Black Line
Black Line Cold Milling ®
Milling Drums

Our strength since the beginning.
The result of continuous research and commitment

Dry milling is part of the finishing, one of the most complex phases of the tanning process. Its purpose is to improve the leather's softness, giving it a more accurate grain pattern. This is done by shaking and mechanical stressing the leathers in an environment with controlled temperature and humidity.
During this phase of the process it is possible to apply chemical products (Chemical Milling®) to obtain leather with specific technical or fashion effects.


Erretre drums are provided with efficient dedusters for dust collection and suppression

The tanning process still today, as in prehistory, transforms a waste of the much more important food industry into a useful and durable product, suitable for the production of countless objects.
This process, already ecological in terms of circular economy, waste management and recovery, needs to be controlled and managed to minimize environmental pollution. The main consequence of  finishing processes are the introdution into the air of dust particles and volatile substances (aerosols), residues of the treatment of the leather and the use of chemical additives.
Erretre has always put environmental importance first and works constantly to improve the air purification and purification capacity of all its machines, from drums to spraying lines up to drying tunnels, with the possibility of studying ad hoc projects for the area, place and purpose of use, in order to further increase their effectiveness.



Technology for the application of a range of solvent-free chemical products developed in collaboration with a leading chemical company to modify the characteristics of the leather directly during the milling process rather than by spraying.

Chemical Milling® is a registered trademark adopted by Erretre to allow the use of finishing chemical products without detrimental side effects on the machinery itself or on the skin, while avoiding any dispersion of the same in the environment.
Covered by several patents, both in mechanical construction and in the application process, it represents a triple advantage as it ensures great production flexibility, consistent results, respect for the people and the environment.


Those who choose Erretre know they can count on drums built to have a particular and careful attention in working and treating the leather. Thanks to the Erretre accessories it is possible to exploit the full potential of our machines, increasing their efficiency, ease of maintenance, cleaning and broaden their usage with the optimal injection of chemical products.


(Chemical Dosing Unit)

Stainless steel tank for dosing chemical products with the patented method: Chemical Milling®

 "TOP" option 

Self-cleaning plastic profiles
Designed to keep the inside of the drum clean even in the presence of high humidity

Double Heating Unit
Greatly reduces both pre-heating and drying time

Double Injection Technology

It optimizes the dispersion of the chemical products and allows to have separate circuits for the injection of water and products.


It is currently possible to install a humidification unit with compressed air integrated in the drum, or an external pre-humidification unit to replace our traditional airless system with variable flow nozzles.


A stand alone refrigeration unit very useful for machines operating in tropical climate where, due to high humidity and temperature it is not possible to fully remain within the parameters suitable for optimal milling.


Exceptional technology and attention to customer needs are combined in a new concept of tannery. The Erretre automation ensures superior efficiency with high quality results, and optimal process organization of leather treatments.
Seize full control of your production.

  • State-of-the-art software, easy and user friendly. Instant data collection and communication system. Historical analysis of all processes.


    Full Computerized Local Automation with PLC

  • Manage the entire programming of your battery of drums from the comfort of your desk.
    Real time data collection and management, with production cycle times study and analysis.


    Milling Organizational Resource

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