EP3853411A1 - Verfahren zur herstellung eines mantels für eine breitstreckwalze, verwendung des mantels für eine breitstreckwalze und breitstreckwalze - Google Patents
Verfahren zur herstellung eines mantels für eine breitstreckwalze, verwendung des mantels für eine breitstreckwalze und breitstreckwalzeInfo
- Publication number
- EP3853411A1 EP3853411A1 EP19739579.1A EP19739579A EP3853411A1 EP 3853411 A1 EP3853411 A1 EP 3853411A1 EP 19739579 A EP19739579 A EP 19739579A EP 3853411 A1 EP3853411 A1 EP 3853411A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- jacket
- polymer
- casting
- polymer layer
- diisocyanate
- 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.)
- Granted
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
- D21F1/36—Guiding mechanisms
- D21F1/40—Rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H23/00—Registering, tensioning, smoothing or guiding webs
- B65H23/02—Registering, tensioning, smoothing or guiding webs transversely
- B65H23/022—Registering, tensioning, smoothing or guiding webs transversely by tentering devices
- B65H23/025—Registering, tensioning, smoothing or guiding webs transversely by tentering devices by rollers
- B65H23/0251—Registering, tensioning, smoothing or guiding webs transversely by tentering devices by rollers with a straight axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/18—Rollers composed of several layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/50—Surface of the elements in contact with the forwarded or guided material
- B65H2404/53—Surface of the elements in contact with the forwarded or guided material with particular mechanical, physical properties
- B65H2404/532—Surface of the elements in contact with the forwarded or guided material with particular mechanical, physical properties with particular durometer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2801/00—Application field
- B65H2801/84—Paper-making machines
Definitions
- the present invention relates to a method for producing a jacket for a spreader roll, such a spreader roll and the use of such, in detail according to the independent claims.
- Spreader rolls are used in machines for producing and / or treating a fibrous web.
- spreader rollers come e.g. for paper production, on the one hand, at least indirectly in contact with the finished paper web, for example in coating units in which the paper web is coated or in the winding area in which the finished paper web is wound into reels.
- spreader rolls can also come into contact with clothing of the machine, such as forming fabrics, at least indirectly in the area of the forming section.
- such spreading rollers are subject to high friction and therefore abrasion during operation of the machine due to the contact.
- the forming section in addition to the high friction, there is the damp environment due to the fiber suspension.
- a generic spreader roll has a plurality of on one
- Cylindrical outer bushes also called segments
- the outer bushings are spaced apart from one another, preferably at the same distance, from one another. They are stored independently of one another on the roller core.
- a single, coherent jacket is drawn over the outer cylindrical jacket surfaces of the individual outer bushings. It is the jacket which, as described above, comes into contact with a paper web when the spreader roller is used as intended.
- the paper web or the covering wraps around the spreader roller, at least partially, seen in the circumferential direction thereof.
- spreader rolls are known, which are designed banana-shaped, ie with a roll core bent perpendicular to the longitudinal axis of the roll. The coat follows then essentially the outer contour of the roll core, so it also runs curved.
- the object of the invention is therefore to provide a jacket for a spreader roll and precisely one which avoids the disadvantages known from the prior art.
- detachments of the individual layers of multilayer spreader rolls are to be reduced and the service life of such spreader roll is to be increased.
- the manufacturing effort of such a jacket should also be reduced.
- the inventors have recognized that the service life of the jacket can be considerably improved by the production method according to the invention. This is achieved in that the two polymer layers of the jacket are produced simultaneously, that is to say in one stroke. The movement of the casting nozzles from one axial end to the other axial end - along the axis of rotation of the casing to be produced - is seen as the stroke. This corresponds to the concept of the operation according to the invention. This means that the jacket is finished in just one movement of the pouring nozzles. The polymers which emerge from the two casting nozzles and form the two polymer layers of the jacket after crosslinking are poured "wet-on-wet" one above the other during the casting process according to the invention.
- This term means that the first, radially inner polymer layer is not yet completely crosslinked - but is still "sticky", since the second, radially outer polymer layer is already applied to it.
- the reinforcement structure is also seen in terms of time after the application of the first, but before or at the moment of the application of the second polymer layer to the first polymer layer on the latter, at least in the latter to embed the first polymer layer.
- This method results in a monolithically produced jacket, the polymer layers and reinforcing structure of which have improved adhesion, so that detachments as a result of the load are reduced during normal operation.
