But what exactly happens from the time raw logs enter the yard to when they exit the facility as engineered OSB panels and head to the jobsite? Why do we debark the logs and what do we do with all those chips? Is there a science behind controlling strand thickness? The balance of safely working together with so many moving parts was hard to compile under seven minutes.
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Learn More. Forestry Sustainable Forestry Western U. Forests Southern U. Then, in a separate operation, they are passed over mesh screening to filter out different sizes. Larger strands are selected for the surface layers of OSB panels while smaller strands are used for the core layers. A: The different strand sizes are blended in a rotating drum with resins and wax. Strands with resin and wax are then transported to the orienters. The orienters align the strands so that strands for the top and bottom surfaces of the panel go one way while the interior strands go in the opposite direction.
This adds stability to the panels. A: Before it goes into the press, the mat can be up to eight inches thick. After the mats go into the press, they are pressed at about PSI, at up to degrees Fahrenheit. Pressure brings the strands into close contact with one another and the heat cures the resin. A: Each press opening has platens and the press platens are heated with a hot oil system. When the OSB panels come out, they can be more than degrees F.
A: Panels go from the press to the finishing line where they are cut to the length and width needed. For example, at the facilities where flooring panels get tongue and grooved, or EdgeGold has the DownPore system cut in, these final steps are taken. All products are sampled and tested for quality.
In the flooring sector they serve as laying boards tongue and groove profile. They are used for visible floors, in roof finishing and as facades because of their distinctive appearance, including in furniture construction for shelves and as frames for upholstered furniture.
Several OSB panels glued together can be used as wall and ceiling elements in timber house construction. The aim was to produce a board with approximately the same technical properties as plywood, but using sufficient, rapidly renewable wood materials with a smaller trunk diameter. Long, slender strands are specifically used for the production, which are aligned and pressed in layers during the production process.
The classic OSB board consists of 3 layers. Here, the top layer strands oriented in the direction of production hence the name OSB maximise the bending strength of the board. In Russia, several new plants have recently been put into operation.
Flakes or strands must be graded into different fractions according to their size in order to form the layers of the panel. During gluing, a precisely dosed amount of adhesive is added to the strands and evenly distributed. The strands reach the spreading heads via discharge and distribution rollers.
The surface layers are aligned in the direction of production, the central layer at right angles. Both the weight of the spread mat and the proportions of surface layer to middle layer are permanently monitored by scales. In the press the glue is cured under the influence of pressure and temperature and the mat is pressed to the specified thickness.
Before further processing, the panel must be conditioned in a cooling star until the storage temperature is reached. The calibration of the raw panels is a refinement of the surface and is considered an important quality factor in panel production. They are then compacted with a mixture of waxes and resins. The next step involves layering the strands into inches deep mats on a belt measuring feet in width.
There are environmental controls that clean exhaust air. Extreme heat, electrostatic precipitators, and beds of channel filter VOCs and ash before discharge.
Pressing is the next crucial stage. Here, the mats are baked with temperatures over F and under high pressure varies with board thickness , but on average, it is psi. After coming out of the presses, the OSB sheets are cut into sizes.
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