Multi-layer web formation section

A multi-layer web formation section has two successive wire units ( 300, 310 ) with a common wire ( 11 ). A first headbox ( 100 ) supplies fiber pulp to the first wire unit ( 300 ) forming a first partial web (W 1 ). A second headbox ( 110 ) supplies a new fiber pulp layer to the forward end of the second wire unit ( 310 ) atop the first partial web. A first non-pulsating dewatering zone (Z 1 b) in the forward end of a two-wire stretch of the second wire unit ( 310 ) has a first formation shoe ( 200 b) with a curved cap ( 201 ) placed on the side of the new layer having openings ( 202 ) extending through the cap ( 201 ) with an under-pressure (P) affecting therethrough. A two-wire stretch of the second wire unit ( 310 ) has a second pulsating dewatering zone (Z 2 b) formed by fixed dewatering lists ( 210 b), between which there are gaps ( 220 b) and an under-pressure (Pb) affecting in these.