Carton Cartridge Water Ink Analysis

In China, the number of ink-and-wash applications for packaging and printing products is increasing every year. In particular, the use of screen stencils and flexo stencils is mostly used, but most of them use absorptive printing methods for absorptive media for paper substrates, especially for non-absorptive applications. The plastic, foil-type substrates for media have only recently been printed on webs by web machines. The progress of this technology shows that ink painting has gradually matured. At present, ink paintings have been recognized as "non-toxic inks" by the American Food and Drug Association.

The speed of development of ink and wash makes other inks difficult to predict. In the past, inks had poor gloss, poor water resistance, poor adhesion, difficulty in overprinting, discoloration and discoloration, and unpleasant clothes with uneven edges and edges. This is very advantageous for promoting the application of water-based inks in cartons and cartons. In addition, the ink has the characteristics of non-explosion, non-transportation, non-pollution and non-toxicity, and uses water to adjust the drilling degree and cleaning printing equipment, reducing the production cost and labor intensity, and reducing the safety risks for the production, transportation and use units. . The current use of ink is increasing. Despite its quality, there are still some deficiencies but the security has been unanimously approved by the packaging and printing industry.

For more than a decade, ink painting has combined the characteristics of various packaging and printing materials in the manufacture of experimental test prints and production applications, and has firmly grasped: 1 Film-forming substances in ink adhere pigment fillers to substrates. Ink is a standing, non-stick body; 2 can provide adequate leveling, spreadability, and gloss on the substrate; 3 Highly effective wetting agents and abrasion resistance: 4 Maintaining and improving pigment dispersion The role and printability; 5 can have enough print re-solubility, but after drying should have a certain degree of water resistance. Change the traditional ink using a simple water-soluble polymer compound (such as casein, shellac, polyvinyl alcohol resin, etc. as the ink connecting material), because it is not only resistant to water friction and not resistant to water. So now for rotary flexible convex Printing and gravure printing ink systems use water-based ink connecting materials such as acrylic and polynitrogen vinegar, which have been replaced by glycol ethers in the past (metabolites such as alkoxyacetic acid). Toxic 1,2-propylene glycol. Finally decomposes into carbon dioxide and water. The toxicity is low. There is also a non-initiator water-based uv ink that has entered the market for the preparation of non-toxic inks. Now the latter are mostly adopted.

Relationship between printing conditions and dry speed and gloss

1. Water-based inks for water-soluble flexographic and rotogravure webs for printed packaging paper bags, books and magazines, cartons, cartons, and cigarette packs. In the past decade or more, gravure paper inks made from high-polymer acrylics have been used. Although it is able to meet the printing requirements for high-grade products that require a higher quality of the print quality, it is still possible to satisfy the user's requirements for glossy and bright, or it is recommended to use water-based UV inks without initiators.

2. The temperature and humidity of the printing shop have a great influence on the drying speed and gloss of the printing ink film. Temperature is the main factor affecting the oxidative polymerization, volatilization, and firm ink film. Therefore, in summer and winter, the southern coastal area and the northern highland area have a difference of about 1 time in the gloss of ink dried and filmed. In the case of relative humidity of 95% and 65%, the drying time is almost twice as high, and the dry humidity and pH of the paper and paper box itself will directly affect the dry time of the printed products.

3. Acid can delay the oxidative polymerization of ink and the formation of volatile solid ink film. Excessive alkalinity will lead to internal wet and dry and affect the adhesion of ink on the surface of printed products.

4. Because oxygen or blow drying or baking is a factor that promotes oxidative polymerization and volatilization of the solid ink film, the degree of ventilation in the press room and the way in which prints are stacked are also related to the drying speed of the printed product.

Ink and ink troubleshooting reasons and troubleshooting

1. Hue is not allowed. The ink is too low or the pigment content in the ink system is small or the color purity is deviated. When the ink is printed, precipitation is precipitated and the transfer is poor. Incorporate the original ink. Adjust the degree of rheology and mix the ink before printing. Check if the printing plate and ink roller are aging.

2. The viscosity is unstable. The ink has thixotropy and foaming. The solvent is volatile. The ink should be stirred evenly and then added with a suitable defoamer (0.2%) to adjust the balance of volatilization.

3. Poor drying. In the expected time imprinted or even sticky. High ink rheology. Poor absorption of dry paper or plastic and fabric. Dilute the ink, adjust the printing pressure to increase the temperature of the air or drying channel, or use a quick-drying ink, or adjust the dryness. Replace the substrate by replacing the plate.

4. The outline is blurred. Printed high-profile part of the picture is fuzzy. Dots are missing and the tone is lost. The printing plate quality is not high. The printing plate and the ink roller are in tight contact. The ink has a large degree of drilling and the ink returns to the coarse ink and dries too quickly. The pad plate should be evenly leveled to adjust the printing pressure. To adjust the ink density, mix the alcohol and water with a reasonable amount of ink, and adjust the ventilation device. Do not blow onto the other roller, and increase the speed. Use a water bath containing monoethanolamine to scrub. Add 0.2% simethicone or increase the coupling agent ratio.

5. Graphic crush ink out of graphics. The quality of the printing plate is too soft or the pad plate is too elastic. Too much contact pressure. Too much ink is too personal. Poor mixing of the ink. The pad adjusts the printing plate to adjust the pressure of the printing plate or the pressure of the manual screen printing plate, and adjusts the drilling degree to change the ink of high drilling degree or exchanges the ink with higher hardness and mixes the ink reasonably.

6. Bad transfer. The printing pressure is too high. The hardness of the printing plate is too high. The water resistance of the paper is too strong and the ink roller wears out. Increase Indentation Use hydrophobic inks Check Ink Roller Wear Aging Add TM-20. Coupling agent. Replace worn metal anilox roller.

