Development and optimisation of disk filter for high consistency paper stock dewatering and fiber recovery

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The last 10 years have seen an important shift in the production of papers and boards in Canada. The sharp**demand decline for printing and writing grades lead to several mill closures but the tissue and packaging**sectors of the industry rather see a strong and persistent increase in demand. The industry must also face the**challenge of reducing energy and water consumption while increasing the quality of its products. There is thus**a strong industrial need for efficient equipment, both to first prepare the pulp and then produce the required**paper and board grades.**Kadant is a leading supplier of stock preparation and approach flow systems designed to produce high-quality**white and brown paper grades, with extended expertise in the use of recycled fiber pulps. The company started**the development of a disk filter that can process a fiber slurry with a high solid proportion (high consistency).**Innofibre plays a leading role in this development. A pilot scale unit of the disk filter, specially designed for**development work, is located at Innofibre and joint efforts by Kadant and Innofibre already led to significant**advances.**The goal of the present research proposal is to pursue the development of the disk filter in the modern context**of the pulp and paper industry. This project will first focus on white water fiber recovery and then further the**development of the disk filter to the thickening of relatively high consistency pulp (larger than 1 % in solid**content). These objectives are in line with recent shifts in the Canadian pulp and paper industry towards the**production of linerboard and the increased mill production capacity, both phenomena requiring better**dewatering capacity and water recycling.