Celluose Industry

Fine-grinding of dry cellulose ether

After the drying process the cellulose ether is still too coarse, and must be ground finer in order to be used as an additive in corresponding areas of application. The Turbofiner, type PLM is used for this purpose. The material is ground in a highturbulent air flow between the fast-rotating beater plates and the stationary grinding zone. The material is fed by vibratory feeder, dosing screw or rotary air lock either through a cyclone separator or directly into a filter. Then, it is separated on a screening machine according to its fineness. Coarse particles are reintroduced into the grinding process.

Dry-Grinding of moist cellulose ether

After the reactor, the cellulose ether is of elastic to plastic consistency. A fine and dry powder is necessary for further use of the cellulose ether. The Turbofiner, type PLM allows product-gentle pulverizing and simultaneous drying of moist cellulose ethers with a starting moisture of 60% of the weight. Ambient air is sucked in and cleaned by an inlet air filter and heated up to 190°C by an air heater. Moist feed material is transported via a rotary valve into the hot air stream and into the mill which pulverizes the material in a high activity rotational field by means of micro whirls. The pulverized product is pneumatically transported and dried again on the way from the mill to the filter. The filter separates the ground material from the conveying, respectively the drying air, and discharges it via a discharging device out of the filter. The retention time of the material in the mill as well as the degree of drying is determined by the air flow. Afterwards the ether is screened, mixed and ensiled. The pulverizing system is designed for an explosive pressure of 10 bar (ü) and is secured by means of an explosion barrier.

Process Flow Diagram for Turbofiner Mill

Decisive advantages

• Cool, Product-gentle fine- and finest grinding
• High throughput rate
• Maintenance-friendly
• Bearing completely separated from the grinding chamber
• Quick and easy cleaning
• Production of finest powders with narrow particle size distribution and high bulk density
• Grinding and drying possible in one processing step
• Flexibly adaptable to different feed materials

Other Area of application

Other Materials that can be processed

Pulverization of soft to medium hard materials. Typical feed materials are

• Elastomers and plastics
• Plant products
• Soft minerals
• Pigments, resins, salts
• Composite materials and recycled materials