Your advantages at a glance
- Heavy duty machine construction
- Small footprint
- Very reliable and low maintenance
- Low noise and dust emissions

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RS30-40 Holzzerkleinerer | UNTHA

High reliability for many years to come

The reliable and very sturdy RS30 and RS40 shredders have been tested and proven over several decades and are used particularly for processing long solid timber pieces. The wood chippers can be operated as stand-alone solutions or integrated into complex systems where they tend to be a favourite thanks to their very compact design. They are characterized by their high availability and unique productivity.

The high reliability of this series is a result of the machine's rugged cast-iron frame design and the sturdy cutting unit. The low-speed, 4-shaft shredders are not sensitive to foreign objects and are very low maintenance. Thanks to the pull-in mechanism the shredder does not need a hydraulic pusher system, which further reduces the need for maintenance. The low speed of the cutting shafts ensures low noise and dust emissions in your operations.

The machines are particularly productive thanks to the high torque in combination with a large perforated screen surface and are a favourite for multi-shift operations. In the event that foreign objects are pulled in, the shredder automatically shuts down thereby preventing greater damage to the cutting unit. The shredder is additionally equipped with an automatic reverse to prevent motor overload.

Take advantage of the 3-year carefree warranty when buying an UNTHA wood shredder*

We are convinced of the reliability and quality of our products and are willing to prove it. In fact, we are the only manufacturer offering this special form of security!

*or 2,000 h, depending on which is reached first.


RS30/40 applications:

  • Solid timber (long pieces, splinters)
  • Sawmill waste
  • Cap timber
  • Trim pieces
  • Veneer
  • Cardboard/paper (mixed with wood)
  • Coniferous wood bark
  • and many more. 

More details available below in the downloads section!

Four-shaft shredding system

As the inventor of the four-shaft cutting system (patent no. 319535), we have kept developing these products and continually adapted them to fit market needs. Due to their sturdy design and high productivity, four-shaft shredders are used for materials that are difficult to shred. Thanks to the special layout of the cutting shafts, the pre- and re-shredding occurs in just one process step.

Reference: Weinberger Holz GmbH Weinberger Johann jun. (CEO)

„Our company operates 24 hours a day with three shifts. Therefore we needed a reliable wood shredder that would meet these challenges. By choosing the RS30 we have made the right decision."

RS30 Wood shredder fully integrated in the overall system


Shaftless conveyor spirals are a cost-effective alternative to traditional conveyor screws. The flexible conveyor spirals come in various lengths and diameters. Our technicians will be happy to design a customised solution for your application.

We are also happy to provide infeed and discharge conveyor belts. These will be optimally adapted to the on-site conditions and the desired throughput performance of the shredder.

A popular solution to ensure efficient metal separation is to use conveyor belts equipped with a magnet separator at the pulley. The combination system is a favourite among our customers. UNTHA technicians will be happy to design a customised solution for your application.

Our wood shredders can be equipped with a discharge screw as well as a conveyor screw. Depending on your application, we will be happy to offer you customised solutions in various lengths and inclines.

Shredding residual timber with nails or screws is no problem for our shredders. Pipe magnets are commonly used in extraction situations to separate metal pieces from the wood. We can offer you different pipe magnets depending on your application.

We are able to adapt the hopper exactly to your needs depending on the infeed. Regardless of whether you need a particularly wide hopper for a wheel bearing infeed or a hopper with flip-top lid. We offer customized solutions.

Customized substructures offer you maximum flexibility. The wood shredder is thus easily adapted to the on-site conditions and to your existing conveyor technology.