- the simplified manufacturing process also saves manufacturing time.
- successive application is to be understood to mean the application of a polymer gradually, that is to say piecewise over the entire outer diameter of the casting cylinder or the second polymer layer.
- polymer is applied from the two casting nozzles.
- the mouth cross section of the pouring nozzles for polymer is only a fraction of the circumferential surface of the shell to be produced. Therefore, in accordance with the rotational molding process, one polymer strip is placed in a spiral on the casting cylinder or the second polymer layer until the entire circumferential surface of the jacket is finished in this way.
- the steps of the method according to the invention take place simultaneously with one another in one work step, it means that these steps at the same time, but on a different section of the outer circumference of the jacket or casting cylinder to be produced or of the first polymer layer, that is, only locally offset, ie by the distance between the two pouring nozzles.
- the distance between the pouring nozzles can be a multiple of the width of the mouth of the nozzles, ie the width of the polymer strip that can be brought out of these.
- Spreader roll in the sense of the invention means the spreader roll of the generic type mentioned at the outset.
- a fibrous web in the sense of the invention is a scrim of fibers such as wood fibers, plastic fibers, glass fibers, carbon fibers, To understand additives, additives or the like.
- the fibrous web can be designed as a paper, cardboard or tissue web. It can essentially comprise wood fibers, whereby small amounts of other fibers or also additives can be present. Depending on the application, this is left to the specialist.
- a sheath in the sense of the invention means a band which is closed in the circumferential direction about its longitudinal axis - in the manner of a loop.
- the jacket is open at its axial ends, as seen in the width direction along the longitudinal axis.
- the jacket can thus be pulled over one of its axial ends over a roller core (or its segments) of the spreader roller.
- the inner surface (radially innermost outer surface) of the casing then lies at least indirectly on the (radially outermost) outer surface of the segments.
- the alternatives include indirect (through other means) and direct (direct).
- the jacket can be made partially or entirely of a polymer.
- a castable, curable, preferably elastomeric polymer, also called cast elastomer, such as polyurethane can be used as the polymer.
- polymer layer is meant a layer which comprises such a castable, curable, preferably elastomeric polymer or is produced entirely therefrom.
- the two polymer layers are one-piece, hardened layers produced by master molding. In other words, they are monolithically shaped, i.e. made by casting.
- the polymer layers of the two polymer layers can be identical. If exactly two polymer layers are provided, the radially inner (or innermost) polymer layer — measured in the radial direction around the longitudinal axis of the jacket — can have a thickness of approximately 5 mm. The radially outer (or outermost) polymer layer can have a corresponding thickness of approximately 10 to 20 mm exhibit.
- the term, for example, means a deviation of up to +/- 20% of the stated value.
- line structure is a line structure such as. B. thread or thread understood.
- thread is meant a linear, long and thin structure made of one or more fibers.
- Thread is understood to mean a linear structure which is produced from several twisted threads.
- the line structure can be made from several fibers twisted around one another in the manner of a rope.
- the definitions mentioned are used regardless of the material used and the thickness. This means that e.g. a comparatively thick metallic thread is called thread and not, as is customary in the art, called wire.
- sheet-like - preferably textile - such as. B. fabrics, knitted fabrics, knitted fabrics, braids or scrims - which are made of linear structures.
- the fabric can be a band. Again, the definitions mentioned are used regardless of the material and thickness used.
- the reinforcement structure is made from a starting material.
- the starting material is understood to mean that material or sheet material by means of which the reinforcing structure of the finished jacket according to the invention is produced.
- the starting material that is to say raw material
- the length is preferably dimensioned such that the (single) reinforcing structure can be produced continuously in one stroke - without interruption - over the entire width of the jacket.
- the starting material can, for example, be in the form of - preferably in the form of a roll - and can be unwound lengthwise from a roll.
- a finished jacket in the sense of the invention is one whose two polymer layers have been hardened and finally processed, that is to say ready for use for the purpose mentioned at the outset, for example for mounting on the spreader roll or for paper production.
- a finished polymer layer means a layer that has hardened.
- reinforcing structure in the sense of the invention means reinforcing the at least one layer containing or consisting of the polymer - that is to say the polymer layer.
- the reinforcing structure can be completely embedded in the polymer layer, so that the reinforcing structure does not go beyond the boundary of the polymer layer.
