The water absorption of sapwood and heartwood of Scots pine and Norway spruce heat-treated at 170 °C, 190 °C, 210 °C and 230 °C

Sini Metsä-Kortelainen (Corresponding Author), Toni Antikainen, Pertti Viitaniemi

Research output: Contribution to journalArticleScientificpeer-review

149 Citations (Scopus)

Abstract

Heat-treatment changes the chemical and physical properties of wood. Wood polymers are degraded, dimensional stability is enhanced, equilibrium moisture content is lowered, colour darkens and biological durability is increased. The properties of heat-treated wood have been researched considerably, but the differences between sapwood and heartwood have not been reported separately. In this research, water absorption differences between sapwood and heartwood of Scots pine and Norway spruce heat-treated at temperatures 170 °C, 190 °C, 210 °C and 230 °C were investigated. The results were compared to industrially kiln-dried reference samples. Water absorption was determined with a floating test based on the EN 927-5 standard. The heartwood of both wood species absorbed less water than sapwood. Heat-treatment evidently decreased the water absorption of spruce and pine heartwood. The higher the heat-treating temperature, the lower the amount of absorbed moisture. However, a very interesting exception was pine sapwood, whose water absorption actually increased with heat-treatment after the three lowest heat-treatment temperatures compared to the reference material. Water absorption did not decrease until the heat-treatment temperature was 230 °C.
Original languageEnglish
Pages (from-to)192-197
Number of pages6
JournalHolz als Roh- und Werkstoff
Volume64
Issue number3
DOIs
Publication statusPublished - 2006
MoE publication typeA1 Journal article-refereed

Fingerprint

heartwood
sapwood
Water absorption
Pinus sylvestris
Picea abies
heat treatment
Wood
heat
Heat treatment
temperature
Moisture
water
Pinus
wood physical properties
Low temperature operations
dimensional stability
kilns
Dimensional stability
Kilns
durability

Keywords

  • heartwood
  • heat
  • heat-treatment
  • moisture
  • Norway spruce
  • sapwood
  • Scots pine
  • temperature
  • water absorption
  • wood

Cite this

@article{114a6fb46a014f779ca96a206c865dc3,
title = "The water absorption of sapwood and heartwood of Scots pine and Norway spruce heat-treated at 170 °C, 190 °C, 210 °C and 230 °C",
abstract = "Heat-treatment changes the chemical and physical properties of wood. Wood polymers are degraded, dimensional stability is enhanced, equilibrium moisture content is lowered, colour darkens and biological durability is increased. The properties of heat-treated wood have been researched considerably, but the differences between sapwood and heartwood have not been reported separately. In this research, water absorption differences between sapwood and heartwood of Scots pine and Norway spruce heat-treated at temperatures 170 °C, 190 °C, 210 °C and 230 °C were investigated. The results were compared to industrially kiln-dried reference samples. Water absorption was determined with a floating test based on the EN 927-5 standard. The heartwood of both wood species absorbed less water than sapwood. Heat-treatment evidently decreased the water absorption of spruce and pine heartwood. The higher the heat-treating temperature, the lower the amount of absorbed moisture. However, a very interesting exception was pine sapwood, whose water absorption actually increased with heat-treatment after the three lowest heat-treatment temperatures compared to the reference material. Water absorption did not decrease until the heat-treatment temperature was 230 °C.",
keywords = "heartwood, heat, heat-treatment, moisture, Norway spruce, sapwood, Scots pine, temperature, water absorption, wood",
author = "Sini Mets{\"a}-Kortelainen and Toni Antikainen and Pertti Viitaniemi",
note = "Project code: 978",
year = "2006",
doi = "10.1007/s00107-005-0063-y",
language = "English",
volume = "64",
pages = "192--197",
journal = "European Journal of Wood and Wood Products",
issn = "0018-3768",
publisher = "Springer",
number = "3",

}

The water absorption of sapwood and heartwood of Scots pine and Norway spruce heat-treated at 170 °C, 190 °C, 210 °C and 230 °C. / Metsä-Kortelainen, Sini (Corresponding Author); Antikainen, Toni; Viitaniemi, Pertti.

In: Holz als Roh- und Werkstoff, Vol. 64, No. 3, 2006, p. 192-197.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - The water absorption of sapwood and heartwood of Scots pine and Norway spruce heat-treated at 170 °C, 190 °C, 210 °C and 230 °C

AU - Metsä-Kortelainen, Sini

AU - Antikainen, Toni

AU - Viitaniemi, Pertti

N1 - Project code: 978

PY - 2006

Y1 - 2006

N2 - Heat-treatment changes the chemical and physical properties of wood. Wood polymers are degraded, dimensional stability is enhanced, equilibrium moisture content is lowered, colour darkens and biological durability is increased. The properties of heat-treated wood have been researched considerably, but the differences between sapwood and heartwood have not been reported separately. In this research, water absorption differences between sapwood and heartwood of Scots pine and Norway spruce heat-treated at temperatures 170 °C, 190 °C, 210 °C and 230 °C were investigated. The results were compared to industrially kiln-dried reference samples. Water absorption was determined with a floating test based on the EN 927-5 standard. The heartwood of both wood species absorbed less water than sapwood. Heat-treatment evidently decreased the water absorption of spruce and pine heartwood. The higher the heat-treating temperature, the lower the amount of absorbed moisture. However, a very interesting exception was pine sapwood, whose water absorption actually increased with heat-treatment after the three lowest heat-treatment temperatures compared to the reference material. Water absorption did not decrease until the heat-treatment temperature was 230 °C.

AB - Heat-treatment changes the chemical and physical properties of wood. Wood polymers are degraded, dimensional stability is enhanced, equilibrium moisture content is lowered, colour darkens and biological durability is increased. The properties of heat-treated wood have been researched considerably, but the differences between sapwood and heartwood have not been reported separately. In this research, water absorption differences between sapwood and heartwood of Scots pine and Norway spruce heat-treated at temperatures 170 °C, 190 °C, 210 °C and 230 °C were investigated. The results were compared to industrially kiln-dried reference samples. Water absorption was determined with a floating test based on the EN 927-5 standard. The heartwood of both wood species absorbed less water than sapwood. Heat-treatment evidently decreased the water absorption of spruce and pine heartwood. The higher the heat-treating temperature, the lower the amount of absorbed moisture. However, a very interesting exception was pine sapwood, whose water absorption actually increased with heat-treatment after the three lowest heat-treatment temperatures compared to the reference material. Water absorption did not decrease until the heat-treatment temperature was 230 °C.

KW - heartwood

KW - heat

KW - heat-treatment

KW - moisture

KW - Norway spruce

KW - sapwood

KW - Scots pine

KW - temperature

KW - water absorption

KW - wood

U2 - 10.1007/s00107-005-0063-y

DO - 10.1007/s00107-005-0063-y

M3 - Article

VL - 64

SP - 192

EP - 197

JO - European Journal of Wood and Wood Products

JF - European Journal of Wood and Wood Products

SN - 0018-3768

IS - 3

ER -