This paper will cover the unique characteristics of polyester; discussing coextrusion, pretreats, microvoiding and down-gauging technology; how this technology can be utilized to produce unique products for packaging, holograms and other applications. This paper will also review how polyester films compare with other plastic films, dimensional stability, barrier properties, both in metallized and unmetallized configuration. We will also discuss future availability of supply, the next generation of high temperature polyester (PEN) and it's impact on the environment. Although polyester by most standards is considered the preferred plastic substitute for vacuum deposition, this is primarily based on its physical unique characteristics: heat stability, uniformity and thickness throughout the web, along with its high clarity, etc. It is also realized there is no perfect structure, therefore, it is necessary to modify the polyester film internally or by some form of surface treatment. Today we will review the technology that allows this modification to be accomplished and review some of the uniqueness that has been built into polyester films. We will also outline how these treatments have solved problems in various markets and how some of these processes can be used in vacuum deposition processes and markets.
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