IntroductionThis document addresses the electrostatic challenges encountered with freshly injected plastic mouldings. It outlines the problems caused by electrostatic charges during various stages of the moulding process and proposes solutions using ionization systems.
Electrostatic Challenges- During Demoulding: Parts often stick to the mould or ejector due to electrostatic charges, leading to potential damage when the mould closes again. This issue is particularly prevalent with light, small parts made of insulating plastics.
- Handling System Removal: Grippers or suction cups used to remove parts can cause them to stick and drop uncontrollably if they have little weight.
- Post-Demoulding Ejection: Charged parts may stick to machine parts or collecting containers, causing blockages.
- On the Conveyor Belt: Parts may adhere to the belt due to charges, leading to continuous travel and eventual dropping.
- In the Collecting Container: Accumulated charges can create a strong electrostatic field, causing parts to stick to container walls and attract dust, leading to contamination.
Solutions Using Ionization Systems- Air Gates: Ionized air jets are used to neutralize charges. Air gates can be positioned above or beside the mould, along the conveyor belt, and at the collecting container to ensure complete discharge of parts.
- Installation Positions: Diagrams illustrate potential positions for air gates to effectively discharge parts at various stages, including above the mould, along the conveyor belt, and within the collecting container.
ConclusionElectrostatic issues in plastic moulding are multifaceted and persist from part creation to final use. The implementation of HAUG ionization systems with compressed air can effectively mitigate these challenges, ensuring smooth processing and reducing contamination risks.