The use of common ink additives and precautions (on)

With the development of technologies and processes, oil-based inks have been phased out and many new inks have been continuously developed. However, resin-based inks (inks made with resin as the main link material) are still the most used inks in offset printing production. Variety. In the process of using the ink, it is often necessary to adjust the printing properties of the ink according to the characteristics of the print, the working environment, the production process, and the like, so that the printer needs to understand the use performance of the ink adjuvant. Below, the author will briefly introduce the role and use of several kinds of ink adjuvants that are commonly used in the work, as well as some problems that should be noted during use, for reference by peers.

First, viscosity and fluidity modifier

There are many kinds of them, the role is to adjust the ink's fluidity and viscosity, mainly including the ink varnish and remover and so on. The traditional varnish is mainly composed of zero oil (ie, external oil) and six oils of six varieties. The viscosity is the largest in the zero oil, and then decreases to the sixth oil, but some are not commonly used. Of course, there are other varieties of varnish.

The main introduction is as follows:

1. No.6 oil

It is one of the most commonly used ink auxiliary agents. It is mainly used to increase the fluidity of the ink, and at the same time, it can also reduce the viscosity of the ink. The amount of resin ink formulated is generally less than 5%. After adding it will reduce the ink dryness and gloss.

2. No. 0 transfer ink (also known as external oil)

The one with the highest viscosity in the varnish, with almost no fluidity, is a transparent elastic fluid with a relatively high viscosity. Mainly used to increase the viscosity of the ink, reduce the degree of emulsification, adjust the viscosity of the ink before and after the color group, so that the viscosity of the printing ink is slightly larger, and the transferability of the ink is improved. The amount is generally less than 5% so as not to affect the dryness.

3. Resin varnish

Viscosity is greater than that of No. 6 oil and is used to adjust the flowability of the ink, but it does not affect the viscosity of the ink. The amount is generally about 3%. The addition of the varnish does not affect the gloss and adhesion of the ink, and has little effect on the drying properties.

4. Thinner

Viscosity is smaller than that of No. 6 oil, which can increase the fluidity of the ink and reduce the viscosity. It has the characteristics of small amount but obvious effect. The amount is generally less than 3%, after adding basically does not affect the gloss and dryness of the ink.

5. High boiling point kerosene (aviation kerosene)

Its boiling point is 250~290°C. It is an excellent ink adjuvant and has good miscibility with ink. It can be used directly in ink to reduce the viscosity of the ink and increase the fluidity to a certain extent. The effect is obvious. The amount is generally 1% to 2% to meet the requirements, of course, can also be increased or decreased as appropriate. After adding, it will not affect the gloss and adhesion of the ink, and has little effect on the drying property.

6 . Remover (also known as detackifier)

It is a paste-like body and it is also one of the traditional commonly used ink adjuvants. It has the effect of lowering the viscosity of the ink but does not substantially increase the flowability. It can be used with resin varnish, No. 6 oil, etc., and can also be used alone. The amount is generally less than 5%, too much can easily lead to dirty version and reduce the ink gloss, dryness and adhesion. Need to cover the film should more strictly control the amount of use, otherwise it will cause film lamination and poor adhesion and other ills.

7. Ink improver (also called ink additive)

Paste is a new type of ink adjuvant. With the ink has a very good miscibility, adding ink does not dilute the ink. Both can reduce the viscosity of the ink, but also increase the fluidity, the amount is usually between 3% to 8%, but also increase or decrease, as appropriate. Under normal circumstances will not affect the ink drying, but the excess will reduce the ink's gloss and adhesion.

(to be continued)

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