CN114555882B - Sheet for a headbox and method for producing a sheet - Google Patents
Sheet for a headbox and method for producing a sheet Download PDFInfo
- Publication number
- CN114555882B CN114555882B CN202080070207.XA CN202080070207A CN114555882B CN 114555882 B CN114555882 B CN 114555882B CN 202080070207 A CN202080070207 A CN 202080070207A CN 114555882 B CN114555882 B CN 114555882B
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- sheet
- downstream end
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- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 239000012530 fluid Substances 0.000 claims abstract description 69
- 239000000725 suspension Substances 0.000 claims abstract description 21
- 239000012528 membrane Substances 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 20
- 239000002184 metal Substances 0.000 claims description 17
- 241000446313 Lamella Species 0.000 claims description 16
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 10
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 10
- 239000004698 Polyethylene Substances 0.000 claims description 8
- 239000004417 polycarbonate Substances 0.000 claims description 8
- -1 polyethylene terephthalate Polymers 0.000 claims description 8
- 239000004033 plastic Substances 0.000 claims description 7
- 229920003023 plastic Polymers 0.000 claims description 7
- 229920000491 Polyphenylsulfone Polymers 0.000 claims description 6
- 229920000515 polycarbonate Polymers 0.000 claims description 4
- 229920000573 polyethylene Polymers 0.000 claims description 4
- 239000004918 carbon fiber reinforced polymer Substances 0.000 claims description 2
- 238000007669 thermal treatment Methods 0.000 claims description 2
- 239000000835 fiber Substances 0.000 description 12
- 239000010410 layer Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 239000002356 single layer Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 3
- 230000001154 acute effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
- D21F1/028—Details of the nozzle section
Landscapes
- Paper (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to a sheet (1) suitable for being inserted into a nozzle (17) of a headbox (16) of a paper machine, for separating two suspension flows flowing through the nozzle (17), comprising a sheet body (3) having a sheet body width, a sheet body length (4) and a sheet body thickness (5) and having a downstream end (8), the sheet body length (4) and the sheet body width defining a first fluid surface (6) and a second fluid surface (7) opposite the first fluid surface (6), and a membrane (13) protruding from the downstream end (8) of the sheet body (3) being fixed to the first fluid surface (6) or to the second fluid surface (7) at the downstream end (8). The sheet (1) according to the invention is characterized in that the film (13) protrudes beyond the downstream end (8) of the sheet body (3) by a protrusion (14), and in that the protrusion (14) is greater than 0.5mm, in particular greater than 1mm, preferably greater than 1.5mm, particularly preferably greater than 2mm.
Description
The invention relates to a sheet adapted to be fitted into a nozzle of a headbox of a paper machine for separating two suspension flows flowing through the nozzle, the sheet being provided with a sheet body having a sheet body width, a sheet body length and a sheet body thickness and having a downstream end, the sheet body length and the sheet body width defining a first fluid face and a second fluid face opposite the first fluid face and a film protruding from the downstream end of the sheet body being fixed at the downstream end on the first fluid face or on the second fluid face.
Devices of this type are known. Document DE4329810 A1 discloses a sheet plate with an end region of a headbox of a paper machine. In order to avoid or reduce periodic vortex shedding, various embodiments of the end regions of the lamellae are proposed. In one example, the sheet ends are provided with a membrane protruding from the sheet ends. The film is fixed here on the top side or the bottom side of the sheet.
By means of the known solutions, the influence of the vortex separation on the quality of the finished web can be reduced to only a specific operating window, for example a smaller speed range. Furthermore, the construction of the sheet is unsatisfactory in terms of cost and function.
The technical problem underlying the present invention is therefore to improve the construction and the function of the lamellae of a headbox of a paper machine, and to provide a method for manufacturing lamellae and to propose a headbox with at least one lamella which is intended for good jet quality.
