FI100895B - Installation in conjunction with the head box in a paper machine/cardboard machine to combine the diluent stream with the pulp stream from the head box - Google Patents

Abstract

The invention concerns an arrangement in conjunction with the head box in a paper machine/cardboard machine to mix a dilution stream L1 with the pulp stream L2 coming from the distribution stock J2 to control the basis weight of the web. The arrangement includes valves V1, V2, over the width of the head box by means of which the stream L1 of dilution liquid for pulp stream L2 coming from distribution stock J2 is controlled, in which during control of the dilution stream either throttling of the dilution stream increases or diminishes. The arrangement for introduction of the dilution liquid includes a distribution stock J2 that includes a chamber D' for dilution liquid whose bottom has openings 12a1, 12a2, over the machine width to which a spindle 13a1, 13a2, is adapted in a valve V1, V2, By changing the position of spindle 13a1, 13a2 the stream of dilution liquid from space D' is controlled. The dilution liquid is fed to a tube 11a1, 11a2, in a distribution pipe arrangement consisting of pipes in a row. In the arrangement the combined streams L1 + L2 of dilution liquid and pulp are fed into pipe 11a1, 11a2 . and into a narrowing channel 14; 14a1, 14a2, from which the stream L1 + L2 is evenly divided at each point along the width into a perpendicular pipe row 15a1.1, 15a1.2; 15a2.1, 15a2.2, in a pipe arrangement 15 advantageously to each perpendicular pipe in this pipe arrangement. <IMAGE>

Description

100895

Apparatus in connection with the headbox of a paper machine / board machine for combining the dilution flow with the mass flow from the manifold Anläggningen i sammanhanget av inloppslädan i pappersmaskinen / kartonmaskinen för att samansätta diluentströmningen med masströmningen ftän inloppslädan 5

The invention relates to an apparatus for connecting a dilution flow to a pulp flow derived from a manifold in connection with a paper machine / board machine headbox.

It is known from the applicant's previous patent applications, for example FT 933028, to combine the dilution flow with a pulp flow by introducing the dilution flow from its own manifold through a valve and directing it into a paper pulp / pulp flow derived from the pulp manifold. In the known solutions, the combined flow is further led through the piping of the paper machine / board machine to the intermediate chamber 15 and from the intermediate chamber to the turbulence generator via the turbulence tubes to the lip cone and further to the forming wire. By bringing the headbox width to the desired locations, the cross-sectional basis weight profile of the web can be adjusted as desired. In known solutions, the diluent is preferably fibrous water, the water content of which is substantially lower than the fiber content of the pulp. Thus, the diluent may be pure water or, for example, retention taken from a wire. wire water.

This application discloses a new type of simplified headbox model for diluent import arrangements.

25

In the solution according to the invention, the dilution flow Lj is led through an opening in the bottom of the dilution liquid chamber to the flow channel of the single-row manifold of the pulp flow L2 derived from the pulp manifold below. The dilution flow and the mass flow are combined in said flow line of the single-row manifold, and the combined flow is directed forward so that it enters a tapered channel, from the side surface of which the pipes of the piping row open. After the dilution flow and the mass flow mixing point, the flow resistance is the channel taper as shown in the figure. This item 2 100895 enhances the mixing of flows. Another point of intensification of mixing is in the tapered channel into which the combined flow enters and from which it is evenly distributed in the tubes of the instrumentation.

The structure according to the invention has a piping to which the dilution flow from the dilution water headbox is led by a single-row piping. This has the advantage that the flow channels can be larger in cross-section, thus minimizing the risk of clogging.

In one embodiment of the invention, separate tapered channels are thus connected to the vertical rows of the pipes of the grid, and thus the flow Lj + can be evenly distributed to all the pipes of the vertical row of the grid. Through the piping, the flow enters the intermediate chamber and further to the turbulence generator. The combined flow Lj + through the tubes of the turbulence generator is conducted to the lip cone and further to the forming wire.

15

Diluent manifold immediately above the pulp manifold so that the manifolds have a common bulkhead. According to the invention, a plurality of valves are used across the width of the headbox, which valves preferably comprise a mandrel fitted through an opening in the bottom of the diluent manifold. By moving the mandrel, the dilution flow orifice is opened and closed; increase or decrease the dilution flow restrictor. Preferably, the mandrel is such that it comprises a flow passage, the inlet position of which can be adjusted relative to the opening at the bottom of the dilution liquid chamber, whereby the throttling fluid constriction can be increased or decreased. Valve grooving is very simple and thus inexpensive.

