CGR has become common lingo in the filter press world. The term “CGR” refers to a caulked, gasketed, and recessed filter plate. In contrast “NG” refers to a non-gasketed filter plate.
What Are the Benefits of a CGR vs. Non CGR Filter Plate For Dewatering Operations?
CGR filter plate made of polypropylene has a special piped surface to protect the filter cloth, provide excellent filter cloth support and ensure excellent filtration.
There are a number of key advantages in using a CGR filter plate:
- Excellent sealing to allow for a virtually leak-free operation
- Made of polypropylene which offers excellent chemical/corrosion resistance, resistance to high temperatures, and ability to handle high pressure and flow
- Has a special pipped surface to protect the filter cloth and ensure excellent filtration
- Long life
This polypropylene mono/multi satin weave filter cloth (Style 807) is commonly used for metal hydroxide applications and is shown here on a 630 mm CGR filter plate.
As shown here, the CGR filter cloth is shaped like an octagon and is caulked into a groove located around the outer edge of the plate recess. We offer CGR filter cloths to fit a variety of plate sizes from 470 mm to 1500 mm. Markets for CGR cloth/plates include chemical manufacturing, mining, industrial, municipal waste, and food & beverage. Micronics offers latex sealing as a finishing option to further ensure leak-free operations, particularly with larger plates, 1000 mmm and larger.
Though non-gasketed cloth is probably faster and somewhat simpler to install on the non-gasketed plates, use of the CGR allows for a virtually leak-free operation with no dripping, thus contributing to drier cakes. With a CGR plate, the plate seals against the next plate, creating a seal that prevents any wicking.
This caulked, gasketed & recessed (CGR) plate stack is shown on an air/oil filter press with pneumatic shifter. The filter cloth material is a polypropylene, high thread count cloth typically used for applications with a very fine slurry.
CGR filter cloth is installed in grooves within the plate. Groove widths are typically between 1/4” and 3/8” wide. Groves containing an O-Ring around the sealing edge and filtrate holes form a tight seal when the plate pack is closed.
Micronics offers assistance with CGR cloth installation and using the recommended Micronics Model AH-1 Air Hammer makes cloth installation simple and limits arm fatigue for press operators. The air hammer is palm sized, safe and lightweight at only 2 lbs.
Our filtration experts are happy to assist you in selecting the appropriate cloth/plate for your filter press, whatever the make/model.
Contact us to learn more about our expertise in optimizing your dewatering operations.
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