The use of gravity feed is one example of a simple, yet highly effective method of powder transfer.
Using a hoist, it is possible to raise one container above another and discharge directly or indirectly from the outlet of ‘container A’ to the inlet of ‘container B’. This removes the need for manual handling, whilst creating a dust-free, fully-contained method for transferring powder. It’s flexibility, simplicity and reliability makes gravity feeding an excellent method of powder transfer, which can be utilised across a wide range of applications.
However, it is crucial to note that no matter how well designed any item of powder handling equipment is, the weakest link in the gravity transfer process is the interface.
Fortunately, there are a number of ways of ensuring the transfer is dust-tight, the most common being silicone dust caps and flexible sleeves.
Flexible connections – Offering a simple method of achieving contained transfer
Hanningfield’s Uni-Dust silicone dust caps offer a highly effective approach to sealing an outlet tube to an inlet aperture for example IBC to IBC. Flexible sleeves have a similar application but tend to be more positive and require more assembly. Both systems provide a good dust tight solution and are ideal where height adjustment or some misalignment is required.
Silicone dust caps and sleeves are also a low cost and effective method of containing powders during process to process transfer. Another although less popular containment method used in gravity transfer is an inflatable seal. Inflatable seals do provide an effective sealing method but are high cost and prone to damage making regular replacement an issue. Early consideration of this vital element in the process should be made at the initial design stage of any successful powder handling system.
Although generally considered dust-tight and safe, for certain processes there may be concerns about the OEL (operator exposure levels) of flexible connectors. In these instances, it may be advisable to consider the use of a hygienic valve, to ensure measurable containment is maintained during gravity transfer.
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If you would like to speak to one of our experts regarding our range dust-free transfer solutions, or you would like a quote for one of our products, send us a message using our Contact Form or call us on +44 (0)1702 549 777.
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