OSB production process and application field expansion
OSB production process and application field expansion
Oriented Strand Board (OSB) is a kind of structural board made of long, narrow, thin and flat flakes as the basic unit. After gluing, the core layer of particle is oriented to lay and hot-pressed into a structural board by special equipment.
Oriented Strand Board (OSB) was successfully developed by European scientists in the 1970s, and the first OSB production line was built in 1979 in the United States. At that time, the scope of application is still relatively narrow, and then after nearly 10 years of in-depth practice and market development, the application field has been Continuously expand. To the 1990s, OSB in Europe has been rapid development, and quickly replaced plywood and blockboard as one of the fastest growing boards in Europe.
The design concept of oriented strand board is to combine the advantages of plywood and ordinary strand board into one, not only integrating the characteristics of plywood's longer, layered and uniform wood units, but also drawing on the characteristics of ordinary strand board's processing process of simple and easy to operate, and can be produced on a large scale, and ultimately produce high-strength, shear-resistant, static curvature strength, and large-scale industrialized production of panels with excellent performance.
8.5-foot fully automatic continuous flat pressing line
Oriented Strand Board Production Process
Oriented Strand Board (OSB) production process: log peeling - flaking - drying - screening - gluing - spreading - hot press molding - post-treatment - warehousing.
All kinds of wood can be used to produce OSB, but the OSB produced by different tree species will have differences in various properties. From the physical properties, in the case of the same compression ratio, the physical properties of OSB made from wood with small density are better than those produced from wood with large density; from the material of tree species, the particle form made from wood with fine fiber is better than that made from wood with coarse fiber, especially those made from harder material and with coarse fiber, such as Quercus serrata, Ashwagandha, Robinia pseudoacacia, etc. in the northeast; in the chipping process and particle conveying process, most of the particle will be broken into needle shape, so the particle will not only increase the number of needles, but will also increase the number of needles. In the process of chipping and particle transportation, most of the shavings will be broken into needles, such shavings will not only increase the amount of sizing, but also have an impact on the performance of the board. Therefore, it is generally recommended to choose tree species with relatively low density, fine wood fiber and strong toughness, with a diameter of 60 mm or more, preferably a single species.
Log peeling: commonly used peeling machine there are two kinds of roller type peeling machine and hobbing type peeling machine. Rolling simple peeling machine volume is larger, the noise is also larger, but this peeling machine has a wide range of applications, can be used for various species of various specifications of wood peeling, and the material requirements are not high. Hobbing type peeling machine volume is small, the noise is relatively low, but this peeling machine on the quality of wood requirements are high, generally only suitable for diameter level, small curvature, less knots of raw materials.
Canadian KADANT Long lumber slicer
Planer:Generally choose the long material planer, the quality of the shavings will have a greater impact on the quality of OSB. Experiments show that the static bending strength of the board will increase with the increase in the length of shavings face (but when increased to a certain length, the increase in the performance of the board is not obvious), will decrease with the increase in the thickness of the shavings, the width of the shavings has little effect on the board. The theoretical length-thickness ratio of shavings is generally between 100~150, and it is about 200 in the actual production process; the length-width ratio is generally between 5~15, and the width is generally 20 mm in the actual production.
If the wood raw material is small, you can also choose two-stage planer, which can process the small wood or even the boards of the processing plant, various specifications of the old wood into qualified shavings.
Drying: generally choose single-channel rolling simple dryer, drying medium is mostly used hot flue gas, after drying the water content requirements in 2% ~ 4%.
Screening: Screening is divided into two kinds of mechanical screening and airflow screening. Mechanical screening equipment has a variety of horizontal swing sieve, vibrating screen, circular swing sieve, round simple sieve and grading sieve (also known as power roller sieve). The commonly used ones are circular swing screen and roller screen. According to the different production capacity to choose a different screening method, the design of the production line with large production capacity is generally used roller screen, the design of the production line with small production capacity can be used circular swing screen and then with the use of airflow sorting machine, screening out the fine particle can be made of ordinary particleboard or fiberboard, dust, bark, etc. conveyed to the energy plant as fuel to be burned off.
Gluing: Preferred roller type glue mixing machine, surface and core layers are glued separately. According to the use of the board and the market demand for different types of modified urea-formaldehyde glue, phenolic glue, isocyanate glue and other different types of glue.
COIL glue mixer
Paving: three-layer structure of the directional paving head, the core layer for the transverse paving, the surface layer for the longitudinal paving, paving effect is generally measured by the directional angle, the smaller the directional angle, indicating that the directional effect is better.
Hot press molding: hot press has multi-layer press, single-layer press, continuous press. Now large-scale production lines are used in continuous presses, selection should choose the appropriate length of the press, to avoid improper selection of yield, quality impact. Hot pressing temperature, time, pressure, hot pressing curve settings will have a greater impact on the plate.
OSB Production Line Design
The design of OSB production line should be combined with local resources, market demand, capital and other factors for comprehensive consideration. There are three choices: imported complete sets of domestic equipment, imported and domestic equipment combined.
General large-scale production line is divided into the following systems: material preparation system (log peeling - the creation of pieces), drying system, screening system, adjusting the sizing system, laying system, press system, the board processing system, energy plant, other auxiliary systems such as material handling, electrical and automation, etc..
