EP2092117A1 - Sealing elements in a twin-wire paper machine - Google Patents
Sealing elements in a twin-wire paper machineInfo
- Publication number
- EP2092117A1 EP2092117A1 EP07808845A EP07808845A EP2092117A1 EP 2092117 A1 EP2092117 A1 EP 2092117A1 EP 07808845 A EP07808845 A EP 07808845A EP 07808845 A EP07808845 A EP 07808845A EP 2092117 A1 EP2092117 A1 EP 2092117A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wire
- dewatering
- twin
- sealing
- space
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/02—Head boxes of Fourdrinier machines
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F9/00—Complete machines for making continuous webs of paper
- D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
Landscapes
- Paper (AREA)
Abstract
The present invention relates to a twin-wire press (50) for dewatering of a fibre suspension, comprising an endless lower wire (1.0) and an endless upper wire (12), an upper wire guiding member (20), a lower wire guiding member (18), such that a tapering dewatering space (6) is formed between the upper and lower wire guiding members, and sealing members (54) extending from an inlet box (8). The sealing members (54) in the twin-wire press comprises an upper and lower substantially form-stable sealing element (54', 54''), respectively, that in the tapering space (21) between the upper and lower wire guiding members (18, 20) is sealingly arranged against the upper and lower wire (10, 12), respectively.
Description
SEALING ELEMENTS IN A TWIN-WIRE PAPER MACHINE
The present invention relates to a twin-wire press.
Twin-wire presses for dewatering of a fibre suspension and forming of a continuous web thereof are previously known. Dewatering of the pulp is usually done from an inlet pulp concentration of 3-8 percentages by weight to a outlet pulp concentration of 30-50 percentages by weight. According to the state of the art, such twin-wire presses comprises lower rolls, an endless lower wire running in a path around the lower rolls, upper rolls, and an endless upper wire running in a path around the upper rolls. The two wires co-operate with each other along dewatering sections of said paths, in which the wires forms a wedge- shaped dewatering space for the fibre suspension between each other. During displacement of the wires along said dewatering sections, the wires thus successively compresses the fibre suspension in the wedge-shaped dewatering space, whereby the fibre suspension is initially pressed and dewatered and formed to a continuous fibre web between the wires.
An inlet box provides for supply of fibre suspension to the wedge-shaped dewatering space between the wires. The known twin-wire press further comprises two dewatering tables supporting the respective wire in said dewatering sections of the path, such that the wedge-shaped dewatering space is formed between the wires, and a roll arrangement situated after the dewatering tables, as seen in the direction of movement of the wires, for finally pressing and dewatering of the fibre web between the wires, so that the fibre web will get a desired dryness. Alongside the longitudinal direction of the wires, in the
RECCHtD COPY - raANSLATION (Rule 12.4)
wedge-shaped dewatering space, there are perforated dewatering elements that are arranged against the wires outside the dewatering space. Formed filtrate flows through the wires and the perforated dewatering elements and is lead away to upper and lower outlet boxes, respectively, arranged at the dewatering tables. The upper and lower outlet box, respectively, may be divided into several chambers whereby a filtrate that flows through the upper and lower dewatering elements, respectively, may be divided into partial filtrate in two or more chambers in the respective outlet box.
A traditional twin-wire press comprises sealing members in the shape of an upper resilient sealing blade, that extends from the inlet box into the wedge-shaped dewatering space where it is sealingly arranged against the upper wire, and a lower resilient sealing blade, that extends from the inlet box into the wedge-shaped dewatering space where it is sealingly arranged against the lower wire. Between the upper and lower sealing blades is formed a passage for the fibre suspension between the inlet box and the wedge-shaped dewatering space. The ends of the sealing blades are usually located a short distance into the dewatering space. The sealing blades usually have a thickness of about 1.5-2 mm.
The geometry for the inlet box with adjusting sealing blades in the conventional twin-wire press, for supply of the fibre suspension to the wedge-shaped dewatering space between the wires, is very complicated to set in order to obtain correct and desired flow of suspension. Said geometry is tested thoroughly by many tests and trials during long time before the twin-wire press is put into operation. The geometry for the inlet box and the
distances between the sealing blades are thus fixed. An increase of the thickness of the sealing blades results in a decreased distance between the blades, which consequently is not desired. In addition, since the free ends of the sealing blades bear against the insides of the wires in the dewatering space, it results in a limited possibility to raise and lower the dewatering tables in order to change the geometry in the wedge-shaped dewatering space. Hence, the thickness of the sealing blades implies a limitation with respect to the possibility to be able to produce fibre webs in the twin- wire press having different graxnmage, in particular lower grammages.
