Looking at the color from a distance, seeing flowers - introducing multi-color and multi-point printing methods
We are a big printing company in Shenzhen China . We offer all book publications, hardcover book printing, papercover book printing, hardcover notebook, sprial book printing, saddle stiching book printing, booklet printing,packaging box, calendars, all kinds of PVC, product brochures, notes, Children's book, stickers, all kinds of special paper color printing products, game cardand so on.
For more information please visit
http://www.joyful-printing.com. ENG only
http://www.joyful-printing.net
http://www.joyful-printing.org
email: info@joyful-printing.net
Any kind of technology has advantages and disadvantages. Each practical need has the most suitable technology. This is actually a dialectical relationship. In the textile printing process, this dialectical relationship also exists. If the pigment bismuth or dye) thickener, binder and various auxiliaries are not properly selected, the dye can not be dissolved sufficiently, and there is still insoluble matter; or printing paste After being placed for a long time, there will be some attraction between the dye ions or between the dye ions and the slurry molecules, causing the dye to re-aggregate to form a printed pattern to produce color points or uneven dyeing, which is originally undesirable in the printing process. Rickets are also a cause of print defects. This kind of defect is something that people don't want to see. In the printing process, we have to try our best to overcome it. Some people think that since the color point is a shortcoming in printing, whether it can be turned into a favorable aspect is suitable for its own technical needs. If the irregular color points are arranged in a novel style or pattern, then the printing will produce another visual effect, resulting in a novel printed product called multi-color multi-point printing. The multicolor micro dot printing method appeared. How to generate many color points? This can be achieved using microcapsule technology. Microcapsule technology is a technique in which a solid or liquid dye is coated with a film-forming material to form fine particles. The obtained microparticles are called microcapsules, and the dye contained inside the microcapsules is called a capsule core, and the outer coating membrane is called a wall material. The capsule encapsulates this wrapped dye, called a microcapsule dye, with which multicolor multi-point printing can be achieved.
Multi-color multi-point printing is generally the same in process and equipment as conventional printing, but it is different. One of the differences is the use of microcapsule dyes. In the printing paste, different color microcapsule dyes are encapsulated by the capsule. Cover, so they do not mix with each other into a color. Only after printing, the capsule is broken by fixing conditions such as steaming, dyes of various colors are released, and the fibers are separately colored, so that a variety of colors are uniquely formed. Micro dot pattern. The shape of the microdots is also different depending on the shape of the microcapsule dye, which may have a spherical shape, an elliptical shape, a droplet shape, a scale shape, a fiber shape or the like. If the ordinary yellow dye and blue dye are blended in the same color paste by a conventional printing process, it will become a green paste, which is still a monochrome printing. If the yellow and blue dyes are separately made into microcapsule dyes, they can also be in the same color paste. Due to the barrier wrapped by the capsule, the two dyes do not touch each other, that is, they do not mix. Only when the steam is steamed after printing, the dye is released from the capsule film to color the fibers separately, thus forming micro-dots of different colors. For visual reasons, the green pattern is far away, but the yellow color is seen from a near view. The micro points are formed. Therefore, it gives people a feeling of "looking at a near-color and looking at flowers". Some people say that multi-color multi-point printing is a printing method with a unique style different from the general "snow" effect.
The second difference: Because the capsule film of microcapsule dye is released type, it has certain firmness, so the mixing and temperature adjustment should be strictly controlled. It is best to first test the sample to find out the specific operation process conditions, especially the capsule. Conditions should be explored in advance to obtain a satisfactory print effect. Due to the different preparation methods of microcapsules, the properties of the capsules will be different, and the composition of the printing paste needs to be adjusted accordingly. For example, the MCP-HP microcapsule dye produced by Nippon Chemical Chemical Co., Ltd. can add urea to the printing paste to facilitate penetration. However, the microcapsule dye prepared by the spinning cutting method may not be added with urea; some may not be used to prepare a slurry or the like with water.
