Características colorimétricas entre as seções anatômicas da madeira de muirapiranga (Brosimum sp.)

Atayde, Claudene Menezes; Gonçalez, Joaquim Carlos; Camargos, José Arlete Alves

doi:10.1590/s0104-77602011000200011

Cited by 20 publications

(16 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The lowest results tended to be presented in the transversal section in the samples of C. xanthocarpa, in the regions next to the pith and intermediate, in all samples of M. retorta, and in the intermediate region of P. peruviana. Atayde et al (2011) also observed it when characterizing the colorimetric parameters of the three sections of the wood of muirapiranga. As far as the regions of the disc are concerned, C. xanthocarpa and P. peruviana showed no significant statistical difference, such as the radial section of E. pyriformis.…”

Section: Factor Analysismentioning

confidence: 72%

“…These characteristics are influenced by several factors, especially the variation among species, among each tree of the same species, and within the same tree (SILVA et al, 2017). In addition, variation may occur according to the anatomical section in which the analysis was performed (ATAYDE et al, 2011;NISHINO et al, 2000). Therefore, in order to minimize interferences in determining wood color, correct and accurate reading of the CIE L*a*b* system is indicated, which can be made using colorimeters or spectrophotometers (MORI et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Wood Colorimetry of Native Species of Myrtaceae From a Araucaria Forest

Vieira

Silva

Santos

et al. 2019

View full text Add to dashboard Cite

Colorimetric parameters have potential to differentiate tree species through their wood type. Therefore, this can be used to aid the inspection of illegal trade. Thus, considering the need to identify species with precision and speed, this study aimed to explore the potential of these parameters in order to characterize wood of some species of native Myrtaceae from the Araucaria Forest: Campomanesia xanthocarpa Berg., Eugenia pyriformis Cambess., Myrcia retorta Cambess., and Plinia Peruviana (Poir.) Govaert. Twelve trees were collected randomly – three per species – for the removal of a disc at diameter at breast height (DBH). We took samples from three regions of the disc (next to the bark, intermediate and next to the pith) and analyzed them in three anatomical sections (transversal, radial and tangential) by the system CIE L*a*b* using a bench colorimeter. We analyzed the data based on the following criteria: test of means in order to differentiate species, quantitative factor analysis (considering the region of the disc and the anatomical section as factors), and principal components analysis (PCA). Then, we used the original spectrum and the values of parameters L*, a* and b* in order to verify the distribution of the species. The analysis determined that the species present different values for the colorimetric parameters. In addition, the factors region of the disc and anatomical section have specific influence for each species. Finally, the PCA indicated that only E. pyriformis differs from the others.

show abstract

Section: Factor Analysismentioning

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Wood Colorimetry of Native Species of Myrtaceae From a Araucaria Forest

Vieira

Silva

Santos

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The statistically similarity between axes differs from results observed in literature. Atayde et al (2011) observed different colors between tangential and radial sections of tropical wood Muirapiranga (Brosimum sp.). In that case, the only parameter statistically equal between sections was a*, but even then tangential cuts were more reddish than radial ones (with yellow tones) as b* values were higher in the radial axe than in the tangential.…”

Section: Resultsmentioning

confidence: 95%

Agrupamento de madeiras tropicais comerciais pela cor

Melo

Stangerlin

Menezzi

et al. 2019

RCA

View full text Add to dashboard Cite

This work aims to evaluate the color of 18 tropical species collected in sawmills located in the north region of Mato Grosso state, Brazil. In total, samples were produced from six trees for each species. The selected samples were sanded and evaluated by spectrophotometer, using the measurements system Cielab, to obtain the variables: brightness (L), the chromatic coordinates (a* and b*), saturation (C) and hue angle (h). There was no difference between the color of tangential or radial wood planes. The species could be grouped in 6 different classes based on the similarity of the pieces superficial colors. Grouping species by color is a possibility for marketing in local wood market, where often clients search for products based only in their aesthetic appearance. RESUMO: Este trabalho teve como objetivo realizar a caracterização colorimétrica de 18 espécies tropicais coletadas em serrarias da região norte do estado do Mato Grosso, Brasil. Ao todo, foram utilizadas madeiras provenientes de seis árvores para cada uma das espécies. As amostras selecionadas foram lixadas e avaliadas por meio do espectrofotocolorímetro, utilizando o sistema de medições Cielab, para obter as variáveis: claridade (L), coordenadas cromáticas (a* e b*), saturação (C) e ângulo de tinta (h). Não foi observada diferença entre a cor dos planos tangenciais e radiais das madeiras. As espécies puderam ser agrupadas em seis diferentes classes com base na similaridade da cor superficial das peças. O agrupamento de espécies pela cor é uma possibilidade de marketing para mercados locais, em que muitas vezes o cliente busca o produto com base na aparência estética.

