| 摘要 |
<p>Drum includes a long section, in the form of a truncated cone, firmly connected to a base; a grid is provided for protecting the discharge valve against possible obstruction by the skins as well as for flattening the angle at the base of the drum. Blades, for entraining the skins are fixed in the wall of the drum and make an angle with the radial plane passing through the implanted edge of the blade. Thus the mechanical work effected on the skins is different according to the direction of rotation of the drum and so by turning the drum in the two directions two types of treatment can be effected in the same drum.</p> |
