Abstract: A method for curtain coating various compositions at high speed onto a continuously moving receiving surface comprisesa) forming a composite layer of a plurality of coating compositions having density .rho. of total volumetric flow rate per unit width Q, forming a freely falling curtain from said composite layer, and impinging said freely falling curtain of height h against a continuously moving receiving surface such that the point of impingement has an application angle .theta.,b) providing said receiving surface with roughness, R.sub.z (DIN), between about 2 .mu.m and about 20 .mu.m,c) providing an electrostatic field at said impingement point whereby high coating speeds can be attained, andd) providing said coating composition forming the layer adjacent to said receiving surface with a viscosity measured at a shear rate of 10,000 s.sup.-1 sufficiently high that, when combined with said roughness R.sub.z, said curtain height h, said application angle .theta.

Abstract: A method for curtain coating various compositions at high speed onto a continuously moving receiving surface comprisesa) forming a composite layer of a plurality of coating compositions having density .rho. of total volumetric flow rate per unit width Q, forming a freely falling curtain from said composite layer, and impinging said freely falling curtain of height h against a continuously moving receiving surface such that the point of impingement has an application angle .theta.,b) providing said receiving surface with roughness, R.sub.z (DIN), between about 2 .mu.m and about 20 .mu.m, andc) providing said coating composition forming the layer adjacent to said receiving surface with a viscosity measured at a shear rate of 10,000 s.sup.-1 sufficiently high that, when combined with said roughness R.sub.z, said curtain height h, said application angle .theta., said total volumetric flow rate per unit width Q, and said minimum liquid density .rho., gives a value of specifying parameter .phi..sub.

Abstract: In curtain coating, uniform layer or layers are only obtained if the operational variables are held within precise limits. These limits define a "coating window". However, one of the boundaries of this "window" is governed by the occurrence of air-entrainment. Described herein is an improved coating process in which allows the "coating window" to be enlarged. This is achieved by using a material adjacent the support on to which the liquid material is to be coated which readily shear-thins.