| 摘要 |
Polyolefin, polyester and cellulose ester plastic sheet products produced at high production rates without optical or visible defects by extruding the plastic in the molten state into a water quench bath, and completely removing surface water from the quenched sheet. This is accomplished according to the instant invention by heating the sheet immediately after it leaves the quench bath to impart internal heat thereto, removing surface water by conveying the wet sheet through a pair of squeeze rolls which hold back the bulk of the excess water and spread any water not thus removed in a layer of minute thickness over both surfaces of the sheet, and thereafter conveying the heated sheet from the exit side of the squeeze rolls for a sufficient distance and a sufficient interval to permit the internal heat previously imparted to the sheet to evaporate all remaining water therefrom.
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