It is necessary that the known sealing blades are resilient because they should seal and press sufficiently against the wire owing to the overpressure that is created by the passing fibre suspension. The sealing blades are extending along the whole width of the machine, which is usually four to five meters. It is also complicated and time-consuming to straighten the sealing blades in order to achieve a correct straightness such that they bear against the insides of the wires. In that respect, it is also difficult and time-consuming to change the sealing blades, which must be done during stoppage of production, which implies wasted production time and thus a cost.
In order to be able to manage the aggressive environment, the prior known sealing blades are made of acidproof steel. In spite of the fact that the sealing blades are made of steel, they are worn out relatively quickly, due to certain fillers that are present in the white water that is recirculated from the paper machine to the fibre raw material. It occurs inter alia from precipitations in
the form of carbides on the sealing blades of steel. An increase of the hardness of the sealing blades such that they exceed the hardness of the carbides, in order to decrease the wear on the sealing blades, means that the necessary resilient properties of the sealing blades are lost.
If the wear of the known sealing blades becomes too large, the wires may be damaged and in worst case break down. For this reason, the sealing blades must be changed in due time, before risk for damages on the wire may arise. As a consequence of wear of the sealing blades during operation in the twin-wire press, the actual life is relatively short. Obviously, from the description above, installation and change of the sealing blades are time-consuming and thus costly. Since the known sealing blades are made of steel, they are also very difficult to produce and hence expensive.
In twin-wire presses of the kind mentioned above, also wire guiding members occurs, that are arranged at the inlet section of the twin-wire press. They are made up of a respective bent sheet metal, against which the respective wire runs, and replaces those rolls that traditionally are used at an inlet section of a twin-wire press. Wear occurs also on the wire guiding members and there is a risk that the wires can be damaged during too large wear on the wire guiding members. The wire guiding members are in themselves expensive. Installation and exchange of the wire guiding members are also time- consuming and costly.
The present invention aims to at least partially eliminate those drawbacks that are associated with the state of the
art as mentioned above. A general object in accordance with the present invention is to achieve improved sealing members for a twin-wire press. In particular it is an object to achieve sealing members having longer lifetime and/or to achieve a simpler and faster exchange of sealing members in a twin-wire press. Yet an object is to be able to adjust the geometry of the wedge-shaped dewatering space between the dewatering tables to a larger extent. Yet an object is to reduce the wear of the sealing members. In addition, an object is to decrease the cost for exchange and production of the sealing members in a twin-wire press. In addition, an object is to also decrease the cost for exchange and production of the wire guiding members in a twin-wire press.
This object is achieved with a twin-wire press for dewatering of a fibre suspension, according to the present invention, which comprises an endless lower wire and an endless upper wire, that defines an oblong dewatering space, in which the fibre suspension will be dewatered during displacement of the wires. Further, the twin-wire press comprises an inlet box for supply of fibre suspension to the dewatering space, at an inlet end of the dewatering space, lower respectively upper perforated dewatering elements that are arranged against the wires outside the dewatering space, an upper outlet box for collection of filtrate that flows from the dewatering space through the upper wire and the upper perforated dewatering element, and a lower outlet box for collection of filtrate that flows from the dewatering space through the lower wire and the lower perforated dewatering element. An upper wire guiding member is arranged to guide the upper wire obliquely downwards towards the inlet end of the dewatering space, a lower wire guiding member
arranged to guide the lower wire obliquely upwards towards the inlet end of the dewatering space, such that a tapering space is formed between the upper and lower wire guiding members. Further, the twin-wire press comprises upper and lower sealing members extending from the inlet box, for sealing between the wires and the fibre suspension that enter into the dewatering space. The upper and lower sealing members delimit a passage between each other for the fibre suspension, that flows to the dewatering space from the inlet box. The sealing members comprises an upper wedge-shaped sealing element, that in the tapering space between the upper and lower wire guiding members is sealingly arranged against the upper wire, and a lower wedge-shaped sealing element, that in the tapering space between the upper and lower wire guiding members is sealingly arranged against the lower wire. Each sealing element presents a first side, that delimits part of said passage for the fibre suspension, and a second side, that extends with an acute angle towards the first side and that is arranged to at least in part be sealingly arranged against the associated wire. The twin-wire press is characterised in that the sealing elements are arranged with a substantially equal distance between the first sides of the respective sealing element, which forms the passage for the pulp suspension from the inlet box to the dewatering space, as a distance between the upper and lower wires at the inlet end of the dewatering space.
Exchange and assembly of the sealing elements in a twin- wire press are less complicated compared to the conventional sealing blades, which required accurate straightening. In accordance with the present invention, the cost for production of the sealing elements is
decreased, as well as installation and exchange in a twin- wire press, since the time for stoppage of production can be lowered considerably, in comparison with the traditionally used sealing blades. Besides may also the cost for exchange and production of the wire guiding members for use in a twin-wire press be decreased, if they according to an embodiment of the invention are formed as wearing parts, as evident in more detail here below.
