Durability of five native Argentine wood species of the genera Prosopis and Acacia decayed by rot fungi and its relationship with extractive content

There are many factors that affect the formaldehyde emission from plywood such as wood species and moisture content. As for wood species, colour appearance was found to affect significantly the formaldehyde emission. Therefore, the effects of tropical wood species with different colour on the formaldehyde emission of manufactured plywood were studied and determined by the perforator and desiccator method. Veneer of seven wood species, namely Mempisang, Kedondong, Penarahan, Keledang, Rengas, Melembu and Ludai were chosen as samples. 3-ply plywood were manufactured using urea formaldehyde as binders. The formaldehyde emission of the produced plywood was tested using perforator method (EN 120) and desiccator method (MS 1787: Part 15). Colour of the wood veneers were measured using Brightness & Colour Meter through CIE L*a*b* system. Relationship between the wood colour and formaldehyde emission were determined. The results revealed that the formaldehyde emission increased as the lightness (L*) of the wood samples increased. This may be due to higher extractive content in darker coloured wood (low lightness) that acts as formaldehyde scavenger.

Download Full-text

Relationship among extractives, lignin and holocellulose contents with performance index of seven wood species used for bows of string instruments

IAWA Journal ◽

10.1163/22941932-90000085 ◽

2012 ◽

Vol 33 (2) ◽

pp. 141-149 ◽

Cited By ~ 2

Author(s):

Eduardo Luiz Longui ◽

Iris Brémaud ◽

Francides Gomes da Silva Júnior ◽

Daniel Romeu Lombardi ◽

Edenise Segala Alves

Keyword(s):

Wood Species ◽

Modulus Of Elasticity ◽

Performance Index ◽

Chemical Constituents ◽

Wood Quality ◽

Wood Properties ◽

Bending Stiffness ◽

Extractive Content ◽

String Instruments ◽

Caesalpinia Echinata

In this paper we investigate the influence of extractives, lignin and holocellulose contents on performance index (PI) of seven woods used or tested for violin bows. Woods with higher values of this index (PI = √MOE/ρ, where MOE is modulus of elasticity and ρ is density) have a higher bending stiffness at a given mass, which can be related to bow wood quality. Extractive content was negatively correlated with PI in Caesalpinia echinata, Handroanthus sp. and Astronium lecointei. In C. echinata holocellulose was positively correlated with PI. These results need to be further explored with more samples and by testing additional wood properties. Although the chemical constituents could provide an indication of quality, it is not possible to establish appropriate woods for bows solely by examining their chemical constituents.

Download Full-text

Natural resistance of eight Brazilian wood species from the region Caatinga determined by an accelerated laboratory decay test against four fungi

Holzforschung ◽

10.1515/hf-2018-0051 ◽

2019 ◽

Vol 73 (2) ◽

pp. 151-154 ◽

Cited By ~ 2

Author(s):

Marcelo F. da Silveira ◽

Fernando N. Gouveia ◽

Alessandro C.O. Moreira ◽

José Roberto V. Oliveira ◽

Anna Sofya V.S. Silva ◽

...

Keyword(s):

Wood Species ◽

Brown Rot ◽

Decay Resistance ◽

Standard Test ◽

Test Method ◽

White Rot ◽

Natural Resistance ◽

Extractive Content ◽

Pycnoporus Sanguineus ◽

Decay Test

AbstractNatural resistance of eight wood species from Caatinga, an exclusive Brazilian biome, was evaluated according to [ASTM Standard (2005) D 2017-05. Standard test method of accelerated laboratory test of natural decay resistance of woods.]. Samples were exposed to white rot (WR) and brown rot (BR) fungi, namely toTrametes versicolor(WR),Pycnoporus sanguineus(WR), Gloeophyllum trabeum(BR) andGloeophyllum striatum(BR). Weight loss, specific gravity and extractive content of each wood species were evaluated.Diptychandra aurantiaca,Pterodon abruptusandTerminalia fagifoliawere classified as “highly resistant”, whileT. fagifoliawas “resistant” toT. versicoloronly.Machaerium acutifoliumwas resistant to all fungi.Aspidosperma multiflorumwas resistant to WR fungi andCombretum glaucocarpumto a BR fungus. The speciesPityrocarpa moniliformisandSwartzia psilonemawere moderately resistant.

