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Prä machines and devices for finishing book blocks

PräLomo Pro

Book back rounding machine

The PräLomo Pro is a pneumatic machine to round book blocks in a wide size range.

The PräLomo Pro is a pneumatic machine to round book blocks in a wide size range. 
It rounds assorted book blocks (with frequently changing block thicknesses) as well as series of blocks.
The device consists of a basic frame with a table that is adjustable in height and a mobile rounding bar with which the rounding of the book block is achieved.
This rounding bar is heated. The temperature can be  adjusted progressively by a temperature control. Thereby the fan-bound back is heated during the rounding process. The book block may then be rounded much easier and the rounding is even.
The table plate is adjustable in height in order to adapt it to different block thicknesses. The thickness is adjusted with a locking lever on the left side of the machine.
Moreover, the machine has a built-in heating plate on the right side. The book blocks are piled into the plate for heating up prior to rounding in order to soften the fan-bound backs. 

At first, the heating of the device is switched on. The heating process takes approx. 5 - 10 minutes. It is recommended to arrange the book blocks to be rounded according to their thickness and to put the first blocks into the heating plate.
Now the block thickness of the first book block is adjusted with the locking lever. 
The book block is placed on the table and pushed against the now vertically standing rounding bar with its fan-bound side.

Now the foot pedal is pressed a few times , until one half of the book back is rounded. While activating the pedal, the book block is held back against the rounding bar with both hands. Then the book block is turned and the other side is rounded in the same way.
With the pneumatic system, the power of the rounding plate is adjusted by foot pedal. The stronger the pedal is pressed down, the stronger the block will be rounded.
With only a little practice the stronger the rounding plate presses.

PräLomo Pro only rounds book blocks bound with dispersion glue (cold glue). Blocks bound with hotmelt may not be rounded as the heat would "reactivate" the hotmelt. 
The rounding of PUR-bound blocks may only be possble after intensive testing and wihtin a very short time frame.

  • Floor space: 104 x 48 cm
  • Height: 114 cm
  • Weight: 87 kgs
  • Power supply: 230 Volt / 50 Hz / 430 W
  • Air supply: 6 bar   

Book block sizes:
  • Thickness: 8 - 80 mm
  • Height: 0 - 520  mm

  • Output: approx. 100 - 150 pcs / hour (depending on the material)


easy operation

wide format range

quick adjustment of table plate to block thickness

heated and moveable rounding plate for quick and even rounding

rounding plate power adjustable by foot pedal

built-in heating plate for pre-heating the glued spines prior to rounding


hardcover books




Logo Schmedt

Book block finishing with Prä machines

Any question on this machine?

International dealers

How to reach us

Service and orders

040 - 734 744-0
International: +49 40 734 744-0

Opening hours
Mon -Thu: 8 am - 5 pm
(Pickup time until 4.30 pm)
Fri: 8 am - 3 pm
(Pickup time until 2.30 pm)

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