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Puncher for flat extruded slabs

The puncher for flat-extruded slabs is used as a standard to produce square and rectangular slabs and contour slabs.  Special punching tools also punch smaller slabs. Punching of non-square sizes is also possible upon request and after consulting the KELLER ICS design department. The edges of the slabs can either be round, angular, antique or chamfered.

Product sizes:

Flat square and rectangular slabs and contour slabs with the dimensions

  • Clay column width (TB) min/max: 100 / 600 mm
  • Clay column height (TH), max.: 25 mm
  • Clay column cutting thickness (TS) min/max: 110 / 600 mm

High capacity for the production of klinker brick slips. Special punching tools are available to punch also smaller slabs. If you require non-square slabs please contact our design department. Larger cutting lengths are possible when using the cutting suppression feature, but this might lead to a reduction of the cutting precision. The cutting precision is ±0.25 mm at a variation of the clay column speed of ±5 % max.
The edges of the slabs can either be round, angular, antique or chamfered.

Technical features

  1. Sturdy welded steel structure serves as base frame
  2. The drive elements are maintenance-free, guided in ball bearings and ball linings.
  3. The head frame is mainly made of aluminium.
  4. The punching tools are operated by special pneumatic cylinders.
  5. The clay column is forwarded on a felt belt, thus avoiding that the clay column sticks to the belt after punching.
  6. A measuring roller/measuring tape with pulse generator measure the clay column speed.
  7. The electronic control system assures a high cutting precision.
  8. The puncher is driven by a servo motor with 18 Nm at 2000 revolutions/min, corresponding to approx. 4 KW.

Working method

A measuring roller, rolling over the waste strip, measures the clay column speed and transmits it to the control cabinet. The signal is then transmitted to the servo drive that drives the punching table and the belt conveyor. The belt conveyor moving at clay column speed forwards the clay column towards the punching table area. During the punching process, the punching table with its head frame moves forward at clay column speed. The four sides of a square slab are punched in two cycles.

During the first cycle a longitudinal knife cuts off the lateral waste and a transverse knife cuts the required length needed for the tile from the clay column.

A longitudinal knife and a transverse knife are working in the second cycle.  The punching knives are operated pneumatically. As far as possible, this method prevents the clay column from being jammed between two punching knives. If jamming of the clay column cannot be totally avoided during the process, holding down devices fixed approx. 1 mm above the clay column prevent the clay column from being lifted up. A V-belt conveyer upstream of the belt conveyor accelerates the punched slab and forwards it to the dryer car loading station.

Cutting system

0.5 mm thick fixed spring steel sheets serve as punching tools. The spring steel holders are shaped to chamfer or round off the products during punching. Varying shrinkage behaviour of the slabs can be compensated for by adjusting the punching knives.

Additional equipment

  • "Cutting suppression" device for a cutting thickness TS of more than 600 mm to any length -...... electronic (the pneumatic punching knives are not activated)
  • Special tools to handle various contours
  • Pre-punching tools for special sizes (hexagons, octagons, slabs with round contours, etc.)
  • Texturing rollers to roll in different textures.

Pallet loading equipment

The products are either forwarded to "roller box" loading stations or transferred to pallets by suction transfer devices.

Punching table

Punching capacity

Generally, the punching capacity depends on the length of the product. For sizes with a clay column width (TB) of 260 mm and clay column cutting thickness (TS) of 260 mm, the capacity is 60 punches/min. Compressed air requirement approx. 300 NI/min, required working pressure 6 bar.


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