Apparatus for drying webs of photographic paper or the like

US4245397A · kind A · utility

Assignee

• AGFA-Gervaert AG · DE

Inventors

• Erwin Laar · Taufkirchen, DE
• Friedrich Ganser · Straubing, DE
• Thomas Hammer · Munich, DE

Key dates

• Filing date: Jul 18, 1978
• Grant date: Jan 20, 1981
• Expiry date: Jul 18, 1998

Classification

• Technology area (CPC G): Physics
• CPC primary: G03D15/022
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Apparatus for drying webs of photographic paper has a drying unit which has an inlet for admission of wet webs. Such webs advance along discrete paths having V-shaped portions and are dried by hot air which is circulated by blowers. The temperature of air is maintained at a constant value by a control system which adjusts one or more air heaters in the drying unit. The latter has a portion which is adjacent to and is located at a level below the inlet and wherein the moisture content of air is higher than in other parts of the drying unit. Such moisture content is measured and the signals denoting the measured moisture content are used to control the operation of a device which withdraws moisture-laden air from the aforementioned portion of the drying unit. The withdrawn air is replaced with relatively dry atmospheric air entering the drying unit via outlet opening for the webs.