After coating is dried, some coatings often have defects such as air bubbles, shrinkage holes, defects, wrinkles, orange peel, and grain lines. We often adjust the resin, solvent, and Other components, and add certain additives to make Smooth coating, no bubbles, good leveling. Ink is a special paint used for printing, and usually does not allow the above-mentioned defects. But sometimes we consciously highlight individual advantages in paint or exaggerate certain shortcomings to achieve a special decorative effect.
UV-curable ink (UV ink) is an environmentally-friendly ink that has little or no solvent pollution and saves energy. It has the characteristics of instant curing, and is more conducive to highlighting the advantages of mediation in ink or exaggerating certain disadvantages. This article reviews UV-cured screen printing decorative inks, focusing on the mechanism, performance, and application skills of certain UV decorative inks developed by the company.
First, UV screen printing local polish
Coatings have high gloss, matt, and no light. If we adjust the paint formula to highlight its high light, it will become a polishing agent. In screen printing, a scraper is used to transfer the ink through the screen to the substrate. During the process, the screen must come into instant contact with the substrate, and then separate. It is easy to bring air into the coating, which is especially easy to generate bubbles and shrinkage. Holes and other defects, coupled with the bright surface of the coating, very small defects will be clearly exposed, for this screen printing partial polishing agent and other UV polishing agent (such as offset glazing agent, flexo glazing agent, PVC buckle Different light agents, etc.) need to have special fluidics properties.
To evaluate the quality of the UV screen printing ink coating agent, in addition to testing its adhesion fastness, curing speed, with or without bubbles, shrinkage holes, flaws and other defects, but also to evaluate the coating brightness and fullness. Luminance, which is the reflectivity of the ink against light, can be measured using an instrument, but it is more intuitive to use the printing effect of the two inks. There is no method for quantitative test of fullness. By visual observation, even a thin, full layer of ink appears to be quite thick.
Our company currently produces two types of UV screen printing agents. The G-1 type is used for partial coating of paper. Its lightness and fullness are good. The degree should be used for the partial painting of pictures on pictures, pictorials, etc. The effect is as good as that of photos. It can also be used for cosmetics and other packaging, the effect is very elegant. The Shanghai People's Printing Factory printed the “Fannidi Acid Essence†printed by the Tenth Factory and the “International Coin Passport†was printed on this ink. The G-2 type is used for plastic sub-film printing and has good fastness, but the coating effect is not as good as the G-1 type.
Second, UV imitation etching screen printing ink
If impurities are contained in the paint, defects will occur and the light will be scattered. For example, we simply add a lot of “impurities†to the ink to make it produce many small particles by screen printing. It can be printed on general cardboard and can produce sand surface effects, such as those printed on high-gloss gold and silver mirror paper. The small particles in the ink diffusely scatter light, and it looks as if the mirror surface has been eroded away. This creates a concave illusion that is not applied to the ink pattern. Because of the high gloss of the cardboard, it feels convex. This is Imitation etch screen printing ink mechanism.
A UV-type etched screen printing ink with excellent performance must first have a good distribution of particles and a three-dimensional effect, so that a satisfactory artistic effect can be produced after printing. But also have a very high adhesion and softness, many branded wine boxes to be seamed, such as softness will not burst, will seriously affect product quality. In addition, fast curing, long storage period, good hand feeling, and not too rough, otherwise rolling in the cigarette packaging production line will occur. Inks used for printing cigarettes, foods, and other packaging have to have low odor. Ink is very important for the safety of the human body. At present, some ink manufacturers must pay attention to the interests of workers and users in order to pursue profits.
