What Are the Benefits of a CGR vs. Non CGR Filter Plate For Dewatering Operations?

Wednesday, March 29, 2017
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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.

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.

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
Filter Press Plate

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.

Filter Plates

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.