After multi-color multi-point printing and drying on one side of the fabric, you can also carry out the same multi-color multi-point printing on the reverse side to produce double-sided multi-color multi-point printing products. A multi-color multi-dot pattern consisting of printed micro-dots and printed micro-dots transmitted from the other side can be seen on each side, and the main tones of the two sides can be different. In addition, the double-sided multi-color multi-point printing effect can also be obtained by the padding method. A common dye can also be added to the mash or paste in the padding solution so that a ground color can be obtained. For example, if a polyester-cotton fabric is used, a separate reactive dye can be added, so that the surface of the fabric can form a multi-color multi-dot pattern with a whitening effect. The clothing and interior decoration products made of double-sided multi-color and multi-point printing products are very popular among customers.
The microcapsule dye particles are small, and the microcapsule dye can reach 100 to 10 million particles per kilogram. The microcapsule dye is composed of the inner core dye and the outer film. Due to the limitation of the manufacturing method, the core dye is limited to the current Water soluble reducing, dispersing, acidic and cationic dyes. The formation of microcapsules by water-soluble dyes is more difficult and complicated. The most suitable dye microcapsules are disperse dyes. Because they are insoluble in water, commercial dyes themselves contain dispersants, which are easier to disperse in water and coated with water-soluble wall materials such as methyl cellulose. Therefore, water-insoluble dyes The microcapsules can be formed by a phase separation single coacervation method, a complex coacervation method, and a physical method. The manufacturing method of the dye microcapsule can refer to the production of the microcapsule essence in the article "Scent Printing, Fragrance and Fragrance Four" in "Printing of Guangdong", No. 2, 2003, and will not be described here. However, it should be further explained that since the diffusing agent NNO in the gelatin and the disperse dye is easily condensed into a lump, in order to obtain the state of the microparticles, some synthetic colloid can be added as a protective colloid to prevent agglomeration. In order to obtain the strength of the microcapsule wall film, so that it can withstand the requirements of various printing methods, such as the pressure of the rubber roller, the copper blade scraper or the magnetic bar, the dye microcapsules should be hardened, and a certain amount of 39% formaldehyde, when cooled to 10 ° C, with sodium hydroxide to adjust the pH = 8 ~ 9 conditions, control temperature, reaction time and the amount of formaldehyde added to adjust the degree of hardening, if the hardening treatment is too much, the wall film is too hard, It may be that the microcapsules cannot be broken due to excessive hardness when the gas is steamed, and the dye is not released, and the fabric is difficult to dye. If you want to obtain smaller dye microcapsules, you can reduce the amount of synthetic gelatin, speed up the addition of acid and slow down the stirring speed. If you want to get larger particles, you can add some gelatin or diffusing agent NNO to form dye micro. After the capsule, the dispersion can be divided into two layers after being placed, and the supernatant liquid is filtered off, and the lower layer is the dye microcapsule particles.
Printing process: slurry preparation → printing → pre-baking → 140 ° C high pressure gas steaming → water washing → reduction cleaning → water washing → drying → finished product.
The composition (%) of disperse dye microcapsule printing paste is introduced as follows:
Microcapsule disperse dye 20～40
Sodium alginate pulp 50～85
Urea 5
Anti-staining salt S 2
Tartaric acid (adjusting pH)
water Moderate amount
Total amount 100
The application of microcapsule dyes in the fabric printing industry is still in its infancy, and in the long run, it is a promising dye printing method. For example, if the vat dye suspension is padded, the reducing agent cannot coexist with the dye, and the vat dye suspension must be padded first, then the reducing solution is padded after drying, and then the gas is distilled down. If the reducing agent is microencapsulated, it can be Dye co-solvent application. The phenolic base and the color base of the ice dye are divided into two times. The polyester/polyacrylonitrile and polyester/wool blends are dyed with two dyes. When the two dyes meet, precipitation occurs, which affects The use of a dissolution method, such as microencapsulation of one of the dyes, enables one application of dyeing, which simplifies the printing process. In addition, some dyeing auxiliaries with special properties can be coated and dyed at the same time as the dye.
It is expected that microcapsule dyes will continue to open up many new uses in the fabric printing and printing industry.