Bison-werke Bahre & Greten Gmbh & Co Kg

Harry Neubauer

Berndt Greten

Kurt Lamberts

Jurgen Leppin

Gunter Seeger

Albert De Mets

Gunter Bucking

Hans J Komp

Wilhelm Oldemeyer

A method and an apparatus for the continuous manufacture of particle board from a mat of cellulose based material in the form of particles, fibers or the like, together with at least one heat hardenable binder, features a high frequency heating station 4 disposed between a scattering station 2 and a finishing press 9. The mat 3 scattered in the scattering station 2 is continuously fed on an endless conveyor band 1 through a working gap defined between upper and lower electrode plates 5 and 6 of a high frequency capacitive heating arrangement in the high frequency heating station 4. A recirculating cover band 7 contacts the upper surface of the mat and the mat is moved with full-area contact between the upper and lower electrode plates 5 and 6, i.e. without any form of air gap. Several variants are described, in particular the upper and lower electrode plates 5 and 6 can be constructed to compress the mat to a certain degree. In the FIG. 2 embodiment several sequential pairs of electrode plates 5, 6; 5', 6' are used to heat the mat in stages with compression 10 taking place between sequential pairs of electrodes.

Apparatus and method for the manufacture of particleboard

An arrangement for processing ligno-cellulose containing particles for the manufacture of wood-product plates. These have layers of oriented chips, and a chipper comminutes raw material. The fine material and dust are separated by a sifting device, and the sifted chips are provided with binder material by a gluing device. The chipper produces more chips of as great a length as possible than are required for forming of at least one cover layer of a mat. Behind the chipper, there are provided a wet-chip bunker and a dryer. The sifter separates the chips, obtained after removal of the fine material and the dust, into two fractions. The chip composition of one of these fractions, during the processing time, constantly contains chips which are as long as possible and which are more than that required for forming the mat layer. The other fraction has shorter chips obtained during chipping, and both fractions are present each in at least one bunker. A feeder supplies a part of the chips that are as long as possible from the first fraction to the chips of the second fraction. The feeder may be arranged between the sifter and the bunkers.

Installation and process for processing of ligno-cellulose for the

Methods and apparatus are described for the manufacture of particle board in which a fleece of particle material with admixed binder is formed on an endless belt 1 at a forming station and is subsequently passed through a series of presses and heating devices where it is consolidated into particle board. The lower, and preferably also the upper, covering layers of the fleece are selectively warmed at the forming station to activate the cold binding capability of the admixed binder and endow the fleece with sufficient stability to withstand the handling stresses as it is passed from one endless band conveyor to another. pa The selective warming is conveniently achieved by means of respective heating devices each of which incorporates a number of pairs of oppositely poled capacitor plates arranged alternately side by side along the length of the fleece and extending over the full width thereof. In this way longitudinally extending field lines pass between the capacitor plates and penetrate to a required depth in the associated covering layer. In an alternative embodiment, in which the fleece is conveniently deposited in sequential layers on the endless band fleece carrier, the first layer, which forms the lower covering layer is warmed by passing it between a pair of capacitor plates.

Method for the manufacture of particle board

Poorly conducting substances, such as chips of cellulose material containing a heat hardenable binder, are heated by passing them between the plates of an operational capacitor supplied with energy from a high frequency generator. An adjustable auxiliary capacitor is connected in parallel with the operational capacitor and is adjusted to match the capacity of the output circuit to the generator with changing conditions of the poorly conducting substances. Coarse initial control is effected by adjusting the separation of the plates of the operational capacitor. The apparatus is especially useful for making chip boards and the like in which a precompressed mass of chips is passed between the plates of the operational capacitor sandwiched between two endless belts.

Method and apparatus suitable for heating relatively poorly conducting

Particleboard made from particles in the form of chips or fibers or the like is made by distributing a mass of chip material onto an endless belt conveyer system. The mass of material is subsequently passed to a precompressor, a high frequency preheating device, a further press and a finishing press. The unheated further press serves to reduce the thickness of the material to substantially that of the finished board prior to its consolidation by temperature and pressure in the finishing press. A further endless belt contacts the surface of the material and runs through the precompressor, the high frequency heating device and the further press and serves to counteract any tendency of the chip material to expand after leaving the precompressor. This endless belt additionally yields a number of other significant advantages, in particular a reduction of loss of heat from the material prior to reaching the finishing press.

Process and an apparatus for the continuous manufacture of boards from

A high frequency industrial generator, especially suitable for supplying power to a device for heating an electric poorly conducting substance such as a fleece of a cellulose material, comprises two hollow concentrically disposed conductors each of square section and supporting respective electrode plates of an associated capacitor. All the plates are vertically disposed and lie at right angles to the walls of the respective conductors. In the middle of the electric plates there is situated a triode electron tube electrically connected to the plates to form an oscillating circuit. The anode potential and cooling water supply for the electron tube is located within a field free space inside the internal conductor. One set of electrode plates can be adjusted relative to the other to adjust the frequency and the arrangement ensures only low electrical losses are incurred.

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Springe, Germany

Harry Neubauer