The technical problem is solved by a sheet. A sheet is proposed which is suitable for being fitted into the nozzle of a headbox of a paper machine for separating two suspension flows flowing through the nozzle. The sheet includes a sheet body having a sheet body width, a sheet body length, and a sheet body thickness, and a downstream end portion, the sheet body length and the sheet body width defining a first fluid face and a second fluid face opposite the first fluid face, and a film protruding from the downstream end portion of the sheet body is secured to the first fluid face and to the second fluid face at the downstream end portion. The invention is characterized in that the film protrudes beyond the downstream end of the sheet metal body by a protrusion amount which is greater than 0.5mm, in particular greater than 1mm, preferably greater than 1.5mm, particularly preferably greater than 2mm.
The length of the sheet extends in the direction of the flowing suspension flow and the width of the sheet extends in a direction transverse to the suspension flow.
The film preferably extends over the entire width of the sheet body.
The solution according to the invention has the advantage that the turbulence ending up at the downstream end of the sheet body does not affect the whole film area. In this way, on the one hand, good paper quality can be achieved without hydraulic disturbances, and on the other hand, good ply separation between the different plies can be achieved for a multi-ply headbox.
It is also advantageous if the film protrudes beyond the downstream end of the sheet metal body by a protrusion which is less than 50mm, in particular less than 30mm, preferably less than 20mm, particularly preferably less than 10mm. If the protrusion is chosen to be greater, there is a risk that the membrane itself will interfere with and flutter in the fluid under certain conditions. Furthermore, the mechanical stress of the connection between the membrane and the sheet body increases. This can lead to loosening of the connection.
Preferably, the sheet thickness is in the range between 3mm and 6mm, preferably in the range between 3.5mm and 4.5 mm.
The sheet thickness can be reduced on the downstream end by beveling on the first fluid face and/or on the second fluid face to an end thickness of between 0.2mm and 2mm, in particular between 0.5mm and 1 mm. The first and second fluid surfaces thus form a pointed end having an acute or wedge angle at the downstream end of the sheet metal body. This reduces vortex generation and increases the operating window.
It is particularly advantageous if the chamfer has a first chamfer angle with respect to the first fluid face and/or a second chamfer angle with respect to the second fluid face. The wedge angle is in this case in the range between 1 ° and 9 °, in particular in the range between 1.5 ° and 6 °, preferably in the range between 2 ° and 5 °. In the case of single-sided beveling, the bevel angle corresponds to the wedge angle of the sheet body.
In the case of double-sided beveling, the sum of the two bevel angles corresponds to the wedge angle of the sheet metal body. Preferably, the sheet plate body is symmetrically beveled such that the first chamfer angle is equal to the second chamfer angle. The wedge angle also has a value in the range between 1 ° and 9 °, in particular between 1.5 ° and 6 °, preferably between 2 ° and 5 °.
The film may be fixed over the entire length of the sheet or may be fixed over a portion of the length of the sheet.
If the membrane is connected to the sheet metal body only in the region of the downstream end, the membrane can be arranged in a recessed manner in the respective fluid surface.
Preferably, the film and the sheet body are connected by bonding or welding.
It is particularly preferred that the film has a film thickness of between 0.05mm and 0.3mm, preferably between 0.1mm and 0.2 mm.
It is also possible to implement the sheet metal body with a film material that differs from the sheet metal body material or with a film material that differs from the sheet metal body material in terms of mechanical properties by mechanical or thermal treatment. In this way, components, such as the sheet body and the film of the sheet, can be optimized according to specific requirements and in terms of construction costs. The sheet plate must have minimal rigidity in order to maintain the geometry of the fluid passages in the nozzle. Conversely, the membrane must be just soft enough not to induce turbulence in the fluid and to buffer the turbulence created at the ends of the sheet.
In the case of the same sheet material and film material, the film material may be treated mechanically by uniaxial or biaxial stretching, for example in the direction of the sheet length or additionally also in the direction of the sheet width, before being connected to the sheet. Alternatively, heat may be applied. The bending strength can be optimized by stretching without changing other geometric parameters.
The sheet material may be selected from the group consisting of: plastic, CFK (carbon fiber reinforced plastic), PPSU (polyphenylsulfone), PC (polycarbonate), PET (polyethylene terephthalate), PE (polyethylene), metal.
