Device and method for application of coating powder
AssigneePerma Press AB
InventorEgil Norheim
Life of this patent
Estimating the term…
Abstract
A device for application of coating powder in a process including a conveyor with an air permeable conveyor surface for conveying a base sheet in a direction of travel, wherein the base sheet is coated with at least one layer upstream of the conveyor, and a powder-applying device, arranged to apply coating powder onto the base sheet. A device for directing a jet of air towards the base sheet is also arranged downstream of the powder applying device such that the jet of air effectively removes any excess coating powder from the base sheet. A suction device is also arranged to create an under-pressure beneath the conveyor surface, causing the base sheet to be pulled towards the conveyor surface, and forcing the excess coating powder to pass through the conveyor surface.
Claims16
Device for application of coating powder in a process, comprising
- a conveyor with an air permeable conveyor surface for conveying a base sheet in a direction of travel, said base sheet being coated with at least one layer upstream said conveyor,
- a powder-applying device, arranged to apply coating powder onto said base sheet,
- means for directing a jet of air towards said base sheet arranged downstream said powder applying device such that said jet of air effectively removes any excess coating powder from said base sheet, and
- a suction device arranged to create an under-pressure beneath said conveyor surface, causing said base sheet to be pulled towards said conveyor surface, and forcing said excess coating powder to pass through said conveyor surface,
- wherein said means for directing a jet of air is connected in fluid communication with said suction device, which receives air that has been removed from beneath said conveyor surface.
Device for application of adhesive powder in a screen transfer printing process, comprising
- a conveyor with an air permeable conveyor surface for conveying a base sheet in a direction of travel, said base sheet being coated with at least one layer upstream said conveyor,
- a powder-applying device, arranged to apply adhesive powder onto the base sheet being conveyed by the conveyor,
- means for directing a jet of air towards the base sheet arranged downstream said powder-applying device, said jet of air effectively removing any excess adhesive powder from the base sheet, and
- a suction means arranged to create an under-pressure beneath said conveyor, causing the base sheet to be pulled towards said conveyor, and forcing excess adhesive powder through said conveyor surface,
- wherein said means for directing a jet of air is connected in fluid communication with said suction means, which receives air that has been removed from beneath said conveyor surface.
Method for application of coating powder in a screen or offset printing process, comprising the steps of:
- applying coating powder onto a base sheet, previously at least partly coated with at least one coating layer,
- applying a flow of air towards said base sheet, thereby removing excess coating powder, and
- applying under-pressure beneath a surface supporting said base sheet, thereby retaining said base sheet to the surface and forcing excess powder through said surface,
- wherein said step of applying under-pressure removes air from beneath said conveyor surface, and the air thereby removed is used to form the flow of air applied towards the base sheet.
Dependencies are inferred from the claim text.