Many plastic color printing factories sometimes need to replace ink manufacturers because of ink quality problems, cost, stability, etc., but they are more cautious about such problems, fearing that the replacement of ink will affect production, resulting in reciprocating fluctuations in product quality. Cause economic losses. The ink properties of different manufacturers will be different and will have different effects on printing.
The inks currently used in the plastic color printing industry are classified into many types, and are classified into surface printing inks and printing inks according to the printing position. The printing ink is divided into polyester nylon ink, OPP special ink and aluminum foil special ink according to different printing materials; it is divided into ordinary ink, boiled ink and cooking ink according to different use temperatures.
Many plastic color printing factories sometimes need to replace ink manufacturers because of ink quality problems, cost, stability, etc., but they are more cautious about such problems, fearing that the replacement of ink will affect production, resulting in reciprocating fluctuations in product quality. Cause economic losses. The ink properties of different manufacturers will be different and will have different effects on printing.
Frequently asked questions in replacing inks
1. Hue of ink: The ink is divided into primary ink and spot ink. The primary color inks produced by the ink manufacturer are the same, respectively, the original red, the original yellow, the original blue, black, white, etc.; the spot color ink has ultramarine, red, light yellow, etc., and the ink manufacturer will also adjust according to the special requirements of customers. Some spot color inks (generally for prints with large print volumes and special patterns).
2. Viscosity of ink: The viscosity of ink produced by different ink manufacturers will be slightly different. The color printing factory will dilute the ink with mixed solvent, so that the viscosity of ink printing is generally controlled between 16 and 26 seconds (No. 3) . Because of the different color of the printing color sequence and the ink itself, the viscosity required for each ink will be different. Generally, the viscosity of white ink is the lowest, about 17 seconds; the viscosity of black ink is the highest, about 25 seconds, other colors. The ink is between the two.
3. Ink fineness: The ink of the same type is generally the same between different ink manufacturers, but the difference in ink between different ink manufacturers is that the normal distribution of the particles of the ink is different, of course, there are other aspects. The differences are as follows: the ink produced by the A factory and the ink produced by the B factory, the particle size is between 20 and 28 microns, but the ink particle size distribution produced by the A factory is relatively concentrated at about 24 microns, while the B factory ink The distribution is relatively scattered between 20 and 28 microns, so the ink printing performance of the A factory is better than that of the B factory (as shown in Figure A).
4. In addition to the performance of these inks, it should be noted that for the plastic color printing industry, there is also a performance requirement that the release of residual organic solvents in the ink, because the products from the color printing factory are generally in direct contact with the food, although the ink Glue and other substances are not directly in contact with food, but some of the small molecules will migrate to the surface of the film, affecting the hygiene of the food. Therefore, there are corresponding national standards for the residual solvent countries, and the color printing factory should also purchase the corresponding testing equipment. However, the current situation is that most small factories do not have such equipment. In addition, many domestic color printing factories with complete testing equipment are not strictly controlled on this indicator, resulting in unsatisfactory product hygiene indicators.
5. The production process is also a factor to be considered, but at present the process level of each color printing factory is basically mature, the difference is not big, but the special need to pay attention to the difference of the speed of the printing machine, the printing speed between different color printing factories is about 80~250 meters. /min, if the color printing factory wants to change the ink, it is necessary to consider the viscosity characteristics of the ink, especially the ultra-high speed printing (200 m/min or more), the ink viscosity is very low, the color density should be up to standard, and the ink factory has high requirements. .
Hue problems often encountered by ink color printing manufacturers
1. There is a color difference between the same color ink produced by different ink manufacturers (as shown in Figure B). From the figure, we can see that there is a certain difference in the hue between the inks of A and B, and there is no difference in the printed pattern. In the case of color ink overlay, the chromatic aberration may not feel much, but if there is a superimposed part, the difference may be obvious. This requires the ink factory to make appropriate adjustments to the ink formulation to minimize this difference. Increasing costs for color printing plants, so this should be taken into account when replacing ink manufacturers.
2. General products will produce a superposition of inks of different colors due to the screening, and slight differences in hue will occur if the conditions are not changed and the process conditions are unchanged. At the same time, due to the characteristics of color printing, most of the printing colors are more than 5 colors, and more than a dozen colors, in addition to the original color ink, there are also special color inks, in addition to other special printing materials, such as varnish according to special process requirements. Wait. Therefore, the application of spot color ink in color printing factory is also very common. The spot color ink is generally adjusted by the color printing factory technicians. Under the condition that the printing plate and other process conditions are unchanged, the ink after replacement can generally be used. Close to the original color proofing of the ink proofing, but if the printing pattern is complicated and the process is special, the color sample requirement will not be met in many cases. If this is the case, the ink factory should adjust the ink formulation or modify the version. If it is the latter, then This will increase the cost to the color printing factory, so this should be taken into account when replacing the ink manufacturer.
