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Studying conditions in the grinding zone. Final report; Hiontavyoehykkeen olojen tutkimus; Loppuraportti

Technical Report:

Abstract

One aim of the project was to investigate the effect of the surface temperatures of wood and stone in the grinding zone on production rate, specific energy consumption and the papermaking properties of the pulp. Another aim was to find new grinding materials and to study their suitability for groundwood production. The most important results were 1. A system was developed for measuring the temperature and vibration of the wood close to the grinding zone. The information obtained can be used to describe the state of the wood before defibration. 2. Reducing the flow of shower water onto the stone during pressure grinding allowed the temperature in the grinding zone to be raised. This led to pulp with lower freeness and greater strength. The production rate increased by 20 %. Groundwood strength characteristics could be developed more rapidly by raising the shower water temperature. 3. Extending the length of the infeed magazine allowed the temperature in the grinding zone to be raised and increased the strength of PGW by up to a third. 4. At the same specific energy consumption, the metal cylinder produced groundwood with greater tear strength than that obtained with a traditional ceramic stone. Raising the process  More>>
Authors:
Publication Date:
Oct 01, 1993
Product Type:
Technical Report
Report Number:
KCL-KUITU-28
Reference Number:
SCA: 320303; PA: FI-93:003305; EDB-94:013020; NTS-94:007762; ERA-19:004310; SN: 93001063846
Resource Relation:
Other Information: DN: FIBRE Research Programme; PBD: 1993
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; PAPER INDUSTRY; GRINDING; ELECTRIC POWER; ENERGY CONSUMPTION; WOOD; ENERGY CONSERVATION; GRINDING MACHINES; FIBERS; TEMPERATURE DEPENDENCE; SLURRIES; MECHANICAL PROPERTIES; 320303; EQUIPMENT AND PROCESSES
OSTI ID:
10111547
Research Organizations:
Finnish Pulp and Paper Research Inst., Espoo (Finland)
Country of Origin:
Finland
Language:
Finnish
Other Identifying Numbers:
Other: ON: DE94702103; TRN: FI9303305
Availability:
OSTI; NTIS
Submitting Site:
FI
Size:
15 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Lucander, M. Studying conditions in the grinding zone. Final report; Hiontavyoehykkeen olojen tutkimus; Loppuraportti. Finland: N. p., 1993. Web.
Lucander, M. Studying conditions in the grinding zone. Final report; Hiontavyoehykkeen olojen tutkimus; Loppuraportti. Finland.
Lucander, M. 1993. "Studying conditions in the grinding zone. Final report; Hiontavyoehykkeen olojen tutkimus; Loppuraportti." Finland.
@misc{etde_10111547,
title = {Studying conditions in the grinding zone. Final report; Hiontavyoehykkeen olojen tutkimus; Loppuraportti}
author = {Lucander, M}
abstractNote = {One aim of the project was to investigate the effect of the surface temperatures of wood and stone in the grinding zone on production rate, specific energy consumption and the papermaking properties of the pulp. Another aim was to find new grinding materials and to study their suitability for groundwood production. The most important results were 1. A system was developed for measuring the temperature and vibration of the wood close to the grinding zone. The information obtained can be used to describe the state of the wood before defibration. 2. Reducing the flow of shower water onto the stone during pressure grinding allowed the temperature in the grinding zone to be raised. This led to pulp with lower freeness and greater strength. The production rate increased by 20 %. Groundwood strength characteristics could be developed more rapidly by raising the shower water temperature. 3. Extending the length of the infeed magazine allowed the temperature in the grinding zone to be raised and increased the strength of PGW by up to a third. 4. At the same specific energy consumption, the metal cylinder produced groundwood with greater tear strength than that obtained with a traditional ceramic stone. Raising the process temperature brought an improvement of up to 50 % in the tear strength of groundwood produced using the metal cylinder. From the results, it would appear that the use of a metal cylinder in production of super-pressure groundwood (PGW-S) would give a clear competitive edge over thermomechanical pulping (TMP). The production costs for SC paper would be lower with PGW-S, and at the same time electricity costs in mechanical pulping could be cut by around FIM 20 million a year at a 200,000 t/a SC paper mill}
place = {Finland}
year = {1993}
month = {Oct}
}