WO2002044466A1 - Arrangement for fastening a turbulence vane to a headbox - Google Patents
Arrangement for fastening a turbulence vane to a headbox Download PDFInfo
- Publication number
- WO2002044466A1 WO2002044466A1 PCT/FI2001/001027 FI0101027W WO0244466A1 WO 2002044466 A1 WO2002044466 A1 WO 2002044466A1 FI 0101027 W FI0101027 W FI 0101027W WO 0244466 A1 WO0244466 A1 WO 0244466A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- turbulence
- headbox
- fastener
- vane
- turbulence vane
- Prior art date
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
- D21F1/028—Details of the nozzle section
-
- 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
Definitions
- the present invention relates to an arrangement for fastening a turbulence vane to a headbox, in which headbox there are openings for the stock flow formed in the plate delimiting the slice chamber, as well as at least one continuous groove running parallel to the width of the headbox and located in the area between the openings in order to fasten a turbulence vane to the said plate on the slice chamber side, while a fastener which is arranged to be placed in the said groove is fitted to the rear edge of the turbulence vane.
- turbulence vanes are used in the slice chamber after the turbulence generator in the headbox of a paper machine.
- the turbulence vanes are also termed strips or lamellae, a single slice chamber generally containing a total of one to six of them.
- the desired level of turbulence is intended to be maintained to the slice opening and as far as the wire section, so that the fibres in the stock flow will be as randomly oriented as possible when they are discharged from the headbox. This is used to affect the tensile strength of the material being manufactured and the orientation of the tensile strength in different directions in the material.
- turbulence vanes are also used to separate the different stock layers from each other, which improves the layer purity of the fibres, as well as their orientation.
- a fastener which is welded or glued to a usually plastic turbulence vane, is used to attach the turbulence vane to the plate delimiting the slice chamber.
- the turbulence vane is secured, with the aid of a fastener, to a groove machined in the plate.
- glue or weld materials of this kind such as the so-called fluoro- plastics.
- welding often causes distortions or strain in the material, which can lead to unpredictable breakages during operation.
- FI publication print number 55372 also discloses a fastener, which is glued onto the turbulence vane.
- the fastening in question is, however, unreliable and it requires a specific kind of groove in the plate.
- the same publication also discloses another fastener, which is not actually attached to the turbulence vane.
- the fastening is based on the friction that is created between the turbulence vane and protrusions on the fastener. This fastening is particularly unreliable and its manufacture and installation is difficult.
- the rotation of the turbulence vane permitted by the fastener is, in addition, extremely limited.
- the invention is intended to create an entirely new type of arrangement for fastening a turbulence vane to a headbox, by means of which arrangement a turbulence vane can be fastened to a headbox more easily and also more securely than previously.
- special fasteners are used, by means of which gluing and welding are avoided.
- gluing and welding are avoided.
- the fastener can be manufactured from a different material than the turbulence vane.
- the fasteners can also be manufactured in several different ways and they permit thermal expansion in adjacent structures.
- the fastener also forms a hinge member, which permits the turbulence vane to turn freely.
- the fastener according to the invention is suitable for use directly in the existing conventional grooves in a headbox.
- Figure 1 shows a part of the headbox of a paper machine in cross-section and equipped with an arrangement according to the invention
- Figure 2 shows the fastener used in the arrangement according to the invention, attached to a turbulence vane
- Figure 3a shows a cross-section of the arrangement according to the invention
- Figure 3b shows a second embodiment of the fastener used in the arrangement according to the invention and an axonometric view of part of a turbulence vane.
- FIG 1 shows part of a paper or board machine headbox that is, as such, conventional.
- the watery stock used in the manufacturing process is fed through a turbulence generator 10 into a slice chamber 11.
- the turbulence generator 10 is formed of several tubes 12, which are supported at both ends on sturdy plates 13 and 14. Openings 15, into which the said tubes 12 are set, are machined in the plate delimiting the slice chamber 11.
- the tubes 12 are in seven rows on top of each other, which extend over the entire width of the headbox.
- the tubes 12 are set at a certain angle to each other, so that the flows discharging from the tubes of the various rows will combine in the slice opening 17.
- Figure 1 does not, however, show the stock or its flows.
