Note 丨 Active Air Dye Laboratory Sample Reproducibility Practice (dry goods)

The increasingly fierce competition in the printing and dyeing industry and the increasingly stringent customer requirements for color. Reducing production costs, high speeds, and high quality delivery have become the market guidelines for the printing and dyeing industry. In recent years, the cost of dyestuffs has doubled, the cost of pollutants has become higher and higher, the production cost of the entire industry has continued to increase, and the printing and dyeing industry is facing an unprecedentedly severe situation.

Fast and accurate large-scale production and improve laboratory sample dyeing reproducibility, can improve the success rate of dyeing, reduce production costs and improve the competitiveness of enterprises. The key to the current active dye cotton fabric sample to a laboratory to reproduce the staining produced large universal relatively poor, the problem is to control the fabric pretreatment and dyeing processes. Fabric pretreatment, the raw fabric contains a large amount of impurities, including impurities on the natural cotton fibers sake, only the less white color, feel rough, and poor water absorption, bleaching must be processed to remove most of the impurities, to follow-up Processing provides satisfactory semi-finished products. However, if the pre-treatment to varying degrees, will affect the reproducibility of dyeing, dyeing factories are now mostly used to take boiled cloth is adopted for improving this problem has been basically solved the pre-treatment differences. Workmanship staining due to large production staining reaction conditions strongly than testing chamber sample the dye on the dye uptake, fixation of the degree of hydrolysis is not the same, and post-processing boiled alkali cleaning inconsistent floating color degree, resulting in at the lab and large-scale production of color reproduction Poor sex.

Mathis company introduced Dyeing Machine simulate large-scale production can be set alkali curve, the amount of alkali and the addition time can be controlled throughout the dyeing process sample, so that large-scale production laboratories and gradually increase the color reproducibility.

In this test, the Sumifix dye combination was used to analyze the light, medium, and dark colors for analysis. The laboratory dyeing process was modified by experiments. Make the sample consistent with the degree of hydrolysis of large production, thereby increasing the primary production success rate.

1 test

1.1 material

Fabric: Cotton + spandex single cloth (cotton 23.6 tex, spandex 4.4 tex), width 160 cm, g quality l50g/m2.

Material: Sumifix Supra dye (Sumitomo Chemical Co., Ltd. of Japan), Summon powder, soda ash, protopine.

Equipment and Instruments : Mathis Data Fature NT Dyeing Sampler , THEN Air Dyeing Machine , Datacolor Color Matching Instrument .

1.2 Large production dyeing process

Sumifix dyes are double reactive groups with high direct and level dyeing properties of reactive dyes that have hexenesulfone groups and monochlorotriazine groups. The three primary colors have good compatibility, level dyeing and stability, and high fixation rate. Fastness is good.

1.2.1 Large production dyeing process

Sumifix dye combination dyeing

1.2.2 Process prescriptions and conditions

Light-colored prescriptions and conditions (khaki):

Sumifix 3RF Yellow 0.199%

Sumifix 3BF Red 0.0675 %

Sumifix BRF blue 0.0885%

Na2S04 15g/L

Na2C03 5.6g/L

Softener PA L.0 g/L

Penetrant JFC L.0 g/L

Bath ratio l:5

Holding time 20min

Color prescriptions and conditions (medium gray):

Sumifix 3RF Yellow 0.4%

Sumifix 3BF Red 0.33%

Sumifix BRF Blue 0.8%

Na2S04 40g/L

Na2C03 10.6g/L

Softener PA l.0 g/L

Penetrant JFC l.0 g/L

Bath ratio l : 5

Holding time 40min

Dark prescriptions and conditions (dark brown):

Sumifix 3RF Yellow 1.41%

Sumifix 3BF Red 0.814%

Sumifix BRF Blue 1.0%

Sumifix BF Blue 1.4 %

Na2S04 80g/L

Na2C03 20g/L

Softener PA L.0 g/L

Penetrant JFC lO g/L

Bath ratio l:5

Holding time 60min

1.3 Measurement

1.3.1 Uptake rate

The absorbance of the dye solution before and after staining was measured with a spectrophotometer, and the dye uptake was calculated by the following formula:

Dye uptake rate (%)=(1-nAl/mA0)×100%

Where : m/n is the dilution of the dye before/after dyeing ; A0/Al is the absorbance before/after dyeing diluted m/n times .

1.3.2 Reproducibility

Large-scale production of boiled and bleached fabrics is used for large-scale production of dyeing laboratory samples , and large-scale production samples are used as standard to read computer data △E≦0 . 5, and △H ≦0.3, reproducibility is OK, otherwise the reproducibility is not OK.

2 Results and discussion

2.1 Laboratory sample reproducibility results

In khaki, gray, dark brown mass production process for the same three colors review laboratory sample and repeat three times, and reproducible as shown in Table 1.

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