How to evaluate the kraft pulp brightness stability

Research output: Contribution to conferenceConference articleScientificpeer-review

Abstract

Proper accelerated ageing methods (dry vs. humid heat) and applicability of UV-Vis reflectance spectroscopy for brightness stability studies of kraft pulps were considered. It was shown that UV-Vis reflectance spectroscopy can be used as a very sensitive and simple method to follow the degradation of HexA during thermal ageing treatments of kraft pulps. It was confirmed that the dry heat treatment (105°C, 4h), often used for eucalyptus kraft pulps, does not fully reveal the contribution of HexA to brightness reversion, and may thus lead to erroneous
conclusions regarding the factors affecting brightness stability. According to UV-Vis measurements, dry heat treatment with prolonged reaction time leads to the
degradation of HexA, but the actual color forming reactions of HexA’s degradation products probably do not take place in dry conditions.
Original languageEnglish
Number of pages7
Publication statusPublished - 2007
MoE publication typeNot Eligible
Event3rd International Colloquium on Eucalyptus Pulp - Belo Horizonte, Brazil
Duration: 4 Mar 20077 Jul 2007
Conference number: 3

Conference

Conference3rd International Colloquium on Eucalyptus Pulp
CountryBrazil
CityBelo Horizonte
Period4/03/077/07/07

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kraft pulp
ultraviolet-visible spectroscopy
heat treatment
heat
degradation
Eucalyptus
color
methodology
reflectance spectroscopy

Cite this

Liitiä, T., & Tamminen, T. (2007). How to evaluate the kraft pulp brightness stability. Paper presented at 3rd International Colloquium on Eucalyptus Pulp, Belo Horizonte, Brazil.
Liitiä, Tiina ; Tamminen, Tarja. / How to evaluate the kraft pulp brightness stability. Paper presented at 3rd International Colloquium on Eucalyptus Pulp, Belo Horizonte, Brazil.7 p.
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abstract = "Proper accelerated ageing methods (dry vs. humid heat) and applicability of UV-Vis reflectance spectroscopy for brightness stability studies of kraft pulps were considered. It was shown that UV-Vis reflectance spectroscopy can be used as a very sensitive and simple method to follow the degradation of HexA during thermal ageing treatments of kraft pulps. It was confirmed that the dry heat treatment (105°C, 4h), often used for eucalyptus kraft pulps, does not fully reveal the contribution of HexA to brightness reversion, and may thus lead to erroneousconclusions regarding the factors affecting brightness stability. According to UV-Vis measurements, dry heat treatment with prolonged reaction time leads to thedegradation of HexA, but the actual color forming reactions of HexA’s degradation products probably do not take place in dry conditions.",
author = "Tiina Liiti{\"a} and Tarja Tamminen",
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note = "3rd International Colloquium on Eucalyptus Pulp ; Conference date: 04-03-2007 Through 07-07-2007",

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Liitiä, T & Tamminen, T 2007, 'How to evaluate the kraft pulp brightness stability' Paper presented at 3rd International Colloquium on Eucalyptus Pulp, Belo Horizonte, Brazil, 4/03/07 - 7/07/07, .

How to evaluate the kraft pulp brightness stability. / Liitiä, Tiina; Tamminen, Tarja.

2007. Paper presented at 3rd International Colloquium on Eucalyptus Pulp, Belo Horizonte, Brazil.

Research output: Contribution to conferenceConference articleScientificpeer-review

TY - CONF

T1 - How to evaluate the kraft pulp brightness stability

AU - Liitiä, Tiina

AU - Tamminen, Tarja

PY - 2007

Y1 - 2007

N2 - Proper accelerated ageing methods (dry vs. humid heat) and applicability of UV-Vis reflectance spectroscopy for brightness stability studies of kraft pulps were considered. It was shown that UV-Vis reflectance spectroscopy can be used as a very sensitive and simple method to follow the degradation of HexA during thermal ageing treatments of kraft pulps. It was confirmed that the dry heat treatment (105°C, 4h), often used for eucalyptus kraft pulps, does not fully reveal the contribution of HexA to brightness reversion, and may thus lead to erroneousconclusions regarding the factors affecting brightness stability. According to UV-Vis measurements, dry heat treatment with prolonged reaction time leads to thedegradation of HexA, but the actual color forming reactions of HexA’s degradation products probably do not take place in dry conditions.

AB - Proper accelerated ageing methods (dry vs. humid heat) and applicability of UV-Vis reflectance spectroscopy for brightness stability studies of kraft pulps were considered. It was shown that UV-Vis reflectance spectroscopy can be used as a very sensitive and simple method to follow the degradation of HexA during thermal ageing treatments of kraft pulps. It was confirmed that the dry heat treatment (105°C, 4h), often used for eucalyptus kraft pulps, does not fully reveal the contribution of HexA to brightness reversion, and may thus lead to erroneousconclusions regarding the factors affecting brightness stability. According to UV-Vis measurements, dry heat treatment with prolonged reaction time leads to thedegradation of HexA, but the actual color forming reactions of HexA’s degradation products probably do not take place in dry conditions.

M3 - Conference article

ER -

Liitiä T, Tamminen T. How to evaluate the kraft pulp brightness stability. 2007. Paper presented at 3rd International Colloquium on Eucalyptus Pulp, Belo Horizonte, Brazil.