3. Stretch net stretch net is a link that can not be ignored, to produce high-precision print graphics first requires the stretch net to meet the quality requirements, it is best to use pneumatic stretch net machine, stretch net quality requirements are as follows.
1 stretch tension is appropriate, uniform tension is not the greater the better, the tension is too large, beyond the elastic limit of the material, the screen will lose elasticity, brittle or even broken. The tension is not enough for the screen to be soft and lacks resilience. Should be in accordance with the rated tension, and then give consideration to the operating conditions, so that the entire screen surface tension even.
2 The latitude and longitude of the wire mesh with vertical and horizontal meshes should be kept as perpendicular as possible to the edge of the mesh frame. When the mesh is stretched, the wire is pulled and the force is consistent with the wire direction; the second is the wire held by the mesh clamp. The net can move laterally when stretched.
3 Prevention of relaxation In order to reduce the tension of the network over time, the screen will become loose or more loose, resulting in a drop in tension, should continue to pull the net and repeatedly stretch the stretching method, so that part of the tension relaxation in the fixed network Completed before.
4. Screen stencil plate making process is currently the most used is the direct method of making screen stencil, in this production process, pay attention to the sizing coating thickness is appropriate, strictly control the drying, exposure, development and other aspects, in order to get high quality Screen stencil.
Fourth, control the various factors in the screen printing process, improve the accuracy of screen printing In the screen printing graphics processing process, the first requirement is good printing material performance, followed by strict control of printing equipment, tooling, scraper, network distance, scraping pressure And other process factors.
1. Ink must have the following properties:
Good chemical stability;
Drying speed is suitable;
Good adhesion to copper-clad plates;
Suitable viscosity, good thixotropy, suitable color;
Good anti-printing force
Easy to dry.
2. Equipment tooling The screen printing machine with high printing precision can eliminate many artificial instability factors. The positioning tooling can directly use the machine table surface to adjust the positioning pin positioning (positioning hole can be controlled by CNC drilling and drilling).
3. Other process factors Scraper material, scraper width, hardness, squeegee angle, edge state and net distance, squeegee pressure, etc. are all very important, should choose polyester rubber scraper. Scraper width is appropriate, too wide and easy to cause distortion of the graphics, scraper hardness in the majority of Shore A60 ~ 80 range, the squeegee angle is 20 ~ 30 °, the edge should always be kept flat sharp. The net distance is generally 2~4mm and the screen is parallel to the table. The pressure of the squeegee is suitable for printing clear graphics.
In summary, the main factors influencing the line pattern accuracy include the printing material, the hardness of the squeegee, the state of the cutting edge, the squeegee pressure and the angle, and the screen printing equipment, tooling, mesh distance, and the width of the squeegee. Major factors such as the position accuracy of printed graphics are affected. High-quality screen templates are essential to improve the printing accuracy.
Discussion on the Improvement of Screen Printing Precision of Printed Board (2)
April 21 05:07:53, 2024
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