OBJECTIVES The aim of this study was to evaluate dermal exposure to the resin acids abietic acid, dehydroabietic acid and 7-oxodehydroabietic acid during collecting in sawmills and during sawing in carpentry workshops, respectively. METHODS Sampling was performed by fastening patches at 12 different areas on a sampling overall, one patch on the front of a cap, one patch on the chest inside th...

Abstract The processing of wood as a renewable and sustainable material is steadily gaining in importance. However, sawing processes sawmills are characterized by high electrical energy consumption. Improving the geometry saw teeth an option to make more efficient sustainable. Since industrial rather inflexible, development new tooth geometries takes place smaller experimental setups. inhomogen...

The effects of the Engineered Micro-Geometry (EMG) carbide teeth circular saws on their wear rate and resulting sawing variation for 2-time intervals were studied. objective was to improve resistance used during primary transformation wood. tests carried out under industrial production conditions with two series saws; 1- up-sharp tips, 2- cutting edges honed adopt a waterfall geometry. duration...

In the forest products manufacturing industry, recent price increases in the cost of high-quality lumber together with the reduced availability of this resource have forced manufacturers to utilize lower grade hardwood lumber in their manufacturing operations. This use of low quality lumber means that the labor involved in converting this lumber to usable parts is also increased because it take...

In soft-wood sawmills in the western U.S., the green lumber end-product is the result of several distinct sawing operations: an initial breakdown of large diameter logs by a headrig yields boards that are subsequently resawn one or more times by secondary saws of various types. Vibration of the saws contributes to irregularities in thickness of the final green lumber. Misalignment of the saws p...

For spruce (Picea abies (L.) Karst.), as with most other species, the value of a log is to great extent determined by its defects. That is the reason why sawyers, aiming at the optimal utilization of a log, were naturally interested in defects, their number, position and shape. X-ray computer tomography (CT) scanning is able to detect internal density variations related to defects. In order to ...

Growth stresses are usually present in the fast-growing trees of forest plantations and can be evaluated along stem diameter. relaxed after tree felling during sawing drying, manifested lumber quality. Different methods have been employed to reduce effect growth stresses, such as steaming heating treatments. Excellent yield Hyeronima alchorneoides were observed, but they showed difficulties pri...