Abstract: An improved screen plate for a pressure screening apparatus and a method for making the basket are disclosed wherein prestressed areas are provided at each end of each slot formed in the screen plate for minimizing crack propagation.

Abstract: An improved efficiency screen plate for screening pulp in a pressure screening apparatus is disclosed wherein various design parameters are established which increase screen performance, particularly in screening medium consistency pulp. The basket is formed of thin, sheet-like material formed without machining into an undulating pattern. Undulation frequencies, slot location, turbulence bar frequency, and turbulence bar height are established for increasing screen performance.

Abstract: A coiled spring system (20) particularly suited for use in a bowl mill (10) of the type that is employed for purposes of effectuating therewithin the pulverization of material such as coal. It is through the operation of the subject coiled spring system (20) that there is established the magnitude of the forces which the grinding rolls (18) of the bowl mill (10) apply to the coal for purposes of accomplishing the pulverization of the coal. The subject coiled spring system (20) includes stud bearing housing means (36), preload stud means (38) suitably supported from the stud bearing housing means (36), pressure spring means (40) positioned in surrounding relation to the preload means (38), and spring housing means (42) encircling the pressure spring means (40).

Abstract: A journal bearing system (50, 52) particularly suited for use in a bowl mill (10) of the type that is employed for purposes of effecting therewithin the pulverization of material such as coal. The function of the subject journal bearing system (50, 52) is to provide the bearing support for the journal shaft (22, 54) on which the pulverizer roll (20) is mounted that through the coaction thereof with a suitable surface (14) provided for this purpose effects the pulverization of material.