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Brief Introduction for Screen printing 05/04/2012

Screen printing method Transfer the ink to the substrates through the mesh of the graphic by scraper extrusion and to form a graphic as the original. Screen printing has the advantages of simple equipment, convenient operation and printing, low cost, and strong adaptability.

Main characteristics of screen printing

1. Screen printing can use various types of ink.

2. Screen printing layout is soft and has a certain degree of flexibility. It is suitable for printing on the soft goods such as paper and cloth. Screen printing is also suitable for the printing on hard goods.

3. The imprint force of screen printing is small. Because of its small imprint force, it is suitable for the printing on fragile goods.

4. The ink layer is thick and has a strong covering force.

5. It is not affected by the substrate surface shape and size restrictions.

Operating skills of screen printing

1. Selection of plate-making film

Make the film like offset the printing plate in order to get screen printing products with rich layers. Select the 100~133line/inch dot output as the high number of lines is not conducive to the reproduction of the low level. If the circular outlets were chosen, image tone curve adjustment is necessary because the screen printing dots reproduction curve decreases below 20% and increases at 70%. In order to guarantee the accuracy of the late overprint, the sulfuric acid paper negatives should be avoided as far as possible even in the line screen printing.

2. Selection of screen

Yellow plain weave polyester mesh with high mesh size is a necessary condition for high-precision screen printing. Yellow is to reduce the diffuse reflection of exposure light. The plain woven can form a thin screen which can facilitate the reproduction of the high and low levels. There are a variety of wire diameters to choose for the same mesh screen and the one cannot be broken easily should be chosen.

3. Stretching

The use of large format mechanical stretching machine can obtain larger tension. The tension of the same set of screen plate should be consistent. Oblique stretching helps to reduce the incomplete of the dot and make the small text and line perfect. Aluminum or steel screen frame should be chosen as the wooden frame is easy to be deformed after immersion in water.

4. Screen plate-making

The quality of the screen plate is the foundation of accurate overprint, stable reproduction of the outlets and good tone level replication. Check the plying-up situation between the positive film emulsion surface and the screen printing surface. Eliminate the moire between them with an angle rotation and then fixed with tape.