EP0939842B2 - Caisse de tete multicouche destinee a une machine de fabrication de papier - Google Patents
Caisse de tete multicouche destinee a une machine de fabrication de papier Download PDFInfo
- Publication number
- EP0939842B2 EP0939842B2 EP97927534A EP97927534A EP0939842B2 EP 0939842 B2 EP0939842 B2 EP 0939842B2 EP 97927534 A EP97927534 A EP 97927534A EP 97927534 A EP97927534 A EP 97927534A EP 0939842 B2 EP0939842 B2 EP 0939842B2
- Authority
- EP
- European Patent Office
- Prior art keywords
- upstream
- downstream
- stock
- section
- slice chamber
- 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.)
- Expired - Lifetime
Links
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 93
- 239000000463 material Substances 0.000 claims abstract description 32
- 239000003365 glass fiber Substances 0.000 claims abstract description 12
- 239000003822 epoxy resin Substances 0.000 claims abstract description 11
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 3
- 230000007423 decrease Effects 0.000 claims description 12
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 7
- 239000010959 steel Substances 0.000 abstract description 7
- 229920000515 polycarbonate Polymers 0.000 description 16
- 239000004417 polycarbonate Substances 0.000 description 16
- 230000000694 effects Effects 0.000 description 5
- 239000004744 fabric Substances 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- 238000005189 flocculation Methods 0.000 description 3
- 230000016615 flocculation Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- D21F9/006—Complete machines for making continuous webs of paper of the twin-wire type paper or board consisting of two or more layers
-
- 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
- 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
Definitions
- the present invention relates to a multilayer headbox for ejecting stock into a forming section of a papermaking machine for forming a fibrous web.
- the forming section may comprise a single forming fabric, a forming fabric in combination with a felt, or a pair of forming fabrics.
- water drains from the stock through a forming fabric so that a fibrous web is formed.
- layer purity should be understood as the degree to which the separate layers of the fibrous web are able to retain their respective composition, i. e. the degree to which mixing of the layers is avoided, while coverage should be understood as the degree to which each layer of the fibrous web has a uniform basis weight in the cross machine direction.
- the formed web has a poor coverage, this will have an adverse effect on the uniformity of the layer purity, which will render the operation of the papermaking machine more difficult since a uniform layer purity is required during subsequent phases of the papermaking process, e. g. during creping when the creping doctor will be adjusted in accordance with the surface properties of the fibrous web on the side adhering to the drying cylinder.
- a uniform layer purity is required during subsequent phases of the papermaking process, e. g. during creping when the creping doctor will be adjusted in accordance with the surface properties of the fibrous web on the side adhering to the drying cylinder.
- chemicals are added to the process in order to facilitate creping and the quantity and composition of the chemicals will depend on the surface qualities of the fibrous web.
- a web of non-uniform layer purity will render impossible an optimization of the papermaking process since adjustment of the creping doctor and the adding of chemicals will depend on the surface qualities of the fibrous web.
- the paper web should have a uniform strength across the web (i. e. in the cross machine direction) and a web having poorcoverage will not be of uniform strength across the web. Therefore, there is a need for a multilayer headbox which is able to produce a multilayered web which has a good and uniform layer purity and a good coverage and which is also free of flocculations and has a uniform basis weight.
- the object of the invention is to provide a multilayer headbox, which is able to produce a layered fibrous web that has a good and uniform layer purity and that is free of flocculations and has a uniform basis weight.
- the object of the invention is attained by the present invention which is directed to a multilayer headbox for a papermaking machine.
- the headbox comprises a slice chamber which has an upstream inlet where stock is intended to enter the slice chamber and a downstream outlet through which stock is intended to pass from the slice chamber to a subsequent forming section of the papermaking machine.
- the slice chamber has an intended straight main direction of flow of the stock from the inlet of the slice chamber to the outlet of the slice chamber.
- the slice chamber has a top wall, a bottom wall and two side walls.
- the top and bottom walls converge in the straight main direction of flow of the stock through the slice chamber.
- the headbox further comprises a tube bank located upstream of the slice chamber in the direction of flow of the stock.
- the tube bank comprises a plurality of straight tubes.
- the tubes of the tube banks are arranged in vertically spaced tube bank sections such that each tube bank section in the tube bank is arranged to feed stock exclusively intended for one layer of the fibrous web to be formed.
- the tubes are arranged in vertically spaced rows, the rows extending in a cross machine direction.
- the tube bank can thus be described as comprising a plurality of straight tubes where the tubes are arranged in separate vertically spaced rows.
- Each tube has an upstream inlet end and a downstream outlet end from which stock is intended to pass into the inlet of the slice chamber such that the tube bank with its tubes forms a passage through which stock is intended to pass from the upstream inlet end of the tubes to the inlet of the slice chamber.
- the passage has a straight main direction of flow of the stock which coincides with the intended straight main direction of flow of the stock in the slice chamber so that all the way from the upstream inlet end of the tubes to the downstream outlet of the slice chamber, the stock will flow in one and the same straight main direction of flow.
- the headbox comprises at least one, but possibly two or three, machine-wide separator vane or vanes in the slice chamber.
- the separator vane (or vanes) subdivides the slice chamber such that a multilayered fibrous web may be formed.
- the separator vane (or vanes) has an upstream end and a downstream end and extend in the intended direction of flow of the stock and has a thickness in the vertical dimension.
- elongate ledges are provided that extend in a cross machine direction and connect the tube bank sections to each other.
- the upstream end of the separator vane (or of each separator vane) is fastened to one of the elongate ledges interposed between the vertically spaced tube bank sections in the tube bank.
- Such a headbox is known from WO-A-95/08023 and forms the preamble of claim 1.
- the headbox further comprises, in the slice chamber, a plurality of machine-wide turbulence generating elements extending in the direction of flow of the stock.
- Each turbulence generating element has an upstream end and a downstream end.
