Abstract: The combination ink is a new technology that has just been successfully developed in recent years and has great potential for development. This article mainly introduces the background and technical advantages of the development of the composite ink technology, and focuses on the analysis of its development trend and several factors that need to be considered when it is applied.
Since more than 20 years after the birth of UV inks, ink manufacturers have been working on the development of composite ink technology as a new technology with great potential for growth. Although this new type of ink technology has been successfully developed in recent years, and all parties have different views on it, however, most people think that the combination of ink technology will have a bright future.
Background of Technology Development for Combination Oil Production Since the late 1960s, UV technology with high gloss, instant drying, and good wear resistance has gradually established a firm position in the coating of printed materials. However, when trying to apply UV coatings to traditional printing ink layers, the situation is extremely unsatisfactory. Due to the large differences in chemical composition between UV coatings and conventional inks, incompatibility between the two affects the coating adhesion.
The printers also found that the high gloss of printed products just after finishing the coating process is difficult to maintain. With the difference in hiding power, formula, substrate and printing process, the surface gloss may drop by nearly 30 points. It is believed that the decrease in the gloss of printed products may be caused by a decrease in the gloss uniformity of the surface of the printed product. The gloss lost in the areas with darker ink and thicker ink layers is greater, while the gloss in the thinner ink layers and non-printed surfaces can be maintained well. This change in gloss after coating treatment, and the unpredictability of this change in gloss, place printers in an awkward position.
However, printers also found that if the printing ink can be fully dried before UV coating, the final print will have a good gloss effect. However, there is a problem that the conventional printing ink needs to be dusted during the drying process to prevent back rubbing. When the dried printing material is sent to the UV coating in this way, the dust particles adhere to the paper. The surface, which gives a fine wrinkle to the smooth UV coating, is also unsatisfactory.
In order to overcome this problem, printers have also found a way to apply a layer of water-based paint on the printed sheets. This can greatly reduce the amount of dust required for drying and achieve a satisfactory coating gloss. However, this method requires the printed product to be coated again by a printing press, or a special coating machine is used for the UV coating of the commercial machine. However, it takes more labor, equipment, materials, and time to go through paper coating or offline coating, which increases the cost of the product.
In an attempt to address these deficiencies, some printer manufacturers have developed a press with two coating units. After the printing is completed, the sheets continue to pass through the two coating units to complete two coats on the traditional printing ink layer. For the first time, water-based coating was applied to a conventional ink ink layer, followed by UV coating to obtain a high-gloss print.
This sounds good, but it is not always easy to do it. The question is still whether the water paint can be completely dry. The actual drying of the waterborne coating requires that the acrylic emulsion in the coating be fully integrated, which inevitably brings about problems in the printing process due to the speed of printing. Despite the introduction of multi-unit printing presses for multi-coating machines, and many attempts have also been made, this method still has a gap in quality compared with on-line coating. Although such printing and coating methods do have some successful examples in actual production, this method has proved to be imperfect with respect to the various types of printing and printing that printers face.
Combinatorial Ink Technology Birth As equipment manufacturers try to make continuous improvements to printing and coating equipment, paint and ink manufacturers are also experimenting with changing materials and process recipes to achieve UV in-line coating on traditional ink layers. Just a few years ago, improvements in ink formulation achieved initial success by combining traditional printing inks with UV material components. The experimental results obtained with this combination of inks are encouraging, but problems still exist. . This combination ink has poor printability on a printing press, poor stability in the ink tank, poor gloss uniformity, and the like. However, in the course of the experiment, it was found that if the UV lamp is placed in front of the UV coating unit, the combined ink can be sufficiently dried to obtain a very high gloss of the UV coating. It is based on this discovery, ink manufacturers finally developed a new generation of combination ink technology.
The purpose of the development of composite ink technology is to improve the gloss of printed products, and the high gloss obtained by the combination of ink technology is the key to solving the problem. With the advent of combination ink technology, printers can now obtain high gloss for UV coating with less investment, opening up a large number of new market opportunities for printers.
