FI110699B - Input box for paper machine or equivalent - Google Patents

Description

110699

Headbox of a paper machine or similar Inloppsläda för pappermaskin eller motsvarande 5

The invention relates to a headbox of a paper machine or the like.

For the time being, there is no other option in the papermaking process for removing small heavy particles than vortex cleaners, which so far operate at a low fiber consistency of about 1.0%.

In the manufacture of paper, making a web / base paper has also failed to find a solution for increasing the consistency in order to achieve sufficient strength and uniformity of the paper. To be competitive, it should be possible to simplify processes and increase consistency throughout the pulp and paper production process before the headbox. Nowadays, vortex cleaners / sand separators are placed in pulp production and in short circulation, which prevents the increase in consistency in pulp production and short circuiting to pumping consistency of e.g. 3-5%. The object of the invention is to alleviate this problem, that is, by combining the sand-20 removal and the dilution headbox, the sorting consistency of the short circulation pulp can be easily increased to 3-4% and the dilution to the forming consistency is made. : / · Just before the integrated vortex cleaning headbox according to the invention. In other words, vortex cleaning can be located between the dilution step of the dilution headbox and the actual headbox. This section has the lowest mass rotation • · ·: 25 prior to web formation, as the dilution headbox dilutes the mass by 7-20%. This allows headbox consistency to be maintained at the edge of the papermaking process, but can increase the short-cycle consistency to a higher sorting and pumping consistency, thereby achieving energy savings and process simplification. It is also possible to increase the web consistency by more than 1%. With this invention, the minimum consistency of the pulp + main stream of the papermaking line is: '.: In a vortex cleaning headbox.

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In the vortex cleaning headbox, the first step of the vortex cleaning head is placed in the headbox before the turbulence generator. As vortex cleaners, conventional devices modified to a higher pressure can be used. However, the lure-5 vamp option is to build swirl cleaners inside the headbox instead of the conventional manifold. In this case, the pipe diameters should be increased by about 20-50% so that the accept fitting fits inside the pipe.

A paper machine or the like is a paper, board and tissue machine 10 or a pulp drying machine.

The headbox of a paper machine or the like according to the invention is characterized by what is claimed.

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

Fig. 1A shows a vortex cleaning headbox of a papermaking machine or the like according to the invention and a short pulp cycle associated therewith.

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Figure 1B is a longitudinal cross-sectional view of a vortex cleaning headbox attached to the waste system of Figure 1A.

Figure 1C is a sectional view taken along the line I-I1B.

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Fig. 1D is a separate view showing the structure of a cleaning whip associated with a vortex cleaning headbox according to the invention.

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Figure 2A is a longitudinal cross-sectional view of a vortex cleaning headbox.

Figure 2B is a sectional view II-II of Figure 2A.

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Figure 2C shows a preferred embodiment of the cleaning whip associated with the vortex cleaning headbox of Figure 2A.

Fig. 3A illustrates an embodiment of the invention which is mainly related to the rigid system of Figs. 10A-1D, wherein the vortex purification headbox comprises a mass distribution log and a dilution water log. Fig. 3A is a longitudinal cross-sectional view of the vortex cleaning headbox and Fig. 3B shows the structure of a cleaning whip associated with the headbox of Fig. 3A.

Figure 4 illustrates an embodiment of the invention in which the dilution flow and the viscous mass flow are combined before being introduced into the purification whip.

Fig. 1A shows a headbox 10 of a papermaking machine according to the invention, which in connection with the first swirl purifier 11 ', 11 az ... of the first vortex purifier y' 20 of the vortex purification plant 11 can be talked about in the invention. is called the vortex • • «« «coke. Figure 1A shows a short cycle 12 associated with the headbox 10 of the invention. From the headbox 10, pulp is led through the sweep purge plant 11 • · .... to the first stage Pui purge 11a, \ a2, intermediate chamber 30 and turbidity generator 31 to the lip cone 32 and further to the forming wire Hi.

. ·. : From the spare part 13, the tap water is led to the dilution circuit 14, where pump P1 further passes the dilution fluid filter 1 and 1 through the diluent screen 15 and together 16. to the liquid manifold J2. The dilution manifold J2 has a return connection 28 for circulating water.

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Valve V2 regulates the circulation water flow. Compound 28 joins to compound 27, which is a conductor. 30 from reject manifold support J3. From the screen 15, the reject is further connected through the screen 17 to the screen sorting 18 to the connection 25 and further through the second screen 19 and the acceptor connection to the second stage Puli of the vortex cleaning plant 11 to the acceptor connection 21, leading to the which recirculates the pulp through the screen 23 to the connection 24 and the mass to the log Ji, which has a return circuit 1 through 26 to the connection 22 and the suction side of the pump P2. From the headbox 10, the reject is further led to the second stage of the vortex cleaning plant 11 via the Puli inlet 27 and the inlet 27 via the valve Vj to control the flow. The second stage accept is further directed to the junction 21 and further back to the mass junction 22 after the thick pulp container 29. The reject from the 2nd stage Puli is further led, for example, to sorting. The reject of the screen 23 in the connection 22 is led to the connection 10 25 which is connected to the screen 19.