- the polymer layer takes on the role of a matrix, which surrounds the reinforcement structure and binds to the matrix as a result of adhesive or cohesive forces.
- single reinforcement structure means that the line and / or flat structure is the only reinforcement - the at least one polymer layer, all the polymer layers and preferably the entire finished jacket itself.
- the at least one polymer layer, all polymer layers and preferably the entire jacket are free of further (additional) reinforcement structures, such as line structures and / or flat structures and preferably free of scrims.
- additional reinforcement structures such as line structures and / or flat structures and preferably free of scrims.
- the term “scrim” is understood to mean a flat structure consisting of one or more layers of parallel threads that are not fixed in a material, frictional or form-fitting manner at their crossing points. Such a clutch is not sustainable itself after it has been laid, which means that if it is relocated it loses its shape.
- a fabric or fabric tape is understood to be a textile fabric woven from warp and weft threads. Warp and weft threads cross each other.
- the fabric can comprise a single or several different, preferably several thread systems with different mechanical properties. But it is also conceivable to use fabrics in which the threads of warp and weft are made of the same material.
- the present invention also relates to a machine mentioned at the outset or its components, such as a winding device, a forming section or a coating unit, in which the component according to the invention, that is to say the jacket and / or the spreader roller, is / are installed.
- a machine mentioned at the outset or its components such as a winding device, a forming section or a coating unit, in which the component according to the invention, that is to say the jacket and / or the spreader roller, is / are installed.
- FIG. 1 shows a highly schematic, partially sectioned view of an spreader roller according to the invention
- Fig. 2 is a schematic partial and enlarged partial view of a
- 3a, 3b two very simplified representations of the devices for producing the jacket.
- a spreader roller 7 according to the invention is shown in a highly schematic, partially sectioned view. This representation is not to scale.
- the spreader roll 7 has a curved roll core 7.2.
- the curvature is exaggerated.
- the roller core 7.2 follows the curvature of its roller axis 7.1.
- the latter is concentric to the roller core 7.2 and, in the selected view, is curved around a perpendicular to the plane of the drawing.
- the spreader roller 7 can be designed in such a way that it can be bent, that is, when used as intended, it can be brought into a curved and an uncurved position.
- a plurality of cylindrical outer bushes 7.3 are arranged on the roller core 7.2.
- the outer bushes 7.3 are preferably arranged without contact with one another at a distance along the roller axis 7.1 from one another. They can preferably be arranged evenly distributed over the roller core 7.2.
- the term evenly distributed refers to the smallest distance between the symmetry points (intersection of the respective axis of symmetry with the roller axis 7.1) of the outer bushes 7.3 which are directly adjacent to one another. In the curved position of the spreader roller 7 shown cut the
- the outer bushes 7.3 are mounted independently of one another on the roller core 7.2 so as to be rotatable about their longitudinal axis, which can coincide in sections (eg tangentially) with the roller axis 7.1.
- Mounted rotatably means that a rotation of the outer bushes 7.3 relative to the roller core 7.2 is possible, particularly when the spreader roller 7 is used as intended.
- the outer bushes 7.3 are preferably not designed to be displaceable in the axial direction, that is to say in the direction of the roller axis 7.1, at least not when the spreader roller 7 is used as intended. In the present view, five outer bushes 7.3 are shown by way of example. A different number would of course be conceivable.
- a bearing can be provided at the axial ends of the roller core 7.2 in order to absorb the forces acting on the spreader roller 7 during operation.
- This storage can be a fixed or rotating bearing.
- the spreader roller 7 and in particular the roller core 7.2 can be driven in rotation, that is, in relation to a stationary part such as the frame of a machine in which it is installed, or it can be rigid, that is to say it can be non-rotating in relation to this stationary part.
- a single, coherent jacket 1 is drawn over the radially outer cylinder jacket surfaces of the individual outer bushes 7.3. It extends at least from one axial end of the first outer bushing 7.3 (or beyond it) to an axial end of the last outer bushing 7.3 opposite this and beyond.
- Such a jacket 1 is shown by way of example in FIG. 2.
- the figure shows a cross-section through the longitudinal axis 1.1 of the finished jacket 1, which is not to scale and is partially shown, a possible embodiment of the invention.
- a comparison of FIGS. 1 and 2 shows that the longitudinal axis of the finished jacket 1 does not initially correspond to the curved roller axis 7.1 of the spreader roller 7 shown. However, since the jacket 1 is elastic, it follows the curvature of the roller axis 7.1 of the spreader roller 7 after being pulled onto the roller core 7.2.
