The Effect of Wood Alignment on Wood Grinding – Part 1: Properties of Pulp and Fines Revealed in the Grinding Mechanism
| Autor: | Airi Särkilahti, Sabine Heinemann, Erkki Saharinen, L. I. Salminen |
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| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Groundwood Environmental Engineering Materials science Fiber structure lcsh:Biotechnology Bioengineering 02 engineering and technology engineering.material 01 natural sciences lcsh:TP248.13-248.65 010608 biotechnology grinding angle Small particles Composite material wood alignment Waste Management and Disposal Fiber properties Pulp (paper) 021001 nanoscience & nanotechnology Grinding Wood alignment Grinding angle groundwood Norway spruce Pulverizer engineering fiber properties 0210 nano-technology |
| Zdroj: | Saharinen, E, Särkilahti, A, Salminen, L I & Heinemann, S 2016, ' The effect of wood alignment on wood grinding : Part 1: Properties of pulp and fines revealed in the grinding mechanism ', BioResources, vol. 11, no. 2, pp. 4201-4211 . < https://bioresources.cnr.ncsu.edu/resources/the-effect-of-wood-alignment-on-wood-grinding-part-1-properties-of-pulp-and-fines-revealed-in-the-grinding-mechanism/ > BioResources, Vol 11, Iss 2, Pp 4201-4211 (2016) |
| ISSN: | 1930-2126 |
| DOI: | 10.15376/biores.11.2.4201-4211 |
| Popis: | In industrial wood grinding, logs are pressed against a rotating stone, with the logs and fiber axis parallel to the axis of the stone. The objective of this study is to clarify how the wood alignment affects the process and pulp properties. In this research, wood blocks were fed into a laboratory grinder with various alignments in relation to the surface of the grinding stone. The effects of the alignment on the properties of the pulp and the amount and quality of fines were measured. A grinding mechanism was proposed. The results show that the pulp quality is very sensitive to the angle between the stone surface and the log. In gentle refining, the fiber structure is loosened by fatigue before it is bent on the surface; pressure pulses produce fibrillar material, and fibers develop toward having good bonding ability. In forced grinding, the process is “violent”, and the fiber wears and becomes crushed immediately on the surface into small particles with low bonding ability. |
| Databáze: | OpenAIRE |
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