Reactive dye discharge printing for cotton fabrics

Abstract: This paper introduces the experience of using the CDR reactive dye to dye the ground and P-type reactive dyes to discharge printing.

Keywords: cotton fabric; reactive dye; discharge printing

The direct printing in the traditional process is easy to produce the complex color printing between the hue, and the anti-staining printing of sodium sulfite often fails to meet the requirement of clear and fine outline of the flower pattern. Our company has implemented anti-discharge printing production practices to meet customer requirements. Through our efforts, our company has now developed a mature production process that uses both the CDR-based dyeing base of reactive dyes and the reactive dye P-type of Shanghai Dongmei Company. Discharge printing, its operation is simple and the Shihlin dye rich hue, the product is uniform color full, fine pattern, clear outline, no complex color printing, can achieve satisfactory printing effect.

1 Fabric specifications and process flow

15x15 523x283 Cotton Mercerized Poplin Dyeing Drying and Styling Printing Steaming (102°Cx8min) Baking (160°Cx3min) Washing Soap Washing Drying Lap Test

2 Stained color

Dye on an Overflow Dyeing Machine and select the Marcozol CDR dye that is suitable for discharge.
Process prescription:
Marcozol CDR Dye 3-6% (owf)
Soda 20--30g/l
Salt 60--80g/l
Bath ratio 1:20
Temperature 60°C
60min

Process flow:
The dyeing gradually warmed to 60 °C (heating 30 - 60min) cold water soaping (90 °C, 10min) washing with water Drying Specific practices: room temperature into the water, into the cloth after 5min add dye 10min add salt, warming to 60 °C (heating Rate 1 °C / min), continue dyeing 10min, adding alkali heat 30--60min, cooling after processing, in rotary screen printing machine or flat screen printing machine.

3 printing

On a rotary or flat screen printing machine.
Original paste preparation:
Water 50g
Urea 30g
DK-TN 20g
Synthetic 100g
Discharge printing prescription:
Pull white pull
Marcozol P Dyes --- X
Original paste 60 60
D-TN 4.5--7 0--4.5
Adequate amount of water

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Synthetic 100g 100g

DK-TN is a new type of paste developed for the discharge printing of reactive dyes. This product has the characteristics of resistance to discharge, and it can be used alone for a general medium density dyeing cloth and has a good effect on black and navy. The discharge of extremely thick dyed cloth can be combined with the DK--TN discharge agent. D-TN is a new type of discharge agent developed for the dyeing and dyeing of reactive dyes. This product is combined with DK--TN paste. Material compatibility is good, no halo occurs when used, but also produce the best results.

4 Drying

The drying and drying of fabrics after discharge printing is a very important condition for the clear and even pattern of printed fabrics. Drying is as fast as possible. The drying temperature is generally 130°C and the time is 2 to 3 minutes.

5 Steaming

Using German Babcock long loop steamer steamed at 102°C saturated steam for 8 minutes, saturated steam at 102°C must be used to allow the fabric to absorb moisture to the maximum so that the dyestuffs dissolve and a better amount of color is obtained.

6 Baking

The process conditions are 160°C, 3min

7 post-processing

Cold water washing hot soaping (95 °C, 3min) hot water washing cold water drying

8 Precautions

8.1 Excessive amounts of DK-TN have a detrimental effect on color appearance and placement stability.
8.2 Due to the problem of discoloration of the dye, the discharge slurry should not be stored for more than 48 hours.
8.3 Drying should be sufficient after discharge printing and immediately steamed as soon as possible.
8.4 When soaping is as hot as possible and soaping is complete.
8.5 D-TN discharge agent can not be combined with sodium, aluminum ion dyes and additives, otherwise the discharge effect is not good.

Authors/Xue Suzhen, Wu Lifang, Liu Xuezeng, Guo Weimin (Yi Printing & Dyeing Co., Ltd.