Dyeing and color matching

With the rapid development of economy, the demand of modern textile market is becoming more and more personalized, and small batch, high precision, environmental protection and fashion have gradually become the mainstream demand, while traditional printing and dyeing technology is difficult to meet people's demand for textiles. At present, digital printing, a revolutionary new printing and dyeing technology, combines three major technologies of information technology: ① computer aided design (CAD) technology, ② digital manufacturing technology and ③ computer network technology, which changes the operation mode of traditional printing technology, brings brand-new ideas to textile printing and dyeing industry, and makes the printing industry enter the digital high-tech era from the traditional labor-intensive industry. The textile printing and dyeing technology revolution brought by digital printing technology truly reflects the market demand of personalization, small batch and quick response, and at the same time realizes the green manufacturing process with low energy consumption, no pollution and no noise. Honghua Digital Company is one of the few companies in the world that have mastered this high-tech technology. Committed to providing digital printing system with independent intellectual property rights for China textile industry, and becoming the pioneer of digital printing technology in China. Its digital printing system has been in the forefront of the world in technology. The characteristics of digital printing technology enable it to meet the application in some special fields, such as film and television stage, fashion show and other personalized products. With people's demand for clothing comfort, the production prospect of cotton knitted products is very broad. Based on our actual production experience, this paper introduces in detail the application of digital printing machine in cotton knitted fabric printing production and factory proofing.

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Reply: April 2005-19 9: 54:14

Content:

3. 1.4 Post-processing

(1) Steam treatment-

Box steamer can be used to steam things. Box steamer is a small and medium-sized steamer developed by our company to cooperate with digital inkjet printer with guide. It can steam 100 meter long fabric at one time, and it is easy to operate and has good coat color, which is very suitable for small batch production. When steaming, the fabric is hung on any cloth rack, the steam temperature in the box is about 102℃, and the exhaust port is connected with the outside atmosphere for continuous exhaust. Users with steam can access saturated steam with a pressure of 0. 1Mpa(kg/cm2), and users without steam can choose to connect a steam generator. Generally speaking, we suggest that the steam should be discharged to the outside, which can effectively prevent the indoor humidity from rising. In order to effectively use time and prevent more condensed water from being produced in the tank, the tank should be preheated. In order to obtain the saturated steam needed for steaming, a certain amount of tap water can be put at the bottom of the steamer, and the amount of water should just flood the steam inlet pipe at the bottom. After that, the sealing door of the steamer should be closed, and the steaming time and temperature should be set according to the type of fabric. General cotton cloth is 15 minutes.

(2) washing and drying

Cold water washing warm water washing soap washing (soap solution 2g/l) warm water washing cold water washing.

Dried

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Reply: 2005-4- 19 9:54:36

Content:

3.2 Key technologies of proofing

3.2. 1 color matching

It is a simple, intuitive and effective method to control the color of digital jet printing patterns of cotton knitting by using color cards.

Color cards commonly used in digital inkjet printing include RGB color cards, CMYK color cards, Lab color cards and PANTONE color cards. Compare the color of the customer's sample with the color card, find the color code that is the same as or close to the pattern color in the color card, record the corresponding value or number, input the color value in the graphics software, and adjust the color of the image.

3.2.2 Simulation of Large Sample Production Effect

Because computer printing is not limited by color, it can print millions of colors, and almost all natural colors can be reproduced on textiles. However, considering the technological limitations of actual production, we usually consider the latter process when making samples, especially when printing some high-precision moire watercolor patterns, we must first use computer color separation (CAD) technology. Simulate the registration number of traditional printing. Printing simulation can be carried out with the color separation software of Honghua Company (mainly considering the phenomenon of color overlap and dot gain). Really make samples for actual production.

