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Health & Safety including Dust Control Dustcheck helps future proof business

Stoke-on-Trent based Norcros Adhesives, a leading UK manufacturer and supplier of adhesives, grouts, surface preparation and tile aftercare products, is part of the Norcros Group of companies. Its state of the art fully automated, PLC controlled facility in Stoke-on-Trent was installed in 2005. Dustcheck was approached when it became apparent that its existing dust extraction and filtration equipment was no longer world class.

Opportunities were identified to improve working conditions, maximise product yield and reduce the cost of disposal and maintenance

Three new systems were recommended and installed by Dustcheck:

1. General dust extraction system within production area – including improved cleaning system

2. External extraction for bulk silos with independent vent filters 3. Independent vent filter for internal bulk storage silo A new centralised dust extraction system serving an existing production facility was required to include dust collection from mixers, weigh hoppers and filling machines and also contains additional capacity for future expansion up to 1,286m3/hr. The system has 24 individual extraction points which collectively generate an airflow of approximately 14,975m3/hr. The new dust extraction system replaces a number of systems currently using 'mechanical shake' cleaning technology

– a method that utilises offline cleaning more suited to applications handling coarse dusts and intermittent production lines that are not permanently in use. In the past this has meant that production has had to be essentially shut down before cleaning can take place.

The new system uses an on-line ‘rotating wing’ reverse jet cleaning technology, whereby a quick burst of compressed air is used to close a damper plate effectively taking the cartridge off- line during cleaning. The residual air drives a rotating ‘wing’ which forces air uniformly through the filter in the opposite direction to the dusty air stream. The cleaning air breaks up dust build up on the filter, taking place while the system is still running, thereby maintaining steady differential pressures across the filter and ensuring that extraction rates are maintained at all times. This leads to longer filter life, lower maintenance and system downtime and lower ‘whole of life’ running costs. This efficient method of cleaning ensures longer filter life, leading to a reduction in house-keeping, maintenance, repair and lower ‘whole of life’ costs. Also, as the filters are kept cleaner the risk of nuisance dust egress such as silica etc., is also significantly reduced.

Another key replacement was the duct pipework providing more efficient extraction.

The new system offers reduced running costs, cleaner environment, safer environment and reduced cleaning hours.

42 Solids & Bulk Handling • October 2011

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