Talking about the Important Role of Various Additives in Screen Printing

The range of net shift printing applications is extremely wide, and thus the variety of inks is also numerous. Ink is the main consumable for screen printing and consists of pigments, binders and auxiliaries. Additives In screen printing, in order to adapt the ink to various substrates and work environments, inks are often adjusted to change certain properties of the ink and become a kind of link material. Adjust the ink of the ink must use related auxiliaries, and the performance of the additive directly affects the various indicators of the ink, mainly dissolved resin or grease, adjust the viscosity of the ink, drying speed, cleaning the printing plate. Therefore, it is necessary to correctly adjust the premise of ink and understand the role and relationship of various additives.

Adjusting ink

Adjusting ink, commonly known as varnish, has obvious difference from the practical application of offset varnish in offset printing. It is synthetic resin or T vegetable oil and high boiling point solvent refining. Net transfer printing is commonly used to formulate gold/silver and special inks.

Common specifications are: adhesion enhancer; firmer: dilute.
Slow agent

The fluidity of inks composed of high-boiling compounds and special surfactants reduces the viscosity and makes the ink work normally under different temperatures and environments. It has excellent effects on the improvement of surface flow properties, and can prevent defects caused by some uncertain factors. It is applicable to various solvent-based resins and systems. Experience recommendation: general, wide application range; release of high-grade ink, such as silver paste, liquid crystal, four-color CD, etc.; polycarbonate does not crack; long-term storage does not change the color, does not sink; with solvent-based defoaming, take off Foam function: Special operations such as special fine, thick printing, large area, etc. are smooth; leveling is good, eliminating pinholes: the screen can be easily detached from the printing film without leaving traces or bubbles; new workers use it to become Old workers; In addition, too fast drying, easy to cause drawing, if the ink surface dry fast, thick ink, drawing phenomenon is particularly serious, in this case, adding special slow drying agent can effectively inhibit the occurrence of wire drawing phenomenon. Such as plastic screen printing inks, metal and glass inks, solder mask inks, character inks and self-drying corrosion inks. The dosage is 6∽20%.

Common specifications are: anti-drying agent, anti-blocking agent, concentrate.

Slow release agent

The product is a colorless and transparent liquid, has aromatic flavor, high fat content, low evaporation value, strong opening is a distinctive mark, and is an excellent solvent for various inks. This product is widely used in the plastic [PP / PE, PVC, ABS, PS, etc.], metal, glass, leather nylon fabric, rubber, polyester adhesive and other ink dilution, and printing screen cleaning.

Slow drying agent, adjust the dryness of the ink, prevent it from drying too fast, and dry the ink to block the net. Different types of inks, inks from different origins, have different drying speeds. In the hot summer, the most severe network is blocked. During this time, the slow drying agent plays an important role, especially the pattern with high precision and fine lines. It must be used. Slow-drying agent or slow-retardant agent can solve the problem of blocking mesh and thinning lines in screen printing.

Slow-drying agent, adjust the dry surface speed of the ink to slow down after the hairline edge will be reduced, smooth and smooth ink surface, can reduce the appearance of surface texture. High quality products for silk screen printing. Slow-drying agents should be applied to dilute the ink.

In short, using a slow drying agent to delay and suppress the drying of the ink can effectively control the bad phenomenon such as wire drawing, blocking of the net caused by the ink being volatilized too quickly during the printing process, and ensure the smoothness of the printing process. After the practice of the majority of users has proved that the product is the best choice for ink auxiliary materials.

In a word, it is transferred to ink overnight, and tomorrow’s homework will be known.

783 thinner

The product is a five-color transparent slightly scented and low-fat liquid. The solvent is used as the release and opening water of the screen printing ink, which will not change the original performance and quality of the ink, and the screen printing requirements of different inks under different conditions can be applied, the volatilization speed of the ink in the screen can be reduced, and the ink to be printed can be accelerated. The volatilization rate; improve the full aperture of the ink in the screen to ensure the printing quality after ink transfer, this feature is determined by the low evaporation value of 783 and the strong solvent and its eco-friendly material. The use of the solvent as a screen printing ink dilution and pore opening agent can solve the phenomena of clogging, stencil, and indistinct markings on the edges, and can make screen printing products more clear in pattern, without any erosion on the layout, and is an economic, Solvents that can avoid layout problems for a long time have the effect of reducing downtime and improving quality.