CFKs are particularly advantageous as materials in terms of shape stability, thermal and chemical properties and weight and in terms of construction by way of structural possibilities.
The film material may be selected from the following group: plastic, PET (polyethylene terephthalate), PC (polycarbonate), PE (polyethylene), metal.
The material PET is particularly suitable for uniaxial or biaxial stretching to optimize flexural strength.
The problem is also solved by a headbox with a turbulence generator and a nozzle in which at least one sheet according to the invention is used.
The nozzle of the headbox has a nozzle length. The sheet length of at least one sheet may be shorter or longer than the nozzle length. This means that the lamellae may end on the one hand inside the nozzle and on the other hand also outside the nozzle.
If multiple sheets are applied in a headbox nozzle, a portion of the sheets end inside the nozzle and the remaining portion of the sheets end outside the nozzle.
The sheet lengths may be different.
The sheet may be applied in a single-layer headbox which operates with only one fiber suspension. It is however also possible that the lamellae are applied in a multi-layer headbox into which at least two different fiber suspensions are fed. In this case, at least two different fiber suspensions are separated by a sheet to form a multi-layer fiber web in a subsequent forming section.
The technical problem is also solved by a method for manufacturing a sheet for loading into a nozzle of a headbox of a paper machine for separating two suspension flows flowing through the nozzle. The sheet includes a sheet body having a sheet body width, a sheet body length, and a sheet body thickness, and having a downstream end, the sheet body length and the sheet body width defining a first fluid face and a second fluid face opposite the first fluid face, and a film protruding from the downstream end of the sheet body is secured on the first fluid face and on the second fluid face at the downstream end. According to the invention, the film protrudes beyond the downstream end of the sheet metal body by an amount which is selected to be greater than 0.5mm, in particular greater than 1mm, preferably greater than 1.5mm, particularly preferably greater than 2mm.
It is also advantageous that the film material comprises a plastic which is stretched uniaxially, preferably in the direction of the projection or biaxially.
Other technical features and advantages of the present invention are given by the following description of the preferred embodiments in conjunction with the accompanying drawings.
In the drawings:
fig. 1 shows a schematic simplified diagram of a first embodiment of a sheet according to the invention;
Fig. 2 shows a schematic simplified diagram of a second embodiment of a lamella according to the invention;
fig. 3 shows a schematic simplified view of a third embodiment of a lamella according to the invention;
fig. 4 shows a schematic simplified diagram of a fourth embodiment of a lamella according to the invention;
FIG. 5 shows a schematic simplified diagram of an embodiment of a headbox having a sheet according to the invention;
In fig. 1 to 4, schematic simplified diagrams of different embodiments of a lamella 1 according to the invention are shown. The sheet 1 in this described embodiment has its length significantly reduced with respect to the thickness in order to be able to better identify the details. The sheet 1 according to the invention is designed for being fitted into a nozzle 17 of a headbox 16 of a paper machine. As shown in fig. 5, the lamellae serve here to separate two suspension flows flowing through the nozzle 17. The sheet 1 may be applied in a single-layer headbox which operates with only one fibre suspension. It is however also possible that the sheet 1 is applied in a multi-layer headbox into which at least two different fiber suspensions are fed. In this case, at least two different fiber suspensions are kept separate by the sheet 1 in order to form a multi-layer fiber web in the subsequent forming section.
According to fig. 1, the sheet 1 comprises a sheet body 3 having a sheet body width, a sheet body length 4 and a sheet body thickness 5 and having a downstream end 8. The sheet length 4 and the sheet width facing inwards of the drawing and perpendicular to the sheet length 4 define a first fluid face 6 and a second fluid face 7 opposite the first fluid face 6. At the downstream end 8, a membrane 13 protruding beyond the downstream end 8 of the sheet plate 3 is fixed on the first fluid face 6 or on the second fluid face 7. The film material is plastic, preferably PET, and in this embodiment differs from the sheet metal material designed as CFK.
