At present, there are many manufacturers of screen printing inks, and there are many varieties. There are not only domestic screen printing inks, but also many screen printing inks produced by foreign manufacturers. Domestic screen printing ink manufacturers include: Tianjin Ink Factory, Shanghai Ink Factory, Wuxi Hushun Ink Factory, Zhejiang Yuhang Xingqiao Ink Factory, etc., foreign production screen printing ink manufacturers have Japan's Seiko ink, Imperial ink, Toyo Ink, Shijo Chemicals Ink, British color ink, Germany's Baolong ink, Switzerland's Koli ink, etc., can be purchased in the domestic market. The quality is high and low, the price is expensive, and there are many special inks, which provide good conditions for screen printing production. The following points should be noticed when choosing: >> Sign card industry: all kinds of scenery unlimited
1. Different materials use different inks
There are two types of materials commonly used in the production of signage and panels: metal, plastic, adhesive, etc. Metals are divided into two types: coated and uncoated. There are many types of plastics such as: ABS, PC, PVC, PET, PP, plexiglass, etc. , Stickers on the surface of paper, plastic, aluminum foil and so on. In the online printing of these materials, the first thing to consider is the combination of ink and substrate. Screen printing ink manufacturers produce different types of screen printing inks for different materials. In the purchase of ink, we must first look at the instructions to see if the selected varieties are correct.
2. After the ink is selected, try printing again to check if the appearance effect and reliability meet the requirements.
After selecting the ink, it is necessary to conduct a trial printing. First, check whether the appearance effect is satisfactory, such as whether the color is bright, whether the thickness is appropriate, and whether there is any impurity in the transparent ink.
In addition, different screen printing parts often have different special requirements, some require high or low temperature resistance, some require good wear resistance, and some require resistance to alcohol, gasoline and so on. These special requirements must be checked at the time of printing, and the ink can be put into production only after passing the test.
3. When using screen printing inks, compare their performance
In the screen printing operation, it is hoped that the ink is not easy to block the net, dry fast, smooth, soft, toothpaste-like ink is easy to use, and sticky ink is not easy to use. We hope that the ink will work slowly on the screen without blocking the network, and it will do so quickly after printing. General use of light-curable ink is easy to do without blocking the network, dry and fast; using volatile drying ink selection performance and appropriate deployment, can also be done; and thermosetting ink, screen printing is not easy to block the network but dry slowly , Also need to be heated; two-liquid reaction ink, screen printing performance, drying faster. In addition, the viscosity of the ink, ie, thick and thin, should also be appropriate. It is necessary to stand upright, not guilty, and have a certain degree of leveling, so that the edges of the printed lines can be neat and full.
4. Choose on price
Generally high-grade prints, to choose high-grade imported oil black, such as printing light boxes. The printing of low-grade printing inks with low prices. Also look at the ink thick, such as volatile drying ink, the same is a barrel of one kilogram of ink and some prepared thin, and some prepared thick, add thinner before use. Compare the two, perhaps the latter is more worthwhile.
The above four points must be noted when selecting inks. The specific selection of screen printing inks is described below:
First, metal ink
In the smooth metal surface printing, often used two very good adhesion liquid ink, heat curing ink, in order to get a good bonding force. In order to improve the binding force, the metal surface is often oxidized to increase the bonding force with the ink. Such as the Japanese Seiko, the Empire, Shanghai ink factory, etc. have a good performance of metal ink.
Some spray paint on the metal surface, such as amino baking paint, alkyd paint, etc., according to paint performance selection of ink. If the amino baking paint is sprayed under the above conditions, the glass ink and meter ink of the Tianjin Ink Factory can be used for screen printing, which has good bonding power, low price, and convenient use.
Second, plastic ink
1. Plastic bag screen printing
In the polyethylene plastic bag printed on the identification of polyethylene film is generally required to undergo EDM treatment to print, if you have made a pocket, but also need to screen printing, then you can choose Zhejiang Yuhang Xingqiao screen printing ink factory processing free polyethylene screen printing Ink can basically meet the general requirements.
2. Polypropylene film or bottle online printing
Printing inks of polypropylene materials, domestic Wuxi Husong ink factory, Jinlong ink factory have a special brand, foreign countries have Japan's Imperial ink and Seiko ink, but also has good performance polypropylene ink. The choice of such ink depends on the user's requirements, some require resistance to alcohol, and some also require resistance to gasoline, etc., to conduct tests to select the appropriate brand of ink.
