What are the characteristics of printing ink dryness?

The drying of ink is more complex, and there are mainly the following forms: penetration drying, oxidative polymerization drying, volatile drying, and photosensitive curing. Photosensitive curing of inks is a class of radiation curing or energy curing methods, which include ultraviolet, infrared, thermal curing, electron beam curing and other forms.

The drying of many kinds of inks is often a combination of two drying forms to complete the drying of the ink film. For example, fast-curing offset inks for sheet-fed sheets are dried using a combination of osmosis and oxidative polymerization. During the printing process, if the ink is not dried well, it will cause printing failures such as dirty back of the printing sheet, sticky pages, matte ink film, and "crystallization" of the ink.

In order to speed up the drying speed of the ink, a human drier can be added to the ink. In order to reduce the drying speed of the ink, a drying inhibitor can be added to the ink. Different ink drying forms, the binder is also different, the common mechanical oil binder (permeation drying type), dry vegetable oil binder (oxidation conjunctiva type) and resin type binder (permeation oxidation conjunctiva type) three types.

The drying of ink is more complicated, and there are three main forms. Osmotic drying. Some of the binder in the ink penetrates into the substrate, and the other part is fixed on the surface of the substrate with the pigment and dried.

The non-thermosetting rotary ink used in high-speed web printing machines is generally mainly penetrating drying, mainly printing newspapers and periodicals. Oxidative polymerization drying. The binder in the ink and the oxygen in the air polymerize and form a film on the surface of the substrate and dry.

Offset bright resin ink, bright color, good gloss, mainly oxidation polymerization drying, used to print high-grade fine offset printing products. Volatilization is dry. Part of the binder in the ink volatilizes into the air, and the remaining binder is fixed on the surface of the substrate and dries along with the pigment.

Gravure printing ink is made of volatile solvent as the binder, and the binder used is benzene and xylene, which are harmful to the human body. At the beginning of the twentieth century, water-based inks with water as solvents were developed for gravure printing and flexographic printing, reducing environmental pollution and developing promisingly. Volatile dry inks are especially suitable for printing non-absorbent film materials, such as plastic films, metal foils, etc.

In addition, there are many forms of ink drying, such as ultraviolet, infrared, and thermal curing. The drying of many inks is often a combination of two drying forms to complete the drying of the ink film. For example, fast-curing offset printing inks for sheet-fed paper, which are suitable for printing general offset products, are dried by a combination of osmosis and oxidative polymerization.

During the printing process, if the ink is not dried well, it will cause printing failures such as dirty back of the printing sheet, sticky pages, matte ink film, and "crystallization" of the ink. In order to speed up the drying speed of the ink, a drier can be added to the ink. Commonly used driers are:

Cobalt drying oil, manganese drying oil, lead drying oil, etc. In order to reduce the drying rate of the ink, a drying inhibitor can be added to the ink.

According to the different ink resins contained in the ink, it is divided into two types: physical drying and chemical drying. Secondly, according to the different properties of ink, it can be divided into permeation drying, oxidation conjunctival drying, volatile drying and other forms. Inks with special properties are also dried in the form of photopolymerization drying and ultraviolet drying.

Most ink drying usually uses only one drying method, but some inks are mainly in a certain drying form in the drying process, and at the same time, they are accompanied by other auxiliary drying forms to complete drying. The drying types of inks are shown on the previous page. In general, volatile drying inks and water-based inks, oxidative polymerization inks, and two-liquid reactive inks are dried by natural drying, hot and cold air drying or infrared irradiation.

Heat-curing inks are dried by infrared irradiation. UV-curable inks are dried with ultraviolet irradiation. Which drying method to use in the actual printing production should be selected according to the actual situation such as the ink used, the drying equipment, and the site.

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.

Summary. Oil-based surfaces are printed with oil-based inks and are not oil-based incompatibilities.

Oil-based surfaces are printed with oil-based inks and are not oil-based incompatibilities.

Oil-based ink is a solvent-based ink, which is not easily soluble in water and can be soluble in organic solvents. Oil-based inks can be diluted with organic solvents, and can be printed on both absorbent and non-absorbent surfaces, and are not easy to fade after printing. Oil-based inks are characterized by high ink viscosity, fast drying, water resistance, softness, and good light fastness.

Summary. Hello dear, the oily surface is the ordinary ink printing we often mention, and the ink used is ordinary oil-based ink, that is, the ink is generally insoluble in water.

Hello dear, the oily surface is the ordinary ink printing we often mention, and the ink used is ordinary oil-based ink, that is, the ink is generally insoluble in water.

Water-based printing was used for gravure printing at the beginning, and is now generally used for corrugated box printing, which is relatively simple, but it is a new technology, the ink is diluted with water, so that the mind is cracked but the oil-based ink can not be oh, it is necessary to make plates, but can, the embossing plate made by corrugated boxes is very simple, ** is also relatively cheap, but, after all, it is only a carton, the main role is to make a container, so, if you pay attention to Gao Bu, basically the edge of the carton is very untidy.

However, it is difficult to dry on oily surfaces and is easy to fall.

Because he does not dissolve in water, it is very useful and will not fall.

I'm using it now, and I'm going to drop it.

You're using the poor one. Generally, the use of oil-based ink, oh plastic film stamping ink, now there are many kinds of inks on the market, generally use oil-based ink, stamping fast drying does not fade, performance requirements are not so accurate can be used in Taiwan's Libyai, Germany's SG, Japan's AAA quick-drying ink, as well as the flag's TAT ink, etc. Polyamide ink plastic bag printing.

This ink is suitable for a wide range of materials, including the common Qinghao PE, NY, PP, OPP, etc., which can be used to print. The advantage of this ink is that it has fast volatilization and good adhesion, and it has strong printing performance but great toxicity.

The use of the ink jujube printing file to talk about the wax of the print, the surface of the ink film is smooth and wrinkle-free, the imprint is clear and slippery, in the process of use, the ink will not fall off, the phenomenon of ink dropping, the printing effect of the printed product remains long-lasting.