According to the author's understanding of the situation throughout the country for many years, China's ink manufacturers and printing manufacturers are honorably classified as light industry departments. Leaders of different departments, like fighting against each other, fighting for market share in packaging and printing, appear different specifications and standards, and some companies lack technical exchange, which casts a shadow over the existing integrated management. The selection of inks in materials, formulation design and use scope and variety of hue are also varied, but the specific failures of printing are generally similar and similar. In order to facilitate the normal use of ink, we are now replying to the questions raised by many companies in the past two months.
1. How to deal with pitting after printing?
When printing on aluminum film or coloring on white ink graphics and text, the cohesive force of the foam in the ink or the resin bonding material in the ink system is too large, and the pinhole (blank dot / pockmark) failure is generated. The general treatment methods are: one is to increase the amount of ink coating; the second is to add a desalting agent to the ink; the third is to add a defoamer; the fourth is to add a thickening thickener; the fifth is (gravure) scraper Move a little; Six is ​​to add a stirrer to the ink fountain; Seven is to reprint once; Eight is to use a resin with a small cohesion as the ink binder; Nine is to level well and antistatic ink or slow down the printing speed, and strive to achieve The purpose of eliminating the faults of pits, pinholes, spots and white spots.
2. What kind of resin is used as the binding material for water-based high temperature resistant leatherette printing ink?
According to the author's experience, 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) is both soft and resistant to high temperature and water rubbing.
3. A kind of water-based plastic ink connecting material resin called core shell as molecular structure, which one is better?
In the author's practice, domestic varieties are PL0826, PL0216A, PL0216B and so on.
4. Can the varnish be equipped with printing ink?
As long as the varnish is added with color paste or colorant and then dispersed or ground, it is a printing ink variety.
5. How is the one-ink multi-purpose ink designed in the market designed?
The so-called one-ink multi-purpose, often the product system contains a solvent that can dissolve both polar substrates and non-polar substrates, and the introduction of amphoteric resin as a linking material for packaging printing ink systems can achieve a variety of Range of use. For example, the author changed the solvent in the ink system to a different mixture of DMF and MET, and the manufactured ink can be called water-soluble ink or non-toxic solvent ink, which can produce rotary gravure or flexibility. Relief printing can also be used as manual or mechanical screen printing ink after adding thickening aids. It can print both polar paper and non-polar plastic products ... even using tap water, industrial ethanol or diesel engine to adjust the ink viscosity and drying speed.
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6. What is the appropriate ratio of coloring materials for printing gold and silver?
In normal packaging, in order to quickly prepare gold ink or silver ink, most of the current users. Generally, gold powder and ink are 17-25% (such as 25% or 17% for offset printing and 9% for gravure printing). Of course, this is just a very general concept. Specific to a colored gold or silver powder, its share should be determined depending on its specific surface area.
7. In the production of ink, which additives should be kept in emergency?
(1) Auxiliary agent for anti-swelling and gelatinization of ink, such as TM-3; (2) Auxiliary agent for waterproof pattern and flowering, such as TM-27 and TM-200S; Foaming agent, desalting agent; (4) anti-settling, thickening aids, such as bentonite, wax powder, etc .; (5) glossing and adhesion aids, such as leveling, crosslinking accelerator, tackifying resin, etc .; ( 6) Anti-oxidation and ultraviolet additives, including 1010 antioxidants, inorganic mica (anti-ultraviolet and heat-resistant stabilizer) powder, etc .; (7) anti-whitening agents, including phenyl ether, butyl ether, diformate, cyclohexane Ketones, n-butanol, etc .; (8) Thermosetting ink initial adhesion aids, such as rosin, petroleum resin, etc. with a lower softening point, phenolic resins, epoxy resins, etc., which improve the adhesion of thermoplastic inks.
8. How to prevent fire accidents caused by static electricity during printing?
In order to prevent the above accidents, antistatic agents or polar solvents are usually added to the ink system. Printing companies often install a conductive device on the printer to prevent it.
9. What is the basis of the bleeding ink inspection method?
According to the national QB573-83—Ink bleeding test method: (1) Fully stir the test ink with a dip knife and take a small amount to stack on the qualitative filter paper; (2) Observe the color of the permeation around the ink after one hour. The bleed ink is not blue, yellowish brown or other colors.
10. How to remedy the blank lines when printing ink?
The above failure of the ink during printing indicates that the ink has too much cohesion or excessive resin binder. Generally, when designing ink formulations, increasing pigments or fillers can also reduce resin binders in an appropriate amount. If printing, adding desalting agent to the printing ink can save it.
11. The loss of high-profile dots 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, antioxidant thermal stabilizers are usually introduced in the ink system. Printing operators often speed up the printing speed or add slow-drying solvents to the ink system or adjust to low-viscosity inks, etc., which can also slow down the printer speed or increase the resolubility of the ink.
