The anti-static design of Potatoes Chip Auger Conveyor needs to focus on material selection, structural optimization, grounding system and operation control to avoid the risk of potato chips sticking and dust explosion caused by static electricity, while meeting food hygiene standards:
1. Priority selection of conductive materials
Main body material: The spiral shaft, blades and trough are made of stainless steel 304 or 316L (surface resistivity ≤ 10⁶Ω ), replacing the traditional carbon steel material, and eliminating static electricity accumulation through the conductive metal body.
Non-metallic parts: Bearing seals, dust covers and other non-metallic parts should be made of anti-static engineering plastics (such as PEEK with added carbon nanotubes , with a surface resistivity of 10⁴-10⁶Ω ) or conductive rubber to avoid friction electrification.
2. Structural design reduces friction static electricity
Spiral blade spacing: Increase the blade spacing appropriately (10%-15% larger than conventional designs) to reduce the frequency of squeezing between potato chips and blades and reduce contact electrification. For example, when conveying 2mm thick potato chips, the spacing can be adjusted from 80mm to 90mm.
Surface roughness control: The blades and the inner wall of the trough are polished to Ra≤0.8μm to reduce material retention and friction. The corners are made of arc transition with R≥5mm to avoid static discharge.
3. Complete grounding and electrostatic discharge system
Multi-point grounding: The screw conveyor body is connected to the workshop grounding grid (grounding resistance ≤ 4Ω) through a copper braided belt, and a grounding point is set every 2 meters; the motor, reducer and other auxiliary equipment are grounded independently to avoid electrostatic discharge caused by potential difference.
Static eliminator: Ion wind bars are installed at the entrance and exit of the trough to neutralize static electricity on the surface of the material by releasing positive and negative ions, so that the surface potential of the potato chips is ≤±100V (safety threshold in the food industry).
4. Coordinated control of operating parameters and environment
Speed optimization: Use frequency conversion to control the screw speed to ≤20rpm to reduce friction static electricity generated by material ejection. For example, when the speed drops from 25rpm to 20rpm, the static electricity can be reduced by 30%.
Humidity adjustment: Cooperate with the workshop environment control system to maintain the air humidity in the conveying process at 55%-65% RH, use moisture conduction to reduce the surface resistivity of the material and enhance the static dissipation ability.
Through the above design, the static electricity accumulation during the potato chip conveying process can be controlled within a safe range, while avoiding the migration of metal ions to contaminate food, meeting the anti-static and hygiene requirements of FDA, GB 14881 and other standards for food contact materials.
If you want to know the key points of anti-static design of Potatoes Chip Auger Conveyor , you can contact Changrong 's professional technicians, and we will do our best to help you!