The film is stretched biaxially or uniaxially, preferably in the direction of the projection 14, before being joined to the sheet 3. The mechanical properties of the membrane 13 are thereby optimized, that is to say the change in function of avoiding or alleviating fluid swirling is made. The necessary bending strength can be achieved with a small film thickness. The film 13 protrudes beyond the downstream end 8 of the sheet body 3 by a protrusion 14, and the protrusion 14 is greater than 0.5mm, particularly greater than 1mm, preferably greater than 1.5mm, particularly preferably greater than 2mm. The projection 14 of the film 13 is preferably less than 50mm, in particular less than 30mm, preferably less than 20mm, particularly preferably less than 10mm. The sheet thickness 5 is in the range between 3mm and 6mm, preferably in the range between 3.5mm and 4.5 mm. In fig. 1, the sheet thickness 5 is reduced at the downstream end 8 by a chamfer on the first fluid face 6 to an end thickness 9 of between 0.2mm and 2mm, in particular between 0.5mm and 1 mm. The first fluid surface 6 and the second fluid surface 7 form a tip with an acute or wedge angle 2 at the downstream end 8 of the sheet metal body 3. In the embodiment of fig. 1, the chamfer has a first chamfer angle 10 in the range between 1 ° and 9 °, in particular in the range between 1.5 ° and 6 °, preferably in the range between 2 ° and 5 °, with respect to the first fluid surface 6. The value of the chamfer angle 10 corresponds to the wedge angle 12. The membrane 13 is fixed to only a part of the sheet length 4, in this embodiment by adhesive bonding, and is located on the second fluid face 7. The film 13 has a film thickness 15 of between 0.05mm and 0.3mm, preferably between 0.1mm and 0.2 mm.
The second embodiment of the sheet 1 according to the invention according to fig. 2 differs from the embodiment according to fig. 1 only in that the membrane 13 is arranged in a depressed manner in the second fluid surface 7. An advantage of this embodiment is that the membrane 13 does not form an abutment edge or interface edge.
In a third embodiment of the sheet 1 according to the invention in fig. 3, a membrane 13 is arranged on the chamfer of the first fluid face 6 and is fixed there by means of bonding.
Fig. 4 shows a further embodiment of the lamella 1, wherein a chamfer has been implemented on both sides of the lamella 1. In the case of such a double-sided chamfer, the sum of the two chamfer angles 10, 11 corresponds to the wedge angle 12 of the sheet metal body. In this embodiment, the wedge angle 12 also has a value in the range between 1 ° and 9 °, in particular in the range between 1.5 ° and 6 °, preferably in the range between 2 ° and 5 °. Preferably, the sheet plate body 3 is symmetrically beveled such that the first chamfer angle 10 is equal to the second chamfer angle 11. The membrane 13 is placed on the chamfer of the first fluid face 6 and is fixed on the chamfer of the first fluid face 6 by means of bonding.
Fig. 5 shows a schematic simplified view of an embodiment of a headbox 16 with two lamella 1 according to the invention. The headbox 16 comprises a vortex generator 19 and a nozzle 17. The headbox 16 is suitable as a multi-layer headbox or a single-layer headbox. The suspension flow passes through a vortex generator 19 comprising a tube bundle and then flows through the nozzle in a fluid direction 20. In the case of a single-layer headbox, the sheet 1 on the one hand slows down the large vortices in the flow of the fiber suspension and on the other hand avoids that the fiber suspension forms vortices at the ends of the sheet 1. In the case of a multi-layer headbox, the sheet 1 keeps the different fibre suspensions separate and the different fibre suspension layers are gently brought together at the end of the sheet 1, i.e. without vortex generation, so that the layer separation is maintained after the end of the sheet. The first fluid surface 6 of the sheet 1 is constituted by the top side of the sheet 1 and correspondingly the second fluid surface 7 is constituted by the bottom side of the sheet 1. The first fluid surface 6 of the sheet 1 may also be constituted by the bottom side of the sheet 1, while the second fluid surface 7 is constituted by the top side of the sheet 1 accordingly. It is also possible that the first fluid surface 6 of the upper plate 1 is constituted by the top side of the plate 1, while the first fluid surface 6 of the lower plate 1 is constituted by the top side of the lower plate 1. The orientation of the position of the sheet in the nozzle 17 is also freely selectable. In this embodiment, the sheet length 2 is implemented to be less than the nozzle length 18. The lamellae thus end in the interior of the nozzle.
