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
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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}
}
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}
}