Adjusting the scraper pressure of the screen printing machine is an important step to ensure printing quality, and the adjustment method needs to be flexibly operated according to specific machine models and printing requirements. The following are general adjustment steps and precautions:

　　1、 Preparation work

　　1. Check the equipment: Ensure that the screen printing machine is in good condition, and all adjustment knobs and buttons are in their initial positions.

　　2. Material preparation: Prepare the required materials such as coatings, printing boards, and paper, and ensure that they meet the printing requirements.

　　3. Choose the appropriate scraper: Select the appropriate scraper according to the printing requirements and confirm its gap with the printing board.

　　2、 Adjust the scraper pressure

　　1. Manual adjustment:

　　2. Adjust the scraper position: Adjust the scraper to the highest position, then gradually lower the scraper position, and observe whether the paint on the printing board can be completely printed on the paper.

　　3. Adjust pressure: Use the knob or button on the screen printing machine to gradually increase the gap between the scraper and the printing board until a satisfactory printing effect is achieved. If the printing effect is still not good, you can increase the scraper pressure appropriately again.

　　4. Observation angle: Ensure that the inclination angle of the scraper is appropriate, usually around 30 degrees, to avoid poor printing results caused by angles that are too large or too small.

　　5. Automatic adjustment (if applicable):

　　Some advanced screen printing machines are equipped with the function of automatically adjusting the pressure of the scraper, which can automatically detect the accuracy of the printing plate and adjust the curvature of the scraper to achieve the best printing effect. When using the automatic adjustment function, follow the equipment manual for operation.

　　3、 Precautions

　　1. Keep the scraper clean: Ensure that the surface of the scraper is free of impurities and residues to ensure smooth flow of the coating.

　　2. Gradual adjustment: When adjusting the pressure of the scraper, it should be done gradually to avoid adjusting too much at once, which may cause the printing effect to lose control.

　　3. Multiple printing trials: After adjusting the scraper pressure, multiple printing trials should be conducted to observe whether the printing effect is stable, and adjustments should be made as needed.

　　4. Record data: During the adjustment process, the data and results of each adjustment should be recorded for future reference and optimization.

　　In summary, adjusting the scraper pressure of a screen printing machine is a process that requires careful and patient attention. Operators need to operate flexibly according to specific machine models and printing requirements, and follow the equipment manual and operating procedures.