- the upstream end of each turbulence generating element is interposed between the vertically spaced rows of tubes in a tube bank section and fixed between the rows.
- the turbulence generating elements can be realized in the form of vanes with uneven, i. e. rough surface but the inventors have found that also vanes with a smooth surface will have a turbulence generating effect which is sufficient for the purpose of the invention.
- the separator vanes are made to have a certain minimum stiffness in the cross machine direction for at least 7/10 of the length of the separator vane.
- the stiffness of the separator vane is chosen to be on average at least 36 Nm and on at least 7/10 of the length of each separator vane, at least 7 Nm.
- the separator vane (or vanes) should have an average stiffness which is at least 180 times higher than the stiffness of a 1 mm thick reference sheet or reference plate of a material having a modulus of elasticity of about 2100 MPa and that for at least 7/10 of the length of the vane (or vanes), the stiffness should be at least 35 times higher than for the reference sheet or reference plate.
- the separator vane (or separator vanes) is a homogenous element made of glass fiber reinforced epoxy resin and is tapered all the way from its upstream end to its downstream end such that its thickness decreases continuously from its upstream end to its downstream end.
- the separator vane (or vanes) is divided into an upstream section of constant thickness in the vertical dimension and a downstream section which is tapered such that its thickness decreases in the direction of flow of the stock.
- the upstream section will have an upstream end which is the same as the upstream end of the separator vane and a downstream end to which the downstream section is fixed.
- the downstream section will have an upstream end fixed to the upstream section of the separator vane and a downstream end which is the same as the downstream end of the separator vane.
- the downstream section has a thickness in the vertical dimension which is less than the thickness in the vertical dimension of the upstream section.
- the upstream section might be of steel while the downstream section is preferably of glass fiber reinforced epoxy resin.
- the separator vane(s) is a homogenous element tapered all the way from its upstream end to its downstream end
- the separator vane(s) has a surface smoothness, or R a value, which is smaller than or equal to 0.4 ⁇ m.
- the tapered downstream section has surface smoothness, or R a value, which is smaller than or equal to 0.4 ⁇ m.
- the thickness in the vertical dimension of the separatorvane is less than 0.7 mm at the downstream end of the separator vane(s).
- the thickness in the vertical dimension should be about 0.5 mm.
- the thickness in the cross machine direction will of course be subject to a degree of variation. The inventors have found that the thickness at the downstream end should not vary more than 0.05 mm. When the thickness of the separator vane is chosen to be 0.5 mm, this will therefore result in a separator vane which, at its downstream end, has a thickness of 0.5 mm ⁇ 0.05 mm or 0.45 mm - 0.55 mm.
- Providing a separator vane, or separator vanes, having a surface smoothness which is, at least at a downstream end of the separator vane(s), smaller than 0.4 ⁇ m and having a thickness at its downstream end which is less than 0.7 mm contributes to the achievement of a good layer purity.
- layer purity it can be desirable to make the downstream end of the separator vane (or vanes) even thinner.
- the inventors have found that when the tip of a vane (the downstream end of the vane) is thinner than 0.5 mm, this makes the tip to weak and to likely to be broken by fatigue. Therefore, the inventors have found that a thickness of about 0.5 mm is preferable. In order to achieve that the layer purity will also be uniform, it is necessary that the formed web will also have a good coverage.
- the inventors have found that when the headbox is formed as a straight flow headbox, i. e. when the stock flows in one and the same main direction of flow all the way from the inlet end of the tubes in the tube bank to the outlet of the slice chamber, this will have an advantageous effect on the coverage of the subsequently formed fibrous web and that this advantageous effect can be reinforced by providing turbulence generating elements in the slice chamber.
- Headboxes are known, e g. from U. S. Patent No. 4,941,950 (Sanford), where the stock is forced to change its direction of flow when it enters the slice chamber.
- the inventors of the present invention have recognized that such a design will have a disadvantageous effect on the coverage of the fibrous web and therefore, the inventors have designed the headbox of the present invention as a straight flow headbox such that the stock will not change its direction of flow as it enters the slice chamber.
- the separator vane, or separator vanes should be stiff in the cross machine direction.
- the inventors have found that one important cause for poor coverage is insufficient stiffness of the separator vane(s) in the cross machine direction. If the stiffness of the vane(s) in the cross machine direction is insufficient, this may cause flexing of the vane(s) such that, in the cross machine direction, the layers of the subsequently formed web will not have a uniform basis weight in the cross machine direction, i. e. the coverage will be poor. It is also desirable that the stiffness in the machine direction is high if a fibrous web which is uniform in the machine direction is to be obtained.
- the separator vanes employed in the present invention are of such a design that their thickness decreases towards the tip of the vanes, i. e. the thickness of a vane is less at the downstream end of the vane than at the upstream end of the vane. Forthis reason, the stiffness of the vane is not uniform. Instead, the stiffness of each vane decreases towards the downstream end of the vane. Therefore, the stiffness of a separator vane according to the present invention has to be calculated at different locations of the vane.
- the Poisson ratio will normally be about 0.3 while for glass fiber reinforced resin, the Poisson ratio can be given as about 0.15. The stiffness is thus proportional to the product of the modulus of elasticity and the plate thickness.
- the material or materials used for the separator vane is isotropic in the sense that it has the same properties in both the machine direction and the cross machine direction (but not necessarily in the vertical dimension). Therefore, the stiffness of a separator vane, such as stiffness is defined in the context of this application, will be the same in both the machine direction and the cross machine direction.
- One way of increasing the stiffness is to increase the thickness of the vane(s). However, at the downstream end of the vane(s), the thickness of the van e(s) must be small, preferably less than 0.7 mm and preferably about 0.5 mm, in order to obtain good layer purity.
- the material or materials used for the separator vane (or vanes) is isotropic in the sense that it has the same properties in both the machine direction and the cross machine direction. For this reason, the stiffness at any given location along the length of a separator vane, as stiffness is defined in the context of this application, will be the same in both the machine direction and the cross machine direction.
