Quality of Machined Wood Surfaces

Csanády, Etele; Magoss, Endre; Tolvaj, László

doi:10.1007/978-3-319-22419-0

Cited by 82 publications

(75 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Red hue change of poplar was much less intensive than that of the black locust. The degradation products of extractives mainly determine the alteration of red colour coordinate during photodegradation [13,32,33]. This is the reason for the great difference between the photodegradation behaviour of black locust and poplar.…”

Section: Resultsmentioning

confidence: 99%

“…The yellowing of wood during photodegradation is mainly generated by the degradation products of lignin [32]. The yellow colour of natural black locust changed only a little due to the UV exposure.…”

Section: Resultsmentioning

confidence: 99%

“…The total colour change is mainly determined by the change of the dominant component. In the photodegradation of wood, the yellowing is the dominant change since the red colour shift is usually much smaller" [32]. The dominant parameter can be the lightness in other cases [35].…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Colour stability of oil-heat treated black locust and poplar wood during short-term UV radiation

Németh

Tolvaj

Bak

et al. 2016

Journal of Photochemistry and Photobiology A: Chemistry

View full text Add to dashboard Cite

A B S T R A C TBlack locust (Robinia pseudoacacia L) samples with high extractive content and poplar (Populus Â euramericana cv. Pannónia) samples with low extractive content were chosen for the test. The specimens were thermally treated at 160 and 200 C in sunflower oil for 2, 4, and 6 h then irradiated by a strong UV emitter mercury lamp up to 36 h. The effects of thermal treatment and UV radiation were monitored by colour measurement. The results indicated that the extractives play an important role in the photodegradation of oil-heat treated wood. Thermal treatments reduced the lightness change effect of photodegradation. The oil-heat treated black locust samples showed similar photodegradation properties independently on the thermal pre-treatment time and temperature. The redness of oilheat treated black locust samples hardly changed during UV radiation proving the photostability of the thermally modified extractives. The redness change of poplar samples caused by UV radiation was partly determined by the temperature of thermal treatment (darkening and lightening also happened). The yellow colour change of the investigated samples showed that the lignin of thermally modified wood undergoes similar photodegradation as that of the untreated natural wood.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Colour stability of oil-heat treated black locust and poplar wood during short-term UV radiation

Németh

Tolvaj

Bak

et al. 2016

Journal of Photochemistry and Photobiology A: Chemistry

View full text Add to dashboard Cite

show abstract

“…The surface roughness after different ways of machining was investigated by Coatings et al (1999), Liptáková and Kúdela (2000), Gáborík and Žitný (2010), Gurau et al (2013), , Csanády et al (2015), Ugulino and Hernández (2016), Cool and Hernández (2016), and Kúdela et al (2016).…”

Section: Introductionmentioning

confidence: 99%

Quality of Silicone Coating on the Veneer Surfaces

2017

View full text Add to dashboard Cite

The surface quality of silicone resin coating on the veneer surface was evaluated. Silicone resins of various types (weakly, moderately, strongly hydrophobic, and hydrophilic resins) were applied on veneer and cured. The quality of the coatings was assessed according to the impact resistance of the surface and the resistance to cold liquids (acetic acid, citric acid, ethanol, sodium carbonate, sodium chloride, cleaner SAVO). The gloss value of silicone coatings on the veneer surface was determined from the aesthetic qualities. Radially sliced beech, oak, walnut, and ash veneers were tested. Veneer surface roughness was measured before and after modification with the silicone resins. The results obtained show that after modification by silicone resins, the surface roughness of the veneers was not significantly different from that of resin-free veneers. Impact resistance testing showed that intrusions on veneer surfaces with silicone coatings were free of cracks visible to the naked eye. Surface resistance to cold liquids on the surfaces with silicone coatings was lower if compared to that of commonly used coatings. In some cases, the surfaces showed strong damage, mostly without changing the structure of the coating, after only 10 min exposure to cold liquid. The gloss value of silicone coatings on wood veneers was graded as matte to semi-gloss.

show abstract

“…As madeiras apresentam uma ampla e variada coloração podendo apresentar tons amarelado, avermelhado, amarronzado entre outros. A cor da madeira é uma propriedade estética importante para a identificação, classificação e indicação de uso de uma determinada espécie; e quando associada à textura e ao desenho, afeta diretamente o valor comercial das madeiras (BARROS et al, 2014;CSANÁDY et al, 2015).…”

unclassified

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

Quality of Machined Wood Surfaces

Abstract: The use of general descriptive names, registered names, trademarks, service marks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use.

Cited by 82 publications

References 0 publications

Colour stability of oil-heat treated black locust and poplar wood during short-term UV radiation

Colour stability of oil-heat treated black locust and poplar wood during short-term UV radiation

Quality of Silicone Coating on the Veneer Surfaces

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

Contact Info

Product

Resources

About