What are the factors that affect the quality of the ink

1. Ink compositionIn general, the main factor affecting the adhesion of ink is that the resin used in the production process of ink does not have the best wetting performance for the substrate. Therefore, the ink produced with this type of resin has poor adhesion. 2. In order to ensure a certain adhesion fastness to the surface of the substrate, the surface treatment of the substrate must be carried out before printing to make the surface of the substrate reach the above.

3. The influence of relative humidity and temperature in the printing workshop on the adhesion of ink. After long-term observation experiments, it can be concluded that with the increase of environmental relative humidity, the adhesion has an upward trend at the beginning, but as the humidity continues to increase, the adhesion begins to decrease again. This shows that there is a critical value of relative humidity suitable for printing, and temperature is an important condition in gravure printing, which has an impact on both drying and the tension of the substrate.

If the temperature is set too high, it will not only affect the longitudinal overprint accuracy, but also cause the adhesion to decrease due to the ink drying too "fast" on the substrate. The ambient temperature suitable for printing should be controlled below 30. The drying temperature is not the same due to the influence of the substrate, ink layer thickness, printing speed and other factors, and the general principle is that it should not be set too high.

4. The influence of ink layer thickness on ink adhesion, in order to understand the relationship between the two, ink adhesion has a downward trend with the increase of ink layer thickness.

The reconstitution of ink refers to the redissolution ability of the ink after printing and drying after encountering the solvent, and the degree of ink reconstitution can usually be judged by the following method - cut two pieces of printing film (respectively printed with different inks) and put them flat on the desktop, add two drops of ethyl acetate on the printing ink layer respectively, and after a second, the two films stand upright, the ink flows down more indicates that the reconstitution is stronger, and the ink flows down less indicates that the reconstitution is weaker. At present, there is no clear quantitative index of the reconstitution of ink, and the reconstitution of ink from different manufacturers may have obvious differences. Because the reconstitution of ink has a certain impact on the quality of printing and composite products, the reconstitution of ink is an important indicator of ink quality, and has a non-negligible impact on the printing and composite quality of flexible packaging composite materials, and the ink industry has paid attention to this, but it is difficult to make a clear explanation theoretically to reduce the adverse impact on product quality.

These things are all things I learned from the material network, haha).

Factors that affect the drying performance of screen printing inks:

1. The auxiliary agent in the ink affects the dryness.

In order to adjust the printing adaptability of the ink in real time, auxiliary agents with different properties and compositions are generally added during the printing process. The addition of auxiliary agents is sometimes to speed up the drying speed of the ink, and sometimes to slow down the drying speed, and it is necessary to add it appropriately according to the properties of different inks.

Second, the humidity and temperature of the printing environment affect the drying performance.

Generally speaking, when the temperature of the screen printing environment is high, the molecular movement in the ink accelerates, which improves the volatilization rate of the solvent, and the drying speed of the ink is much faster than that at room temperature, and when the temperature is low, the drying speed decreases; Similarly, the humidity of the printing site will also affect the drying speed of the ink oxidation condensation, the higher the relative humidity, the worse the penetration and cohesion of the ink, and the less easy the ink will be to dry.

3. The different materials of the substrate affect the speed of drying.

Technicians said that the water content, sizing degree and ink absorption performance of substrates of different materials are also different, which directly affects the coagulation speed of ink in the screen printing process. Generally speaking, materials with less water content and good ink absorption performance are stronger in ink drying performance than materials with more water content and poor ink absorption performance.

Fourth, different pigments affect the dryness of the ink.

Due to the differences and differences in phenol, phenol, aniline and other components contained in different pigments, when these different pigments undergo oxidative polymerization reaction with ink, they will also have obvious differences in the permeability and drying performance of ink.

Summary. Dear and hello, oil-based ink is suitable for 100% cotton, cotton-polyester blend, polyester, dark and light colored cloth, denim and other fabrics. Ink products account for only a small part of the cost of printed products.

Kiss. Hello, I am glad to answer for you, the answer to your question is: the disadvantage of oil-based ink is not environmentally friendly, and it is not widely used.

Hello dear, oil-based inks use organic solvents (toluene, xylene, industrial alcohol, etc.) as solvents. Toluene and toluene are important items for product environmental monitoring. In the process of production, use and waste disposal, the ink is not enough to carry environmental protection.

