| 摘要 |
<p>The improvements consist in arranging, in the inner wall of the processing drum, which rotates in two directions, a series of receptacles which are open at the top, oriented in the manner of generatrices, and delimited by the end planes of the cavity, with the bottom thereof forming an angle of some 100 to 110 degrees with respect to a tangent to the periphery at the point of incidence thereof and with a tilt towards the central part of the two end sections of said bottom thereof. Provision is made for a ball valve which balances the internal pressure with atmospheric pressure simultaneously at the beginning of the opening of the drum.</p> |
