| 摘要 |
PURPOSE:To ensure stable coating almost free from a streak trouble even under high speed and thin film conditions by setting the viscosity of the bottom layer when the coating liquid of the bottom layer adjacent to a support has a specific solid density. CONSTITUTION:In simultaneous multilayer coating using a stride hopper device, if an insoluble solid content of 2 to 15w/v% exists in water containing an application liquid which forms a bottom layer adjacent to a support, the viscosity of the bottom layer is adjusted in accordance with the solid content. The viscosity of this bottom layer has a relationship with the solid content of the coating liquid for the bottom layer as expressed by a quadric equation, i.e., 2<=C<=8.8f(C)=0.7C<2>-12.33C+61.47, 8.8<=C<=14f(C)=2.0C<2>-35.24C+162.4 where C is the density of a solid component. A thicker is used for viscosity adjustment. In this way, stable coating almost free from a streak trouble can be performed even under high speed and thin film conditions. |
