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Detailed explanation of how to print ink
Time: 2013-05-07 Source: Cutting Edge of Packaging Read: 13378 times
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Wenzhou Junchuan Machinery Equipment Co., Ltd.

With the introduction of global environmental legislation and VOC emission control regulations, the era of ink printing has come to an end. Some people develop, some question, some agree, some wonder, some welcome, and some applications are the process that any new product application begins to experience.
In the recent period of time, in addition to the work of experimentation and comparison, the author has made in-depth exchanges with colleagues around the country on how to better use ink and wash. At present, inks made from domestic materials can be printed without printing on non-absorbent and non-polar materials. It can be said that it is rare in the history of human civilization ink and is a great breakthrough.
The specific cases are described below. The ink problems in these cases are all representative. The solutions will be shared, exchanged, communicated and discussed with you. If your friends have better solutions, please also criticize them. correct.
1. General Manager of Weihang, Yiwu City, Zhejiang Province: Liu Gong, can you provide water-washable screen printing ink formula? It is required that after the silkscreen graphic embroidery is completed, the dry ink of the silkscreen can be dissolved with water.
A: The key to formula design of water-washable screen printing ink is whether the binder resin can be redissolved in water after curing. Whether it is polymer electrolyte or low-molecular electrolyte, the focus is here. The second is that the number of colorless steel (HLB for short) is best to choose between 11-20. Types of binder resins (electrolytes) such as thermoset and light-set, and colorants with HLB values from 0 to 9 cannot be dissolved twice after drying.
For this reason, it is recommended that the formula design and production of water rewashed screen printing inks be carried out with cellulose containing carboxyl or hydroxyl groups or modified thermoplastic binders + hydrophilic (HLB: 11-20) colorants or inorganic colorants, etc. . However, the colors of the insoluble silk embroidery must be screened after testing and comparison, and the quality parameters adapted to the user's requirements can be used for formal production and marketing.
2. General Manager Sheng of Xiamen City, Fujian Province: Mr. Liu, where is the ink matting powder? In addition, except for the yellow ink, what remedy is used for the ink difference on the red and blue ink?
Answer: The method and principle of matting with ink and solvent ink are almost the same, only the difference between hydrophilic and lipophilic. Such as commercially available water-based wax or inorganic white carbon can be used. A chemical extinction method can also be used-the imbalanced solvent evaporation of the ink system can also achieve its extinction purpose. Regarding water-based red and blue additives, they are: L-6000 and L-2200.
3. Mr. Tianlong Ouyang, Gaoyao City, Guangdong Province: Liu Gong, can you provide the main material composition of plastic ink for flexible packaging printing?
Answer: As far as I know, your company is one of the top ten ink manufacturers in the country, and it has been produced in the past. If Mr. Ouyang is interested in this product, he can also re-examine the original product and test its indicators to find out the differences between the original product and the current product on the market. Then adjust according to the specific situation.
As a colleague, we suggest that you choose W-5 synthetic resin, TU370, CTPU600W, L-6000, L-2200, TM-200S, polyols, medium-weight agents, water-based waxes, deionized water agents, and lightfast or permanent pigment designs. Formulation, production test, test printing test, one by one under the conditions of high temperature, high humidity, low temperature freezing environment, to observe the characteristics of the ink and the physical changes of the printing ink film. You are right that these useful work may promote the product to a new level.
4. General Manager Zhou of Shanghai: Liu Gong, there are still some problems in ink wash in terms of crusting, transfer and tinting strength. What do you think of the future of ink wash?
A: I talked with you nine years ago. At that time, ink was mainly used in rough paper packaging. My interest in this product was in Huangshi Huaxin Cement Group, Laohekou Gem Group, and Hangzhou City in Zhejiang Province. Dibang Fine Chemical Factory, New Oriental Ink Group, Wenzhou Longgang Printing Industrial Park, Dongguan Yingke and Shenzhen Gu Kangli and other companies have gradually cultivated. With many supporters in the ink, packaging and printing industry, our inks have made fruitful attempts in PE, PP, PET, PVC, aluminized film, aluminum foil and other non-absorbent, non-polar materials.