When we in the following description mentions that a sealing element is arranged "sealingly against" a wire guiding member, we intend by the expression that a wire is arranged between the sealing element and the wire guiding member.
By the expressions "wedge-shape" and "wedge-shaped", concerning the design of the sealing element according to the present invention, it is intended that the sealing element have a tapering shape. This comprises also that the sealing element may have chamfered shapes. Thus, that the sealing element have a wedge-shape comprises a surface that is oblique in comparison to anther opposite or adjacent surface of the sealing element, as described in detail in the following description. However, the tapering form needs not to be continuously tapering.
The respective sealing element i arranged sealingly only against the respective wire guiding member according to an embodiment. Thus, the sealing members according to the present invention does not need to project into the dewatering space as in the case with the conventional sealing blades. In that respect, the same distance can be obtained between the upper and lower sealing members in the passage of the fibre suspension from the inlet box to
the dewatering space, as between the upper and lower wires in the very inlet end of the dewatering space. This results in an advantage with respect to capacity, in such a way that the dewatering can begin earlier in the dewatering space. The conventional sealing blades forms a doorstep in the dewatering space at the ends of the sealing blades, and the clearance of the space where the pulp suspension is conveyed in the dewatering space is increased with several millimetres at the ends of the sealing blades, which influences on the formation and dewatering. In accordance with the solution according to the present invention, a more even and gentle transition can be achieved, where the pulp suspension is passing by the ends of the sealing elements, which results in a better formation and dewatering of the pulp suspension. Besides, the grammage becomes lower, thanks to a thinner pulp thickness in this area between the dewatering tables at the inlet end of the dewatering space, which is very desirable when it comes to the properties of the twin-wire press.
The sealing elements may have a certain elasticity/flexibility, but return to its original shape when the load decreases. Thus, the deformation of the sealing elements does not become permanent. Owing to that, the respective sealing element can be designed as a wedge- shaped elastic body, the life time of the sealing elements can be extended and the wear may even be decreased. By a suitable material choice, a desired rigidity can be provided for the sealing elements according to the present invention. Consequently, the prior requirements with respect to alignment of the conventional thin sealing blades, according to the prior art, may be eliminated. In addition, this facilitates production in various
materials, even other materials than metal, for the sealing members. The sealing elements according to the present invention facilitate both a more cost-efficient production, assembly and exchange than the case of the traditionally used sealing blades.
Each sealing element has a wedge-shaped cross section. In that respect, each sealing element presents a first side, that delimits a part of said passage for the fibre suspension, and a second side that extends with an acute angle towards the first side and that is arranged to at least in part be sealingly arranged against the associated wire. The other design of the sealing elements may be varied for adaptation to various pulp environments and geometries of other twin-wire presses.
According to an embodiment of the present invention, it is possible to arrange the sealing elements such that its position towards the wire guiding members can be adjusted in the longitudinal direction of the twin-wire press.
According to yet an embodiment, the wire guiding members can be adjustably arranged in vertical direction towards the sealing elements. According to an embodiment, the wire guiding members can be integrated with the perforated dewatering elements that are arranged against the respective wire in the dewatering space. By the wedge- shape of the sealing elements, the distances of the dewatering space may in that respect vary by horizontal movement of the sealing elements according to an embodiment, in a direction towards and away from the wire guiding members, respectively, when they are integrated with the perforated dewatering elements. According to yet an embodiment, the wire guiding members can comprise perforated dewatering elements, at least in connection
towards the inlet end of the dewatering space, such that dewatering can be started immediately at entrance of the pulp suspension between the dewatering tables and immediately after that the pulp suspension has passed by the sealing members, that is at the position where the respective wire leaves the end of the sealing members at the abutment against the respective wire guiding member.
The wire guiding members, respectively, can be provided with a wear element on the surfaces against the respective wire. The wear element can be designed such that it is an exchangeable wear part on the wire guiding member. The wear element is suitably made of a polymer. In that respect may an increase of the lifetime for wire guiding members to a twin-wire press be achieved. The respective sealing elements associated with respective wire guiding member has suitably a shape that is at least partially form-fitted for each other, i.e. a respective geometric form that is adapted for each other, along a portion where they abut against each other.
The sealing elements may substantially be made of a polymer, such as e.g. polyethylene, which have proved to quite perfectly resist wear in various pulp environments and to a very large extent resist wear of carbides that are formed from fillers. In that respect, an increase of the lifetime of the sealing members for a twin-wire press can be provided.
The wire guiding members need not necessarily show any elasticity. The wear element of the wire guiding members may also be produced of a very hard material, such as e.g. a ceramic material. Thus, according to an embodiment of the present invention, form one starting point, the wire
guiding members can be said to control the shape of the sealing elements. The wire guiding members need not be elastic, but the sealing elements may suitably be elastic.