The so-called combination ink technology actually combines the traditional ink with a sufficient amount of the UV material component, and before the UV ink coating is applied after the combination ink is printed, the ink layer is thoroughly dried with a UV lamp, and subsequently coated. After the UV coating has been applied and dried, a very uniform high-gloss surface can be obtained for the final print. Traditional UV inks are not as good as traditional inks in terms of dot gain, color registration, and print contrast. The combination ink technology is similar to traditional inks in these respects, and it is obviously better than simply using UV ink technology.
For example, the Hy-Bryte combination ink technology developed by Sun Chemical Co., Ltd. combines traditional inks with a sufficient amount of UV material components, and after the printing is completed, the UV ink is used to illuminate the ink layers to make them fully dry. The UV coating is then applied and dried, and the final print has a very uniform high gloss. Although the high gloss that can be achieved also depends on the type of UV coating, substrate, and coater used, at least high gloss of up to 90S can be guaranteed.
The Advantages of Combinatorial Ink Technology Combining ink technology may eventually replace the traditional printing UV glazing technology. Some printers that have adopted the combined ink technology have achieved great success.
(1) More suitable for on-line UV coating UV system has four basic applications: after printing with oil-based inks, on-line coating of water-based coatings and UV coatings (this requires two printing presses for the coating unit); oil-based inks are printed off after printing Machine UV coating; In-line coating after UV ink printing; or UV coating after printing in combination ink. The first two applications increase the number of additional processing steps due to the addition of units or the use of off-line UV coating, which increases the cost of processing, and the application of the combination ink technology eliminates these additional processing steps.
The combination ink technology enables full in-line UV coating. Because the combination ink can be completely dried in an instant, the ink drying speed can be fully matched with in-line coating, thereby avoiding the extra production cost of offline coating. Compared with the traditional ink and light technology, the combination ink technology reduces the drying time and shortens the production cycle, and actually accelerates the speed of the printing product. At the same time, the combination ink technology can use the traditional printing ink roller and also reduce the preparation time of the printing job.
Combination inks can also be used with aqueous coatings. Existing printers have found that fully dried inks also have good adhesion to aqueous coatings and can improve surface gloss and coating properties. Although its surface gloss is not as high as the gloss of the UV coating, it is better than the gloss of the water-based coating on the conventional ink. Another advantage is that the combination ink can be dried quickly after it has been machined and has good adhesion. This is because the drying of the traditional ink film needs to be dried by hydriding and drying, and the reduction of the conventional ink composition in the ink composition and the sufficient amount of the UV material component, as well as the use of UV drying lamps, greatly accelerate the drying of the ink and greatly increase the printing speed.
(2) At least the probing time and higher gloss combination ink technology facilitates UV coating without the need for additional precoating with an aqueous coating. The original use of water-based paint is to solve the incompatibility between the UV coating and the traditional oily ink, but it will cause the gloss of the ink layer to decrease. Since the in-line coating is realized by the combination ink technology, there is no need for a conventional off-line coating or pre-water-based coating, and the print quality is comparable to that of a conventional offset printing ink.
After UV coating, the decrease of gloss of printed products has always been a focus of people's attention, especially in areas where the printing ink layer is thick. The gloss of traditional offset printing inks after UV coating drying is reduced by more than 3O points, while the combination ink technology only reduces a few points, thus maintaining most of the high gloss of printed products.
Printers who are now using UV technology do not have to invest in dedicated drying and printing equipment for the combination ink technology. Traditional printers that do not use UV technology only need to invest in UV drying lamps. Only a few lights may be needed to dry a print on a thicker ink layer, which may add some additional investment.
It can be seen that the use of combination ink technology also has the most basic requirement, that is, after the last group of printing units, at least one UV lamp should be installed before the UV coating unit. Depending on the printing speed at that time and the ink coverage of the specific print, it may be necessary to add a second light to prevent the gloss from decreasing. Of course, there is also a need for a group of coating units that can provide suitable coating capabilities, as well as a suitable number of UV lamps at the end of the printing press to allow complete drying of the UV coating at normal printing speeds.
