In order to prevent the diffusion of bubbles during the silk-screen printing process, the following aspects can be taken into consideration:
1. Bubble prevention
Optimize the silicone formula:
Choose a silicone material with low bubble generation, or add an appropriate amount of defoaming agent to the silicone to reduce the generation of bubbles.
Ensure that the fluidity of the silicone is moderate to avoid bubble problems caused by excessive thickness or thinness.
Control the printing environment:
Keep the printing environment clean to avoid dust and impurities from mixing into the silicone.
Control the temperature and humidity of the printing environment within an appropriate range to reduce the generation of bubbles.
Correct operation:
Before printing, make sure that the silicone has been fully stirred and left to stand for a period of time to eliminate bubbles.
Use appropriate printing tools and scrapers to ensure that the silicone can be evenly and smoothly applied to the substrate.
Avoid applying excessive pressure during the printing process to avoid pressing bubbles into the silicone.
2. Bubble control
Timely detection and treatment:
During the printing process, regularly check the coating of the silicone to detect and handle bubbles in a timely manner.
For small bubbles that have already been generated, you can use tools such as squeegee or needles to gently puncture them to discharge the gas in the bubbles.
Adjust printing parameters:
According to the characteristics of silicone and the requirements of the substrate, adjust parameters such as printing speed, pressure and squeegee angle to reduce the generation and diffusion of bubbles.
Use auxiliary tools:
During the printing process, you can use tools such as vacuum pumps or suction devices to extract bubbles from the silicone to reduce the diffusion of bubbles.
3. Subsequent processing and inspection
Curing treatment:
After the silicone printing is completed, proper curing treatment is carried out to ensure that the silicone can be completely cured and reduce the residual bubbles.
Quality inspection:
Quality inspection of the printed products to ensure that the product surface is flat and free of defects such as bubbles.
Defective product processing:
For products with quality problems such as bubbles, they should be reworked or scrapped in time to avoid defective products from entering the market.
In summary, preventing the diffusion of bubbles in the process of silk-screen silicone printing requires multiple aspects such as bubble prevention, bubble control, and subsequent processing and inspection. By comprehensively applying these methods, the generation and diffusion rate of bubbles can be significantly reduced, and the printing quality and product qualification rate can be improved.