Besides, it is possible that the sealing elements and the wire guiding members can be designed of a core of metal having a surface treatment, such as an outer portion of a plastic material.
Additional preferred features, advantages and preferred embodiments according to the invention are evident from the dependent claims, and also from the following description of embodiments.
The present invention will now be described in more detail by embodiments, with reference to accompanying drawings, without restricted interpretation of the invention thereof, where
fig. 1 shows, schematically in a partial view, a longitudinal cross-section at an inlet section of conventional twin-wire press, fig. 2A shows, schematically in a partial view, a longitudinal cross-section at an inlet section of a twin- wire press according to an embodiment of the present invention, fig. 2B shows, schematically in a partial view, a longitudinal cross-section at an inlet section of a twin- wire press according to an embodiment of the present invention, and fig. 2C shows, schematically in an overview, a longitudinal cross-section through a twin-wire press, according to an embodiment of the present invention, which
can comprise any of the embodiments shown in figs. 2A and 2B.
To make it clear, a conventional twin-wire press is first described with reference to fig. 1, that schematically shows a part of an inlet section 3 of the conventional twin-wire press 2, to be precise a section at an inlet end 4 of a dewatering space 6 in the area at and around an inlet box 8. The fibre suspension that should be dewatered is supplied from the inlet box 8 to the dewatering space 6 delimited between an endless lower wire 10 and an endless upper wire 12 during displacement of the wires 10, 12. Perforated dewatering elements 14, 16 abut against the wires outside the dewatering space. Such perforated dewatering elements are used along the whole length Ll of the dewatering space for removal of filtrate from the dewatering space. The wire guiding members 18, 20 shown in fig. 1, that are arranged at the inlet section 3 of the twin-wire press, are made of a curved sheet metal, respectively, against which the respective wire runs, and replaces those rolls that conventionally are used at an inlet section of a twin-wire press. The wire guiding members 18, 20 have an oblique surface 18', 20', against which respective wire runs, that have a longitudinal extension L2 which forms an acute angle towards the longitudinal extension Ll of the dewatering space. Thus, an upper wire guiding member 20 is arranged to guide the upper wire obliquely downwards towards the inlet end of the dewatering space and a lower wire guiding member 18 is arranged to guide the lower wire obliquely upwards towards the inlet end of the dewatering space. In that way a tapering space 21 is formed between the upper and lower wire guiding members. Filtrate flows through the wires 10, 12 from the dewatering space and are colleted in outlet
boxes 22, 24. The lower outlet box 22, arranged in a lower dewatering table, collects filtrate that flows from the dewatering space through the lower wire 10 and lower dewatering elements, while the upper outlet box 24, arranged in an upper dewatering table, collects filtrate that flows from the dewatering space through the upper wire 12 and upper dewatering elements. Further, the conventional twin-wire press comprises perforated dewatering elements 14, 16 arranged in direct connection to sealing blades 26, 28 extending from the inlet box 8, whose free ends abut against a respective inside 30, 32 of the wires 10, 12 in the dewatering space.
In the following, the twin-wire press according to the present invention is described, with reference to the embodiments shown in figs. 2A-C. Corresponding conventional features and components are denoted with the same reference numerals for the embodiments according to the invention shown in figs. 2A-C as for the inlet section of the conventional twin-wire press shown in fig. 1.
Fig. 2A-B shows an inlet section 51 of an twin-wire press 50 according to the present invention, that like the twin- wire press 2 in fig. 1 shows a dewatering space 6, an inlet box 8, an endless lower wire 10, an endless upper wire 12, perforated dewatering elements 14, 16, wire guiding members 18, 20, a tapering space 21 and outlet boxes 22, 24. The dewatering space 6 has an inlet end 52.
As evident of the embodiments in figs. 2A and B according to the present invention, the twin-wire press 50 comprises sealing members 53, 54 in the shape of a respective sealing element 53', 53'', 54', 54'' arranged on each side at an inlet end 52 of the dewatering space 6 in direct
connection to the inlet box 8. The sealing elements 53', 53'', 54', 54'' extends along substantially the whole width of the twin-wire press (perpendicular the plane of the paper in figs. 2A and 2B). An upper sealing element 53'', 54'' abuts in the tapering space 21 between the upper and lower wire guiding members 18, 20 sealingly against the upper wire 12. A lower sealing element 53', 54' abuts in the tapering space between the upper and lower wire guiding members 18, 20 sealingly against the lower wire 10. The upper and lower sealing elements 53', 53'', 54', 54'' delimits between each other a passage 55 for the fibre suspension, that flows to the dewatering space 6 from the inlet box 8. In accordance with an embodiment of the present invention, the respective sealing element 53', 53'', 54', 54'' abuts substantially only sealingly against the respective wire guiding member 18, 20. In accordance with the previous conventional sealing blades, the abutment was also against the dewatering elements 14, 16 (see fig. 1).
