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First, the technical indicators of ink in India, including the conventional inspection indicators and type inspection items, the conventional detection indicators include the color tinting strength, fineness and viscosity of the four: and the type of test items are initial, adhesion, residual solvent, surface tension Scratch resistance and rub resistance. In addition, according to the characteristics of different products and the requirements of users, the performance indicators are tested, such as the storage stability, transferability, diluting resistance, composite strength, extrusion strength, and antistatic properties of the products, which are often necessary. And quite important.
The inspection of finished ink products is an important means for quality control of mass production, while the periodic inspection items (type inspections) are mainly for observing the cycle stability of the products and providing important basis for certain improvements of the products. At the same time, they are also products. Upgrading, new production: The R&D of products provides an important basis.
Now on the impact of the technical indicators of printing ink type inspection items on printability and printing effects, and how to give them control, make some brief analysis:
Technical parameters for type inspection of printing ink
Technical Specifications Standard Initial Dry (mm/30S) 20~50
Adhesion (%) ≥85
Solvent residue (mg/m2) ≤25
Surface tension (d/cm) ≥38
Second, the meaning of type printing ink inspection
The ink manufacturer verified whether its ink quality and performance were still in a stable state after the product was produced for a period of time, or it had deviated from the standard level at the initial stage, and the product quality was reduced, causing the customer to have difficulty and trouble in printing. Implicit may bring economic losses to the company.
If the ink manufacturer blindly believes in his product, he always thinks that there is no problem in the residual solvent of his own product. Therefore, he can not perform this item inspection for a long time. The result may be subject to customer's complaint at any time, and the residual solvent. The amount has exceeded the standard. Ink production companies have investigated that although ink formulations, processes, production processes, and raw materials used have not changed, human factors such as process control cannot be exactly the same as those at the initial stage, and there have been some deviations. On the other hand, user use conditions are also changing. Therefore, the amount of residual solvent in the final product will also change.
Third, the relationship between type inspection items and printing and control.
The transfer of the gravure ink to the printed substrate 12 is actually a wetting and leveling process. The flow properties are in accordance with Newtonian principles of hydrodynamics. The tension between the substrate and the ink must be matched, otherwise the ink cannot be well leveled. If the surface tension of the ink is large, it will not be evenly leveled on the substrate. If the surface tension of the ink is low, the ink will flow on the substrate, causing the printed product to become a flower. When the surface tension of the substrate is insufficiently treated, The adhesion of the ink to the substrate will drastically decrease. In addition, when color registration is performed, if the surface tensions of the two inks do not match, the ink does not go up. The overprinting effect is poor and the hue is distorted. For example, the pattern of raw beef looks like cooked beef. of.
There are many factors that affect the tension of the ink sheet, but it is mainly the composition of the ink's formulation system. Therefore, when designing the ink formulation, we need to give full consideration to the technical requirements of the tension and tension of the ink, otherwise it will cause the ink itself. Quality defects give the user some difficulties in printing. Therefore, it is necessary to fully consider from the resin, pigment, filler, auxiliaries, because there is a big difference between the ink and surface printing ink, we want to avoid the higher the gloss of ink, the better a misunderstanding, the better the gloss The more dense the ink and resin on the surface of the ink film is, the lower the surface is. When the color is stacked, the tension of the ink after the color is large, so it is not easy to stack up. Therefore, the surface of the ink film is increased by adding some filler material. Roughness, increase the specific surface area, reduce the gloss, so that it meets the requirements of superposition. Therefore, we need to control the surface tension of the ink in an appropriate range. The wet ink should be as low as possible. After printing and drying, the surface tension should be as high as possible to achieve the best balance of printing effects.
The incipient dry index of gravure ink is an important index to measure the drying speed of ink. In the printing process, the speed of drying directly affects the quality of printed products. If the drying speed is too fast, it is easy to cause blockage and dry printing first. Because the ink quickly dries on the surface of the printing plate, the surface of the ink in the ink tank is likely to form a film, which affects the transfer of ink, causing blockage and missed printing. Particularly, some inks in the shallow printing plate quickly dry so that they cannot be transferred. Some of the bad transfer in the deep version. Second, it is easy to lose points on printed products. Due to the rapid drying of the ink, the ink is too late to transfer to the substrate and the dots cannot be completely reproduced. Ink drying is too fast, and it can easily lead to whitening of printed products. The solvent volatilization will take away heat during the drying process of the printed product. Due to the sharp drop in local temperature, the moisture in the air will condense on the surface of the printed product. Albino. At this time, we can adjust the volatilization rate of the solvent in the ink system, add some solvents with slower volatilization, such as xylene, and sometimes add some solvents with higher boiling points, but the high-boiling solvents should not be used too much. In order to prevent the drying process from being too slow, causing the printing product to adhere and cause the solvent residual value to exceed the standard. At the same time, the printing environment, the ability of the drying system, and the printing speed must be considered.
