papr19 - Sizing, Coating & Converting Lecture 20 PAPR...

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1 Lecture 20 PAPR 1000 Introduction to Pulp and Paper Manufacturer
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2 Sizing and Coating Processes ± Application and metering devices are combined in different configurations to develop a sizing/ coating strategy for producing a desired grade from the provided base sheet. ± These different configurations are known as size press and/or coaters.
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3 Sizing/Coating Unit Operations ± Application ± Metering ± May occur simultaneously or sequentially
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4 SURFACE SIZING ± Sizing operations are carried out to – provide paper with resistance to penetration by aqueous solutions – Improve surface properties – Improve strength properties • Surface strength • Internal bond
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5 Size Press Applications ± Surface sizing of base stock ± Precoating ± Pigment coating
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6 Size Press Simultaneous application, metering and distribution
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7 Size Press as a Pigment Coater ± The “original” pigment coater ± < 5 gsm (3#/3300 ft 2 ) per side ± < 30 % solids ± < 500 mPas viscosity ± Wash coating and precoating
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8 Surface Sizing Chemicals ± Starch ± Film formers other than starch -CMC - Polyvinyl alcohol - Alginate ± Other specialty surface sizes ± Pigments ± Latex and other binders
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9 Types of Size Presses ± Conventional pond or “puddle” size press - saturates sheet –Vert ica l – Horizontal – Inclined ±
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10 Vertical Size Press ± The original size press - adopted from textile industry “padder” ± Pickup vary two-sided ± Viscosity sensitive ± Useful only on low speed machines - mostly in text and cover mills
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papr19 - Sizing, Coating &amp; Converting Lecture 20 PAPR...

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