Abstract: The manufacture of fine powder from vegetable fiber materials at relatively low cost and without contamination, wherein the manufacturing system involved is equipped with a pressure roller system having a couple of pressure rollers, each having teeth of wave-shaped cross section and teeth bottoms, with both such rollers being placed opposite to each other with a minimal space in between same and arranged for synchronous revolution, and with the present invention comprising such processes as to pressure feed the vegetable fiber raw materials to said pressure roller system to mill the aforesaid raw materials with such pressure roller system, and after multiple repetition of said milling process, to pulverize flaked raw materials resulting from the aforesaid milling process with a flake breaker.