Paper Characteristics The effect of ink properties on printing

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.

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.

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.

Sheet-fed offset printing usually uses oil Chang side ink, which is generally divided into two types: UV ink and ordinary ink. Among them, ordinary inks can be divided into three categories: solvent-based, water bucket closure and UV base. Different types of inks are suitable for different sheet-fed offset printing processes and printing effects.

Here are some of the features of the ink type:

Solvent-based ink: This ink has high color saturation and gloss, fast drying time, and is suitable for high-speed machine printing. However, it is volatile, produces harmful gases, pollutes the environment, and has certain health risks to printing workers.

Water-based ink: This ink is environmentally friendly, does not contain harmful substances, and is the main choice for modern environmentally friendly printing products. It has a long drying time and is easily affected by humidity, so it is necessary to reasonably control environmental conditions such as temperature and humidity.

UV Base Ink: This ink dries in a very different way than traditional air crack inks. It needs to be dried by ultraviolet curing technology, and a small amount of gas is released during the solidification process, and it is necessary to check whether the machine can meet the requirements for use.

It can be roughly distinguished from the literal meaning:

Oil-based printing is the ordinary 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 initially used for gravure printing.

Mandarin oranges are now generally used for corrugated boxes.

Printing is relatively simple, but it is a new technology, the ink is diluted with water, but the oil-based ink can not be oh, all need to make plates, but can, corrugated boxes with embossed plates are very simple, ** is also relatively cheap, but, after all, it is only a carton, the main role is to make containers, so, you pay attention to the cavity of Zheng Tuan, basically the font line edge of the carton is very untidy, hehe.

As for the technical level, it is indescribable, hehe, forgive me.