The UV imitation etching screen printing inks developed and produced by the company are mainly A-2 type, which has good etching effect, excellent fastness and softness, and is used in the packaging of high-grade cigarettes, wine, supplements, food, cosmetics, and clothing. For instance, many brands such as Maotai and Quanxing, Shenxiang Pai Ginseng Pills, Gold Multi Target Slimming Tea, Red Hibiscus and other cigarettes, and Jin Yangrong warm clothing are all printed using this type of ink. Type A-3 is a low-odor ink, mainly used for printing cigarette labels, and its softness is less than that of A-2 type. B-type inks are mainly used for printing alcoholic beverages, such as Sihaichun, Wuliangchun, Jinliufu, and old workshops. Some factories also use it for printing moon cake boxes, etc. The price is lower than that of the A type. C-type is a low-grade ink, although the price is low, but the performance is not A and B type, not recommended. Type D is a foaming ink. The etching particles are very rough and have special effects. E-type is ultra-fine ink, its grainy feeling is very delicate, uniform, and no residual wine, but the cost is expensive, it is only recommended for some special requirements of high-grade packaging.
UV imitation etching ink printed on gold and silver mirror card paper, can be similar to the mirror etched effect. It can also be printed on cardboard coated with colored ink to produce special artistic effects. Jinliufu, old workshops and other wine boxes are printed in this way. For example, in the ordinary card paper, the pattern is first printed with imitation etching ink, and the color paste is printed again. The flavor is unique, and the Biluochun tea packaging printed by this method is unanimously praised. After the color paste is transferred into the etched ink and printed, the velvety effect can be obtained and it can be tried. However, attention should be paid to adding the amount of the color paste so as to avoid difficulty in curing.
Third, UV coral ink
The presence of air bubbles in the coating is a headache. However, if there are a large number of bubbles in the coating that gather together and form a pattern, special decorative effects can be produced. UV coral inks are made using this principle. Coral ink is also known as pearl ink, because it is thickly printed, bubbles gather to form a coral-like pattern; printed thin, forming a small pearl-like, but also have a flavor.
The use of coral ink should pay attention to the required pattern to select the screen mesh number, such as to print thick corals, the screen is used more rough, squeegee knife blunt; if you want to print a small pearl, you can use 250 or 300 wire network.
Fourth, UV flash ink
Flash ink is made by adding some scintillator cloth to the paint. When the general scintillator is thicker, the flash effect is better, but it is difficult to pass through the screen. This is a contradiction. For this reason, the use of a scintillator that is both fine and has a good flash effect is the key to the manufacture of high-quality flash ink. Of course, the production cost is also Higher.
After printing with glitter ink, there are many glittering dots in the prints, which are very beautiful when viewed in the sun. It can also be mixed into transparent red, transparent blue and other color inks to make the color ink more beautiful. General 200 mesh screen printing, with 80W/cm medium pressure mercury lamp, 10cm apart, 3 ~ 6s curing. Since the scintillator is prone to precipitation, the ink must be thoroughly stirred well before use.
Five, UV gem ink
Gem ink is also called marble ink. It is characterized by good thixotropic properties and can print very thick patterns. It is generally used to print the outline of a pattern or a local area of ​​the pattern, making the pattern appear full and thick. If you print the red and yellow color halo on the gold and silver mirror paper, then use the 300 mesh screen with radial strips above, UV gem ink overprint, you can get a beautiful laser-like pattern, red hibiscus cigarettes in the standard is Printed using this method.
Six, UV wrinkle ink
When the paint is dry, if the shrinkage of the surface layer and the bottom layer is different, wrinkle defects will occur, and the wrinkle paint will consciously highlight the wrinkling phenomenon and achieve a unique decorative effect. Wrinkle paint has long existed. In the past, it was used for painting punching machines and electrical equipment. The packaging industry has been developed in recent years. The wrinkle paint needs high temperature baking to get satisfactory wrinkles, and the packaging decoration is printed on paper. After baking at high temperature, the paper must be severely deformed and even brittle. For this reason, UV curing wrinkle ink has been developed, which has practical value.
