In recent years, with the rapid development of China's printing industry, the ink manufacturing industry has also grown and expanded, especially the special varieties of ink market prospects. As one of the special inks, the prospect of pearlescent ink is widely expected by the industry. In the packaging of high-end cosmetics, high-end trademarks and promotional materials, pearl ink has strong competitiveness and development potential.
The printing effect of pearlescent ink is generally determined by the visual reflection of the pearlescent effect, brightness, and color effects. Different printing methods, the effect of the product is also very different. The commonly used printing pearl inks mainly include screen printing, gravure printing, offset printing, flexo pearl ink, etc. Among them, the offset printing pearl ink has finer pearlescent luster and stronger light refractive index, which can greatly improve the grade of prints. The product packaging produced by it is not only beautiful, but also has a certain anti-counterfeiting effect, and is favored by the majority of businesses and consumers.
All packaging materials and labels can be printed with pearlescent pigment offset printing inks. Offset pearlescent inks are relatively difficult to use compared to screen printing and flexographic technology. The viscosity is relatively high, and the pearlescent pigments are particles that are ground using shells. It is difficult to use them. Dissolved in it, resulting in difficult to mix pearlescent pigments and offset inks, even if mixed together, the distribution of pearlescent pigments is not uniform. This means great challenges for offset printing. In the application process of offset printing pearl ink, it is necessary not only to properly mix and properly select and carefully handle the ink, but also to select the appropriate printing equipment according to the characteristics of the pearlescent pigment and apply advanced technology in printing in order to achieve the best Pearl effect.
I. Brittleness and Thickness of Pearlescent Pigment The commonly used pearlescent pigments are generally composed of anatase or rutile titanium dioxide coated mica flakes. The sheet structure is very brittle and easily damaged. At the same time, offset pearlescent inks have very stringent requirements for pigment fineness, such as the fineness of mica titanium pearlescent pigments below 25 μm. If the pigment particles are too thick, the transferability of the pearlescent ink is poor, but if the pigment particles are too fine, the pearlescent effect is affected.
Second, the ink viscosity and fluidity Offset pearlescent ink pigment specificity, requires the ink than other ordinary ink, low viscosity, fluidity, printing to meet the floating requirements of pearlescent pigments, so as to achieve the ideal pearl effect .
Third, the transparency of the ink The pearlescent effect of pearlescent ink depends on the refraction and interference of the incident light, so the transparency of the offset pearlescent ink has a great influence on the pearlescent effect. If the transparency of the ink layer is poor, the original sufficient light will be absorbed and affect the pearlescent effect.
Offset pearl ink printing use matters needing attention 1, the selection or processing of substrates. The surface of the substrate should be as smooth and flat as possible so that the alignment of the pigments is better. Because the ink layer in the offset printing is relatively thin, this is extremely important for achieving the desired pearlescent effect.
2. Large pigment particles can easily block the screen plate. If any plugging or blistering is found, it should be shut down immediately and thoroughly cleaned with alcohol.
3. Pay attention to the control of drying speed The printing ink layer of offset pearlescent ink is relatively thick. The drying speed of ink is slower than ordinary offset printing ink. At this time, the method of adding desiccant cannot be used to adjust, but it needs to control the temperature and humidity of paper and printing environment. . The ambient temperature should be controlled at 25±3°C, and the relative humidity should be controlled at about 55%. It must not be accelerated and the heated high temperature should be drastically dry.
4, try not to use halftone printing pearlescent pigments need to be arranged in order to make prints to achieve a satisfactory pearl effect. Mesh printing is not conducive to the orderly arrangement of pigments. Pearlescent inks are relatively suitable for the printing of solid patches.
5, pay attention to the amount of ink control pearlescent pigment particles can also lead to a larger amount of ink, particles are too thick, pearlescent pigments will leave residues in the ink, more difficult to separate, will lead to waste of ink. When using pearlescent ink, be sure to use it within the shelf life, and be sure to mix evenly when using it.
