FI115538B - Dewatering machine in a paper machine or similar - Google Patents

Description

115538

Dewatering machine in a paper machine or similar

Vattenavlägsningsanordning i en pappersmaskin eller motsvarande i? ! 5

The present invention relates to a dewatering device in a papermaking machine or the like, comprising a suction box comprising a tissue such as a wire guide, the pulp web being arranged to pass between the wires and a guide of the wire in the suction box the tissue guiding elements are adapted to be movable towards and away from the track with loading devices.

Formerers use suction boxes in connection therewith, whereby the pulp web so-15 is driven to pass over the suction area of the suction box between the wires. Various Kaare-I wool molded shoe shapes give the curve the desired curve, making | dewatering can be influenced not only by the tension of the tissue but also by medium hardening and suction. In prior art suction boxes, fixed foil moldings are used with a vacuum between the foils. Fixed foil strips wear out the wires due to 20 friction and therefore foil strips also wear out. Friction raises t i; * also the power needed to move the wires. Using a load / unloader / suction box combination increases wire wear and efficiency ':'; even bigger.

This application discloses a loop loop running from the pulp <i · ... to be used to enhance dewatering. In particular, it is intended to provide a »» '···' dewatering unit in the twin-wire region, whereby the dewatering pressure consists of the fabric tension and centrifugal force. The effect of the two forces described above will increase as machine speeds increase.

: 30-2115538

The application discloses for use in dewatering not only the vacuum in the suction box but also the adjustable curvature of the web. By adjusting the curvature of the web, it is possible to influence not only the tension of the fabric but also the centrifugal force on the web and thus the removal of water from the web.

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According to the invention, the dewatering is connected specifically to the suction box using a suction box which is fitted between the shoe shoes or the fabric guiding elements to act on the other side of the track with other guides loaded and displaceable according to the invention. The invention also uses control elements which are rollers or the like and are thus adapted to rotate and reduce friction. Thus, the wear of the wires is significantly reduced and the operating power required for the wires to be rotated is reduced. The rollers may preferably be hydrodynamically, electrically or magnetically mounted. According to the invention, the second loadable and position adjustable control elements are located between the first control elements. In this case, the length of the suction box can be controlled by dewatering by affecting the control elements and thus the path of the web, thereby obtaining a loop. The control elements provide a pulsating dewatering of the web, which is intensified. * Under vacuum of the suction box. The size of the vacuum can effectively influence the fines distribution of • 20 webs.

The dewatering device of the invention in a papermaking machine or the like is characterized in that the guide elements comprise rollers adapted to rotate which * * · 'are mounted to rotate in the roll cages, and the second fabric guide elements comprise rollers adapted to rotate. Other embodiments of the invention; the dependent features are set forth in the dependent claims.

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

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Fig. 1A illustrates a formwork according to the invention comprising a loaded second control element according to the invention for obtaining a loop-like loop at the suction box.

Figure IB illustrates loading devices of other tissue guiding elements, which in this embodiment consist of cylindrical devices. The form type is different from the embodiment of Figure IA. The pulp is fed to the wire H2, and only then is the pulp track W introduced into the gap between the wire Hi and H2.

Figure 1C shows area A2 of figure IB on an enlarged scale.

Figure 2 illustrates the meandering loop motion of the pulp web W provided by the device arrangement according to the invention. The representation is a magnification of A 1 in Figure IA.

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Figure 3 shows a preferred position of a dewatering device according to the invention in a third former type.

Fig. 4 shows a dewatering device according to the invention in a hybrid mold.

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Figure 1A shows an embodiment of the invention in former 100 where the former '··. comprising forming wires Hi and H2 and a dewatering device 10 according to the invention.

The mass is introduced by the arrow Fi as shown in the gap between the wires Hi and H2. The former 100 * ·· * in FIG. IA shown is the 25 wire loop formed by the upper forming wire Hi and the wire guide rollers Eei, Ee2, E3 and the dewatering roller E ». Similarly, the second forming wire H2 forms a wire loop and comprises a wire on the inside; * guide rollers D1, D2, D3 and D4 and outside of roller D5. Within the wire loop formed by the wire H2, there is a suction box 110. The dewatering device 10 comprises a suction box 11 inside the first wire of the wire Hi. The suction box 11 comprises vacuum-adjustable compartments S1, S2, S3 and S4 with> tissue between the compartments the control elements 12ai, 12a2, 12a3, 12a4 and 12as, i.e. the rotating bearings 4 115538, the rollers 12ai, 12a2 ... The rollers 12ai, 12a2 ... are bearing for rotation in the roller bodies 13aj, 13a2 ... and the bearing is preferably hydrodynamic. The apparatus comprises, within the wire loop of the second wire H2, second fabric guiding elements 14ai, 14a2, 14a3 and 14a4, which are loaded elements, and which comprise second response portions 5 which are rotatable and bearing rollers 15ai, 15a2, 15a3, 15a4. The rollers 15ai, 15a2 ... are grouped such that, for example, the rollers 15ai are half-spaced between the guide elements 12aj, 12a2. The roll 15a2 is half spaced between the guide elements 12a2 and 12a3, etc. By means of these second loading elements 14ai, 14a2 ..., the wires H1, H2 and the mas-10 transported between them are pressed towards the suction box 11, and thus curved and can be utilized in the dewatering of the pulp web by the centrifugal force prevailing on the pulp web during curved web runs.

