In-depth printing workshop to explore ink suitability
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1. How to deal with the pitting after printing?
When printing on an aluminized film or coloring a white ink image, the cohesive force of the resin binder in the ink or the ink system is too large, and the resulting pinhole (blank point/pitting) is broken. The general treatment methods are as follows: one is to increase the amount of ink coating; the other is to add a lightening agent to the ink; the third is to add a defoaming agent; the fourth is to add a thickening thickener; the fifth is to (gravure) the scraper upwards. Move a little; Six is to add a stirrer in the ink fountain; Seven is to reprint once; Eight is to use a resin with small cohesive force as the binder of the ink; Nine is a flat and antistatic ink or slow down the printing speed, and strive to achieve Eliminate the purpose of malfunction of pitting, pinholes, spots, and white spots.
2. What resin is used as the binder for the water-based high temperature resistant artificial leather printing ink?
According to the author's experience, it is the domestic PDL-1 resin that can meet the technical requirements of similar inks in the United States (heat-resistant 1500C, water-resistant washing for 30 minutes), which is soft, high temperature resistant and water-resistant.
3. A water-based plastic ink binder resin called a core shell with a molecular structure. Which one is better?
In the author's practice, domestic varieties include PL0826, PL0216A, PL0216B and so on.
4. Can glazing oil be equipped with printing ink?
The varnish is completely a printing ink variety as long as it is added to the color paste or colorant and then dispersed or ground.
5. How is the ink used in the market designed?
The so-called multi-purpose, often contains a solvent that can dissolve polar substrates and dissolve non-polar substrates, and the introduction of amphoteric resin as a binder for packaging printing ink systems can achieve a variety of Use range. For example, the author changed the solvent in the ink system to a different mixture of DMF and MET. The ink produced can be called water-soluble ink or non-toxic solvent ink, which can not only produce rotary fast gravure or flexibility. The embossing can also be used as a manual or mechanical screen printing ink after adding a thickening aid. It can print both polar and non-polar plastic products... even using tap water, industrial ethanol or diesel to adjust ink viscosity and dry speed.
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6. What is the appropriate proportion of coloring materials for printing gold and silver?
In the normal packaging, in order to quickly prepare gold ink or silver ink, most of them are mostly used. Generally, gold powder and ink are 17-25% (such as offset 25% or 17%, gravure is 9%). Of course, this is just a very general concept. Specific to a certain color gold or silver powder, it is also determined by its specific surface area.
7. Which additives should be prepared for emergency in ink production?
(1) Ink anti-swelling gelling aids, such as TM-3; (2) waterproof lines, hair auxiliaries, such as TM-27, TM-200S, etc.; (3) anti-foam, pinhole additives, such as Foaming agent, lightening agent; (4) anti-settling, thickening aids, such as bentonite, wax powder, etc.; (5) lightening and adhesion aids, such as leveling, crosslinking accelerators, tackifying resins, etc.; 6) Anti-oxidation and UV auxiliaries, including 1010 antioxidants, inorganic mica (anti-ultraviolet and heat-resistant stabilizer) powder, etc.; (7) Anti-whitening agent, phenyl ether, dibutyl ether, diformate, ring Ketone, n-butanol, etc.; (8) thermosetting ink initial adhesion aids, such as rosin, petroleum resin, etc. with lower softening point, and phenolic resin and epoxy resin for improving the adhesion of thermoplastic inks.
8. How to prevent fire accidents caused by static electricity during printing?
In order to prevent the occurrence of the above accident, an antistatic agent or a polar solvent is usually added to the ink system. Printers often add a conductive device to the printer to prevent it.
9. What is the basis for the bleed test method of printing ink?
According to the national QB573-83 - ink bleed test method: (1) fully agitate the test ink with a squeegee, and take a small amount on the qualitative filter paper; (2) observe the color of the penetration around the ink after one hour, The oozing ink is not blue, yellowish brown or other colors are preferred.
10. How to remedy the blank line when the ink is printed?
The ink has the above-mentioned failure during printing, indicating that the ink cohesion is too large or the resin binder is excessive. Usually, in the design of the ink formulation, the pigment or the filler is increased, and the resin binder is also appropriately reduced. If you print, add a thinning agent to the printing ink to save it.
11. The high-tone partial dot loss during printing causes the color density of the graphic ink film to be low. How should ink designers respond?
In the face of such failures, an antioxidant heat stabilizer is usually introduced into the ink system. Printing operators often speed up the printing speed or add a slow drying solvent to the ink system or adjust to a low viscosity ink, etc., which can also slow down the speed of the printer or increase the resolubility of the ink.
