EP4034707A1 - Method for operating a shoe press, shoe press, machine comprising a shoe press, and use of an ink in a lubricant for a shoe press - Google Patents
Method for operating a shoe press, shoe press, machine comprising a shoe press, and use of an ink in a lubricant for a shoe pressInfo
- Publication number
- EP4034707A1 EP4034707A1 EP20746132.8A EP20746132A EP4034707A1 EP 4034707 A1 EP4034707 A1 EP 4034707A1 EP 20746132 A EP20746132 A EP 20746132A EP 4034707 A1 EP4034707 A1 EP 4034707A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- press
- shoe
- polymer layer
- reinforcing
- jacket
- 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
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000000314 lubricant Substances 0.000 title claims description 12
- 229920000642 polymer Polymers 0.000 claims abstract description 115
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 37
- 230000001050 lubricating effect Effects 0.000 claims abstract description 29
- 239000012530 fluid Substances 0.000 claims abstract description 16
- 230000002787 reinforcement Effects 0.000 claims description 49
- 239000000463 material Substances 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 14
- 230000005540 biological transmission Effects 0.000 claims description 10
- 238000002834 transmittance Methods 0.000 claims description 10
- 238000002845 discoloration Methods 0.000 claims description 9
- 229920002635 polyurethane Polymers 0.000 claims description 6
- 239000004814 polyurethane Substances 0.000 claims description 6
- 239000004952 Polyamide Substances 0.000 claims description 2
- 229920003235 aromatic polyamide Polymers 0.000 claims description 2
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 claims description 2
- 229920002647 polyamide Polymers 0.000 claims description 2
- 229920000728 polyester Polymers 0.000 claims description 2
- -1 polyethylene naphthalate Polymers 0.000 claims description 2
- 239000011112 polyethylene naphthalate Substances 0.000 claims description 2
- 230000008569 process Effects 0.000 claims description 2
- 239000004760 aramid Substances 0.000 claims 1
- 238000005461 lubrication Methods 0.000 claims 1
- 230000008859 change Effects 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 82
- 238000004804 winding Methods 0.000 description 18
- 239000007858 starting material Substances 0.000 description 11
- 238000005266 casting Methods 0.000 description 10
- 239000000835 fiber Substances 0.000 description 10
- 230000005855 radiation Effects 0.000 description 8
- 239000004971 Cross linker Substances 0.000 description 7
- 230000004907 flux Effects 0.000 description 7
- 239000012783 reinforcing fiber Substances 0.000 description 7
- 239000004753 textile Substances 0.000 description 7
- 239000000123 paper Substances 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 239000004744 fabric Substances 0.000 description 4
- 238000004020 luminiscence type Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 229920002522 Wood fibre Polymers 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 239000012948 isocyanate Substances 0.000 description 2
- 150000002513 isocyanates Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 229920005862 polyol Polymers 0.000 description 2
- 150000003077 polyols Chemical class 0.000 description 2
- 230000002028 premature Effects 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 239000002025 wood fiber Substances 0.000 description 2
- 241000283707 Capra Species 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000013461 design 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
- 230000005281 excited state Effects 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 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
- 238000007670 refining Methods 0.000 description 1
- 230000027756 respiratory electron transport chain Effects 0.000 description 1
- 238000010106 rotational casting Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
-
- 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
-
- 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
- D21F3/0209—Wet presses with extended press nip
- D21F3/0218—Shoe presses
- D21F3/0227—Belts or sleeves therefor
- D21F3/0236—Belts or sleeves therefor manufacturing methods
-
- 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
- D21F3/04—Arrangements thereof
- D21F3/045—Arrangements thereof including at least one extended press nip
-
- 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
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
- D21G1/006—Calenders; Smoothing apparatus with extended nips
Definitions
- the invention is based on a press cover, in particular for a press device for treating a fibrous web, e.g. for smoothing or dewatering it, in detail according to the independent claims.
- the invention also relates to a shoe press and the use of a press jacket in such and to a machine comprising such a shoe press, 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 cover that encircles the stationary shoe. The latter is deformable and essentially assumes a tubular shape in operation.
- the shoe is shaped in such a way that it forms a press nip (press nip) with a counter roller.
- the press nip is defined by the contact surface of the counter roll in the shoe.
