US 5,195,684 AGranted

Screenless disk mill

AssigneeCurt G. Joa, Inc.

InventorEdmund Radzins

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Abstract

The circular housing of a fiberizer mill has a rotationally driven shaft on which there is a disk haivng a conical face and spaced apart rows of teeth. A stationary disk has on its face a multiplicity of annular grooves which define teeth. There is a small gap between the tips of the rotary teeth and the tips of the stationary teeth. The gap extends at an acute angle relative to vertical plane passing perpendicular to the shaft axis so that particles being disintegrated experience a horizontal component of force. The result is that particles, after having been exploded by striking the teeth on the stationary disk, are emitted generally radially outwardly from the gap. Hammer bars on the periphery of the rotary disk are surrounded by a toothed circular breaker plate member concentric to the orbital path of the hammers on the rotary disk. The flow of fibers and particles outwardly of the gap between the rotary and stationary disks continues into the path of the hammers which smash the particles against the teeth of the circular breaker plate. The plate has a gap in it through which the air entrained fibers are passed to an outlet.

A disk mill for breaking pulp into fibers comprising:

a housing including spaced apart opposite walls, one of the walls having a slot for feeding pulp sheets into the housing and a rotationally driven shaft extending through the opposite wall into the housing,
a curved breaker plate member arranged in the housing generally concentric to the axis of the shaft and radially spaced from the shaft, the curved radially inwardly presented sides of the breaker plate member having teeth, said breaker plate member extending axially across the space between the walls of the housing, the breaker plate member having a gap for fibers produced within the breaker plate member to flow to an outlet in the housing,
a stationary disk mounted adjacent one wall in the housing, the disk having a slot aligned with said slot in the wall for allowing the leading edge of a sheet of pulp to enter the housing,
the disk having a conical face presented inwardly of the housing and having a plurality of concentric serrations on said face,
a rotary disk mounted to said shaft, said rotary disk having a direction of rotation and a conical face that is complementary in shape to the conical face of said stationary disk and is positioned adjacent said conical face of the stationary disk,
a plurality of angularly spaced apart radially extending rows of teeth on said conical face of the rotary disk, said teeth in the rows projecting axially of the disk in close proximity to but in nonintermeshed fashion with the serrations on said stationary disk to provide for pulp particles that result from the pulp sheet fed through said slot in the stationary disk being engaged by rows of teeth to be driven against said serrations for causing the pulp to break into fibers as the pulp and fibers are advanced radially along said serrated face of the stationary disk, and
hammer members extending radially from said rotary disk for sweeping past said teeth on the breaker plate member to further break up pulp that is discharged from between said disks.

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Abstract

Claims12