12. How to remedy the ink after printing without gloss and without water resistance?
Adding a plasticizer or a leveling agent to the solvent ink printing, and adding an easily available and inexpensive inorganic salt to the ink can improve the cohesive force of the ink and improve the water resistance of the printed product.
13. What should I do if the offset of ordinary offset printing is poor when printing gold or silver cards?
According to the author's experience, the introduction of red and white different proportions of dry oil in the ink system can make the ordinary offset printing ink adhere to the adhesion of gold and silver cardboard.
14. Is there environmentally friendly UV ink and environmentally friendly UV varnish?
The domestic manufacturers that are truly environmentally friendly UV inks and environmentally friendly UV varnish products are: Huaqing (Guangzhou) Group, etc., because the above product system is completely water-soluble, and the second is toluene diisocyanate containing no carcinogens. The three non-toxic photoinitiators are therefore favored by the packaging and printing industry.
15. Is there a domestic manufacturer of high-temperature water-based sprayed artificial leather ink?
Yes, it is a subsidiary of Jingang Technology (International) Group: Fuding City, Fujian Province, Jingang Polymer Materials Co., Ltd. This ink was selected from PUL-1 resin as the ink binder.
16. What methods are included in the inspection method for printing ink quality?
(1) color; (2) tinting strength; (3) fineness; (4) fluidity; (5) stability; (6) viscosity; (7) viscosity increase; (8) flying ink; Gloss; (10) fixation speed; (11) dryness; (12) conjunctival drying; (13) osmotic drying; (14) chemical resistance to ethanol; (15) bleed; (16) acid value of oil; 17) color; (18) ink characteristic line slope; (19) intercept; (20) flow value (expanded diameter); (21) film hardness; (22) viscosity; (23) dry; (24) surface Tension; (25) solvent residue; (26) dryness; (27) pH; (28) water resistance; (29) abrasion resistance and other 29 national standards.
17. What is the cause of ink coloring or varnishing after coloring, dropping or not tidying (and operating the die-cutting blade)?
After the usual aluminized film printing candy paper or beer aluminum foil top mark, due to the excessive amount of hard resin in the ink system or the excessive addition of leveling aid and anti-adhesive slip wax, it is often not due to the surface hardness of the printed ink film. If the surface is too strong or the varnish is too smooth, the former will appear to be discolored and dropped after cutting, and the latter will be difficult to cut and block, resulting in an increase in the reject rate. Second, the soft resin binder of the ink system (especially the resin with too low softening point) is wet inside the ink film or the oil film surface during printing, and it is often difficult to cut the printed product after printing, especially when cutting. Blocked, the form of expression: difficult to break, cut, often damage the knife or die cutter. When the mechanical high-speed labeling, it is difficult to adsorb the post, resulting in a reduction in the mechanical labeling rate. We can test the comparison according to different forms, and record a set of strain improvement methods to remedy.
18. How to deal with the deformation of the blanket and the flexible letterpress?
The expansion of the blanket or flexible relief is caused by the use of printing inks containing certain resins or strong solvents. The usual treatment methods are: (1) exchange of ink without strong solvent; (2) wiping the blanket with an anti-oxidizing solution, or treating the blanket with a sulfur solution before use.
19. What should I do if there is a streak on the ink film after the ink is printed?
Due to the irregular movement between the roller and the printing plate (one is the problem of the roller, and the second is the poor dispersion of the resin in the ink system), the ink is concentrated on the edge of the plate to form a slight streak. There is also an uneven adjustment of the roller holes, which causes excessive ink to be pushed to one side to form a ridge line. This is to adjust the roller to a flat condition. If the soft resin in the ink system described in this article is poorly dispersed, the ink will not stand up. It can be eliminated by adding a thickener or adding a soft binder.
20. How can the printing ink be cured to improve adhesion without losing gloss?
This kind of request is understandable. Some ink manufacturers often use increased wax additives to increase the wetting and squeezing resistance of the ink film, but excessive addition tends to cause the ink film to lose light, even when the overprinting compound is difficult to dissolve with the rubber compound, thereby reducing its Hold the sticky force. For this reason, during the service of Xiamen Yongshengxing, the company adopted the method of adding coupling agent, which improved the branching degree of printing ink and the affinity with the substrate. This changes the interfacial properties between the polymer and the pigment filler, thereby improving the interfacial adhesion of the printing ink and improving the gloss of the ink film. This chemical reaction takes place to form a Si-O-Si chemical bond, which couples the ink and the substrate, which is the origin of the coupling agent.