- the tests carried out by the inventors showed that when the 1 mm thick reference sheet was used as a separator vane, the formed fibrous web had unsatisfactory coverage.
- the separator vane(s) has a stiffness in the cross machine direction which, for at least 7/10 (70%) of its length is at least 35 times greater than the stiffness of a 1 mm thick reference sheet of a polycarbonate material having a modulus of elasticity of about 2100 MPa.
- the vanes that where found to give satisfactory results with regard to the coverage of the formed fibrous web had an average stiffness which was at least 180 times higher than the stiffness of the reference sheet.
- average stiffness should here be understood as the stiffness value which is obtained by choosing at least 11 points on the separator vane evenly spaced from each other in the machine direction, adding the stiffness values of the different points and dividing the result by the number of points.
- 35 times greater than a 1 mm thick reference sheet of a material having a modulus of elasticity of about 2100 M Pa should here be understood as meaning that the stiffness at the upstream end of the separator vane(s) is much higher than a 1 mm thick sheet (or plate) of a polycarbonate material having a modulus of elasticity of about 2100 MPa and that the stiffness gradually decreases towards the downstream end of the separator vane(s) but that for at least 7/10 (70%) of its length, the vane(s) has a stiffness at least 35 times greater than a 1 mm thick reference sheet (or reference plate) of a polycarbonate material having a modulus of elasticity of about 2100 M Pa so that no more than 3/10 of the separator vane, at the downstream end of the separator vane, has a stiffness less than 35 times that of a 1 mm thick reference sheet of a polycarbonate material having a modulus of elasticity of about 2100 MPa.
- a separator vane (or separator vanes) which is tapered such that its thickness decreases linearly from its upstream end to its downstream end.
- the material used for this vane is an isotropic glass fiber reinforced epoxy resin having a modulus of elasticity of 25,000 MPa.
- this vane may have a thickness of 3.8 mm. The thickness gradually decreases towards the tip (the downstream end of the vane) where the thickness will be about 0.5 mm.
- the Poisson ratio is 0.15.
- the stiffness gradually decreases but for 7/10 (70%) of the length of the separator vane, the stiffness is at least 7 Nm and thus at least 35 times higher than the stiffness of the 1 mm thick reference sheet.
- the average stiffness in this case will be about 36 Nm and thus at least 180 times higher than the stiffness of the 1 mm thick reference sheet.
- the upstream section will have a substantially constant stiffness all the way from the upstream end of the vane(s) to the point where the downstream section of the separator vane(s) is fastened to the upstream section.
- the downstream section will then have a gradually decreasing stiffness.
- the upstream section of constant thickness may be of steel and have a modulus of elasticity of 203,000 MPa and a thickness of about 12 mm.
- the Poisson ratio ( v ) in this case is about 0.3.
- the length of the upstream steel section may be around 500 mm.
- the downstream section has a linearly decreasing thickness which goes from 3.8 mm at its upstream end to about 0.5 mm at its downstream end.
- the material chosen for the downstream section is glass fiber reinforced epoxy resin having a modulus of elasticity of 25000 M Pa and the Poisson ratio ( v ) is about 0.3.
- the length of the downstream section may be around 330 mm, giving the separator vane a total length of 830 mm.
- the stiffness of the upstream end of the downstream section as stiffness is defined in the context of this patent application, can be calculated as being 117.2 Nm.
- the stiffness of this separator vane will be at least 57 Nm and therefore more than 280 times stiffer than the 1 mm thick reference sheet.
- the average stiffness will be about 20449 Nm and therefore much more than 180 times higher than the stiffness of the reference sheet.
- the machine-wide step at the transition between the upstream section of the separator vane(s) and the downstream section of the vane(s) will also contribute to the achievement of good coverage.
- a headbox 1 With reference to FIG. 1, a headbox 1 is shown.
- the headbox has a slice chamber 2 which is limited by a top wall 3 and a bottom wall 4 and a pair of side walls (not shown).
- the slice chamber has an upstream inlet 5 and a downstream outlet 6 and during operation, the stock will pass from the inlet 5 to the outlet 6 such that the slice chamber can be described as having an intended straight main direction of flow from the upstream inlet 5 to the downstream outlet 6.
- the tube bank 18 comprises several sections 7, 8, 9 of tubes that are vertically spaced from each other.
- Each tube bank section in the tube bank comprises a plurality of straight tubes 10,11, 12, 13, 14, 15 and the tubes in each tube bank section are arranged in separate vertically spaced rows, the rows extending in a cross machine direction.
- Each tube has an upstream inlet end 16 through which stock is intended to enter the tube and a downstream outlet end 17 through which stock is intended to pass into the slice chamber at the inlet or inlet end 5 of the slice chamber 2.
- the tube bank 18 with its tubes thus forms a passage through which stock is intended to pass from the upstream inlet end of the tubes to the inlet of the slice chamber 2 and into the slice chamber 2.
- the passage constituted by the tube bank 18 has a straight main direction of flow which coincides with the straight main direction of flow of the stock in the slice chamber or, in other words, when the stock leaves the tube bank 18 and enters the slice chamber 2, the stock will notchange its direction of flow (the flow of stock will, of course, converge but the main direction of flow will remain unchanged). The stock will thus flow in one and the same main direction of flow all the way from the upstream inlet end of the tubes in the tube bank to the downstream outlet of the nozzle chamber.
- FIG. 3 a cross section of a 3-layered paper web is shown where the top and bottom layers may consist of short fibers while the middle layer may consist of long fibers. If the stock is instead forced to change its direction of travel as it enters the slice chamber, this will tend to result in a fibrous web of inferior coverage such that the formed fibrous web will have a cross section similar to the one indicated in FIG. 5. As can be seen in FIG. 5, the layers are well separated but each layer does not have a uniform basis weight.
- FIG. 4 shows a cross section of a paper web where the layers are mixed together with each other such that layer purity is poor.
