FG duplex filter for use in milling machines

Efficient cooling lubricant filtratoin in milling machines
August 25, 2025 by
FG duplex filter for use in milling machines
Carmen Steiner

Schäfer Kunststofftechnik GmbH​, based in Ortenberg, successfully produces high-quality products from semi-finished plastic products: in addition to designed machine claddings of complex construction for mechanical engineering, unusual diffusers for the lighting industry or complex precision parts for laboratory and automation technology, our customer also offers solutions in the field of interior design and advertising technology. With its experienced team, Schäfer Kunststofftechnik is a complete supplier of components, assemblies or end products made of acrylic glass, polycarbonate and engineering plastics - whether prototypes, individual parts, small series or large series production.

Whether in the automotive industry, mechanical engineering, medical or plastics technology: machine tools are needed wherever workpieces are manufactured. In metal and plastics processing, over 90 percent of cooling lubricants are cleaned today, ensuring a smooth production process.


Firmenlogo Schäfer Kunststofftechnik

PLASTIC IN PERFECT FORM

Schäfer Kunststofftechnik GmbH, based in 77799 Ortenberg (Baden-Württemberg), is a family-run company with over 60 years of experience in the processing of PLEXIGLAS®, polycarbonate and engineering plastics. Around 100 employees at the site produce customized solutions for the core areas of mechanical engineering, medical technology & laboratory, lighting technology and advertising technology & interior design.

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Challenge

Cooling lubricants minimize the wear of expensive precision machines and make a decisive contribution to the surface quality of the manufactured products. The tried-and-tested double-switching filters from Filtration Group Industrial ensure smooth operation without downtime. The high-performance filters provide the optimum basis for efficient, safe and economical production of high-quality goods without interrupting the process during filtration.

Our customer uses the duplex filter as a safety filter (police filter for the filtration of cooling lubricant. A pump draws in the cooling lubricant. The fluid runs back into the spindle via a hose through the filter. In these applications, the duplex filter is installed downstream of the working filter. It has a safety function and provides maximum safety for internally cooled tools, rotary pressure guides and fine machining bores.

FG Doppelschaltfilter Pi 370

Solution statement

  • At Schäfer Kunststofftechnik, the FG Pi 370 duplex filter with a size of 300 l is used to filter cooling lubricant on a high-quality 5-axis milling machine.
  • The duplex filter ensures reliable operation without downtime. Especially when machining plastic parts with internal cooling of the tool, it is important that the cooling lubricant is free of tiny particles, as otherwise blockages can occur.
  • The use of the FG duplex filter Pi 3730-012 ensures efficient filtration and increases the service life of the 5-axis milling machine, ensuring trouble-free operation over a long period of time.
Doppelschaltfilter an Werkzeugmaschine

Customer benefit

  • Low space requirement due to compact design
  • Minimal pressure loss due to streamlined design of the components
  • Ergonomic changeover lever with lever lock and pressure compensation
  • User-friendly one-hand operation
  • Guaranteed separation rates in accordance with multi-pass test to ISO 16889
  • High differential pressure stability and dirt holding capacity of the elements