What are printing auxiliaries?
Date: Aug 23 2024 From: Star Color
There are various types of commonly used printing auxiliaries, which play a crucial role in ink manufacturing and printing processes, enhancing ink performance and improving printing efficiency and quality. Here are some common printing auxiliaries and their functions:
1. Desiccant
Definition: Auxiliary agent used to accelerate ink drying, also known as drying agent or drying oil.
Function: Improve the drying speed of ink and prevent the back from getting dirty.
Common types: red drying oil (drying from the surface), white drying oil (drying ink from the inside out), new desiccants (free of heavy metals, more ideal for use).
2. Anti drying agent
Definition: Auxiliary agent used to delay ink drying, also known as antioxidant.
Function: To prevent premature drying of ink on the printing machine during high temperatures or when ink dryness is too strong, which may affect ink transport.
Common ingredients: Strong reducing agents (such as hydroquinone, catechol, etc.).
3. Diluents
Definition: Auxiliary agent used to reduce ink viscosity.
Function: Improve the fluidity of ink and prevent the formation of film like substances.
Common types: oligomer linseed oil diluent, mineral oil diluent, No.6 ink adjusting oil, etc.
4. Withdrawal agent
Definition: An auxiliary agent used to dilute ink color without significantly changing its viscosity and fluidity.
Function: Adjust ink color concentration to meet different printing needs.
Common types: transparent oil, resin based dilution agent, etc.
5. Release adhesive
Definition: An auxiliary agent used to reduce ink viscosity, also known as a demulsifier.
Function: Reduce the viscosity of ink and prevent printing faults such as paper fuzz and plate stacking.
Common ingredients: aluminum salts (such as aluminum stearate), flaxseed oil, low viscosity alkyd resin, paraffin oil, etc.
6. Defoamer
Definition: Auxiliary agent used to prevent and eliminate bubbles in ink.
Function: improve printing effect and prevent foam from affecting printing quality.
Common types: silicone oil defoamers, low-grade ethanol, etc.
7. Leveling agent
Definition: An auxiliary agent used to improve the flatness of ink laminar flow.
Function: To prevent defects such as shrinkage and wrinkling, and to improve the glossiness and flatness of printed materials.
8. Wetting dispersant
Definition: Auxiliary agent used to improve the suspension stability of pigments in ink.
Function: To prevent pigment agglomeration and maintain the printing stability of ink.
Common types: polyphosphates, silicates, derivatives of polyacrylic acid, etc.
9. Friction resistant agent
Definition: Auxiliary agent used to improve the friction resistance of printed materials.
Function: Increase the smoothness and wear resistance of the printed surface.
Common ingredients: wax substances, etc.
10. Covering oil
Definition: Auxiliary agent used to improve the glossiness of printed materials.
Function: Form a glossy film on the surface of printed materials to enhance their aesthetic appeal.
11. Fillers
Definition: A white solid material that can be uniformly and well dispersed in connecting materials.
Common ingredients: aluminum hydroxide, magnesium carbonate, calcium carbonate, etc.
Function: Adjust the viscosity, flowability, and other properties of ink, while also regulating ink concentration.
12. Anti caking agent
Definition: additives to prevent gel film formation due to surface oxidation and polymerization of coatings during storage.
Action mechanism: capture free radicals generated in the process of coating film formation, interrupt the oxidation polymerization of paint film, and prevent the formation of gel film.
13. Slow drying agent
Definition: An ink additive corresponding to a desiccant, also known as an anti desiccant or antioxidant.
Function: Slows down the drying speed of ink and prevents ink from drying and peeling due to prolonged downtime.
14. Dispersant
Definition: Functional polymer or functional small molecule compound, mainly used for the dispersion of pigments in a system.
Function: Improve coloring power, shorten ink grinding time, increase system stability, prevent floating color and discoloration, etc.
15. Slippery agent
Definition: An additive that makes the surface of the printed ink layer smooth and wear-resistant.
Common ingredients: high molecular weight organosilicon, wax, aliphatic amide, and special small molecule polyamide wax.
16. Extinguishing agent
Definition: An additive used to reduce ink glossiness and achieve matte or extinction effects.
Common ingredients: In addition to metal soaps, special polymer materials, silica, white carbon black, etc. mentioned earlier, it may also include other particles that can scatter light.
Function: Plays an important role in situations where ink glossiness needs to be reduced, such as matte effects in packaging printing.
17. Plasticizer
Definition: An additive that softens the ink film.
Common ingredients: dioctyl phthalate, dibutyl phthalate, etc.
Function: To prevent the ink layer from cracking after printing.
18. Wear resistant agent
Definition: An additive that provides surface wear resistance and scraper adaptability for ink layers.
Common ingredients: wax, inorganic fillers, aluminum oxide, etc.
19. Pattern agent
Definition: An additive that utilizes its incompatibility and shrinkage during ink drying or film formation to create different crack paths.
Common ingredients: ultra-high molecular weight organic silicone resin.
20. PH stabilizer
Definition: Additive used to regulate and control the pH value of water-based ink.
Common ingredients: ammonia water, alkylamine, etc.
Function: Maintain the stability of ink printing state and adjust ink viscosity at the same time.
21. Anti foaming agent
Definition: An additive that prevents the formation of bubbles in ink.
Common types: Substances with anti foaming properties, such as silicone oil.
22. Antibacterial agents
Definition: An additive used to kill or inhibit the growth of microorganisms in ink.
Function: Maintain the hygiene quality of ink and extend the shelf life of ink.
23. Anti rubbing agent
Definition: An additive that prevents printed materials from rubbing against each other during stacking or handling due to incomplete ink drying.
24. Anti reverse printing agent
Definition: An additive used to prevent the printing ink layer from backing onto the back of the paper.
Common ingredients: corn starch, etc.
Function: Improve printing quality, ensure that the ink layer does not penetrate the back of the paper, and affect the overall effect of the printed product.
25. Wetting agent
Definition: An additive used to improve the wettability of ink on the surface of a substrate.
Function: Ensure that ink can adhere evenly and fully to the surface of the substrate, improving the color saturation and clarity of printed materials.
26. Extinguishing agent (already mentioned, but more information is added here)
Definition: An additive used to reduce ink glossiness and achieve matte or extinction effects.
Common ingredients: In addition to metal soaps, special polymer materials, silica, white carbon black, etc. mentioned earlier, it may also include other particles that can scatter light.
Function: Plays an important role in situations where ink glossiness needs to be reduced, such as matte effects in packaging printing.
27 Thickener
Definition: An additive used to increase the viscosity and consistency of ink.
Function: Used in situations where ink adhesion and printing stability need to be improved, such as high-speed printing or printing large-area patterns.
28 adhesion promoter
Definition: Additive used to improve the adhesion between ink and substrate surface.
Function: Ensure that the ink can firmly adhere to the substrate, prevent detachment or peeling, and improve the durability and aesthetics of printed materials.
29. Glossing agent
Definition: Unlike matting agents, auxiliary agents used to improve ink glossiness.
Function: Used in printed materials that require high gloss effects (such as trademarks, brochures, etc.) to make the surface of the printed material brighter and more vibrant.
30. Special additives
Definition: Auxiliary agents developed according to specific printing needs, such as anti slip agents, anti UV agents, etc.
Function: Meet the usage requirements of printed materials in specific environments, such as anti slip packaging, outdoor advertising, etc.
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