Textile people should have encountered defects in the appearance of dyed fabric products, but how much do you know about the reasons? Let's find out together!

The color and luster of dyed products are different, and the shade is different.
(1) Color difference in the same batch: in the same batch of products. There are color differences between boxes of a color number, between pieces, between packages, and between pieces.

(2) The same color difference: there is a color difference on the left side or a color difference between the front and back or a color difference on the front and back sides of the same product. Chromatic aberration is one of the common defects and multiple defects in dyeing and finishing factories, which seriously affects the quality of dyed products.

cause 

(1) Improper formulation of dyeing prescription and process. Before the dyed products are put into production, they must be sampled by color matching. But in fact, the sample and the actual conditions of dyeing production are not the same, and the dyed color is generally different. Therefore, this requires dyeing workers to understand and master the gap and relationship between the color matching sample and the actual dyeing production, correctly use the information and data obtained from the color matching sample, analyze and process them, and formulate more realistic and reasonable. Dyeing recipes and processes. If it is not properly mastered and adjusted many times in the dyeing production, the color of the dyed cloth produced by it must not match the standard sample.

(2) The color discrimination light source is not uniform. At present, most of the light sources for color discrimination in printing and dyeing factories use natural light (north sunlight) and ordinary fluorescent lamps. The disadvantages of the above light sources in color discrimination are:

a) Natural light is susceptible to variations in weather;

b) There is a big difference between ordinary fluorescent lamps and natural light, and the color is generally reddish. Therefore, the color effects of the same dyed cloth under different light sources are different. The dyeing standard sample and the dyed cloth are often different due to the difference in the dyed fiber raw materials, the structure of the grey cloth, and the dyeing and chemical materials used. As a result, the color of the two is basically similar under a certain light source, but the color is viewed under another light source. , the gap between the two is larger.

For example, the light jade color and light orange color dyed at night are often reddish when viewed during the day, causing the color and luster to not match the standard sample, resulting in some color positions "overwhelmed" and had to be re-dyed; another example is polyester-cotton blended fabrics. The fabric is dyed in two colors (cotton and polyester fibers have different hues), and as a result, the shades of some colors obtained under ordinary fluorescent lamps and natural light during the day are completely different, and the dyed fabrics do not conform to the standard sample.

(3) The dyeing production plan is poorly arranged. The dyeing production plan is not arranged in the order from light to dark, and there is no transition color arrangement when changing colors with large hue differences. .

(4) Poor batch management of dyes and auxiliaries. Dyeing production has relatively high requirements on the shade of the dyes used. The mixing of any dye with different shades will cause the color of the dyed cloth to be inconsistent with the standard sample.

When dye factories are manufacturing dyes, due to the differences in the raw materials used, the textures, the synthetic process routes, and the influence of different process conditions, the dyes of the same product name produced by different places of origin and different factories have different shades. Differences.

Even if the dyes of the same origin, the same factory, and different production batches of the same product name, there will be differences in shade. If the dyeing factory mixes the materials and uses them regardless of the place of origin or batch, the dyed color will definitely not match the standard sample. Adjuvants have a similar situation.

(5) The dyeing process conditions and operations are not well mastered. The color does not match the standard sample due to this reason is roughly as follows:

a) Semi-finished products before dyeing do not meet the requirements. If the dyed semi-finished products are not mercerized enough, the mercerization will be alkaline to change the color. For example, after dyeing with sulfur element, the surface of the cloth is reddish and not black.

b) Hard water is used for dyeing. Dyes sensitive to hard water can easily cause dyeing defects. For example, direct pink 12B, direct lightfast blue RGL, etc. will become lighter in color when exposed to hard water, which does not match the color standard.

c) Improper management during dyeing will affect the dyeing effect. For example, in the dyeing of insoluble azo dyes, the fabric after the semi-finished product does not develop color immediately, and if it is left for too long, the color phenol on the base fabric is decomposed by the influence of the air, and the color becomes lighter.

d) The dyeing material was weighed incorrectly, the dosage was inaccurate, and it was not detected in time during the dyeing process, and the dyed color did not match the standard sample.

e) The technological conditions must be strictly controlled during the dyeing process. If the process conditions are not well controlled, such as unstable temperature, humidity, concentration, pressure pH value, vehicle speed and drying conditions, the color of the product will be affected.

Need more good quality fabrics go to coopertailor here.