25. The apparatus according to the invention in connection with the headbox of a paper machine / board machine is characterized by what is stated in the claims.

The invention will now be described with reference to the figures of the accompanying drawings, to which, however, the invention is not intended to be exclusively limited.

3 100895

Figure 1 shows a headbox of a paper machine in a longitudinal cross-sectional view.

Figure 2 shows on an enlarged scale the channel associated with the spindle and the operation of the spindle in dilution flow control.

5

Figure 3 shows another preferred embodiment in which a flow groove is made in the surface of the mandrel.

Figure 4 shows a section I-I of Figure 1.

10

Figure 3 shows a section II-II from Figure 1.

Figure 6 illustrates a partitioned tapered channel 14aj before the scythe.

Fig. 7 illustrates a device solution in which, before the whistle, there is a uniform chamber 14 extending over the width of the machine towards its end.

Figure 1 illustrates an import arrangement of a diluent according to the invention, preferably a dilution water, in connection with the headbox 10 of a paper machine / board machine 20 for adjusting the basis weight of the web from the web width. The headbox 10 comprises, as shown in the figure, the valves Vj, λ ^ ... of the dilution water manifold Jj, which divide the flow of dilution water «from the manifold Jj from its chamber space D 'to the pipes 11a, 11a2 · connected to the pulp manifold J2. so that said partitions comprise a common partition 100 associated with the so-called

25 front frame Rj. A single-row manifold is formed in the front frame R j from the width of the machine. ton pipes, i.e. channels Ι ^, Ι ^ ... Spindle 13aj, 13a2 · .., to which is connected an actuator moving it in the direction Sj «* passes through the chamber space D 'in question.

By means of the valves Vj, V2 · .. at different width points of the headbox 10, the dilution flow Lj-30 from the chamber Jj is controlled. The adjustment is effected by adjusting the position of the spindle 13a ^, 13a2 ··· in the openings 12aj, 12a2 · .. of the chamber space D '. The combined flow Lj + Ixj of the mass L2 from the manifold J2 and the dilution liquid Lj derived from the manifold Jj is further flowed in a single-row manifold. through the tubes 1 species, 1 ... to a narrowing channel 14 extending over the end of the machine width, which further opens into the grate 15 into its tubes 15, j, 15a ^ 2 -> l ^ a2 l> ^ a2 2 "^ the channel 14 narrows as described above The purpose of this is that the mass flowing out of the channel 14 is evenly distributed in all the pipes in the vertical row at said point of the grate 15. The combined flow Lj + L2 from the grate 15 is passed to the intermediate chamber 16 and from the intermediate chamber 16 to the turbulence generator 17. for the wire H. The lip cone 18 preferably comprises lamellae 19aj, 19a2,19a3 between horizontal rows of tubes 10 in different vertical positions 10 Preferably, three lamellae are used as shown in the figure; lamellae 19a ^, 19a2,19a3. The intermediate chamber 16 opens into the equalization chamber E from its upper part.

Figure 2 shows on an enlarged scale a preferred embodiment of the valve stem 13aj. The mandrel 13a 2 comprises a flow channel 21 comprising an inlet Αγ on the side surface of the mandrel 15 and an outlet A2 at the end of the mandrel. The flow channel 21 comprises a curved bend T. The dilution flow is conducted smoothly from the chamber space D 'through the channel 21 passing through the mandrel 13aj to the pipe 11a. The adjustment of the position of the spindle 13a is indicated by the arrow Sj. When raising and lowering the spindle, the inlet coverage is adjusted and thus either the throttling of the flow Lj is increased or decreased.

20

Fig. 3 shows another embodiment of a channel made in the mandrel, in which the channel 210 is formed on the side surface of the mandrel 13aj and is adapted to expand towards its end. The operation is similar to that of the previous embodiment.

Fig. 4 shows a section II from Fig. 1. The valves Vj are adapted to the width of the headbox at different width positions, and the actuator moving the mandrel • 13aj, 13a2 · .. is connected to the spindle 13a j, 13a2 · .. of each valve Vj, V2 ... for example, an electric motor or hydraulic cylinder actuator Gj ^ ·. · Fig. 5 shows a section II-II of Fig. 1.

