Back to results
US 6,413,580 B1Granted
Method and device for applying powder on mobile sections of printing sheets
AssigneeWeitmann & Konrad GmbH & Co. KG
InventorsReiner Haas, Günther Hess
Life of this patent
Estimating the term…
Abstract
The invention concerns a method and a device for applying powder on sections of printing sheets (2). The invention includes a powder airflow (8) enclosed in a protective airflow (13) such that the powder airflow is steady and protected against the action of possible disturbances until it reaches the sections of printing sheets (2).
Claims13
A process for applying powder on a moving printed sheet (2), comprising the steps of:
- adding powder to an airflow (8) directed at the printed sheet (2), whereby the powder is transported by the airflow (8) to the printed sheet (2), and wherein the powder airflow (8) that carries the powder is at least partially surrounded along a length of the powder airflow before the powder airflow strikes the printed sheet, by a powderless supporting airflow (13) directed substantially parallel to, and being immediately flanking, the powder airflow so as to touch the powder airflow (8) along the length thereof, before the powder airflow strikes the printed sheet, for supporting and protecting the powder airflow (8).
A device for applying powder on a moving printed sheet (2), comprising:
- a first nozzle (9) for discharging an airflow (8) loaded with powder, which is directed at the printed sheet (2), and at least one additional nozzle (12) arranged substantially parallel to the first nozzle is provided for discharging a powderless supporting airflow (13) substantially parallel to the powder airflow that at least partially envelops, is substantially parallel to, and touches the powder airflow (8), along a length of the powder airflow before the powder airflow strikes the printed sheet, for supporting and protecting the powder airflow (8) directed at the printed sheet (2).
Dependencies are inferred from the claim text.