EP3830334A1 - Pressmantel, dessen verwendung sowie presswalze und schuhpresse - Google Patents
Pressmantel, dessen verwendung sowie presswalze und schuhpresseInfo
- Publication number
- EP3830334A1 EP3830334A1 EP19730354.8A EP19730354A EP3830334A1 EP 3830334 A1 EP3830334 A1 EP 3830334A1 EP 19730354 A EP19730354 A EP 19730354A EP 3830334 A1 EP3830334 A1 EP 3830334A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- press
- jacket
- thread
- polymer layer
- threads
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 229920000642 polymer Polymers 0.000 claims abstract description 84
- 239000000835 fiber Substances 0.000 claims abstract description 49
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 49
- 230000002787 reinforcement Effects 0.000 claims description 26
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 239000000123 paper Substances 0.000 claims description 6
- 229920002678 cellulose Polymers 0.000 claims description 3
- 239000001913 cellulose Substances 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 72
- 238000004804 winding Methods 0.000 description 13
- 238000005266 casting Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 9
- 229920002635 polyurethane Polymers 0.000 description 5
- 239000004814 polyurethane Substances 0.000 description 5
- 239000004753 textile Substances 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 239000004971 Cross linker Substances 0.000 description 3
- 238000009954 braiding Methods 0.000 description 3
- 239000003431 cross linking reagent Substances 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000009194 climbing Effects 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- -1 polyethylene naphthalate Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/0209—Wet presses with extended press nip
- D21F3/0218—Shoe presses
- D21F3/0227—Belts or sleeves therefor
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/08—Pressure rolls
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F7/00—Other details of machines for making continuous webs of paper
- D21F7/08—Felts
- D21F7/083—Multi-layer felts
Definitions
- the invention relates to a press jacket, in particular for a press device for treating a fibrous web, e.g. for smoothing or dewatering, in detail according to the independent claims.
- the invention also relates to a press roll, a shoe press and the use of a press jacket in such a one, in detail according to the independent claims.
- Press devices such as shoe presses have long been part of modern paper machines. They essentially comprise a stationary shoe (also called a press shoe), which extends in a cross-machine direction, and a press jacket that runs around the stationary shoe. The latter is deformable and essentially assumes a tubular shape during operation.
- the shoe is shaped so that it forms a press nip with a counter roller.
- the press nip is defined by the contact surface of the counter roller in the shoe.
- the shoe is designed to be movable and can be moved to the counter roller.
- Enormous demands are placed on the press jacket in terms of its stability, namely with regard to surface hardness, resistance to pressure, temperature and flydrolysis.
- the press jacket is also exposed to strong alternating bending loads during operation.
- This deformation of the press jacket when entering and leaving is also referred to as a changing nip. It is easy to see that the tendency of the press casing to break particularly at this point is very high due to the high mechanical stress. Accordingly, many measures are known from the prior art that improve the stability of the
- Press sleeve should increase.
- the press jacket must therefore be sufficiently flexible so that it can be guided around the shoe, it must be sufficiently stiff so that it does not deform or compress too much under the press load in the nip, and it must be sufficiently wear-resistant.
- Press sleeves therefore consist of a single or multi-layer polymer layer, preferably made of polyurethane, in which reinforcing threads in the form of scrims or fabrics can be embedded.
- the present invention relates to such generic items mentioned at the outset.
- Press sleeves known from the prior art tend to premature failure during normal operation as a result of an overload - often only local - in the nip. This occurs when a foreign body passes through the nip during a so-called batz passage. Such an overload often leads to the reinforcement threads or the polymer layer in which they are embedded tearing. A press jacket that is oil-lubricated from the inside can leak, so that the oil comes into contact with the fibrous web to be produced. As a result, the press jacket must be replaced. In practice, this leads to unplanned downtimes of the pressing device and thus to increased, costly downtimes.
- the press jacket should therefore withstand such short-term overloads and thus increase its service life and reduce the downtimes of a press device equipped with such a press jacket.