- the headbox At the inlet of the slice chamber 2, interposed between the vertically spaced rows of tubes in the tube bank and connecting the tube rows to each other, the headbox is provided with elongate ledges 19 that extend in a cross machine direction.
- the elongate ledges 19 make possible the attachment of machine-wide separator vanes 20, 21 that subdivide the slice chamber into separate channels for the production of a multilayered fibrous web.
- FIG. 1 two separator vanes are shown but it is to be understood that the invention could equally well be applied to a headbox having only one separator vane or possibly three separator vanes.
- the separator vanes 20, 21, extend in the intended direction of flow of the stock and each of the machine-wide separator vanes 20, 21 has an upstream end 22 and a downstream end 23 and the upstream end of each separator vane is fastened to one of the elongate ledges interposed between the vertically spaced rows of tubes in the tube bank 18.
- the separator vanes are given a stiffness which is, on average, at least 36 Nm and which is , on a part of the separator vane stretching from the upstream end of the separator vane up to at least 7/10 (70 %) of the length of the separator vane, has a stiffness which is at least 7 Nm.
- the separator vanes will thereby have a stiffness which is, on average, at least 180 times greater than a 1 mm thick reference sheet or reference plate of a polycarbonate material having a modulus of elasticity of 2100 MPa and which, on a part of the separator vane stretching from the upstream end of the separator vane up to at least 7/10 of the length of the separator vane, has a stiffness in the cross machine direction which is at least 35 times greater than the stiffness of a 1 mm thick reference sheet or reference plate of a polycarbonate material having a modulus of elasticity of 2100 MPa.
- each separator vane is made of glass fiber reinforced epoxy resin having a modulus of elasticity of about 25,000 MPa and has a thickness calculated to result in an average stiffness of the separator vane in the cross machine direction which is at least 180 times higherthan the stiffness of a 1 mm thick reference sheet of a polycarbonate material having a modulus of elasticity of 2100 MPa and a stiffness which , from the upstream end of the separator vane over at least 7/10 (70%) of the length of the separator vane, is at least 35 times higher than the stiffness of a 1 mm thick reference sheet (or reference plate) of a polycarbonate material having a modulus of elasticity of 2100 MPa.
- FIG. 6 a comparative stiffness study between a 1 mm thick reference sheet of a polycarbonate material having a modulus of elasticity of 2100 MPa and two different separator vanes in accordance with the present invention is shown.
- curve 1 shows (as a reference) the stiffness of a 1 mm thick reference sheet (or reference plate) of a polycarbonate material having a modulus of elasticity of 2100 M Pa
- curve 2 shows the stiffness of a tapered separatorvane of glass fiber reinforced epoxy resin according to the preferred embodiment of the present invention as compared to that of the 1 mm thick reference sheet.
- the average value of the stiffness is, in this case, about 36.2 Nm and thus about 181 times higher than the reference value of the 1 mm thick reference sheet of a polycarbonate material having a modulus of elasticity of 2100 MPa and has, for 7/10 of the length of the vane, a stiffness of at least 7.1 Nm and thus 35.5 times higher than the stiffness of a 1 mm thick reference sheet of a polycarbonate material having a modulus of elasticity of 2100 MPa.
- the separator vane has a thickness at its upstream end of approximately 3.8 mm.
- each separator vane The thickness decreases linearly towards the downstream end of each separator vane, the length of which may be on the order of 800 - 850 mm, (the inventors envisage that 830 mm is a suitable choice of separator vane length) and at the downstream end of the vane, the thickness will be on the order of approximately 0.5 mm.
- the inventors have found that, in order to achieve good layer purity, the thickness of the vanes should not exceed 0.7 mm at the downstream end of the separator vanes.
- the inventors envisage that the thickness at the downstream end may be around 0.5 mm and that the variation in the thickness should be no greater than 0.05 mm.
- the thickness is chosen to be lower than 0.7 mm in order to achieve a good layer purity.
- a thickness of about 0.5 is preferred. With regard to the coverage, it is preferable that the thickness variation is no greater than 0.05 mm.
- the material used for the separator vanes is isotropic in the sense that it has the same mechanical properties in both the machine direction and the cross machine direction. It is to be noted that the mechanical properties in the vertical dimension are not necessarily the same as in the machine direction and the cross machine direction. The material used is therefore not necessarily isotropic in the sense that it has the same mechanical properties in all directions.
- each separator vane is composed of a machine-wide upstream section 31 and a machine-wide downstream section.
- the upstream section 31 has an upstream end which is the same as the upstream end of the separator vane itself, and a downstream end 33 to which the downstream section 29 is fixed.
- the upstream section is composed of a steel plate of constant thickness while the downstream section 29 is made of glass fiber reinforced epoxy resin.
- the steel plate has a modulus of elasticity of 203,000 MPa and its thickness is 12 mm.
- the stiffness of the upstream section can thus be calculated as being 32123 Nm and therefore 160615 times higher than the stiffness of the 1 mm reference sheet.
- the downstream section has an upstream end 30 and a downstream end 23 common with the downstream end of the separator vane itself.
- the upstream end 30 of the downstream section 29 is fixed to the downstream end 33 of an associated upstream section.
- the downstream section has, at its upstream end, a thickness which is less than the thickness of the downstream end of the upstream section so that at the transition between the upstream section and the downstream section, there is a machine-wide step 32.
- the machine-wide downstream section is tapered in such a way that its thickness decreases linearly in the direction of flow of the stock and is preferably made of glass fiber reinforced epoxy resin having a modulus of elasticity of 25,000 MPa.
- the downstream section 29 has, at its upstream end, a thickness of 3.8 mm and the stiffness at the upstream end can be calculated as being about 117 Nm as stiffness is defined in the context of this patent application.
- the thickness of the downstream section is made less than 0.7 mm at the downstream end of the downstream section.
- the thickness at the downstream end of the downstream section may be 0.5 mm with a maximum variation of 0.05 mm such that the thickness lies in the range 0.45 mm - 0.55 mm.
