Conservation of Wood Artifacts

Landrey, Gregory J.; Unger, Achim; Unger, Wibke; Schniewind, Arno P.

doi:10.1007/978-3-662-06398-9

Cited by 210 publications

(164 citation statements)

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“…El adhesivo UF produjo los valores más altos de resistencia en la línea de adhesivo tanto para las muestras estabilizadas con PEG como para las no tratadas, superando en 50 % el límite impuesto por la norma. Estudios realizados con otras especies de madera tratada con PEG también reportan la formación de uniones fuertes utilizando adhesivos UF (Unger et al, 2001).…”

Section: Resultados Y Discusiónunclassified

EVALUACIÓN DE TRES ADHESIVOS EN LA FABRICACIÓN DE TABLEROS ENLISTONADOS DE Aspidosperma quebracho blanco ESTABILIZADO CON POLIETILENGLICOL

Sanabria¹,

Cayre²,

Frank³

2011

rchscfa

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RESUMENEn este trabajo se evaluó que tipo de adhesivo es factible de utilizar en la fabricación de tableros enlistonados de madera de Aspidosperma quebracho-blanco impregnada con polietilengliol (PEG). Se analizaron tres tipos de adhesivos: polivinil acetato (PVAc), urea-formaldehído (UF) y fenol-formaldehído (PF) para conformar los tableros. La calidad adhesiva se determinó mediante la resistencia de la línea de adhesivo en tableros fabricados con madera impregnada y sin impregnar. El uso de PEG como estabilizante de la madera de Aspidosperma quebracho-blanco no interfirió en el proceso de adhesión cuando se utilizaron adhesivos UF y PF. Con el adhesivo PVAc provocó una disminución (< 15 %) de la resistencia en la línea de adhesivo respecto de la madera sin impregnar. El adhesivo que mejor se comportó de acuerdo a la Norma Española UNE 56-777-92. Determinación de la resistencia en la línea de adhesivo, fue el UF. Los adhesivos PVAc y PF no lograron pasar las especificaciones mínimas de 10 N·mm -2 aún en los tableros fabricados con madera sin impregnar. ABSTRACTThis study analyzed what type of adhesive is most suitable for use in the manufacture of Aspidosperma quebracho-blanco wood blockboards impregnated with polyethylene glycol (PEG). Three types of adhesives that could potentially be used to form the boards were analyzed: polyvinyl acetate (PVAc), urea-formaldehyde (UF) and phenol-formaldehyde (PF). Bond quality was determined by the glue-line strength in boards made with impregnated and non-impregnated wood. The use of PEG as a stabilizer of Aspidosperma quebracho-blanco wood did not interfere in the adhesion process when UF and PF adhesives were tested. The PVAc adhesive decreased (<15%) the resistance of the glue line in comparison with the non-impregnated wood. The adhesive that performed the best according to the Spanish standard UNE 56-777-92, pertaining to the determination of glue-line strength, was the UF one. The PVAc and PF adhesives failed to reach the minimum specifications of 10 N·mm -2 even in those boards manufactured with non-impregnated wood.

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Section: Resultados Y Discusiónunclassified

EVALUACIÓN DE TRES ADHESIVOS EN LA FABRICACIÓN DE TABLEROS ENLISTONADOS DE Aspidosperma quebracho blanco ESTABILIZADO CON POLIETILENGLICOL

Sanabria¹,

Cayre²,

Frank³

2011

rchscfa

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“…In this context, a related wooden element should be included into the construction again by making inserts from wood materials belonging to the same tree species or by using metal fastening elements. Near that region, in areas where heavy fungal and insect damage occur, necessary rigidity and resistance can be achieved by using epoxy resin [47][48][49]. For determined insect damage and areas exposed to an advanced level of brown rot, resins of urea-formaldehyde and melamine formaldehyde, epoxy resins, as well as shellac use, will help obtain sufficient stiffness and resistance [50].…”

Section: Discussionmentioning

confidence: 99%

Assessing Ecotourism Potential of Traditional Wooden Architecture in Rural Areas: The Case of Papart Valley

Okan

Köse

Arifoğlu³

et al. 2016

Sustainability

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Abstract:The aim of this study is to reveal the resource values that the rural areas host, and with a very disciplined approach, to discuss opportunities to benefit from those values in terms of ecotourism practices specific to Papart Valley. As a first step in this study, we took an inventory of natural and cultural assets of Papart Valley in Eastern Black Sea Region, Artvin province. Then, a Strengths, Weaknesses, Opportunities and Threats (SWOT) analysis was conducted with the participation of all stakeholders and the current situation was analyzed in terms of ecotourism practices. In light of SWOT results, along with observed natural resource assets in the region, the traditional wooden houses were seen to have potential in terms of ecotourism and it was detected that there were a large number of wooden homes and home plans suitable for both the settlement of the local people and accommodation of guests. On the other hand, it was determined that there was a lack of information for sufficient protection and care of wooden houses, and despite their potential, there was a lack of regulations and positive attitudes towards accomodation businesses in traditional wooden houses. In order to eliminate these deficiencies, proposals for the protection of traditional building stock were developed, by first determining the causes of material degradation in the wooden houses. Also, to emphasize the worth and importance of these structures, dendrochronology studies were conducted in order to determine the antiquity of the structures and potentially to make them more attractive for eco-tourism.

