Die Erfindung betrifft ein Verfahren sowie eine Vorrichtung zur Beeinflussung des Feuchtequerprofils einer Papier-, Karton-, Tissue- oder einer anderen Faserstoffbahn (1) in der Pressenpartie zur Entwässerung der Faserstoffbahn (1) einer Maschine zur Herstellung und/oder Veredlung derselben, in der die Faserstoffbahn (1) gemeinsam mit wenigstens einem wasseraufnehmenden Entwässerungsband (4,5) durch zumindest einen Pressspalt läuft.

Dabei ist erfindungswesentlich, dass wenigstens ein Entwässerungsband (4,5) nach der Wegführung von der Faserstoffbahn (1) von wenigstens einer Düsenanordnung (6) in einem sich quer zur Bahnlaufrichtung (14) erstreckenden Korrektur-Abschnitt, in dem der Feuchtegehalt der Faserstoffbahn (1) zu hoch oder zu niedrig ist, mit einem gasförmigen Druckmedium beaufschlagt wird, wobei das Druckmedium auf die mit der Faserstoffbahn (1) in Kontakt kommende Seite des Entwässerungsbandes (4,5) gerichtet wird, wenn der Feuchtegehalt der Faserstoffbahn (1) in diesem Korrektur-Abschnitt zu hoch ist und das Druckmedium auf die nicht mit der Faserstoffbahn (1) in Kontakt kommende Seite des Entwässerungsbandes (4,5) gerichtet wird, wenn der Feuchtegehalt der Faserstoffbahn (1) in diesem Korrektur-Abschnitt zu niedrig ist.

Die Erfindung betrifft einen Nassteil (1) für eine Maschine zur Herstellung einer Faserstoffbahn (3), insbesondere Papiermaschine zur Herstellung holzfreier Papiere, umfassend eine Siebpartie bildende Blattbildungsvorrichtung (4) und eine dieser nachgeordneten Pressenvorrichtung (5). Die Erfindung ist dadurch gekennzeichnet, dass die Blattbildungsvorrichtung (4) als Hybridformer (6) oder Gapformer (7) ausgeführt ist, wobei die Blattbildungsvorrichtung (4) frei von einer Siebsaugwalze ist, und die dieser nachgeordnete Pressenvorrichtung (5) lediglich einen einzigen Pressspalt (9) aufweist, der von einer doppelt befilzten Ein-Spalt-Presseneinrichtung (8) gebildet wird, wobei die Abnahme an der Blattbildungsvorrichtung (4) vorzugsweise mit einer Abnahmeeinrichtung, insbesondere einer Abnahmesaugwalze (12) erfolgt.

An apparatus for a papermaking machine, comprises an active airfoil (32) having a wall defining a web-supporting surface (44) adjacent to which a paper web travels in the papermaking machine, the wall defining openings (49) through which air is discharged to form an air layer along the web-supporting surface for supporting and stabilizing the paper web; and a measuring device (60) integrated into the active airfoil and directed from the web-supporting surface onto the paper web for measuring at least one property of the paper web, the measuring device being operable to measure the web property from only one side of the web. According to the invention said measuring device (60) is a non-traversing measuring device that is arranged to measure said at least one property at a plurality of locations spaced along the paper web.

Method and device for the formation of a paper or board web (W) out of a fibrous material in a wire part which consists of a lower-wire loop (20), which is horizontal at the initial end of its upper run, and of an upper-wire loop (10) jointly operative with said lower-­wire loop. After the initial dewatering carried out in the single-­wire dewatering zone (20a) through the lower wire (20), the fibre layer (W) is passed over a lower-wire (20) support system (30) constituting a direct extension of the single-wire zone (20a), in the area of which said support system (30) dewatering by the effect of gravity through the lower wire (20) is prevented. With web qualities of higher grammage, after the single-wire dewatering zone (20a), the web (W) is passed to an initial part of the twin-wire dewatering zone, which is determined by the above support system (30) placed inside the lower-wire loop (20) and by a suction and foil equipment (40) placed opposite to it inside the upper-wire loop (10). Dewatering is carried out within the initial part through the upper wire (10). When thinner web qualities are being produced, the suction and foil equipment (40) is placed apart from contact with the lower wire (20) placed facing it (Fig. 1). After the above web formation stages, there follows a twin-wire dewatering section, which takes place within an upward short sector (a) of a forming roll (16) fitted inside the upper-wire loop (10), whereupon the twin-wire forming zone is curved downwards, being guided by a forming shoe (26) with a relatively large curve radius (R).

