| 摘要 |
<p>The coating (10) of the fibrous web (1) is brought into contact with an indicator surface (2), during or after drying and before smoothing. After the fibrous web is led away from it, the indicator surface is inspected for coating adhesion. The fibrous web is brought into contact with a smooth indicator surface (2), which runs with the web. Some of the coating is scraped off directly after application. Following coating, drying is effected at least partially without contact. Optical inspection examines the indicator surface for coating adherence. To smooth the fibrous web, it is passed through smoothing nips. These are opened when the indicator surface demonstrates adherence, or the adherence exceeds a set limit. The indicator surface is cleaned after testing. It is arranged at least 20 meters ahead of smoothing, at which location the web takes 0.5-2 s to reach the first smoothing nip. In the equipment used, contactless drying is by infra red radiation, or hot air blowing. A camera is used for optical testing. The indicator surface is dark. It is on a rotating roller, especially a guide roller (9). It is cleaned by a rotary brush. A control unit connected to the testing unit (3), operates the smoothing rollers. An independent claim IS INCLUDED FOR corresponding test equipment.</p> |