The structure of the printer using the combined ink technology can be varied, and the most typical is to install a UV drying lamp before and after the UV coating unit. Although it is not necessary to install UV lamps between the units, some printers have found that installing several UV lamps in other units of the printer is beneficial. At least now printers have installed active UV lamp groups that can be placed where they are needed most.
(3) Simpler, More Efficient Process Combination Ink Technology In addition to the high gloss of printed products, this processing system has other important influences on the printing industry. The combined ink technology can use ordinary printing ink rollers and printing blankets. However, this does not mean that any type of ink roller or blanket can be well used with the combination ink technology. Just as some ink rollers and blankets are more suitable for traditional ink printing, the use of a suitable ink roller or blanket can achieve better print quality and longer material life. The key to combined ink technology is that printing does not require special ink rollers and blankets, as it does with UV inks. This allows printers to use the combined ink technology when applying in-line coating without using in-line coating and traditional inks. Also, no special fountain solution is required for printing.
Printers using combination ink technology have noticed that their printing operability has greatly improved compared to conventional UV printing. Many printers who had previously not been able to use UV printing are now excited because they can now print UV-coated high-gloss prints on existing offset presses simply by adding a few UV lamps. Combined ink technology can also be used on conventional printers just like traditional inks. Typical UV inks have less tolerance for ink balance in the application and the ink balance during the printing process is more difficult to control. The use of combination inks is as convenient as ordinary inks. The printability of UV inks is not good, and it is inferior to traditional inks in terms of dot gain, color registration, print contrast and other qualities. In most cases, the combination ink is similar to the printability of the conventional ink. Since the UV component of the combination ink will only dry out when exposed to the light energy of the UV lamp, the combination ink remains in a liquid state during use on the printing press, so that there is no fear of on-machine crusting as with conventional inks.
Combining inks significantly reduces waste compared to UV inks. Due to the greater latitude of ink use, print quality may be better. According to a printer using a combination ink technology, his printing profit in the previous year increased by 18%, mainly because he used in-line coating of a combination of inks to obtain high-gloss printing products, so he did not have to seek external processing. . More and more printers are now turning to the use of group ink technology, which can significantly increase the value of printed products and increase profits.
Whether the combination of ink technology can become a sustainable development of the technical combination of ink technology is the inadequacy of the traditional offset printing
Since more than 20 years after the birth of UV inks, ink manufacturers have been working on the development of composite ink technology as a new technology with great potential for growth. Although this new type of ink technology has been successfully developed in recent years, and all parties have different views on it, however, most people think that the combination of ink technology will have a bright future.
Background of Technology Development for Combination Oil Production Since the late 1960s, UV technology with high gloss, instant drying, and good wear resistance has gradually established a firm position in the coating of printed materials. However, when trying to apply UV coatings to traditional printing ink layers, the situation is extremely unsatisfactory. Due to the large differences in chemical composition between UV coatings and conventional inks, incompatibility between the two affects the coating adhesion.
The printers also found that the high gloss of printed products just after finishing the coating process is difficult to maintain. With the difference in hiding power, formula, substrate and printing process, the surface gloss may drop by nearly 30 points. It is believed that the decrease in the gloss of printed products may be caused by a decrease in the gloss uniformity of the surface of the printed product. The gloss lost in the areas with darker ink and thicker ink layers is greater, while the gloss in the thinner ink layers and non-printed surfaces can be maintained well. This change in gloss after coating treatment, and the unpredictability of this change in gloss, place printers in an awkward position.
However, printers also found that if the printing ink can be fully dried before UV coating, the final print will have a good gloss effect. However, there is a problem that the conventional printing ink needs to be dusted during the drying process to prevent back rubbing. When the dried printing material is sent to the UV coating in this way, the dust particles adhere to the paper. The surface, which gives a fine wrinkle to the smooth UV coating, is also unsatisfactory.
In order to overcome this problem, printers have also found a way to apply a layer of water-based paint on the printed sheets. This can greatly reduce the amount of dust required for drying and achieve a satisfactory coating gloss. However, this method requires the printed product to be coated again by a printing press, or a special coating machine is used for the UV coating of the commercial machine. However, it takes more labor, equipment, materials, and time to go through paper coating or offline coating, which increases the cost of the product.
