초록 ▼

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

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.

대표청구항 ▼

A system in combination with an offset printing press for removing excess spray powder in said offset printing press; said printing press having a sheet feeder section for feeding stock sheets through at least one printing unit which receives and prints said sheets; a sheet delivery section to trans

A system in combination with an offset printing press for removing excess spray powder in said offset printing press; said printing press having a sheet feeder section for feeding stock sheets through at least one printing unit which receives and prints said sheets; a sheet delivery section to transfer printed sheets from a last of said printing units having a powder spraying device for dispensing powder on said printed sheets and a heater for drying said printed sheets while being transferred; a sheet discharge section adjacent said sheet delivery section for receiving said discharged sheets from said sheet delivery section; said printing press having a length defined generally by said sheet feeder section, at least one printer unit, sheet delivery section, and sheet discharge section being disposed in series; and a raised horizontal catwalk platform disposed adjacent an exterior of said printing press along at least a portion of said printing press length for servicing of said printing press, said system comprising: a containment chamber formed within said sheet discharge section which includes a first side panel arranged on one side of said sheet discharge section, and a second side panel arranged on an opposite side of said sheet discharge section to provide a general containment for removal of powder-laden air from said sheet discharge section; a powder removal section for removing powder from said powder-laden air including a filter unit located below said horizontal catwalk platform and connected to said containment chamber to receive said powder-laden air and filter said air; said filter unit having at least a first pre-filter and at least one bag filter disposed downstream of said pre-filter to substantially remove said spray powder from said powder-laden air to provide essentially clean air; and an air handling unit in air flow communication with said containment chamber and said powder removal section to establish an air flow through at least said containment chamber and said powder removal section to convey said powder-laden air for powder removal and exhaustion of said clean air to ambient.