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Directional structure particle board (OSB) may become a trend
Directional structure of particle board (osb) is North America and Europe in seven, developed a new type of plate in the eighty s.Production and sales of osb has ten years history, but the development speed is slow, market development.
Directional particieboard structure may become a trend
1 definition
Structure of directional particieboard (English oriented strand board, osb) is a kind of material to path, thinning wood, wood core, slab, brushwood, and so on as raw materials, through special equipment along the grain growth direction processing 40 mm to 120 mm, 5 mm to 20 mm wide, thick 0.3 mm to 0.7 mm of flaking, after drying, glue and special equipment will form core layer flaking crisscrossed directional shop is installed, then hot press molding of a kind of man-made board.
Because of osb adopted a special process and special equipment, basic retain the natural properties of wood, so it has high bending strength, small linear expansion coefficient, good dimensional stability, uniform texture, holding nail force is strong, easy to surface decoration, etc.Due to its flaking is arranged in a certain direction, it is the main characteristic of longitudinal bending strength is much bigger than transverse bending strength.
2 production process
Osb production of the main process is: the log to peeling, flaking to drying, screening to sizing, the shop - hot - plate processing.
Osb all tree species can be used for production, small diameter log can be up to 50 mm.The icy outside under the condition of low temperature and water content of log log need to soak in water.Peeling has two kinds of rotary peeling and drum peel, peel the bark can be used as the fuel of the factory.Plane leather for the use of disk or ring type machine.Generally, dry hot flue gas drying, because it than in hot oil or steam as medium heat energy utilization is much higher.Dry heating shavings moisture content fell to 2% from 80% ~ 120% ~ 4%.Screening of fine material to power plant, fines accounted for about 5% ~ 15%.Dry wood wool after sizing machine into the store and shop, and the particle packing density of 70 ~ 90 kg/m3.
The whole production process of hot pressing process is crucial, compared with the multilayer press, using a continuous press have higher technical content, more evident advantages:
(1) make continuous production control possible
(2) the heating time is low, productivity is higher
(3) the finished board thickness tolerance is more small, can need not sanding
(4) of the specifications of the product have more choices, change product specifications qi edge losses small
(5) the plank after pressure has low moisture content
6 required for processing of small amount of exhaust gas
3 the benefits of the development of osb
Compared with other woodiness material, osb has the following advantages:
(1) wide raw material sources, low cost, using the soft and hard wood timber, quick thinning forests or growth year shorter trees;
(2) exempted from inspection, osb in the manufacturing process after high temperature drying and high temperature hot pressing, so the parasites off the tree, fungi, rot fungus and so on all have been killed, is the world recognized exempted from inspection the packing materials;
(3) excellent performance, the structure of the overlapping osb has extremely high dimensional stability and strength, also has the thermal insulation, heat insulation, flame retardant, impact resistance, water resistance, surface waterproof performance is good, long life and other characteristics;
(4) material has certain moisture content, with functions of breathing, is especially suitable for packaging appliances and food;
(5) easy processing, osb restructuring the structure of wood texture, and eliminate the influence of internal stress of lumber for processing, make it has good workability, sawing, drilling, planing, milling, nail, screw and attached on the surface can be oil, wax, paint and coatings;
(6)reproducibility, reusable, recyclable, fully meet the environmental requirements;
All landowners to ecological balance, use man-made board to replace the original solid wood materials, can reduce or avoid to cut down trees, is conducive to ecological balance;In turn can prevent sand production, reduce the pollution of the atmosphere.
4 use
Osb has various advantages of natural lumber, and eliminates the anisotropy of natural lumber and the shortcomings of low transverse strength, easy to crack, in addition, the surface is bright and clean, easy to machining, specifications, so it can be widely used in construction and other industries.Application field of osb has a train car, roof panel, wall components, the floor and ground pad material, cement template, agricultural structures, mobile/light, decorative panels, furniture, billboards, etc., simple processing safely and quickly.
Osb for packaging industry, has a strong product protection function, can keep stable shape in harsh environment.Osb can make container, warehouse, cable trays, boxes and pallets, etc., it has the earthquake, moistureproof, moth-proofing, high material utilization, etc, especially for export packing, osb export inspection exemption advantage is very obvious.According to German packaging association compression standard en22872 tests, osb packing can withstand the pressure than rubber plate after packing slightly tall, has higher hardness, especially more obvious under wet conditions.