3. Screen printing ink of PVC material
PVC has soft and hard points, some manufacturers use two kinds of inks respectively, such as Wuxi Hushun Ink Factory; some manufacturers use an ink, soft and hard PVC can be used, IPI, Toyo, Jinlong and other inks are also available.
4.Ink for ABS and PC materials
Some of these inks are dedicated, such as the Jinlong 25 series, which is dedicated to ABS. However, commonly used IPI7, 8 prefix inks, Toyo 7 and 8 prefix inks, Jinlong 10 series inks, India ABS, PC, hard PVC are available. This should also be based on the needs of users, such as to do alcohol-resistant, high temperature and other special requirements of the test.
5. Screen printing plexiglass ink
Jinlong 21 series ink is specially printed plexiglass. Other ink factories such as Wuxi Hushun Ink Factory also have printed inks for plexiglass for selection.
6. Screen Printing PET Material
The adhesive surface layer is PET, Zhejiang Yuhang Xingqiao silk screen printing ink factory has a special ink for use. The general PET sheet can be made of multi-functional ink produced by the Wuxi Hushun Ink Factory, and the bonding strength is also good. High-demanding Japanese Seiko inks are used for the printing of various brands of PET screen printing inks.
Third, other ink
1. Gold ink and silver ink
The gold ink on the screen printing plate is mostly prepared with 3:7 of IPI's D170, D175 gold powder and 777 varnish, then diluted with 783 solvent and added with a little defoamer. Silver powder, ie aluminum powder, is formulated with 1000 mesh aluminum powder and 777 light oil. If the content of gold powder or silver powder is small, the metal feeling is not strong; if the metal powder is excessive, floating color will be produced after screen printing. Singapore EPK inks now have ready-made inks (gold and silver), screen printing uniform texture, strong metal, good performance, suitable for PVC materials.
2. Translucent white ink
Diluted by white ink plus colorless transparent ink, so that the content of titanium dioxide is reduced to translucent.
3. Transparent ink
Commercially available clear inks are colorless, transparent, and transparent screen printing inks such as red, green, blue, and yellow. It is commonly used in the transparent window screen printing on PC soft panel and transparent PC panel. It is made of transparent colored pigments and is more expensive. Requires thin and uniform screen printing, no variegated spots.
4. Four-color dot ink
The ink factory produces a variety of single-color inks and four-color dot inks. Instead of four-color dot inks, single-color inks of the same hue cannot be used because the former is opaque and the latter is transparent. The latter two colors can be stacked into a third color, such as yellow on the blue to become green; if the use of opaque ink only play the role of cover. Four-color dot inks come in different types (PVC, synthetic paper, plexiglass, etc.) and cannot be misused. Different materials must be used in combination with different inks.
5. Conductive ink
There are two kinds of carbon ink and silver ink. The silver ink here is made of metallic silver. The price is very expensive. The printed circuit board of the touch switch can be printed. Carbon ink can print TV remote control circuit board.
6. Etching ink, etched ink and etching ink
Etching ink is a type of ink that is directly printed on glass and printed on it. It stays on the glass for 5 to 10 minutes and then is rinsed off with water to form a text pattern on the sand surface instead of the original HF etching and sandblasting process. . This ink, which is available in Canada, South Korea and China, can be bought in the market.
Imitation etching ink is a type of ink printed on gold and silver card paper that has been cured by light to form a sand surface. Both imported and homemade inks are available.
Anti-etching inks, also known as resist inks, can be printed on circuit boards or signs, and can withstand the corrosive effects of ferric chloride and cupric chloride solutions after printing. Then it is removed with a lye. This ink is made in China and can be purchased.
7. Adhesive materials with ink
Stickers on the surface of paper, PVC, PET, PP, aluminum foil, etc., according to the surface of different materials used ink.
The surface is paper, what ink is available, what can be used on hand, with the principle of good printing, quick-drying, and cheap price; the surface is PVC, and the ink of printed PVC can be used, such as EPK ink of Singapore, Taiwan World Ink and so on; surface is PET, there are special inks, such as 3# ink of Yuhang Xingqiao Ink Factory; the surface is PP film, but after coating, it is not necessary to use polypropylene ink, and the range of ink selection is very large. A variety of inks; the surface of metal foil, it should be selected from the dry metal ink as well.
8. Other inks
Such as fluorescent ink, luminous ink, ink on the reflective film in the sign, panel production have applications, according to different circumstances.
Summary: The correct selection and deployment of screen printing inks has a great influence on the quality of screen printing. Screen printers should learn more about inks in order to facilitate ink selection and deployment, and they must continuously explore and summarize in practical work. Get the job well done.
Reprinted from: Special Printing on Screen Printing