Dear, hello, oil-based write-off ink is suitable for 100% cotton, cotton-polyester blend, polyester, dark and light colored cloth, denim and other fabrics. Selling ink products only accounts for a small part of the cost of printing products.

The key factor that affects the effectiveness of an ink cleaner product is its composition.

The natural substrate of lipase is triacylglycerides, which can hydrolyze ester bonds into monoglycerides, diglycerides, glycerol and free fatty acids, which can achieve the effect of improving the cleaning performance of water-based ink cleaners.

Ink cleaners are formed by the reaction of surfactants, emulsifiers, penetrants, rubber antioxidants and other additives. It has excellent properties such as oil substitution, energy saving, safe and non-flammable, non-toxic, low price, strong washing and deinking ability, and no erosion of rubber sheets and rubber rollers.

It can be widely used in the printing industry to clean new and old ink on ink rollers, blankets, printing plates (including PS plates) and mechanical tools, whether it is ordinary ink or polymer resin ink, it can get satisfactory cleaning results; It can also clean oil pen words, adhesive glue, spray paint, etc.

Summary. Hello, to make the ink have good printability, the ink should have the following characteristics: the printability of the ink, which refers to the performance of the ink that matches the printing conditions and is suitable for the printing operation. The main ones are viscosity, adhesion, thixotropy, dryness, etc.

What are the characteristics of the ink that the ink should have in order to have good printability.

Hello, to make the ink have good printability, the ink should have the following characteristics: the printability of the oil sock ink, refers to the ink and the printing conditions match, suitable for the performance of the printing operation. The main ones are viscosity, adhesion, thixotropy, dryness, etc. Key Lee.

Supplement: If the thixotropy of the ink is too large, the ink in the ink fountain is not easy to rotate, which will affect the ink transfer function of the ink roller.

Summary. Pro, good ink printability, such as the fluidity of coloring ink, ink transfer characteristics, plastic viscosity, thixotropy, etc. Compatibility with the binder, soft pigment particles, good easy dispersion to ensure high rolling efficiency.

As a solvent printing ink coloring pigment, it should have good solvent resistance, do not change color, and increase the viscosity of the ink. 7.Printing iron inks should withstand heat treatment at 170 °C without color change.

What are the characteristics of the ink that the ink should have in order to have good printability.

Pro, good ink printability, such as the fluidity of coloring ink, ink transfer characteristics, plastic viscosity, thixotropy, etc. Compatibility with the binder, soft pigment particles, good easy dispersion to ensure high rolling efficiency. As a solvent-side royal ink coloring pigment, it should have good solvent resistance, no color change, and increase the viscosity of the ink.

7.Printing iron ink should withstand the heat treatment of 170 °C in the dismantling of the rock, and the color will not change.

High-quality prints, paper performance requirements? Explain.

The smoothness of the paper and its own gloss affect the gloss of the printed matter. The high degree of smoothness of noisy oak is conducive to the formation of a uniform and smooth ink film, which improves the gloss of the printed matter. The gloss of the paper itself can improve the reflectivity of the ink film, especially for transparent inks.

There is a stronger correlation between the gloss of the print and the gloss of the paper itself than there is between the gloss of the print and the absorption capacity of the paper. As can be seen from the above discussion, there is also a correlation between paper smoothness, gloss, and absorbency.

What do you think are the most important knowledge points in the study of printed materials? Why?

1. The continuous update and development of printing technology depends to a large extent on every update and development of printed materials; 2. The quality of the printing product mainly depends on the quality and performance of the material: 3. The quality of each process of printing depends on the technical equipment of the operator, and also depends on the selection and use of the material

Is the ink absorption of paper and the thixotropy of ink as large as possible, and why?

No. Due to the excessive thixotropy, its viscosity is high before the thixotropic phenomenon appears, and it is easy to cause ink plugging and paste failure during printing.