- reinforcement threads are used at least as longitudinal threads, which are produced by interlacing individual fibers or fiber bundles with one another. This means that reinforcing threads are used whose fibers or fiber bundles have not been twisted.
- Reinforcing threads known from the prior art are all threads or yarns. That means they are made by twisting (twisting) several fiber bundles.
- reinforcing threads according to the invention embedded in a polymer layer
- the reinforcing threads according to the invention have a lower tendency to become less detached from the polymer layer embedding them in the course of a batch passage. This increases the service life of such a press jacket.
- the frequency of the standstill of a press device equipped with the press jacket is reduced.
- the definition that at least the longitudinal threads are produced as reinforcing threads according to the invention means that only the longitudinal threads are designed in this way or in addition the longitudinal threads and at least one further peripheral thread are produced in this way. If, for example, a layer of circumferential and longitudinal threads is preferably present, this means that at least the longitudinal threads are designed according to the invention.
- the at least one circumferential thread can then be conventionally twisted, that is to say the fiber bundles of a reinforcement thread designed as a circumferential thread are twisted with one another, that is to say they are free of interweaving with one another.
- a press jacket in the sense of the invention is to be understood as a band, hose or a jacket which, as shown, is guided together with a fibrous web through the press nip of a shoe press.
- the fibrous web can come into contact with the radially outermost surface (polymer layer) of the press jacket with a press felt, from which the fibrous web to be dewatered is carried directly.
- the press jacket can also come into direct contact with the fibrous web in order to smooth it, for example.
- the press jacket is designed as a closed jacket (hose) which is endless in the circumferential direction about its longitudinal axis. At its axial ends it is open - as seen in the width direction (along the longitudinal axis).
- the press jacket can thus be held at these axial ends by two lateral tensioning disks in order to form the shoe press roll.
- the press jacket instead of being guided through the two lateral tensioning disks, the press jacket, as is the case with open shoe presses, can be guided over the press shoe and several guide rollers. Regardless of whether the press jacket is guided by the tensioning disks or the guide rolls, the press shoe (or the guide rolls) comes into contact with part of the radially innermost surface of the press jacket.
- the radially outermost surface of such a press casing for example the radially outermost polymer layer thereof, can be provided with grooves and / or blind bores.
- the longitudinal direction means the direction that runs parallel to the longitudinal axis of the press casing.
- the longitudinal axis also corresponds to the axis of symmetry or rotation of the finished press jacket or the press roll.
- the circumferential direction of the press casing extends around the longitudinal axis as seen around its radial boundary.
- the term parallel also includes those angular deviations of two reinforcement threads lying in different planes of +/- 5 ° to one another.
- the press jacket or the at least one polymer layer can be made partially or completely from a polymer.
- a pourable, curable, preferably elastomeric polymer such as polyurethane can be used as the polymer.
- the polymer can consequently be set as a cast elastomer.
- polymer layer is meant a layer which comprises such a castable, curable, preferably elastomeric polymer or is produced entirely therefrom.
- the polymer layer can preferably be a cured layer which is produced in one piece by primary molding. In other words, it is monolithically shaped, that is, manufactured by casting, for example.
- the term one-part also includes cases in which the one layer was again made from several layers of the same material when the polymer was cast. However, this only insofar as these layers are essentially no longer visible after curing, but rather a single, preferably uniform, layer results. The same applies accordingly to the finished press jacket.
- the press casing can be arranged one above the other as seen in the radial direction - at least in sections over the width of the press jacket. At least in sections over the width of the press casing means that the press casing, for example, has only one layer at its axial ends along the longitudinal axis of the press casing, whereas it is formed in two or more layers between the axial ends.
- the polymer layers can also extend over the entire width of the press jacket.
- the thickness of the press jacket - and thus the thickness of the individual polymer layers - can vary in sections along the longitudinal axis in a section through its longitudinal axis.
- the radially outermost polymer layer in the area of the width edges of the press jacket can be smaller than in the middle of the press jacket.
- the radially outermost polymer layer can be less thick than a radially inner or radially innermost polymer layer.
