Colour responses of Eucalyptus grandis wood to the Brazilian process of thermal modification
A study of colour assessment, using the CIEL*a*b* system, was conducted with samples of Eucalyptus grandis wood thermally treated by the Brazilian industrial process of thermal modification, VAP HolzSysteme®, at three different temperatures, i.e. 140, 160 and 180 °C. Previous to the treatment, the s...
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| Abstract | A study of colour assessment, using the CIEL*a*b* system, was conducted with samples of Eucalyptus grandis wood thermally treated by the Brazilian industrial process of thermal modification, VAP HolzSysteme®, at three different temperatures, i.e. 140, 160 and 180 °C. Previous to the treatment, the samples were classified into three groups according to their distance to the wood pith, on the radial direction. All thermally modified samples presented a noticeable colour change, confirmed by high values of ΔE*. As the intensity of the treatment increased, the eucalypt samples presented an increase of red colour tone (a*) (up to 160 ºC) and a decrease of colour lightness (L*). Significant colour differences were found among the classified groups, for both untreated and thermally modified samples. The eucalypt samples groups showed different colour responses when thermally treated at 140 and 160 ºC. At 180 ºC the groups didn’t show a significant colour response variation. |
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| AbstractList | A study of colour assessment, using the CIEL*a*b* system, was conducted with samples of Eucalyptus grandis wood thermally treated by the Brazilian industrial process of thermal modification, VAP HolzSysteme®, at three different temperatures, i.e. 140, 160 and 180 °C. Previous to the treatment, the samples were classified in three groups according to their distance to the wood pith, on the radial direction. All thermally modified samples presented a noticeable colour change, confirmed by high values of ΔE*. As the intensity of the treatment increased, the eucalypt samples presented an increase of red colour tone (a*) (up to 160 ºC) and a decrease of colour lightness (L*). Significant colour differences were found among the classified groups, for both untreated and thermally modified samples. The eucalypt samples groups showed different colour responses when thermally treated at 140 and 160 ºC. At 180 ºC the groups didn’t show a significant colour response variation. A study of colour assessment, using the CIEL*a*b* system, was conducted with samples of Eucalyptus grandis wood thermally treated by the Brazilian industrial process of thermal modification, VAP HolzSysteme®, at three different temperatures, i.e. 140, 160 and 180 °C. Previous to the treatment, the samples were classified into three groups according to their distance to the wood pith, on the radial direction. All thermally modified samples presented a noticeable colour change, confirmed by high values of ΔE*. As the intensity of the treatment increased, the eucalypt samples presented an increase of red colour tone (a*) (up to 160 ºC) and a decrease of colour lightness (L*). Significant colour differences were found among the classified groups, for both untreated and thermally modified samples. The eucalypt samples groups showed different colour responses when thermally treated at 140 and 160 ºC. At 180 ºC the groups didn’t show a significant colour response variation. |
| Author | Batista, Djeison Cesar Griebeler, Carolina Gomes de Oliveira Rodríguez, Carmen Iglesias Matos, Jorge Luis Monteiro de Muniz, Graciela Ines Bolzón de Nisgoski, Silvana |
| AuthorAffiliation | University of Lleida Federal University of Espírito Santo Federal University of Paraná |
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| Author_xml | – sequence: 1 givenname: Carolina Gomes de Oliveira surname: Griebeler fullname: Griebeler, Carolina Gomes de Oliveira – sequence: 2 givenname: Jorge Luis Monteiro de surname: Matos fullname: Matos, Jorge Luis Monteiro de – sequence: 3 givenname: Graciela Ines Bolzón de surname: Muniz fullname: Muniz, Graciela Ines Bolzón de – sequence: 4 givenname: Silvana surname: Nisgoski fullname: Nisgoski, Silvana – sequence: 5 givenname: Djeison Cesar surname: Batista fullname: Batista, Djeison Cesar – sequence: 6 givenname: Carmen Iglesias surname: Rodríguez fullname: Rodríguez, Carmen Iglesias |
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| Keywords | VAP HolzSysteme Colorimetry heat treatment eucalypt wood wood grading |
| Language | English |
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| Title | Colour responses of Eucalyptus grandis wood to the Brazilian process of thermal modification |
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