6, pay attention to the ink balance Because the offset printing pearl ink is relatively soft, easy to emulsify in the printing process, so in the case of not dirty version, the water supply to control to a minimum, the pH of the fountain solution is adjusted to about 5 more appropriate.
7, control the odor of printed products. Some products (such as cigarette packs) have stricter odor requirements for packaging. Although the odor of the pearlescent pigment itself is not large, if the pearlescent ink is not adjusted well, the odor generated by the product is likely to be large. By improving the ink and printing equipment, this problem can be effectively avoided.
In addition, when the printed matter is not stacked, it should not be heavily pressed. After drying, it should not overlap as much as possible to avoid the pearlescent pigment particles being crushed and affecting the pearlescent effect. In order to improve the surface wear resistance, temperature resistance, gas barrier and maintain its gloss, the surface can be coated with varnish or protective film.
Some of the problems that arise in printing are: 1ã€Appropriate dusting of printed sticky dirt, and control of proper stacking height; 3ã€Improving the speed of the printing press and reducing the dry time; 2) Decreasing the distance between the cutter and the pressure roller.
2. Poor pearl effect or no pearl effect Check whether the outlet of the printing plate is clogged or you need to clean the outlet. The outlets of the plate are too shallow to reach the desired effect. Check whether the viscosity of the pearl ink matches with the vehicle speed. Check whether the angle of the blade is too large or the pressure is too high. Check the distance between the blade and the pressure roller. phenomenon.
3, there is a pearl effect but the matt diluent volatilization speed is too fast, should be used with slow-drying thinner, reduce the oven temperature, or cold wind. At the same time, speed up the printing speed, increase the viscosity of the ink.
4. After the compounded product is printed, the strength of the peeling force is properly selected and the use of the pearlescent ink is determined, and the surface printing or the internal printing is determined. Choose a suitable glue and thinner. Control the compounding amount, temperature, tension, etc. Grasp the corona treatment of the film. For example, self-made pearlescent ink should be selected with suitable diluting agent and composite glue.
Offset pearlescent inks require higher printing technology. The slight carelessness in every link in the printing process may affect the pearlescent effect. In addition, the pigment particles in the ink itself are relatively thick, and the offset printing time must be matched with advanced printing techniques to achieve the desired results. Effect.
The printing effect of pearlescent ink is generally determined by the visual reflection of the pearlescent effect, brightness, and color effects. Different printing methods, the effect of the product is also very different. The commonly used printing pearl inks mainly include screen printing, gravure printing, offset printing, flexo pearl ink, etc. Among them, the offset printing pearl ink has finer pearlescent luster and stronger light refractive index, which can greatly improve the grade of prints. The product packaging produced by it is not only beautiful, but also has a certain anti-counterfeiting effect, and is favored by the majority of businesses and consumers.
All packaging materials and labels can be printed with pearlescent pigment offset printing inks. Offset pearlescent inks are relatively difficult to use compared to screen printing and flexographic technology. The viscosity is relatively high, and the pearlescent pigments are particles that are ground using shells. It is difficult to use them. Dissolved in it, resulting in difficult to mix pearlescent pigments and offset inks, even if mixed together, the distribution of pearlescent pigments is not uniform. This means great challenges for offset printing. In the application process of offset printing pearl ink, it is necessary not only to properly mix and properly select and carefully handle the ink, but also to select the appropriate printing equipment according to the characteristics of the pearlescent pigment and apply advanced technology in printing in order to achieve the best Pearl effect.
I. Brittleness and Thickness of Pearlescent Pigment The commonly used pearlescent pigments are generally composed of anatase or rutile titanium dioxide coated mica flakes. The sheet structure is very brittle and easily damaged. At the same time, offset pearlescent inks have very stringent requirements for pigment fineness, such as the fineness of mica titanium pearlescent pigments below 25 μm. If the pigment particles are too thick, the transferability of the pearlescent ink is poor, but if the pigment particles are too fine, the pearlescent effect is affected.
Second, the ink viscosity and fluidity Offset pearlescent ink pigment specificity, requires the ink than other ordinary ink, low viscosity, fluidity, printing to meet the floating requirements of pearlescent pigments, so as to achieve the ideal pearl effect .
