| 摘要 |
Ink-retentive rollers for use in printing, especially as metering rollers in printing with oily ink in the presence of water or a wetting additive, are made from rollers having a surface in which a pattern of ink-retaining cells is formed by coating this patterned surface with a thin layer of ink-retentive material and then removing all or part of the excess coating on the surface outside the cells. The method of making these rollers is especially applicable to rollers of solid ceramic or having a surface layer of ceramic on a core, and to sleeves which are carried on base rollers. The preferred ceramic is chromium oxide, and the preferred coating is copper. Rollers with other surfaces, for example chromed surfaces, can also be improved in this way. The main advantage is greatly reduced wear in use. |
