Reinforcing patch plate applied to liquid passage hole in filter- surfaced expressing sheet on expressing filter plate

摘要

A reinforcing patch plate comprises a boss portion adapted to be fitted in a liquid passage hole, such as one for filtrate or wash liquor, which is open to a filter surface of a filter-surfaced expressing sheet, a liquid guiding flange portion integrally formed on one end of the boss portion to cover the portion of the expressing sheet around the liquid passage hole, and a core embedded therein to serve as an intermediate layer. The liquid guiding flange is provided on its face with liquid guiding outlet grooves which establish communication between the boss portion and the filtrate grooves of the filter surface of the expressing sheet. The liquid guide grooves are each defined between adjacent ridges arranged side by side on the flange portion and removably attached to the latter.