Third, the transparency of the ink The pearlescent effect of pearlescent ink depends on the refraction and interference of the incident light, so the transparency of the offset pearlescent ink has a great influence on the pearlescent effect. If the transparency of the ink layer is poor, the original sufficient light will be absorbed and affect the pearlescent effect.
Offset pearl ink printing use matters needing attention 1, the selection or processing of substrates. The surface of the substrate should be as smooth and flat as possible so that the alignment of the pigments is better. Because the ink layer in the offset printing is relatively thin, this is extremely important for achieving the desired pearlescent effect.
2. Large pigment particles can easily block the screen plate. If any plugging or blistering is found, it should be shut down immediately and thoroughly cleaned with alcohol.
3. Pay attention to the control of drying speed The printing ink layer of offset pearlescent ink is relatively thick. The drying speed of ink is slower than ordinary offset printing ink. At this time, the method of adding desiccant cannot be used to adjust, but it needs to control the temperature and humidity of paper and printing environment. . The ambient temperature should be controlled at 25±3°C, and the relative humidity should be controlled at about 55%. It must not be accelerated and the heated high temperature should be drastically dry.
4, try not to use halftone printing pearlescent pigments need to be arranged in order to make prints to achieve a satisfactory pearl effect. Mesh printing is not conducive to the orderly arrangement of pigments. Pearlescent inks are relatively suitable for the printing of solid patches.
5, pay attention to the amount of ink control pearlescent pigment particles can also lead to a larger amount of ink, particles are too thick, pearlescent pigments will leave residues in the ink, more difficult to separate, will lead to waste of ink. When using pearlescent ink, be sure to use it within the shelf life, and be sure to mix evenly when using it.
6, pay attention to the ink balance Because the offset printing pearl ink is relatively soft, easy to emulsify in the printing process, so in the case of not dirty version, the water supply to control to a minimum, the pH of the fountain solution is adjusted to about 5 more appropriate.
7, control the odor of printed products. Some products (such as cigarette packs) have stricter odor requirements for packaging. Although the odor of the pearlescent pigment itself is not large, if the pearlescent ink is not adjusted well, the odor generated by the product is likely to be large. By improving the ink and printing equipment, this problem can be effectively avoided.
In addition, when the printed matter is not stacked, it should not be heavily pressed. After drying, it should not overlap as much as possible to avoid the pearlescent pigment particles being crushed and affecting the pearlescent effect. In order to improve the surface wear resistance, temperature resistance, gas barrier and maintain its gloss, the surface can be coated with varnish or protective film.
Some of the problems that arise in printing are: 1ã€Appropriate dusting of printed sticky dirt, and control of proper stacking height; 3ã€Improving the speed of the printing press and reducing the dry time; 2) Decreasing the distance between the cutter and the pressure roller.
2. Poor pearl effect or no pearl effect Check whether the outlet of the printing plate is clogged or you need to clean the outlet. The outlets of the plate are too shallow to reach the desired effect. Check whether the viscosity of the pearl ink matches with the vehicle speed. Check whether the angle of the blade is too large or the pressure is too high. Check the distance between the blade and the pressure roller. phenomenon.
3, there is a pearl effect but the matt diluent volatilization speed is too fast, should be used with slow-drying thinner, reduce the oven temperature, or cold wind. At the same time, speed up the printing speed, increase the viscosity of the ink.
4. After the compounded product is printed, the strength of the peeling force is properly selected and the use of the pearlescent ink is determined, and the surface printing or the internal printing is determined. Choose a suitable glue and thinner. Control the compounding amount, temperature, tension, etc. Grasp the corona treatment of the film. For example, self-made pearlescent ink should be selected with suitable diluting agent and composite glue.
Offset pearlescent inks require higher printing technology. The slight carelessness in every link in the printing process may affect the pearlescent effect. In addition, the pigment particles in the ink itself are relatively thick, and the offset printing time must be matched with advanced printing techniques to achieve the desired results. Effect.
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