Stir-frying snowflakes: firstly, mix volcanic rocks and potassium permanganate solution in an industrial washing machine to stir-fry, then put clothes in and stir-fry with stones, then wash the pulp with water and dry it.
Denim post-processing: washing, high-temperature setting, local pleating, hand rubbing, weaving and hand-knitting.
Enzymatic washing
Enzyme is a kind of cellulase, which can decompose fiber structure at a certain PH value and temperature, and make the surface of cloth
It can gently fade and shed hair (produce "peach skin velvet" effect) and obtain lasting soft effect. You can use both stones.
Or instead of stone, if used with stone, it is usually called enzyme stone washing.
The essential difference between horseshoe and sandblasting is that the former is chemical action and the latter is physical action.
The former uses a spray gun to spray potassium permanganate solution on clothes according to the design requirements, and a chemical reaction occurs to make the cloth fade. The fading degree is controlled by concentration and injection amount.
Sandblasting is also called sanding. Polishing cloth with special equipment (figuratively speaking, it is a large electric toothbrush, but it is a roller type). There is usually a charge.
Gas model matching.
In terms of effect, the former fades evenly, and both the surface and inner layers fade, which can achieve a strong fading effect. The latter only fades on the surface layer, which shows the physical damage of the fiber.
Local whitening is spray washing, dyeing clothes with a dyeing slurry. . The effect of washing out is natural. . Very beautiful! At present, many countries in Europe like to dye with this kind of washing water, and there is also a kind of washing water called vulcanization washing. . The principle is basically the same as this. . Only vulcanization can wash out gray.
Ordinary washing is to make clothes softer. If silicone oil is added, the knitted fabric will be lubricated a little more, so it feels smoother. Fingers will feel a little slippery after rubbing and poking. The simplest way to put it is to mix the fried stone or rubber ball with potassium permanganate solution and put it in the washing machine to "wash" or "fry" clothes. There are many effects, and the biggest feature is the remarkable fading effect. Because a large blasting stone was used at the beginning, the clothes fried out will have obvious "washing" phenomenon. Hence the name. Copying snowflakes ~ ~ is dry copying ~ ~ There is no water in the machine ~ Just use rubber balls, stones and chemicals ~ ~ After copying, you can copy snowflakes with water, and you can copy many colors ~ ~ You can register colors ~ ~ You can copy all colors in black.
Production practice of discharge printing of elastic denim
In this paper, the technological process and conditions of small-scale and large-scale discharge printing of elastic denim are introduced in detail, and the selection of key auxiliaries in discharge printing, such as adhesive, size and discharge agent, and the influence of pre-and post-dyeing treatment are emphatically analyzed, and the matters needing attention in production are pointed out.
Selection of auxiliaries for elastic fabric working cloth in descriptive discharge printing
1 preface
Stretch denim feels full, soft and thick, comfortable to wear, and clothes are easy to match with other clothes, so it has long been a popular fabric in the international clothing market. According to the customer's order requirements, we developed the discharge printing of stretch denim with unique patterns, novel styles, complete colors and diverse changes. The style is bold and rough.
2 production experiment
2. 1 variety
C 16X 16+70D 50-inch stretch denim
2.2 process flow
Pretreatment → scraping → steaming (102℃, 7min, 0. 1 MPa) → hot water washing → soaping → water washing → drying.
2.3 Optimization of process formula
White pulp drawing, g 1#2#3#4#
Discharge agent JN6080 100 120
Citric acid 30405060
Starch paste xxxx
Synthesis1g1g1g1kg.
Color map, g 1#2#3#4#
Discharge agent JN6080 100 120
Citric acid 30405060
Silk screen adhesive10010010010065438.
Starch paste xxxx
Coating YYYY
Synthesis1g1g1g1kg.
Different discharge agents contain different amounts of citric acid. The printing effects were compared through experiments, and the best formula was white discharge 3* and color discharge 3*.
2.4 Selection of adhesive
The choice of adhesive is very important. It has good reduction resistance and citric acid resistance to discharge agent JN, and must also have good printing performance and high fastness. It is best to choose low-temperature glue and steam it to achieve discharge fixation.
Dual-function, CS-9000 selected by our factory meets the above requirements.
2.5 Selection of slurry
The performance of slurry directly affects the quality and cost of printed products. Compared with corn starch paste, Pan-F selected by our factory has the characteristics of high purity, high coloring rate, good stability, acid resistance and convenient paste making operation, and has good compatibility with citric acid and discharge agent JN.
2.6 Selection of release agent
Through practical comparison, we chose dye transfer agent JN used in acidic medium and compared the carved white powder used in alkaline medium. White and painting have good effects and good chemical stability.
2.7 Choice of Citric Acid
In order to ensure that printing and steaming are completed under acidic conditions, the dosage ratio of discharge agent and citric acid is 2: 1.
3 cart production situation
3. 1 process
Pre-treatment of jig dyeing → printing → drying → steaming → jig dyeing heat → water washing → jig dyeing soaping → jig dyeing hot water washing → jig dyeing cold water washing → drying.
3.2 Pretreatment of Jigging
Indigo dyed denim is neither resistant to caustic soda nor to high temperature, humidity and heat, otherwise the color and elasticity of the fabric will be seriously lost. The most ideal process is amylase desizing process.
Hot water washing (50 ~ 60℃) → enzyme desizing (7658 amylase1.2kg150l salt 0.5kg/ 150l penetrant HP 20.3kg/ 150l, pH 5.6, temperature 50 ~ 60℃.
3.3 Print the prescription
White pulp diagram, g
Discharge agent JN 100
Citric acid 50
Starch paste x
Synthetic lkg
Color drawing, g
Discharge agent JN 100
Citric acid 50
Screen printing adhesive 100
Starch paste x
Coating y
Synthetic lkg
3.4 Post-treatment of jig dyeing
Post-treatment of jig dyeing can clean printing paste, medicine and discharge background color, and soda ash must be added in hot water washing to make discharge agent JN remove the yellow substance formed by indigo decomposition, and then fully soaping and hot water washing can achieve better results.
Hot water washing (50 ~ 60℃) → alkali washing (2g/L soda ash, twice above 80℃) → hot water washing (twice above 80℃) → soap boiling (90 ~ 95℃, 2g/L soda ash, 4g/L detergent) → hot water washing (twice above 80℃) → cold water washing →
3.5 Testing color fastness
After discharge printing, the color fastness of elastic denim is 2 ~ 3, dry friction 2, soaping 4, soaping 4 and brushing 3.
3.6 Preventive measures
3.6. 1 Discharger JN and citric acid must be separated. Dissolve discharge agent JN in hot water at about 80℃, then add it into the slurry and mix it evenly; In addition, citric acid is dissolved in cold water and then added to the slurry; Finally, paint and adhesive are added.
3.6.2 After steaming and washing, a certain amount of soda ash must be added to make the yellow substance fall off quickly, otherwise the yellow substance formed on the cloth surface will not be cleaned, and the white area will fade, which will affect the cloth surface effect.
3.6.3 Printed fabrics can't find problems intuitively, so they should be steamed by printing to find defects in time.
3.6.4 color paste modulation should have a certain thickness, otherwise it will make.
The edge is not clear, which affects the fabric effect. The color paste is too thick, which is not conducive to penetration and is easy to cause blue spots on the screen; If the color paste is too thin, it is easy to flow to form white spots, and the outline of the pattern is not clear, resulting in burr effect and unclean painting.
3.6.5 Because it is difficult to print light-colored patterns on deep background, 30% masking white paste can be added to the printing color paste.