Vented Screw & Barrel for Processing Hygroscopic Plastics

Vented Screw & Barrel for Processing Hygroscopic Plastics


Malik Engineers are leading manufacturers of Vented Screw & Barrel used for processing highly hygroscopic polymers viz. Nylon, Delrin, ABS, Polycarbonate, etc. These polymers are very difficult to process on normal screw & barrels because moisture, gases and volatiles are entrapped in the melt. This not only results in serious accidents, but also slows down the production and the granules/product manufactured is not of standard quality because it has lots of blow holes in it. The efficient design includes single or multiple vent ports on the extrusion screw and barrel to expel out hot gases and other volatiles from the melt, before extrusion through the die. This not only results in safety of operator and processing equipment, it standardises the quality of extruded product and ensures a void-free, technically and commercially acceptable product. The designing is accurately done using CAD techniques, involving accurate calculations and determinations of chamber volumes and pitches for most efficient operation with no material blockages at the vents. The material of construction for both screw and the barrel, is usually special grade of nitro alloy-steel (EN 41-B) pretreated and duly gas nitrided after complete machining, grinding and polishing operations. The extrusion screw is also safeguarded against corrosion by a layer of hard chrome plating which also aids in smooth flow of material and easier cleaning while material and colour changes.

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