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Modelling the grinding process. Final report; Hionnan mallintaminen; Loppuraportti

Technical Report:

Abstract

The aim of the research is to make the grinding process more energy-efficient. The basic events of grinding must first be understood and be presented in a mathematical way so that their relevance can be properly tested. Two parallel approaches were adopted in this study: 1. To seek the most fundamental physical correlations between stone grinding surface, on the one hand and wood structure, fatigue, efficiency, production rate and pulp quality on the other. 2. To seek, without going into the details of grinding, the correlations between stone parameters, on the one hand, and pulp quality and production rate on the other. A method involving lasers has been developed for making measurements of the grindstone surface. The surface profiles have been found to have two important properties which cause fatigue in the wood and remove fibres. These properties have been described using two parameters, and it has been shown experimentally that the parameters change in a logical way during the sharpening period, correlate with quality characteristics and can be justified theoretically. The values of the parameters are linked to pulp analyses performed during laboratory grinding and to the energy consumed by the grinder during production-scale grinding. A simple one-dimensional model  More>>
Authors:
Bjoerkqvist, T [1] 
  1. Tampere Univ. of Technology, Tampere (Finland)
Publication Date:
Oct 01, 1993
Product Type:
Technical Report
Report Number:
KCL-KUITU-25
Reference Number:
SCA: 320303; PA: FI-93:003302; EDB-94:013017; NTS-94:007759; ERA-19:004307; SN: 93001063843
Resource Relation:
Other Information: DN: FIBRE Research Programme; PBD: 1993
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; GRINDING; MATHEMATICAL MODELS; PAPER INDUSTRY; ENERGY CONSERVATION; WOOD; GRINDING MACHINES; FIBERS; SIMULATION; BENCH-SCALE EXPERIMENTS; FIELD TESTS; 320303; EQUIPMENT AND PROCESSES
OSTI ID:
10111529
Research Organizations:
Finnish Pulp and Paper Research Inst., Espoo (Finland)
Country of Origin:
Finland
Language:
Finnish
Other Identifying Numbers:
Other: ON: DE94702100; TRN: FI9303302
Availability:
OSTI; NTIS
Submitting Site:
FI
Size:
39 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Bjoerkqvist, T. Modelling the grinding process. Final report; Hionnan mallintaminen; Loppuraportti. Finland: N. p., 1993. Web.
Bjoerkqvist, T. Modelling the grinding process. Final report; Hionnan mallintaminen; Loppuraportti. Finland.
Bjoerkqvist, T. 1993. "Modelling the grinding process. Final report; Hionnan mallintaminen; Loppuraportti." Finland.
@misc{etde_10111529,
title = {Modelling the grinding process. Final report; Hionnan mallintaminen; Loppuraportti}
author = {Bjoerkqvist, T}
abstractNote = {The aim of the research is to make the grinding process more energy-efficient. The basic events of grinding must first be understood and be presented in a mathematical way so that their relevance can be properly tested. Two parallel approaches were adopted in this study: 1. To seek the most fundamental physical correlations between stone grinding surface, on the one hand and wood structure, fatigue, efficiency, production rate and pulp quality on the other. 2. To seek, without going into the details of grinding, the correlations between stone parameters, on the one hand, and pulp quality and production rate on the other. A method involving lasers has been developed for making measurements of the grindstone surface. The surface profiles have been found to have two important properties which cause fatigue in the wood and remove fibres. These properties have been described using two parameters, and it has been shown experimentally that the parameters change in a logical way during the sharpening period, correlate with quality characteristics and can be justified theoretically. The values of the parameters are linked to pulp analyses performed during laboratory grinding and to the energy consumed by the grinder during production-scale grinding. A simple one-dimensional model of the basic grinding phenomena has been constructed. A more detailed model involving partial differential equations depicting the grinding phenomena inside the wood above the grinding zone has been verified to some extent against data obtained from laboratory grinding. The result obtained during simulation are basically the same as those obtained by measurement. A more complete model of the basic grinding phenomena is now being constructed}
place = {Finland}
year = {1993}
month = {Oct}
}