Use of EIESD Ionizing Bars in Plastic Injection Molding and Film Production

Use of EIESD Ionizing Bars in Plastic Injection Molding and Film Production

1. Introduction

Static electricity is a major issue in plastics processing: it can cause sticking, dust attraction, and material handling problems.

Ionizing bars neutralize charges on plastic parts, sheets, and films, improving production efficiency and product quality.

2. Typical Applications

Application Purpose Placement / Notes

Plastic injection molding Neutralize charge on molded parts during ejection Mount bar near the mold ejector or conveyor, 20–50 cm away; air-assisted bars help on hot, fast-moving parts

Film extrusion lines Prevent static between layers, rolls, or sheets Place bars across rollers or extrusion die exit; ensure coverage of entire sheet width

Film winding / slitting Reduce sticking and dust attraction Bars installed before winding reels or slitting stations, parallel to sheet direction

Thermoforming / sheet handling Eliminate static before forming Mount bars over sheet conveyors; verify uniform ionization along the sheet

3. Installation Guidelines

Distance to target:

20–50 cm depending on bar type and speed of moving film or part

Orientation:

Parallel to film or conveyor for uniform coverage

Airflow:

Air-assisted bars improve ion transport for hot, fast-moving materials

Coverage:

Ensure full width of film or sheet is covered; use multiple bars for wide webs

Grounding:

Proper grounding of machinery, rollers, and the ionizer ensures ion balance

4. Performance Verification

Static decay time: ±1,000 V to ±100 V should meet manufacturer’s specification (typically 2–5 s for DC bars)

Ion balance: Residual voltage should remain within ±10–50 V

Uniformity: Test across full sheet width to ensure even static neutralization

5. Maintenance Tips

Clean emitter pins frequently to maintain ion output

Inspect for corrosion or wear on pins due to high temperatures or dust

Verify airflow in air-assisted systems, ensuring no obstructions

Check HV module periodically for voltage stability

6. Benefits

Benefit Impact on Plastic/Film Production

Static elimination Prevents sheet sticking, rolling, or clinging

Dust and particle control Improves cleanliness of film and molded parts

Faster decay Supports high-speed extrusion or injection lines

Uniform ionization Reduces product defects and improves downstream processing

7. Summary Table

Parameter Recommendation / Notes

Bar type DC, pulsed DC, or air-assisted for fast-moving or hot materials

Distance to target 20–50 cm; closer for air-assisted bars

Orientation Parallel to sheet or conveyor

Airflow Even across sheet width; improves ion transport

Ion balance ±10–50 V residual voltage

Decay time 2–5 s for ±1,000 V to ±100 V

Maintenance Clean pins, inspect HV module, check airflow and grounding

Key Takeaways:

In plastics and film production, ionizing bars are installed above molds, extrusion lines, rollers, and conveyors to neutralize static charges.

Proper distance, orientation, airflow, and grounding ensure uniform static elimination.

Regular decay time and ion balance checks maintain product quality, reduce dust, and prevent sheet sticking.