Patent ID: 7624939
Filing Date: 2009-12-01
Classification: B01F,D21B,D21D

Abstract:
1. A kneader comprising: a casing having a papermaking material supply opening and a papermaking material outlet located below the papermaking material supply opening; at least first, second, third and fourth rotational shafts provided inside the casing; first blades attached to the first rotational shaft; second blades attached to the second rotational shaft; third blades attached to the third rotational shaft; and fourth blades attached to the fourth rotational shaft, wherein the first rotational shaft and the second rotational shaft are disposed at the same height and are arranged parallel to each other, the third rotational shaft and the fourth rotational shaft are disposed at the same height and arranged parallel to each other, the third rotational shaft is located under the first rotational shaft and the fourth rotational shaft is located under the second rotational shaft, respectively, wherein the first blades comprise first feed blades and first return blades which are alternately attached to the first rotational shaft; the second blades comprise second feed blades and second return blades which are alternately attached to the second rotational shaft; the third blades comprise third feed blades and third return blades which are alternately attached to the third rotational shaft; and the fourth blades comprise fourth feed blades and fourth return blades which are alternately attached to the fourth rotational shaft, and wherein each of the feed blades feeds a papermaking material from a side of the supply opening to a side of the outlet, and each of the return blades returns the papermaking material from the side of the outlet to the side of the supply opening so that when the papermaking material is transferred by the first to fourth blades, the papermaking material is not smoothly transferred from the supply opening to the outlet and can stay longer in the casing.