Method and apparatus for equalizing the density distribution of pressed wood panels
AssigneeCarl Schenck AG
InventorDieter Arnold
Life of this patent
Estimating the term…
Abstract
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.
Claims11
A method for equalizing the density distribution in pressed wood panels manufactured from adhesive coated bulk material comprising measuring the weight distribution over a transverse cross section of the bulk material as the material is flowed from storage onto a forming belt, producing command signals representative of such weight distribution, comparing those signals to a signal representative of a predetermined nominal density distribution over the transverse cross section of the material flow path, and removing weight quantities along the transverse cross section where the command signals indicate excess weight distribution to thereby produce equal density distribution throughout the pressed wood panel.
Apparatus for manufacturing pressed wood panels comprising a hopper, a feeder for supplying the hopper with adhesive coated bulk material, the discharge width of the hopper corresponding to the spreading width for the pressed wood panels to be manufactured, devices below the discharge of the bottom belt hopper for downwardly transporting the bulk material in the form of continuous chip mass onto a forming belt, a material guide surface extending the entire spreading width, a weight measuring surface next to the material guide surface for determining the weight of the flowing bulk material at various transverse locations along the spreading width, control means for comparing the weight determined by the measuring surface with a nominal weight value for the particular transverse location being weight measured and thereafter producing a control signal representative of the comparison, and adjustment means at the discharge of the hopper along the entire spreading width for varying the flow of bulk material at the various transverse locations in response to the control signals.
Dependencies are inferred from the claim text.