12. How to remedy the lack of gloss and water resistance of ink after printing?
Add plasticizer or leveling agent in solvent ink printing, and water ink needs to add easily available and cheap inorganic salts, which can improve the cohesion of the ink, and can improve the water resistance of printed products.
13. What should I do if the ordinary offset printing has poor adhesion when printing gold and silver cards?
According to the author's experience, the introduction of dry oil in different proportions of red and white in this ink system can make the ordinary offset printing ink have the adhesion fastness to gold and silver cardboard.
14. Are there any environmentally friendly UV inks and environmentally friendly UV varnishes?
The domestic manufacturers that really belong to environmentally friendly UV inks and environmentally friendly UV varnish products are: Huaqing (Guangzhou) Group, etc., because in the above product system, one is completely water soluble, and the other is toluene diisocyanate that does not contain carcinogens. Three does not contain toxic photoinitiators, so the Huaqing brand is favored by the packaging and printing industry.
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15. Are there any domestic manufacturers of high temperature water-resistant spray-printed artificial leather ink?
Yes, it is a subordinate unit of Jingang Technology (International) Group: Fujian Fuding Jingang Polymer Material Co., Ltd. This ink uses PUL-1 resin as the ink binder.
16. What methods are included in the inspection method of printing ink quality?
(1) Color; (2) Coloring power; (3) Fineness; (4) Fluidity; (5) Stability; (6) Viscosity; (7) Viscosity appreciation; (8) Flying ink; (9) Gloss; (10) Fixation speed; (11) Dryness; (12) Conjunctival drying; (13) Penetration drying; (14) Chemical resistance such as ethanol; (15) Color bleeding; (16) Oil acid value; 17) Color; (18) Ink characteristic line slope; (19) Intercept; (20) Flow value (expanded diameter); (21) Coating film hardness; (22) Viscosity; (23) Thorough; (24) Surface Tension; (25) Residual amount of solvent; (26) Thoroughness; (27) PH value; (28) Water resistance; (29) Abrasion resistance and other 29 national standards.
17. What causes discoloration, lumps or irregular cuts (while operating die-cutting blades) after ink printing or varnishing?
After the confectionery paper or beer aluminum foil is printed on the usual aluminum coating film, the excessive hard resin in the ink system or the excessive addition of leveling aids and anti-sticking slip waxes are often not due to the rigidity of the printed graphic ink film surface. If it is too strong or the surface of the varnish is too smooth, the former will be discolored and blocky after slitting, and the latter will not be easily cut and blocked, resulting in an increase in scrap rate. Second, the excessive amount of soft resin binder in the ink system (especially the resin with a too low softening point), the surface of the ink film or oil film is dry and wet during printing, and it is often difficult to divide the printed product after printing, especially when slitting Blocking, the manifestation is: it is difficult to break and cut, often damage the cutter or die knife. When the machine is labeling at high speed, it is difficult to attract and post, resulting in a reduction in the mechanical labeling rate. We can compare and compare different types of tests, record and summarize a set of strain improvement methods to remedy it.
18. How to deal with the deformation of blanket and flexible letterpress?
Due to the use of printing inks containing certain resins or strong solvents, it causes swelling of the blanket or flexible relief. The usual treatment methods are: (1) exchange ink without strong solvent; (2) wipe the blanket with an antioxidant solution, or treat the blanket with sulfur solution before use.
19. What should I do if there are streaks in the graphic ink film after ink printing?
Due to the irregular movement between the roller and the printing plate (one is the roller defect, and the other is poor resin dispersion in the ink system), the result is that the ink is concentrated on the edge of the plate to form a slight streak. There are also uneven adjustment of the roller hole, which causes the excessive ink to be pushed to the side to form a ridge line. This requires adjustment of the rollers. If the soft resin in the ink system described in this article is poorly dispersed and the ink cannot stand up, it can be eliminated by adding a thickener or increasing the amount of soft binder.
20. How can the printing ink be filmed to improve adhesion without losing gloss?
This requirement is understandable. Some ink manufacturers often use larger wax additives to increase the wetting and rubbing resistance of the ink film, but excessive addition will often lead to the loss of gloss of the ink film, and it is difficult to dissolve with the rubber compound during overprinting compounding, thereby reducing its Holding sticky. For this reason, during the service of Xiamen Yongsheng, the company adopted the method of adding coupling agent, thereby improving the branching degree of printing ink and its affinity with the substrate. As a result, the interface properties between the polymer and the pigment and filler are changed, thereby improving the interface adhesion of the printing ink and improving the gloss of the graphic ink film. This chemical reaction, which generates Si-O-Si chemical bonds, couples the ink and the substrate, which is the origin of the coupling agent.
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