- a total thickness of the finished press jacket in a section through the longitudinal axis thereof in the radial direction can be 5 to 10 mm, preferably 5 to 7, particularly preferably 5 to 6 mm. According to the invention, if a single layer is provided, the press jacket can be produced from only one casting, ie monolithically, so that the single layer has the thickness just mentioned.
- a finished press jacket in the sense of the invention is one whose at least one polymer layer has hardened and possibly been finally processed, that is to say is ready for use in a shoe press, for example, for the aforementioned purpose.
- a finished polymer layer means a layer that has hardened.
- a reinforcing thread in the sense of the invention is understood to mean a pliable, textile line structure which has a dominant extension and a uniformity in its longitudinal direction.
- the reinforcing thread is made from a plurality, that is to say at least two fibers, or at least two fiber bundles by intertwining them.
- fiber we mean a single, endless fiber in the manner of a monofilament. If, on the other hand, one speaks of a fiber bundle in the sense of the invention, it is not a question of monofilaments, but in turn a single thread, such as a thread or yarn, that is to say a bundle of continuous fibers or monofilaments.
- the fiber bundles themselves can certainly be made from twisted fibers. It is important, however, that the reinforcing thread is finally achieved by interlacing several fiber bundles.
- 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.
- Such a reinforcement structure can textile line structures - z.
- B. woven, knitted, crocheted, braided or laid - include and can be produced from a corresponding starting material, for example by winding.
- a single reinforcing thread according to the invention is considered as a textile line structure.
- Several such reinforcing threads can be designed, for example, as longitudinal and / or circumferential threads, that together they form a textile fabric.
- the at least one Reinforcement thread, which is embedded in the at least one polymer layer, then represents the reinforcement structure of the press cover or its polymer layer.
- the starting material is understood to mean that material or semi-finished product by means of which the reinforcement structure of the finished press cover according to the invention is produced.
- Twisting is understood to mean the process in which individual fiber bundles are twisted together. Twisting corresponds to so-called hitting in the manufacture of ropes.
- braiding or interweaving means the regular intermeshing of several fibers or fiber bundles. The difference to weaving is that the fibers or fiber bundles are not fed at right angles to the main product direction during braiding.
- the individual fibers or fiber bundles of a respective reinforcing thread can be intertwined with one another around a core, as is the case, for example, with dynamic ropes such as climbing ropes.
- the core can be made of a different material than that of the fiber or the fiber bundle. It can e.g. have a higher elasticity, in order to store the energy in the soul analogously to the climbing ropes in case of overload, so that the entire reinforcement thread becomes longer but thinner in the event of local overload.
- the reinforcing thread or the reinforcing structure can be produced from or comprise a polymer. Suitable polymers are polyester, polyethylene naphthalate or polyamides, such as aramids.
- a press device means, for example, a shoe press, for example for dewatering or treatment, such as smoothing a fibrous web.
- the shoe press comprises a shoe press roll and a counter roll, which together form or limit a press nip.
- the Shoe press roll also includes a circumferential press jacket and a standing press element, the so-called press shoe. The latter is supported on a load-bearing, also standing yoke - for example via hydraulic press elements - and is pressed onto the surrounding press jacket.
- the press jacket rotates relative to the fixed press shoe and yoke and is thereby pressed against the counter roller in the press nip. Press shoe and yoke are arranged radially inside the press jacket.
- standing means that the press element does not rotate relative to the shoe press roll or the counter roll, but can translate - towards and away from the counter roll, preferably in the radial direction thereof - and thus relative to the counter roll.
- one or more press felts that circulate endlessly in the circumferential direction and / or further press belts that rotate continuously can be guided through the press nip of the shoe press.
- Such a shoe press can of course comprise more than one press nip.
- a fibrous web in the sense of the invention is to be understood as a scrim of fibers, such as flolz fibers, plastic fibers, glass fibers, carbon fibers, additives, additives or the like.
