METHOD FOR DRYING OF WOOD BLANKS AND INSTALLATION FOR ITS REALIZATION Russian patent published in 2002 - IPC

FIELD: wood working, in particular, process of conveyer drying of wood blanks in a radio-frequency (r.f.) field, drying of prepacked wood blanks inclusive. SUBSTANCE: the method of conveyer drying of wood blanks consists in their heating in a radio-frequency field between horizontally oriented plate electrodes 4,5 of the working capacitor in drying chamber 2 with a simultaneous feed of air to chamber 2 and exhaust of it from the upper part of chamber 2; in accordance with the invention blanks 13 are installed with their end surfaces perpendicularly to the vector of the electric field strength, blanks 13 are so arranged that their lower end surfaces would be positioned above the level of the surface of conveyer belt 3, forced air blowing of blanks 13 is effected by heated air fed under the lower end faces of blanks 13. The installation for realization of the method has radio-frequency generator 1, drying chamber 2 accommodating upper and lower plate electrodes 4,5 of the working capacitor, conveyer belt 3 for movement of wood blanks 13 through drying chamber 2 between electrodes 4,5 of the systems of air feed to the drying chamber, and at least single hole 11 for air exhaust located in the upper part of drying chamber 2, the installation has rectangular-shaped containers 12 positioned on conveyer belt 3 for installation of blanks 13 in them in the vertical position, the containers have side walls and a row of rectangular partitions 14, the partitions and the side walls of the container parallel to them are provided with horizontal side bosses positioned above the bearing platforms under the edge sections of the lower end faces of blanks 13, one of the walls of container 12 that is perpendicular to the vertical partitions has slotted opening 16 in the lower part made lengthwise the wall to a height corresponding to the level of arrangement of the horizontal side bosses, the installation system of air feed is made in the form of air heater 7 with fan 8 connected through pipe-line 9 to tubular distributors 10 installed lengthwise conveyer belt 3 with the outlets inside chamber 2 at the level providing air passage through slotted openings 16 in the walls of containers 12, containers 12 are positioned on conveyer belt 3 so that their slotted openings 16 would face the outlets of the tubes of air distributors 10. EFFECT: process of radio-frequency drying fitted to wood blanks with a various shape of cross- section, to prepacked blanks inclusive. 3 cl, 3 dwg positioned above the bearing surface of container 12 and forming the bearing platforms under the edge sections of the lower end faces of blanks 13, one of the walls of container 12 that is perpendicular to the vertical partitions has slotted opening 16 in the lower part made lengthwise the wall to a height corresponding to the level of arrangement of the horizontal side bosses, the installation system of air feed is made in the form of air heater 7 with fan 8 connected through pipe-line 9 to tubular distributors 10 installed lengthwise conveyer belt 3 with the outlets inside chamber 2 at the level providing air passage through slotted