Static Neutralization Equipment
- Types of Static Electricity Generation
- Static Electricity
- Countermeasures against Static Electricity
|Prevents static electricity from being generated.
- Proper selection of materials that come into contact with each other (Utilizing the triboelectric series)
- Reduction of the contact area
- Generation of static electricity increases as the contact area increases. Equipment designs with less contact area are required.
- Reduction in the frequency with which objects come into contact with each other
- Static electricity accumulates when objects come into contact with each other repeatedly. Reduce the frequency with which objects come into contact with each other to reduce the generation of static electricity.
- Control of capacitance
- Static electricity voltage fluctuates with capacitance. Capacitance needs to be controlled to prevent static electricity from increasing unnecessarily.
Static electricity voltage and capacitance
- » Static electricity voltage
Static electricity voltage can be calculated using the formula below.
Voltage (V) = Quantity of Electric Charge (Q) / Capacitance (C)When the quantity of electric charge is constant, the voltage fluctuates with capacitance.
Example: When capacitance decreases, voltage increases.
- » Capacitance (C)
The capacity to store static electricity between two objects. The capacitance between flat plates increases in proportion
to the area (S) and decreases when the distance (d) between the flat plates becomes larger.
Example: The static electricity voltage of a workpiece on the table increases when the workpiece is lifted with a lifter because the capacitance becomes smaller./dd>
|Prevent objects from being charged with static electricity.
Even if static electricity is generated, prevent objects from being charged to the extent that problems may result. Appropriate
measures need to be taken, depending on the applications.
- 1. Grounding
- Grounding is a fundamental countermeasure against static electric. However, grounding is sometimes not complete due to insulation from lubricating oils, and that grounding is not deep enough in the ground, therefore, it is necessary to confirm the grounding.
- 2. Humidity control
Humidity is controlled by humidifiers and such.
Caution: Humidifiers may not be effective for devices that obtain a high temperature.
- 3.Conductive products
- Caution: Conductive products cannot discharge static electricity without grounding.
- 4. Removing static electricity with ionizers, etc.
- » Difference in materials
Conductive materials can discharge static electricity immediately with grounding. When surface treatments such as anodization and the like are applied, conductive materials will become insulated and grounding will be ineffective.
Insulated materials cannot discharge static electricity even if they are grounded. To discharge static electricity, switch to using conductive materials, use humidity control or a surface active agent, or install an ionizers, etc.
- » Electrostatic features of conductive and insulated materials