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Reply: 2005-4- 19 9:52:27

Content:

Second, small batch processing and production

2. 1 development trend

With the continuous development of digital printing technology, small batch and multi-variety digital jet printing has become the development trend of printing and dyeing industry. In some developed regions and countries, such as Hong Kong, Japan and Europe. , 1000m below the high-grade fabric printing processing list has been basically digital jet printing production, and even customers have designated digital jet printing. Compared with traditional printing, digital jet printing has obvious advantages in time and price in small batch and multi-variety processing and production. Traditional printing has to go through the processes of color separation, drawing, production and screen making, which is directly related to pattern registration. For example, a simple pattern with 8 sets of colors requires 8 sets of films and 8 screens. At the same time, traditional printing also requires computer fees. Digital inkjet printing does not need plate making, and its production cost is only related to consumables. Therefore, the printing volume is below 300 meters, and digital inkjet printing has obvious cost advantages. Digital jet printing has gradually become a new printing and dyeing industry.

In addition, some domestic brands of clothing, such as Metersbonwe, Bang Wei, Bang Wei and Romantic Life, have entered this field, and many new clothing fabrics in spring and autumn are made by computer design and digital printing.

2.2 Powerful personalization and fast delivery

Digital printing machine can not only print grey cloth, but also print various pieces of clothing and ready-made clothes, which simplifies the process of clothing cutting. After entering the size of the garment cut in the computer, you can only print on the cut. Photographs, paintings and other works of art can be printed on the cut pieces of sweaters or ready-made clothes. The parts other than the cut pieces do not need to be printed, so on the one hand, the printing of useless parts can be reduced, the dyes can be saved, and the remaining parts without color are also beneficial to recycling; On the other hand, the process of re-cutting is omitted, and the purpose of cutting can be achieved by cutting according to the edge of the cut piece. Personalized processing can be completely realized in the design of clothing and fabrics, and the unique personalized needs of clothing can be truly realized.

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Reply: April 2005-19 9: 53:16

Content:

Third, the digital proofing technology of cotton knitted products

3. 1 proofing process

Mode preparation

Pattern design, post-printing treatment of customer samples (steaming

Fabric sizing

Chemistry, washing, fixation)

3. 1. 1 mode preparation

Design Draft: Designers can create and modify patterns, patterns and TINT at will through various design software.

Customer samples: Patterns can be input into the computer through various digital input means such as scanners and digital cameras, and edited by computer printing color separation system (CAD).

3. 1.2 Fabric Sizing

(1) purpose of resizing

The purpose of sizing is: ① to prevent the dye sprayed on the surface of cotton knitted fabric from penetrating and obtain a clear pattern. (2) Promote the combination of dye and fiber in wet and hot state, and obtain certain color depth and color fastness; (3) Sizing can effectively solve the curling problem of knitted fabric.

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Reply: 2005-4- 19 9:52:46

Content:

Computer printing is not limited by color, which can fully show the designer's design concept and aesthetic concept. Our designers design a batch of cotton knitwear, with 20 different patterns, including landscapes, fruits, buildings, the world famous paintings, and designers' creative patterns, which are basically positioning flowers. Using digital jet printing processing method, a cotton sweater cut with patterns on the front and back can be sprayed in 6 minutes at the earliest by randomly arranging the cut pieces according to the size and pattern position in computer software. Make two cotton sweaters for each of the 20 patterns, use * * * 30m cloth, and use a digital jet printer to add a guide belt, with an accuracy of 720*720. The four-way bidirectional printing mode takes only 3 hours, and the speed is 65438+1100m2/h. Traditional printing takes at least 5- 10 days. Finally, the designer selected two patterns and made 200 cotton sweaters according to the effect of the ready-made clothes. Compared with traditional printing, digital printing, as a design garment processing printing fabric, has absolute advantages. Traditional printing is very difficult in printing technology, cost and delivery time.