The respective sealing element 53', 53'', 54', 54'' has a wedge-shaped cross-section, seen in the longitudinal direction Ll of the twin-wire press as is evident from figs. 2A and 2B, which shows a first side 56 that delimits a portion of said passage 55, and a second side 60 facing from and opposite the first side and said passage. Further, the respective sealing element shows a third side 61 that is arranged to the inlet box 8. The respective wire runs against the oblique surface 18' , 20' of the respective wire guiding members 18, 20. According to the present invention, a seal is achieved by means of the respective oblique surface on the second side 60 of the sealing elements 53, 54 against the respective oblique surface 18', 20' of the wire guiding members.
Consequently, with the invention, a gentle and even transition between the sealing surface and the dewatering space is achieved in the position where the respective wire 10, 12 leaves the end 58 of the sealing element.
According to the present invention, as evident from fig. 2A, the first side 56 and the second side 60 forms a tongue-shaped, tapering, sharp portion 57 where the sides are met at the respective free end 58 of the sealing element in abutment against respective inside of the wire. This is one example how the respective sealing element with associated respective wire guiding member suitably may have a design that is at least partially form-fitted after each other, i.e. a respective geometric shape that is adapted after each other, along an oblique portion where they abut against each other.
Returning to the common description of the two embodiments shown in figs. 2A and 2B, the sealing elements 53', 53'', 54', 54'' may comprise a recess 62 such as a groove or the like, that can be installed on a rail or a similar attachment device on the inlet box. The sealing elements can be arranged such that their position against the wire guiding members can be adjusted in horizontal direction in the longitudinal direction Ll of the twin-wire press, which is a preferred embodiment in particular for the sealing element 54 according to fig. 2B. The wire guiding members 18, 20 can be adjustably arranged in a vertical direction Vl against the sealing elements 53', 53'', 54', 54".
A substantially similar distance H2 between the first sides 56 of the respective the sealing elements 53, 54, that form the passage 55 for the pulp suspension from the
inlet box, is achieved in accordance with the present invention, like a distance Hl between the upper and lower wires 10, 12 at the very inlet end of the dewatering space 6. In accordance with the solution of the present invention, a more even and gentle transition can be provided, where the pulp suspension is passing by the end 58 of the sealing elements.
Said sealing elements 53', 53'', 54', 54'' are suitably made of a polymer, partially or completely. A polymer may for instance be polyethylene.
In the embodiments in figs. 2A-B, the wire guiding members 18, 20 are provided with a wear element 64, 66 in the form of an exchangeable wear part, on the oblique surfaces 18', 20' against each wire 10, 12. The wear element may e.g. be a ceramic material or a polymer. The wear element is e.g. polyethylene. The wear element may be designed as a separate exchangeable part that can be pushed on or off by means of a slot, alternatively a rail, on the body of the wire guiding member.
The wire guiding members 18, 20 and the sealing elements 53', 53'', 54', 54'', respectively, can also comprise a core of metal, surrounded by a wear element, e.g. a polymer.
According to an embodiment (not shown) the wire guiding members 18, 20 can be integrated with the perforated dewatering elements 14, 16, i.e. be arranged in connected in one piece, for abutment against the respective wire in the dewatering space. The distance Hl of the dewatering space may in that respect, according to an embodiment, be varied by horizontal movement of the sealing elements, in
the longitudinal direction Ll of the twin-wire press, in direction towards and from, respectively, the wire guiding members when they are integrated, i.e. be formed in one piece, with the perforated dewatering elements. The wire guiding members may at least partially comprise perforated dewatering elements (not shown) adjacent to the dewatering space such that dewatering immediately can be started already at the inlet end of the dewatering space, at the position where respective wire leaves the respective end 58 of the sealing elements.
Fig. 2C shows in a view an exemplifying performance of the whole twin-wire press 50 that may comprise the inlet section 51 shown in the embodiments according to figs. 2A and 2B according to the present invention. The twin-wire press 50 comprises three lower rolls, more specifically a drive roll 100, a guide roll 102 and a stretch roll 104. The above mentioned endless lower wire 10 runs in a path around the lower rolls 100, 102, 104. In corresponding way, the above mentioned upper endless upper wire 12 runs in a path around three upper rolls, specifically a drive roll 106, a guide roll 108 and a stretch roll 110. The above mentioned upper outlet box 24 in the upper dewatering table, that supports the upper wire 12, and the above mentioned lower outlet box 22 in the lower dewatering table, that supports the lower wire 10, forms the dewatering space 6 between the wires 10, 12. The twin- wire press shown in fig. 2C comprises the sealing members 53, 54, (not shown in fig. 2C) in accordance with the present invention, that has been described above with reference to fig. 2A and fig. 2B, respectively. The twin- wire press comprises an ordinary roll arrangement 112 according to the state of the art.
