Coperion Werner & Pfleiderer GmbH & Co. KG, Stuttgart/Germany, has delivered its two so far biggest compounding lines for polyoxymethylene (POM) to a company in the eastern part of China. Having been put into service in May of this year, the compounding lines are used for the compounding, degassing, stabilizing and pelletizing of the raw POM polymer. Each compounding system is rated for an output of 4,000 kg/hour and comprises the material feed system, a ZSK MEGAcompounder with a 250 mm diameter screw, a continuous screen changer, a WRG 320 water-cooled die face pelletizer for 2 mm pellets, specially optimized for this application, and an intermediate silo for the dry end product. Installed upstream of each MEGAcompounder is a gravimetric feed system with several feeders. During the compounding of the raw POM polymer there is a strong demand for degassing. In addition to the high degassing capacity due to the vacuum domes, the high torque of the ZSK MEGAcompounder has been found to best enhance the product quality.
The Coperion Group, together with the companies Coperion Werner & Pfleiderer, Coperion Waeschle, Coperion Keya, Coperion Hartmann and 20 sales and service companies, is an international market and technology leader for compounding systems and bulk-material systems. Coperion designs, supplies and maintains systems, machines and components for the plastics, chemicals, pharmaceuticals, minerals and food industries. In the 2007 financial year, Coperion achieved sales to the tune of 480 million euros, and employs around 2,100 staff as at 31.12.2007.