Download Full-text

Effect of extractive content on the thermal stability of two wood species from Brazil

Maderas Ciencia y tecnología ◽

10.4067/s0718-221x2016005000039 ◽

2016 ◽

pp. 0-0 ◽

Cited By ~ 5

Author(s):

Matheus Poletto

Keyword(s):

Thermal Stability ◽

Wood Species ◽

Extractive Content ◽

Thermal Stability Of

Download Full-text

Role of Wood Extractives in Black Liquor Corrosiveness

CORROSION ◽

10.5006/1.3279901 ◽

2006 ◽

Vol 62 (10) ◽

pp. 911-917 ◽

Cited By ~ 4

Author(s):

P. E. Hazlewood ◽

P. M. Singh ◽

J. S. Hsieh

Keyword(s):

Carbon Steel ◽

Wood Species ◽

Paper Industry ◽

Black Liquor ◽

Wood Chip ◽

Pulp Mill ◽

Kraft Pulping ◽

Extractive Content ◽

Operational Parameters ◽

Black Liquors

Abstract In the pulp and paper industry, variability in the process and wood source may result in highly corrosive waste liquors, called black liquors, from the Kraft pulping process. Prior research has demonstrated corrosion rates of carbon steel in pulp mill equipment ranging from <0.03 mm/y to >2.54 mm/y, depending on the wood species pulped. In this study wood species-dependent corrosion is confirmed and age-dependent corrosion is investigated as a function of organic extractive content. The composition of the organic portion of black liquor depends largely on the wood species used. Organic components come from extractives in the wood chips or are generated from the degradation of lignin and other wood constituents during the pulping process. Depending upon the wood species used, some black liquor constituents have been identified to increase the corrosiveness of black liquors whereas others may act as corrosion inhibitors. Our research demonstrates the importance of operational parameters for wood species and wood chip usage and delivery to downstream process corrosion. Further, results show the importance of water-extracted organics in wood, such as long chain fatty acids, using a novel methodology for the separation of extractives and lignin breakdown products in the testing of black liquor corrosiveness with carbon steel A516-Grade 70 (UNS K02700).

Download Full-text

Topochemistry of heat-treated and N-methylol melamine-modified wood of koto (Pterygota macrocarpa K. Schum.) and limba (Terminalia superba Engl. et. Diels)

Holzforschung ◽

10.1515/hf-2012-0017 ◽

2013 ◽

Vol 67 (2) ◽

pp. 137-146 ◽

Cited By ~ 24

Author(s):

Karl-Christian Mahnert ◽

Stergios Adamopoulos ◽

Gerald Koch ◽

Holger Militz

Keyword(s):

Cell Wall ◽

Wood Species ◽

Extractive Content ◽

Chemical Changes ◽

Heat Treated ◽

Before And After ◽

Terminalia Superba ◽

Uv Microspectrophotometry ◽

Modified Wood

Abstract To broaden the knowledge about the chemical changes at the cell wall level of differently modified tropical hardwoods, heat-treated and N-methylol melamine (NMM)-treated samples of koto (Pterygota macrocarpa) and limba (Terminalia superba) were prepared. UV microspectrophotometry (UMSP) was applied at 278 and 240 nm as specific wavelengths to analyze chemical alterations of the samples caused by heat and NMM treatment, respectively. The absorbance of koto exceeded that of limba before and after treatment, potentially due to the higher extractive content of the former. Regardless of the wood species, the absorbance of the samples increased with increasing intensity of the NMM treatment. Additionally, the absorbance of lignin within the spectrum of 230–350 nm was altered due to the NMM treatment. The functionality of applying specific wavelengths for the analysis of different modification methods of wood was proven. However, the comparison with literature did not show differences in the absorbance, which could be assigned to the characteristics of tropical hardwoods.

