Filter presses are used for dewatering and thickening various slurries in industries like chemical, mining, food and beverage, wastewater treatment and more. There are different types of filter press designs based on features like frame material, automation, opening systems and operating pressure.

automatic press machine

Membrane Filter Press

A membrane filter press uses a flexible membrane to aid in the dewatering process. As pressure increases, the membrane expands to come in contact with more of the filter cake surface area, squeezing out more liquid.

  • Can achieve high dry solid rates of 40-60%
  • Handles low to medium solid content feed slurries
  • Ideal for applications requiring consistent filtrate quality

Ultra High Pressure Filter Press

An ultra high pressure filter press can operate at very high pressures of up to 120 bar (over 1740 psi).

  • Produces filter cakes with very high dry solid content
  • Compact design requires less floor space
  • Often automated with PLC control systems
  • Made with thick steel frames and heavy duty internals
  • Used in mining and mineral processing for products like gypsum, potash and phosphate

Stainless Steel Filter Press

A stainless steel filter press has all wetted parts made of corrosion resistant stainless steel. This makes it suitable for handling acids, alkalis and other chemicals that can corrode carbon steel.

  • Handles abrasive and aggressive slurries
  • Resists corrosion and pitting
  • Easy to clean and sterilize
  • Available in 316L, 304 and other stainless grades
  • Often used in chemical, pharmaceutical, food and semiconductor industries

Other Common Types:

  • Automatic filter presses – Controlled using Programmable Logic Controllers for precision and repeatability.
  • Quick opening filter presses – Open and close fast using lever, hydraulic or pneumatic actuators for higher throughput.