| 摘要 |
<p>A mill having a grinding member carrying one or more fixed openings (37) at its periphery, wherein in the vicinity of the fixed opening(s) there is provided one or more variable openings (36), the fixed and variable openings permitting air to flow from beneath the grinding member to above the grinding member. This arrangement allows for good air flow control; air speed may be kept desirably low even when the mill must be run at a high mass flow rate.</p> |