- the fibrous web can be designed as a paper, cardboard or tissue web. It can essentially comprise flolz fibers, it being possible for small amounts of other fibers or also additives and additives to be present. Depending on the application, this is left to the specialist.
- the press jacket is constructed from preferably a plurality of polymer layers arranged one above the other in the radial direction. If two polymer layers are provided, the radially inner one is the one with the reinforcing structure according to the invention. This means that the reinforcement structure is only arranged in the radially innermost polymer layer. If three or more polymer layers are provided, then the reinforcement structure is preferably arranged in the second lowest polymer layer, that is to say in the one that lies radially above the radially innermost polymer layer.
- the invention also relates to a press roll, such as a shoe press roll, for a
- Shoe press for dewatering a fibrous web the press roll having at least one press jacket according to the invention.
- the invention also relates to a shoe press for dewatering a fibrous web, preferably a paper, cardboard, tissue or cellulose web, comprising one
- press roll and a counter roll which together form or limit a nip, wherein the press roll comprises a rotating press jacket, the press jacket being designed according to the invention.
- the invention relates to the use of an inventive
- Press cover for a press such as a shoe press for dewatering a
- Fibrous web preferably a paper, cardboard, tissue or cellulose web.
- the invention is explained in more detail below with reference to the drawings without restricting generality.
- the drawings show:
- Fig. 1 is a partially sectioned, schematic side view of a
- Fig. 3 is a highly schematic representation of a device for
- 4a and 4b is a greatly simplified, non-scale representation of one end of a reinforcing thread according to the invention.
- a shoe press 10 is shown in a partially sectioned, schematic side view in FIG. 1, which in the present case comprises a press roll according to the invention, such as a shoe press roll 12, and a counter roll 14.
- Shoe press roller 12 and counter roller 14 are arranged parallel to one another with respect to their longitudinal axes. Together they form or limit a nip 22.
- the shoe press roller 12 is composed of a shoe 16, a standing yoke 18 carrying it and a press jacket 20.
- Shoe 16 and yoke 18 are arranged fixed with respect to the counter roller 14 and the press jacket 20, respectively. That means they don't rotate.
- the shoe 16 is supported by the yoke 18 and pressed against the radially innermost surface of the press jacket 20 which rotates relative to it by means of hydraulic press elements (not shown).
- the press jacket 20, which surrounds the shoe 16 and yoke 18 in the circumferential direction, rotates about its longitudinal axis in the opposite direction of rotation to the counter-roller 14. Because of the concave The configuration of the shoe 16 on its side facing the counter roller 14 results in a comparatively long nip 22.
- the shoe press 10 is particularly suitable for dewatering fibrous webs 24.
- a fibrous web 24 with one or two press felts 26, 26 ' is guided through the press nip 22.
- a pressure is indirectly exerted on the fibrous web 24 in the nip 22 by the press felts 26, 26 '. This takes place in that the radially outermost surface of the counter-roller 14, on the one hand, and the radially outermost surface of the press jacket 20 come into direct contact with the corresponding press felts 26, 26 '.
- the liquid emerging from the fibrous web 24 is temporarily absorbed by the press felt (s) 26, 26 'and any depressions (not shown) provided in the surface of the press jacket. After leaving the nip 22, the liquid absorbed by the depressions of the press jacket 20 is thrown off before the press jacket 20 enters the press nip 22 again. In addition, the water absorbed by the press felt 26, 26 'can be removed with suction elements after leaving the press nip 22.
- the press felts 26, 26 ' can be dispensed with.
- the fibrous web 24 is in direct contact on the one hand with the press jacket 20 and on the other hand with the counter roll 14, which together form a press nip.
- the latter can then be designed as a heated drying cylinder.
- the press jacket shown in FIG. 1 can, as shown in the following figures, be designed according to the invention. 2a and 2b, different embodiments of the invention are shown in a cross-section through the longitudinal axis 20 'of the finished press jacket 20, which is not to scale and which is partially shown. The distance of the longitudinal axis 20 'too the radially innermost surface of the corresponding polymer layer of the press cover 20 is also not shown to scale.
