Coperion Werner & Pfleiderer: Order for world-scale Polypropylene compounding plant

Yet another milestone in the development of Polypropylene (PP) compounding and pelletizing systems has been reached by Coperion Werner & Pfleiderer GmbH & Co. KG, Stuttgart: this German company will soon be delivering a plant to the Near East with a guaranteed throughput rate of 72 tonnes/hour. Compared to the hitherto largest PP compounding and pelletizing plant, likewise built by Coperion Werner & Pfleiderer and giving service in Poland’s largest petrochemical site in Plock, this new plant will represent a further considerable increase in capacity. This contract represents yet another confirmation of Coperion Werner & Pfleiderer’s worldwide technology and market leadership in the manufacture of world-scale plants for Polyolefin compounding. The customer is a renowned engineering company serving mainly chemical and petrochemical companies in all parts of the world. As a leading contractor for polymerization plants for Polyolefins, this company has already delivered and installed over 70 Polypropylene compounding and pelletizing lines for operation in its customers’ plants.
The nucleus of the PP compounding and pelletizing plant is a ZSK 380 twin-screw compounder featuring 380 mm diameter screws. This compounder, which has already proved itself in numerous PP and PE applications, is equipped with a variable speed drive that has a total power output of 19 megawatts – a first in PP compounding. A Suprex superpositioning planetary gear unit combines the outputs of a 14 MW fixed speed motor and a 5 MW variable speed motor, making screw speeds of between 193 and 276 rpm possible. This gives the ZSK 380 MEGAcompounder a large operating window, permitting the compounding and pelletizing of PP
grades of varying viscosity at high throughput rates with a minimum possible energy input.
Considering the extremely high throughput rate requirement, Coperion Werner & Pfleiderer have also developed two new components of discharge equipment based on existing, service-proven systems:
Located immediately downstream of the compounding extruder is the enlarged SWZ 21000 screen changer, which removes all foreign bodies and impurities from the melt and permits a fully automatic screen change – 21,000 cm² effective filtration area – while the plant continues to operate.
The throughput rate of 72 tonnes/hour necessitated the development of the high-capacity UG 925 underwater pelletizer. Being used for the first time with PP, this pelletizing system is based on the UG 1000, a pelletizer that has already proved itself in PE applications, and is equipped with an intensively heated pelletizing die.

Delivery and commissioning of the compounding and pelletizing plant is planned for the second half of 2007.

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