Corresponding elements of the embodiments in the drawings are denoted by the same reference numerals. The functions of such elements in the various figures correspond to each other, provided that they are not otherwise indicated and are not mutually inconsistent. And thus duplicate description is omitted. It is to be noted, however, that the different technical features of the illustrated embodiments can be interchanged and combined with one another. The invention is therefore not limited to the shown technical feature combinations of the shown embodiments.
List of reference numerals
1. Sheet plate
2. Sheet length
3. Sheet plate body
4. Length of sheet plate
5. Thickness of sheet plate
6. First fluid surface
7. Second fluid face
8. Downstream end portion
9. End thickness
10. First chamfer angle
11. Second chamfer angle
12. Wedge angle
13. Film and method for producing the same
14. Protrusion amount
15. Film thickness
16. Head box
17. Nozzle
18. Nozzle length
19. Vortex generator
20. Flow direction
Claims (28)
1. A sheet (1) adapted to be fitted into a nozzle (17) of a headbox (16) of a paper machine for separating two suspension flows flowing through the nozzle (17), the sheet being provided with a sheet body (3) having a sheet body width, a sheet body length (4) and a sheet body thickness (5) and having a downstream end (8), the sheet body length (4) and the sheet body width defining a first fluid face (6) and a second fluid face (7) opposite the first fluid face (6) and a membrane (13) protruding from the downstream end (8) of the sheet body (3) being fixed at the downstream end (8) on the first fluid face (6) or on the second fluid face (7),
It is characterized in that the method comprises the steps of,
The film (13) protrudes beyond the downstream end (8) of the sheet body (3) by a protruding amount (14), and the protruding amount (14) is greater than 0.5mm.
2. A sheet according to claim 1,
It is characterized in that the method comprises the steps of,
The film (13) protrudes beyond the downstream end (8) of the sheet body (3) by the protruding amount (14), and the protruding amount (14) is less than 50mm.
3. The sheet according to claim 1 or 2,
It is characterized in that the method comprises the steps of,
The thickness (5) of the sheet body is in the range between 3mm and 6 mm.
4. The sheet according to claim 1 or 2,
It is characterized in that the method comprises the steps of,
The sheet thickness (5) is reduced at the downstream end (8) to an end thickness (9) of between 0.2mm and 2mm by beveling on a first fluid face (6) and/or on a second fluid face (7), and the first and second fluid faces constitute a tip with a wedge angle (12) on the downstream end (8) of the sheet (3).
5. The sheet according to claim 4,
It is characterized in that the method comprises the steps of,
The wedge angle (12) has a value in the range between 1 DEG and 9 deg.
6. The sheet according to claim 1 or 2,
It is characterized in that the method comprises the steps of,
The film (13) is fixed over the entire sheet length (4) or over a portion of the sheet length (4).
7. The sheet according to claim 1 or 2,
It is characterized in that the method comprises the steps of,
The membrane (13) is arranged in a recessed manner in the respective fluid surface (6, 7).
8. The sheet according to claim 1 or 2,
It is characterized in that the method comprises the steps of,
The film (13) has a film thickness (15) of between 0.05mm and 0.3 mm.
9. The sheet according to claim 1 or 2,
It is characterized in that the method comprises the steps of,
The sheet metal body is embodied in such a way that the film material differs from the sheet metal body material and/or that the film material differs from the sheet metal body material in terms of its mechanical properties by means of a mechanical treatment or a thermal treatment.
10. The sheet according to claim 1 or 2,
It is characterized in that the method comprises the steps of,
The sheet plate body material and the film material are respectively plastic or metal.
