| 摘要 |
Cleaning apparatus (10) comprises an enclosed washtank (12) and a screen loading unit (13). A pump is arranged to deliver high pressure heated water to an internal screen cleaning nozzle arrangement (14) and a ring-shaped external screen cleaning nozzle arrangement (15) which nozzle arrangements (14, 15) are arranged in a gap (19) between a screen support skid (16) and an entry screen support skid (17). The nozzle arrangement (14) is arranged to direct a spray of water outwardly; the nozzle arrangement (15) is arranged to direct a spray of water inwardly. In use, a cylindrical printing screen to be cleaned is pushed into the apparatus whilst high pressure heated water is being delivered by the internal and external nozzle arrangements (14, 15). As each portion of the screen is disposed opposite the gap (19), between support skids (16 and 17), that portion of the screen is washed on its inside and outside by water directed from the nozzle arrangements (14 and 15) respectively. The screen is pushed into the washtank (12) until the whole length of the screen has passed opposite the gap (19). The cleaned screen is then removed. Water directed from the nozzle arrangements (14, 15) is arranged to contact opposite sides of the screen at superimposed positions so that substantially no resultant force is incident on the screen during cleaning. The use of high pressure, heated water may result in the cleaning of screens at relatively low flow rates of water. |
