摘要:
The invention relates to a headbox for a fiber web machine including a turbulence generator (13) equipped with flow pipes (14) to which at least one manifold (11, 11') is arranged to be connected using intermediate pipes (10). At least part of the intermediate pipes are arranged to extend within the flow pipe of the turbulence generator.
摘要:
The invention concerns a method for fluidisation of a pulp flow in the headbox of a paper machine or such. The characteristics of the pulp flow are affected in the headbox's fluidiser (14) in one step only, whereby the height (h1) of the step is at least equal to the average fibre length, and after the fluidiser (14) the biggest permissible step expansion in the flow channel in direction z is smaller than the average fibre length.
摘要:
Die Erfindung betrifft einen Stoffauflauf (10) für eine Papiermaschine mit einer sich quer zur Maschinenlaufrichtung (L) über die Maschinenbreite erstreckenden Düse (12), die eine untere und eine obere, sich jeweils über die Maschinenbreite erstreckende durchgehende Wand (14 beziehungsweise 16) aufweist, und mit einer zentralen Baugruppe (22), die einen durch die untere Düsenwand beziehungsweise die dieser zugeordnete Tragplatte (20) gebildeten unteren Arm, einen dazu vorzugsweise parallelen oberen Arm (24), ein einlaufseitiges erstes Zentralteil (26) und ein in Maschinenlaufrichtung (L) dahinter liegendes zweites Zentralteil (28) umfasst, wobei der obere Arm (24) und die beiden zwischen diesem und dem unteren Arm (20) angeordneten Zentralteile (26, 28) vorzugsweise Trägerelemente eines Turbulenzgenerators bilden. Die Erfindung ist dadurch gekennzeichnet, dass der obere Arm (24) und das hintere zweite Zentralteil (28) der zentralen Baugruppe (22) quer zur Maschinenlaufrichtung (L) jeweils segmentiert sind und dass das einlaufseitige erste Zentralteil (26) der zentralen Baugruppe (22) und die untere Düsenwand (14) quer zur Maschinenlaufrichtung (L) jeweils durchlaufend ausgebildet sind.
摘要:
A headbox (20) has a tube bank (28) of tubes (26) arranged in machine direction rows. The tubes (26) extend from an outlet wall (30) of a header to the inlet of a nozzle (42). The upper and lower walls (44, 46) of the nozzle (42) converge toward the nozzle outlet (48), and planes extending from the walls (nozzle roof and apron) converge to define an imaginary centerline extending in the cross-machine direction. The rows of tubes (26) lie along radially extending planes defined with respect to the centerline. The injection ends of the tubes define a cylindrical surface (64) extending between the nozzle walls (44, 46). Stock from each tube (26) is directed radially toward the centerline along flow paths (47) of equal length. Trailing vanes (68) may be positioned between the rows of tubes (26) so that each flow experiences almost identical flow boundary conditions as it moves towards the nozzle outlet (48), hence contributing to more uniform fiber orientation in the resultant paper web (51).
摘要:
A headbox apparatus (10) is disclosed for ejecting stock (S) onto a forming wire (12) for forming a web (W). The apparatus (10) includes a housing (14) which is connected to a pressurized source (P) of the stock (S). The housing (14) defines a tapered inlet (16) for the flow therethrough of the stock (S). The tube bank (18) has an upstream and a downstream end (20, 22) with the upstream end (20) being connected to the tapered inlet (16) such that the stock (S) flows at a substantially constant flow rate through the inlet (16) and through the upstream end (20) of the tube bank (18) to the downstream end (22) of the tube bank (18). The tube bank (18) includes a plurality of tubes (24, 25, 26, 27) for the flow therethrough of the stock (S). A member (28) defines a slice chamber (30) which has an upstream and a downstream extremity (32, 34). The upstream extremity (32) is connected to the downstream end (22) of the tube bank (18), and the downstream extremity (34) is disposed adjacent to the forming wire (12). The arrangement is such that the stock (S) flows through the downstream end (22) of the tube bank (18) and through the upstream extremity (32) of the slice chamber (30) so that the stock (S) is ejected from the downstream extremity (34) of the slice chamber (30) onto the forming wire (12). A plurality of supply conduits (36, 37) are connected to the upstream end (20) of the tube bank (18) with each supply conduit (36, 37) being connected to a stock diluting source (38) for permitting dilution of the stock (S) flowing into the tube bank (18). A control device (40) cooperates with the supply conduits (36, 37) for controlling the dilution of the stock (S) flowing through at least some of the tubes of the tube bank (18) for controlling the cross-machine directional basis weight of the resultant web.