Figure 1B shows a dewatering device according to the invention in connection with another type of former 15,200. Figure 1C shows an enlarged area A2 of Figure IB.

Figs. 1B and 1C show a dewatering device 14a, 14a2 ... of the second control elements 14a, 14a2 ..., where the pulp is guided over the forming wire H2 as shown by arrow F1, and the pulp W with the forming wire H2 into the gap 20 The guide rolls of the wire Hi are marked No, E2 and E3.

The suction box 11 is similar to that of the embodiment of Fig. 1A and the structure of the second tissue guiding elements 14ai, 14a2 ... according to the invention. On the basis of the defects IB and 1C of FIG. 1, the load guiding devices 16ai, 14a2 ... of the wires 14ai, 14a2 ... of the tissue 14a, 14a2 ... are described in more detail. , D3, D4 and D5, which are located on the guide rollers; Inside the wire loop of the forming wire H2, a second suction box 110 is also located inside the wire loop.; *.

1B, 1C illustrates an embodiment of the invention in which the second control elements I 14ai, 14a2, comprising the loading means 16ai, 16a2 ... The loading means 16ai, 5 115538 16a2 ..., in this embodiment, consist of a cylinder apparatus, each cylinder member comprising a cylinder member 17 and a cylinder 18 within it and a piston 19 therein. A cylinder 20 is associated with a cradle 20 in which, for example, a control element 15ai, such as a roller, is arranged to rotate. The bearing between the control element 15ai and the body 5 is hydrodynamic. A similar arrangement is at the second tissue control element 15a2. By using the loading devices 16ai, 16a2 ..., the fabric guiding elements 14ai, 14a2 ... can be loaded and moved towards and away from the path Hi, W, H2. Thus, using the loading devices 16ai, 16a2 ..., the pulp web W is desirably pressed per compartments Si and S2 in the suction box 11. Thus, the webs W of the web such as wires Hi and H2 are curved as desired and the drainage of the web Hi can be adjusted. W, H2 by influencing the curvature and tension of the wires Hi and H2.

The loading means 16ai, 16a2 ... when formed from the cylindrical means may be exemplarily pneumatically operated.

As shown in Figure 2, the point A in Figure IA is shown on an enlarged scale.

The mass track W and the wires Hi and H2 follow loops on their knees. Mass track W '. · Loops loops between Hi and H2 wires. This gives a mass. * 20 centrifuges W applied as desired centrifugal force and thus desired dewatering as well as desired Hi and H2 tension.

A paper machine or the like is also understood to be a board, tissue and pulp drying machine.

25 '. Figure 3 shows a solution according to the invention in former 300 where mass! sprayed with the arrow Fi as shown between the wires H1 and H2 in the area of the dewatering roll E4, followed by a curved rib shoe Pi. The curved molding shoe Pi removes water from the pulp web W and after the molding shoe Pi there is a dewatering according to the invention; 30 device 10 for increasing the dry solids content of the web.

6115538

Figure 4 illustrates one embodiment of the invention in hybridformer 400, wherein the dual wire region has a loading element suction box combination P2 for dewatering the pulp web and affecting web properties. Thereafter, a dewatering device 10 according to the invention is provided which raises the dry matter content of the pulp web W before transferring it to the press section.

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Claims (5)

A dewatering device (10) in a papermaking machine or the like, comprising a suction box (11) comprising a tissue (Hi, H2) such as wire guiding elements (12ai, 12a2, 12a3 ...), wherein the pulp web (W) is arranged. pass between the ground wires (Hi and H2) and along the guide elements (12ai, 12a2 · ..) in the wire (Hi) suction box (11), and the dewatering apparatus comprises a second fabric guide element (14ai, 14a2 · ..) ), which tissue guiding elements (14ai, 14a2 · ..) are arranged to be movable towards and away from the rail (Hi, W, H2) by means of loading devices (16ai, 16a2 ...), it is known that the guiding elements ( 12ai, 12a2 · ..) comprise rollers adapted to rotate, which are mounted for rotation in the roller cradles (13ai, 13a2 · ..) and the second fabric guiding elements (14ai, 14a2 · ..) comprise rollers (15aj, 15a2,15a3) arranged as second counterparts. ..). 15 Dewatering device according to claim 1, characterized in that the first fabric guiding elements (12ai, 12a2 · ..) are arranged inside the first wire loop formed by the forming wire (Hi) and that the second fabric guiding elements (14ai, 14a2 · ..) are arranged. in the former inside a second loop, · 20 warp (H2) wire loop. Dewatering device according to Claim 1 or 2, characterized in that the first tissue guiding elements (12ai, 12a2 · ..) are arranged in the suction box * · (11) at or near the ends of the walls defining the vacuum compartments (Si, S2, S3). ! ' Dewatering device according to one of the preceding claims, characterized in that the loading means (16ai, 16a2 · ..) adapted to move and load the second tissue guiding elements (14ai, 14a2 ...) comprise: 30 cylinder means, each cylinder device comprising: a cylindrical body (17) and a cylindrical shaft (18) and a piston (19) therein, and that the cylinder arm (18) is associated with a cradle (20) having a tissue guiding element (14aj, 14a2 ...) such as a roller (15ai). , 15a2 · ..) is located, being hydrodynamic between the bearing control element (14ai, 14a2 · ..) and the cradle (11a). Dewatering device according to one of the preceding claims, characterized in that the second guiding elements (14a1, 14a2 ...) are arranged to be located between the first tissue guiding elements (12ai, 12a2 ...). l »s>» 115538