| 摘要 |
<p>An orifice plate 18 for use in a grinder for grinding material, has a plate member defining a first surface and a series of relatively small outer grinding orifices 30 extending through the plate member. A series of spaced collection passages 32 are formed in the plate member located inwardly of the grinding orifices toward the centre of the plate member and a series of individual entryways 34 are formed in the first surface of the plate member, each entryway leading directly into one of the collection passages from the first surface of the plate member. <IMAGE></p> |