- FIG. 2a shows a press jacket 20 with a single polymer layer 20.1.
- a reinforcement structure 20 ′′ is embedded in this.
- the polymer layer 20.1 is produced from a polyurethane. This is obtainable from a prepolymer and a crosslinking agent.
- the first polymer layer 20.1 is at the same time the radially outermost polymer layer of the press jacket 20.
- the arrangement relates - as also in the illustration in FIG. 2a - starting from the longitudinal axis 20 'of the press jacket 20 in its radial direction.
- the second polymer layer 20.2 is also the radially innermost polymer layer of the press jacket 20.
- Polymer layers 20.1, 20.2 are directly adjacent to one another when viewed in the radial direction, i.e. there is no intermediate layer between these two.
- a third polymer layer 20.3 is indicated in dashed lines. The latter is arranged radially within the second polymer layer 20.2. In the present case, there is only one in the second polymer layer 20.2.
- Reinforcement structure 20 " is provided. Of course, this could also be different, so that, alternatively or additionally, such a reinforcement structure 20" could also be arranged in the first polymer layer 20.1 and / or the third polymer layer 20.3.
- the first and second polymer layers 20.1, 20.2 are each made of or contain a polyurethane. The same applies analogously to FIG. 2a.
- the reinforcement structure 20 is completely embedded in the corresponding polymer layer 20.1 or 20.2. This means that the reinforcement structure 20" does not extend beyond the boundaries of the polymer layer 20.1, 20.2. In principle, it would be conceivable for the reinforcement structure 20 "to be directly adjacent to one another by delimiting two adjacent polymer layers 20.1, 20.2, 20.3 would go out. In other words, the reinforcement structure 20 ′′ would at the same time be embedded in two adjacent polymer layers 20.1, 20.2, 20.3.
- the reinforcement structure 20 ′′ can consist of a plurality of reinforcement threads 21 designed as longitudinal threads 21.1. These run parallel to the longitudinal axis 20 'of the press casing 20 and are arranged at a distance from one another over its circumference. This can best be seen in FIG. 3.
- one or more reinforcing threads 21, each running spirally over the circumference of the corresponding polymer layer 20.1, 20.2 and designed as circumferential threads 21.2 can also be provided, see again FIG. 2.
- the latter are indicated in FIG. 2a and 2b with circles drawn in broken lines , 2, the plurality of longitudinal threads 21.1 and the at least one circumferential thread 21.2 form a scrim with one another.
- the circumferential threads 21.2 are arranged such that they surround the longitudinal threads 21 .1, that is to say they are arranged further radially outward than the longitudinal threads 21.1.
- Longitudinal threads 21.1 and the at least one circumferential thread 21.2 cross each other when viewed in the radial direction as a result of the spiral winding of the at least one circumferential thread 21.2. Seen in the radial direction (ie in the sectional view of Fog. 2a and b), however, they do not touch at these intersection points but are arranged at a distance from one another. This has the advantage that a better force distribution of local overloads acting radially on the outside of the press jacket 20 in the direction radially inward is transmitted to the longitudinal threads 21.1 via the at least one circumferential thread 21.2.
- the radially outermost surface of the press casing 20 or the corresponding polymer layer 20.1 can have grooves or blind bores.
- FIGS. 4a and 4b show a greatly simplified, not to scale representation of one end of a reinforcing thread 21 according to the invention, which is used as a longitudinal thread 21.1 and / or circumferential thread 21.2 can be executed.
- the illustration shows how such a reinforcing thread 21 is produced, ie the distances between the individual fibers or fiber bundles 22 from one another are exaggerated.
- both reinforcing threads 21 are produced by braiding several fibers or fiber bundles 22.
- 4a an odd number of fibers or fiber bundles 22 (here: three) is provided, so that this results in a reinforcing thread 21, which is a flat braid.
- 4b on the other hand, an even number of fibers or fiber bundles 22 (here: four) is provided, so that a round braid results as reinforcing thread 21.
- the fibers or fiber bundles 22 of each reinforcing thread 21 are intertwined like a braid.