- the shoe is designed to be movable and can be moved to the counter roll.
- Press jacket should increase.
- the press cover must therefore be sufficiently flexible so that it can be guided around the shoe, it must be sufficiently rigid so that it does not deform or compress too much in the nip under the press load, and it must be sufficiently wear-resistant.
- Press jackets 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 objects mentioned at the outset.
- Press sleeves known from the prior art tend to premature failure during normal operation as a result of - often only local - overloading in the nip. This occurs when a foreign body passes through the nip during a so-called lump passage. Such an overload often leads to the reinforcement threads or the polymer layer in which they are embedded breaking.
- a press jacket that is oil-lubricated from the inside, for example, can leak so that the oil comes into contact with the fibrous web to be produced. As a result, the press jacket must be changed. In practice, this leads to unplanned downtimes of the pressing device and thus to increased, costly downtimes.
- a total failure of the press jacket due to even only local damage to it as a result of overloading in normal operation is to be prevented or the consequences thereof are to be recognized early.
- the downtimes of a press device equipped with such a press cover should be reduced.
- the reinforcing fibers are coated with or contain a dye which only leads to (local) discoloration of the reinforcing fibers on contact with the lubricating fluid.
- the coloring agent can be contained in the lubricating liquid, for example by adding it to the lubricating liquid. Regardless of how the discoloration happens, it can be permanent.
- the dye can be a dye that reacts with luminescence.
- Luminescence means that some or all of the energy supplied to the dye from the outside is not converted into thermal energy, but rather puts the dye into an excited state and emits light (including radiation outside the range that is visible to the human eye).
- Luminescence can be divided into two areas, namely fluorescence and phosphorescence. Fluorescence is the spontaneous emission of light shortly after a material is excited by electron transfer. The emitted light is usually lower in energy than what was previously absorbed. Phosphorescence, on the other hand, is the property of a substance to glow in the dark after exposure to (visible or UV) light.
- the dye that can be added to the lubricating fluid can be both a luminescent, ie fluorescent or phosphorescent dye.
- the press jacket can therefore be illuminated or transilluminated with light, for example from an LED lamp or a laser.
- the light can be to the human eye act invisible light, e.g. ultraviolet light.
- the dye can be selected in such a way that it has a luminescence, that is to say, as a result of the irradiation with the light that is invisible to the human eye, it emits light that is in turn visible to the human eye.
- a possible, local overload of the press jacket can then be detected optically by irradiating the press jacket with light, for example in the crawl of the machine, in which the press jacket rotates more slowly than in normal operation in which the machine is producing the fibrous web.
- the energy supplied from the outside can take place within the radial extension of the press jacket (that is to say from the inside) or outside of this radial extension (that is to say on the outside of the press jacket).
- the radial extension is based in each case on the longitudinal axis of the press jacket. Accordingly, the energy source can be arranged inside or outside the press jacket,
- the lubricating fluid can be oil, such as hydraulic oil. It is advantageous if there is a sufficiently large optical contrast between the reinforcement structure and the at least one polymer layer in which it is embedded. If the overload is large enough, it usually leads to local damage to the reinforcement structure. eg in the form of tears in the threads. Torn threads can then be better recognized with the human eye, so that a planned, premature change of the press cover can take place. Even before the press jacket starts to leak and lubricant reaches the fibrous web to be produced. In order to achieve such a sufficiently large optical contrast, the materials of the reinforcement structure and of the at least one polymer layer can be selected such that their transmittance for visible light differs from one another.
- the reinforcement structure can shine through the polymer layer under appropriate lighting conditions.
- the material of the at least one polymer layer is more transparent or more transparent (that is, less opaque) than that of the reinforcement structure
- such a sufficient optical contrast can be produced if the materials of the reinforcement structure and the at least one polymer layer are chosen so that the transmittance of the entire press jacket for visible light is between 15% and 90%, preferably between 15% and 35%.
- the degree of transmission describes the proportion of the incident radiation or luminous flux that completely penetrates a transparent component.
- the incident radiation flux that strikes the component can be transmitted, reflected and absorbed by it. Accordingly, the following power balance of the radiation flux impinging on the component results in a degree of transmission (T), a degree of reflection (R) and a degree of absorption (A)
- the transmittance corresponds to that part of the incident radiation flux that is reduced by the degree of reflection (R) and the degree of absorption (A).