During operation of the twin-wire press according to figs. 2A-C, movement of the wires 10, 12 is carried out by rotation of the rolls 100-110. The fibre suspension, that will be dewatered, is fed to the oblong dewatering space 6 via the inlet box 8 at the inlet end 52 thereof. The fibre suspension is dewatered in the dewatering space 6 during movement of the wires, such that a filtrate flow is created from the dewatering space 6 through the wires 10, 12 and the perforated dewatering elements 14, 16. The filtrate that flows from the dewatering space through the wires is collected in the outlet boxes 22, 24.
Claims
1. Twin-wire press (50) for dewatering of a fibre suspension, comprising an endless lower wire (10) and an endless upper wire (12) , that defines an oblong dewatering space (β), in which the fibre suspension will be dewatered during displacement of the wires, an inlet box (8) for supply of the fibre suspension to the dewatering space at an inlet end (52) of the dewatering space, lower respectively upper perforated dewatering elements (14, 16) that are arranged against the wires outside the dewatering space, an upper outlet box (24) for collection of filtrate that flows from the dewatering space through the upper wire and the upper perforated dewatering element, and a lower outlet box (22) for collection of filtrate that flows from the dewatering space through the lower wire and the lower perforated dewatering element, an upper wire guiding member (20) that is arranged to guide the upper wire obliquely downwards towards the inlet end of the dewatering space, a lower wire guiding member (18) arranged to guide the lower wire obliquely upwards towards the inlet end of the dewatering space, such that a tapering space (21) is formed between the upper and lower wire guiding members, and upper and lower sealing members (53, 54) extending from the inlet box, for sealing between the wires and the fibre suspension that enter into the dewatering space, whereby the upper and lower sealing members (53, 54) delimit a passage (55) between each other for the fibre suspension, that flows to the dewatering space (6) from the inlet box (8), which sealing members (53, 54) comprises an upper wedge-shaped sealing element (53'', 54''), that in the tapering space (21) between the upper and lower wire guiding members (18, 20) is sealingly arranged against the upper wire (12), and a lower wedge- shaped sealing element (53', 54'), that in the tapering space between the upper and lower wire guiding members (18, 20) is sealingly arranged against the lower wire (10), whereby each sealing element (53, 54) presents a first side (56), that delimits part of said passage (55) for the fibre suspension, and a second side (60), that extends with an acute angle towards the first side (56) and that is arranged to at least in part be sealingly arranged against the associated wire, characterised in that the sealing elements (53', 54', 53", 54") are arranged with a substantially equal distance (H2) between the first sides (56) of the respective sealing element (53, 54) that forms the passage (55) for the pulp suspension from the inlet box to the dewatering space (6), as a distance (Hl) between the upper and lower wires (10, 12) at the inlet end of the dewatering space (6) .
2. Twin-wire press according to claim 1, characterized in that the respective sealing element (53', 53", 54', 54") only abuts sealingly against the respective wire guiding member (18, 20) .
3. Twin-wire press according to claim 1, characterized in that the first side (56) and the second side (60) of the respective sealing element (53' , 53' ' ) forms a tapering tongue-shaped portion (57) where the sides (56, 60) are met at the respective free end (58) of the respective sealing element (53', 53") in abutment against the respective inside of the wires (10, 12).
4. Twin-wire press according to any of the preceding claims, characterized in that the respective sealing element (53', 53", 54', 54") with associated respective wire guiding member (18, 20) have a design that is at least partially form-fitted after each other, along an oblique portion where they abut against each other.
5. Twin-wire press according to any of the preceding claims, characterized in that the sealing elements (53', 53'', 54', 54'') are substantially made of a polymer.
6. Twin-wire press according to any of the preceding claims, characterized in that the sealing elements (53' , 53'', 54', 54'') are adjustably arranged against the wire guiding members (18, 20) in a horizontal direction in the longitudinal direction (Ll) of the twin-wire press.
7. Twin-wire press according to any of the preceding claims, characterized in that the wire guiding members
(18, 20) are adjustably arranged in a vertical direction (Vl) against the sealing elements (53', 53", 54', 54").
8. Twin-wire press according to any of the preceding claims, characterized in that the wire guiding members
(18, 20) are provided with a wear element (64, 66) against each wire (10, 12) .
9. Twin-wire press according to any of the preceding claims, characterized in that the wire guiding members
(18, 20) are integrated with the perforated dewatering elements (14, 16) .