In an attempt to address these deficiencies, some printer manufacturers have developed a press with two coating units. After the printing is completed, the sheets continue to pass through the two coating units to complete two coats on the traditional printing ink layer. For the first time, water-based coating was applied to a conventional ink ink layer, followed by UV coating to obtain a high-gloss print.
This sounds good, but it is not always easy to do it. The question is still whether the water paint can be completely dry. The actual drying of the waterborne coating requires that the acrylic emulsion in the coating be fully integrated, which inevitably brings about problems in the printing process due to the speed of printing. Despite the introduction of multi-unit printing presses for multi-coating machines, and many attempts have also been made, this method still has a gap in quality compared with on-line coating. Although such printing and coating methods do have some successful examples in actual production, this method has proved to be imperfect with respect to the various types of printing and printing that printers face.
Combinatorial Ink Technology Birth As equipment manufacturers try to make continuous improvements to printing and coating equipment, paint and ink manufacturers are also experimenting with changing materials and process recipes to achieve UV in-line coating on traditional ink layers. Just a few years ago, improvements in ink formulation achieved initial success by combining traditional printing inks with UV material components. The experimental results obtained with this combination of inks are encouraging, but problems still exist. . This combination ink has poor printability on a printing press, poor stability in the ink tank, poor gloss uniformity, and the like. However, in the course of the experiment, it was found that if the UV lamp is placed in front of the UV coating unit, the combined ink can be sufficiently dried to obtain a very high gloss of the UV coating. It is based on this discovery, ink manufacturers finally developed a new generation of combination ink technology.
The purpose of the development of composite ink technology is to improve the gloss of printed products, and the high gloss obtained by the combination of ink technology is the key to solving the problem. With the advent of combination ink technology, printers can now obtain high gloss for UV coating with less investment, opening up a large number of new market opportunities for printers.
The so-called combination ink technology actually combines the traditional ink with a sufficient amount of the UV material component, and before the UV ink coating is applied after the combination ink is printed, the ink layer is thoroughly dried with a UV lamp, and subsequently coated. After the UV coating has been applied and dried, a very uniform high-gloss surface can be obtained for the final print. Traditional UV inks are not as good as traditional inks in terms of dot gain, color registration, and print contrast. The combination ink technology is similar to traditional inks in these respects, and it is obviously better than simply using UV ink technology.
For example, the Hy-Bryte combination ink technology developed by Sun Chemical Co., Ltd. combines traditional inks with a sufficient amount of UV material components, and after the printing is completed, the UV ink is used to illuminate the ink layers to make them fully dry. The UV coating is then applied and dried, and the final print has a very uniform high gloss. Although the high gloss that can be achieved also depends on the type of UV coating, substrate, and coater used, at least high gloss of up to 90S can be guaranteed.
The Advantages of Combinatorial Ink Technology Combining ink technology may eventually replace the traditional printing UV glazing technology. Some printers that have adopted the combined ink technology have achieved great success.
(1) More suitable for on-line UV coating UV system has four basic applications: after printing with oil-based inks, on-line coating of water-based coatings and UV coatings (this requires two printing presses for the coating unit); oil-based inks are printed off after printing Machine UV coating; In-line coating after UV ink printing; or UV coating after printing in combination ink. The first two applications increase the number of additional processing steps due to the addition of units or the use of off-line UV coating, which increases the cost of processing, and the application of the combination ink technology eliminates these additional processing steps.
The combination ink technology enables full in-line UV coating. Because the combination ink can be completely dried in an instant, the ink drying speed can be fully matched with in-line coating, thereby avoiding the extra production cost of offline coating. Compared with the traditional ink and light technology, the combination ink technology reduces the drying time and shortens the production cycle, and actually accelerates the speed of the printing product. At the same time, the combination ink technology can use the traditional printing ink roller and also reduce the preparation time of the printing job.