The viscosity of the ink is an important condition that affects the transfer performance of the ink, the fastness of the ink layer, the permeability and the gloss, so the ink viscosity is too large or too small will have a negative impact on the printing quality. If the ink viscosity is too large, it is easy to cause the printing sheet to be dirty, ink transfer, uneven ink distribution, and pull off the paper wool paper powder, so that the layout is pasty or flowery; If the ink viscosity is too small, it is easy to cause printing marks caused by slippery glue, as well as ink transfer, ink distribution and poor ink distribution caused by the imprint fading, ink emulsification, floating dirt and other undesirable phenomena.

The viscosity of the ink mainly depends on the composition characteristics and proportion of the ink, and is also related to the temperature and the speed of the printing machine. When the temperature is low, the ink viscosity is high; When the speed of the printing machine is low, the ink viscosity is high; When the number of ink rollers used on the printing machine is small, the viscosity of the ink is high. This is because the ink is thixotropic, and when the heat is high, the ink becomes thinner and its viscosity decreases.

Because the speed of the machine and the number of ink rollers, determine the size of the friction heat during the movement of the machine, the printing machine in the case of a large friction coefficient, the ink is heated by the movement of external force, so it is easy to thin, and its viscosity also decreases. The viscosity of the ink is adjustable, and according to the printing conditions, some additives are appropriately added to the ink, such as No. 0 and No. 6 ink oil, detackifier, etc., which can achieve the purpose of increasing or decreasing the viscosity of the ink, so as to facilitate the realization of normal printing.

If the surface of the printed paper is smoother and the surface strength of the paper is better, the viscosity of the ink can be appropriately larger. On the contrary, the ink viscosity of the paper with poor surface strength should be smaller to obtain a relatively good printing effect.

In fact, it is dangerous to do anything, now this time is not like this, I have done printing for more than 10 years, I know that printing ink is harmful to the body, but I still insisted on doing it for so long, and I found that there is nothing wrong with it except for high blood concentration, if you like it, friends, you can do it, there is a lot of knowledge in this line of printing. The following is harmful to the human body: printing inks are composed of pigments, binders, solvents, and auxiliaries.

Among them, organic solvents and heavy metal elements are seriously harmful to the human body. There are two types of pigments in inks, inorganic and organic, both of which are insoluble in water and other media, and have bright color and stability. Some inorganic pigments contain heavy metals such as lead, chromium, copper, mercury, etc., which are toxic and cannot be used in printed food packaging and children's toys. Some organic pigments contain biphenyl gum, which has carcinogenic ingredients and should be strictly prohibited.

Organic solvents can dissolve many natural resins and synthetic resins, which are important components of various inks, but some of them will damage the human body and subcutaneous fat, and long-term contact will make **dry cracks, rough, if penetrated into ** or blood vessels, it will endanger human blood cells and hematopoietic function with blood; It is sucked into the trachea, bronchi, lungs, or transmitted to other organs through blood vessels and lymphatic vessels, and may even cause chronic poisoning of the body. Some inks have the problem of toxicity of heavy metal ions, and pigments and dyes contain carcinogenic ingredients, which are very harmful to human health. Although these excipients are not in direct contact with food, some toxic substances will migrate to the food and endanger people's health in the process of food packaging and storage.

Organic solvents such as ethanol, isopropanol, butanol, propanol, butanone, ethyl acetate, butyl acetate, toluene, xylene, etc., are often used in printing inks. Although most of these solvents can be removed by drying, the residual solvents will migrate into the food and harm the human body. The solvents used in gravure inks generally include butanone, xylene, toluene, butanol, etc.

In particular, the residual smell of butanone is strong. Because the pigment particles in the ink are very small and the adsorption force is strong, although it has been heated and dried during printing, it is often not completely dried due to the short time and fast speed, especially the printed matter with a large inking area and a thicker ink layer, and its residual solvent is more. These residual solvents are brought to the compounding process, and after compounding, it is more difficult to escape and slowly migrate and penetrate, so the solvent residues must be kept to a minimum.

More serious than TV radiation, TV radiation can be prevented under appropriate methods, but there is no good solution to the harm of ink to the environment and human body for the time being.

The harm of ink: Ink is currently the largest source of pollution in the printing industry in the world, and the global volatile organic compound pollution emissions caused by ink have reached hundreds of thousands every year. These volatiles will form a more serious greenhouse effect than carbon dioxide, and will form oxides and photochemical smog under the irradiation of the sun, which will seriously pollute the atmospheric environment and affect human health.