Search results
Results from the WOW.Com Content Network
Polyolefin Film Extrusion contains general information concerning materials, methods and equipment for producing high quality polyolefin film products at optimum production rates.
A competing processing method is cast film or sheet extrusion (sheets have thicknesses above 0.25 mm), in which a slit die shapes the melt into a wide and thin rectangular cross-section that is subsequently cooled by direct contact with temperature-controlled highly polished chill rolls.
In summary, cast film extrusion is a highly efficient process for transforming plastic resins into versatile film rolls. Its superiority over blowing extrusion lies in enhanced cooling mechanisms and precise control over product dimensions and properties.
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.
Extrusion film casting or blown film extrusion can be used to produce thin thermoplastic polymer film. Both processes are very efficient and enable the production of high-quality films with a specific thickness and transparency.
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
Abstract. This chapter contains sections titled: Description and Comparison to Blown Film Extrusion. Plasticating Extrusion. Dies. Cooling. Cast Film Processability of PE resins. Common Cast Extrusion Problems and Troubleshooting.
Production of cast film is a continuous process where a thermoplastic material is extruded from a slot die onto a chill roll, quenched, and wound. The resulting film has machine direction orientation compared to a somewhat limited bidirectional orientation achieved in blown film processing.
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 ...