11. The sheet according to claim 1 or 2,
It is characterized in that the method comprises the steps of,
The film material is PET (polyethylene terephthalate), PC (polycarbonate), PPSU (polyphenylsulfone) or PE (polyethylene).
12. A sheet according to claim 1,
Characterized in that the projection (14) is greater than 1mm.
13. A sheet according to claim 1,
Characterized in that the protrusion (14) is greater than 1.5mm.
14. A sheet according to claim 1,
Characterized in that the projection (14) is greater than 2mm.
15. A sheet according to claim 2,
Characterized in that the protrusion (14) is less than 30mm.
16. A sheet according to claim 2,
Characterized in that the protrusion (14) is less than 20mm.
17. A sheet according to claim 2,
Characterized in that the protrusion (14) is less than 10mm.
18. A sheet according to claim 3,
The sheet is characterized in that the thickness (5) of the sheet body is in the range between 3.5mm and 4.5 mm.
19. The sheet according to claim 4,
Characterized in that the sheet thickness (5) is reduced at the downstream end (8) to an end thickness (9) of between 0.5mm and 1mm by beveling on the first fluid face (6) and/or on the second fluid face (7).
20. The sheet according to claim 4,
Characterized in that the wedge angle (12) has a value in the range between 1.5 DEG and 6 deg.
21. The sheet according to claim 4,
Characterized in that the wedge angle (12) has a value in the range between 2 DEG and 5 deg.
22. The sheet according to claim 1 or 2,
Characterized in that the film (13) has a film thickness (15) of between 0.1mm and 0.2 mm.
23. The sheet according to claim 1 or 2,
The sheet plate is characterized in that the sheet plate body material is CFK (carbon fiber reinforced plastic), PPSU (polyphenylsulfone), PC (polycarbonate), PET (polyethylene terephthalate) or PE (polyethylene).
24. A headbox (16) of a paper machine, said headbox having a vortex generator (19) and a nozzle (17),
It is characterized in that the method comprises the steps of,
Use of at least one sheet (1) according to any one of claims 1 to 23 in the nozzle (17) in order to separate two suspension flows flowing through the nozzle (17).
25. The headbox of claim 24,
It is characterized in that the method comprises the steps of,
The nozzle (17) has a nozzle length (18) and the sheet has a sheet length (2), wherein the sheet length (2) is shorter or longer than the nozzle length (18).
26. A method for manufacturing a lamella (1) adapted to be fitted into a nozzle (17) of a headbox (16) of a paper machine for separating two suspension flows flowing through the nozzle, the lamella being provided with a lamella body width, a lamella body length (4) and a lamella body thickness (5) and having a downstream end (8), the lamella body length (4) and the lamella body width defining a first fluid face (6) and a second fluid face (7) opposite the first fluid face (6), and a membrane (13) protruding from the downstream end (8) of the lamella body (3) being fixed at the downstream end (8) on the first fluid face (6) or on the second fluid face (7),
It is characterized in that the method comprises the steps of,
The film (13) protrudes beyond the downstream end (8) of the sheet body (3) by a protruding amount (14), and the protruding amount (14) is selected to be greater than 0.5mm.
27. The method according to claim 26,
It is characterized in that the method comprises the steps of,
The film material comprises a plastic that is biaxially or uniaxially stretched.
