Instytut Papiernictwa i Poligrafii
Stały URI zbioruhttp://hdl.handle.net/11652/12
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Pozycja Gravity drainage kinetics of papermaking fibrous suspensions(Polska Akademia Nauk, 2014) Przybysz, Piotr; Kuncewicz, Czesław; Rieger, FrantišekThe study analyses application possibilities of filtration and thickening models in evaluation of papermaking suspension drainage rate. The authors proposed their own method to estimate the drainage rate on the basis of an existing Ergun capillary model of liquid flow through a granular material. The proposed model was less sensitive to porosity changes than the Ergun model. An empirical verification proved robustness of the proposed approach. Taking into account discrepancies in the published data concerning how the drainage velocity of papermaking suspension is defined, this study examines which of the commonly applied models matches experimental results the best.Pozycja Development Directions of the Raw Material Base of the Paper Industry with regard to the Sustainable Development Concept(Institute of Biopolymers and Chemical Fibres, 2014) Przybysz, Piotr; Buzała, KamilaPaper is one of the most common mass products used nowadays. Present paper consumption has reached almost 400 million metric tons globally. Such a huge volume of production requires stable and continuous supply of raw materials in the form of wood and recovered paper. This article presents the current situation in the field of raw materials supply for the paper industry. Firstly it needs to be underlined that in the 21st century recovered paper has already become as equally an important raw material as wood, and soon the production of paper from secondary fibre pulps may match the volume of production of paper from virgin pulps. Moreover a detailed insight into future challenges and possibilities of broadening the raw materials base for the production of paper is also given. Finally the best possible methods to ensure a constant supply of wood and recovered paper for industry are also featured.Pozycja A New Device for Characterisation of the Drainage Kinetics of Fibrous Suspensions Under Gravity(The Journal of Committee of Chemical and Process of Polish Academy of Sciences, 2014) Przybysz, Piotr; Kuncewicz, Czesław; Rieger, FrantišekGravity dewatering of fibrous suspension is one of basic technological operations in paper production process. Although there are numerous methods to determine dewatering of such suspensions, none of them can measure undisturbed flow of removed water. In the paper the idea and design of a new apparatus for the determination of drainage rate of fibrous suspensions is presented. The apparatus differs from other known devices by minimisation of filtrate flow resistance in the outlet part of the equipment. In the second part of the paper measurements of the drainage rate have been presented. The flow resistance of the fluid through the bottom wire screen in the device was determined. The calculated flow resistance will be used in the developed model of dynamic drainage of fibrous suspensions, which will be discussed in our following paper (Przybysz et al., 2014).