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. The purpose of this website is to provide you with information for the realisation of your project and to establish contact between you and suitable technology partners. We use our own and third-party cookies, such as Google Analytics, in order to optimise our services and, if necessary, to better qualify your enquiry.
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Since the moisture content of the strands ranges from 40 to 75 percent, they are dried to 5 to 10 percent moisture in large, rotating single-pass or triple-pass dryers with an inlet temperature of as high as 1, o F.
Dried strands are classified into two sections using various sizes of screen. Larger strands are used for the face layers while the smaller strands are laid out in the core layer. Face and core layer strands are mixed separately with an exterior binder in a drum-type rotating blender.
Depending on the process, a certain percentage of wax and other chemicals also can be applied during the blending process. Figures 1 and 2 illustrate strand orientation of typical OSB and a general manufacturing flow chart of OSB, respectively. Figure 2. A general flow chart of OSB production.
From J. Oriented Strand Board and Waferboard. Engineered Wood Products. PFS Research Foundation. Strands coated with one of these resins are ready for mat formation, which is the most important process determining properties of the panel. A simple design of spinning disks is used in the forming of the strands. Face and core layers of the mat are oriented opposite each other and sequentially dropped on the conveyor belt. The mat thickness depends on the final thickness of the pressed panel and its density.
In a general OSB plant, forming lines are about 6- to 8-feet wide. South Log Sales. Recreation With millions of acres across the U. Resources State Regulations National Organizations. Our Programs. Log In. Contact Us. Real Estate Development Projects Aggregates. Energy We're committed to clean, renewable options that meet environmental standards and coexist with sustainable forestry.
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