Printing press powder removal system
US5634401A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 25, 1995 |
| Grant date | Jun 3, 1997 |
| Priority date | — |
| Expiry date | Apr 25, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41P2235/31
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
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 un…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.