The crust of ink shows the agglomeration during the formation of the printing ink film-that is, the initial drying and thorough drying can be achieved in a short time after printing. This is exactly what the ink and wash maker wanted. As long as we scientifically add a polymerization inhibitor or an antioxidant dispersant, we can overcome it. As for the poor transferability, it is said that the ink system resin and pigment have poor wetting and dispersion, and the solvent of the linking medium is improperly mixed to make it lose its volatility gradient. As a result, people have taken many detours in these years, and even repeatedly make the same mistake. There are not a few people, and the coloring force has a clear causal relationship with these. A visionary scientific practitioner can correct only if he has doubts about the bad results of everything and finds the crux of the doubt. What is a scientifically designed ink formula? My understanding is: Is the hydrogen bond value of the binder and the substrate the same or similar or similar? The solubility (ink and water solubility are also related to film formation) and surface tension can be compensated by increasing the drying function or corona treatment of the substrate. This point should learn from Shenzhen Gu Kangli Huang Chu, the boss who did not lightly abandon new products. He always adheres to the concept of "application in research and development, perfection in application, improvement in improvement, innovation in improvement". Across the shore.
5. Mr. Gu Kangli, Shenzhen City, Guangdong Province: Mr. Liu, how to solve the problem of low gloss of ink after printing?
Answer: The most perfect ink is the one that can meet the requirements of low-speed and high-speed printing. In the past, people generally know that the gloss of printing inks and traditional printing solvent inks is incomparable. For this reason, I have repeatedly tested different good inks from domestic and foreign brands, compared the gloss after printing, and re-tested the test. My experience is manifold. For example, add 1% ~ 2% EJ additive in water-based rosin or water-based acrylic ink, or 0.5% ~ 2.0% L-6000 additive in water-based polyester or polyurethane- based ink. The above problems can be solved.
In addition, an appropriate amount of polyhydric alcohol or alcohol-ether leveling additives can be used to improve the gloss of the printed ink film due to uneven ink film. Secondly, the roughness of the printing plate or pressure roller surface also affects the gloss of the ink film.
6. Mr. Xu from Chengdu City, Sichuan Province: Mr. Liu, what caused the poor adhesion of the screen printing ink on the shoes?
A: This question is simple to say, but difficult to do. I have reminded again and again: "Same sex can only meet, different sex cannot be analogized." That is to say, when choosing to produce screen printing ink for shoes, you should first screen from the main resin of the ink-the same or similar , Or similar; followed by the surface tension and specific surface area of pigments with high tinting strength, or easily dispersible solvent media, the hydrogen bond value is very critical. Otherwise, it cannot be used well.
7. Ms. Hu from Shijiazhuang: Teacher Liu, what solvent can be used to slow down the film-forming time of packaging printing inks?
Answer: Since you have not provided specific types of packaging printing inks, you have not introduced the composition of your ink formula. I can only adjust the drying (film-forming) property of the ink printing graphic ink film with respect to the solvent: if the surface printing ink is mainly produced with polyamide resin, n-butanol or cyclohexanone should be added; if using Inner printing inks produced with chlorinated polypropylene resin as the main body should be added with xylene or cyclohexanone; if retort-resistant printing inks produced with polyurethane as the main body are used, alcohol-ether solvents should be added; Offset printing inks produced with dry vegetable oil as the main body should be added with vegetable oil or mineral oil with a temperature range of 300 ° C to 360 ° C. If UV inks produced with unsaturated resins as the binder are used, hydroquinone polymerization inhibition can be added. Or reduce the amount of photoinitiator.
8. Mr. Feng Antai from Foshan City, Guangdong Province: Mr. Liu, after the water-based printing ink is used, what can be used to clean the ink that has been used in the printing press and printing plate cavity?
Answer: As your company's technical consultant, I once told the boss Zhou and wrote the method and formula for cleaning the printing machine and printing plate ink knot. Now I will introduce it again as follows: Because the ink can be diluted with water or alcohol solvents, printing After finishing, you can use tap water or washing powder to clean the printing machine or printing plate. If it is dried (dried completely) in the plate or the roller of the ink transfer roller, first soak it with butanol or ethanol, and then rub the surface with TM-200S coupling agent, and then rinse it with water.
9. Manager Liao, Wuxi City, Jiangsu Province: Mr. Liu, where can the water-based plastic woven bag ink be bonded by 3B tape without falling off the ink film?
Answer: Water-based plastic woven bags (rotary flexo printing) have been developed for nearly two decades. In the past ten years, weaving woven bags (including woven bags with PE cast surface) have been used for the production of cement woven bags or recycled materials. Ink and wash has been basically finalized.
And now used for high-grade non-PE cast pure white or almost transparent woven bag ink with white oil and nucleating agent, almost no one wants to meet the above requirements in the market. In addition, I understand that a resin and auxiliary produced by Mr. Liu from Xiangfan City, Hubei Province can approach the indicators you require. If you are interested, you can call 15926691614 directly.
10. General Manager Lu of Xiangfan City, Hubei Province: Liu Gong, how to remedy the white spots on the pinhole after printing?
