Method for producing plastic film

Abstract

In one embodiment, the film making process can comprise: introducing a plastic melt to a nip between a calendar roll and a resilient roll, passing the plastic melt between the calendar roll and the resilient roll to produce the film, and controlling a roughness of the film by actively cooling an external surface of the resilient roll. In another embodiment, the film making process can comprise: introducing a plastic melt having a melt temperature to a nip between a calendar roll and a resilient roll, passing the plastic melt between the calendar roll and the resilient roll to produce the film, and adjusting a roughness of the film at a constant production rate and a constant nip pressure.

Description

Background technique [0001] In flat panel displays (eg, backlit computer displays), optical film (which may also be referred to as a sheet, layer, foil, etc.) material is often used, for example, to direct, scatter, or polarize light. For example, in a backlit display, a brightness enhancement film uses prismatic structures on its surface to orient light along the viewing axis (ie, the axis normal to the display (ie, perpendicular to the display)). This increases the brightness of the light seen by the user of the display and allows the system to consume less power while creating the desired level of on-axis illumination. The films can also be used in a wide range of other optical designs, such as in projection displays, traffic signals and illuminated signs. [0002] Currently, backlit displays use, for example, a plurality of thin films which are arranged in such a way as to obtain the desired brightness and dispersion of light directed towards the viewer. It is desirable ...

AI Technical Summary

Problems solved by technology

On the production line, to achieve 40% haze on a textured polycarbonate (PC) film with a thickness of 7 mils, production rates have been low, i.e., limited to 20 feet per minute (ft / min)

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