Method and device for the formation of a paper or board web (W) out of a fibrous material in a wire part which consists of a lower-wire loop (20), which is horizontal at the initial end of its upper run, and of an upper-wire loop (10) jointly operative with said lower-­wire loop. After the initial dewatering carried out in the single-­wire dewatering zone (20a) through the lower wire (20), the fibre layer (W) is passed over a lower-wire (20) support system (30) constituting a direct extension of the single-wire zone (20a), in the area of which said support system (30) dewatering by the effect of gravity through the lower wire (20) is prevented. With web qualities of higher grammage, after the single-wire dewatering zone (20a), the web (W) is passed to an initial part of the twin-wire dewatering zone, which is determined by the above support system (30) placed inside the lower-wire loop (20) and by a suction and foil equipment (40) placed opposite to it inside the upper-wire loop (10). Dewatering is carried out within the initial part through the upper wire (10). When thinner web qualities are being produced, the suction and foil equipment (40) is placed apart from contact with the lower wire (20) placed facing it (Fig. 1). After the above web formation stages, there follows a twin-wire dewatering section, which takes place within an upward short sector (a) of a forming roll (16) fitted inside the upper-wire loop (10), whereupon the twin-wire forming zone is curved downwards, being guided by a forming shoe (26) with a relatively large curve radius (R).

A method for forming a paper or paperboard web from a fibrous material in the wire section of a paper making machine or equivalent machine comprising a bottom wire loop (2;102) with the main portion of its top run being horizontal or substantially horizontal, and a top wire loop (10;110) working in conjunction with the bottom wire loop; wherein in the method fibre slurry coming out of the headbox (1;101) of the paper making machine is fed to the first part (2a; 102a) of the top run of said bottom wire loop (2;102), which forms the first dewatering zone after which the partly formed fibre layer is led to the second dewatering zone, in the area of which said top wire loop (10;110) moves to cover said partly formed fibre layer in such a way that water removal from the fibre layer continues it least in two stages in the area of said second dewaterlng zone, whereupon the top wire loop (10;110) is separated from the nearly formed web (W) that is led to follow the run of the bottom wire loop (2;102) forward to the next processing stages of the web (W), wherein the method is characterized in that in the single-wired dewatering zone (2a;102a), after the initial water removal is carried out through the bottom wire (2;102), water removal through the bottom wire (2;102) is prevented by means of an element group (9; 109) operating in contact with the inner surface of the horizontal top run of the bottom wires; that in said water-removal pre­vention area water is removed from the web (W) through the top wire in the first stage or stages of the double-­wired second dewatering zone, which stages comprise a relatively long, planar wire table extending from the headbox to the forming roll (6 in Fig. 1), or from the headbox to the last supporting element (109 in Fig. 2); and that after the first dewatering stage or stages of the double-wired zone water is removed in a curved double-­wired dewatering zone (b) (Fig. 1) or zones (R_o, C) (Fig. 2), after which the web (W) is led to follow the bottom wire (2;102).

All of the essential operating parts for adding a top former assembly to a new Fourdrinier paper machine or for converting an existing Fourdrinier paper machine into a top former are carried by a supplemental frame assembly (100) which can be mounted on the main Fourdrinier frame (10) with minimal modification of the latter except the addition of simple parts for securing the supplemental frame assembly on top of the main frame. The primary operating parts of the top wire assembly are a hollow open faced roll (125) and a top wire deflector (150) which cooperate to collect and deliver liquid expressed through the top wire (110) into a receptacle (195) that is carried by the supplemental frame assembly, and special provision is made for utilizing the top wire deflector to correct for irregularities in the cross machine profile of the paper sheet as it is being formed. Provision is also made for operating the resulting top former in roll former mode, blade former mode, or a combination roll and blade former modes.