Our ProMax Series of refiner plates enables customized solutions through optimized designs for long lasting and more energy-efficient fiber development. This series incorporates all of J&L Fiber’s latest plate technology, including our patented alternating deep grove design as well as our flagship alloys.

Created with our proprietary PowerCast technology, the ProMax Series is uniquely different than competitive offerings because of its customization flexibility. Plate patterns can be customized to increase fiber quality, refining efficiency, capacity and life, while reducing wear and plugging.

Pro Max Reverse Flare, Single Zone, Overhung Design w/ Radial Feed Grooves
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Pro Max Reverse Flare, Single Zone, Overhung Design w/ Radial Feed Grooves

The ProMax Series, with its two different designs, demonstrates J&L’s latest design technology made possible through our optimum design features which include:

  • ReverseFlare Anti-Plugging Grooves
    • No transition zones and no pinch points
    • Lower pumping angle designs available for longer plate life
    • Lower  pressure rise and less fiber channeling in lower flow conditions
  • Low Bar Draft Angles
  • Patented Alternating Deep Groove Designs
  • Flagship Alloys: C90, C91, C96 and the new AeroMax MX Series

ProMax advantages

  • Maximize KM/Rev for lower intensity refining while maintaining hydraulic capacity and plate life
  • Maximize hydraulic capacity while maintaining refining intensity and wear resistance
  • Maximize plate life with more wear-resistant alloy while maintaining capacity and refining intensity
  • Maximize groove width for less plugging while maintaining refining intensity and wear resistance
  • Maximize energy efficiency

J & L’S Patented Alternating Deep Groove Technology

Our engineered alternating deep groove design optimizes bar height/width ratios and is a significant factor in enabling pattern customization flexibility.

With this alternating deep groove design, we increase bar strength at the base of the bar and maximize the bar height and volumetric groove area. This gives us the ability to customize patterns for optimum fiber development, high durability, maximum capacity and plate life; in addition to being able to maximize alloy wear resistance.

ProMax Constant Angle Multi-Zone


  • J &L Fiber Services’ patented alternating deep grooves
  • Uniform bar crossing angles over entire plate surface
  • Fibers refined at constant crossing angle
  • Homogeneous fiber treatment and quality
  • ReverseFlare anti-plugging grooves
  • Individual refining zone customization for bar and groove width, as well as bar angle
  • Dam patterns are available for pulp mill applications
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ProMax ReverseFlare


  • J & L Fiber Services’ patented alternating deep grooves
  • Continuous ReverseFlare anti-plugging grooves
  • Radial feed grooves—improved feeding into refining zone
  • No transitions zones, no pinch points—reduces plugging potential
  • Lower pumping angle designs available for longer plate life, lower pressure rise and less fiber channeling in lower flow conditions
  • Dam patterns are available for pulp mill applications
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Refiner Plate Design

Different refiner applications require different plate designs as system optimization is undertaken.

Fiber treatment, hydraulic capacity and breakage resistance are three critical parameters that must be considered when designing and applying low consistency refiner plate patterns.

A paper mill can optimize its low consistency refining operations on two fronts:

  • Monitoring and eliminating as many detrimental hydraulic, mechanical and process conditions as possible.
  • Ensuring that the proper plate designs and alloys have been selected.

By working together with our papermakers, J&L Fiber Services seeks to develop strategies to optimize the unique needs and performance of a particular paper mill.

Given the difficulties of being able to control all of the many process variables, refiner plate design becomes extremely critical. The key design parameters, relative to delta P (refiner pressure control) are: groove depth, groove profile, number of bars & total pumping angle.

The intensity of refining that is required will determine the bar width/groove relationship,or pitch. However, groove width should be altered to optimize the throughput rate. This can be done without changing the pitch or intensity by altering the bar width correspondingly.

A special caution when altering groove depth for flow control: While no appreciable negative effect will occur when groove depth is reduced for lower flow rates, increasing groove depth poses some risks. First, it is less efficient than increasing groove width. Second, it can have a negative effect on energy efficiency, because increasing groove depth increases the no-load energy required to spin the rotating element in the stock slurry.

Bar angle is significant to the extent that it affects the delta P and is a tool for hydraulically balancing the refiner.

The relatively infrequently used practice of running the low consistency refiner plates in the holdback position can effectively compensate for low flow conditions which are detrimental to fiber quality, plate life, etc. During holdback, the intersecting bar angle between the rotor and the stator is moving towards the center line of the refiner rather than towards the periphery of the disc, as in pumping position. Holdback will increase the turbulence in the grooves and the plate gap.