Surface properties of impregnated and varnished Scots pine wood . Dec 19, 2013 . Abstract. In this study, the effect of accelerated weathering on the surface properties of Scots pine specimens impregnated with wolmanit-CB, tanalith-E, and adolit-KD5 and coated with synthetic and polyurethane varnishes was investigated by measuring surface hardness, glossiness, and colour. Results..
wood research surface characteristics of wood treated with new . WOOD RESEARCH. 59 (4): 2014. 605-616. SURFACE CHARACTERISTICS OF WOOD TREATED. WITH NEW GENERATION PRESERVATIVES AFTER. ARTIFICIAL WEATHERING. Ozlem Ozgenc. Karadeniz Technical University, Faculty of Technology Department of Woodworking Industry Engineering. Trabzon, Turkey
Effects of copper-plasma deposition on weathering properties of . Mar 15, 2016 . The plasma system and the chosen parameters guarantee moderate temperatures that allow copper coating on thermosensitive materials like wood. The aim of this study is to evaluate its effect on weathering properties measuring loss of lignin and tensile strength, as well as changes in copper content and..
Timber weathering | NBS Oct 7, 2011 . Timber has long been a staple construction material for domestic scale properties, although it is increasingly being used in high-profile structures such as the Weald & Downland Gridshell. However, exposure to the elements can result in changes to the chemical and physical properties of wood, affecting its..
Outdoor Wood Weathering and Protection weathering of unpainted wood affects the durability of exterior coatings. These authors demonstrated that the surfaces of spruce and pine wood de- graded rapidly when exposed to the weather. After 1 month of outside exposure, the paint-holding properties of the wood were adversely affected. The wood continued to..
Properties after weathering and decay resistance of a thermally . According to Williams (2005) free water is not required for weathering to occur, but the presence of the free water can accelerate the process through splitting and checking of the wood. In this context, fluctuating climatic conditions affect the internal structure of reconstituted structural products, once they are prone to swelling..
The effect of natural weathering on untreated wood surface - SciELO In accordance with these trends, wood elements are often left untreated. The presented study is aimed to characterize and compare a surface degradation of untreated wood caused by weathering. Weathering characteristics of softwoods and hardwoods (spruce, pine, Douglas fir, larch, oak, black locust, maple, poplar and..
Wood Durability | The Wood Database In addition to the length of time the wood can physically maintain its structural integrity, there's also the matter of a wood's weathering characteristics. Weathering can't be as clearly expressed in a single number or measurement, but overall, woods with good weathering characteristics exhibit limited photo-degradation..
weathering properties of wood species treated with . - BioResources (2012). ood coatings & weathering, BioResources 7(4), 4875-4888. 4875. WEATHERING PROPERTIES OF WOOD SPECIES TREATED. WITH DIFFERENT COATING APPLICATIONS. Ozlem Ozgenc, a,. * Salim Hiziroglu, b and Umit C. Yildiz c. The objective of this study was to evaluate the discoloration of European
weathering and protection of wood - Forest Products Laboratory commonly believed. Fungal infection was the result of a temporary or lasting wetting of the wood surface with water. Sell and Leukens (34) subjected 20. European and non-European softwood and hard- wood species of widely differing density and mechanical strength properties to unprotected out- door weathering of 45 ..
The Effects of Preservatives on the Properties of Wood after . Wood is a material that is widely used in many applications but it has some weak properties which can be modified with various solutions. The aim of this study is to examine how preservatives affect wood properties. The effects of preservatives are classified into five categories: mechanical properties, weathering, moisture..
Weathering Characteristics of Wood Plastic Composites Reinforced . Jul 23, 2016 . The wood flour was pre-extracted with three different solvents, toluene/ethanol (TE), acetone/water (AW), and hot water (HW), or sodium chlorite/acetic acid. The spectral properties of the composites before and after artificial weathering under accelerated conditions were characterized by Fourier transform..
wood research weathering properties of scots pine treated with . Various experts have made some definitions of weathering (Williams and Feist 1999, Evans 2009). The main factor that causes the greatest changes in the surface properties of wood during outdoor exposure is sunlight (Tolvaj et al. 2011). Because lignin is one of the main chemical components of wood, this aromatic..
Surface properties of tannin treated wood during natural and . Nov 18, 2013 . Novel tannin based formulations were tested to evaluate their efficacy in preventing weathering degradation of the surfaces. Scots pine and European beech specimens were treated with flavonoid based wood preservatives and exposed to artificial and natural weathering. The surface properties of the..
Weathering of Wood Chapter 7 - CiteSeerX degradation on the physical properties, and methods for retarding or inhibiting degradation t is possible to maximize the service life of all types of wood products in any type of climate. The purpose of this chapter is to describe the chemical and physical changes that occur to wood during weathering and explore methods..
Effect of heat treatment on the weathering and hardness properties . Thermal modification is known as a potential method to improve dimensional stabilization of wood and enhance its biological resistance. Scots pine (Pinus sylvestris), spruce (Picea orientalis), ash (Fraxinus spp.), tali (Erythrophleum ivorense), and iroko (Chlorophora excelsa) timbers were exposed to heat treatment at at a..
Exterior Wood Coatings More detail on effects of different treatments on changing the surface properties of wood is discussed later in the chapter. In addition to deterioration caused by decay fungi and insects, wood-exposed outdoors go through some physical and chemical changes known as weathering. Weathering degradation mainly affects the..
Weathering characteristics of hardwood surfaces | SpringerLink Aug 15, 1984 . Four hardwoods, red oak, white oak, yellow-poplar, and sweetgum, were exposed to outdoor weathering and to artificial ultraviolet (UV) light with wavelengths of 位>220 and >254 nm. Discoloration and loss of brightness were observed from all specimens regardless of their exposure conditions. White oak..
Color Changes In Wood While Weathering - FH Salzburg This study deals with the changes in wood color during natural weathering. The color has an influence on the aesthetic properties of wood surfaces, and the discolorations influence each individual's perception of constructions. The surface color for Douglas fir and Norway spruce sam- ples was determined according to the..