Rotating disc wood chip refiner

Details Rotating disc wood chip refiner Rotating disc wood chip refiner

D - Textiles, Paper

21

D

D21D 1/30 (2006.01)

Patent

CA 2269980

A rotating disc wood chip refiner apparatus with an improved helical ribbon screw feeder comprising radially positioned right-hand and left-hand helical ribbon bars, each bar having a corresponding feeder outlet ring having a grid of skewed axial slots having a multiplicity of volumes, forming a continuous series of tuned resonant cavities. The slots in a feeder outlet ring corresponding to a right-hand helical ribbon bar are axially and uniformly skewed backwards (i.e. counter-clockwise) for a right-hand screw; and the slots in a feeder outlet ring corresponding to a left-hand helical ribbon bar are axially and uniformly skewed forwards (i.e. clockwise) for a left-hand screw, so that the helical ribbon bar/skewed axial slot-crossings are nearly parallel. A wave packet of forward travelling waves produced by the additional continuous series of tuned resonant cavities at the helical ribbon bar/skewed axial slot-crossings of the improved helical ribbon screw feeder described in this invention, can achieve a Bjerknes resonator action, with synergistic advantages to the usual continuous series of tuned resonant cavities at the refiner plate bar-crossings, at a frequency of half or integral multiples of the frequency of the wave packet of forward travelling waves, which can be adjusted to a family of resonant harmonic vibrations ranging from about 800 hertz to about 30,000 hertz, and provides a longer refining residence time, and achieves increased surface properties for a stronger pulp and paper sheet formation.

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