Equipment Description:Recycling for De-Inked Pulp
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The aim of a Recovered Fibre Preparation plant is to convert post consumer paper into a pulp for use on the Paper Machine. Typically, for printing papers, newsprint and Tissue a system similar to the one shown is used, often called a de-inking system. The equipment and process design is arranged differently depending on the final product requirements and the type of furnish used. For example, tissue systems require a higher sticky removal efficiency than SC papers due to the high sensitivity of the Tissue Machine to breaks from sticky contamination. High grade printing papers require a higher final brightness than Newsprint products. The diagram below shows a typical example of a system for Improved Newsprint grades. |
PM: Paper Machine RCF Plant: Recycled Fibre Plant DIP Plant: Deinked Pulp Plant FPP: Fibre Preparation Plant Dirt Speck: A measure of one of the optical properties of DIP Sticky Count: A measure of the amount of sticky contaminents Kajaani: A measure of the Fibre length distribution in a pulp ISO Brightness: A measure of the brightness of a pulp |
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Pulping is normally done at a high consistency (15-20%). The pulp is then cleaned using 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 flotation stage to remove dirt and ink specks and then passes into Low consistency screening. This further removes small specks and importantly remove stickies that are harmful to the PM Fabrics and cause sheet breaks on the PM by building up on the cylinders and tearing the sheet as it passes over them. The stock is then thickened by the Disc Filter and Screw Press combination before entering the Disperger which helps to detach any break down residual stickies and dirt specks before a bleaching stage and a 2nd Flotation stage to remove the remaining dirt specks that have now been released from the fibres. This is followed by another thickening and final bleaching stage to to attain a high ISO brightness before storage. |
(This information is from suppliers listed in the Industry Directory. Contact PITA to have your company listed here) There are 8 other potential suppliers of relevant equipment/services. (This information is from suppliers listed in the Industry Directory Contact PITA to have your company listed here)
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