papr12 - 1 Preparation of Papermaking Stock Refining PAPR...

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Unformatted text preview: 1 Preparation of Papermaking Stock- Refining PAPR 1000 Introduction to Pulp and Paper Manufacture 2 Papermaking Technology Papermaking Technology ¡ Pulping – Fibers liberated from wood matrix ¡ Papermaking – Fibers formed into sheets and bonded together 3 Stock Preparation Stock Preparation ¡ The conversion of a raw pulp slurry (bleached or unbleached) into papermaking stock – The basic objectives in stock preparation are to take the required pulps (wood or non-wood) and additives, treat and modify each furnish constituent as required, and then combine all the ingredients continuously and uniformly into the papermaking stock 4 Stock Preparation- Functions ¡ The primary function of stock preparation is to – produce a uniform papermaking furnish – modify / improve / add new properties to the paper – enhance paper machine runnability – reduce the paper production cost – reduce the total material cost 5 Stock Preparation- Operations ¡ The following operations are usually involved: – Re-pulping – Beating / Refining – Additives – Metering and Blending – Cleaning and Screening 6 Raw Papermaking Fibers ¡ As liberated during pulping, the fibers are still...
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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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papr12 - 1 Preparation of Papermaking Stock Refining PAPR...

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