After the UV wrinkle ink is printed, it must be irradiated with a low-pressure mercury lamp to partially cure the ink surface, and then irradiated with a medium-pressure mercury lamp to completely cure. The UV curing ink produced by our company has a faster curing speed and can be cured at 80m/cm lamp at 15m/min. The thickness and arrangement of wrinkles obtained by printing have a great relationship with the thickness of the ink layer, low-pressure mercury lamp irradiation, etc., and must be practiced to achieve satisfactory results.
Seven, UV ice ink
When some paints are dry, especially by the influence of nitrogen dioxide, sulfur dioxide, carbon dioxide and other gases, the surface of the coating film will have a crystal pattern. Crystal lines, frosts, reticulate lines, and silk lines are all different forms of wrinkles and are a defect in paint. However, if you can control the conditions, the proper formation of crystal lines in the coating, you can produce a crystal clear and similar to the ice flower decorative effect.
Ice printing inks have been in the country for many years, both for heat curing and UV curing, but they are only used for small batch printing and have not been used in large quantities in the packaging industry. The main reason is that the UV irradiation time required for producing ice flower is too long, the production efficiency is too low, the energy consumption is too high, and the paper is easily deformed. For example, one company adopts a UV ice print ink produced by a company and uses 9 sets of 7.2 kW medium-pressure mercury lamps to cure 54 cm×39 cm prints. The output per hour is only 600, and the energy consumption and production cost are too high. For this reason, we must develop a fast-curing ice-ink, and our company has also invested a lot of effort in research, and has obtained faster-curing inks, but the resulting grain pattern is still not satisfactory and needs improvement.
With the continuous development of science and technology, more and more high-quality products have appeared in the market, and at the same time, higher requirements have been placed on the packaging of products. At the 2000 Conference of the China Screen Printing and Imaging Association held in Dalian in July this year, according to experts, the printing industry has become the third largest industry in the world after autos and petrochemicals, and the packaging industry accounts for almost Half of the printing industry, it has broad prospects for development. UV screen printing decorative ink can make the product packaging more beautiful and new shape.
The above describes the 7-inch UV screen printing ink developed and produced by our company. If we can make full use of the various characteristics of the coating, new varieties can emerge one after another, and we can also use the above-mentioned several inks through careful design. Get a more beautiful printing effect.
UV-curable ink (UV ink) is an environmentally-friendly ink that has little or no solvent pollution and saves energy. It has the characteristics of instant curing, and is more conducive to highlighting the advantages of mediation in ink or exaggerating certain disadvantages. This article reviews UV-cured screen printing decorative inks, focusing on the mechanism, performance, and application skills of certain UV decorative inks developed by the company.
First, UV screen printing local polish
Coatings have high gloss, matt, and no light. If we adjust the paint formula to highlight its high light, it will become a polishing agent. In screen printing, a scraper is used to transfer the ink through the screen to the substrate. During the process, the screen must come into instant contact with the substrate, and then separate. It is easy to bring air into the coating, which is especially easy to generate bubbles and shrinkage. Holes and other defects, coupled with the bright surface of the coating, very small defects will be clearly exposed, for this screen printing partial polishing agent and other UV polishing agent (such as offset glazing agent, flexo glazing agent, PVC buckle Different light agents, etc.) need to have special fluidics properties.
To evaluate the quality of the UV screen printing ink coating agent, in addition to testing its adhesion fastness, curing speed, with or without bubbles, shrinkage holes, flaws and other defects, but also to evaluate the coating brightness and fullness. Luminance, which is the reflectivity of the ink against light, can be measured using an instrument, but it is more intuitive to use the printing effect of the two inks. There is no method for quantitative test of fullness. By visual observation, even a thin, full layer of ink appears to be quite thick.
Our company currently produces two types of UV screen printing agents. The G-1 type is used for partial coating of paper. Its lightness and fullness are good. The degree should be used for the partial painting of pictures on pictures, pictorials, etc. The effect is as good as that of photos. It can also be used for cosmetics and other packaging, the effect is very elegant. The Shanghai People's Printing Factory printed the “Fannidi Acid Essence†printed by the Tenth Factory and the “International Coin Passport†was printed on this ink. The G-2 type is used for plastic sub-film printing and has good fastness, but the coating effect is not as good as the G-1 type.
