| 摘要 |
A method for slot extrusion coating a liquid composition at a coating temperature and a coating speed at or above 40 m/min, said liquid composition having a viscosity at said coating temperature of at least 500 mPa.s at a shear rate of 100 s<SUP>-1</SUP>, comprising the step of : (i) selecting said liquid composition for slot extrusion coating having a tan d of less than 1000 measured by oscillatory dynamic viscosity measurements at 1 Hz, the coating temperature and a shear stress of 250 Pa under conditions in which there is effectively no variation in shear stress within said liquid composition during said measurement, said liquid composition being selected from liquid compositions each comprising at least one binder and a liquid carrier medium; and (ii) slot extrusion coating the composition via a slot onto a web support with a bead vacuum at the coating temperature and the coating speed. |