Figure 1B is a longitudinal sectional view of the vortex cleaning headbox 10 associated with the embodiment of Figure 1A according to the invention, comprising in its connection a dilution manifold J2. The solution shown in Fig. IB according to the invention comprises a mass distribution log Ji, from which the mass is directed (arrow Li) to a vortex purifier of the vortex purifier 10, i.e. a vortex purifier. further directed to the intermediate chamber 30 and further to the turbulence generator 31 and further to the turbulence generator 31 to the lip 20 and further to the forming wire Hi. Of the vortex purification lattice 11 ai, lla2 ..

«· * ··· / reject is further led to reject manifold J3 and from there to a vortex purifier * · '·· *. 11 After sorting by Puli to Stage 2 and further down to Stage 2, I turn to * * *.

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Figure 1C shows the structure of the purifier lla, 11a2 ... in section I-I

: from figure IB. As shown in the figure, the dilution water L2 is led through the manifold J2 and • * * • *, ···. correspondingly, the mass flow Li is passed through the mass distribution support J). Manifolds Ji

III

, *. and J2 derived currents are branched to branch channels a1, a2, a3 ... (arrow Li) and no, e2, • · *! .e3 „. (arrow L2) the mass flow through the a] channel and the non-channel and the dewatering water are supplied to the overlapping cleaning whiskers, respectively, the flows through the channels e2 and a2 i * · j are led to the overlapping cleaner whites llai, 11a2 and lla3 • · * 110699 and so on. . The dilution jock log J2 narrows at its end towards the same as the mass j j log jj. Thus, a uniform mass flow from the manifolds J 1 and J 2 to each channel a 1, a 2, a 3 ·; no, e2, e3 ... and so on.

Fig. 1D shows a separate view of the structure of the whisk 11a of the vortex cleaning device 11. In the structure of Fig. ID, a thick mass is led through the purge whip 1 through the inlet end Ci to the purge whip 1 into the tube 33. The reflex is led out from the other end C2 of the cleaning whip 1. The aseptic is guided through the central flow path f) of purification whip 11 ai from the end Ci of purge 1 to the intermediate chamber 30 and forward to headbox 10. According to the invention, one dilution water channel C1, C2 ... is tangentially connected to each purge 1 respectively 180 ° with respect to the above tangential input, the angular distribution channels of the viscous mass A1, a2 ... are tangentially connected to the corresponding purifier whip 1 la, 1 la2 ... in the embodiment of Fig. ID both dilution water (arrow L2) and mass (arrow Li) leading to the end Ci of the purification whip 11 ai.

As shown in Fig. 2A, a mass is led from the manifold L to each of the cleaning lids 1a, 11a2, 11a3 ... Fig. 2B shows a section ΙΙ-Π of Fig. 2A. As shown in Figs. 20A and 2B, the pulp is led from its manifold support to the channels ai, a2 ... and from the channel «· · ai to the overlapping cleaning pills 11ai, lla2, lla3 located at a given width of the headbox« 1 * · 1. The purifier whips 11a4, 11a5, 11a6 are located at the following width, and mass is introduced through the channel a2 from the manifold J1 which tumbles towards its end so that the mass flow to the cleaning whorls is uniform.

Acceptance from the purifier whip is conducted as in the previous embodiment to the intermediate chamber 30 and further to the turbulence generator 31 and further to the lip cone 32 '1 ·. 1 1 1 · and for forming wire Hi.

Fig. 2C shows a wide embodiment of the purifier whip 1. The mass is led from the manifolds 1 1, 1, 30 to the inlet end C 1 of the purifier whip 11 ai between the outer tube 33 and the inner sleeve 34 of the purge tube 11 ai, and through the internal channel f1 of the inner sleeve 34 to the intermediate chamber 30. The reflux is passed through the purge 6 110699 and the accept is further conveyed to the intermediate chamber 30. The reflux is led through the second end Ci of the purge whisk further away from the structure to the reject manifold and further to the vortex purifier Puli of Stage 2 or similar. In the structure of the invention, each purifier whip 11a 1, 5 11a 2 · ... outer tube 33 preferably has a conical shape, whereby the mass flow Li is tangentially conducted inside the outer tube 33 of the cleaning whipper in a helical progressive motion, such that the coarse particles are guided from the peripheral ends of the outer tube of the purifier whip C2 to the reject manifold and the finer material is introduced through the central inlet sleeve 34 as a passageway to the intermediate chamber 30 and forward in the headbox.