Combination inks can also be used with aqueous coatings. Existing printers have found that fully dried inks also have good adhesion to aqueous coatings and can improve surface gloss and coating properties. Although its surface gloss is not as high as the gloss of the UV coating, it is better than the gloss of the water-based coating on the conventional ink. Another advantage is that the combination ink can be dried quickly after it has been machined and has good adhesion. This is because the drying of the traditional ink film needs to be dried by hydriding and drying, and the reduction of the conventional ink composition in the ink composition and the sufficient amount of the UV material component, as well as the use of UV drying lamps, greatly accelerate the drying of the ink and greatly increase the printing speed.
(2) At least the probing time and higher gloss combination ink technology facilitates UV coating without the need for additional precoating with an aqueous coating. The original use of water-based paint is to solve the incompatibility between the UV coating and the traditional oily ink, but it will cause the gloss of the ink layer to decrease. Since the in-line coating is realized by the combination ink technology, there is no need for a conventional off-line coating or pre-water-based coating, and the print quality is comparable to that of a conventional offset printing ink.
After UV coating, the decrease of gloss of printed products has always been a focus of people's attention, especially in areas where the printing ink layer is thick. The gloss of traditional offset printing inks after UV coating drying is reduced by more than 3O points, while the combination ink technology only reduces a few points, thus maintaining most of the high gloss of printed products.
Printers who are now using UV technology do not have to invest in dedicated drying and printing equipment for the combination ink technology. Traditional printers that do not use UV technology only need to invest in UV drying lamps. Only a few lights may be needed to dry a print on a thicker ink layer, which may add some additional investment.
It can be seen that the use of combination ink technology also has the most basic requirement, that is, after the last group of printing units, at least one UV lamp should be installed before the UV coating unit. Depending on the printing speed at that time and the ink coverage of the specific print, it may be necessary to add a second light to prevent the gloss from decreasing. Of course, there is also a need for a group of coating units that can provide suitable coating capabilities, as well as a suitable number of UV lamps at the end of the printing press to allow complete drying of the UV coating at normal printing speeds.
The structure of the printer using the combined ink technology can be varied, and the most typical is to install a UV drying lamp before and after the UV coating unit. Although it is not necessary to install UV lamps between the units, some printers have found that installing several UV lamps in other units of the printer is beneficial. At least now printers have installed active UV lamp groups that can be placed where they are needed most.
(3) Simpler, More Efficient Process Combination Ink Technology In addition to the high gloss of printed products, this processing system has other important influences on the printing industry. The combined ink technology can use ordinary printing ink rollers and printing blankets. However, this does not mean that any type of ink roller or blanket can be well used with the combination ink technology. Just as some ink rollers and blankets are more suitable for traditional ink printing, the use of a suitable ink roller or blanket can achieve better print quality and longer material life. The key to combined ink technology is that printing does not require special ink rollers and blankets, as it does with UV inks. This allows printers to use the combined ink technology when applying in-line coating without using in-line coating and traditional inks. Also, no special fountain solution is required for printing.
Printers using combination ink technology have noticed that their printing operability has greatly improved compared to conventional UV printing. Many printers who had previously not been able to use UV printing are now excited because they can now print UV-coated high-gloss prints on existing offset presses simply by adding a few UV lamps. Combined ink technology can also be used on conventional printers just like traditional inks. Typical UV inks have less tolerance for ink balance in the application and the ink balance during the printing process is more difficult to control. The use of combination inks is as convenient as ordinary inks. The printability of UV inks is not good, and it is inferior to traditional inks in terms of dot gain, color registration, print contrast and other qualities. In most cases, the combination ink is similar to the printability of the conventional ink. Since the UV component of the combination ink will only dry out when exposed to the light energy of the UV lamp, the combination ink remains in a liquid state during use on the printing press, so that there is no fear of on-machine crusting as with conventional inks.
Combining inks significantly reduces waste compared to UV inks. Due to the greater latitude of ink use, print quality may be better. According to a printer using a combination ink technology, his printing profit in the previous year increased by 18%, mainly because he used in-line coating of a combination of inks to obtain high-gloss printing products, so he did not have to seek external processing. . More and more printers are now turning to the use of group ink technology, which can significantly increase the value of printed products and increase profits.
Whether the combination of ink technology can become a sustainable development of the technical combination of ink technology is the inadequacy of the traditional offset printing
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