Screening of chemical pulp, revisiting technology options, and the state‐of‐the‐art equipment—A critical review

Abstract

Screening of pulp can be expressed as a process where solid contaminants are removed from a pulp slurry without an excessive loss of fibres of acceptable quality. The impurities originate from the feedstock, or they are generated during the transport, handling, storage, or pulping process. The most typical impurities include bark, fibre bundles or shives, knots, plastic, rubber, and sand. Moreover, there are also other objectives for screening, such as the improvement of the pulp quality, savings in bleaching chemical consumption, and protection of process equipment. In industrial applications, pulp screening is typically carried out with more than one screen for a more beneficial screening result. The pulp screening equipment can be divided into different types by the separation technique employed, such as atmospheric or pressurized screens, centrifugal screens, vibrating screens, etc. In addition, there are other types of related equipment that are common in the pulp screening process, such as knotters, refiners, and hydrocyclones. The main objective of this review is to discuss the advantages and disadvantages of modern screening equipment as well as introduce contemporary screening strategies for chemical pulp mills.

The Effect of Mechanical Pre-treatment of Reject Pulp as Raw Material for LOCC Mixture on Medium Paper Quality

“…Reject yang menumpuk di pembuangan akhir juga dapat mencemari lingkungan jika jumlahnya terus meningkat seiring dengan produksi yang dilakukan. Oleh karena itu, diperlukan inovasi agar reject pulp dapat diolah Kembali [16].…”