A: Pinholes (white dots), whether full or partial, are collectively referred to as pinholes. If it occurs repeatedly at a certain location, it is often called a mechanical pinhole, which is caused by the aging defect of the printing plate or guide roller; if it is not a white spot of a pinhole that is fixed at a certain location, it is often called a chemical needle The pores are caused by foam in ink. The former pinhole failure can be remedied by cleaning the printing plate or guide roller (or replacing the printing plate or guide roller); the latter needs to add an appropriate amount of defoaming agent to the ink, and isopropyl alcohol can also be used. Part + tributyl phosphate one part mixture, sometimes you must add an appropriate amount of neutralizer to eliminate, but do not use it in excess. Otherwise, the foam cannot be eliminated and will continue to cause chemical pinholes (white spots) in the printed ink film.
11. President Han, Dongguan City, Guangdong Province: Liu Gong, why the viscosity of water-based primary color red ink is much higher than other color inks?
Answer: I tried to print couplets twice at Puxing Aoxing Packaging and Printing Company in Zhejiang Province. As a result, when the operator diluted the water-based primary color red with water and printed it with a solvent-based primary color red viscosity produced by a factory in Jiangshan City, The hue cannot be compared at all. Through this Pujiang trip, he has designed the formula of the primary color of red ink, and tried out the water-based ink pigments of almost all domestic manufacturers. However, the pigment is either swelled due to water absorption or the coloring power is poor after the ink is roughened. For this reason, I have also selected hundreds of dispersants, and their effects are not good. Such as commercially available anti-swelling additives, even water-based DH wax emulsion, the viscosity is reduced, and the resulting color concentration is either light or the peeling strength is almost lost when the film is compounded. The printed ink film appears to be lacking colorants. However, if imported pigments are used, the cost of the primary color of red ink will make the packaging and printing customers unable to bear it.
For this reason, it is recommended that domestic pigment manufacturers explore improvement measures based on the defects of the red pigments needed for ink and wash; satisfying customers is the most wise code of conduct for producers. Applying my motto: "Technological advancement can only be a temporary behavioral lead; and scientific advancement can effectively and efficiently guide technological progress in the long term."
12. Manager Liu of Huaian City, Jiangsu Province asked: Teacher Liu, in order to realize the real environmental protection, safety and pollution-free of the graphic ink film for packaging printing, can you provide the name and value of the solvent residue in the ink system?
Answer: The order of the most easily remaining solvents is: acetone (10.2) <-> cyclohexane (5.9) <-> ethyl acetate (4.8) <-> methyl ethyl ketone (4.5) <-> methanol (4.1) <-> N-heptane (3.3) <-> toluene (2.3) <-> xylene (0.8) <-> cyclohexanone (0.2). The former is the one with a large residual amount, and the latter is the solvent that is least likely to remain, that is, the solvent with a small residual amount. After you do the test and comparison, please dilute the printing ink according to the actual solvent residue.
13. Mr. Chen from Nanyang City, Henan Province asked: Liu Gong, how to achieve the gray balance when the colors of printing overprint are juxtaposed?
A: After juxtaposing the ink colors of printing overprint, the hue generation effect is as follows: 1. After red ink + yellow ink, red tends to purple and yellow tends to green; 2. after red ink + blue ink, red tends to Orange and cyan tend to green; 3. After yellow ink + blue ink, yellow tends to orange and blue tends to purple; 4. after red ink + green ink, red is more red and green is more vivid; 5. blue ink + orange After the ink, blue is bluer and orange is more vivid; 6. After yellow ink + purple ink, yellow is more yellow and purple is more vivid; 7. After red ink + orange ink, red ink is purple and orange is yellow; 8 After red ink + purple ink, red ink tends to orange, purple tends to blue; 9. yellow ink + green ink, yellow tends to orange, green tends to blue; 10. yellow ink + orange ink, yellow Tend to green, orange to yellow; 11. After blue ink + green ink, blue tends to purple, green tends to red; 12. After blue ink + purple ink, blue tends to cyan, purple tends to red; 13 After orange ink + green ink, orange tends to red, green tends to red; 14. After orange ink + purple ink, orange tends to yellow, purple tends to 15. Green and purple ink, green tends to yellow, purple tends to red; 16. Red orange ink + yellow orange ink, red orange tends to red, yellow orange tends to yellow; 17 yellow green ink + blue After purple ink, yellow-green tends to yellow, blue-green tends to blue; 18. After red-violet ink + blue-violet ink, red-purple tends to red, blue-purple tends to blue; 19. after black ink + red ink, Black has green taste, red is more vivid and more orange; 20. Black ink + yellow ink, black has purple taste, yellow is more vivid; 21. Black ink + blue ink, black has orange taste, blue is more vivid ; 22. After black ink + purple ink, black has blue taste, purple is brighter and more inclined to yellow; 23. after black ink + green ink, black has red taste, green is more vivid; 24. after black ink + purple ink , Black has yellow smell, purple is more vivid; 25. White ink + red ink, white has green smell, red tends to red-gray; 26. White ink + blue ink, white has purple smell, yellow tends to yellow-brown; 27. After white ink + blue ink, white has orange flavor, blue tends to blue-gray; 28. After white ink + orange ink, white has blue flavor, orange tends to orange Color;. After 29 White + green ink, red white flavor, green greenish gray tends;. After 30 White + purple ink, yellow white taste, tends purple purple gray.
