| 摘要 |
<p>A screw mill (1), for example, used for producing fine powder grains of calcium carbonate used as bulking agent for paper comprises a continuous screw (70) and discontinuous vanes (72) which enable efficient grinding both of slurry and dry materials without causing clogging of the mill. The clearance between the hub (44) and the rotor (52) can be finely adjusted by a screw type adjustor (54). This makes it possible to easily adjust the grain size and to produce ground materials having a spheriodicity of 0.3 to 0.03 which are best suited for the bulking agent for paper.</p> |