2.3 Precise lofting

In the production process, all kinds of data are automatically memorized by the computer. During mass production, the color data remains unchanged, which ensures the consistency of small samples and large samples and the next round. However, in traditional printing, it is difficult to ensure the consistency between small samples and large samples, because the color changes caused by different batches of sizing are the same. In addition, the printing accuracy of digital inkjet printing is high, and there is almost no problem of flower alignment and color registration accuracy. Will not produce a third color, rich colors, fine patterns, to a large extent, to avoid the possibility of products being copied.

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Reply: 2005-4- 19 9:55:06

Content:

3.3 Advantages of digital inkjet printing compared with traditional printing

Comparison between Digital Printing and Traditional Printing

Digital printing

Traditional printing

The production cycle is short, and it only takes about 3 hours from ordering to production.

The production cycle is long, and it takes at least 5- 10 days from ordering to production.

Design patterns at will, regardless of pattern type and number of colors.

Design patterns should consider the pattern type and the number of colors.

Direct printing pattern

Printed patterns need plate making, screen making and sizing before they can be printed on the computer.

Printing color can copy almost any color in nature.

The maximum printing color is 16.

Ensure that the small sample is consistent with the large sample.

It is difficult to ensure the consistency between small samples and large samples.

Suitable for multi-variety, small batch and personalized production.

Adapt to mass production

High printing accuracy (alignment accuracy, repetition accuracy)

Printing accuracy is average.

Good printing effect, consistent printing color and realistic pattern.

The performance of color saturation and gradation brightness is poor, and it is difficult to grasp some excessive moire patterns.

The data and process plan are easy to save, which ensures the reproducibility of printing.

The preservation of data and technical solutions is a headache.

Green production mode, no water, no color paste preparation, no waste dye solution of color paste, low noise.

The water consumption is large, and the waste liquid, waste water and waste slurry produced have caused great pollution to the environment.

Four. abstract

Digital printing technology can not only meet the needs of cotton knitting and garment manufacturing, but also be applied in a wider range, and any graphics designed can be printed on textiles very realistically. Although there are some shortcomings and limitations in digital printing at present, with the continuous progress of science and technology and the deepening of research and development by professional IT vendors, digital printing technology will be more perfect and widely used in a wider range of fields.

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Reply: 2005-4- 19 9:53:34

Content:

(2) Sizing formula

Slurry composition

Prescription 1

Prescription 2

Gram weight of fabric (g)

-

50~ 100

100~250

Above 250

Paste (g)

Printing and dyeing grade viscosity alginic acid (4%)

SD- 1 1(5%)

SD- 1 1(4%)

SD- 1 1(3%)

Baking soda (g)

4%

4%

4%

4%

Urea (g)

6%

6%

6%

6%

Water (gram)

x%

x%

x%

x%

Total (gram)

100%

100%

100%

100%

Effect evaluation

Better color depth and clarity can be obtained.

Good color depth and transparency can be obtained.

Note: SD- 1 1 is a newly developed high-precision slurry for jet printing with reactive dyes, which can solve the penetration problem in the process of jet printing.

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Reply: 2005-4- 19 9:53:54

Content:

(3) Sizing method

In order to ensure that the surface of cotton knitted fabric is free from weft skew and wrinkle printing, the flat scraping method is adopted as far as possible, and the sizing amount of the fabric is controlled by adjusting the pressure and angle of the scraper. When printing, the pattern should be sprayed on the sizing surface of the fabric, which can improve the fineness and vividness of the pattern.

3.

Cotton knitted fabric has elastic mechanism. In order to prevent wrinkling and weft skew in the printing process, cotton knitted fabrics are generally printed by digital printing machine with guide belt.

Guide belt digital printing machine is the third generation digital printing equipment introduced by Hangzhou Honghua Digital Technology Co., Ltd., and it is also the latest digital printing machine in the world at present. It absorbs the advantages of the traditional printing machine, and adopts the guide belt conveying mode, so that some knitted fabrics and clothing pieces that cannot be printed on the ordinary digital printing machine can be printed on the guide belt digital printing machine.