During the high-speed operation of central impression ci Flexo press, static electricity often becomes a hidden yet highly damaging issue. It accumulates silently and can cause various quality defects, such as the attraction of dust or hair to the substrate, resulting in dirty prints. It may also lead to ink splattering, uneven transfer, missing dots, or trailing lines (often referred to as "whiskering"). Additionally, it can cause issues like misaligned winding and film blocking, severely impacting production efficiency and product quality. Therefore, effectively managing static electricity has become crucial for ensuring high-quality printing.
Where Does Static Electricity Come From?
In flexographic printing, static electricity primarily originates from multiple stages: for example, polymer films (such as BOPP and PE) or paper frequently frictionally contact and separate from roller surfaces during unwinding, multiple impressions, and winding. Improper control of ambient temperature and humidity, especially under low-temperature and dry conditions, further facilitates the accumulation of static electricity. Coupled with the continuous high-speed operation of the equipment, the generation and aggregation of charges are exacerbated.
Where Does Static Electricity Come From?
In flexographic printing, static electricity primarily originates from multiple stages: for example, polymer films (such as BOPP and PE) or paper frequently frictionally contact and separate from roller surfaces during unwinding, multiple impressions, and winding. Improper control of ambient temperature and humidity, especially under low-temperature and dry conditions, further facilitates the accumulation of static electricity. Coupled with the continuous high-speed operation of the equipment, the generation and aggregation of charges are exacerbated.
Systematic Electrostatic Control Solutions
1.Precise Environmental Control: Maintaining a stable and suitable workshop environment is the foundation for optimal performance of ci Flexo press. Keep humidity within the range of 55%–65% RH. Appropriate humidity enhances air conductivity, accelerating the natural dissipation of static electricity. Advanced industrial humidification/dehumidification systems should be installed to achieve constant temperature and humidity.
Humidity Control
Static Eliminator
2.Active Static Elimination: Install Static Eliminators
This is the most direct and core solution. Precisely install static eliminators at key positions:
●Unwinding Unit: Neutralize the substrate before it enters the printing section to prevent static charges from being carried forward.
●Between Each Printing Unit: Eliminate charges generated from the previous unit after each impression and before the next overprinting to avoid ink splattering and misregistration on the CI flexographic printing machine.
● Before the Rewinding Unit: Ensure the material is in a neutral state during rewinding to prevent misalignment or blocking.
3.Material and Process Optimization:
● Material Selection: Choose substrates with anti-static properties or those surface-treated for anti-static performance, or substrates with relatively good conductivity that match the flexography printing process.
●Grounding System: Ensure the ci flexo press has a comprehensive and reliable grounding system. All metal rollers and equipment frames should be properly grounded to provide an effective path for static discharge.
4.Routine Maintenance and Monitoring: Keep guide rollers and bearings clean and operating smoothly to avoid abnormal friction-induced static electricity.
Conclusion
Electrostatic control for ci flexo rinting press is a systematic project that cannot be completely resolved by a single method. It requires a comprehensive approach across four levels: environmental control, active elimination, material selection, and equipment maintenance, to build a multi-layered protection system. Tackling static electricity scientifically is key to boosting print quality and slashing waste. This approach minimizes downtime and ensures highly efficient, stable, and high-quality production.
Post time: Sep-03-2025