- the surface smoothness, or R a value, of the downstream section is made to be smaller than 0.4 ⁇ m.
- curve 3 shows the stiffness of a separator vane according to the second embodiment of the invention compared to the stiffness of a 1 mm thick reference sheet (or reference plate) of a polycarbonate material having a modulus of elasticity of 2100 MPa.
- the separator vane composed of an upstream section of constant thickness and a downstream tapered section has, during a first part of its length (the upstream section which has a constant thickness), a constant stiffness.
- the tapered downstream section has a gradually decreasing stiffness towards its downstream end.
- the average stiffness of this vane will be considerably higher than 180 times the stiffness of a 1 mm thick reference sheet of a polycarbonate material having a modulus of elasticity of 2100 MPa.
- the average stiffness of this separator vane as stiffness is defined in the context of this patent application, will be 20449 Nm.
- the stiffness will be higher than 57.1 Nm and therefore morethan 280 times higher than the stiffness of the 1 mm thick reference sheet of a polycarbonate material having a modulus of elasticity of 2100 MPa which has a stiffness of 2.1 Nm.
- the slice chamber 2 of the headbox is further provided with a plurality of machine-wide turbulence generating elements 25, 26, 27 as can be seen in FIG. 9.
- Each turbulence generating element is located in one of the separate flow channels formed either between the top wall 3 and a separator vane 20, 21, between two separatorvanes 20, 21 or between a separator vane 20, 21 and the bottom wall 4.
- Each of the machine-wide turbulence generating elements extends in the direction of flow of the stock and each turbulence generating element has an upstream end 34 and a downstream end 28.
- the upstream end 34 of each turbulence generating element 25, 26, 27 is interposed between two vertically spaced rows of tubes in the tube bank and fixed between said rows.
- the invention achieves that a multilayered fibrous web can be produced which has a good layer purity and a good coverage which assures that the layer purity will also be uniform.
- the fibrous web will have uniform strength properties across the web.
Landscapes
- Paper (AREA)
- Sheets, Magazines, And Separation Thereof (AREA)
- Making Paper Articles (AREA)
- De-Stacking Of Articles (AREA)
Claims (5)
- Caisse de tête (1) pour une machine de fabrication de papier comprenant :a) une chambre de règle (2) ayant un orifice d'entrée amont (5) dans laquelle il est prévu que la pâte à papier pénètre dans la chambre de règle (2) et un orifice de sortie (6) à travers lequel il est prévu que la pâte à papier passe de la chambre de règle (2) dans une section de formation suivante de la machine de fabrication de papier, la chambre de règle (2) ayant une direction principale droite d'écoulement de la pâte à papier entre l'orifice d'entrée (5) de la chambre de règle (2) et l'orifice de sortie (6) de la chambre de règle (2), la chambre de règle (2) ayant en outre une paroi supérieure (3) et une paroi inférieure (4), les parois supérieure et inférieure (3, 4) convergeant dans la direction principale droite de l'écoulement de la pâte à papier,b) dans la chambre de règle (2), au moins une palette de séparateur sur toute la largeur de la machine (20, 21) subdivisant la chambre de règle (2) en canaux d'écoulements séparés pour la production de toiles fibreuses multicouches, ladite au moins une palette de séparateur (20, 21) s'étendant dans la direction de l'écoulement de la pâte à papier et ayant une épaisseur dans le sens vertical et une extrémité amont (22) et une extrémité aval (23), ladite au moins une palette de séparateur (20, 21) ayant, entre son extrémité amont (22) et son extrémité aval (23) une épaisseur décroissante dans le sens vertical,
la caisse de tête multicouche étant caractérisée en ce qu'elle comprend en outre :c) une rampe de tubes (18) situés en amont de la chambre de règle (2) dans la direction de l'écoulement de la pâte à papier, la rampe de tubes (18) comprenant des sections de tube (7, 8, 9), chaque section de tube (7, 8, 9) comprenant une pluralité de tubes droits (10, 11 ; 12, 13 ; 14, 15) et les tubes (10, 11 ; 12, 13 ; 14, 15) de chaque section de tube étant agencés en rangées séparées espacées verticalement, les rangées s'étendant dans une direction transversale de la machine, chaque tube (10, 11 ; 12, 13; 14, 15) ayant une extrémité d'orifice d'entrée amont (16) dans laquelle il est prévu que la pâte à papier pénètre et une extrémité d'orifice de sortie aval (17) de laquelle il est prévu que la pâte à papier passe dans l'orifice d'entrée (5) de la chambre de règle (2), la rampe de tubes (18) formant un passage à travers lequel il est prévu que la pâte à papier passe de l'extrémité d'orifice d'entrée amont (16) des tubes (10, 11 ; 12, 13 ; 14, 15) à l'orifice d'entrée (5) de la chambre de règle (2), ledit passage ayant une direction principale droite d'écoulement de la pâte à papier qui coïncide avec la direction principale droite d'écoulement de la pâte à papier dans la chambre de règle (2) de telle sorte que tout le trajet entre l'extrémité d'orifice d'entrée amont (16) des tubes (10, 11 ; 12, 13 ; 14, 15) et l'orifice de sortie aval (6) de la chambre de règle (2), la pâte à papier s'écoule dans une seule et même direction principale droite d'écoulement,d) dans lesdits canaux d'écoulement séparés, une pluralité d'éléments générateurs de turbulence sur toute la largeur de la machine (25, 26, 27) qui s'étendent dans la direction de l'écoulement de la pâte à papier, chaque élément générateur de turbulence (25, 26, 27) ayant une extrémité amont (34) et une extrémité aval (28), ladite extrémité amont (34) étant interposée entre deux rangées espacées verticalement desdits tubes droits (10, 11 ; 12, 13 ; 14, 15), et étant fixée entre lesdites rangées, ete) ladite au moins une palette de séparateur (20, 21) ayant, au niveau de son extrémité aval (23), une épaisseur dans le sens vertical qui est inférieure à 0,7 mm et une rigidité qui, en moyenne, est égale à au moins 36 Nm et qui, sur au moins 7/10 de sa longueur a une rigidité égale à au moins 7 Nm, où la rigidité est définie comme égale àoù S est la rigidité de la palette de séparateur, E est le module d'élasticité du matériau de la palette de séparateur, h est l'épaisseur de la palette de séparateur, et v est le coefficient de Poisson pour le matériau de la palette de séparateur (20, 21). - Caisse de tête multicouche (1) selon la revendication 1, dans laquelle ladite au moins une palette de séparateur sur toute la largeur de la machine (20, 21) est faite d'une résine époxy renforcée de fibres de verre et est effilée sur toute sa longueur, entre son extrémité amont (22) et son extrémité aval (23) de telle sorte que son épaisseur dans le sens vertical diminue de manière continue entre son extrémité amont (22) et son extrémité aval (23).
