Your search resulted in 66 documents. Displaying 25 entries per page.
A Conceptual Review of Young People’s Perceptions about Wood
2018 - IRG/WP 18-40836
This article was adapted from the previous study “Young People’s Perceptions about Wood” prepared by Usta (2017), and extended through the development and evaluation of the initial data in terms of the conceptual framework regarding the descriptions of wood by young people. Because it was highlighted by previous study that the university students as the full members of society have the awareness that wood provides benefits to humanity due to its naturality and versatility, this article continues and completes the previous study by considering a broad variety of different viewpoints of university students on wood.
Management of the wood and additives wastes in the wood processing industries: Problematics and technical answers review
1996 - IRG/WP 96-50073
Management pathways for pure wood subproducts are well known and used; but as soon as additives like preservatives, glues, varnishes or coatings are present within the wood wastes, their disposal or valorization becomes more tricky. The different kinds of mixed wood wastes of the wood processing industries, from the sawmill to the furniture manufacture, are identified herewith and their diversity is examined. These wastes can be classified according to their danger characteristics, taking into account the type of additives, their concentration, their availability for the environment, the physical state of the waste. Different disposal pathways are then considered. Combustion, with the possibility of energetic valorization seems the best answer for a major part of these wastes. But this is only possible if good combustion conditions are defined, so that no harmful products are emitted. Moreover, these conditions must be affordable on the technical and economical point of view. Then, some wastes cannot be burned in such a simple way, and need a larger approach, which is presented in this document.
S Mouras, G Labat, G Deroubaix
Report and recommendations of the National Termite Workshop held in Melbourne on the 17 April 2002.
2003 - IRG/WP 03-10478
There are two parts to this Report. Part One summaries the outcomes of an industry workshop organised to better scope the subterranean termite problem, identify knowledge gaps including R&D gaps and identifying strategies including cost-effective co-ordination mechanisms for addressing the issue. Part Two is a brief review of the current state of knowledge on subterranean termites of economic importance to the wood products industry in Australia.
B M Ahmed, J R J French
A review of the configuration of bordered pits to stimulate the fluid flow
2005 - IRG/WP 05-40315
As the bordered pits have generally been thought to have an influence on the refractory nature of softwoods, structural behaviour of this conducting pathways is discussed according to the published literature. Various theories on the role of bordered pits to axial flow are expounded in respect to preservative treatment. Pit aspiration is also reviewed.
Options for accelerated boron treatment: A practical review of alternatives
1985 - IRG/WP 3329
Boron wood preservatives are almost exclusively applied by momentary immersion and block diffusion storage. Alternative techniques are described which can be used to accelerate boron treatment. Diffusion coefficients have been derived to define the acceleration of diffusion with increasing temperature. Schedules are described for pressure impregnation of green timber, involving steam conditioning, evacuation and alternating pressure method treatment. Timber Preservation Authority penetration and retention requirements can be met in approximately 4-5 h. The optimum schedule, however, included a 12 hour holding period between steaming and preservative treatment. A method of applying boron preservatives as a vapour is described, Trimethyl borate vapour reacts with wood moisture to form boric acid. The kinetics of this reaction, however, are very fast. This limits treatment to timber dried to very low wood moisture contents.
P Vinden, T Fenton, K Nasheri
Boron treatments for the preservation of wood - A review of efficacy data for fungi and termites
1994 - IRG/WP 94-30037
Boron treatments have been used for many decades for protection of timber from biological attack and also as a fire retardant treatment. In recent years there has been an increased interest in boron treatments as an option for protection of structural timbers' e.g. timber framing used in termite risk areas. This paper reviews efficacy data for both fungi and termites relevant to this end-use.
J A Drysdale
Review of the literature on Lyctidae (Coleoptera)
1987 - IRG/WP 1211
Mycological testing of plywood and board materials. Part 1: Review of information supplied by IRG members
1978 - IRG/WP 284
In December 1975 IRG members were asked for published information, information of current work in progress and views on mycological test methods for board materials. The object was to stimulate discussion and possibly establish a joint research effort within IRG in order to establish a meaningful test with reproducible results.
C R Coggins
A critical review of the AWPA standard method (M12-72) for laboratory evaluation to determine resistance to subterranean termites
1986 - IRG/WP 1298
The American Wood Preservers' Association standard (M12-72) for evaluation of candidate wood preservatives against subterranean termites is reviewed and suggestions for revision are made. The most serious flaws in the current test procedure involve a failure to recognize inter- and intraspecific variation and a lack of quantification of test results.