Drying speed is slow, the ink is transferred to the substrate, after the drying path has not dried, it will cause the guide roller to be dirty, in the process of the next color will stick the ink to the guide roller, when the ink is overprinted, it will be The ink of the latter color dissolves and pulls down, causing the ink in the ink groove of the color ink to change color and cannot be normally printed. The drying of the front color ink is slow, and the ink layer before rewinding may not completely dry out, resulting in anti-sticking of the printed product, and at the same time, the solvent may volatilize out<, resulting in high residue and odor and other problems. At this time, we can consider adding some of the more volatile solvents such as ethyl acetate and butanone to the ink to adjust the drying speed of the ink system so that it can achieve better printing results. The user can correctly use according to his own printing conditions and the correct use method and precautions provided by the ink factory to control the drying speed and achieve good results.
Adhesion fastness is crucial in the technical specifications of printing inks in gravure. Many of the packaging quality requirements are achieved by attachment fastness. If the ink has a low attachment fastness to its printing substrate, it will cause a series of post-processing problems, such as a decrease in the composite strength, a decrease in the heat-sealing strength, and the contents of the packaging bag are easily damaged during transportation. We have done such an experiment, when the fastness of the ink is reduced to 70% of the original, it is compounded and matured after proofing, its composite strength is measured, and its heat seal strength is reduced by 50% compared with the original, and it is not up to the technical standards. At the same time, the adhesion is not enough, it will also bring difficulties to the production of anti-sticky printing, when overprinting, the front color adhesion will not be enough to pull down the next color. Some post-printing processes can reduce the adhesion. The adhesion of the ink itself is relatively low and it is even lower when the bag is made. The fastness of the ink is mainly provided by the binder in the ink system, and the binders corresponding to different printing substrates are not the same, sometimes very different. Therefore, when designing a formula, it is necessary to consider what kind of resin is used to make the ink. Sometimes, when the main resin does not reach the adhesion fastness, some functional resins, additives and adhesion promoters can be selected. The meter helps the ink to improve the adhesion on the printed substrate. When selecting these functional resins and auxiliaries, certain tests must be done, because some functional resins and auxiliaries may also have other negative effects when they are used to improve their attachment fastness properties. In the process of developing extruded inks, we may also have negative effects in other aspects in order to improve the adhesion fastness performance. During the development of extrusion inks, we chose an adhesion promoter in order to improve its adhesion on the BOPP film. As a result, the adhesion fastness on the BOPP film was greatly enhanced, and the adhesion fastness was improved. Without enhancement, it will decrease. This shows that functional resins and auxiliaries have their own advantages as well as their drawbacks. When we use this kind of material, we must be cautious, otherwise it will lead to serious consequences.
The indicator of the residual quantity is a very important control index in the ink, especially the ink used for the packaging of food and medicine, and its solvent residue content control requirement is very high. If the residue is high, it will directly endanger people's health. Therefore, in the manufacture of this type of ink product, it is necessary to strengthen the control of the residual amount. If the indicator does not meet the requirements of the standard, it will cause huge economic losses once it is complained. When used in other packaging applications, high residual amounts can cause prints to become sticky; overprinting results in poor residual dryness due to pre-color residue, and is easy to pull on ink; composite aluminum film rearranges due to the peal ratio. It will also produce complex white spots; high residues may also cause offensive odors, so it is necessary to fully consider this problem when designing formulas. To select good solvent-releasing resins as the connecting material, the resin itself cannot contain odors, and it can be used at the same time. Reasonable solvent ratio, adding some appropriate filler or auxiliary ingredients to help the smooth release of solvent, in order to achieve the purpose of reducing the residual solvent.
Fourth, ink is a fine chemical product, to be a good quality ink, in addition to control some of the daily general indicators, but also on a regular basis to test the type of project. With the rapid development of science and technology, packaging and printing equipment is also changing with each passing day. The speed of presses is getting faster and faster, and the conditions are constantly improving. Therefore, the performance of the printing ink should also change. According to the original ideological understanding, merely controlling some of the above performance indicators within the scope of the standard is far from enough. While performing the above-mentioned performance tests, there are still many properties to be considered in post-processing, such as the weather resistance of the ink. Some inks print well in the dry season, once in the rainy season; there are antistatic properties, storage stability, etc. of the ink, and more important are some printing problems, such as fog, through the ink The test cannot be verified and is only reflected after use. The future task of some ink workers is still very arduous. How to respond to some of the printing problems in the test index of the ink, that is, we can certainly determine whether a certain performance of the ink in its post-press processing meets the requirements by detecting an index of the ink. Enhancing the quality of ink is undoubtedly a breakthrough.
