Remedies for Packaging Printing Ink and Printing Failures

There are lessons to be drawn from the experience gained in labour production.

1. How to deal with pits after printing?

When printing on the aluminized film or coloring on the white ink graphic, pinhole failure often occurs due to too much cohesion of the resin binder in the ink or the ink system. General processing methods: First, increase the amount of ink coating: the second is to add a lighter agent in the ink; third is to add defoamer; fourth is to add thickening thickener; fifth is (gravure) scraper up One point; sixth is to add a stirrer in the ink fountain; seven is to reprint once: the eighth is to replace the resin with small cohesion as the linking material of the ink. 9. to use the ink with good leveling and anti-static or to slow down the printing speed, and strive to reach the elimination of hemp. The purpose of points, pinholes, spots, white spots.

2. What kind of resin is used as the binder for water-based high-temperature artificial leather printing ink?

According to the author's experience, it is the domestic PDL-1 resin that can meet the technical requirements of the same ink in the United States (heat-resistance) of 50° C., and water-resistant washing for 30 minutes. It is both soft and resistant to high temperatures and water.

3. What happened to the multi-use of the market?

The so-called multi-purpose ink, often the product system contains both solvent can dissolve polar substrate, but also can dissolve the solvent of non-polar substrate, plus the introduction of amphoteric resin as the binder material of the packaging printing ink system, can achieve a variety of Range of use. For example, the author changed the solvent in the ink system to a mixture of DMF and MET. The ink produced can be referred to as a water-soluble ink, also known as a non-toxic solvent-based ink, can not only produce a rotary fast gravure printing or flexible letterpress ink. Thickening aids can also be added as manual or mechanical screen printing inks. Both polar paper can be printed. Non-polar plastic products can also be printed. Even simply using tap water, industrial ethanol or diesel engine to adjust the ink viscosity, drying speed.

4. In ink production. Which additives should be prepared for emergency?

Ink anti-expansion gelling additives. Such as TM-3; waterproof texture, flower additives. Such as TM 27, TM-200S, etc.; anti-foam, acupuncture L additives, such as defoamers, light agent: anti-sinking, thickening additives. Such as bentonite, wax powder, etc.; add light and adhesion additives. Such as leveling, cross-linking accelerators, tackifying resins, etc.; oxidation and UV additives. There are 1010 antioxidants, inorganic mica (anti-UV and heat stabilizer) powder, etc.; anti-whitening agent. There are phenyl ether, butyl ether, dicarboxylic acid ester, cyclohexanone, n-butanol and other thermosetting ink initial adhesion additives, such as lower softening point of rosin, petroleum resin and so on. Thermoplastic inks to improve the viscosity of the phenolic resin, epoxy resin and so on.

5. How to prevent static electricity from causing fire accidents during printing?

In order to prevent the occurrence of the aforementioned accidents, an antistatic agent or a polar solvent is usually added to the ink system. Printing companies often install a conductive device on the printer to prevent it.

6. What is the basis of the bleeding inspection method for printing inks?

According to the national QB571-83 ink bleed test method: fully mix the test ink with a knife, and take a small amount stacked on the qualitative filter paper, one hour after the observation of the ink around the infiltration of color, to seep out of the ink without blue Colors, brown or other colors are preferred.

7. How to remedy ink blank lines appearing during printing?

The above-mentioned failure of the ink at the time of printing indicates that the cohesive force of the ink is too large or the amount of the resin binder is excessive. Usually in the ink formulation design, increase the pigment or filler, but also reduce the amount of resin material. If a printing agent is added to the printing ink, it can be salvaged.

8. The loss of high-profile part of the dots during printing results in a lower color density of the graphic ink film. Ink designer how to deal with?

In the face of such failures, antioxidant thermal stabilizers are usually incorporated into the ink system. Printing operators often speed up the printing process or add slow-drying solvents or low-viscosity inks to the ink system. It can also slow down the speed of the printer, or increase the retinubility of the ink.

9. The ink does not have gloss and water resistance after printing. How to remedy? 7 Add a plasticizer or leveling agent to the printing of the solvent ink, while the ink needs to add inorganic salt, which can not only improve the cohesion of the ink, but also improve the print Water resistance.

10. What should I do if the ordinary offset printing is bad when the gold or silver cards are stuck?

According to the author's experience, the introduction of dry oils of different proportions of red and white in the ink system enables the ordinary offset printing inks to have fastness of adhesion gold and silver cardboard.

1 1. What is the cause of damage caused by faded, chipped or improperly cut die-cutting blades after ink printing or varnish painting?

After the usual aluminized film printing candy paper or beer aluminum foil top glazing. Due to the excessive addition of hard resin or leveling aids and anti-adhesion and slipping waxes in the ink system. The surface of the printing ink film is often too hard or the surface of the coating oil is too smooth. The former will appear after the cut fade, lose the block, the latter will not be easy to cut plug. Caused an increase in scrap rates. Second, Excessive ink system soft resin binder (especially softening point resin). During the printing, the ink film or film is dry inside. It is often difficult to cut the prints together after printing, especially during slitting. The form of expression is that it is difficult to cut off and cut, often damaging the cutter or die cutter. When mechanical high speed labeling. It is difficult to adsorb and post, resulting in a decrease in the rate of mechanical labeling. We can test and compare according to different forms, and record and summarize a set of strain improvement methods to remedy.

12. How to deal with the deformation of blanket and flexible letterpress?

Due to the swelling of blankets or flexible reliefs caused by the use of printing inks containing certain resins or strong solvents, the usual treatment methods are: swapping inks containing no strong solvent; wiping the blankets with an anti-oxidizing solution, and also treating with a sulfur solution. A blanket.

13. What happens when ink is printed on the ink film?

Due to the irregular movement between the printing roll and the printing plate (first, roll defects, and second, poor resin dispersion in the ink system), the resulting ink was concentrated on the edge of the plate to form a slight streak. There is also an unevenness in the roll roll L, which causes the excess ink to push one side to form a ridge line. This will require some adjustment of the printing roller, if the soft resin is poorly dispersed, resulting in the ink not standing up, it can be eliminated by adding an appropriate amount of thickening aid or increasing the soft linking material.

4. How can the printing ink not only improve the adhesion but also lose the glossiness after film formation?

Some ink manufacturers often use wax additives to increase the wetting and rubbing resistance of the ink film, but overdosing often results in loss of light in the ink film, and it is difficult to be miscible with the rubber material even during overprinting. Thereby reducing its holding power. During the author's service in Xiamen Yongsheng, the company used a method of adding a coupling agent, thereby increasing the degree of branching of the printing ink and the affinity of the substrate, thereby changing the interface properties between the polymer and the pigment and filler. Improve the interfacial adhesion of printing ink film. And increase the gloss of the graphic ink film.