J P La Fage, M Jones
Bacteria and wood. A review of the literature relating to the presence, action and interaction of bacteria in wood
1971 - IRG/WP 101
S E Rossell, E G M Abbot, J F Levy
Preservative-treated wood as a component in the recovered wood stream in Europe – A quantitative and qualitative review
2004 - IRG/WP 04-50218
Wood preservatives have been used for the protection of timber products in the European market in appreciable quantities for about 100 years. Between the 1960s up to the present day this usage has been particularly noticeable. The aim of this paper is to present quantitative and qualitative data on the volumes of preservative treated wood placed on the market in the UK and Sweden and to evaluate the expected quantities of preservative treated wood coming out of service and into the ‘recovered’ wood stream in the future. Data are presented from a case-study in the UK on CCA (copper, chromium, arsenic) treated timber and projections on likely amounts of this entering the recovery stream up to 2061. It is estimated that in the UK in 2001 approximately 62,000m3 of CCA-treated wood required disposal and that this could rise to about 870,000m3 by 2061. The proportion of CCA-treated timber in all post consumer waste wood in the UK is predicted to rise from about 0.9% in 2001, to about 12.3% in 2061 representing a substantial component of the post-consumer wood stream. In Sweden statistics have been compiled for production of preservative treated wood for many years. The preservatives used for waterborne treatments have also changed significantly over the last 10 years from a dominant role for CCA to alternative, As-free systems. It is estimated that preservative treated wood will represent on average about 5% of the recovered wood flow in Sweden over the next 25-30 years and that this will represent an appearance of about 8000 tonnes of As, 7000 tonnes of Cu and 6500 tonnes of Cr. These data and the possible disposal options for CCA and similar treated wood are considered in a life-cycle thinking context.
R J Murphy, P Mc Quillan, J Jermer, R-D Peek
Fumigation as a remedial treatment: A review of North American literature
1983 - IRG/WP 3253
The development of the use of fumigants for eliminating decay in timber and roundwood in North America is reviewed. Initial experiments on oak wilt identified volatile chemicals which eradicated decay in roundwood. Subsequently, extensive experimentation on Douglas-fir poles in service showed that treatment with chloropicrin eliminated internal decay for more than ten years. Vorlex was also quite effective, but Vapam appeared to be much less effective, with decay fungi becoming re-established within ten years of treatment. Studies on other wood species indicated that fumigation could be successfully used to treat resistant species such as western red cedar. Fumigation of glulaminated beams and large timbers with chloropicrin, showed that internal decay could also be eliminated in these products, although wrapping the beam in polyethylene was beneficial for optimization of the treatment. Bioassay techniques have been reported for successful monitoring of fumigant vapor concentrations in treated poles.
J N R Ruddick
Termites in Eastern Canada: An updated review and bibliography
1990 - IRG/WP 1431
This report updates Document No. IRG/WP/1333, issued in 1987. The current distribution of termites in eastern Canada and current termite control practices and controversies are explained, and current research is very briefly summarized. Since 1987, Reticulitermes flavipes (Kollar) (Isoptera: Rhinotermitidae) has been discovered in several more municipalities in the province of Ontario, and in Winnipeg, Manitoba. In October 1989, a well-established drywood termite (Isoptera: Kalotermitidae) infestation was also found in the framing of one house in Toronto. Restrictions on soil pesticide applications for subterranean termite control have increased since 1987, and research on termite biology and control has progressed at the University of Toronto. A comprehensive bibliography of publications, technical reports, and theses concerned with termites in eastern Canada is included in this report.
J K Grace
The use of TCMTB in applications other than sapstain prevention: A review
1990 - IRG/WP 3606
The efficacy of TCMTB against staining fungi and surface moulds has been thoroughly investigated during the last decade. As a result, the chemical is used as an alternative to the chlorinated phenols in various parts of the world for the preservation of freshly sawn timber. Less known are the data obtained against brown rot, white rot and soft rot fungi. The termite repellent and bactericidal properties of the chemical widen the scope of application possibilities. The objective of this article is to report on the data actually available.
