FI110528B - Hardware in connection with the headbox of a paper machine / board machine - Google Patents

Description

110528

Hardware associated with the headbox of a paper machine / board machine A paperboard / board mask 5

The invention relates to an apparatus for combining a dilution flow with a paper machine / board machine headbox to adjust the basis weight of the paper web / board web 10 basis flow from the manifolds of the paper machine / board machine.

The applicant's prior patent applications F1901593, FI933027 and FT 942780 are known as so-called. a dilution headbox, which is a headbox structure in which the basis weight of the web is adjustable from the width of the web by introducing the desired dilution flow through the control valves at different widths of the headboard and adjusting the amount of such flow. The dilution flow is mixed with the mass flow derived from the headbox manifolds. The dilution flow may be a pure or fibrous liquid. The dilution water may thus be, for example, tap water taken from the web as retention. 1 2 3 4 5 6

In the solution according to the application it is proposed that the diluent, preferably 2 dilution water, for controlling the basis weight of the paper / board web is introduced via the valves 3 along the diluent channels at different widths 4 of the headbox of the paper machine / board. Control of the dilution flow in the respective dilution fluid channel is effected by means of a control valve associated with the channel. The invention discloses that the diluent 6 is introduced into separate mixing chambers, which according to the invention are formed by using separate detachable joining partitions which may have been preferably formed by casting or separately machining from a metal blank, for example milling or turning. Further, in this application, it is proposed that the dilution fluid be introduced into said mixing chamber through a separate tube which opens. 30 one or more points in the mixing chamber. The invention provides the following advantages: 2 110528

Allows flow channel design at a reasonable cost, e.g. the downstream channel can be shaped to be curved.

Intermediate fins, or partitions, can be manufactured with a smaller (less expensive) machine tool casting or other finite production method, thereby reducing the need for a machine with a large dimension and precise machining.

Likewise, the dilution water feed tube may be manufactured as a loose end product. The need for a large and precise (expensive) machine tool is then reduced.

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Maintenance (cleaning) of the loose dilution water inlet pipe is easier than machining (the machined feed channel always has bends which make it difficult to clean / inspect the channel).

15 - Changing (tuning) the headbox flow conditions afterwards is easier. By modifying the dilution water inlet pipe (design, diameter, pivoting / size / position of the water outlet openings), it is possible to influence the flow characteristics (flow resistance) of the column in question and thereby the headbox speed profile and further the orientation profile.

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The invention is characterized by what is stated in the claims.

The invention will now be described with reference to some preferred embodiments of the invention shown in the figures of the accompanying drawings, but which are not intended to be limited thereto.

Figure 1A is a side elevational view of a paper machine / board machine headbox. The diluent for adjusting the basis weight of the paper / board web is directed to the desired width of the headbox, as shown in the figure, in connection with the tubes of the manifold after the manifold 30.

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Fig. 1B is a top view of the headbox from above the manifold.

In Figure 2 is shown in Figure IB, the structure in Figure IB, the direction of the arrow Kb.

Figure 3A shows the formation of a mixing chamber using shaped partitions that are separately connected to the top and bottom plates of the tubular structure.

Fig. 3B is a separate view of the so-called partition module of Fig. 3A. handle. The partition module is formed by casting or other sandwich production method and can be secured to the grooves of the top and bottom plates by their shoulders.

Figure 4A shows various partition structures that can achieve the desired mixing of dilution flow and mass flow.

Figure 4B is a sectional view I-I of Figure 4A.

Figure 5A shows some alternative ways of forming the partition structure.

Figure 5B is a sectional view ΙΙ-Π of Figure 5A.

Figure 6A shows a preferred embodiment of the wall structure according to the invention. The view is from above the area of the manifold Jj from the headbox.

Figure 6B is a sectional view III-III of Figure 6A.

Figure 6C is a sectional view IV-IV of Figure 6A.

Figure 7A shows a separate removable mixing / throttling nozzle to be positioned and attached between removable ribbed partitions comprising a flow port (s). The view is from above on the manifold Jj and in cross section.

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Figure 7B is a sectional view V-V of Figure 7A.

Figure 7C shows various embodiments of agitator / throttle nozzle.