- Caisse de tête multicouche (1) selon la revendication 1, dans laquelle ladite au moins une palette de séparateur (20, 21) est divisée en une section amont (31) d'épaisseur constante dans le sens vertical et une section aval (29) qui est effilée, de telle sorte que son épaisseur diminue dans la direction de l'écoulement de la pâte à papier et dans laquelle la section amont (31) a une extrémité amont (22) et une extrémité aval (33) et la section aval (29) a une extrémité amont (30) et une extrémité aval (23) et dans laquelle l'extrémité amont (30) de la section aval (29) est fixée sur l'extrémité aval (33) de la section amont (31) et dans laquelle l'extrémité amont (30) de la section aval (29) a une épaisseur, dans le sens vertical, qui est inférieure à l'épaisseur dans le sens vertical de l'extrémité aval (30) de la section amont (31), de telle sorte que, au point où la section amont (31) est fixée à la section aval (29), se trouve un épaulement sur toute la largeur de la machine (32).
- Caisse de tête selon la revendication 2, dans laquelle ladite au moins une palette de séparateur sur toute la largeur de la machine (20, 21) a un lissé de surface inférieur ou égal à 0,4 µm.
- Caisse de tête selon la revendication 3, dans laquelle la section aval (29) a un lissé de surface inférieur ou égal à 0,4 µm.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9602347A SE506931C2 (sv) | 1996-06-12 | 1996-06-12 | Flerskiktsinloppslåda för en pappersmaskin |
SE9602347 | 1996-06-12 | ||
PCT/SE1997/000921 WO1997047804A1 (fr) | 1996-06-12 | 1997-05-29 | Caisse de tete multicouche destinee a une machine de fabrication de papier |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0939842A1 EP0939842A1 (fr) | 1999-09-08 |
EP0939842B1 EP0939842B1 (fr) | 2002-09-04 |
EP0939842B2 true EP0939842B2 (fr) | 2006-06-28 |
Family
ID=20403001
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97927534A Expired - Lifetime EP0939842B2 (fr) | 1996-06-12 | 1997-05-29 | Caisse de tete multicouche destinee a une machine de fabrication de papier |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0939842B2 (fr) |
JP (1) | JP3194967B2 (fr) |
AT (1) | ATE223534T1 (fr) |
DE (1) | DE69715236T3 (fr) |
SE (1) | SE506931C2 (fr) |
WO (1) | WO1997047804A1 (fr) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10106684A1 (de) * | 2001-02-14 | 2002-08-29 | Voith Paper Patent Gmbh | Lamelle eines Stoffauflaufs einer Papier-, Karton- oder Tissuemaschine |
DE10256510A1 (de) * | 2002-12-04 | 2004-06-24 | Voith Paper Patent Gmbh | Stoffauflauf einer Papier- oder Kartonmaschine zur Herstellung einer Faserstoffbahn |
JPWO2006038285A1 (ja) * | 2004-10-05 | 2008-05-29 | 三菱重工業株式会社 | 抄紙機のフローシート及びその製造方法 |
EP2129830A4 (fr) * | 2007-03-01 | 2012-06-13 | Metso Paper Karlstad Ab | Élément structurel pour un élément fonctionnel d'une caisse d'arrivée dans une machine à papier, élément fonctionnel et caisse d'arrivée fabriqués à partir de celui-ci et procédés associés |
DE102008000564A1 (de) * | 2008-03-07 | 2009-09-10 | Voith Patent Gmbh | Vorrichtung zur Herstellung und/oder Behandlung einer Faserstoffbahn |
EP2707542A4 (fr) * | 2011-05-11 | 2015-04-08 | Hollingsworth & Vose Co | Systèmes et procédés de fabrication de bandes fibreuses |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3923593A (en) † | 1971-12-03 | 1975-12-02 | Beloit Corp | Multiple ply web former with divided slice chamber |
US4141788A (en) † | 1978-05-02 | 1979-02-27 | Beloit Corporation | Method of and means for forming multi-ply paper webs from a single headbox |
GB2046323A (en) † | 1979-04-12 | 1980-11-12 | Beloit Corp | Apparatus and method for forming multi-ply webs |
CA1139142A (fr) † | 1982-03-30 | 1983-01-11 | Ab Karlstads Mekaniska Werkstad | Caisse de tete |
EP0147350A2 (fr) † | 1983-11-25 | 1985-07-03 | Beloit Corporation | Elément traînant pour chambre de règle convergent |
EP0158584A2 (fr) † | 1984-04-11 | 1985-10-16 | Beloit Corporation | Elément traînant pour caisse de tête |
US4617091A (en) † | 1983-11-25 | 1986-10-14 | Beloit Corporation | Headbox trailing element |
DE3704462A1 (de) † | 1987-02-02 | 1988-08-11 | Escher Wyss Gmbh | Stoffauflauf fuer eine papiermaschine |
DE4329810A1 (de) † | 1993-09-03 | 1994-06-23 | Voith Gmbh J M | Geometrie des Lamellenendes eines Stoffauflaufes |
EP0581051B1 (fr) † | 1992-07-31 | 1995-11-29 | Voith Sulzer Papiermaschinen GmbH | Caisse de tête à plusieurs couches pour une machine à papier ou analogue |
EP0711869A2 (fr) † | 1994-11-10 | 1996-05-15 | Voith Sulzer Papiermaschinen Gesellschaft mbH | Caisse de tête à plusieurs couches |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE501798C2 (sv) * | 1993-09-13 | 1995-05-15 | Valmet Karlstad Ab | Flerskiktsinloppslåda |
-
1996
- 1996-06-12 SE SE9602347A patent/SE506931C2/sv not_active IP Right Cessation
-
1997
- 1997-05-29 JP JP50150598A patent/JP3194967B2/ja not_active Expired - Lifetime
- 1997-05-29 DE DE69715236T patent/DE69715236T3/de not_active Expired - Lifetime
- 1997-05-29 AT AT97927534T patent/ATE223534T1/de active
- 1997-05-29 EP EP97927534A patent/EP0939842B2/fr not_active Expired - Lifetime