Figure 3A and 3B show another alternative for treating pulp L1 and dilution water L2. The purifier whip 11 ai further comprises an outer tube 33 and an inner sleeve 34 and the mass and dilution water are introduced into the purge whip 11 ai at an end C2 opposite to the inner sleeve 34 of the purging whip 34 at which end the inner sleeve 34 is located. The aseptic is further passed through the central path of the inner liner 34 from the end Ci of the purge whip 11 ai to the intermediate chamber 30 and the reject from the same end Ci of the outer sleeve 33 of the inner sleeve 34 and 20 away from the connection of the purifier whip 11i.

»· · ·· 'Both the dilution water and the pulp are led tangentially to the purifier whip 11 ai with respect to the outer tube 33 of the purifier whip 11 ai and at an angle of 180 ° to each other.

. In one embodiment of the invention, the pulp components to be dispensed are cleaned at a 3-4% consistency and dosed for headbox vortex cleaning, the accept of which is passed through the lip of the headbox. This is not necessary,. : machine strainer before dilution.

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Figure 4 shows an embodiment of the invention which otherwise corresponds to Figure 3B

• t · 30 embodiments, but wherein the thick mass flow rate L1 and the dilution flow rate L2 from the • 1 '·' tea ti are combined before being introduced into the purification whip 11 ai. Thus, for all 1 · 7 110699 cleaning whiskers Hai, IIa2 .. in this embodiment of the invention, the dilution water (flow L2) and the thick mass (flow L1) are combined and the combined flow L1 + L2 is led to the cleaning whipper L1a, IIa2 ... L2, as in previous embodiments, is subjected to helical movement, whereby the heavier particles 5 are separated by the centrifugal force from the side of the cleaning whip 11a, 11a2 .. and through the central channel fj, the accept is forwarded in the headboard.

Within the scope of the invention there is a possible embodiment in which at least two of the separate vortex cleaning whiskers from each of the respective whirlpool cleaning whiskers are accepted for flow. Thus, at least two preferably multiple rows of flow paths and hence headbox are drawn from each purge whip, for example directly into different rows of turbulence generator tubes and / or different rows of the same row and / or different rows across and across.

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Claims (8)

110 oS 9 A headbox (10) for a papermaking machine or the like, characterized in that it comprises, in connection with it, purifier whips (11a1a, 11a2 ...) for sorting the pulp into accep and reject whereby the accept is forwarded to the headbox and further to the forming wire (Hi). Headbox according to Claim 1, characterized in that the headbox (10) comprises cleaning whistles (11a, 11a2 ...) of the first stage (Pui) of the vortex cleaning plant (11). Headbox according to the preceding claim, characterized in that the cleaning whips (11a1, 11a2 ...) are superimposed and adjacent to the headbox of the papermaking machine so that at least a mass flow (Li) from the mass distribution logs (Jt) is introduced into each cleaning whip. centrally out of each purifier leg preferably to the headbox intermediate chamber (30) and further to the turbulence generator (31) and further to the lip cone (32) and further to the wire (Hi). Headbox according to any one of the preceding claims, characterized in that each cleaning whipper (11 ai, 11a2 ...) comprises a flow path (ai, «· · · a2 ...) for the pulp, and preferably also the dilution water flow path «· i (no, e2 ...) from the dilution water manifold (J2) and that the cleaning whip (11 ai, lla2 ...). comprising an inner inner sleeve (34) inside the outer tube (33) and the reject conducting. 25 is expelled from the end of the outer tube (33) and the accept through the central currents (fj) of the inner sleeve (34) in the headbox. · · • ·. ·· 1. Headbox according to the preceding claim, characterized in that water is supplied to the inlet end (Cj) of each purifier whip (11 ai) lying about the inner sleeve (34) and the reject is conducted from the opposite end (C2) of the purge whip to the abovementioned end (Ci) >> ject manifold (J3) and further down to the 2nd stage (Puli) of the vortex purification plant (11). Headbox according to any one of the preceding claims, characterized in that the dilution water manifold (J2) comprises, in its connection, control valves (V3) for controlling the dilution flow to each purge (Hai, IIa2 ...). Headbox according to one of the preceding claims, characterized in that each cleaning whipper (11a1a, 11a2 ...) comprises an outer tube (33) which comprises at least a portion of the distance to provide a helical flow of a conical portion for the cleaning whipper (11a1a, 11a2 ...). inside the outer tube (33). Headbox according to Claim 1, characterized in that the dilution flow rate (L2) and the mass flow rate (L1) are combined before being introduced into the purification whip (IIIa, IIa2 ...). * 1 · t · • · 1 • • • • • • • • • • • • 1 1 * * 1 1 • · * 1 · »· · · · · · ·