| 摘要 |
An offset printing press, having a raised horizontal catwalk platform along one longitudinal side, uses a spray powder to help keep them separated within a stack of sheets in a sheet discharge section of the press. Only a portion of the spray powder is used and excess spray powder is present in the air as powder-laden air. The present invention comprises a system for removal of excess spray powder from the powder-laden air and includes a containment chamber, a powder removal section and an air handling unit. The containment chamber is formed by providing first and second side panels which combine with a rear panel of the sheet discharge section to provide a general containment for removal of powder-laden air from the sheet discharge section. A downward flow of air through at least one exhaust vent into a filter unit of the powder removal section is made possible by the air handling unit. The filter unit includes at least one prefilter and at least one main filter for removal of spray powder from the powder-laden air. Clean air from the filter unit is exhausted into the print shop by the air handling unit. The powder removal section and the air handling unit are preferably placed under a top surface of the horizontal catwalk platform to save floor space in the print shop. This system is successful in removing 90-95 percent of the spray powder from the powder-laden air without adding to the heating and cooling requirements of the print shop.
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