Patent ID: 7896276
Filing Date: 2011-03-01
Classification: D21D

Abstract:
1. A refiner plate for mechanical refiner of lignocellulosic material, the refiner plate comprising: a refining surface including bars and grooves, wherein the bars each have opposite sidewalls extending radially outward along the plate and the bars each include an upper section including an upper edge and a lower section including a root at a substrate of the plate; the upper section of each of the bars has a narrow width between the sidewalls, and a draft angle with respect to the sidewalls in a range of greater than zero degrees and less than five degrees, and the lower section of the bars has a wide width greater than the narrow width of upper section and a draft angle of at least five degrees on at least one sidewall of the bar, wherein the draft angle extends along the sidewall of the lower section from the upper section to the root.