Large-scale production line equipment selection is mostly a combination of imported and domestic supporting. General production line main equipment such as chipper, laying machine, hot press, screening machine, automation control system and so on choose foreign; others such as pneumatic conveying system, flue gas treatment, belt, spiral, rolling table, etc. can be selected from the domestic ancillary equipment, many domestic supporting manufacturers have the ability to produce auxiliary equipment; energy plant main components provided by foreign countries, and other can be supported by domestic manufacturers, and product quality and technical support can meet the design requirements. Technical support can meet the design requirements.
Small production line can be divided into three parts: preparation section (peeling - flaking), the main workshop (drying - sizing - paving - hot pressing - post-treatment), thermal energy. Small production line general domestic equipment manufacturers can meet the production needs, the main equipment paving machine, hot press from abroad, other equipment can be domestic supporting.
Oriented Strand Board Application Areas
In addition to the advantages of high bending strength, small linear expansion coefficient, strong nail holding force, good dimensional stability, low glue consumption, etc., OPC also has various excellent properties of natural wood. Not only eliminates the anisotropy of natural wood and wood's dead knots, water lines, ring cracks and other shortcomings, while giving the board easy to process, large format, mechanical properties significantly higher than ordinary structural panels have many advantages. Thus OSB has a wide range of applications, easy to promote, and obvious advantages.
1.Application in the field of wooden structure houses.
(1) Internal and external walls: OSB has excellent physical and chemical properties, and it is a better wall structure material in wood-frame house construction. OSB planes are arranged in a regular way, and the wood texture is clear and bright, so OSB is a better wall decorative material that can be directly exposed for use in the internal and external walls of wood-frame houses.
(2) Roof bearing boards: OSB has good moisture resistance, corrosion resistance, large width and good thermal insulation properties, so OSB is the ideal roofing material.
(3) flooring materials: OSB is a good material for the floor moisture layer, can also be processed into a variety of good quality, beautiful and durable OSB flooring.
(4) Wooden structure of the house of the I-beam web, wooden keel, etc.
(5) Carved decorative materials: decorative beams, columns, pavilions, railings, eaves, etc.
(6) Quick-assembled houses: simple houses and small houses for field operation, easy to assemble and disassemble, and can be recycled many times to build quick-assembled houses.
JGZmark Thermal Center, USA
2. Civil engineering construction houses.
(1) building materials: OSB can be used as structural panels for roof panels, thermal insulation wall panels, floor laying, flooring.
(2) Interior decoration: door sets, window sets, heating covers ceiling, beds, cabinets, kitchen and bathroom furniture, TV backdrops hotel partitions, etc.
(3) Furniture Manufacturing:Furniture, sofa, bed, desk, bracket, etc.
4. Packaging industry: OSB used in harsh environments, with stable performance, moisture-proof, moth-proof, shock-resistant, etc., by the World Packaging Association as a fumigation-free treatment of the first-class exposure of packaging materials, can be made of packaging boxes and boards, trays, crates and so on.
5. Transportation industry: used for vehicle box board, liner board, carriage floor, etc.
6. Others: display cabinets, library shelves, racks, etc.
Development of OSB application fields
In recent years, with the continuous improvement of OSB production process, market promotion efforts continue to strengthen, OSB is more and more accepted by the majority of consumers to participate in the OSB application of the researchers also continue to emerge, the use of OSB is constantly extending and expanding the scope.
1. Wall panel field: LUJU INC took the lead in the experiment and research of OSB applied to exterior wall panel（Smart osb）, and successfully developed OSB as the substrate, one-sided veneer, and then grooving, spraying, and obtained a patent.
2. Application of OSB veneer: OSB veneer is applied to clear water template, carriage floor, basement floor. Paste single-layer or multi-layer solid wood veneer, so that OSB application space is more extensive, such as strong vibration environment, strong impact environment, long-term humid environment, friction environment.
3. Adding special additives and materials OSB: adding borate or copper preservatives can be made into anti-biodegradable OSB, with insecticidal, bactericidal, fire prevention function. New cement formwork; the use of high resin content of OSB, while veneering with smooth and medium density materials, can make the board has higher strength and durability, and can be used repeatedly.
4.Fiber Polymerization Reinforced Composite Reinforced OSB: Advanced oriented strand boards that use glass fiber reinforced composite materials to enhance the load bearing capacity of the edge of wood frame shear walls.
5. Special Process OSB: OSB characterized by high density, high strength, large format, ultra-thickness, ultra-thinness, etc. is being explored for applications in special fields. The surface is fine material, the middle is OSB structure of special OSB is being developed and utilized.
Conclusion
Since its emergence in the 1970s, OSB has gained wide recognition, and its application areas have been continuously explored and expanded. At present, the European OSB market is in full swing, but China's OSB market in general is still in the early stages of development of the traditional application areas can not be as dramatic as Europe and the United States, but the new application areas are constantly being explored, it is this reality that gives China OSB more reverie and development space. OSB will certainly play a role in more areas, and it will certainly be in China's wood-based panel industry. OSB will surely play a role in more fields, and it will surely shine in China's wood-based panel industry.
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