R Van der Eynde
A review of environmental emissions from building and construction materials in comparison with preserved wood
2005 - IRG/WP 05-50224-11
A review of the public domain literature concerning emissions to the environment from materials which are used in the construction of buildings (e.g. Concrete, Asphalt, Galvanised Steel), in comparison with preserved wood, and a review of the approaches taken by the construction sector in assessing the risk from environmental emissions, in comparison with the approaches taken by the wood preservation sector.
E F Baines
Biocide Treatments for Wood Composites - A Review
2006 - IRG/WP 06-40323
This paper reviews the biocidal treatment of wood composites. Included are in-process and post-process treatments. Various biocides are covered as are methods of application. Novel treatments and technologies are also presented.
J W Kirkpatrick, H M Barnes
Review of remediation methods of sites contaminated by wood preservatives - testing of filter material for use in permeable barrier technology
1999 - IRG/WP 99-50141
Several treatment methods are currently available for treatment of contaminated sites. Soil and water can be treated by immobilisation, separation or destruction of contaminants. It has been common to use intensive treatment methods starting with soil excavation to reach strict purification goals. However, technical and financial reasons make it difficult to reach the desired treatment criteria. As a result, alternative treatment methods are now being allowed. Less intensive in situ methods are being developed, such as natural attenuation, phytoremediation and permeable barriers. A permeable barrier is a passive treatment method for contaminated groundwater. A study was conducted to test various barrier materials for filtering creosote contaminated groundwater. Peat, compost, bark, sewage sludge and sewage sludge pellets were tested out for sorption of phenol, 2-methylphenol and 2,4-dimethylphenol. Peat and compost showed best sorption efficiency. Peat and compost were mixed with sand in various fractions to see if sand can be used to improve hydraulic properties of the filter material.
G Rasmussen, H Iversen, S Andersen
Termites in Eastern Canada: A brief review and assessment
1987 - IRG/WP 1333
The distribution of termites in Canada is reviewed, with particular emphasis on the eastern subterranean termite Reticulitermes flavipes (Kollar) in Ontario province. Municipal and provincial termite control programs are discussed and current treatment practices are described. Previous research on Reticulitermes flavipes in Ontario is briefly reviewed, with reference to a number of unpublished reports and publications of limited distribution.
J K Grace
Review of Mold Issues in North America and Mold Research at Forintek
2003 - IRG/WP 03-10458
Over the last decade, air quality in homes and workplaces has become a high profile issue especially in relation to mold, receiving considerable media, public and legal attention. Forintek Canada Corp. and the wood industry in general have experienced large increases in inquiries regarding mold and the suitability of wood as substrate for its growth. Because wet wood supports growth of fungi the public perceive wood used in building envelope as a major source of mold and this can affect wood’s image in markets and could be exploited by competitor industries. Forintek reviewed the existing and relevant information about mold, substrates that support its growth and the health issues associated with mold and water damaged buildings. Several projects and collaborative efforts with other groups have been initiated to deal with recognized knowledge gaps. This paper covers the history of mold hysteria, recent statements by authorities on mold and health and summarizes some of Forintek’s recent work. This includes: survey of mold and staining fungi on KD lumber; database of literature on mold, building materials and health; limiting conditions for mold growth, hidden mold and its movement into living spaces and a lab test method for mold resistance of wood products.
A Uzunovic, A Byrne, Dian-Qing Yang, P I Morris
Forest management policies and timber supplies in British Columbia
1997 - IRG/WP 97-10244
British Columbia has a huge wealth of timber resources, currently exceeding 7 billion m3 of mature timber on about 43 million ha classified as productive forest lands. That land area also supports a current volume of over 2 billion m3 of timber in immature stands. How much of the volume will be made available as an annual timber supply for the forest industry is dependent upon a set of policies governing timber harvest regulation, including social decisions on land and resource allocations, such as parks, and required resource management practices, such as environmental protection measures. These policies are considered by the province's Chief Forester along with detailed inventory data when determining an Allowable Annual Cut for each sustained-yield management unit. This paper provides an overview of timber harvest regulation in British Columbia and examines some of the major policy initiatives affecting timber supplies. Results of the recent Timber Supply Review are presented, along with a forecast of timber supply trends over the next several decades. Opportunities for increasing future supplies are identified.