- 1997-05-29 WO PCT/SE1997/000921 patent/WO1997047804A1/fr active IP Right Grant
Patent Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3923593A (en) † | 1971-12-03 | 1975-12-02 | Beloit Corp | Multiple ply web former with divided slice chamber |
US4141788A (en) † | 1978-05-02 | 1979-02-27 | Beloit Corporation | Method of and means for forming multi-ply paper webs from a single headbox |
GB2046323A (en) † | 1979-04-12 | 1980-11-12 | Beloit Corp | Apparatus and method for forming multi-ply webs |
CA1139142A (fr) † | 1982-03-30 | 1983-01-11 | Ab Karlstads Mekaniska Werkstad | Caisse de tete |
EP0147350A2 (fr) † | 1983-11-25 | 1985-07-03 | Beloit Corporation | Elément traînant pour chambre de règle convergent |
US4617091A (en) † | 1983-11-25 | 1986-10-14 | Beloit Corporation | Headbox trailing element |
EP0158584A2 (fr) † | 1984-04-11 | 1985-10-16 | Beloit Corporation | Elément traînant pour caisse de tête |
US4566945A (en) † | 1984-04-11 | 1986-01-28 | Beloit Corporation | Headbox trailing element |
DE3704462A1 (de) † | 1987-02-02 | 1988-08-11 | Escher Wyss Gmbh | Stoffauflauf fuer eine papiermaschine |
EP0581051B1 (fr) † | 1992-07-31 | 1995-11-29 | Voith Sulzer Papiermaschinen GmbH | Caisse de tête à plusieurs couches pour une machine à papier ou analogue |
DE4329810A1 (de) † | 1993-09-03 | 1994-06-23 | Voith Gmbh J M | Geometrie des Lamellenendes eines Stoffauflaufes |
EP0711869A2 (fr) † | 1994-11-10 | 1996-05-15 | Voith Sulzer Papiermaschinen Gesellschaft mbH | Caisse de tête à plusieurs couches |
Also Published As
Publication number | Publication date |
---|---|
EP0939842A1 (fr) | 1999-09-08 |
ATE223534T1 (de) | 2002-09-15 |
EP0939842B1 (fr) | 2002-09-04 |
SE9602347D0 (sv) | 1996-06-12 |
JPH11514050A (ja) | 1999-11-30 |
DE69715236T2 (de) | 2003-05-22 |
DE69715236T3 (de) | 2006-12-14 |
SE506931C2 (sv) | 1998-03-02 |
WO1997047804A1 (fr) | 1997-12-18 |
DE69715236D1 (de) | 2002-10-10 |
SE9602347L (sv) | 1997-12-13 |
JP3194967B2 (ja) | 2001-08-06 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8221590B2 (en) | Headbox for a machine for producing a fibrous web | |
US8308909B2 (en) | Sheet forming system for a machine for producing a multilayer fibrous web | |
US8236137B2 (en) | Headbox for a machine for producing a fibrous web | |
EP0158584B1 (fr) | Elément traînant pour caisse de tête | |
US5609726A (en) | Headbox and method for producing multilayer and multi-ply paper webs | |
US5958189A (en) | Wet part of a paper making machine | |
EP0939842B2 (fr) | Caisse de tete multicouche destinee a une machine de fabrication de papier | |
EP0147350A2 (fr) | Elément traînant pour chambre de règle convergent | |
FI121888B (fi) | Menetelmä kuiturainan ominaisuuksien optimoimiseksi | |
DE102010030707A1 (de) | Blattbildungssystem für eine Maschine zur Herstellung einer zumindest einschichtigen Faserstoffbahn | |
KR100487056B1 (ko) | 제지기용다층헤드박스 | |
WO2016083171A1 (fr) | Dispositif de fabrication d'une bande de matière fibreuse | |
US6146501A (en) | Cross-machine direction stiffened dividers for a papermaking headbox | |
CA2300280C (fr) | Appareil et procede de production de turbulences de pate dans une section de mise en feuille a table plate | |
FI116300B (fi) | Menetelmä sakeamassarainauksessa paperi- tai kartonkikoneella sekä vastaava paperi- tai kartonkikoneen sakeamassarainain | |
DE10141513A1 (de) | Verfahren und Vorrichtung zur Herstellung einer Faserstoffbahn aus mindestens einer Faserstoffsuspension | |
FI122113B (fi) | Menetelmä ja perälaatikko kuiturainan poikkisuuntaisen ominaisuusprofiilin parantamiseksi | |
DE202004021817U1 (de) | Blattbildungssystem | |
DE102004051255A1 (de) | Blattbildungssystem | |
JPS5844800B2 (ja) | 多層ウエブを形成する方法 | |
Norman | 10 Web Forming | |
EP1683913A1 (fr) | Section de formage à deux toiles | |
DE10355687A1 (de) | Verfahren zur Herstellung einer Faserstoffbahn | |
DE10256510A1 (de) | Stoffauflauf einer Papier- oder Kartonmaschine zur Herstellung einer Faserstoffbahn | |
DE10259606A1 (de) | Verfahren zur Herstellung einer Faserstoffbahn |
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 |
|
17P | Request for examination filed |
Effective date: 19981214 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT DE FI FR GB IT SE |
|
17Q | First examination report despatched |
Effective date: 20010803 |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: METSO PAPER KARLSTAD AKTIEBOLAG |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: TOERNEFALK-SVANQVIST, LOUISE, M. Inventor name: KLERELID, INGVAR, B., E. Inventor name: LINDEN, ANDERS, T. Inventor name: HARALDSSON, N., ULF, A. |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: TOERNEFALK-SVANQVIST, LOUISE, M. Inventor name: KLERELID, INGVAR, B., E. Inventor name: LINDEN, ANDERS, T. Inventor name: HARALDSSON, N., ULF, A. |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT DE FI FR GB IT SE |
|
REF | Corresponds to: |
Ref document number: 223534 Country of ref document: AT Date of ref document: 20020915 Kind code of ref document: T |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D |
