| 摘要 |
The disclosure concerns a coating device for coating a web which travels over a counter-roller. Upstream of a doctor blade for spreading the coating composition is a coating composition application chamber that includes a resilient tongue e.g. a leaf spring, which extends downstream toward the doctor blade and defines a hydrodynamic pressure slot between the tongue and the web. A pressure space for the coating composition is defined between the downstream end of the tongue and the doctor blade. The tongue is oriented to gradually narrow the height of the hydrodynamic pressure slot between the tongue and the web, and the tongue is resilient or resilently supported for this purpose. An additional retention wall helps close off the pressure space. The pressure space helps avoid air inclusions in the coating composition and creates a quiescent zone upstream of the doctor blade enabling uniform application of the coating. |
