What Is Edge Sealing and How Can It Help Leakage in My Filter Press Operation?

Friday, August 11, 2017
Filter Press Operation

Edge sealing at our Portsmouth, NH filter cloth manufacturing operations plays an integral role in preventing potential edge leakage in filter press operations like yours. Contact Micronics for expert filter cloth and filter press expertise and answers to all your filtration questions.

Customers are frequently talking to us about helping them ensure a highly-efficient and leak-free filter press operation. So, let’s explore possible contributors to a “leaky” filter press operation and some of the remedies.

There are many factors, of course, that contribute to a leaky vs. leak-free filter press operation. Filter cloths – by design – are constructed of permeable materials. All permeable materials are subject to wicking, which is defined as the movement of moisture within a fabric by capillary action. During the filtration process, liquid id being forced through the filter cloths under pressure, greatly increasing the chances of edge leakage due to wicking.

The filtration characteristics of specific slurries will affect their filtration efficiencies. Factors such as having too much back pressure may result in leaking around the edges of your filter plates. Other factors such as poorly-designed filtrate discharge piping, higher than recommended pumping volumes, and selecting filter cloth that is not optimized for your application may all cause or contribute to the problem of a leaky filter press operation.

Did you know that a latex coating may be applied to the edges of a non-gasketed filter cloth to help prevent potential wicking of the filtrate? At Micronics’ state-of-the-art filter cloth manufacturing operations in Portsmouth, NH, synthetic rubber sealant edge treatments are applied to our filter cloth by highly experienced operators. This step helps to prevent premature cloth failure at critical areas such as the cloth edges.

Wicking of the filtrate may occur if filter cake sticks to the cloth, especially around the edges, potentially resulting in plate distortion and misalignment in closing the plate pack, and potential leaking in subsequent cycles. Applying a latex edge sealant creates a coating of the fabric at the joints of the filter plate, acting to prevent leaks. Use of an automatic cloth washing system is also very helpful in ensuring that filter cake doesn’t remain on the cloth between cycles. Read a recent blog post on how automatic cloth washing can help with optimizing filter cloth life and cycle time here.

Contact us to learn more about our filter cloth and filter press manufacturing operations and how we work hard to ensure that you have all the components in place for a highly efficient and leak-free dewatering operation. Benefit from Micronics’ years of engineered filtration expertise. We are committed to your success.