- the slice chamber 11 after the turbulence generator 10, there are turbulence vanes 16, by means of which the desired level of turbulence is maintained to the slice opening 17 and at least as far as the wire section. From the turbulence opening 17, the stock discharges at this point onto the wire carried by the roller T and is carried forward by it.
- turbulence vanes 16 there are six turbulence vanes 16, each of which is fastened to the headbox in the manner according to the invention.
- fastener 18 or 18' at the end of the turbulence vane 16 and a groove 19 in the plate 14 delimiting the slice chamber 11.
- the groove 19 located in the area between the openings 15 runs in the direction of the width of the headbox and is continuous.
- a fastening retainer 20 is formed in the base material of the turbulence vane 16, to which the said fastener 18 or 18' is fitted.
- the fasting retainer is thus part of the turbulence vane.
- the fastener 18 or 18' there is also a construction arranged to lock onto the fastening retainer 20.
- the fastener 18 or 18' forms a hinge member that permits the rotation of the turbulence vane.
- the arrangement in question is easy to manufacture and creates a reliable fastening of the turbulence vane to the plate.
- the manufacturing of the arrangement avoids welding, gluing, and other forms of joining. This makes it possible to use durable materials, that are, however, difficult to joint using the prior art.
- the description will examine the arrangement according to the invention in the case of a single turbulence vane. Nevertheless, the characteristics described apply to all turbulence vanes.
- the fasteners permits the thermal expansion of the structures.
- the fasteners are arranged to fit entirely into the groove, thus forming the said hinge member.
- the turbulence vane can turn according to the stock flow, without detrimental strain.
- the arrangement has no effect on the stock flow and the dirtying of the structures is minimal.
- the groove 19 is preferably a dovetail groove, which is commonly used headboxes nowadays .
- FIG. 2 shows one turbulence vane 16 applied in the arrangement according to the invention and a fastener 18 fitted to it.
- the fastening retainer 20 is formed by drill holes 21 machined in the turbulence vane 16, which are arranged in a row parallel to the width of the headbox.
- the drill holes 21 are preferably manufactured mechanically in large series using several drill bits, such as, for example, are used in drilling the mantles of vacuum rolls.
- the drill holes 21, the diameter of which is 2 - 6 mm, preferably 3 - 4 mm, are machined at a distance of 3 - 25 mm, preferably 5 - 15 mm from the rear edge of the turbulence vane 16.
- the drill holes 21 are arranged at 5 - 30 mm, preferably 1 - 15 mm intervals across the width of the headbox.
- the drill holes have an advantageously small effect on the strength of the turbulence vane.
- the row of drill holes can be made to deviate from the line of the rear edge of the turbulence vane, in which case desired compensation forces can be created in the turbulence vane.
- the term drill hole generally refers to an opening, into which the fastener can be placed. Besides drilling, some other suitable manner of machining can be used. Besides a circular drill hole, some other shape of opening can also be used, though a circular drill hole is preferable in terms of the durability of the turbulence vane.
- One preferred fastener 18 is a coil spring 22, which is fitted into the drill holes 21 forming the fastening retainer 20.
- the coils of the coil spring 22 form the said structure locking onto the fastening retainer 20 ( Figure 2) .
- the pitch of the coil spring of acid-resistant steel is the distance between the drill holes or a multiple of the distance.
- a preferably accurately dimensioned coil spring can be installed successfully even in a wide turbulence vane, by simply rotating the coil spring.
- the thickness of the material of the coil spring is slightly less than the diameter of the drill hole used, so that installation can be carried out as described.
- FIG. 3a shows an arrangement according to the invention, based on a coil spring 22, ready for use.
- the arrangement described above is simple to manufacture and is durable.
- the coils of the coil spring form several attachment points in the groove, so that the friction forces are small. This makes the turbulence vane easy to move.
- the coil spring gives way due to its structure. Thus, the turbulence vane remains unstressed.
- large gaps remain between the coil spring and the groove, so that it is unlikely that fine material will collect in the groove.
- Figure 3b shows part of another arrangement according to the invention.
- the fastening retainer 20 is formed by grooves 23 and 23' machined in the rear part of the turbulence vane 16.
- the grooves are continuous and extend over the whole distance of the turbulence vane 16.
- the grooves can be the length of the fasteners used, so that the strength of the turbulence vane is reduced as little as possible by the grooves.
