They are energy efficient, robust and low maintenance. Soft to medium hard materials can be processed by introducing them into the high velocity air stream between the stationary and rotating elements of the mill. The extreme turbulence which causes the particles to constantly change direction and impact against each other allows them to fracture along boundary lines and be micronised.
Any heat generated when the particles are so rapidly reduced is dissipated into the air stream. By introducing hot air into the system it is possible to simultaneously dry and grind which is an excellent method of handling heat sensitive or sticky materials. Explosive or very heat sensitive materials can be processed in cryogenic systems cooled with liquid nitrogen or operating within an inert atmosphere. Jäckering have many years of experience in manufacturing pressure shock resistant systems for these applications.
The operating principle of the mill is a rotor fitted with special tools and rotating at a high peripheral speed within a solid replaceable stator. The mechanical design is conservative allowing the mill to operate safely under
severe conditions and high peak loadings.
The tooling on the rotor and the design of the liner of the stator accelerate the particles to very high velocities within the air eddies ensuring high energy impact between the particles and excellent heat transfer between the air stream and the product.
Material enters the mill at the base of the rotor and on leaving the grinding zone it enters a sifting section where the oversized particles are returned to the bottom of the grinding zone.
As the micronising effect is achieved from particle to particle attrition the wear on the mill components is minimised. For very difficult products the rotor tooling and the stator liner can be supplied in special materials.