| 摘要 |
<p>This invention relates generally to the shaping of a blank carried out by filter-dehydration as it is obtained from a sludge-like solid/liquid mixture and, in particular, to the shaping of a blank in a resilient mould-grid containing the mould negative utilizing sludge obtained from ore-dressing installations. To date, there are no specific requirements regarding the shaping of blanks obtained in the above-noted manner since there appears hitherto to have been little or no knowledge regarding the significance of such requirements or of the relationship between shaping and function. The present invention proposes to provide a blank of a configuration such that the somewhat conflicting requirements regarding functionally optimal shaping can be largely fulfilled. Accordingly, the shaping of the blank is such that at least one projection of the blank onto a plane approximately at right angles to a surface of a filter has approximately a form of a trapezoid, the sides thereof which enclose an angle ?1 larger than 90.degree. merging into each other with a curve.</p> |