28. The method according to claim 27,
Characterized in that the plastic is stretched in the direction of the projection (14).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102019126296.8 | 2019-09-30 | ||
| DE102019126296.8A DE102019126296A1 (en) | 2019-09-30 | 2019-09-30 | Lamella for a headbox and method for producing a lamella |
| PCT/EP2020/069835 WO2021063556A1 (en) | 2019-09-30 | 2020-07-14 | Lamella for a headbox, and method for producing a lamella |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114555882A CN114555882A (en) | 2022-05-27 |
| CN114555882B true CN114555882B (en) | 2024-06-07 |
Family
ID=71738097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080070207.XA Active CN114555882B (en) | 2019-09-30 | 2020-07-14 | Sheet for a headbox and method for producing a sheet |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4038234A1 (en) |
| CN (1) | CN114555882B (en) |
| DE (1) | DE102019126296A1 (en) |
| WO (1) | WO2021063556A1 (en) |
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|---|---|---|---|---|
| DE4329810A1 (en) * | 1993-09-03 | 1994-06-23 | Voith Gmbh J M | Papermaking stock inlet blades |
| EP0711869A2 (en) * | 1994-11-10 | 1996-05-15 | Voith Sulzer Papiermaschinen Gesellschaft mbH | Multi-layer headbox |
| DE102007036535A1 (en) * | 2007-08-02 | 2009-02-05 | Voith Patent Gmbh | Headbox for machine for manufacturing multi-fiber fabric has lamella tip axis arranged at angle to main lamella axis of main lamella part so that free jet is deflected in desired direction |
| CN102216521A (en) * | 2008-12-18 | 2011-10-12 | 福伊特专利公司 | Headbox for a machine for producing a fibrous web |
| CN102257214A (en) * | 2008-10-24 | 2011-11-23 | 福伊特专利公司 | Dual-layer material ramp for a machine for producing a dual-layered fibrous web |
| CN102753754A (en) * | 2010-02-05 | 2012-10-24 | 福伊特专利公司 | Headbox and sheet-forming unit comprising a headbox |
| CN103717801A (en) * | 2011-08-04 | 2014-04-09 | 沃依特专利有限责任公司 | Sheet forming system for a machine for producing a two-layer or multi-layer web |
| CN108291367A (en) * | 2015-11-30 | 2018-07-17 | 福伊特专利有限公司 | Equipment for manufacturing fibrous cloth width |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4225297C2 (en) * | 1992-07-31 | 1996-11-28 | Voith Sulzer Papiermasch Gmbh | Headbox for a paper machine |
-
2019
- 2019-09-30 DE DE102019126296.8A patent/DE102019126296A1/en not_active Withdrawn
-
2020
- 2020-07-14 EP EP20743609.8A patent/EP4038234A1/en active Pending
- 2020-07-14 WO PCT/EP2020/069835 patent/WO2021063556A1/en unknown
- 2020-07-14 CN CN202080070207.XA patent/CN114555882B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4329810A1 (en) * | 1993-09-03 | 1994-06-23 | Voith Gmbh J M | Papermaking stock inlet blades |
| EP0711869A2 (en) * | 1994-11-10 | 1996-05-15 | Voith Sulzer Papiermaschinen Gesellschaft mbH | Multi-layer headbox |
| DE102007036535A1 (en) * | 2007-08-02 | 2009-02-05 | Voith Patent Gmbh | Headbox for machine for manufacturing multi-fiber fabric has lamella tip axis arranged at angle to main lamella axis of main lamella part so that free jet is deflected in desired direction |
| CN102257214A (en) * | 2008-10-24 | 2011-11-23 | 福伊特专利公司 | Dual-layer material ramp for a machine for producing a dual-layered fibrous web |
| CN102216521A (en) * | 2008-12-18 | 2011-10-12 | 福伊特专利公司 | Headbox for a machine for producing a fibrous web |
| CN102753754A (en) * | 2010-02-05 | 2012-10-24 | 福伊特专利公司 | Headbox and sheet-forming unit comprising a headbox |
| CN103717801A (en) * | 2011-08-04 | 2014-04-09 | 沃依特专利有限责任公司 | Sheet forming system for a machine for producing a two-layer or multi-layer web |
| CN108291367A (en) * | 2015-11-30 | 2018-07-17 | 福伊特专利有限公司 | Equipment for manufacturing fibrous cloth width |
Also Published As
| Publication number | Publication date |
|---|---|
| EP4038234A1 (en) | 2022-08-10 |
| WO2021063556A1 (en) | 2021-04-08 |
| DE102019126296A1 (en) | 2021-04-01 |
| CN114555882A (en) | 2022-05-27 |
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