LAMINATED FILTER FOR FILTERING BEER

摘要

PROBLEM TO BE SOLVED: To provide a laminated filter which is used for filtering beer and has both a high microbe-filtering performance and a long filtering life on the filtration of the beer. SOLUTION: This filter produced by laminating anisotropic precise filtration membranes comprising a hydrophilic polymer-containing polyetersulfone or polysulfone is characterized by laminating a membrane having a lactobacillus- removing value LRV of 4 to 5.5 and an average water flow rate of 125 to 155 ml/min.cm<2> at 52±1 cmHg on the secondary side to a membrane having a lactobacillus-removing value LRV of 2 to 4 which is lower than that of the secondary side membrane, and an average water flow rate of 160 to 210 ml/ min.cm<2> at 52±1 cmHg on the primary side.