Source: Packaging Printing Network
The inspection of finished ink products is an important means for quality control of mass production, while the periodic inspection items (type inspections) are mainly for observing the cycle stability of the products and providing important basis for certain improvements of the products. At the same time, they are also products. Upgrading, new production: The R&D of products provides an important basis.
Now on the impact of the technical indicators of printing ink type inspection items on printability and printing effects, and how to give them control, make some brief analysis:
Technical parameters for type inspection of printing ink
Technical Specifications Standard Initial Dry (mm/30S) 20~50
Adhesion (%) ≥85
Solvent residue (mg/m2) ≤25
Surface tension (d/cm) ≥38
Second, the meaning of type printing ink inspection
The ink manufacturer verified whether its ink quality and performance were still in a stable state after the product was produced for a period of time, or it had deviated from the standard level at the initial stage, and the product quality was reduced, causing the customer to have difficulty and trouble in printing. Implicit may bring economic losses to the company.
If the ink manufacturer blindly believes in his product, he always thinks that there is no problem in the residual solvent of his own product. Therefore, he can not perform this item inspection for a long time. The result may be subject to customer's complaint at any time, and the residual solvent. The amount has exceeded the standard. Ink production companies have investigated that although ink formulations, processes, production processes, and raw materials used have not changed, human factors such as process control cannot be exactly the same as those at the initial stage, and there have been some deviations. On the other hand, user use conditions are also changing. Therefore, the amount of residual solvent in the final product will also change.
Third, the relationship between type inspection items and printing and control.
The transfer of the gravure ink to the printed substrate 12 is actually a wetting and leveling process. The flow properties are in accordance with Newtonian principles of hydrodynamics. The tension between the substrate and the ink must be matched, otherwise the ink cannot be well leveled. If the surface tension of the ink is large, it will not be evenly leveled on the substrate. If the surface tension of the ink is low, the ink will flow on the substrate, causing the printed product to become a flower. When the surface tension of the substrate is insufficiently treated, The adhesion of the ink to the substrate will drastically decrease. In addition, when color registration is performed, if the surface tensions of the two inks do not match, the ink does not go up. The overprinting effect is poor and the hue is distorted. For example, the pattern of raw beef looks like cooked beef. of.
There are many factors that affect the tension of the ink sheet, but it is mainly the composition of the ink's formulation system. Therefore, when designing the ink formulation, we need to give full consideration to the technical requirements of the tension and tension of the ink, otherwise it will cause the ink itself. Quality defects give the user some difficulties in printing. Therefore, it is necessary to fully consider from the resin, pigment, filler, auxiliaries, because there is a big difference between the ink and surface printing ink, we want to avoid the higher the gloss of ink, the better a misunderstanding, the better the gloss The more dense the ink and resin on the surface of the ink film is, the lower the surface is. When the color is stacked, the tension of the ink after the color is large, so it is not easy to stack up. Therefore, the surface of the ink film is increased by adding some filler material. Roughness, increase the specific surface area, reduce the gloss, so that it meets the requirements of superposition. Therefore, we need to control the surface tension of the ink in an appropriate range. The wet ink should be as low as possible. After printing and drying, the surface tension should be as high as possible to achieve the best balance of printing effects.
The incipient dry index of gravure ink is an important index to measure the drying speed of ink. In the printing process, the speed of drying directly affects the quality of printed products. If the drying speed is too fast, it is easy to cause blockage and dry printing first. Because the ink quickly dries on the surface of the printing plate, the surface of the ink in the ink tank is likely to form a film, which affects the transfer of ink, causing blockage and missed printing. Particularly, some inks in the shallow printing plate quickly dry so that they cannot be transferred. Some of the bad transfer in the deep version. Second, it is easy to lose points on printed products. Due to the rapid drying of the ink, the ink is too late to transfer to the substrate and the dots cannot be completely reproduced. Ink drying is too fast, and it can easily lead to whitening of printed products. The solvent volatilization will take away heat during the drying process of the printed product. Due to the sharp drop in local temperature, the moisture in the air will condense on the surface of the printed product. Albino. At this time, we can adjust the volatilization rate of the solvent in the ink system, add some solvents with slower volatilization, such as xylene, and sometimes add some solvents with higher boiling points, but the high-boiling solvents should not be used too much. In order to prevent the drying process from being too slow, causing the printing product to adhere and cause the solvent residual value to exceed the standard. At the same time, the printing environment, the ability of the drying system, and the printing speed must be considered.
