Abstract: An insertless perforated mill roll body adapted to be detachably sleeved upon a roller shaft for the grinding of a fluid-containing material such as sugar cane and extracting fluid such as sucrose juice therefrom. The insertless perforated mill roll body includes a plurality of shish-ke-bab-like fluid channel strings to be encased in the roll body, each fluid channel string including a hollow fluid channel preferably defined by a channel wall member which generally extends between the two axial ends of the roll body with a plurality of fluid passage members affixed thereto. The roll body is formed by casting a castable material such as cast iron or steel to enclose the fluid channel strings, whereupon a hollow center bore is provided to receive the shaft therethrough. Each fluid passage member contains at least one generally radially extending fluid passage to allow communication between the outer periphery of the mill roll body and the fluid channel.

Abstract: A juice extracting mill roll is provided with a plurality of juice channels connected with a plurality of juice inlet passages. The juice inlet passages have a longer dimension in an axial direction and a shorter dimension in a circumferential direction. Each juice inlet passage has a passage extension projecting into the juice channel to form a juice trap. Alternatively, a juice trap can be formed with each juice inlet passage intersecting the respective juice channel at a leading or lagging portion of the juice channel relative to the direction of rotation of the roll, and the opposite lagging or leading portion of the juice channel being shut off from the juice inlet passage.