Patent ID: 8070350
Filing Date: 2011-12-06
Classification: B01F,B28B,B29C

Abstract:
1. A clay extruder comprising: a drum including a supply port for feeding a clay, an extrusion port through which the clay is extruded to form a columnar or a rectangular-columnar article, and a screw having a rotary shaft and a spiral rotary blade extending along the rotary shaft which feeds the clay under pressure while kneading the clay fed into the screw by a rotation of the rotary blade, wherein the screw has a pressure raising portion in a supply port side of the drum to feed the clay under pressure while kneading the clay, and a rectifying portion in an extrusion port side of the drum to rectify the clay fed under pressure along the rotary shaft into the columnar shape, the rectifying portion has a rectifying rotary blade configured so that a rotary blade angle gradually decreases as the rectifying rotary blade approaches the extrusion port, the rotary blade angle being formed between a face of the rectifying rotary blade that faces the extrusion port and a central line of the rotary shaft the rectifying rotary blade extends beyond an end of the rotary shaft in a direction toward the extrusion port and is configured so that the sectional shape of the rectifying rotary blade cut along the direction perpendicular to the rotary shaft is gradually reduced outwardly in a diametric direction of the drum, and expands along an inner wall of the drum, as the rectifying rotary blade comes close to the extrusion port, the end of the rotary shaft is tapered, and an interval of the rectifying rotary blade in a rotary shaft direction is longer than that of the rotary blade of the pressure raising portion in the rotary shaft direction.