What causes static electricity failure?

Static electricity can significantly impact screen printing despite its generally low current but extremely high voltage potential. The effects of static electricity include attraction, repulsion, conduction, and sudden discharge, all of which can disrupt printing. During printing, the motion and pressure applied by the squeegee rubber can cause both the squeegee and the screen mesh to become electrically charged. This charge can interfere with ink transfer, leading to issues like screen blockage or the glass being momentarily attracted to the screen as it exits the printing area.

The leading causes and effects of static electricity in screen printing on glass are as follows:

Electrically Charged Glass When Heated: Glass can easily become charged when exposed to heat during printing, which can disrupt the printing process.
Contamination of the Glass Surface: Static electricity can cause the glass surface to attract airborne ink particles or dust, making the surface dirty and impairing print quality.
Static Shocks to Operators: Contact with electrically charged objects or the sudden discharge of accumulated static electricity upon grounding can result in minor shocks. Although these electric shocks involve tiny currents and are not dangerous, they can cause discomfort and create a stressful work environment for operators.

How to prevent static electricity failure?

Adjust Environmental Conditions: Regulating the temperature and humidity can help dissipate static electricity. Maintaining an ambient temperature of around 20°C and a relative humidity of 60% is generally effective. Higher humidity allows static charges to dissipate more easily into the air.
Increase Air Humidity: Moist air can help carry away static electricity, reducing the risk of accumulation.
Lower the Mesh Distance: Reducing the distance between the screen and the substrate can minimize static buildup.
Reduce Printing Speed: Slowing down the printing speed can decrease the static generated during the process.
By managing these factors, the negative effects of static electricity on screen printing can be mitigated, ensuring smoother operations and higher-quality prints.

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