Download Full-text

Influence of anatomy on the adhesion performance of four wood species

Research Society and Development ◽

10.33448/rsd-v9i4.2727 ◽

2020 ◽

Vol 9 (4) ◽

pp. e31942727

Author(s):

João Gabriel Missia da Silva ◽

Pedro Nicó de Medeiros ◽

Denise Ransolin Soranso ◽

Vinicius Peixoto Tinti ◽

José Tarcísio da Silva Oliveira ◽

...

Keyword(s):

Shear Strength ◽

Specific Gravity ◽

Wood Species ◽

Tectona Grandis ◽

Glue Line ◽

Anatomical Characteristics ◽

Ray Cells ◽

Adhesion Performance ◽

Adhesion Process

The aim of this study was to evaluate the influence of anatomical characteristics on the adhesion performance of Vatairea sp., Paulownia sp., Aspidosperma populifolium and Tectona grandis wood. Specimens for anatomical, physical and mechanical analyzes were produced from tangentially oriented boards. The treatments were joint glued from pieces of the same anatomical orientation (radial and tangential), evaluated for shear strength and glue line failure. The Vatairea sp wood had the highest specific gravity (0.74 g cm-3) and the Paulownia sp (0.34 g cm-3) wood was smaller. Aspidosperma populifolium species showed the highest shear strength in the glue line in the tangential and radial faces. The anatomical variables with higher influence on the wood adhesion process were pith ray cells and especially fibers that exhibit the greatest correlation with the shear strength of the glue line.

Download Full-text

Effect of Preservation and Moisture Content Change on Physical and Mechanical Properties of Different Wood Species

2nd International Conference on Research in Science, Engineering and Technology (ICRSET’2014), March 21-22, 2014 Dubai (UAE) ◽

10.15242/iie.e0314591 ◽

2014 ◽

Keyword(s):

Mechanical Properties ◽

Moisture Content ◽

Wood Species ◽

Physical And Mechanical Properties ◽

Content Change ◽

Moisture Content Change

Download Full-text

Peran Teknologi Dalam Mengembangkan Potensi Ekspor Topeng Malangan (Analisis Situasional Dan Rencana Solusi)

JATI EMAS (Jurnal Aplikasi Teknik dan Pengabdian Masyarakat) ◽

10.36339/je.v2i1.106 ◽

2018 ◽

Vol 2 (1) ◽

pp. 35

Author(s):

Nurida Finahari

Keyword(s):

Production Process ◽

Wood Species ◽

Management System ◽

Raw Materials ◽

Business Management ◽

Production Equipment ◽

Cultural Events ◽

The Arts ◽

Puppet Show ◽

Three Stages

The art of chisel mask is developed in Tumpang Malang area as part of dance costume fairs, puppet show andcultural ritual, although in its development, this mask sculpture is also sold and become a tourism commodity. The potentialsales of mask sculptures is increasing, especially because of the demanders are foreign tourists, cultural enthusiasts andcomponent of tourism activities. That is, Topeng Malangan has the potential to be developed as an export commodity. Thesales system is still limited to cultural events or when there is a visit of education and tourism to the arts-padepokan. Thisprompted some people around the padepokan to start a home industry to meet the availability of the mask. In general, theproblems encountered by the craftsmen are (1) availability of raw materials, especially for suitable wood species, (2)production equipment, especially for pre-carving process and preservation of product, (3) there is no standard marketingscheme, (4) does not have a business management system, and (5) highly skilled craftsmen are still very limited. The solutionsoffered are divided into three stages: (1) technological strengthening, including strengthening production process technologyand increasing the number of craftsmen; (2) establishing business management; and (3) establishing trademarks, copyrightsand product marketing expansions

Download Full-text