The general process of replacing ink (from A factory ink to B factory ink)
(1) Firstly, the color samples of the primary color ink and the spot color ink of the ink of the factory A of the B factory are provided. If it is a printed matter, it is required to be superimposed, preferably a solid color block.
(2) There are many sets of color printing factories. First, one or several sets of plates are provided to the ink factory, and the B factory is required to proof. Generally, the choices provided to the B factory are generally selected from the original color ink blocks and the commonly used spot color inks.
(3) Entering the experimental stage, the ink plant technicians (proficient in the printing process and the performance of the ink) are generally commissioned on site.
(4) In this process, mainly the primary color inks, the common spot color inks basically meet the ink hue requirements of the A factory, then the color printing factory can basically be replaced with the ink of the B factory.
(5) But this does not mean that the color printing factory can sit back and relax. The color printing factory generally has a version with higher difficulty requirements (special color ink), and the ink factory generally has the production of spot color ink, so the difficulty lies in the production of such products. The printing sample and the standard sample produce a color difference. In the case where the primary color inks are substantially identical, the color difference is generally caused by the spot color ink. The specific analysis is as follows:
a. In the printed pattern, when the spot color ink has no screen or no color, the spot color ink has a color difference, and the ink formula is re-adjusted by the ink factory. If the spot color ink is formulated by the ink factory, one of the spot color inks is usually formulated by the ink factory (the spot color ink is prepared by several inks).
b. In the case that the printed pattern has a screening, at the same time there is a superposition of different hue inks, the analysis should be caused by the primary color ink or the spot color ink, which should be adjusted according to E1. If it is caused by the original color ink, the ink factory should be required to adjust the original color ink formula. If it is caused by the spot color ink, it should be adjusted according to E1.
c. There is a more special and complicated situation, that is, there are multiple color layers superimposed in the pattern of one product, that is, there are several patterns of overlapping holes in the same plate. If the first proof is used, the proof result is inconsistent with the standard. Where the printed samples are consistent and the other parts are inconsistent, then it is necessary to pay attention to the analysis:
1, the original color inks have different hue between different ink manufacturers.
2, there is a difference in the shade of color between the same color ink (sometimes can be solved by revision).
The above briefly discusses the problems that color printing manufacturers often encounter when replacing inks. I hope that the relevant manufacturers will be helpful. I hope to discuss them with you.
Many plastic color printing factories sometimes need to replace ink manufacturers because of ink quality problems, cost, stability, etc., but they are more cautious about such problems, fearing that the replacement of ink will affect production, resulting in reciprocating fluctuations in product quality. Cause economic losses. The ink properties of different manufacturers will be different and will have different effects on printing.
The inks currently used in the plastic color printing industry are classified into many types, and are classified into surface printing inks and printing inks according to the printing position. The printing ink is divided into polyester nylon ink, OPP special ink and aluminum foil special ink according to different printing materials; it is divided into ordinary ink, boiled ink and cooking ink according to different use temperatures.
Many plastic color printing factories sometimes need to replace ink manufacturers because of ink quality problems, cost, stability, etc., but they are more cautious about such problems, fearing that the replacement of ink will affect production, resulting in reciprocating fluctuations in product quality. Cause economic losses. The ink properties of different manufacturers will be different and will have different effects on printing.
Frequently asked questions in replacing inks
1. Hue of ink: The ink is divided into primary ink and spot ink. The primary color inks produced by the ink manufacturer are the same, respectively, the original red, the original yellow, the original blue, black, white, etc.; the spot color ink has ultramarine, red, light yellow, etc., and the ink manufacturer will also adjust according to the special requirements of customers. Some spot color inks (generally for prints with large print volumes and special patterns).
2. Viscosity of ink: The viscosity of ink produced by different ink manufacturers will be slightly different. The color printing factory will dilute the ink with mixed solvent, so that the viscosity of ink printing is generally controlled between 16 and 26 seconds (No. 3) . Because of the different color of the printing color sequence and the ink itself, the viscosity required for each ink will be different. Generally, the viscosity of white ink is the lowest, about 17 seconds; the viscosity of black ink is the highest, about 25 seconds, other colors. The ink is between the two.
3. Ink fineness: The ink of the same type is generally the same between different ink manufacturers, but the difference in ink between different ink manufacturers is that the normal distribution of the particles of the ink is different, of course, there are other aspects. The differences are as follows: the ink produced by the A factory and the ink produced by the B factory, the particle size is between 20 and 28 microns, but the ink particle size distribution produced by the A factory is relatively concentrated at about 24 microns, while the B factory ink The distribution is relatively scattered between 20 and 28 microns, so the ink printing performance of the A factory is better than that of the B factory (as shown in Figure A).
