How to Make The Screen Printing Machine Improve The Printing Accuracy?

The accuracy of the printed pattern not only depends on the accuracy limit of the screen printer itself, but also has a great relationship with the production of the screen printing screen. The smaller the gap between the printed patterns, the higher the requirements for the screen printing screen. In order to achieve the ideal screen printing machine accuracy, it is necessary to understand some small details of screen printing. The production of the screen screen involves several factors such as the screen frame, the screen and the stretched screen, the plate making and the photosensitive material.

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1. Selection of frame material

Generally, hard alloy aluminum square tube profiles such as LY12 and LF2 are used, and the four corners are processed by argon arc welding or riveting. The metal frame has high precision and stable dimensions.

2. Selection of screen material

At present, nylon mesh and polyester mesh are the most commonly used. Nylon wire mesh has poor heat resistance, and is easy to produce thermoplastic deformation after being heated, which makes the tension uneven and affects the quality of screen printing. It is not suitable for high temperature baking for the production of bonded stretch screens or screen templates. Polyester mesh has good heat resistance, stable dimensions, and the pattern does not change greatly due to changes in temperature and humidity.

In order to ensure the accuracy of screen printing graphics, it is best to use monofilament polyester screen. At the same time, you should choose a screen with a higher mesh number, a finer diameter, and a smaller mesh. The color of the screen should be yellow or brown to prevent vignetting.

3. Stretch the net

Stretching is a link that cannot be ignored. To produce high-precision printed graphics, the stretched net must first meet the quality requirements. It is best to use a pneumatic stretcher. The quality requirements of the stretched net are as follows.

①The tension of the stretched net is appropriate and even

It is not that the greater the tension, the better. If the tension exceeds the elastic limit of the material, the wire mesh will lose its elasticity, become brittle or even break. Insufficient tension, the screen is soft and lacks resilience. Should be in accordance with the rated tension, and then consider the operating conditions, so that the tension on the entire screen is uniform.

②Keep the warp and weft meshes vertical

The warp and weft of the stretched screen should be as vertical as possible to the edge of the screen frame. When stretching the screen, one is to draw the screen, that is, the force is consistent with the direction of the wire; the other is that the screen held by the net clamp can be stretched horizontally. move.

③Prevent slack

In order to reduce the tension of the stretched net over time, the screen will become loose or the more you use it, resulting in a drop in tension. The method of continuous stretching and repeated tensioning of the net should be used to relax a part of the tension before the fixed net.

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