- the jacket 1 comprises exactly two polymer layers 2 and 2.1. The latter are arranged one above the other in the radial direction with respect to the longitudinal axis 1.1 of the casing 1.
- a reinforcing structure 3 is embedded in the first, radially inner polymer layer 2.
- the reinforcement structure 3 is designed as a line structure, such as a metallic thread or in the manner of a rope.
- the coiled spirals of the line structure are shown here in simplified form as hatched circles. Coils which are adjacent to one another are equally spaced from one another over the entire length of the casing 1, namely by the pitch S.
- a second polymer layer 2.1 is applied to the outer circumference of the first polymer layer 2.
- the first, radially inner polymer layer 2 has the reinforcing structure 3, the radially outer polymer layer 2.1 being free of such in the case shown.
- the reinforcement structure 3 can also be arranged in both polymer layers 2, 2.1 at the same time or only in the second polymer layer 2.1. In principle, it would be conceivable to provide more than two polymer layers 2, 2.1.
- the reinforcement structure 3 can in principle be the line structure shown and / or a flat structure not shown as. Regardless of the embodiment shown, the aforementioned and / or link means that both a line and a flat structure can be present in the same polymer layer.
- 3a and 3b show two different devices for producing the jacket 1 according to the invention in a highly schematic, not to scale representation. Only part of a casting cylinder 4 is shown. The illustration shows an initial stage of the manufacturing process of the jacket 1.
- the casting cylinder 4 is mounted rotatably about its longitudinal axis 5, which corresponds to the longitudinal axis 1.1 of the jacket 1 to be produced. Longitudinal axis 5 runs here in the plane of the drawing.
- molding material such as pourable, curable elastomeric polymer, e.g. Polyurethane, from above through a first pouring nozzle 8 onto the radially outermost lateral surface of the casting cylinder 4.
- a casting material can e.g. should be chosen with regard to its pot life and viscosity such that it does not drip off the casting cylinder 4 during casting.
- the casting cylinder 4 is rotated in the direction of the arrow about its longitudinal axis 5.
- the first casting nozzle 8 is over a suitable guide, not shown in FIGS. 3a, 3b, parallel to the longitudinal axis 5 along this relatively along the casting cylinder 4.
- the polymer strip emerging from the first pouring nozzle 8 gradually solidifies and successively forms the first polymer layer 2.
- the starting material 3.1 is unrolled and wound into coils on the rotating casting cylinder 4 in order to produce the reinforcing structure 3.
- the starting material 3.1 is in the first polymer layer 2 e.g. fully embedded.
- the second, radially outer polymer layer 2.1 is poured onto the outer circumference of the first polymer layer 2.
- a second casting nozzle 9 is provided for this purpose. This is essentially identical to the first pouring nozzle 8. However, both pouring nozzles 8, 9 are arranged spaced apart from one another along the longitudinal axis 5 of the pouring cylinder 4. The distance is a multiple of the width of the mouth of the pouring nozzles 8, 9. Between the two pouring nozzles 8, 9, the starting material 3.1 is then unwound and e.g. embedded in the first polymer layer 2.
- the casting material emerging from the casting nozzles 8, 9 is in the present case a mixture of a prepolymer and a crosslinking agent.
- the mixture is mixed in a mixing head 7, 7.1 from the two aforementioned components.
- the prepolymer is provided from a prepolymer container, not shown, in which it is stored or stirred.
- the prepolymer is the reaction product of an isocyanate according to the invention and a polyol.
- the prepolymer container for example, it can be in the form of a prepolymer from the substances just mentioned.
- the crosslinker can be provided in a crosslinker container, also not shown.
- the prepolymer container and crosslinker container are assigned to the device for producing the jacket 1. They are connected in a flow-conducting manner to mixing heads 7, 7.1 via lines, also not shown.
- the prepolymer-crosslinking agent mixture is thus produced upstream and outside the corresponding casting nozzle 8, 9 in the mixing head 7, 7.1, that is to say mixed, in order then to be applied as a polymer strip from the casting nozzle 8, 9.
- two separate mixing heads 7, 7.1 are provided according to FIG. 3b, which are connected to separate prepolymer containers and crosslinker containers via separate lines.