|
REF | Corresponds to: |
Ref document number: 69715236 Country of ref document: DE Date of ref document: 20021010 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20021204 |
|
ET | Fr: translation filed | ||
PLBQ | Unpublished change to opponent data |
Free format text: ORIGINAL CODE: EPIDOS OPPO |
|
PLBI | Opposition filed |
Free format text: ORIGINAL CODE: 0009260 |
|
PLAX | Notice of opposition and request to file observation + time limit sent |
Free format text: ORIGINAL CODE: EPIDOSNOBS2 |
|
26 | Opposition filed |
Opponent name: VOITH PAPER PATENT GMBH Effective date: 20030604 |
|
PLAX | Notice of opposition and request to file observation + time limit sent |
Free format text: ORIGINAL CODE: EPIDOSNOBS2 |
|
PLBB | Reply of patent proprietor to notice(s) of opposition received |
Free format text: ORIGINAL CODE: EPIDOSNOBS3 |
|
PUAH | Patent maintained in amended form |
Free format text: ORIGINAL CODE: 0009272 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: PATENT MAINTAINED AS AMENDED |
|
27A | Patent maintained in amended form |
Effective date: 20060628 |
|
AK | Designated contracting states |
Kind code of ref document: B2 Designated state(s): AT DE FI FR GB IT SE |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: TP Owner name: METSO PAPER SWEDEN AKTIEBOLAG, SE Effective date: 20130404 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: 732E Free format text: REGISTERED BETWEEN 20130509 AND 20130515 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R082 Ref document number: 69715236 Country of ref document: DE Representative=s name: LORENZ & KOLLEGEN PATENTANWAELTE PARTNERSCHAFT, DE |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R082 Ref document number: 69715236 Country of ref document: DE Representative=s name: TBK, DE Effective date: 20130709 Ref country code: DE Ref legal event code: R082 Ref document number: 69715236 Country of ref document: DE Representative=s name: TBK, DE Effective date: 20130828 Ref country code: DE Ref legal event code: R081 Ref document number: 69715236 Country of ref document: DE Owner name: VALMET AB, SE Free format text: FORMER OWNER: METSO PAPER KARLSTAD AB, KARLSTAD, SE Effective date: 20130709 Ref country code: DE Ref legal event code: R081 Ref document number: 69715236 Country of ref document: DE Owner name: METSO PAPER SWEDEN AB, SE Free format text: FORMER OWNER: METSO PAPER KARLSTAD AB, KARLSTAD, SE Effective date: 20130709 |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: PC Ref document number: 223534 Country of ref document: AT Kind code of ref document: T Owner name: METSO PAPER SWEDEN AKTIEBOLAG, SE Effective date: 20130918 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R082 Ref document number: 69715236 Country of ref document: DE Representative=s name: TBK, DE Effective date: 20140102 Ref country code: DE Ref legal event code: R081 Ref document number: 69715236 Country of ref document: DE Owner name: VALMET AB, SE Free format text: FORMER OWNER: METSO PAPER SWEDEN AB, KARLSTAD, SE Effective date: 20140102 Ref country code: DE Ref legal event code: R081 Ref document number: 69715236 Country of ref document: DE Owner name: METSO PAPER SWEDEN AB, SE Free format text: FORMER OWNER: METSO PAPER SWEDEN AB, KARLSTAD, SE Effective date: 20140102 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R082 Ref document number: 69715236 Country of ref document: DE Representative=s name: TBK, DE |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: CD Owner name: VALMET AKTIEBOLAG, SE Effective date: 20140305 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R082 Ref document number: 69715236 Country of ref document: DE Representative=s name: TBK, DE Effective date: 20140317 Ref country code: DE Ref legal event code: R081 Ref document number: 69715236 Country of ref document: DE Owner name: VALMET AB, SE Free format text: FORMER OWNER: METSO PAPER SWEDEN AB, SUNDSVALL, SE Effective date: 20140317 |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: HC Ref document number: 223534 Country of ref document: AT Kind code of ref document: T Owner name: VALMET AKTIEBOLAG, SE Effective date: 20140612 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 20 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20160519 Year of fee payment: 20 Ref country code: GB Payment date: 20160520 Year of fee payment: 20 Ref country code: FI Payment date: 20160518 Year of fee payment: 20 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: AT Payment date: 20160518 Year of fee payment: 20 Ref country code: IT Payment date: 20160524 Year of fee payment: 20 Ref country code: FR Payment date: 20160530 Year of fee payment: 20 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R071 Ref document number: 69715236 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: PE20 Expiry date: 20170528 |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: MK07 Ref document number: 223534 Country of ref document: AT Kind code of ref document: T Effective date: 20170529 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION Effective date: 20170528 |