Patent ID: 8042755
Filing Date: 2011-10-25
Classification: D21D

Abstract:
1. A mechanical refining system including opposing refiner plates, at least one of the plates comprising: a fibrous material inlet region radially inward of a refining surface and a refined fibrous material outlet radially outward of the refining surface; the refining surface including bars and grooves, wherein each of the bars has a leading edge between an upper sidewall section of a leading face and an upper ridge of the bar, wherein the upper ridge surface has a planer surface extending between the leading edge and a trailing edge of the bar; wherein the leading face is oriented towards a direction of rotation of the opposing plate and the leading edge has an interior angle of between 150 degrees to 175 degrees between the upper sidewall section and the upper ridge, and the upper sidewall section extends from the upper ridge to at least a middle of the leading face between the upper ridge and a bottom of one of the grooves adjacent the bar, and each of the bars has the trailing edge forming an interior angle less than the interior angle of the leading edge, and the trailing edge is between the upper ridge and a trailing face of the bar.