Extrusion: Go from Fluff to Blown Film With Twin-Screw System
System bypasses pelletizing step and can reprocess barrier films.
Reifenhauser has taken its EVO Fusion twin screw technology typically deployed in its non-woven and sheet business units and adapted it for blown film. This allows barrier and other types of films to be reprocessed directly into blown film, bypassing the pelletizing step and eliminating a heat history.
The twin-screw extruder is equipped with a degassing unit to extract impurities and contaminants to reduce the risk of gel formation. With this technology, film processors reportedly can recycle conventional barrier film, such as PE/nylon structures with up to 30% nylon content, allowing them to reuse old barrier film or production scrap to obtain valuable raw materials and produce other high-quality films, such as industrial packaging, sacks, construction film or agricultural film. EVO Fusion allows direct extrusion and requires no pre-processing.
Most extrusion operations generate scrap, and in the case of sheet for thermoforming it can exceed 70% of total output.
Use of magnets for removing ferrous contaminants in an industrial environment began in the 1940s to help farmers trap and remove metal contaminants from their grain chutes.
The most important factor in troubleshooting problems in ultrasonic welding is understanding the fundamentals of the process.