Equipment Description:Background to Recycling Board and Packaging
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The aim of a Board and Packaging recovered fibre line is to convert post consumer paper into a pulp for use on the Paper Machine. The equipment and process design is arranged differently depending on the final product requirements and the type of furnish used. For example, multiply systems often require a more complicated fractionation system than single ply products. This does not mean that multiply board cannot be produced using a single stream system. The diagram below shows a typical example of a system for Board and Packaging grades. This system produces 3 fractions of stock that can then be re-blended later to provide different strength and optical qualities in each ply. |
FPP: Fibre Preparation plant SFF: Short Fibre Fraction MFF: Medium Fibre Fraction LFF: Long Fibre Fraction SLFF: Super Long Fibre Fraction DAF: Dissolved Air Flotation |
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A pulper is used to break down the recovered paper into pulp at a low consistency (approx 5%). The pulp is then cleaned using detrashing, screening and centrifugal cleaning to remove contaminants from the pulp that cause damage to the subsequent equipment and affect the optical properties and performance on the Paper Machine. The stock then goes into a fractionation stage which produces one very clean, short fibre fraction and one dirty long fibre fraction. The short fibre fraction is clean enough to only need one more centrifugal cleaning stage before thickening and storage. The long Fraction is then fractionated again to produce a Medium Fibre fraction and a Long fibre fraction (or Super Long) These fractions then have further cleaning and screening. This gives the Board manufacturer the opportunity to blend the stock in a way that optimizes the strength and optical properties for each ply. It is important that the water loops in the system are carefully controlled to prevent re-contamination of the stock. |
Background to Recycling Board and Packaging was also mentioned in the following Fact Sheets (38):
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