4. In addition to the performance of these inks, it should be noted that for the plastic color printing industry, there is also a performance requirement that the release of residual organic solvents in the ink, because the products from the color printing factory are generally in direct contact with the food, although the ink Glue and other substances are not directly in contact with food, but some of the small molecules will migrate to the surface of the film, affecting the hygiene of the food. Therefore, there are corresponding national standards for the residual solvent countries, and the color printing factory should also purchase the corresponding testing equipment. However, the current situation is that most small factories do not have such equipment. In addition, many domestic color printing factories with complete testing equipment are not strictly controlled on this indicator, resulting in unsatisfactory product hygiene indicators.
5. The production process is also a factor to be considered, but at present the process level of each color printing factory is basically mature, the difference is not big, but the special need to pay attention to the difference of the speed of the printing machine, the printing speed between different color printing factories is about 80~250 meters. /min, if the color printing factory wants to change the ink, it is necessary to consider the viscosity characteristics of the ink, especially the ultra-high speed printing (200 m/min or more), the ink viscosity is very low, the color density should be up to standard, and the ink factory has high requirements. .
Hue problems often encountered by ink color printing manufacturers
1. There is a color difference between the same color ink produced by different ink manufacturers (as shown in Figure B). From the figure, we can see that there is a certain difference in the hue between the inks of A and B, and there is no difference in the printed pattern. In the case of color ink overlay, the chromatic aberration may not feel much, but if there is a superimposed part, the difference may be obvious. This requires the ink factory to make appropriate adjustments to the ink formulation to minimize this difference. Increasing costs for color printing plants, so this should be taken into account when replacing ink manufacturers.
2. General products will produce a superposition of inks of different colors due to the screening, and slight differences in hue will occur if the conditions are not changed and the process conditions are unchanged. At the same time, due to the characteristics of color printing, most of the printing colors are more than 5 colors, and more than a dozen colors, in addition to the original color ink, there are also special color inks, in addition to other special printing materials, such as varnish according to special process requirements. Wait. Therefore, the application of spot color ink in color printing factory is also very common. The spot color ink is generally adjusted by the color printing factory technicians. Under the condition that the printing plate and other process conditions are unchanged, the ink after replacement can generally be used. Close to the original color proofing of the ink proofing, but if the printing pattern is complicated and the process is special, the color sample requirement will not be met in many cases. If this is the case, the ink factory should adjust the ink formulation or modify the version. If it is the latter, then This will increase the cost to the color printing factory, so this should be taken into account when replacing the ink manufacturer.
The general process of replacing ink (from A factory ink to B factory ink)
(1) Firstly, the color samples of the primary color ink and the spot color ink of the ink of the factory A of the B factory are provided. If it is a printed matter, it is required to be superimposed, preferably a solid color block.
(2) There are many sets of color printing factories. First, one or several sets of plates are provided to the ink factory, and the B factory is required to proof. Generally, the choices provided to the B factory are generally selected from the original color ink blocks and the commonly used spot color inks.
(3) Entering the experimental stage, the ink plant technicians (proficient in the printing process and the performance of the ink) are generally commissioned on site.
(4) In this process, mainly the primary color inks, the common spot color inks basically meet the ink hue requirements of the A factory, then the color printing factory can basically be replaced with the ink of the B factory.
(5) But this does not mean that the color printing factory can sit back and relax. The color printing factory generally has a version with higher difficulty requirements (special color ink), and the ink factory generally has the production of spot color ink, so the difficulty lies in the production of such products. The printing sample and the standard sample produce a color difference. In the case where the primary color inks are substantially identical, the color difference is generally caused by the spot color ink. The specific analysis is as follows:
a. In the printed pattern, when the spot color ink has no screen or no color, the spot color ink has a color difference, and the ink formula is re-adjusted by the ink factory. If the spot color ink is formulated by the ink factory, one of the spot color inks is usually formulated by the ink factory (the spot color ink is prepared by several inks).
b. In the case that the printed pattern has a screening, at the same time there is a superposition of different hue inks, the analysis should be caused by the primary color ink or the spot color ink, which should be adjusted according to E1. If it is caused by the original color ink, the ink factory should be required to adjust the original color ink formula. If it is caused by the spot color ink, it should be adjusted according to E1.
c. There is a more special and complicated situation, that is, there are multiple color layers superimposed in the pattern of one product, that is, there are several patterns of overlapping holes in the same plate. If the first proof is used, the proof result is inconsistent with the standard. Where the printed samples are consistent and the other parts are inconsistent, then it is necessary to pay attention to the analysis:
1, the original color inks have different hue between different ink manufacturers.
2, there is a difference in the shade of color between the same color ink (sometimes can be solved by revision).
The above briefly discusses the problems that color printing manufacturers often encounter when replacing inks. I hope that the relevant manufacturers will be helpful. I hope to discuss them with you.
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