- both polymer layers 2, 2.1 are to be made from the same polymer, all that is required is a mixing head 7 which distributes the prepolymer / crosslinker mixture to both casting nozzles 8, 9 via a distributor 6 (FIG. 3a).
- the distributor 6 can be designed such that material flows which differ from one another can be delivered to the pouring nozzles 8, 9. In this way, the thickness of the individual polymer layers 2, 2.1 can be easily and separately adjusted.
- an endless cylindrical tubular jacket 1 whose inner circumference essentially corresponds to the outer circumference of the casting cylinder 4, is gradually produced over the width of the casting cylinder 4.
- the polymer to be discharged from the pouring nozzles 8, 9 can be selected, for example with regard to its pot life, in such a way that the polymer layers 2, 2.1 can still be applied to one another “wet-on-wet”.
- Reinforcement structure 3 is particularly well anchored in this. All in all, this can improve the detachment behavior of the individual polymer layers 2, 2.1 from one another and simplify the manufacturing process of such a jacket 1.
Landscapes
- Laminated Bodies (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018122778.7A DE102018122778A1 (de) | 2018-09-18 | 2018-09-18 | Verfahren zur Herstellung eines Mantels für eine Breitstreckwalze, Breitstreckwalze sowie Verwendung einer solchen |
| PCT/EP2019/068636 WO2020057797A1 (de) | 2018-09-18 | 2019-07-11 | Verfahren zur herstellung eines mantels für eine breitstreckwalze, verwendung des mantels für eine breitstreckwalze und breitstreckwalze |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3853411A1 true EP3853411A1 (de) | 2021-07-28 |
| EP3853411B1 EP3853411B1 (de) | 2025-12-31 |
Family
ID=67262313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19739579.1A Active EP3853411B1 (de) | 2018-09-18 | 2019-07-11 | Verfahren zur herstellung eines mantels für eine breitstreckwalze, verwendung des mantels für eine breitstreckwalze und breitstreckwalze |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3853411B1 (de) |
| DE (1) | DE102018122778A1 (de) |
| FI (1) | FI3853411T3 (de) |
| WO (1) | WO2020057797A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102022118390A1 (de) * | 2022-07-22 | 2024-01-25 | Manroland Goss Web Systems Gmbh | Additiv gefertigte Leitwalze |
| DE202023101328U1 (de) | 2023-03-17 | 2023-03-24 | Voith Patent GmbH | Vorrichtung und Maschine |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3715153A1 (de) * | 1987-05-07 | 1988-12-01 | Voith Gmbh J M | Verstaerkter pressmantel fuer eine presseinrichtung zur behandlung bahnfoermigen gutes, wie z. b. von papierbahnen, sowie verfahren und vorrichtung zu seiner herstellung |
| DE4022800C1 (de) * | 1990-07-18 | 1991-09-19 | J.M. Voith Gmbh, 7920 Heidenheim, De | |
| DE4411620C2 (de) * | 1994-04-02 | 2001-05-31 | Voith Sulzer Papiermasch Gmbh | Preßmantel und Verfahren zur Herstellung eines Preßmantels |
| US7014733B2 (en) * | 2002-05-14 | 2006-03-21 | Stowe Woodward L.L.C. | Belt for shoe press and shoe calender and method for forming same |
| EP2841647B1 (de) * | 2012-04-27 | 2017-11-15 | Voith Patent GmbH | Presswalze mit walzenbezug aus polyurethan |
| DE102015217942A1 (de) * | 2015-09-18 | 2017-03-23 | Voith Patent Gmbh | Pressmantel und Verfahren zur Herstellung eines solchen |
| DE202016105130U1 (de) * | 2016-09-15 | 2016-10-05 | Voith Patent Gmbh | Mantel für eine Breitstreckwalze und Breitstreckwalze |
-
2018
- 2018-09-18 DE DE102018122778.7A patent/DE102018122778A1/de active Pending
-
2019
- 2019-07-11 WO PCT/EP2019/068636 patent/WO2020057797A1/de not_active Ceased
- 2019-07-11 EP EP19739579.1A patent/EP3853411B1/de active Active
- 2019-07-11 FI FIEP19739579.1T patent/FI3853411T3/fi active
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020057797A1 (de) | 2020-03-26 |
| FI3853411T3 (fi) | 2026-03-31 |
| EP3853411B1 (de) | 2025-12-31 |
| DE102018122778A1 (de) | 2020-03-19 |
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