DEVELOPING BLADE AND ITS MANUFACTURING METHOD

摘要

A developing blade ( 11 ) comprises a blade member ( 14 ) located along one side edge of a support member ( 12 ) and having a surface shape defined by a maximum height roughness Ry of 0.35 to 4.5 mum and a length ratio under load tp (at a 30% cut level) of 15% or less. Such a developing blade is manufactured by bringing a top mold ( 2 ) having a mold surface ( 2 A) with a cavity ( 4 ) formed for the formation of a blade member and a gate ( 6 ) in communication with the cavity ( 4 ) in alignment with a bottom mold ( 3 ) having a flat mold surface ( 3 A) such that at least a part of the support member ( 12 ) is positioned in the cavity ( 4 ), clamping together both the top and bottom molds, and pouring a molding material from the gate ( 6 ) to fill in the cavity ( 4 ).