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MACHINERY | ALTERNATIVE EXTRUDERS


The RingExtruder RE, from CPM Extrusion


Above: Farrel says its CP Series II Compact Processor is particularly suitable for processing highly filled compounds


addition, operators of compounding plants now expect integrated solutions from machinery manufacturers due to an ongoing shortage of internal expertise in these specific areas. Recent projects that Kneading Experts has been involved with include the integration of bio-based raw materials in existing compound families and supporting the implementation of CPR compliance regulations for cable manufacturers. The company also participates in scientific programmes at German universities and institutes, which work on modelled and simulated individual process steps and the full-integrated systems for new compound- ing processes.


Compact solutions Farrel Pomini offers its CP Series II Compact Processor as an alternative technology for the polymer compounding industry. The company says that the unit, which contains an independently controlled continuous mixer and extruder system, is designed specifically for dispersion of highly filled, highly pigmented materials. The Compact Processor is also able to process highly abrasive materials and is designed to support various types of feeding systems and pellet formation compo- nents for versatility. It is available in standard and extra-long (XL) configurations to meet a diverse range of processing requirements. Key machine features include the use of two


Right: CPM Extrusion’s RingExtruder is a 12-screw co-rotating design with good mixing and degassing performance


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counter rotating, non-intermeshing rotors, which are available in various pairings and geometries, and the company says that the mixing chamber barrel incorporates a number of features to enhance processing performance, operation and maintenance. The unit includes a hot feed pumping extruder that provides minimal resi- dence time while individual drive motors for the mixer and the extruder mean mixing can be optimised independently of pumping. The control system can be set in automatic mode or adjusted manually during operation.


COMPOUNDING WORLD | October 2018 www.compoundingworld.com


Group, is a 12-screw shaft co-rotating multi-screw extruder that has been developed for challenging mixing and degassing work. The machine is built on technology developed by Extricom of Germany, which CPM acquired in 2017, and is currently being introduced into several markets. According to CPM, the RingExtruder RE has been created to develop new business opportunities in areas such as continu- ous compounding of rubber or recycling. The company says that models are built according to customer’s specifications and process requirements. In continuous mixing of rubber compounds for high performance tyre and green tyre applications, for example, the mixing and degassing capabilities of the RingExtruder are claimed to offer process advantages and enhanced product performance in terms of grip, rolling resistance and durability. In addition, the machine reduces the number of mixing steps for tyre tread mix preparation and lowers operating costs of mixing operations Currently, CPM says it has more than 10 lines worldwide installed for continuous compounding of rubber.


Flake recycling A further application for the RingExtruder RE is recycling of PET bottle flake, where rising demand for PET recycling capacity is leading to new recycling approaches. The RingExtruder RE is said to be well suited for projects requiring R-PET flake processing, melting and decontamination where it feeds R-PET melt into a virgin melt stream. This meets brand-owner requirements in terms of economy of scale and quality of the final virgin/ recycle mix.


Other manufacturers of multiple screw extruders


include Keimei, which has developed a triple screw extruder for producing polymer blends, grafting, reactive extrusion and dispersing additives in powder form into polymeric melts. Due to short-


PHOTO: FARREL CORP


PHOTO: CPM EXTRUSION


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