摘要:
The invention relates to a headbox (1) for a machine for producing a fibrous material web (3), in particular a paper, cardboard or tissue web (3), from at least one fibrous material suspension (2), comprising a feeding device (4, 5) feeding the at least one fibrous material suspension (2), a perforated distribution pipe plate (6), which is arranged immediately downstream of the feeding device (4, 5) in the flow direction (R) of the at least one fibrous material suspension (2) and which comprises a plurality of flow channels (7) arranged in rows (Z; Z.1 to Z.3) and columns (S; S.1 to S.4), an intermediate channel (8), which is arranged immediately downstream of the perforated distribution pipe plate (6) in the flow direction (R) of the at least one fibrous material suspension (2) and which extends in the width direction (B) of the headbox (1) and comprises two walls (9.1, 9.2) preferably having the width of the machine, a turbulence generating means (10), which is arranged immediately downstream of the intermediate channel (8) in the flow direction (R) of the at least one fibrous material suspension (2) and which has a plurality of flow channels (11) arranged in rows (Z; Z.1 to Z.3) and in columns (S; S.1 to S.4), and a headbox nozzle (13), which is arranged immediately downstream of the turbulence generating means (10) in the flow direction (R) of the at least one fibrous material suspension (2) and which has a nozzle gap (14), wherein the feeding device (4, 5), the perforated distribution pipe plate (6) and the intermediate channel (8) are arranged in a first alignment plane (AE.1), and the turbulence generating means (10) and the headbox nozzle (13) are arranged in a second alignment plane (AE.2), and wherein the two alignment planes (AE.1, AE.2) form an angle (α) in the range of >90 and
摘要:
The invention relates to a headbox for a machine for producing a fibrous web from a fibrous suspension, having a feed device (4, 5) which feeds the fibrous suspension, having a distributor pipe perforated plate (6) which directly adjoins the feed device in the flow direction of the fibrous suspension, having an intermediate duct (8) which directly adjoins the distributor pipe perforated plate in the flow direction and which has two walls (9.1, 9.2), having a turbulence generating means (10) which directly adjoins the intermediate duct in the flow direction, and having a headbox nozzle (13) which directly adjoins the turbulence generating means in the flow direction, wherein the feed device, the distributor pipe perforated plate and the intermediate duct are arranged in a first plane of alignment (AE.1) and the turbulence generating means and the headbox nozzle are arranged in a second plane of alignment (AE.2), and wherein the two planes of alignment enclose an angle (α) in the range > 90° and
摘要:
Die Erfindung betrifft einen Stoffauflauf (1) einer Maschine zur Herstellung einer Faserstoffbahn aus mindestens einer Faserstoffsuspension (2), mit einer quer zur Maschinenlaufrichtung (L) sektionierten Verdünnungseinrichtung (3), insbesondere Siebwasserdosierungseinrichtung, der in Strömungsrichtung (S) der mindestens einen Faserstoffsuspension (2) ein sich quer zur Maschinenlaufrichtung (L) erstreckender Zwischenkanal (4), ein eine Vielzahl von Turbulenzkanälen (6) aufweisender und Teilmischströme (M T ) erzeugender Turbulenzerzeuger (5) und anschließend eine Stoffauflaufdüse (7) nachgeschaltet ist, die einen Strömungsraum (8) aufweist und die mit einem einen Faserstoffsuspensionsstrahl (12) liefernden Austrittsspalt (11) versehen ist. Der erfindungsgemäße Stoffauflauf (1) ist dadurch gekennzeichnet, dass der Zwischenkanal (4) und/oder der Strömungsraum (8) der Stoffauflaufdüse (7) durch mindestens eine mit der Verdünnungseinrichtung (3) beziehungsweise mit dem Turbulenzerzeuger (5) mittels wenigstens einer Lamellenhalterung (9'; 9) verbundene und zwei von mindestens einer Faserstoffsuspension (2) berührte Strömungsflächen (F O ', F U '; F O , F U ) aufweisende Lamelle (10'; 10) unterteilt ist, dass wenigstens eine der beiden Strömungsflächen (F O ', F U '; F O , F U ) der mindestens einen Lamelle (10'; 10) mit einer zumindest bereichsweise strukturierten Oberfläche (13'; 13) vorgesehen ist, wobei die Strukturierung vorzugsweise derart gewählt ist, dass eine Vermischung der aus der Verdünnungseinrichtung (3) austretenden und in den Zwischenkanal (4) eintretenden beziehungsweise aus dem Turbulenzerzeuger (5) austretenden und in die Stoffauflaufdüse (7) eintretenden Teilmischströme (M T ) zumindest erschwert, vorzugsweise nahezu vollständig verhindert wird.