Bratney Companies

Cimbria ZS Cylindrical Screening Machines

Application and function


Cylindrical screening machines are used for sorting and grading of seeds and cereals (grain, maize, sunflower seed, rice etc.) and generally granular products (recycling products). The incoming material is sorted according to its width (round perforation) and respectively its thickness (slotted perforation). All kernels thinner than the screen holes fall through the screen (yellow), and all thicker kernels remaining in the screening cylinder are transported to the end-outlet (green).

By means of the permanent circulation of the product and the resulting centrifugal force, each kernel is forced to be in contact with the screen perforation, enabling sorting operations to be carried out with high accuracy.

The single cylinders built as self supporting steel constructions can be joined in various configurations by means of the simple modular system, so that a huge spectrum of sorting targets can be covered. For example, cylindrical screening machines are mainly used for the calibration of maize seed (4 – 6 grades). Thus, the sorting section of the largest maize seed processing plant in the world, currently, (status 2005) is entirely equipped with Cimbria Heid cylinders.

Through the use of vibrating troughs, deflector boxes and discharge hoppers, gentle handling of the product and complete self emptying at the process-end are guaranteed.

Series Production

Cimbria Heid produces machines in series production. During production each machine has to pass several specific quality controls to meet the requirements at the highest level.

Modular System

By means of the modular system previously mentioned, it is possible to realize 12 different sorting diagrams, always using only one drive motor (Energy saving) with chain drive connection to the single cylinders. A maximum of 3 cylinders can be installed above each other.

Parallel operation:

It is necessary to deflect the product falling through the upper screening cylinder so that it doesn’t hit the lower cylinder. Therefore, deflector boxes are used. The oversize product is discharged at the end of each cylinder. The even distribution of product to the single cylinders is achieved by a weight regulated flap on the inlet, to the separate inlet channels.

Series operation:


The product falling through the upper screening cylinder is fed to the inlet of the next cylinder by means of a vibrating trough. The oversize product is discharged at the end of each cylinder.




The outlet of the bottom cylinder can either be fitted with an outlet hopper (left picture) or with a vibrating discharge trough (right picture).

The Screen

Cimbria Heid is one of only a few companies who are producing their screens 100% by themselves. Long experience in pressing technique has led to high precision and therefore accuracy in sorting. The advantage of an in-house punching shop gives us the advantage of short reaction time for subsequent screen deliveries. Generally, round p

Five different kinds of perforation are available:

Standard perforations



Special perforations for very flat products




For special sorting-tasks, we can also offer highly precise wire-screens. Their advantages are the comparatively big open area and the excellent wear-resistance.



Corporate drive


Up to 6 cylinders can be joined to one battery and driven by a single gear-motor with simple chain-drive → Energy saving. The drive can be equipped with fixed speed or alternatively with variable speed (by frequency inverter or by mechanical speed variator gear).



Simple screen-exchange

On the Types ZS300 and ZS500, the screening cylinders are precisely inserted via leading-bars and fixed by means of a bayonet lock. On the type ZS700, the 3 screen segments are attached on supporting discs.



Adjustable Screen-inclination

For regulation of the throughput-capacity, the inclination of each cylinder is steplessly adjustable between 0 and 2,5°.




Permanent screen cleaning

PU-rollers pressing against the screen with their own weight are permanently cleaning the screen to prevent blockage of the screen-holes and therefore avoiding capacity- and quality-losses. For certain products, brush rollers can be installed as an alternative. On request, an additional hand operated cleaning device can be included, which is used only briefly at the process-end to remove kernels which are still stuck in the screen holes.



Technical data

Our cylindrical screening machines operate worldwide.

A large number of worldwide patents justify high research and development expenditure and indicate the high technological standards of our equipment and machines. All over the world the products of CIMBRIA HEID are bought and operated successfully: some 98% of our production is exported. As a member of the CIMBRIA Group, CIMBRIA HEID has access to a global network of highly-qualified partners offering permanent support to customers and their plants.


Download the ZS Cylindrical Screening Machine Datasheet


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