How is plastic sheet different from a plastic film?

Plastic sheets are described as a continuous type of plastic material thicker than 0.25 mm that is generally wrapped on a core but also commonly sliced into sheets. Plastic film is anything thinner than that. Plastic material is fed to an extruder machine which delivers molten polymer to a flat die making a continuous sheet that can be very wide.  The extrusion process also includes delivered of the molten material to a variety of rollers that assist in cooling the thermoplastic while keeping the sheet very flat and fully aligned.  Sheet can be formed from a variety of materials including polyethylene of any density and both flexible and rigid PVC.  The sheet can be clear, colored, smooth, rough, functionally embossed, opaque, or semi-transparent, depending on the demands of the application.

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