papr15 - Paper Machine Wet-end Lecture 15 PAPR 1000...

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1 Paper Machine Wet-end Lecture 15 PAPR 1000 Introduction to Pulp and Paper Manufacturer
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2 Summary of Papermaking Unit Operations Stock Preparation Beating/ Refining Fiber cutting & fibrillation Makes fiber flexible, high surface area, increase fiber-fiber bonding Additives Sizing, filler, dyes, retention aids Increase water resistance, optical properties, color, Cleaning/ Screening Remove contaminants Fiber bundles, plastic, sand etc.
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3 Summary of Papermaking Unit Operations Paper Machine (Fourdrinier) Forming Matt of fiber from suspension Cy% In (~0.5 -1.0%), Out (~18 - 22%) Pressing Squeeze water out/ consolidate web Cy%: In (~18 -22%), Out (~40-45%) Drying Evaporate water /bond web (hydrogen bonds) Cy%: In (~40- 45%), Out (~93-95%) Calendering Replication process Smooth surface, compress thickness Reeling/ Winding Wind paper uniformly, slit reel into rolls Finishing
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4 Papermaking Process ± The papermaking process consists of two primary processes: wet end operations dry end operations ± In wet end operations, the cleaned and bleached pulp is formed into wet paper sheets ± In the dry end operations, those wet sheets are dried and various surface treatments are applied to the paper
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5 Paper Mill Schematic
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This note was uploaded on 04/02/2008 for the course PAPR 1000 taught by Professor Joyce during the Fall '08 term at Western Michigan.

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papr15 - Paper Machine Wet-end Lecture 15 PAPR 1000...

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