Fine: a comprehensive gray fabric printing and dyeing process

1, blank inspection and sewing of gray cloth:

A. That is to sew the gray fabrics one by one into a large roll or a box, called a cylinder. The number of a cylinder varies depending on the type of fabric processed. different.

B. The main purpose of gray fabric inspection is to control the quality of gray fabrics to see if there are any abnormalities such as drawing, weft stalls, dead folds, yellow spots, mildew spots, etc. At the same time, attention should be paid to checking Whether the fabric type is consistent with the requirements. Under normal circumstances, a batch number is required for inspection.

2, Desizing:

A. In order to make the yarn lint-free during weaving, the yarn is sized, so it must be desized before dyeing to facilitate coloring.

BIf the desizing is not clean, defects such as color flowers and pulp spots will appear on the cloth after dyeing.

C. After desizing, it is generally necessary to wash it with water, otherwise the fabric will have a high PH value and may cause dyeing defects and other abnormalities.

D. There are generally two desizing methods: in-cylinder desizing and long car desizing. Generally, the former has better desizing effect but low efficiency.

3, dyeing:

(1) Chemical fiber dyeing method:

A. Normal temperature jig dyeing: the general temperature is below 100℃, mainly used for dyeing semi-gloss nylon taffeta, nylon Oxford, nylon twill, etc. This method is prone to abnormalities such as head-to-tail chromatic aberration, left-middle-right chromatic aberration, and creases.

B. High-temperature jig dyeing: the temperature is generally around 130°C. It is mainly used to dye polyester taffeta, N66, nylon matt cloth, polyester Oxford (long Silk), etc. This method is prone to abnormalities such as head and tail color difference, left, center and right color difference, creases, color spots, etc.

C, overflow dyeing: the temperature is about 100℃ to 130℃, mainly used to dye polyester such as pongee, peach skin, polyester Oxford , Taslon, nylon-polyester interweaving type, etc., polyester yarn can also be dyed by overflow dyeing, while nylon yarn and other yarns with dyeing and wrinkle requirements can also use this method. This method is easy to produce abnormalities such as color flowers, chicken claw marks, and straight strips of dyeing and folding. D. Beam dyeing: suitable for all types of fabrics, but it must be used reasonably according to quality requirements. The dyeing temperature can be controlled above 100°C to 130°C. This method is prone to abnormalities such as shallow edges and layer differences.

(2) Dyeing methods of other cloth types:

A. Cotton dyeing: generally long lathe dyeing (requires large batches), pad dyeing (can be large or small batches), overflow dyeing (medium and small batches). Reactive dyes (good fastness), direct dyes (poor fastness), and vat dyes (good fastness) can be used.

B, N/C, C/N dyeing: Generally, overflow dyeing is used to dye cotton first and then nylon. Reactive dyes are used to dye cotton and nylon. Use acid dyes (faster). Direct dyes are also used for one-time dyeing (poor fastness).

C, T/C, C/T dyeing: Overflow dyeing is generally used, polyester is dyed first and then cotton. Disperse dyes are used for polyester and cotton. Reactive dyes (good fastness). There are also long lathe dyeing methods, which are dyed in one go, and direct dyes (poor fastness) are used.

(3) Dye classification:

A. Acid dyes: used for dyeing nylon fabrics. Generally, the color needs to be fixed to improve the color fastness. Attention should also be paid to the selection and reasonable use of dye combinations. dyeing process. Improper selection of color fixing agent or too high dosage will result in hard hand feel.

B. Disperse dyes: used to dye polyester fabrics. Reduction washing is generally used to improve color fastness. At the same time, attention should be paid to the selection of dye combinations. and use reasonable dyeing techniques. Disperse dyes pay special attention to dye migration problems and sublimation fastness problems.

C, reactive dyes and direct dyes: are low-temperature dyes.

4, drying:

(generally divided into two types: drum drying and non-contact drying)

A. There are two types of non-contact drying: non-contact dryers and setting machines. There is no contact between the fabric and the heater, and the hot air is sprayed onto the The fabric is brought up for drying purposes. Mainly used for drying overflow dyed products to…Glue, urea glue, etc. Corresponding raw materials can also be added to the glue to make it anti-ultraviolet, flame retardant, and anti-yellowing.

E When applying glue, attention should be paid to controlling the water pressure, feel (thickness, softness and hardness), uniformity of glue application, peel strength of glue, and resistance to water washing (general White) condition, whiteness, etc. Also pay attention to the rubber particles, glue marks, and whether it is dry on the rubber surface. Pay attention to the effect of applying waterstop strips (PVC strips/PU strips) on the rubber surface.

8. Laminating PVC: Pay attention to the thickness and feel of the lamination, the peel strength of the lamination, the quality of the adhesive surface, etc.

9, other processing: dry PU (release paper), composite, PU leather, etc.

10. Washing: Some cotton, N/C, and T/C also need to go through the washing process. There are three types of washing: ordinary washing, soft washing, and enzyme washing (to remove floating hair on the surface of cotton cloth).

11. Inspection: Inspect the quality of finished products, classify them into grades, and package and organize them for shipment. Generally, inspection records and difference sheets must be posted. If you have any questions, please report them to the salesperson promptly so that you can communicate with customers in a timely manner.

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