- the groove 23 and 23' or similar is machined at a distance of 5 - 25 mm, preferably 10 - 20 mm, from the rear edge of the turbulence vane.
- a sufficient support surface is achieved for the fastener, while still allowing the fastener to fit into the groove.
- the same reference numbers are used for components that are functionally similar.
- fasteners can be attached to the grooves 23 and 23' machined in the turbulence vane 16.
- the cross-section of the fastener 18' according to Figure 3b is, however, essentially circular. This makes it easy to create a hinge member permitting the turbulence vane to turn.
- the fastener is preferably manufactured from a plastic material, so that extrusion, for instance, can be used as the manufacturing method.
- a throat 24 is formed in the fastener 18' of Figure 3b, in which protrusions 25 and 25' are formed to create a construction that locks onto the fastening retainer 20.
- the shape shown can be manufactured using, among other methods, the said extrusion.
- the fastener 18' can be installed in the grooves 23 and 23' from the ends of the turbulence vane 16, but, by suitably dimensioning the fastener 18', resilient properties can be created in it ( Figure 3b) .
- the fastener 18' can be simple pushed in the direction of the turbulence vane 16, so that the fastener 18' locks onto the rear edge of the turbulence vane 16.
- the fasteners 18 ' described in the previous paragraph are prefera- bly manufactured as short pieces.
- the length of the fastener in the direction of the width of the headbox is 50 - 350 mm, preferably 100 - 250 mm.
- the fasteners are arranged at intervals of 100 - 500 mm, preferably 200 - 400 mm.
- a few standard-size fasteners will, however, achieve a suffi- ciently reliable attachment of the turbulence vane.
- fasteners that are set apart from each other will permit thermal expansion in the turbulence vane.
- the fastener By suitably shaping protrusions in a one-piece fastener, the fastener can also be attached in drill holes. Thus, grooves need not be machined in the turbulence vane, the thickness of which is generally 3 - 6 mm. Thanks to the arrangement according to the invention, materials that were previously regarded as impossible can be used to manufacture turbulence vanes.
- One preferred material for use in an embodiment is PVDF plastic, one trade name for which is Kynar. This plastic will resist even very high temperatures and a variety of chemicals. These properties are significant when washing headboxes, when hot water and various cleaning agents are used. Thus, the turbulen- ce vanes can even remain in place when the headbox is washed, whereas at present they must be removed.
- the arrangement is also easy to apply, as it suits present headboxes without alterations .
Landscapes
- Connection Of Plates (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2002223037A AU2002223037A1 (en) | 2000-11-29 | 2001-11-27 | Arrangement for fastening a turbulence vane to a headbox |
DE10196929T DE10196929T1 (en) | 2000-11-29 | 2001-11-27 | Arrangement for attaching a turbulence wing to a headbox |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI20002616 | 2000-11-29 | ||
FI20002616A FI115230B (en) | 2000-11-29 | 2000-11-29 | Turbulence vane fastening arrangement for headbox of paper machine, involves arranging fastening retainer to the base of turbulence vane to which fastener is fitted |
US31367701P | 2001-08-20 | 2001-08-20 | |
US60/313,677 | 2001-08-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002044466A1 true WO2002044466A1 (en) | 2002-06-06 |
Family
ID=26161089
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FI2001/001027 WO2002044466A1 (en) | 2000-11-29 | 2001-11-27 | Arrangement for fastening a turbulence vane to a headbox |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU2002223037A1 (en) |
DE (1) | DE10196929T1 (en) |
WO (1) | WO2002044466A1 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4133715A (en) * | 1977-03-29 | 1979-01-09 | Beloit Corporation | Headbox and holders for floating slice chamber dividers |
-
2001
- 2001-11-27 WO PCT/FI2001/001027 patent/WO2002044466A1/en not_active Application Discontinuation
- 2001-11-27 DE DE10196929T patent/DE10196929T1/en not_active Withdrawn
- 2001-11-27 AU AU2002223037A patent/AU2002223037A1/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4133715A (en) * | 1977-03-29 | 1979-01-09 | Beloit Corporation | Headbox and holders for floating slice chamber dividers |
Also Published As
Publication number | Publication date |
---|---|
DE10196929T1 (en) | 2003-10-16 |
AU2002223037A1 (en) | 2002-06-11 |
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