As shown in Fig. 1A, the headbox 10 of the paper machine / board machine comprises a manifold 11 after a manifold J1}, and then an intermediate chamber 12 which opens into an equalization chamber 13. After the intermediate chamber 12 there is a turbulence generator G. a lip cone 16 comprising lamellae 17a, 17a2, 17a3 as shown in the figure. The mass is further led from the lip cone 16 10 through the outflow gap to the forming wire H. As shown in the figure, the outflow gap after the lip cone 16 comprises the tip bar n and its adjustment mechanism 18. The position of the tip bar n can be adjusted by the adjustment spindles 19 and adjustment motors 20. The dilution fluid flow Lj is controlled by the valves V1, V2 ... The apparatus comprises a plurality of dilution flow manifolds OlfO2 ... across the width of the headbox so that the desired dilution flow can be brought to 15 widths at different widths by adjusting the dilution valve V2 ....

The dilution flow Lj is led from the dilution fluid manifolds J2 to the mass flow rate 1 ^ derived from the headbox manifolds Jt so that the basis weight of the web 20 can be adjusted to the desired width.

Fig. 1B is a top view, partially in section and partly in section, of the structure of Fig. 1A at the headbox manifold. 1

As shown in Figure IB, the dilution flow after the manifold Jt is led to the mixing chambers S1, S2, S3 ...

Fig. 2 is a view of Fig. 1B in the direction K i.

According to the invention, the partition wall 21a1,21a2 ... between the two mixing chambers can be separately placed and fastened to the fasteners 22a, 22b, preferably grooves, of the upper plate Fj and the lower plate 110528 5 F2 so that the upper fastener 23a, 21a2 ... preferably a shoulder, enters into a counter-fastener 22a of the upper plate Fj, preferably a groove, and a lower shoulder 23b of the partition wall 21aj, 21a2 ... the lower plate F2 enters a groove 22b. According to the invention, the partition wall 21aj, 21a2 ... can be made by casting. The advantages of casting are that the desired flow pattern for the mixing chamber is easily obtained. The partition wall 21a1,21a2 ... is thus a modular component which easily obtains the desired curved surface shape which cooperates with the surface shape of the second wall of the mixing chamber on the opposite side. Partition wall 21a1,21a2 ... is thus most preferably made by casting, but it can also be done by machining a separate wall blank by machine machining the desired wall shape to the wall blank. The wall blank can also be made by another method of deposit production. The wall blank can be separately positioned when the headbox is assembled in connection with the upper plate F1 and the lower plate F2 of the structure at their upper and lower fasteners 22a, 22b.

Figure 3A is an enlarged view of an embodiment of a wall structure. The partitions 21a1, 21a2 ... of the mixing chamber S1, S2 ... are made of removable partition modules, which are individually shaped to optimize the desired flow. Thus, the partition wall can most preferably be made by casting, or it can also be made of a separate sheet blank by machining (e.g. milling) it into the desired surface shape. As shown in the figure, the diluent is introduced into the mixing chamber from the top (or bottom) into a separate mixing chamber Sj, S2 .. through a separate opening 24a}, 24a2.

Fig. 3B is a separate view of one partition module 21a !. The module 21at shown in Fig. 3B 25 is a rib portion which, by its fasteners, can be positioned on a plate F above the headbox structure! its counter-fasteners 22a and its lower headbox plate F2 its counter-fasteners 22b. The figure shows one method of joint construction. It is clear that the connection can consist of a variety of different connection possibilities.

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Figure 4A illustrates various partition structures and diluent import solutions. Figure 4B is a section I-I of Figure 4A. As illustrated in Figures 4A and 4B, for example, a throttle point is formed prior to the point of introduction of the diluent (chamber by shaping shoulder d in modular partitions 21a1,21a2 ...). The introduction of the diluent in this solution is effected by means of a separate tube 24aj to be installed in the mixing chamber Sj. The tubes 24a1,24a2 ... preferably extend into the center of the mixing chamber and comprise a plurality of flow openings to flow the dilution flow into the mixing chamber. and may be rotatable about its central axis so that the direction of the dilution flow into the mixing chamber can be adjusted.

Fig. 5A shows the structural-forms of the partitions guiding the second mixing chambers S1, S2 ..., which can achieve the desired mixing of the dilution flow and the mass flow in the mixing chambers S1, S2 ... The view is a cross-sectional view of the headbox width.

Figure 5B is a sectional view ΙΙ-Π of Figure 5A.

v ;: 20 ;;; 1: The above figures show the mixing chamber in the space after the manifold J immediately in connection with the bellows 11. The mixing chamber structure according to the invention can also be used after the intermediate chamber in connection with the turbulence generator G.

Figure 6A illustrates another preferred embodiment of the invention.

. ·: ·. Figure 6B is a sectional view ΙΙΙ-ΙΠ of Figure 6A.

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Figure 6C is a sectional view IV-IV of Figure 6A.

