laser fume extraction

Many processes where dust and fume extraction is necessary take place in an environment where electrostatic discharge can cause problems.

The actual process of air passing through an extraction system can create a static charge. This charge can damage sensitive electronic components, resulting in expensive reject rates. In applications where powder or dust is mixed with the airflow, for example in the chemical handling and pharmaceutical industries, a build-up of static electricity can pose a potential explosion hazard.

It is an interesting discussion point because in laser fume systems electrostatic fibres have been tested in a range of filter media for improving performance.  The theory that particles would ‘stick’ to the filters allowing a more open matrix of fibers was proved in the end to adversely affect the efficiency of a laser fume extraction system:  With particles traveling through to the ‘clean air’ stream when dislodge through vibration.  The issue has now gone full circle from a possible advance in technology to a proven nuisance in particular laser processes!