Drying speed is slow, the ink is transferred to the substrate, after the drying path has not dried, it will cause the guide roller to be dirty, in the process of the next color will stick the ink to the guide roller, when the ink is overprinted, it will be The ink of the latter color dissolves and pulls down, causing the ink in the ink groove of the color ink to change color and cannot be normally printed. The drying of the front color ink is slow, and the ink layer before rewinding may not completely dry out, resulting in anti-sticking of the printed product, and at the same time, the solvent may volatilize out<, resulting in high residue and odor and other problems. At this time, we can consider adding some of the more volatile solvents such as ethyl acetate and butanone to the ink to adjust the drying speed of the ink system so that it can achieve better printing results. The user can correctly use according to his own printing conditions and the correct use method and precautions provided by the ink factory to control the drying speed and achieve good results.
Adhesion fastness is crucial in the technical specifications of printing inks in gravure. Many of the packaging quality requirements are achieved by attachment fastness. If the ink has a low attachment fastness to its printing substrate, it will cause a series of post-processing problems, such as a decrease in the composite strength, a decrease in the heat-sealing strength, and the contents of the packaging bag are easily damaged during transportation. We have done such an experiment, when the fastness of the ink is reduced to 70% of the original, it is compounded and matured after proofing, its composite strength is measured, and its heat seal strength is reduced by 50% compared with the original, and it is not up to the technical standards. At the same time, the adhesion is not enough, it will also bring difficulties to the production of anti-sticky printing, when overprinting, the front color adhesion will not be enough to pull down the next color. Some post-printing processes can reduce the adhesion. The adhesion of the ink itself is relatively low and it is even lower when the bag is made. The fastness of the ink is mainly provided by the binder in the ink system, and the binders corresponding to different printing substrates are not the same, sometimes very different. Therefore, when designing a formula, it is necessary to consider what kind of resin is used to make the ink. Sometimes, when the main resin does not reach the adhesion fastness, some functional resins, additives and adhesion promoters can be selected. The meter helps the ink to improve the adhesion on the printed substrate. When selecting these functional resins and auxiliaries, certain tests must be done, because some functional resins and auxiliaries may also have other negative effects when they are used to improve their attachment fastness properties. In the process of developing extruded inks, we may also have negative effects in other aspects in order to improve the adhesion fastness performance. During the development of extrusion inks, we chose an adhesion promoter in order to improve its adhesion on the BOPP film. As a result, the adhesion fastness on the BOPP film was greatly enhanced, and the adhesion fastness was improved. Without enhancement, it will decrease. This shows that functional resins and auxiliaries have their own advantages as well as their drawbacks. When we use this kind of material, we must be cautious, otherwise it will lead to serious consequences.
The indicator of the residual quantity is a very important control index in the ink, especially the ink used for the packaging of food and medicine, and its solvent residue content control requirement is very high. If the residue is high, it will directly endanger people's health. Therefore, in the manufacture of this type of ink product, it is necessary to strengthen the control of the residual amount. If the indicator does not meet the requirements of the standard, it will cause huge economic losses once it is complained. When used in other packaging applications, high residual amounts can cause prints to become sticky; overprinting results in poor residual dryness due to pre-color residue, and is easy to pull on ink; composite aluminum film rearranges due to the peal ratio. It will also produce complex white spots; high residues may also cause offensive odors, so it is necessary to fully consider this problem when designing formulas. To select good solvent-releasing resins as the connecting material, the resin itself cannot contain odors, and it can be used at the same time. Reasonable solvent ratio, adding some appropriate filler or auxiliary ingredients to help the smooth release of solvent, in order to achieve the purpose of reducing the residual solvent.
Fourth, ink is a fine chemical product, to be a good quality ink, in addition to control some of the daily general indicators, but also on a regular basis to test the type of project. With the rapid development of science and technology, packaging and printing equipment is also changing with each passing day. The speed of presses is getting faster and faster, and the conditions are constantly improving. Therefore, the performance of the printing ink should also change. According to the original ideological understanding, merely controlling some of the above performance indicators within the scope of the standard is far from enough. While performing the above-mentioned performance tests, there are still many properties to be considered in post-processing, such as the weather resistance of the ink. Some inks print well in the dry season, once in the rainy season; there are antistatic properties, storage stability, etc. of the ink, and more important are some printing problems, such as fog, through the ink The test cannot be verified and is only reflected after use. The future task of some ink workers is still very arduous. How to respond to some of the printing problems in the test index of the ink, that is, we can certainly determine whether a certain performance of the ink in its post-press processing meets the requirements by detecting an index of the ink. Enhancing the quality of ink is undoubtedly a breakthrough.
Source: Packaging Printing Network
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