| 摘要 |
PROBLEM TO BE SOLVED: To obtain a hollow granular material as a basic product or the like for agriculture, foresty and fisheries such as feed, fertilizer and mushroom culture soil and to provide both a die for molding the granular material and the hollow granular material obtained by the die for molding. SOLUTION: A die tip 20 is constituted of both a center rod pedestal 21 having the taking-in holes 24 for a raw material and a center rod 27 connected to the center rod pedestal 21. The die tip 20 is detachably provided in the inside of a die hole 12 of the body 11 of a die. While the raw material is cooked and agitated, it is taken into the die through the taking-in holes 24 of the die tip 20 and is extruded from the die hole 12 and forcedly molded. At this time, a hollow granular material which has a hollow part conformable to the cross-sectional shape of the center rod 27, is molded by the die hole 12 and the center rod 27. |
