| 摘要 |
<p>The proposed invention is an engraved roll, fully or largely made from an aluminium alloy, to the cylindrical surface of which a screen surface consisting of cell-recesses of calculated volume is applied. An oxide-ceramic layer 15-50 mu m thick and with microhardness 700-1500 Hv, which adequately reproduces the external surface of the screen, is formed on the screen surface by the plasma electrolytic oxidation process. The great hardness and strength of the oxide-ceramic layer make it possible for the cells of the screen to retain their correct dimensions and shape for a long period of exploitation of the roll. The additional impregnation of the porous oxide-ceramic layer with metal or organic materials still further hardens the screen surface, increases its corrosion resistance and imparts to it the required special properties (lipophily, hydrophily, hydrophoby et al.) for different systems for the dosed transfer of liquids and suspensions.</p> |