Second, UV imitation etching screen printing ink
If impurities are contained in the paint, defects will occur and the light will be scattered. For example, we simply add a lot of “impurities†to the ink to make it produce many small particles by screen printing. It can be printed on general cardboard and can produce sand surface effects, such as those printed on high-gloss gold and silver mirror paper. The small particles in the ink diffusely scatter light, and it looks as if the mirror surface has been eroded away. This creates a concave illusion that is not applied to the ink pattern. Because of the high gloss of the cardboard, it feels convex. This is Imitation etch screen printing ink mechanism.
A UV-type etched screen printing ink with excellent performance must first have a good distribution of particles and a three-dimensional effect, so that a satisfactory artistic effect can be produced after printing. But also have a very high adhesion and softness, many branded wine boxes to be seamed, such as softness will not burst, will seriously affect product quality. In addition, fast curing, long storage period, good hand feeling, and not too rough, otherwise rolling in the cigarette packaging production line will occur. Inks used for printing cigarettes, foods, and other packaging have to have low odor. Ink is very important for the safety of the human body. At present, some ink manufacturers must pay attention to the interests of workers and users in order to pursue profits.
The UV imitation etching screen printing inks developed and produced by the company are mainly A-2 type, which has good etching effect, excellent fastness and softness, and is used in the packaging of high-grade cigarettes, wine, supplements, food, cosmetics, and clothing. For instance, many brands such as Maotai and Quanxing, Shenxiang Pai Ginseng Pills, Gold Multi Target Slimming Tea, Red Hibiscus and other cigarettes, and Jin Yangrong warm clothing are all printed using this type of ink. Type A-3 is a low-odor ink, mainly used for printing cigarette labels, and its softness is less than that of A-2 type. B-type inks are mainly used for printing alcoholic beverages, such as Sihaichun, Wuliangchun, Jinliufu, and old workshops. Some factories also use it for printing moon cake boxes, etc. The price is lower than that of the A type. C-type is a low-grade ink, although the price is low, but the performance is not A and B type, not recommended. Type D is a foaming ink. The etching particles are very rough and have special effects. E-type is ultra-fine ink, its grainy feeling is very delicate, uniform, and no residual wine, but the cost is expensive, it is only recommended for some special requirements of high-grade packaging.
UV imitation etching ink printed on gold and silver mirror card paper, can be similar to the mirror etched effect. It can also be printed on cardboard coated with colored ink to produce special artistic effects. Jinliufu, old workshops and other wine boxes are printed in this way. For example, in the ordinary card paper, the pattern is first printed with imitation etching ink, and the color paste is printed again. The flavor is unique, and the Biluochun tea packaging printed by this method is unanimously praised. After the color paste is transferred into the etched ink and printed, the velvety effect can be obtained and it can be tried. However, attention should be paid to adding the amount of the color paste so as to avoid difficulty in curing.
Third, UV coral ink
The presence of air bubbles in the coating is a headache. However, if there are a large number of bubbles in the coating that gather together and form a pattern, special decorative effects can be produced. UV coral inks are made using this principle. Coral ink is also known as pearl ink, because it is thickly printed, bubbles gather to form a coral-like pattern; printed thin, forming a small pearl-like, but also have a flavor.
The use of coral ink should pay attention to the required pattern to select the screen mesh number, such as to print thick corals, the screen is used more rough, squeegee knife blunt; if you want to print a small pearl, you can use 250 or 300 wire network.
Fourth, UV flash ink
Flash ink is made by adding some scintillator cloth to the paint. When the general scintillator is thicker, the flash effect is better, but it is difficult to pass through the screen. This is a contradiction. For this reason, the use of a scintillator that is both fine and has a good flash effect is the key to the manufacture of high-quality flash ink. Of course, the production cost is also Higher.
