Gases, vapours, solid or liquid particles, substances that are unhealthy, or dangerous for the health of operators are suppressed. They are caputed as and when they are produced, as close as possible their emission source and as efficiently as possible, considering the nature, characteristics and flow rate of pollutants as well as the movements of the air.
Dust extraction systems are employed in a wide range of applications in the corrugated board industry ranging from board cleaning to vacuum transfer belt dust control on high quality printers, some of which involve quite specialised designs.
All our dust extraction systems comply with the relevant legislation including LEV, COSHH and ATEX, where the dust has an explosion risk. Delta NEU dust extraction filters are available certified with explosion relief protection for location in either an ATEX designated zone or a safe, non-ATEX area.
Many of the modern high-speed high-quality conversion machines today use vacuum transfer technology to move the board through the print and cutting sections of the machine. Unlike mechanical nip rolls, this technology ensures the surface of the board is unmarked by the mechanical gripping rolls. However, the process requires an amount of vacuum generated airflow to hold the board in register using vacuum chambers and rollers as it passes from section to section.
The vacuum fans for this duty are carefully selected by the conversion machine supplier and any subsequent interface with exhaust ducting or dust filtration must ensure no impact on the performance of the machine.
The production of corrugated board products typically produces small dust particles during the various cutting operations, either in the manufacture of the board itself or in the conversion to the finished customer product. This may lead to small dust deposits on the board, which could affect the print quality or dust release in the cutting section in the machine itself, and this dust will be entrained into the vacuum extraction.
When in minute concentrations, this can be simply exhausted from the factory to ensure no health risk to the production personnel, however, from the points where greater concentrations occur, it may need to be filtered. The Jetline filter range has proven itself over many years as an ideal filter for the application and may be combined with a dust briquette unit for a safe and easy disposal of the collected dust.
Although corrugated and carton dust is combustible and in a dust cloud of sufficient concentration, could constitute an explosion risk, the amount of dust in this type of system is at an extremely low level, well below the risk limits. As such, by careful design, it is possible to install the Jetline filter inside the building, without risk, and fully recycle the air either to prevent heat loss, or in middle eastern factories which are often air conditioned, prevent cooler factory air loss.
