The B.C. Wood Specialties Group (BCWSG) laminating mission to Japan took place May 14-22, 1994 and involved visits to Japanese companies and industry associations in Nagoya, Osaka, and Nara. The mission was led by Mr. Peter Fisher, Director, Resource Industries Branch, B.C. Ministry of Employment and Investment. The purpose of the mission was to make contacts and to gather information so that the B.C. wood remanufacturing industry could capture further market opportunities during the trip and identify possible future markets for B.C. wood products.
A study by the British Columbia Ministry of Forests (BCMOF), Fraser Lake Sawmills (of West Fraser Mills Ltd.), and the Forest Engineering Research Institute of Canada (FERIC) compared at-the-stump and roadside processing of stems. FERIC determined the productivity and costs of the two harvesting systems and five subsequent regeneration regimes. The impacts of these treatments on slash distribution, cone distribution, mineral soil exposure, site distrubance, and plantable spots were also examined.
Ce rapport decrit l'etat d'avancement des travaux sur le developpement d'un modele de simulation et d'optimisation du procede de transformation des bois en sciage. L'approche adoptee pour la construction de ce modele y est decrit en detail. Des annexes sous forme d'articles scientifiques, d'actes de conferences et de rapports de travaux d'etudiants gradues sont aussi incorpores au present rapport afin de faciliter la comprehension du lecteur.
The objective for this work was to prepare a project plan for the development of moisture management guidelines to maximize durability of wood-based building systems. Exploration of the complexity of the technical issues involved led the conclusion that access to the use of a reasonably accurate computer model was needed to explore the performance of systems we feel have shown good track performance. Essentially, parametric sensitivity studies are needed, both to confirm the suitability of walls built in the different regions of the country based on the current field experience, and to extrapolate limits to these systems that might also be used as a guide for unconventional systems. With this assurance, information of the performance of typical wall systems as a function of the variables noted in this report should be obtained by modelling. It should then be possible to develop or assist in the developing of simpler user-friendly design tools for the building industry which incorporate advice on good construction practices.
To isolate extracellular enzymes form candidate fungi screened for biological protection of unseasoned lumber and from fungi associated with sapstain. To determine the role of extracellular enzymes in bioprotection. To identify secondary metabolites produced by fungi associated with sapstain of lumber from literature references.
The use of microorganisms for the protection of lumber from mould, stain and decay is an alternative to the use of biocides that could allow the sawmill industry to decrease the use of chemicals. Successful implementation of bioprotection requires a basic understanding of the effects of biotic and abiotic factors on the physiology, biology and ecology of sapstain fungi and bioprotectants in situ. Knowledge of the ranges of abiotic factors under which a bioprotectant will survive, germinate, grow and be competitive is essential to achieve consistent and efficacious protection. Identification of such factors would enable its inclusion in the deployment milieu. In addition, development of methods to monitor the bioprotectant on lumber would also aid in the study of population dynamics and is essential for quality control and assurance.
The highlights of a co-operative research program developed by the U.S. Forest Products Laboratory (FPL) and Forintek Canada Corp. to provide detailed creep-rupture and some creep information for composite panel products are summarized here. Support for this program has been provided by the American Plywood Association, The Waferboard Association (now the Structural Board Association), as well as the U.S. and Canadian Forest Services. Commercially produced plywood, oriented strandboard (OSB), and waferboard were tested to identify three mills that produced panels with high, low and median flexural creep performance. These three plywood, three OSB, and three waferboard products were then extensively tested to provide information on their duration of load and creep performance.
A series of plywood and laminated veneer lumber (LVL) panels were prepared using veneers with higher than normal moisture contents in face and back layers. The purpose of the work was to evaluate the effects of self-generated steam on the pressing times and panel warpage. Panels made with 6% and 10% m.c. faces and backs were compared with control panels made with all dry veneer. Thirteen- ply 40 mm (1 5/8 inch) thick panels were evaluated for press times and thin 9.5 mm (3/8 inch) panels were evaluated for cupping and bowing. Normal plywood press temperatures and adhesives were used. All panels were made with incised 3.2 mm (1/8 inch) SPF veneers. The project demonstrated that substantially shorter press times and more dimensionally stable panels can potentially be made using higher moisture content outside veneers.
There are currently inconsistencies in the implementation of design for compression perpendicular-to-grain (C-perp) in the Canadian engineering design in wood code. Not only does this make the design code confusing, but this inconsistency is also a hindrance to the introduction of higher C-perp strength values for MSR lumber. For some engineered wood applications, higher design stresses may result in unsafe conditions. Without revisions to the design procedures, it would not be possible to allow the use of higher C-perp design strengths for applications where it is warranted. The study focused on resolving the inconsistencies in implementation of C-perp design for solid sawn lumber and glued laminated timbers. A testing program consisting of short term and constant load tests were conducted. Finite element analysis of typical C-perp stress conditions were also performed. This work was under the guidance of a CSA-O86 task group on C-perp design. The findings were submitted to the task group and proposed code changes were developed. Presentations on the proposed changes were then presented at the November 1993 meeting of the CSA Technical Committee on Engineering Design in Wood. If the codes changes are approved, design for C-perp will be more rational and refined, especially for engineered wood construction. The code change proposal also includes higher C-perp design values for C-perp for machine stress rated S-P-F lumber.