As a diluent, it is also called a standard solvent. It is basically the same as the solvent in the ink, improving the viscosity and fluidity of the ink. When used, the volatilization rate, safety, and miscibility with the binder should be considered. Therefore, the diluent often varies with the type of ink and the printing environment. In order to adapt to different climates and printing conditions, the same kind of diluent is often divided into three kinds of specifications, namely, standard type, quick-drying type and slow-drying type.

The amount of diluent used in screen printing inks is very limited. Many synthetic screen printing inks can only be diluted by 20% [volume fraction] and glossy inks can only be diluted by 5% (volume fraction). The degree to which screen printing inks can be diluted depends on the type, type and grade of the ink and several other factors. The required brightness, transparency and fastness of the ink. The percentage of dilution is usually given by the manufacturer of the ink. In reality, screen printers often use their own experience to determine the consistency of the ink.

Common specifications are: open water; universal solvent; 719 slow dry type; 718 standard type; 717 quick dry type.

Wash net water

Overview: This product is made of refined solvents and other raw materials, is a colorless or light yellow transparent, non-irritating odor, slightly flavored liquid, has good miscibility with various types of ink, and has strong cleaning and opening ability for silk screen printing ink. , Make the screen pattern clear and bright, without any erosion on the layout, but does not affect the screen storage; does not hurt the skin, no skin redness; also improve the printing environment.

The main purpose: cleaning ink, open and close the picture; quick dry release rare; wipe the word repair; replacement liquid; surface treatment agent commonly used specifications are: pore opener / cyclohexanone / substitute liquid / surface treatment agent article number: HT-705 Washing net water surface treatment agent HT-706 Washing net water printing [water], table board glue cleaning HT-707 washing net water membrane switch, sticker, decal HT-708 washing net water environment-friendly HT-709 washing net water plastic , HT-GS circuit board washing metal washing water, a large area of ​​four-color steps: wet, care net, ink, clean [matching disposable gloves, wipe paper.
Reference use process:

The remaining ink shoveled into the ink to listen to, with a cotton ball, sweat cloth and other wet surface of the mesh and the ink where the ink is dissolved, while at the back of the screen there are text patterns at the use of net method, the ink in the embedded hole and The pigment particles are gently lifted, and they are carried away together with the washing net water by the wet cloth, so that the layout is free of ink color. The essence of washing the net is to clean the pigment in the mesh [and carry away the resin], which can reduce the amount of net washing water and achieve good operation results.

In a word, look at the employees' hands and see your skills in time!

additive

The efficacy and performance of the additive should improve the performance of the ink film and contribute to the personalization of the current product. Additives should have a variety of properties and special effects. To meet these requirements, it is necessary to coordinate the relationship between various properties.

Various additives are used in the production, storage, and printing of ink coatings.


The use of additives depends on the composition of the ink, the method of addition, and the amount of addition. First of all, the mechanism of action should be fully understood, and if appropriate selection is made, if it is desired to adsorb on the surface, it is advisable to add additives before the surface absorbs other substances; if it is desired to Physical changes should be selected after full understanding of the properties of the coatings and additives. In addition, if it is necessary to utilize the surface characteristics of the material so that the orientation and separation effects are appropriate, a polymer resin having a good mutual solubility is used. Therefore, the solubility parameter (S.P) of the resin and the additive must be compared before use.


The use of additives is the key to improving the added value of products. However, if you use the wrong method or add too much, it will have the opposite effect. Additives can prevent the defects and defects of the ink film in the printing process of the ink and give it special functions and effects. With the development of the ink industry, it is required to develop new products with higher efficacy and better performance. By adding different additives, the purpose of preventing the lack of ink film and improving the efficacy

Common specifications are: single component; hardener

In a word, good additive products, crows become phoenixes.

Defoamer

Under normal circumstances, water-based inks often use glycerol; oil ink is often used tributyl phosphate, and polydimethylsiloxane [relative molecular weight of 1200-2700] is useful for water-oil inks, the amount of ink added to the 3% . Too little will not solve the small bubbles appearing on the surface of the ink layer of the substrate. Too much will affect the adhesion of the ink layer.

In short, various auxiliary materials have different effects in different environments and different printing conditions, and have a close relationship with the ink, printability and quality of the final printed product. Two or more composites can achieve comprehensive effects more than pure chemical raw materials.

 

 

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