14. General Manager of Zhengzhou City: Liu Gong, why does the single-color have no peeling strength after the casting film is compounded, but the peeling degree is good after the ink register?
Answer: First, there is too little binder resin in the ink system, and second, the ink system is similar to the one mentioned in the above 10 question, because some active additives are used improperly or excessively.
15. Mr. Mi from Xi'an: Mr. Liu, how can I remedy the poor gloss after printing with black ink?
Answer: In addition to the second question in this article, you should also pay attention to: When formulating the ink, try to design a gradient mixed solvent at the evaporation rate of the connecting medium in the ink system, so that the ink film is completely dry on the surface and the inside. Or increase the resin content or increase the printing pressure remedy.
16. The director of Yuncheng City Sun asked: Liu Gong, what kind of printing inks should I produce now?
A: The production of water-based packaging printing inks with low carbon emissions is not only beneficial to the development of the enterprise, but also can take the responsibility of environmental protection, safety, and pollution-free, in order to demonstrate the behavior of an entrepreneur.
17. General Manager of Yishui Yang, Linyi City, Shandong Province: Liu Gong, I am sorry to ask you again, how to control the stability of printing ink?
A: According to the author's decades of experience, the key to controlling the stability of printing ink is the pH value, followed by the control of the wettability of the binder and the pigment. This is done by carrying out destructive tests on each formula under high temperature and low temperature environments, and then doing physical index inspection, storage time, and printability record records after ink properties are restored. It is a scientific method to choose the desired ink formula through comparison.
18. Mr. Cao, General Manager of Zhongda Chemical Industry, Anqing City, Anhui Province: Teacher Liu, is there any correlation between poor ink overprint and binder resin?
Answer: For a long time, this problem has always troubled us, so we dare not take the risk of R & D on ink painting. Because of the high tension of ink, it is even more difficult to apply it to non-absorbent, non-polar plastic flexible packaging. Peking University has launched a resin with a core-shell structure. Although the effect is good, the film drying is too slow. It can only print about 30 ~ 40m per minute, which is not conducive to modern high-speed printing production processes. Although people have used emulsion + resin solution to improve and adapt to overprinting in recent years, they have not achieved the same overprint quality as solvent printing inks.
From the printing suitability of a single color to the adaptability of all colors, it is still necessary for our colleagues to accumulate experience in each of the ink and ink technical indicators, and boldly communicate and communicate, and sooner or later will reach the other side of success.
19. Mr. Pan from Chongqing asked: Mr. Liu, how much can I invest in printing ink production? And this product does not produce carbon dioxide during manufacturing and printing?
A: A small-scale production of water-based UV offset offset inks, or water-based flexographic letterpress carton woven bag inks or water-based gravure printing flexible packaging plastic inks, or water-based screen printing leather products inks, or water-based indoor and outdoor inkjet inks, or water-based coding inks. Family workshop-type enterprises with an investment of at least 100,000.
Any of these products will produce carbon dioxide more or less. But compared with the traditional ink, the harmful gas is much less. For example, solvent-based gravure inks contain about 55% of volatile components, and the total content of volatile components emitted when diluted printing is dry can reach about 75%; and thermoset offset offset inks due to solvents in the ink system. The process is about 270 ° C. When the ink is dried, 0.3 kg of VOC substance is released per kilogram. In contrast, printing ink is a friendly product.
The process of ink manufacturing and printing requires water + alcohol solvent or water + cleaning agent to clean the printing press and printing plate. The consumption of water resources is negligible, but 80% of the carbon dioxide produced in the production cycle comes from the printing process. Ink drying. As a degree of electricity in the power grid can lead to the production of about 500g of carbon dioxide, that is to say, each ton of ink and water is produced until the end of printing is used to emit about 1.5t of carbon dioxide. The problem that ink and wash really need to solve at present is: one ink can be used for multiple purposes, can be recycled, and can be printed at high and low speeds.

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