Vented main roll for a press assembly in a paper machine

摘要

A roll (12) for use in a paper machine includes a roll shell (42) having an inner periphery (34). A roll cover (48) is positioned around the roll shell (42) and has an outer surface (36). The roll cover (48) and/or the roll shell (42) include at least one main flow channel (50) positioned radially inward from the outer surface (36) and radially outward from the inner periphery (34). The roll cover (48) includes at least one secondary flow channel (52) in communication with each of the outer surface (36) and at least one main flow channel (50). <IMAGE>