SCREWS AND BARRELS | MACHINERY


Developments in screw and barrel technology


Keeping tabs on screws and barrels is becoming more commonplace – through recent innovations that can monitor wear or track screw efficiency


Screws and barrels are hidden internal components of the extrusion line – often ignored until something goes wrong with them. These days, economic concerns mean that processors are paying more attention to this vital equipment – either through systems to monitor their performance, or by taking advantage of various refurbishment options. UK-based Magog Industries offers fast turn-


round on screw and barrel refurbishment and repair to customers – which it says can help to minimise machine downtime. The company designs, manufactures and supplies a range of screws and barrels for process- es including extrusion, as well as offering repair and refurbishment of pre-used parts. “This saves our customers money – not just against OEM items, but in turnround too,” said John Allsop, director and general manager. “One


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of our key advantages is that we design everything to meet specific processing and production requirements”. Screw designs are configured to maximise performance from single start compression to a range of mixing elements for optimised distributive and dispersive mixing. The company also config- ures design for complex parallel and conical twin extruder screws. Using materials such as EN 41B Steel gives


hard-wearing properties while allowing refurbish- ment of hard-welded flights at a later date. Surface treatments include ceramic, chrome, Hastelloy and Armoloy, in addition to nitride and bi-metallic hardened. The company has used surface treatment against abrasion and potential corrosion to increase screw resilience and longevity – specifi-


March 2021 | PIPE & PROFILE EXTRUSION 23


Main image: Magog says that fast refurbishment and repair of screw and barrel helps minimise machine downtime


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