Appearance: The surface of the dyed fabric has a dark flake, a variety of shapes, and irregular spots.

Causes: 1. Improper use of dyes and auxiliaries. Dissolution and dispersion of the dye are not sufficient. 2). Dyestuffs or auxiliaries contain impurities. 3). Dyeing water hardness is too high, not using soft water, or using soft water softener.

(16) Dyeing streaks

Appearance: The yarns or yarns arranged adjacent to the dyed fabric show differences in hue, density, and brilliance. There are only one person, and there are also several yarns that are banded. There are shorter ones and all the others.

Causes: This is a chemical problem with chemical fibers used in dyeing fabrics. This difference occurs due to the difference in dyeing properties.

(17) Glossy streaks

Appearance: The surface of the non-fluff dyed fabric, when exposed to light, the color will appear as a strip of light or dark.

Cause: This is the physical property of the chemical fiber used in the dyed fabric. Due to the different reflectivity, absorbability, and permeability of the fiber in the fabric, the gloss, transparency, and whiteness are different in observation. For example, the additives in the chemical fiber, the degree of crystallinity, the degree of orientation, and the amorphous state all affect the gloss of the fiber itself.

(18) Staining weave spots

Appearance: dyed fabrics with non-plain weaves, depending on the change of the tissue, the color of the fabric is dark, light or bright and dark.

Causes: Due to the structure of the fabric, the distribution of the interweaving points of the fabric and the arrangement relationship between the warp and the weft are different, resulting in different reflectivity and permeation of the fabric.

(19) Spacer strips

Appearance: In the warp direction or longitudinal direction of the dyed fabric, the difference in the color of the straight strip is formed. Causes: During the dyeing process, the warp yarns of the fabrics are moved to make the arrangement density of the yarns non-uniform, and the gaps between the adjacent yarns are large and small, resulting in differences, resulting in visually shallow and deep.

(20) Spot dye spot

Appearance: Polyester fabric dyed cloth, with droplets of concentrated dyeing spots.

Causes: 1) When the polyester fiber fabric is dyed in an atmospheric pressure bath, spots are formed on the surface of the fabric after absorbing the dye due to poor dispersion of the dye-conducting agent. 2). The dye-conducting agent that volatilizes during atmospheric dyeing, condenses on the top of the device and drops on the dyed material.

(21) Warp stripe

Appearance: pieces of dyed woven fabrics, with rain-like stripes in the direction of the fabric warp. In severe cases, it can be seen on the cloth surface of the grey cloth. This type of defect will show significant and inconspicuous differences due to the darkness of the test site, the direction of observation, and the distance.

Causes: 1). It is formed due to the difference in yarn count, uniformity, number of twists, and the cross-sectional shape of the yarn. 2). Improper use of dyes, especially when dyed green. 3). If the polyester processing silk fabric, improper desizing before dyeing, local residual paste, stain less when dyeing, lighter in color, and the existing warp stripes.

(22) Dye stripes

Appearance: In the weft direction of the woven fabric, or the horizontal continuous loop of the circular knitted fabric, the color after the dyeing shows a deeper or lighter ribbon.

Causes: 1). The woven fabric has a secret path or a sparse pattern. 2) When the knitted fabric is weaving, the yarn feeding tension is uneven, or the number of loops is uneven. 3). Filament yarns with the same specification and different lot numbers are used for weaving. 4). The filaments used for knitting are not uniformly heated during the heating process.

(23) Dye spots

Appearance: 1). In the dyeing, light-colored fabric cloth, with the same color of the tiny color points. 2). On the cloth surface of bleached or light-colored fabrics, there are tiny spots of other dyes.

Causes: 1) The dye is poorly dissolved, and there are tiny particles that are not dissolved. 2). The dyestuffs fly in flight and fall on the fabric to be processed. 3). The mechanical equipment is not cleaned. After the dark color is processed, light color processing is continued.

(24) Rope marks

Appearance: When the rope is dyed, the fabric shrinks into a rope. After dyeing, the cloth surface has irregular dark and light wrinkles along the direction of the cloth length.

Causes: When using Wenqi or liquid dyeing machine dyeing, the fabric is not pre-determined or stereotyped. In the dyeing, the scroll bar malfunctions and stops running. Rapid warming or cooling. The dye bath ratio is too small, and the fabric knots in the cylinder.

(25) Pressed creases

Appearance: When the woven fabric is dyed by the open-width dyeing, the fabric is folded in the warp direction between the two rolls. When passing through the pressure line, the suction rate varies due to the difference in thickness. The folded part is slightly lighter than normal. Occurs in the two fabric parts of a fabric.

Causes: 1) The fabrics to be dyed have creases during the pre-treatment process and are not completely eliminated during stereotypes. 2) The spreader of the cloth feeding device failed to fail to open the fabric. 3). Horses and horses have bad joints, and there is shrinkage or irregularities.

(26) Wood grain

Appearance: The surface of the dyed fabric shows a grainy, shiny appearance.

Causes: 1) When the warp beam dyes, the shrinkage of the fabric is too large and the curling layer moves. 2) When the warp beam dyes, the coil is placed too tightly, causing the dyeing fluid to circulate abnormally.

(27) Bad dyeing

Appearance: After dyeing the fabric, the edge of the fabric is different from the color of the fabric.

Causes: 1) The fabric edge of the fabric is too loose or too tight. 2) When setting before dyeing, the cloth edge is clamped by the high temperature splint. 3). Edge curling occurs when dyeing. 4) When the open-width dyeing is performed, the winding is uneven and the cloth edge is oxidized. 5). Insufficient reduction during open-curing vulcanization or vat dyeing. 6). The pressure suction rate of cloth edge and cloth surface is inconsistent when open-width dyeing. 7). After washing, the stain is insufficient and there is residual drug on the cloth.

(28) Discoloration of the cloth

Appearance: Finished fabric after dyeing and finishing. The color of the cloth is different from the normal one.

Causes: 1). When the resin is processed, the temperature of the needle plate or splint is too high, and the dye sublimates. 2) When drying the fabric using a rotary drum dryer, the temperature is too high and the cloth edges are tight on the cloth cylinder.

(29) cloth marks

Appearance: refers to the cylindrical knitted fabric, tubular flat folded on both sides of the turn, showing abnormal dyeing phenomenon.

Causes: 1). The oil added during weaving deteriorates. 2). The fabric is stored improperly or for too long, and the cloth edges are changed or contaminated by air and sunlight. 3). When the cylinder is shaped, the temperature of the setting frame is too high.

(30) hot mark

Appearance: The cloth surface of the dyed fabric has large creases that are lighter in color, the area is not the same, and the direction is not certain. It mostly occurs in the E/C blended woven fabric.

Cause: Due to the use of conveyor belt type continuous training floater, the machine is filled with saturated steam, and the stainless steel conveyor belt is subjected to high temperature drying and close to the fabric on which the fabric is folded so that the fabric is reduced in color absorption due to low exposure.

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