Screen printing ink deployment notes (on)

In order to successfully perform screen printing, preparations for printing materials (inks), substrates, plates, etc. must be done. If the type of ink used is appropriate, the ink color, viscosity and thinner are appropriate; the size, type, quantity of the substrate, whether the surface needs to be processed; whether the printing machine parts are operating normally, the surface of the printing table is flat; the size of the printing plate is Accuracy, accuracy, and so on.

First, ink deployment

Before printing, the ink should have good application and printability, and if necessary, proper blending should be done.

1. Toning. Prior to ink distribution, the amount of ink consumed per color print should be calculated first, so that the amount of ink dispensed is appropriate. Especially for the two-fluid reaction type ink, the ink transfer amount should be calculated according to the curing speed and printing speed.

In order to obtain the correct color, the ink transfer should be performed under stable natural light, and it should not be observed by juxtaposing and judging from the illusion. When configuring the fresh ink, the dark ink should be added gradually, avoid adding too much at one time, and then remedy with a large amount of light ink. At the same time, the hue of the mixture should be reduced as much as possible. The more hue, the greater the gray scale.

In addition, attention should also be paid to the color change before and after drying. For example, on a light-colored substrate with a large amount of ink absorption, the dried ink is often light; the three-phase color difference between the wet state, the dry state, and the foaming state of the foamed ink is large; After the ceramic ink is fired, the hue changes; the white ink turns yellow after being heated. Such a rule of discoloration requires the printer to accumulate experience and samples in practice and make their own color standards.

The color deployment of screen printing ink (printing material) is a link that can not be ignored in the production process of silk screen printing. The basic principle of deployment is inseparable from the basic principles of additive coloration and subtractive coloration of colorants.

The three primary colors of the colorant are mixed in an equal amount of any two colors, and a certain color phase of the three primary colors of light can be generated. These three colors are called the inter-color (or second-time color) from the perspective of color, such as the green color formed by the mixture of yellow and cyan, which is the inter-color. The hue produced by the mixture of inter and inter-color is called the polychromatic (or third-time color). The mixed color and complex color of the three primary inks are shown in Figure 3-60.

Figure 3-60 Inter-color, complex color of three primary inks

(to be continued)