- the reinforcement thread 21 shown in FIGS. 4a and b can be used as longitudinal or circumferential thread 21.1, 21.2 in the reinforcement structure 20 "of the press jacket 20, as shown in the preceding figures.
- FIG. 3 shows, in a highly schematic side view, a device for producing a press jacket 20 according to the invention.
- the device has exactly one cylindrical winding mandrel 4.
- a plurality of reinforcing threads 21 designed as longitudinal threads 21.1 are spaced apart from one another on the circumference.
- a polymer is applied to the radially outermost lateral surface of the winding mandrel 4 in order to apply a polymer layer 20.1, 20.2, 20.3 — as described in the previous figures.
- a circumferential thread 21.2 spirally introduced into the polymer of the polymer layer 20.1, 20.2, 20.3. After embedding in the polymer, the circumferential thread 21.2 forms together with the longitudinal threads 21.1 the reinforcing structure 20 ′′ of the finished press jacket 20 according to the invention.
- the winding mandrel 4 is rotatably mounted about its longitudinal axis 20 ', which corresponds to the longitudinal axis of the press jacket to be produced. Longitudinal axis 20 'runs here vertically into the plane of the drawing.
- the casting material such as pourable, curable elastomeric polymer, for example polyurethane, is fed via a line 5 through a casting nozzle 6 from above onto the radially outermost lateral surface of the winding mandrel 4 or onto the longitudinal threads 21.1.
- a casting material can, for example, be selected with regard to its pot life and viscosity such that it does not drip off the mandrel 4 during casting.
- the winding mandrel 4 is rotated in the direction of the arrow about its longitudinal axis.
- the casting nozzle 6 is guided along a suitable guide, not shown in FIG. 3, parallel to the longitudinal axis 20 'along this relative to the winding mandrel 4.
- the at least one peripheral thread 21.2 is unwound and spirally wound into coils on the rotating mandrel 4.
- the casting material can pass through the longitudinal threads 21.1 to the winding mandrel 4.
- the polymer forms a radially innermost and preferably elastomeric polymer layer, which corresponds, for example, to the polymer layer 20.1 of the press jacket from FIG. 2a, of which only a part is shown in FIG. 3.
- the casting material emerging from the casting nozzle 6 is a mixture of a prepolymer and a crosslinking agent.
- the former is provided from a prepolymer container, not shown, in which it is stored or mixed.
- the prepolymer can comprise an isocyanate according to the invention and a polyol. In 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.
- the prepolymer container and crosslinker container are assigned to the device for producing a press jacket 20. They are connected in a flow-conducting manner via lines, also not shown, to a mixing chamber (not shown) which is arranged upstream of the pouring nozzle 6 in the flow direction.
- the prepolymer-crosslinking agent mixture is thus produced upstream and outside the pouring nozzle 6, that is to say mixed in the mixing chamber. Regardless of the production of the mixture, this is then applied to the surface of the mandrel 4 to form the at least one polymer layer of the press cover 20.
- a continuous casting process which is also known as rotary casting
- an endless cylindrical tubular press jacket 20 which is closed about its longitudinal axis 20 ′ and whose inner circumference essentially corresponds to the outer circumference of the winding mandrel 4, is thus gradually produced over the width of the winding mandrel 4 ,
- the press jacket 20 is designed according to the invention.
- the reinforcing structure 20 ′′ of the at least one polymer layer 20.1, 20.2 could also be constructed from a plurality of layers of longitudinal and circumferential threads 21.1, 21.2, one on top of the other in the radial direction and each extending in the longitudinal axis direction and in the circumferential direction of the press jacket 20 his.