10. Twin-wire press according to any of the preceding claims, characterized in that the wire guiding members
(18, 20) comprise perforated dewatering elements.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE0602133A SE532154C2 (en) | 2006-10-06 | 2006-10-06 | Double wire press comprising sealing elements for dewatering a fiber suspension |
| PCT/SE2007/000845 WO2008041901A1 (en) | 2006-10-06 | 2007-09-26 | Sealing elements in a twin-wire paper machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2092117A1 true EP2092117A1 (en) | 2009-08-26 |
| EP2092117A4 EP2092117A4 (en) | 2012-05-30 |
Family
ID=39268683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP07808845A Withdrawn EP2092117A4 (en) | 2006-10-06 | 2007-09-26 | Sealing elements in a twin-wire paper machine |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20100043995A1 (en) |
| EP (1) | EP2092117A4 (en) |
| CN (1) | CN101522986B (en) |
| BR (1) | BRPI0717146A2 (en) |
| CA (1) | CA2664967A1 (en) |
| SE (1) | SE532154C2 (en) |
| WO (1) | WO2008041901A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9333468B2 (en) | 2012-09-24 | 2016-05-10 | Abengoa Bioenergy New Technologies, Llc | Soak vessels and methods for impregnating biomass with liquid |
| AT523438B1 (en) * | 2020-12-21 | 2021-08-15 | Andritz Ag Maschf | SEALING LIP AND METHOD FOR MONITORING THE SEALING LIP |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3440136A (en) * | 1965-12-16 | 1969-04-22 | Kimberly Clark Co | Papermaking apparatus including two wire sheet formers having means for air purging |
| US3582467A (en) * | 1968-06-25 | 1971-06-01 | Beloit Corp | Two wire former |
| GB1398950A (en) * | 1972-11-17 | 1975-06-25 | Andritz Ag Maschf | Liquid extraction machine having an imput system |
| US4544447A (en) * | 1983-02-09 | 1985-10-01 | Maschinenfabrik Andritz Actiengesellschaft | Dehydration machine for pulp, sludges or similar fibrous materials |
| EP0488058A1 (en) * | 1990-11-29 | 1992-06-03 | Valmet Paper Machinery Inc. | Forming-gap arrangement in a twin-wire former of a paper machine |
| US5160583A (en) * | 1991-12-02 | 1992-11-03 | Beloit Corporation | Controlled jet injection apparatus for a papermaking machine headbox |
| DE19919720A1 (en) * | 1999-04-30 | 2000-11-02 | Voith Sulzer Papiertech Patent | Fiber web formation zone has flexible blades at the stock inlet jet to guide the fiber suspension flow without turbulence between the fourdriniers at the support units which apply different pressures in zones |
| US20040163788A1 (en) * | 2003-02-20 | 2004-08-26 | Daniel Filion | Headbox sealing device |
| EP1813721A1 (en) * | 2006-01-27 | 2007-08-01 | Metso Paper, Inc. | Method and equipment for forming of a paper or board web |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3846232A (en) * | 1973-03-23 | 1974-11-05 | Valmet Oy | Twin-wire paper forming with wires wrapping around a suction web-forming breast roll and then following a curved path to a suction couch roll |
| US5254426A (en) * | 1992-04-01 | 1993-10-19 | Eastman Kodak Company | Method of making a projection viewable transparency |
| US5354426A (en) * | 1993-03-29 | 1994-10-11 | Boise Cascade Corporation | Apparatus and method for removing debris from forming wire |
| US5766419A (en) * | 1996-07-23 | 1998-06-16 | Valmet Corporation | Twin-wire gap former in a paper machine |
| US6117271A (en) * | 1998-04-15 | 2000-09-12 | Beloit Technologies, Inc. | Slice lip apparatus |
| JP4526389B2 (en) * | 2002-08-23 | 2010-08-18 | メッツォ ペーパー インコーポレイテッド | Formation of paper or paperboard web in twin wire former or twin wire section of former |
-
2006
- 2006-10-06 SE SE0602133A patent/SE532154C2/en unknown
-
2007
- 2007-09-26 CA CA002664967A patent/CA2664967A1/en not_active Abandoned
- 2007-09-26 WO PCT/SE2007/000845 patent/WO2008041901A1/en active Application Filing
- 2007-09-26 EP EP07808845A patent/EP2092117A4/en not_active Withdrawn
- 2007-09-26 US US12/444,191 patent/US20100043995A1/en not_active Abandoned
- 2007-09-26 BR BRPI0717146-3A patent/BRPI0717146A2/en not_active IP Right Cessation
- 2007-09-26 CN CN2007800374046A patent/CN101522986B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3440136A (en) * | 1965-12-16 | 1969-04-22 | Kimberly Clark Co | Papermaking apparatus including two wire sheet formers having means for air purging |
| US3582467A (en) * | 1968-06-25 | 1971-06-01 | Beloit Corp | Two wire former |
