Slotted and
backside plates

Hardened rolled steel and innovative design

All diaphragm plates from Christian Pfeiffer are produced using highly wear- and breakage resistant rolled steel, which is a superior material compared to plates produced using cast material. The innovative design of the slotted and backside plates makes the entire grinding process even more efficient, and ensures a long service life for the equipment.

breakage resistant
up to 60 HRC
optimum
material flow
long serivce
life

Technical  details

  • Manufactured using highly wear and breakage resistant special rolled steel with up to 60 HRC
  • Plate slots with optimum narrow conical openings for optimum material flow and high process stability prevent natural blockages: The material is transported onward only after it has been sufficiently ground.
  • Innovative fastening system: Bolt fastening with conical swages ensure accurate fitting for the plates. Efficient use of the plate up to a residual thickness of 8–10 mm. Utilization rate of 75 % compared to 60 % in conventional systems. Thanks to the use of tear-off bolts, fitting errors are effectively reduced and the plates are securely fixed to the frame.
  • Long service life thanks to simple maintenance and partial replacement of the wear parts: Depending on the mill diameter, the slotted plate construction is divided into two to four rings. In the event of wear, only those plate rings that are most affected need to be replaced
  • If required, special slotted plates with lifters for those areas subjected to the most wear
Back site plates

more than 5,000 installations worldwide

How do diaphragms improve plant performance?

Modern diaphragms are designed to control the material flow and balance the material level in the first grinding chamber. The special feature of the Christian Pfeiffer intermediate diaphragms is that it directs the material into the second chamber separately from the air flow. This separation of material and air flow means that there is no unused zone behind the diaphragm. The material is fed directly into the second chamber at the backside of the diaphragm. As a result, the effective grinding length of the mill is fully utilized. In many cases, an increase in production of 3 - 6% can be achieved by the intermediate diaphragm MONOBLOC.

What is the average service life of a diaphragm?

The structure of a diaphragm has usually a service life of 10 years. Thanks to the Christian Pfeiffer MONOBLOC design and the floating connection, our diaphragms achieve significantly longer service lives in practice. The slotted and backside plates are replaceable wear parts that are highly dependent on the ground material.

According to the customer, the structure of the oldest Christian Pfeiffer diaphragm was in use in Latin America for 40 years.

What is meant by the self-cleaning effect of slotted plates?

The width and size of the slots define the material throughput and limit the maximum particle size that can pass the diaphragm. If the size reduction is insufficient, coarse particles get stuck in the slots of the diaphragm plates and become lodged. This reduces the throughput capacity and disrupts plant operation. It is therefore important to design the slots in such a way that material cannot get stuck permanently. Thanks to the circumferential slot arrangement and the milled groove for ball guidance, the cleaning effect by the grinding balls is very high. The material that has settled in the slots are pressed through by the passing balls and do not remain in the diaphragm.

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Christian Pfeiffer pilot plant
A story of efficiency

Efficiency in grinding is our heritage and our future.
Since 1925.

Making grinding processes as efficient as possible is a science in itself – one to which we dedicate our entire expertise and spirit of innovation. From the invention of the first MONOBLOC diaphragm to the technical fine-tuning of the separator QDK. How we became what we are today.