show abstract

“…As madeiras de Eucalyptus robusta e Eucalyptus saligna apresentaram os menores h ab , ou seja, maior proximidade do eixo vermelho, caracterizando a cor mais avermelhada dessas espécies (Tabela 1). Em madeiras com valores de a* > 10, a tonalidade vermelha manifesta-se de forma mais pronunciada que a amarela (b*), predominando a nuance vermelha na formação da cor (ATAYDE et al, 2011;COSTA et al, 2011;GONÇALEZ et al, 2001). Sendo assim, obtem-se dois grupos de madeiras em termo de cor: madeiras amareladas (Corymbia citriodora e Eucalyptus camaldulensis) e madeiras avermelhadas (Eucalyptus pellita, Eucalyptus robusta, Eucalyptus saligna, Eucalyptus urophylla e Eucalyptus grandis.…”

Section: Espéciesunclassified

Efeito da densidade e da cor na molhabilidade da superfície de madeiras de eucalipto

Santos¹,

Garcia²

2019

Sci. For.

View full text Add to dashboard Cite

RESUMOO objetivo deste estudo foi investigar o efeito da densidade e da cor na molhabilidade da superfície de madeiras de eucaliptos. Foram estudadas sete espécies de eucalipto: Corymbia citriodora, Eucalyptus camaldulensis, Eucalyptus pellita, Eucalyptus robusta, Eucalyptus saligna, Eucalyptus urophylla e Eucalyptus grandis. As análises colorimétricas foram realizadas no espaço de cor L*a*b* CIE 1976. As medições de ângulo de contato foram realizadas pelo analisador de formato da gota DSA 100. As madeiras foram classificadas em três classes de densidade: muito alta, alta e baixa; e dois grupos de cor: amareladas e avermelhadas. As madeiras de Eucalyptus pellita e Eucalyptus urophyllla apresentaram as superfícies mais hidrofóbicas enquanto as madeiras de Eucalyptus camaldulensis e Eucalyptus grandis apresentaram as superfícies mais molháveis. As madeiras com maior luminosidade (L*) apresentaram maior molhabilidade (ex. Eucalyptus camaldulensis e Eucalyptus grandis); e as madeiras com maior tonalidade amarela (b*) e maior cromaticidade (C* ab ) na composição da cor apresentam superfícies mais hidrofóbicas (ex. Eucalyptus pellita e Eucalyptus urophylla). A densidade da madeira teve um efeito importante na fase inicial da molhabilidade, afetando pouco o ângulo de contato ao longo do tempo. As variáveis L*, b* e C* ab tiveram maior impacto na molhabilidade da superfície que a densidade.Palavras chaves: ângulo de contato, analisador do formato da gota, espaço de cor L*a*b* CIE 1976. ABSTRACTThis study aimed to evaluate the effect of density and color on the surface wettability of eucalypt woods. Seven eucalypt woods were studied: Corymbia citriodora, Eucalyptus camaldulensis, Eucalyptus pellita, Eucalyptus robusta, Eucalyptus saligna, Eucalyptus urophylla and Eucalyptus grandis. Color analyzes were performed in the CIE 1976 L*a*b* space color. Contact angle measurements were made by the drop shape analyzer DSA 100. The woods were classified into three density classes: very high, high and low; and two-color groups: yellowish and reddish. Eucalyptus pellita and Eucalyptus urophyllla woods exhibited the most hydrophobic surfaces while Eucalyptus camaldulensis and Eucalyptus grandis woods had the most wettable surfaces. Woods with higher luminosity (L*) had greater wettability (e.g. Eucalyptus camaldulensis and Eucalyptus grandis); and woods with greater yellow hue (b*) and higher chromaticity (C* ab ) in the color composition had more hydrophobic surfaces (e.g. Eucalyptus pellita and Eucalyptus urophylla). The wood density had an important effect in the initial phase of the wettability, affecting little the contact angle over time. The L*, b* and C* ab variables had greater impact on surface wettability than density.Keywords: contact angle, drop shape analyzer, CIE 1976 L*a*b* space color. INTRODUÇÃONos últimos anos, houve um aumento crescente na utilização de espécies de eucalipto na fabricação de produtos sólidos de madeira. Dentre os fatores que contribuem para o destaque do eucalipto, como matéria prima, estão a alta...

show abstract

Características colorimétricas entre as seções anatômicas da madeira de muirapiranga (Brosimum sp.)

Cited by 20 publications

References 5 publications

Wood Colorimetry of Native Species of Myrtaceae From a Araucaria Forest

Wood Colorimetry of Native Species of Myrtaceae From a Araucaria Forest

Agrupamento de madeiras tropicais comerciais pela cor

Efeito da densidade e da cor na molhabilidade da superfície de madeiras de eucalipto

Contact Info

Product

Resources

About