Options for Filter Cloth Attachment to Filter Plates
Filter cloths are the foundation to the solid/liquid separation process. It is the filter cloths that allow a filter cake to build up, and the the filter cake itself that ultimately does most of the dewatering. Therefore, it is imperative that the filter cloths are fitting correctly to the filter plates for the best filtration performance from the filter press.
Below we discuss the methods most commonly used for attaching filter cloths to each type of filter plate.
Attaching Filter Cloths to CGR (Gasketed) Filter Plates
When the prevention of leakage is paramount, gasketed filter plates and cloths are preferred over non-gasketed. However, this can be at the expense of speed of installation. Gasketed filter cloths are manufactured with a rope sewn into the outer edge. This enables the cloths to be pounded into the grooves of the filter plate, which provides for a nearly water-tight fit.
However, this process can take some time, and usually involves a deadblow hammer and polypropylene installation wedge. To help speed up the process, M.W. Watermark™ offers a palm-sized pneumatic air hammer.
Click the video link below for a CGR cloth installation demonstration.
Video: How to Install a Gasketed Filter Cloth
M.W. Watermark also offers a complete CGR Filter Press Service Tool Kit. This handy tool bag provides everything you need for installing and servicing gasketed filter plates and cloths, and also includes the lighweight air hammer.
Attaching Filter Cloths to NG (Non-Gasketed) Filter Plates
When the ability to change filter cloths quickly is critical, and a small amount of leakage is acceptable, then non-gasketed filter plates and cloths are generally preferred over gasketed.
The faster cloth installation time can be attributed to the fact that zip ties are used to pull the edges of the cloth together around the filter plate. Any excess zip tie length can simply be clipped. These plastic ties can also be quickly clipped off when it’s time to remove and change out the cloth.
Non-gasketed filter cloths are also held in place using cloth dogs, which are plastic pegs that insert into small openings in the top of the filter plate. Grommets that are sewn into the edge of the cloth are quickly secured to each cloth dog using a rubber washer, effectively adhering the top of the cloth to the plate.
Although it’s difficult to completely eliminate leaks when using non-gasketed filter cloths, there are some tried and true methods for improving the sealing.
For example, latex can be applied to the edging of the cloths, which can help reduce wicking. Hook and loop fasteners can also be added during the cloth manufacturing process, which can improve the fit when attached to a filter plate. This more exacting fit can also help reduce leakage by keeping the cloth aligned correctly.
The use of hook and loop material can also aid in the speed of cloth changes, and eliminates the chances of small pieces of plastic (zip tie clippings, stray cloth dogs/washers) being introduced into the process. This can be especially important in applications involving chemical production.
Click on the video below for a NG cloth installation walk-through.
Video: How to Install Non-Gasketed Filter Cloths
Download our Aftermarket Accessories Sheet to see our full selection of ancillary products.
Custom Filter Press Cloths Manufactured In-House
M.W. Watermark manufactures custom filter cloths in-house to fit the exact dimensions of most filter press plates.
This is accomplished by utilizing laser cutting tables and our experienced cloth sewing staff.
Contact Us Today
Contact our Sales and Service Team today to learn more.
Also, be sure to ask about our Filter Cloth Installation Service.
About M.W. Watermark
M.W. WATERMARK wants to make a difference. We are passionate about the world’s water. We are innovative, focused on customer service and always try to exceed expectations. We are an environmentally conscious company with people who are energized, encouraged and inspired to make a difference on our planet by helping to keep our shared, finite water supply clean and usable for generations to come. We build amazing, custom water and wastewater treatment equipment. Together, we can make a difference.
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