7 difficult to register. Multi-color register sets are not allowed. The first color ink printing pressure is too large The first color ink is too dry. Should increase the second color pressure, the first color pressure should be light. Add appropriate amount of TM-200 S coupling agent The first color ink should be reduced and adjusted the dryness of the first color ink or When the ink film is not dry, the second color is printed (overcoming the surface vitrification). The printing plate swells and protrudes out of shape. Replace the paper.

8. The ink foams, and the foam overflows after ink circulation in the printer ink fountain. Ink system Suppression agent poor Ink circulation t Not enough water t Too much pump circulation too much Tube leak Air ink too thin. Appropriate to add defoamer (0.2% is best to use both inside and outside the plastic defoamer mixed) to reduce the amount of pump circulation to add new ink to make it not excessive dilution check the pipe to prevent air leakage.

9. Chemical pinholes. Plus defoamer overdose. The ink dilutes the ink with excessively low private ink. Note that about 0.2% of antifoaming agent should be incorporated. It should be mixed with the original ink and then mixed again.

10. Plate wear. The contact is too tight and the print is too hard. Adjust the contact. Adjust the printing pressure. Replace the printing plate or add 3mm plastic foam sheet behind the plate.

11. Ink glue. With the wrong solvent (some active molecules start to associate to form colloidal size aggregates). Mixed with other types of ink, improper storage, the wrong colorant used in the ink, the ink aging. Add about 2% of the silica gel or 0.3% TM-200 coupling agent in a good solvent, and seal the mixture to add the active adjuvant.

12. Dirty paste/dyeing/dyeing during printing and stacking after printing. Friction on the transfer lever and film smearing. Degraded ink is too slow, printing speed is too fast, ventilation is not proper, ink is too hot, and ink is too soft. . Replace the harder ink and add a quick solvent (ethanol or acetone) to slow down the printing speed and increase the air volume.

13. Ink faded The color of ink fades during printing or stacking. Ink-washing system has over-absorbed pigments and pigments are used wrongly (acidic alkali-resistant). The carrier is over-acidic. The ink pigments are not heat-resistant. Use fast-drying ink or little driers for pigments. Use pigments that are heat- and light-resistant, and replace non-reactive calcium-based fillers. Add inorganic mica powder or anti-ultraviolet absorber or anti-oxidant 0.1% to 0.3%. .

14 streaked orange peel. Imprinting is not level. Insufficient leveling of ink and water, plasticizer over f, and thixotropy is too large, sometimes net stains, paper is not level, ink is too large. Ink pressure is too large ink is too thin, water is too large. Replacing thicker inks to reduce printing pressure for good ink resistance. Use opaque ink. Change the surface quality of the uniform substrate to increase the amount of filling (such as talcum powder can prevent Shen and improve leveling). Exchange less viscosity The ink. Do not dilute the light to reduce static electricity.

15. Imprinting (powdering). After printing, binding, moving or hand rubbing, the ink contaminates the prints and fingers. Due to improper adjustment of the ink, the resin in the ink system is reduced or the solubility of the solvent and solvent of the ink system is unbalanced, and the filler is poor in wettability, the surface of the paper is too rough, or the surface of the aluminum or plastic is too smooth. Increase the resin content to reduce the proportion of water as much as possible to balance the content and solubility.

16. Poor resistance. Water, light and abrasion resistance, alkali resistance. Use proper ink "The pH value of the firm ink film should be controlled between 7 and 7.5! Change the lightfastness ink or add 0.2% anti-ultraviolet absorber or inorganic mica powder to use ink softer ink.

17. Jam blocking the screen. Both ends of the ink roller are stacked like ink residue. The pigment system of the ink system is not neutralized by alkaline binders and is neutralized. The ink is mixed with paper scraps and plastic shavings. Reducing the pressure of the printing press filter ink to the ink. Select alkali-resistant fillers and alkaline active auxiliaries, and add the appropriate viscosity of the original ink to mediation in the already printed ink.

Basic knowledge of ink storage and printing process

1. The printing press, ink roller and printing plate should be thoroughly cleaned after printing. The waste water should be treated. The ink fountain should be covered and sealed to prevent dust from falling into the dust.

2. Ink should be stored in a cool place to prevent deterioration. Although it is water-based, but because there are alcohols in the solvent, it is forbidden to approach the fire source to prevent heat from deteriorating.

3. Open the drum (tank box) should pay attention to save. Do not bring in impurities, with the use of open. To prevent the ink system amines, ammonia is in an unstable state after volatilization. Do not use light-transmitting barrels (cans, boxes) to prevent UV light from causing instability in the oil.

4. If the gloss is not bright, it can be adjusted by adding tung oil or polymer resin plus acrylic resin or adding magnesium salt or TM coupling agent.

5. The actual printing ink practical degree of 18-25S/25 "C. Coated a 4 cup. If you want to improve the print gloss, you can control the 40-60S/25O C. Coated a 4 cup.

6. Ink, such as drilling too low fluidity storage easy to deposit or easy to print hanging. Suitable for adding cheap aluminum or white carbon or bentonite.

7. Ink drying speed (such as gravure dry 3-5 seconds to dry 100 seconds) visible gravure, letterpress, silk screen printing process may be.

8. For water-soluble printing inks that are difficult to clean, add Triethyl Ethanol or TM-2005 Coupling Agent, and add the cheap LLJ Solvent Allen Solvent to increase the rewetting of the ink or increase the true solvent to reduce the proportion of ink. The ink can be re-filtered due to the coarse clogging of the ink roller. Cleaning the printing press, cleaning the printing plate, cleaning