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Polyolefin Film Extrusion contains general information concerning materials, methods and equipment for producing high quality polyolefin film products at optimum production rates.
Flat Die Co-extrusion • Common process and arrangement for cast film, extrusion coating, and extrusion laminating • Differences in materials processed, typically lower MI for cast film • Differences in die manifold geometry, typically T-slot for extrusion coating & laminating vs “coathanger” for cast film
2 Δεκ 2013 · This document provides an overview of the cast film extrusion process. It describes the main components of a cast film extrusion line including gravimetric feeders, extruders, filtration systems, flat dies, cooling units, gauge control systems, corona treatment, and winders.
Cast film extrusion allows producing technical polymer films for packaging and coating applications. Different kinds of defects may be observed. For packaging applications, the challenge is to obtain very thin films in stable conditions at the highest throughput.
Components in the cast film extrusion process, as shown in Figure 45.22, are as follows: • Extruder, either single or twin screw, equipped with a film die • One or more casting rolls • Polished chrome rolls for cooling and polishing the film • Vacuum to remove air from behind the film to assist laydown on the casting roll •
CAST FILM EXTRUSION. Single and multi-layer plastic film products are often obtained by flat cast extrusion. This technology is specifically suited for the production of food packaging and technical films, as well as for stretch and bubble film (PE, PET, PP, PVB, PS...).
1 Ιαν 2010 · This chapter focuses on blown film, cast film, and lamination processes. Blown film extrusion is a major processing technique used for producing a biaxial melt drawn film. This technique uses air pressure to produce a transverse direction (TD) draw and a higher speed haul off roll speed to provide a machine direction (MD) draw.
