WEB FORMING DEVICE

The invention relates to a sheet forming device (1) for a Fourdrinier machine (100) for producing a web of fibrous material (2), in particular a web of paper, card or packaging paper, from at least one fibrous material suspension (3). The sheet forming device (1) comprises at least one circulating endless wire (4), a headbox (6), which produces a machine-wide jet (J) of fibrous material suspension by way of a headbox nozzle (7) and applies it to the endless wire (4), and two format-delimiting units (13), respectively attached both in the peripheral region of the endless wire (4) and in the region of the jet (J) of fibrous material suspension, wherein the format-delimiting units (13) have on the starting side at least one means (16) for detaching a peripheral strip (17) and on the outer side, and preferably directly downstream of the means (16) for detaching the peripheral strip (17), a means (18) for carrying away the detached peripheral strip (17). The invention is distinguished by the fact that the means (16) for detaching the peripheral strip (17) comprises a blade (19), consisting at least of two blade regions (19.1, 19.2), wherein two blade regions (19.1, 19.2) of the blade (19) are aligned in relation to each other at an angle (W) of > 90°.