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Direct Filtration works with customers to identify the best type of filter media for a wide range of applications, including grinding coolant filtration. Grant Tyrer, Direct Filtration's Product Manager, offers his expert opinion on how manufacturers undertaking grinding applications could achieve a variety of business benefits by simply switching to a different type of filter media:

"The swarf and sludge produced in grinding will contain metal fragments from the material being machined, as well as particles from the grinding wheel, and general dirt and debris.

"Coolant containing swarf can easily pool on the surface of the filter media if the flatbed system isn’t loaded with a suitable media for that particular coolant. This can result in bypass and tearing, meaning the machine tool will need to be stopped and cleaned more regularly, which can be time-consuming for the machine operator.

“Viscose media is widely used for filtering coolant used in grinding machines, but it’s not always the most effective. The type of coolant varies in viscosity meaning that some of our stronger/coarser grade materials can often be more suitable as they have greater fluid penetration characteristics letting the coolant through more easily than finer grade media.

“A number of our customers who have switched to a non-woven filter roll with a higher tensile strength have reported far less production down-time, and increased coolant life meaning they’ve saved money by reducing the frequency of waste disposal and coolant purchase.

"Whilst tearing can be a frustrating issue, a more harmful occurrence is filter bypass. This happens when the contaminated coolant cannot penetrate the filter media. Fluid will always take the path of least resistance and can at times simply pass over the sides of the filter media and into the coolant tank. This unfiltered coolant is then re-used in the machine tool which can impair the quality of both the tool and the components being produced and impact on the surface finish.

“Even the smaller particles can cause an issue. Quite often a flatbed filter media isn’t enough to remove particles invisible to the naked eye. In this instance, adding a downstream polishing filter to the filtration system may be all that’s needed. We come across this problem quite frequently, but find that customers don’t always realise that we can offer a solution to this issue.”

This short CGI film explains more about the importance of effective process fluid filtration. Call the Direct Filtration team on 01952 209999 to arrange a FREE process improvement review.

Direct Filtration is an operating division of Filtermist International. Filtermist and its subsidiary companies Multi Fan Systems and Dustcheck Ltd offer a wide range of products and services to help ensure people are protected from exposure to hazardous substances in workshops where grinding applications are taking place. Find out more by visiting Filtermist's UK website.