During pressing perpendicular to the plane of the plate, flat particles of wood are laid parallel to the plane of the plate, which ensures its high strength, since particles located along the stove axis are stretched along the fibers, and adhesive seams between the shavings are shifted.
When pressing along the plane of the plate according to the extrusion method (extrusion), particles are laid perpendicular to the plane of the plate. With stretching or bending, adhesive seams and wood are spent over the fibers, t. e. in the direction most disadvantageous for them, in connection with which the strength of these plates is many times less than the strength of the plates obtained by pressing perpendicular to their plane.
The second significant difference in these two methods of pressing is that by the first method, single -layer, three -layer and multi -layer slabs or slabs lined during pressing by various leaf materials can be obtained by various leafy materials.
In the production of plates, only single -layer and non -failed slabs, continuous or multi -route ones can be made by extrusion method; The edges of extrusion plates are rectangular and do not require pruning.
The schemes of the technological processes of the production of chips of the first group with pressing perpendicular to the plane of the plate can be divided into three types, namely: with periodic pressing in floor presses, with continuous-periodic pressing in a single-entertaining press and with continuous pressing in tape-senior presses. The quality obtained by these three ways in quality differs very little from each other.
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