Dampening method and apparatus using an air nozzle and mist generator
US4811661A · kind A · utility
Inventor
Key dates
| Filing date | Dec 18, 1987 |
| Grant date | Mar 14, 1989 |
| Priority date | — |
| Expiry date | Dec 18, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41F7/30
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A novel dampening unit for an offset press is proposed, comprising a nozzle (20) with a discharging mouth (21) in the form of a slit directed substantially at a tangent to an outer surface of the plate (6a) and extending in the axial direction of the plate cylinder (6), which discharging mouth (21) is disposed near the plate surface. The interior of the nozzle (21) is divided into upper and lower chambers (20a, 20b) from the innermost area thereof to the discharging mouth (21) by a partition (22) extending in the direction of an air stream over the whole length of the nozzle (20). A device for generating an air stream, such as a fan (23) is disposed within the upper chamber (20a) and a device for generating a mist such as an ultrasonic generator (27) is disposed within the lower chamber (20b). According to this structure, the mist sucked out from the lower chamber (20b) can be stably and effectively held on the plate surface while sandwiched between the plate surface and an air film formed by the air stream ejected from the upper chamber (20a).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.