Maschinenfabrik J. Dieffenbacher Gmbh Co.

Dieffenbacher Gmbh Maschinen-und Anlagenbau

Werner Hoffman

Friedrich B Bielfeldt

Gernot Von Haas

Gerhard M Melzer

Ulf Konekamp

The invention relates to a method for preheating a pressed material mat () spread on an endlessly and continuously circulating molding band () during manufacture of wood material boards, wherein microwaves from one or both press surface sides are beamed into the pressed material mat () to preheat the pressed material mat () and the pressed material mat () is compacted and hardened by application of pressure and heat after transfer to a continuously operating press (). The invention consists of microwaves in a frequency range of 2400-2500 MHz being used to heat the pressed material mat (), wherein the microwaves for each press surface side are generated from 20 to 300 microwave generators () with magnetrons () of a respective output of 3 to 50 kW. A device for preheating pressed material mats () is also provided, in which 20 to 300 microwave generators () with magnetrons () with an output of 3 to 50 kW and with a frequency range of 2400-2500 MHz are arranged in a conveyor furnace () per area side.

Method and device for preheating a pressed material mat during manufacture of wood material boards

Veneer panels which are to be joined in a plurality of layers one above the other and one behind the other are assembled and glued to form an endless strand of veneer laminates. In the process, the veneer panels are first fed in through a glue-application machine which applies a layer of glue on a top side of the veneer panels onto a buffer belt. The veneer panels are then transferred from the buffer belt to a horizontally reversing feed belt which forms on a roller table a first veneer assembly comprising a plurality of veneer panels. The first veneer assembly is raised about its front end by an angle .alpha. into an oblique position so that veneer panels of a subsequent veneer assembly can be threaded into the first veneer assembly using the horizontally reversing feed belt. The first and subsequent veneer assemblies are thereby combined into a veneer-panel strand, and transferred to a continuously operating prepress and press.

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Eppingen, Germany

Werner Hoffman