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In the embodiments shown in Figs. 6A-6C, a relatively complex chamber structure assembly is formed with the wall structures having a first chamber portion S1 \ S2 \ S3 '... into which the diluent is conducted from a dilution liquid channel and wherein said second chamber portion S1 ,,, S2, S3 ". is either a meandering chamber structure 5 terminating in the tubes of the bellows 11, or the second chamber portion being replaced by separate tubes terminating in the tubes of the bellows meandering tube line Dilution fluid flow Lj is led to the first chamber parts S1 ', S2, ... through the tubes 24a1,24a2 ... The mass flow comes from the manifold J1 The combined flow L1 + L2 is led to the second chamber portion S1 ", S2, S3" ... and further to the tubes 11 of the bellows.

Fig. 7A illustrates an embodiment of the invention in which a dilution fluid delivery tube 102 is disposed between the removable partitions 2 ^, 2 ^ ... with a separate agitator nozzle 100 disposed in front thereof. The agitator nozzle 100 is a positionable / replaceable plate , through which the combined flow Lj + L2 passes as shown in the figure, and which plate is intended for efficient mixing of the combined flow Lj + before the combined flow enters e.g.

Hai.i »llai.2 ··· • · •. Fig. 7B shows an embodiment of Fig. 7A in cross-section V-V of Fig. 7A.

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Fig. 7C illustrates various embodiments of the mixing plate 100 in Figures a, b and c, whereby the opening (s) 101 passing through the plate 100 may comprise a different shape of the flow cross-section. The number of flow openings 101 in the mixing plate 100 may vary 25. The agitator plate is easily positioned at the outlet side of the diluent inlet and is easily interchangeable to provide the desired flow L1 + agitation, i.e., a combination of a mass flow and a dilution flow.

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Claims (9)

An installation in connection with an inlet carriage in a paper machine / carton machine for joining a dilution stream (Li) with a pulp stream (L2) led by a distribution stock (J) in which the dilution stream (Li) is conducted through dilution flow channels (D 1, D 2 ...) to a separate mixing chamber (Si, S 2 ...), and that the mixing chamber (Si, S 2 ...) is limited by at least a separate mountable partition (21ai, 21a2 ...), characterized thereof, that the partition wall (21ai, 21a2 ...) is such that, when assembling the inlet drawer 10, it is mountable as a separate part between an upper panel (Fi) and a lower panel (F2) in connection with the inlet drawer and is attachable to said panels . Installation according to claim 1, characterized in that the partition wall comprises upper brackets (23a) and lower brackets (23b), with which the partition as a module-like separately mounted unit is connectable to the counter-brackets (22a) in the upper panel (Fi). ) in the inlet tray and into the counter brackets (22b) in the lower disc (F2) in the inlet tray. Installation according to claim 1 or 2, characterized in that the intermediate wall (21ai, 21a2 ...) is formed by casting or by something else I '. mass production process. . . System according to claim 1 or 2, characterized in that intermediate! the wall (21ai, 21a2 ...) is formed by machining a desired shape onto a * partition blank. Installation according to any of the preceding claims, characterized in that (23a, 23b) on the middle wall is formed by such structural forms as •. The tili mold fits in structural forms in the tiles connected to these discs (Fi, F2) and k, that said fastening means is advantageously formed by a locking / abutment joint. Plant according to any of the preceding claims, characterized. . thereof, comprising at least one curved surface shape which is mating and cooperating with a surface shape of an opposing partition in the mixing V chamber. 11 110528 Installation according to any of the preceding claims, characterized in that (21ai, 21a2 ...) are designed in such a way that a separate interchangeable throttle / mixing tray (100) comprising one or more flow openings (100) can be mounted between them. 101) to effect the mixing of the stream 5 (Li + L2) to be joined, whereby to achieve the desired mixing of the streams, a tray (100) of different heel quantity / heel shape can be selected in connection with the separate mountable partitions in the mixing chamber. Installation according to any of the preceding claims, characterized in that (21 a 1, 21 a 2 ...) are designed in such a way that a first mixing chamber (Si ', S 2', S 3 and thereto connects a second mixing chamber (Si "; S2", S3 "...), which later chamber (Si", S2 "...) connects to a winding vertical row (Ila2.i, lla2.2, lla2 .3 ...; lla3.i, lla3.2, lla3.3 ...) of a one-pipe system (11). Installation according to any one of the preceding claims, characterized in that a pipe (24ai, 24a2 ...) is provided in the mixing chamber between the separate adjustable partitions (21ai, 21a2 ...), whereby the flow resistance can be controlled by changing the shape and / or diameter thereof and / or a desired flow resistance can be achieved by regulating the shape / amount of the outlet opening (s) thereof. * t • * «* f t * · *» t * I t