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Plastics Processing: Calendering

Calendering is a specialty process for making large volumes of high-quality film or sheet, most commonly using polyvinyl chloride (PVC). The liquefied material is passed over four to seven rolls (calenders) arranged in an L- or F-shaped configuration. The rollers, which are usually heated by means of circulated thermal fluids, apply heat and pressure on the material to stretch it into the desired thickness, cool it, and impart superior surface quality. If desired, in-line embossing, such as patterns on flooring tile, may be done before the PVC is trimmed and stored.

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