When replacing different printing patterns or products, the automatic screen printing machine needs to perform the following adjustment steps:

1、 Pattern preparation and parameter setting

Firstly, it is necessary to input the new printed pattern into the control system of the automatic screen printing machine. This may involve converting design files into a format that machines can recognize, such as using professional graphics software to convert pattern files into specific vector or bitmap formats. Then, in the screen printing machine's operation interface, adjust the size, resolution and other parameters of the pattern to ensure that the pattern can be accurately printed on the product according to the actual needs. For example, if the size of the new pattern is smaller, the printing range and screen tension range need to be correspondingly reduced; If higher resolution is required, it may be necessary to adjust the speed and pressure of the scraper to ensure even ink distribution.

2、 Wire mesh replacement and calibration

According to the details and color requirements of the new pattern, it may be necessary to replace the screen. Choose a screen with the appropriate mesh size, the higher the mesh size, the finer the pattern can be printed. After installing the new wire mesh, it is necessary to calibrate the wire mesh. This includes adjusting the flatness of the screen, ensuring that the screen is parallel to the printing platform, and the error is generally controlled within a very small range, usually around ± 0.1mm. The machine's built-in fine-tuning device can be used to adjust the height of the four corners of the screen, so that the screen can evenly contact the printed product.

3、 Scraper adjustment

The angle, pressure, and speed of the scraper have a critical impact on printing quality. For different patterns and products, it is necessary to readjust the scraper. If the pattern lines are thin, the angle of the scraper is usually adjusted smaller, such as from 70 ° to around 60 °, which can better allow the scraper to pass the ink through the fine pores of the screen. The pressure of the scraper also needs to be adjusted according to the complexity of the pattern and the characteristics of the ink. For large areas of solid color patterns, increasing pressure appropriately can ensure sufficient ink transfer; For fine patterns, it is necessary to reduce pressure to prevent pattern deformation. The scraper speed should also be adapted to the pattern, and the speed for fine patterns should be slower. For simple patterns, the speed can be appropriately increased, and the speed range may be adjusted from 1-5 meters per minute.

4、 Positioning and Product Fixed Adjustment

Finally, the positioning device of the product needs to be adjusted. Replace or adjust the positioning fixture according to the new product shape and size to ensure that the product can be accurately placed in the printing position. At the same time, reset the positioning parameters of the product in the control system to ensure that the pattern can be accurately printed on the designated position of the product. High precision positioning can be achieved through visual positioning systems or mechanical positioning pins, and the positioning accuracy can usually reach ± 0.5mm.