be printed is limited only allowing comparatively wide ink lines 30 to be printed onto a printing material 20 the printable line width a is a function of the printing material side width d of the opening 9 of the passage 3 which approximately corresponds to the width i of the squeegee side opening 9 i e d u2248 i the width i of the squeegee side opening 9 is a multiple of the diameter d of a coated thread of fabric i e i gt gt d in the exemplary embodiment of the printing screen 10 shown in fig1 the channel walls 8 of the passage 3 have an angled orientation fig3 a to 3f illustrate alternative geometric shapes of the channel walls 8 which are likewise considered to be advantageous for instance in the embodiment of fig3 a the channel walls 8 have a concave shape in the embodiment shown in fig3 b the channel walls have a convex shape in the embodiment shown in fig3 c similar to the embodiment of fig1 the channel walls 8 are substantially angled but in the printing material side end region of the passage 3 they are shaped to be perpendicular to the surface of the printing screen.