Clean waste liquid defecation method, plate washing method, and plate washing facility

摘要

PROBLEM TO BE SOLVED: To bring about excellent washability of ink adhering onto a plate and enable clarification of a washing liquid.SOLUTION: A method for clarifying a washing waste liquid used to wash a removal relief printing plate W for removing an unnecessary part of ink from the ink applied onto a blanket B1 includes a solid matter removing step of clarifying and reclaiming the washing waste liquid by removing solid matter from the washing waste liquid including the ink after washing by using a cross-flow type ultrafiltration device as solid matter removing means 72.SELECTED DRAWING: Figure 1