R B Addison
Biodegradation of wood in wet environments: A review
1997 - IRG/WP 97-10217
Wood in wet environments is attacked and degraded by soft rot fungi and erosion and tunnelling bacteria, which are more tolerant to high moisture and reduced oxygen conditions than basidiomycetes, such as white and brown rot fungi. Since basidiomycetes are normally more aggressive and can degrade wood faster than soft rot fungi and bacteria wood in wet environments can survive longer. In fact, archaeological investigations have shown that wood buried deep in ocean sediments have survived relatively intact for hundreds and even thousands of years. In this review degradation patterns of various types of microbial wood decay have been briefly described, and then examples of decay type(s) present in wood exposed in various wet environments are presented. Concluding remarks emphasise the importance of understanding the relationship between the conditions of wet environments and the biological wood decay present for prolonging the life of wood in service and properly restoring wooden artefacts of historical value.
A P Singh, Yoon Soo Kim
A Review of the Factors Affecting Permeability in Softwoods
2004 - IRG/WP 04-40278
This paper reviews the literature discussing some of the qualities and properties of softwood that characterise its refractory nature and influence its treatability. This review covers mainly the period of 1954 to 1997. Literature prior to this period is included where it is thought that existing reviews have not adequately reported the subject matter or alternatively to provide background information for the topic. Earlier literature has been well covered by such reviews as Anderson et al. (1941), Tiemann (1944), Jane (1956), Hunt and Garratt (1967), Kollmann and Cote (1968), Comstock (1970), Siau (1971), Nicholas (1972), Skaar (1972), Arsenault (1973), Nicholas and Siau (1973), Stamm (1973), Wilcox (1973), Findlay (1975), Wilkinson (1979), Panshin and de Zeeuw (1980), Zobel and van Bujitenen (1980), Dinwoodie (1981), Siau (1984), Wilson and White (1986), Tsoumis (1991), Eaton and Hale (1993), and Langrish and Walker (1993). Aspects emphasised in this review are both direct and indirect factors which control permeability in softwoods, and how the softwood structure affects residual flow in respect to preservative treatment
Pentachlorophenol, its salts and esters; UK review of its uses in wood preservation and surface biocides
1995 - IRG/WP 95-50040-27
The review on pentachlorophenol was undertaken by the Health and Safety Executive on behalf of the independent Advisory Committee on Pesticides in response to the 9th Amendment to the Marketing and Use Directive. The high toxicity to man and the environment was noted and the associated risks were assessed. The Cornmittee concluded that the potential carcinogenicity was probably via a non-genotoxic mechanism but required further information. It also recommended that the continued approval of the remaining products used in wood preservation did not pose an unacceptable risk to man or the environment because of the contained exposure. Thus further restrictions, beyond those required by the 9th Amendment, were considered unnecessary. However, there was evidence that intermittent high levels of PCP were detected around large chemical, petrochemical and steel manufacturers and industrial areas and these might warrant further investigation.
M Fitzpatrick, C Mackie
A review of incising as a means of improving treatment of sawnwood
1994 - IRG/WP 94-40019
The use of incising, perforation of the wood surface, is increased because of the need to treat refractory wood species. This paper reviews the development of incising and shows how the required incising patterns can be determined and specified. Most of the development has been in the area of toothed-roller incisors because of their rapid throughput. Needle, Laser, drill and water jet incisors have also been used experimentally but such incisors are not available commercially to our knowlege. The advent of close-spaced roller incising patterns and thin, sharp teeth has brought the effective treatment of most refractory species within our grasp. Modern toothed-roller incisors can provide an integral shell of preservative treatment while leaving an acceptable surface appearance and strength. Incising appears to improve the drying rate of green lumber and reduce the incidence of large checks. Three long-term field tests provide confidence in the long-term performance of CCA-treated incised lumber made from refractory species with non-durable heartwood.
P I Morris, J J Morrell, J N R Ruddick
Soil termiticides: A review of efficacy data from field tests
1987 - IRG/WP 1323
This paper reports efficacy data from the field evaluation of various soil termiticides by the U.S. Department of Agriculture, Forest Service, Gulfport, Mississippi. These chemicals, which include a number of chlorinated hydrocarbon, organophosphate, pyrethroid, and carbamate insecticides in a range of concentrations, have been in long-term tests at seven field sites. Data are reported for the ground-board method and/or the concrete slab method of evaluating the effectiveness of these chemicals as termiticides.
J K Mauldin, S C Jones, R H Beal