| 摘要 |
<p>There is described a sheet-fed or web-fed screen printing press, especially for the production of banknotes and like securities, comprising an impression cylinder (2a), a first screen printing unit (2b) cooperating with the impression cylinder (2a) for applying a first ink pattern (A) onto successive sheets or web portions, at least a second screen printing unit (2c) cooperating with the impression cylinder (2a) for applying a second ink pattern (B) onto the successive sheets or web portions, which second screen printing unit (2c) is located downstream of the first screen printing unit (2b) with respect to a direction of rotation of the impression cylinder (2a), and an intermediate drying unit (10) located between the first and second screen printing units (2b, 2c). The intermediate drying unit (10) is adapted to perform superficial drying of the first ink pattern (A) applied by the first screen printing unit (2b) before application of the second ink pattern (B) by the second screen printing unit (2c), which superficial drying involves only the drying of an outer superficial portion (S) of the first ink pattern (A). Preferably, the second screen printing unit (2c) is adapted to apply the second ink pattern (B) in close proximity to the first ink pattern (A) or at least in a partially overlapping manner onto the first ink pattern (A).</p> |