Landscapes
- Paper (AREA)
- Ropes Or Cables (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018118603.7A DE102018118603A1 (de) | 2018-08-01 | 2018-08-01 | Pressmantel, dessen Verwendung sowie Presswalze und Schuhpresse |
PCT/EP2019/065493 WO2020025210A1 (de) | 2018-08-01 | 2019-06-13 | Pressmantel, dessen verwendung sowie presswalze und schuhpresse |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3830334A1 true EP3830334A1 (de) | 2021-06-09 |
Family
ID=66857915
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19730354.8A Withdrawn EP3830334A1 (de) | 2018-08-01 | 2019-06-13 | Pressmantel, dessen verwendung sowie presswalze und schuhpresse |
Country Status (6)
Country | Link |
---|---|
US (1) | US11306438B2 (de) |
EP (1) | EP3830334A1 (de) |
JP (1) | JP7309851B2 (de) |
CN (1) | CN112534098B (de) |
DE (1) | DE102018118603A1 (de) |
WO (1) | WO2020025210A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN117280092A (zh) * | 2021-05-12 | 2023-12-22 | 福伊特专利有限公司 | 辊套和辊子 |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE29621524U1 (de) * | 1996-03-08 | 1997-02-27 | Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim | Pressmantel für eine Pressvorrichtung |
US5753085A (en) * | 1996-06-11 | 1998-05-19 | Albany International Corp. | Textile substrate for a long nip press belt |
US5772848A (en) * | 1996-12-03 | 1998-06-30 | Albany International Corp. | Braided base fabrics for shoe press belts |
US6174825B1 (en) * | 1997-12-09 | 2001-01-16 | Albany International Corp. | Resin-impregnated belt for application on papermaking machines and in similar industrial application |
US6465074B1 (en) * | 1999-08-25 | 2002-10-15 | Albany International Corp. | Base substrates for coated belts |
JP3614793B2 (ja) * | 2001-04-27 | 2005-01-26 | ヤマウチ株式会社 | シュープレス用ベルト |
DE10156146A1 (de) * | 2001-11-15 | 2003-05-28 | Voith Paper Patent Gmbh | Walzenmantel |
US20050003724A1 (en) * | 2003-07-02 | 2005-01-06 | Fitzpatrick Keith | Substrate for endless belt for use in papermaking applications |
JP4856475B2 (ja) * | 2006-06-05 | 2012-01-18 | イチカワ株式会社 | シュープレス用ベルト |
JP2008150739A (ja) * | 2006-12-18 | 2008-07-03 | Ichikawa Co Ltd | シュープレスベルト |
ES2487740T3 (es) * | 2009-02-13 | 2014-08-22 | Kao Corporation | Lámina de limpieza |
WO2015091654A1 (de) | 2013-12-20 | 2015-06-25 | Voith Patent Gmbh | Pressmantel oder prozessband für eine maschine zur herstellung und/oder behandlung einer faserbahn |
JP6289297B2 (ja) * | 2014-07-29 | 2018-03-07 | 日本フエルト株式会社 | シュープレスベルト用基布及びシュープレスベルト |
DE202017006805U1 (de) * | 2017-07-31 | 2018-06-18 | Voith Patent Gmbh | Pressmantel und die Verwendung eines solchen sowie Schuhpresse |
-
2018
- 2018-08-01 DE DE102018118603.7A patent/DE102018118603A1/de active Pending
-
2019
- 2019-06-13 US US17/265,005 patent/US11306438B2/en active Active
- 2019-06-13 WO PCT/EP2019/065493 patent/WO2020025210A1/de unknown
- 2019-06-13 EP EP19730354.8A patent/EP3830334A1/de not_active Withdrawn
- 2019-06-13 CN CN201980051215.7A patent/CN112534098B/zh active Active
- 2019-06-13 JP JP2021505353A patent/JP7309851B2/ja active Active
Also Published As
Publication number | Publication date |
---|---|
US11306438B2 (en) | 2022-04-19 |
CN112534098B (zh) | 2023-07-28 |
JP7309851B2 (ja) | 2023-07-18 |
DE102018118603A1 (de) | 2020-02-06 |
US20210324579A1 (en) | 2021-10-21 |
WO2020025210A1 (de) | 2020-02-06 |
JP2021533278A (ja) | 2021-12-02 |
CN112534098A (zh) | 2021-03-19 |
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