♦ 1 5 100895

Fig. 6 illustrates a separate compartmentalized tapered channel 14aj associated with the channel 11a, through which a uniformly connected flow Lj + L · * is distributed to all the tubes 15aj j, 15aj 2 »^ aj in the vertical row at said point 15 of the grid 15. In the embodiment, the adjacent channels 14aj, 14a2 · .. comprise 5 side walls f for partitioning. In the embodiment of Fig. 6, each channel 11a1, 11a2 · .. is associated with a tapered channel 14a1, 14a2-. , wherein the purpose of the tapered channel, as in the unitary tapered chamber shown in the embodiment of Figures 1 and 7, is to distribute the mass flowing out of the channel 14a1, 14a2 evenly into all the pipes in the vertical row at said point of the grate 15.

10

Figure 7 is an axonometric illustration of the structure of Figure 1. The apparatus comprises a dilution water manifold Jj extending over the headbox width, which is a chamber-like structural component through which the control means V1, V2 · .. of the control valves Vj, V2 · .. of the dilution liquid Lj are passed through the internal chamber space D '.

As shown in Fig. 7, the chamber D 'of the dilution water manifold Jj comprises in its bottom and in the machine width openings 12aj, 12a2,12a3 ... into which the flow control valve Vj, V2 · .. stem 13aj, 13a2,13a3 ... is arranged so as to be able to increase or decrease the throttling of the 20 dilution flow Lj.

As shown in Fig. 7, a mass flow L2 is derived from the pulp distribution support J2 so as to combine with the dilution flow L1 derived from the dilution water distribution support Jj. The flows L1 and L2 are combined in the pipes 11a1, 11a2 derived from the manifold J2. .. 2 - ^ 532.1,1532 2 ··· The flow Li + L2 is distributed from the respective pipe 1 wide, 1 la2 · .. to the pipes of the pipe row at said machine width point 15 of the pipe system. Thus, in the structure according to the invention, the combined flow Li + L2 can be further distributed 30 evenly in the grate 15 and further through it in the headbox structure. As shown in Fig. 7, the headbox comprises, after the truss 15, an intermediate chamber 16 and 6 100895, after the intermediate chamber 16, a turbulence generator 17 and further, after the turbulence generator 17, a lip channel 18, from which the mass is passed on to the forming wire H.

Claims (5)

Device in connection with an outlet carriage in a paper machine / cardboard machine for mixing a dilution flow (L1) to the mass flow (1) coming from the distribution stock (J2) to control the path weight of the web, which comprises the width of the outlet carriage existing. (Vj, V2 ...), by means of which the flow (Lj) of the diluent to the mass flow (L2) coming from the distribution stock (J2) is regulated, whereby the dilution flow control is either increased or decreased on the dilution flow, whereby the diluent fluid insertion arrangement 10 comprises a distributor stock (J2) which comprises a diluent liquid chamber (D '), the bottom of which comprises the machine width openings (128 ^ 1232 -...). to which a spindle (ISaj, 13a2--) in a valve (Vj.V ^ ...) is adapted, and that by changing the position of the spindle (13a ^, 13a2>) the flow of the diluent from the space (D ') is controlled , characterized in that the diluent liquid is led to a tube (IIa / II ...) in a distribution tube arrangement consisting of tubes in a row and that in the arrangement the combined flow (Lj + Ly) of the diluent liquid and the mass is passed on into the tube ( llaj, lla2 · ..) and in a narrow channel (14; 14aj, 14a2 · ..), from which the flow (Lj + Ly) is evenly distributed at each point along the width to a vertical tube row (15aj j, 15aj y ... a pipe arrangement (15), advantageously for each vertical tube in this pipe arrangement. Device according to the preceding claim, characterized in that the spindle (13aj, 13a2 ·) comprises at its end a channel (21), one end (A2) of which opens from the end of the spindle (13aj, 13a2). ) opens from the lateral surface of the spindle, by controlling the position of the inlet orifice by moving the spin; the portion increases or decreases the restriction of the diluent liquid. Device according to any of the preceding claims, characterized in that the spindle comprises on its surface a latch (210), advantageously a latch which extends towards the end of the spindle (13a, 13a2 · ..), which acts as a flow channel for the dilution liquid in the spindle. (13aj, 13a2- ..). 100895 Device according to claim 1, characterized in that the tubes (1 laj, 1 la2 - ·) open in such a narrow channel (14) extending over the entire width of the outlet carriage. 5. Device according to claim 1, characterized in that the tubes (1 laj, 1 la2 -> which adhere to the distribution stock of the pulp each individually comprise a narrow channel towards their end (14aj, 14a2 · ..) ·