Ink knowledge: detailed analysis of ink composition and the function of various additives

Printed ink is a slurry collome consisting of a uniform mix of colors, connecting materials, fillers, etc. As a viscous fluid ink, due to the different properties of its varieties are also different, that is, there are thick and rare points, sticky strong and weak differences, fast dry and slow dry and so on. Therefore, a correct understanding and understanding of the composition of ink in the role of ink, for accurate adjustment of ink characteristics, to meet a variety of printing conditions, improve the quality of product printing is of great significance

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, how can colors be connected in ink
colors include pigments and dyes. The colored materials used in printing inks are usually pigments, but also some dyes, they are very fine particles of colored substances. Pigments are generally insoluble in water, nor in connection with the material, in the solution most of the suspended state, and dyes in the connecting material is generally soluble.
pigments have a great influence on the performance of inks, the relative density of inks, transparency, heat resistance, light resistance and resistance to chemicals, etc., are related to pigments. The role of pigment in ink is obvious, its color determines the color of the ink, its dosing size determines the concentration of ink, its use of ink to a certain degree of consistency and other physical properties, its use in a certain degree affects the dryness of the ink, oxidation polymerization drying-based ink performance is particularly prominent. In addition, the durability of inks in all aspects is also determined by pigments.
So, due to different ink varieties, uses, pigments are also used differently, which requires printing should be based on product use, process characteristics to choose the appropriate ink, such as high-speed multi-color printing press printing products should be selected bright, fast solid, wear-resistant characteristics of the ink, to ensure printing quality.
, what role does the connecting material play in the ink
The connecting material is a kind of fluid with certain viscosity and viscosity, and its function is multi-faceted. As a carrier of pigments, it acts as a mixture of solid particles such as powdered pigments and enables the adhesive pigments to eventually attach to the print.
Connection material in the impact and determine the ink's fixing speed, drying speed and drying type at the same time, but also to the ink with a certain amount of luster, friction resistance, anti-yellowing and impact resistance and other physical properties, and to a large extent determine the viscosity of the ink, viscosity, yield value and mobility, so, high-quality ink from high-quality connecting materials.
If the connection material preparation or production process is not suitable, ink printing not only lack of bright, shiny good color, but also will cause paste, dirt, transmission, paper-pulling hair and no ink and other chain quality failure, to normal printing brings certain obstacles. Therefore, the connecting material is a factor that has a great influence on the ink quality.
, what is the moral of the filling material coming at this time
Filler is a kind of white solid substance that can be evenly and better dispersed in the connecting material, is a fine powder. When the filler is mixed and ground into a slurry in the connecting material, it is between transparent and opaque. Common fillers are aluminum hydroxide, potassium sulfate, magnesium carbonate and calcium carbonate.
Filler in the ink on the one hand can play a role in regulating ink consistency, viscosity, viscosity, fluidity and yield value and other ink, on the other hand can play the role of adjusting ink concentration, that is, when the ink concentration of large color depth, the addition of filler can achieve a dilution effect.
filler in the ink although there is an auxiliary side, but its performance has many requirements consistent with pigments, in the oxidation polymerization drying-based ink it also plays a role in affecting dryness.
4, additives in the ink in the amount can not be ignored
For printing operators, ink printing suitability is good, a can cover can be put into use, it is of course the most convenient and hassle-saving. However, due to differences in the temperature and humidity of the printing environment, printing material characteristics and printing process conditions, such as paper water content PH value and printing machine speed, overprinting methods, and so on, and although the ink variety is diverse, but the proportion of pigments, connecting materials and fillers used in each ink is almost constant, often can not meet the printing requirements of various conditions. Therefore, from the point of view of improving the efficiency and quality of printing, according to the variety of printing conditions, in the selected ink to add some additives, to ensure normal printing is beneficial.
, ink in printing to improve what
commonly used ink usually have 6 and 0. No. 6 ink is used to increase the fluidity of the ink, improve the transfer of ink, reduce the concentration, viscosity and dryness of the ink. No. 0 oil has a greater viscosity, in the ink viscosity is insufficient to cause ink hair flowers and even poor cloth ink, the appropriate amount of No. 0 oil loose mix added to the ink, can achieve the role of increasing ink viscosity and adhesion.
6. Auxiliary materials are the basis for composition comparison and performance applications
Auxiliary materials in inks are usually divided into anti-adhesives, desiccants, additives, desalinants, friction inhibitors, anti-drying agents, and shiny oils. Understanding to understand, but the more profound meaning, and how many people really realize that the author through access to a large number of information, will obtain knowledge to share with you.
First of all, anti-stick, in the ink to add the appropriate amount of anti-adhesive, can prevent the printing stack due to the ink layer is not dry and cause the back of the dirty, thus ensuring product quality;
red oil is a cobalt-based desiccant, purple-red slurry liquid, suitable for addition to dark ink, its dry form is based on the surface of the ink layer, the dosage is between 1% and 2%.
White dry oil is composed of cobalt, manganese, lead metal salt mixture, commonly known as mixed dry oil, with the ink film inside and outside the overall drying effect, its dryness is not strong red dry oil, but the drying effect is better, and it is white translucent, added light ink after no effect on the color;
additive it is a white transparent paste-like substance, the appropriate amount of ink can eliminate the paper hair, powder phenomenon, to prevent the layout, rubber cloth pile powder paste disease occurred;
anti-removal agent is an ointment-like transparent substance, with good gloss and good printing performance, add color ink can play a dilution ink color printing process effect;
anti-friction agent It is made of polyethylene wax and high boiling point kerosene and other wax paste, add 1%-5% wear-resistant anti-friction agent to the printing ink, can improve the wear resistance of the printing ink layer, and can reduce ink viscosity to reduce the occurrence of adhesion Dirty opportunity, it is made of polyethylene wax and high boiling point kerosene and other wax paste, in the printing ink to add 1%-5% of the wear-resistant agent, can improve the wear resistance of the printing ink layer, and can reduce the ink viscosity to reduce the chance of sticky;
Finally let's look at the bright oil, bright oil in addition to being used for lighting, plate printing field ink to add the appropriate amount of bright oil, can not only increase the fluidity of the ink, is conducive to the uniformity of the ink, and can greatly improve the brightness of the printing ink, so that the ink layer has a certain wear resistance, sun resistance and prevent fading good effect. Because the bright oil conjunctivation is fast, after adding ink to make the printing ink layer drying speed is also accelerated, so the ink should take full account of this.