| GB1398950A (en) * | 1972-11-17 | 1975-06-25 | Andritz Ag Maschf | Liquid extraction machine having an imput system |
| US4544447A (en) * | 1983-02-09 | 1985-10-01 | Maschinenfabrik Andritz Actiengesellschaft | Dehydration machine for pulp, sludges or similar fibrous materials |
| EP0488058A1 (en) * | 1990-11-29 | 1992-06-03 | Valmet Paper Machinery Inc. | Forming-gap arrangement in a twin-wire former of a paper machine |
| US5160583A (en) * | 1991-12-02 | 1992-11-03 | Beloit Corporation | Controlled jet injection apparatus for a papermaking machine headbox |
| DE19919720A1 (en) * | 1999-04-30 | 2000-11-02 | Voith Sulzer Papiertech Patent | Fiber web formation zone has flexible blades at the stock inlet jet to guide the fiber suspension flow without turbulence between the fourdriniers at the support units which apply different pressures in zones |
| US20040163788A1 (en) * | 2003-02-20 | 2004-08-26 | Daniel Filion | Headbox sealing device |
| EP1813721A1 (en) * | 2006-01-27 | 2007-08-01 | Metso Paper, Inc. | Method and equipment for forming of a paper or board web |
Non-Patent Citations (2)
| Title |
|---|
| "Paper machine forming sections", , 8 February 2005 (2005-02-08), XP55020454, Retrieved from the Internet: URL:http://www.metso.com/MP/marketing/Vault2MP.nsf/BYWID2/WID-041013-2256E-4B51D/$File/Forming_sections_PBL.pdf?openElement [retrieved on 2012-02-28] * |
| See also references of WO2008041901A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2664967A1 (en) | 2008-04-10 |
| CN101522986B (en) | 2012-07-04 |
| WO2008041901A1 (en) | 2008-04-10 |
| BRPI0717146A2 (en) | 2013-11-12 |
| CN101522986A (en) | 2009-09-02 |
| EP2092117A4 (en) | 2012-05-30 |
| US20100043995A1 (en) | 2010-02-25 |
| SE532154C2 (en) | 2009-11-03 |
| SE0602133L (en) | 2008-04-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1543194B1 (en) | Forming of a paper or board web in a twin-wire former | |
| US5536372A (en) | Web former for a paper machine with spring blade loading device | |
| US5851356A (en) | Method and apparatus for the lateral sealing of a drainage wedge in a twin-wire paper machine | |
| EP0296135A2 (en) | Hydrid former for a paper machine | |
| WO1995008023A1 (en) | A multilayer headbox | |
| US8236139B1 (en) | Apparatus for improving basis weight uniformity with deckle wave control | |
| US7491295B2 (en) | Dewatering element having non-pulsing dewatering followed by pulsing dewatering | |
| KR100205103B1 (en) | Rib construction for a draining device in a paper machine | |
| WO2008041901A1 (en) | Sealing elements in a twin-wire paper machine | |
| EP0615565B1 (en) | Controlled jet injection apparatus for a papermaking machine headbox | |
| US5759353A (en) | Web former in a paper machine | |
| FI112097B (en) | forming device | |
| US6139687A (en) | Cross-machine direction stiffened dividers for a papermaking headbox | |
| EP0299765B1 (en) | Sealing apparatus for a filter press | |
| EP2356280B1 (en) | Twin fabric forming section with multiple drainage shoes | |
| WO1999060205A1 (en) | Twin-wire roll-gap former in a paper machine | |
| FI116300B (en) | Method for Thick Pulp Printing on a Paper or Board Machine and Similar Thickness Pulp for Paper or Board Machine | |
| AU2003299801B2 (en) | Gap type forming section for a two fabric paper making machine | |
| CA2325855A1 (en) | Apparatus for removing fluid from a fibrous web | |
| FI119943B (en) | For forming a paper or board machine | |
| AU656190B2 (en) | Method and apparatus for improved twin wire forming | |
| CN117604802A (en) | Inclined net shaper | |
| CN110552231A (en) | Paper machine and rubber roll | |
| CA2192832A1 (en) | Forming arrangement for the sheet-forming region of a paper or cardboard machine | |
| WO2008093000A1 (en) | Overpressure apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| PUAB | Information related to the publication of an a document modified or deleted |
Free format text: ORIGINAL CODE: 0009199EPPU |
|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 20090122 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR |
|
| DAX | Request for extension of the european patent (deleted) | ||
| A4 | Supplementary search report drawn up and despatched |
Effective date: 20120427 |
|
| RIC1 | Information provided on ipc code assigned before grant |
Ipc: D21F 1/00 20060101AFI20120423BHEP |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 20121127 |