removal steaming box has a large impact on the fabric resulting in wrinkles.

Solution: make up production.

5The wind to print

Printing and dyeing fabric used to be exposed part of the normal color and cloth surface difference. Generally in the cloth folding or cloth on both sides of the irregular light color file or color strip.

Main causes:

Some of the printing and dyeing semi-products used for reactive dyes and disperse dyes, the cloth surface of the products with alkali, or by the effect of reducing gas in the air, affect the fixation of the fabric and dyes, and the exposed part produces light color. Reactive dyes tend to produce wind prints.

Solution: make up production.

6Side chromatic aberration, left center right chromatic aberration

Dyeing fabric edge or left center right color depth.

Main causes:

(1) the dyeing liquid roller or printing pressure is not consistent at both ends;

(2) when pre-baking or hot solution baking, the temperature and air volume of the middle and both sides of the cloth are not consistent, resulting in inconsistent dry and wet cloth left or right;

③ Under the same processing conditions, the transfer dyeing properties of patchwork dyes are not consistent, resulting in the change of color depth or color light.

Solution: Fix the color

7Shaded edge (edge color difference)

The edge color is darker or lighter than normal cloth color.

Main causes:

(1) roll dyeing cloth roll cloth edge is not even;

(2) when dyeing, the fabric curls the edge to cause a shallow edge;

(3) side tissue thick, with liquid amount caused by deep edge.

Solution: repair color, avoid color cutting.

8The flower

Along the warp direction of the cloth, there are stripe or rainlike defects with wide width, irregular shape and different depth. Stripe flower is divided into grey cloth stripe flower and dyed stripe flower. The head and tail position of the billet is unchanged, but the seam is similar in color on both sides. The dyed striped flowers pass through the seams, and there are differences in depth on both sides.

Main causes:

(1) the uniformity of the fabric structure and the raw material of the dyeing blank causes the dyeing stripe;

(2) the selected hair flame has a gap caused by singed strips of flowers;

(3) when the mercerization of alkali to alkali rolling is not uniform, cloth surface color absorption is not uniform resulting in dyeing strip flowers;

(4) wind irregularity caused by air tuyere has been a regular flower

After drying rapidly and uneven, the dye swimming caused a flower

Solution: Fix the color.

9Color shift

Dark and light colors of varying width or evenness along the weft of dyed fabrics.

Main causes:

(1) Poor operation of the weaving or the weaving machine beating-up device causes the weft density or thin or dense, and the color and lustre of the dyed cloth are different from those of the normal cloth surface;

(2) dyeing processing stop to produce color file;

(3) the roll dyeing and roll dyeing roll residual rate is too large, the formation of a more regular dark range;

(4) the semi-finished product is used for too long, and the folding place is stained with pollution to form a color file;

After mercerization, the fabric is not washed and dried in time, and the folding place is air-dried, and the color file is formed after dyeing.

Solution: Fix the color.

10Color dot

Small spots of darker color appear regularly or irregularly on printed and dyed cloth. The defect may be local or diffuse. It usually occurs on light-colored fabrics.

Main causes:

(1) when making dyestuff and colorant dissolves badly;

(2) the material and paste placed for too long to produce condensation;

(3) Poor equipment cleaning.

Solution: Fix the color.