In order to form stacks, of which each forms a book block, folded sheets are provided with an adhesive application or layer of adhesive before they are placed on one another. The scan line driving circuit supplies a scan signal to exclusively select scan lines in each of a plurality of horizontal periods. An embedded region of the ring possesses a detailed geometry which helps ensure that a delamination would be localized and unable to propagate from the first to the second compartment, maintaining the structural integrity of the filter device. Eccentricity of the mounting of the second encoder is measured against the more accurately mounted spindle control encoder and compensated by a digital clock generating system using a digital phase locked loop. The chemically prepared toner includes agglomerated toner particles have a unimodal particles size distribution with a number average particle size ranging from about 5. Accordingly, the valve cartridges achieve an improved flow rate to volume relationship.