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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.
Polyolefin Film Extrusion contains general information concerning materials, methods and equipment for producing high quality polyolefin film products at optimum production rates.
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 allows for higher efficiency and greater uniformity in film thickness than in the blown film. Cast film extrusion takes place in the following steps: extruding the molten polymer through the slot die, then stretching it a certain distance through an air gap onto cooling rollers, and cooling and solidifying the molten film [22].
1 Μαΐ 2005 · Cast film extrusion is a widely used technique to produce polymer films for packaging or coating applications. The final width of the film may be smaller than the initial die width (necking phenomenon) and therefore is the final film thickness larger than what one could expect.
1 Ιουν 2005 · Cast film extrusion is a widely used technique to produce polymer films for packaging or coating applications. The final width of the film may be smaller than the initial die width (necking...
The structures and morphologies in a series of extruded polypropylene films were investigated using density and sonic modulus measurements, wide-angle X-ray diffraction, small angle light scattering and optical microscopy.
