Carl Schenck Ag

Dieter K Arnold

Method and apparatus are provided for equalizing the density distribution of pressed wood panels manufactured from adhesive coated bulk material. A bottom belt hopper has an outlet, the width of which is identical with the spreading width for the pressed wood panels being manufactured. Devices installed below the bottom belt hopper transport the bulk material as adhesive coated chip material onto a forming belt. Density deviations existing in the bulk material when it is removed from the bottom belt hopper are determined and correspondingly eliminated. If required, a density profile for a finished pressed wood panel is provided when the bulk material is taken from the bottom belt hopper.

Method and apparatus for equalizing the density distribution of pressed

A method for controlling the density distribution of bulk material in the manufacture of pressed wood panels includes the step of eliminating the irregularities in the bulk material stream as it flows to the forming station. Apparatus for accomplishing this result includes a pair of spaced apart parallel rollers that define an adjustable slotted opening through which the material passes. Rotation and oscillation of the rollers function to render uniform the density distribution of the bulk material stream.

Method and apparatus for controlling the density distribution of bulk

A press for the production of particleboard from a preformed mat of wood particles and a suitable binder has spaced apart frames aligned one after the other and first and second parallel press platens movable toward and away from each other. The improvement comprises motivating structure connected between the first press platen and at least some of the frames for moving that platen to an extended position toward the second platen and against the preformed mat to thereby close the press. Dimensionally stable support structure positioned between the press frames and the first press platen maintains that platen at its extended position while preventing bending or arching thereof. Actuator structure connected between the press frames and the second press platen moves that platen toward the first platen and against the preformed mat while maintaining the second platen substantially parallel to the first to thereby press the preformed mat. Separating the press procedure into a closing step and a pressing step produces particleboards having a high degree of thickness precision.

Pressing apparatus for making particleboard

The present apparatus deposits a fleece of wood chips, particles or shavings on a conveyor belt for manufacturing panels. In order to avoid a uniform orientation of all particles in one direction and to assure an orientation of the particles in all directions in substantially uniform distribution, there is provided a particle flow disturbing device for disorienting the chips, particles or shavings as they are directed toward a conveyor belt. The particle flow disturbing device includes a plurality of screens, which intersect at a common axis, which is located slightly above and across the conveyor belt and which extends normal to the direction of movement of the conveyor belt. The wood chips are directed downwardly through the screens by an air current flowing generally in parallel to the conveyor belt to mix the descending wood chips. The common intersection axis of the screens is located upstream of the opposite edges of the screens with respect to the air current. The lowermost screen extends in parallel to the belt and the opening angles between adjacent screens is preferably the same.

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Darmstadt, Germany

Dieter K Arnold