Treesearch

Physical and mechanical properties were determined for saligna eucalyptus (Eucalyptus saligna, Smith) grown in Hawaii. In comparison with wood of the same species grown in Australia, saligna eucalyptus grown in Hawaii was lower in density, shrinkage, and compressive strength parallel to grain; it was about equal in strength in bending and shear; and it was stiffer. Compared to commercially important Mainland species, saligna eucalyptus grown in Hawaii is considered exceptionally stiff and the green wood is stronger than average for its density: however, strength of air- dry wood and...

The Forest Products Laboratory has developed a laminated diving board that has shown excellent performance characteristics. This board has given long, economical service under the severe moisture hazards and heavy service conditions such as found at public swimming places. The adhesive used is of the fully waterproof synthetic-resin type, which requires no protection from moisture. The board is made from narrow strips of seasoned lumber and is fully equivalent to the premium-quality one-piece boards made from selected wide and thick stock.

A laboratory procedure is outlined that incorporates techniques found to promote soft rot by several fungi. This procedure employs either an agar or a soil substrate. Also presented are the principal findings of experiments underlying the procedure. Results of tests conducted according to the suggested procedure are illustrated. The overall decay resistance of the softwoods typically was greater than that of hardwoods. The levels of decay in softwoods, however, were substantially higher than previously obtained. There was a tendency for decay in soil to he somewhat greater than on agar;...

“Pacific madrone (Arbutus menziesii Pursh) is a moderate-sized hardwood tree found in the Pacific coastal country from British Columbia to southern California. In California it also grows in the western Sierra Mountains below 4,000 feet elevation. The tree is also known as madrono and madrona. It is locally used for fuelwood, fence posts, charcoal, and to a minor extent for lumber and veneer. The latter uses are limited because of the tendency of the tree to grow with poor form except in dense stands. The tree attains a diameter of 2 to 4 feet (2) 2 and a height of about 80 feet on good...

This report gives information on the preparation of wood fuel from wood residues and other wood raw materials. Types of wood fuel discussed are cordwood, stovewood, slabwood, kindling, chips, hogged fuel, sawdust and shavings, bark, charcoal, alcohol, and briquets. Related information is given on types of machinery for preparing wood fuel and on possible markets for its sale.

The purpose of this meeting was to bring together about 30 representatives of the various forest products industries and a few affiliated research and educational institutions to discuss and define industry needs for nondestructive testing. The necessity for such a meeting was made clear in the Symposium on Nondestructive Testing of Wood held at this Laboratory in October 1963.1 The meeting was a direct result of the recommendation made at the close of that Symposium, pointing out that effective development of nondestructive testing within the forest products industries is dependent on...

With all the favorable properties that contribute to its wide use in farming, wood nevertheless needs to be used intelligently, and protected from certain natural enemies. For example, while some species of wood are naturally resistant to attack by decay fungi and harmful insects, most species lack adequate resistance when exposed to attack, This is not serious when wood can be kept dry and away from contact with the ground. However, for such farm uses as fencing, poles, bridges, culverts, irrigation structures, silos, storage sheds, barns, and some types of vehicles, wood must be used in...

The wood-base fiber panel materials are a part of the rapidly evolving technology based on converting lignocellulose to fiber and reconstituting the fiber into large sheets and panels. While some equipment and techniques used are the same as for producing paper, there are enough differences in techniques used and other requirements for manufacture that a separate treatment of the subject is warranted. This research note describes the various requirements for raw materials and equipment, describes various steps in manufacture, and presents summaries of important strength and physical...

The objective of this work was to develop a method, the testing equipment, and the instrumentation with which dynamic stress-strain information may be obtained for paperboards and built-up corrugated fiberboards as used in corrugated fiberboard containers. Much information is available on the properties of these materials when subjected to static or low rates of loading, and this information has been valuable in the design of corrugated containers to resist the compressive stacking loads experienced in shipping and storage.

Acrylonitrile (CH 2 = CH -CN) was reacted with unbleached southern pine kraft linerboard and bleached southern pine kraft cardstock to determine the effect of this treatment on compressive strength and dimensional stability. A sweetgum kraft pulp was treated similarly before and after bleaching and the paper-making qualities ,of the treated pulps were evaluated. The product qualities of these original materials changed considerably. The cardstock increased in weight by 30 percent after treatment with a 6 percent aqueous so1ution of acrylonitrile. However, the unbleached linerboard treated...