Selecting Tips for Screen Frames and Stretching in Silk Screen Printing

one. Frame material selection

General use of ly12, lf2 and other hard alloy aluminum square tube, size selection width 20mm, thickness 20mm, four corners by argon arc welding or riveting processing. The metal frame has high precision and dimensional stability.

two. Screen material choice

At present, nylon mesh and polyester mesh are the most used. Nylon mesh is poor in heat resistance, easily deformed by heat after being heated, making the tension non-uniform, affecting the quality of screen printing. Bonding stretch net or screen stencil production should not be high-temperature baking. Polyester mesh has good heat resistance, dimensional stability, 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, screens with a higher number of meshes, smaller wire diameters, and smaller meshes should be selected. The color of the screens should be yellow or brownish to prevent vignetting.

three. Stretch net

Pneumatic stretching machines are the best choices. The quality requirements for stretch nets are as follows:

1. Stretch net tension is suitable and uniform

(1) When using a pneumatic stretch net to reach the tension requirement, it must be allowed to stand for 3-6 hours and then stretch the net;

(2) Stretch a good network for a minimum of 24 hours or more, especially for large cargo or machine-printed nets to ensure equal stress at all points and prevent deformation. The higher the screen size, the longer the screen is required to be placed. It is usually 2-3 days. After placement, the tension of the screen is stable, and the stress of the name points is equal, so as to ensure that the screen is not deformed and is not easily damaged.

2. Latitude and longitude meshes remain vertical

3. Prevents relaxation

four. Screen stencil plate making process

At present, the most commonly used method is the direct method for making screen templates. In this production process, attention should be paid to the proper thickness of the sizing coating and uniform sizing. Strict control of drying, exposure, and development should be used to obtain high-quality screen templates.