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“…That contributes to the eradication of larvae as the larvae of the house longhorn beetle eat and stay mainly in the early wood (Unger, 2001). Early wood has large lumens and thin walls through which the microwaves can penetrate more quickly, at the same time the lumens may hold more steam.…”

Section: Impact Of Wood Moisture Depth and Directi-mentioning

confidence: 99%

“…In the case of cultural/historical wooden objects treated with various coatings, it is necessary to bear in mind that at temperatures above 60°C there is a risk of natural waxes softening and damages of adhesives, paints and varnishes on polichromated sculptures or furniture (Unger, 2001).…”

Section: Introduction Uvodmentioning

confidence: 99%

Effect of temperature on the eradication of house longhorn beetle larvae in wood by microwave treatment

Klinc¹,

Pohleven²

2017

Acta Silvae et Ligni

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In repressive protection of cultural/historical woodwork, microwaves have many advantages over conventional heating. The research's objective was to examine conditions for eradication of house longhorn beetle larvae (Hylotrupes bajulus) in spruce wood (Picea abies) using microwaves. Larvae, inserted at different depths of spruce blocks containing 12% and 42% of moisture, were exposed to microwaves. Two apparatuses were used; a 750W commercial microwave chamber and a newly developed horn antenna microwave device with the power of 800W and a frequency of 2.45GHz, for targeted radiation. We discovered that the inner part of wood warmed up quicker than the surface heated to 65°C. For successful suppression larvae in the wood need to be heated to 54.5°C, for 10 seconds. The necessary exposure time increases with increasing thickness of wood. The surface of wood containing more moisture is heated quicker, but increased moisture slows down the penetration of microwaves into the wood specimen. Therefore, larvae in wood of lower moisture (12%) died faster, both those 20mm under surface (1.5min) and those at 130 mm of depth (10.5min).Key words: wooden objects, repressive wood protection, microwaves, heating, wood moisture content, house longhorn beetle -Hylotrupes bajulus IZVLEČEKMikrovalovi imajo pri represivni zaščiti kulturnozgodovinskih lesenih predmetov veliko prednosti pred konvencionalnim gretjem. Namen raziskave je preučiti pogoje uničenja larv hišnega kozlička (Hylotrupes bajulus) v smrekovem lesu (Picea abies) z uporabo mikrovalov. Mikrovalovom smo izpostavili larve, vstavljene različno globoko v smrekove blokce z 12 % in 42 % vlažnostjo lesa. Uporabili smo komercialno mikrovalovno komoro z močjo 750 W in razvito mikrovalovno napravo z rogasto anteno moči 800 W s frekvenco 2,45 GHz, za usmerjeno obsevanje. Ugotovili smo, da se notranjost lesa bolj segreva kot površina, ki smo jo segrevali do 65 °C. Za uspešno zatiranje je treba larvo v lesu segreti na temperaturo 54,5 °C za 10 sekund. Z debelino lesa se podaljšuje čas izpostavitve. Vlažnejši les se hitreje segreva, vendar mikrovalovi počasneje prodirajo skozi volumen. Zato so larve v lesu z nižjo vlažnostjo (12 %) hitreje poginile, tako 20 mm pod površino lesa (1,5 minute) kot v tudi globini 130 mm (10,5 minute).Ključne besede: leseni predmeti, represivna zaščita lesa, mikrovalovi, segrevanje, vlažnost lesa, hišni kozliček -Hylotrupes bajulus GDK 413.3+453(045)=111 Prispelo / Received:

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Conservation of Wood Artifacts

Cited by 210 publications

References 0 publications

EVALUACIÓN DE TRES ADHESIVOS EN LA FABRICACIÓN DE TABLEROS ENLISTONADOS DE Aspidosperma quebracho blanco ESTABILIZADO CON POLIETILENGLICOL

EVALUACIÓN DE TRES ADHESIVOS EN LA FABRICACIÓN DE TABLEROS ENLISTONADOS DE Aspidosperma quebracho blanco ESTABILIZADO CON POLIETILENGLICOL

Assessing Ecotourism Potential of Traditional Wooden Architecture in Rural Areas: The Case of Papart Valley

Effect of temperature on the eradication of house longhorn beetle larvae in wood by microwave treatment

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