After printing with glitter ink, there are many glittering dots in the prints, which are very beautiful when viewed in the sun. It can also be mixed into transparent red, transparent blue and other color inks to make the color ink more beautiful. General 200 mesh screen printing, with 80W/cm medium pressure mercury lamp, 10cm apart, 3 ~ 6s curing. Since the scintillator is prone to precipitation, the ink must be thoroughly stirred well before use.
Five, UV gem ink
Gem ink is also called marble ink. It is characterized by good thixotropic properties and can print very thick patterns. It is generally used to print the outline of a pattern or a local area of ​​the pattern, making the pattern appear full and thick. If you print the red and yellow color halo on the gold and silver mirror paper, then use the 300 mesh screen with radial strips above, UV gem ink overprint, you can get a beautiful laser-like pattern, red hibiscus cigarettes in the standard is Printed using this method.
Six, UV wrinkle ink
When the paint is dry, if the shrinkage of the surface layer and the bottom layer is different, wrinkle defects will occur, and the wrinkle paint will consciously highlight the wrinkling phenomenon and achieve a unique decorative effect. Wrinkle paint has long existed. In the past, it was used for painting punching machines and electrical equipment. The packaging industry has been developed in recent years. The wrinkle paint needs high temperature baking to get satisfactory wrinkles, and the packaging decoration is printed on paper. After baking at high temperature, the paper must be severely deformed and even brittle. For this reason, UV curing wrinkle ink has been developed, which has practical value.
After the UV wrinkle ink is printed, it must be irradiated with a low-pressure mercury lamp to partially cure the ink surface, and then irradiated with a medium-pressure mercury lamp to completely cure. The UV curing ink produced by our company has a faster curing speed and can be cured at 80m/cm lamp at 15m/min. The thickness and arrangement of wrinkles obtained by printing have a great relationship with the thickness of the ink layer, low-pressure mercury lamp irradiation, etc., and must be practiced to achieve satisfactory results.
Seven, UV ice ink
When some paints are dry, especially by the influence of nitrogen dioxide, sulfur dioxide, carbon dioxide and other gases, the surface of the coating film will have a crystal pattern. Crystal lines, frosts, reticulate lines, and silk lines are all different forms of wrinkles and are a defect in paint. However, if you can control the conditions, the proper formation of crystal lines in the coating, you can produce a crystal clear and similar to the ice flower decorative effect.
Ice printing inks have been in the country for many years, both for heat curing and UV curing, but they are only used for small batch printing and have not been used in large quantities in the packaging industry. The main reason is that the UV irradiation time required for producing ice flower is too long, the production efficiency is too low, the energy consumption is too high, and the paper is easily deformed. For example, one company adopts a UV ice print ink produced by a company and uses 9 sets of 7.2 kW medium-pressure mercury lamps to cure 54 cm×39 cm prints. The output per hour is only 600, and the energy consumption and production cost are too high. For this reason, we must develop a fast-curing ice-ink, and our company has also invested a lot of effort in research, and has obtained faster-curing inks, but the resulting grain pattern is still not satisfactory and needs improvement.
With the continuous development of science and technology, more and more high-quality products have appeared in the market, and at the same time, higher requirements have been placed on the packaging of products. At the 2000 Conference of the China Screen Printing and Imaging Association held in Dalian in July this year, according to experts, the printing industry has become the third largest industry in the world after autos and petrochemicals, and the packaging industry accounts for almost Half of the printing industry, it has broad prospects for development. UV screen printing decorative ink can make the product packaging more beautiful and new shape.
The above describes the 7-inch UV screen printing ink developed and produced by our company. If we can make full use of the various characteristics of the coating, new varieties can emerge one after another, and we can also use the above-mentioned several inks through careful design. Get a more beautiful printing effect.
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