papr13 - Stock Preparation Additives PAPR 1000 Introduction...

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1 Stock Preparation: Additives PAPR 1000 Introduction to Pulp and Paper Manufacture
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2 Stock Preparation- Operations ± The following operations are usually involved: Re-pulping Beating / Refining Additives Metering and Blending Cleaning and Screening
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3 Non-fibrous Raw Materials: Chemical Additives ± Only a limited range of properties can be achieved in paper manufactured from wood fibers alone. ± Because of this, the papermaker combines wood fibers with a wide array of chemical additives when preparing the furnish for a particular grade of paper
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4 Chemical Additives ± The chemical additives can be divided into two categories: – Functional additives • Impart/ enhance properties of paper – Control additives (chemical processing aids) • Improve/ maintain runnability of paper machine • Processing aids become particularly important when the secondary fiber content of furnishes increases and when mills close up white-water systems.
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5 Functional Additive Application
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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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papr13 - Stock Preparation Additives PAPR 1000 Introduction...

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