초록 ▼

A screw-type front extrusion granulating apparatus for forming moistened powdered raw material such as chemicals for use in the agriculture, pharmaceutical, or food industries into granules, has a conveying screw in axial alignment with a semi-spherical die, the die having a plurality of die opening

A screw-type front extrusion granulating apparatus for forming moistened powdered raw material such as chemicals for use in the agriculture, pharmaceutical, or food industries into granules, has a conveying screw in axial alignment with a semi-spherical die, the die having a plurality of die openings formed therein. The conveying screw has an extrusion blade mounted to its forward end to project into the confines of the semi-spherical die, the contour of the extrusion blade generally conforming to the inner surface of the die. In operation, the moistened powdered material is transported forwardly under pressure by the screw and extruded through the die utilizing the pressure of the screw and the scraping action of the extrusion blade.

대표청구항 ▼

A screw-type extrusion granulating apparatus for extruding a moistened powder material into granules, said apparatus comprising a housing defining a screw chamber for receiving said moistened material, a rotatably driven conveying screw disposed in said screw chamber for pressurizing conveyance of s

A screw-type extrusion granulating apparatus for extruding a moistened powder material into granules, said apparatus comprising a housing defining a screw chamber for receiving said moistened material, a rotatably driven conveying screw disposed in said screw chamber for pressurizing conveyance of said moistened powder material through said screw chamber, and a die supported in axial alignment with said conveying screw and extending axially from one end of said screw chamber, said die being of a generally uniform thickness in the shape of a dome and having a plurality of extrusion openings of substantially uniform size and shape formed therethrough in a generally uniform array over substantially the entire surface area thereof, said extrusion openings being oriented radially with respect to the dome shape of said die and being of a cross-sectional dimension approximately the same as the thickness of said die, said conveying screw having a terminal end extending axially interiorly of said die in the shape of a dome spaced from said die and an extrusion blade having a blade edge, said extrusion blade projecting from said dome-shaped terminal end toward said die to terminate at said blade edge and said blade edge being curved in general correspondence to said die and being at a substantially uniform radial spacing from said dome-shaped terminal end, said extrusion blade applying a nipping action to said moistened powder material between said dome-shaped terminal end and said die to thereby facilitate movement of said moistened powder material generally uniformly into and through said extrusion openings to emerge therefrom as granules.