Coating apparatus

A coating apparatus of the extruder type which applies a coating solution onto the surface of a flexible support running continuously along rear edge and doctor edge surfaces by continuous extrusion of the coating solution from a frontmost end of a single slot, the improvement wherein said rear edge surface is curved and said doctor edge surface is smoothly curved in an arcuate fashion having a constant radius, and an exit end at a point B of a slot at a rear edge surface in a cross section of said coating apparatus is located at a position that satisfies the relation .theta..sub.1 <.theta..sub.2 <180.degree., where .theta..sub.1 is an angle formed by a tangential line drawn to said rear edge surface at said point B and a tangential line drawn to said doctor edge surface at a point A at a downstream end of said doctor edge surface in a cross section of said coating apparatus, all of said apparatus being contained within an interior of said angle .theta..sub.1, and .theta..sub.2 is an angle formed by said tangential line drawn to said rear edge surface at said point B and a tangential line drawn from said point B to said doctor edge surface, all of said apparatus being contained within an interior of said angle .theta..sub.2.