- Another term for the degree of transmission is the term total transmission Tt.
- the latter or the degree of transmission corresponds to the ratio of the reciprocal value of the incident radiation flux Ti to the radiation flux T2 allowed through the transparent component, that is to say T2 / T1. If so If we are talking about, for example, that the material of the at least one polymer layer has a transmittance of 50%, then it only lets through half of the incident radiation flux.
- the degree of transmission or the total transmission are defined and measurable in accordance with ASTM D 1003-00.
- the measurement can take place at any point on the press cover, for example also at its axial edges, for example in the area of the tabs by means of which such a press cover is held on the two lateral tensioning disks.
- the specification of the degree of transmission can relate to a brand-new, i.e. finished, press jacket.
- the two definitions want to express that the press cover is sufficiently transparent to see the discoloration of the reinforcement threads even better if the at least one polymer layer in which the reinforcement structure is embedded breaks.
- a press jacket in the sense of the invention is a closed belt, hose or jacket that is endless in the circumferential direction around its longitudinal axis and which, as shown, is guided through the nip (press nip) of a shoe press together with a fibrous web.
- the radially outermost surface can be used to dewater the fibrous web
- the press cover can also come into direct contact with the fibrous web during normal operation, for example to smooth it. At its axial ends it is open - viewed in the width direction (along the longitudinal axis). In this way, the press cover can be held at these axial ends by two lateral tensioning disks in order to form the shoe press roll. Instead of being guided by the two lateral tensioning disks, the press cover can be guided over the press shoe and several guide rollers, as is the case with open shoe presses.
- the press shoe reaches a part of the radially innermost surface of the press cover (temporarily) in contact.
- the radially outermost surface of such a press jacket for example the radially outermost polymer layer of the same, can be provided with grooves and / or blind bores.
- the longitudinal direction means that direction which runs parallel to the longitudinal axis of the press jacket.
- 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 jacket runs around the longitudinal axis, seen around its radial boundary.
- the term parallel also includes those angular deviations between two reinforcing threads lying in different planes of +/- 5 ° to one another.
- the press jacket or the at least one polymer layer can be produced 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 pourable, curable, preferably elastomeric polymer or is produced entirely from it.
- the polymer layer can preferably be a cured layer produced in one piece by primary molding. In other words, it is originally monolithically formed, i.e. made by, for example, casting.
- the term “one-piece” also includes cases in which the one layer was again produced from several layers of the same material when the polymer was cast. However, this is 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.
- a plurality of polymer layers 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 across the width of the press jacket means that the press jacket is, for example, only single-layered at its axial ends along the longitudinal axis of the press jacket, whereas it is between the press jacket axial ends is formed in two or more layers.
- 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 also 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 in the region of the width edges than a radially inner or radially innermost polymer layer.
- Precisely one, two or three polymer layers are preferably provided. These can be identical in terms of their polymer or vary in terms of their hardness or stoichiometry of the prepolymer.
- a total thickness of the finished press jacket in a section through its longitudinal axis, measured in the radial direction can be 5 to 10 mm, preferably 5 to 7, particularly preferably 5 to 6 mm.
- the press jacket when a single layer is provided, the press jacket can be made from only one cast, ie monolithically, so that the single layer has the thickness just mentioned.
- a finished press cover within the meaning of the invention is one whose at least one polymer layer is cured and possibly finally processed, i.e. ready for use in, for example, a shoe press for the purpose mentioned at the beginning.
- a finished polymer layer means a layer that has cured.
- a reinforcing thread within the meaning of the invention is understood to be a pliable, textile line structure that has a dominant extension and uniformity in its longitudinal direction.
- a single, endless fiber in the manner of a monofilament is meant.
- a fiber bundle is spoken of within the meaning of the invention, it is not a question of monofilaments but, in turn, a single thread, such as a twisted thread or yarn, that is, a bundle of continuous fibers or monofilaments.
- the fiber bundles themselves can be made from fibers twisted together.
- 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 circumferential thread are produced in this way. If, for example, a scrim of circumferential and longitudinal threads is preferably present, this means that at least the longitudinal threads are designed according to the invention.
- reinforcement structure in the context of the invention means reinforcement of the at least one layer containing or consisting of the polymer - that is to say the polymer layer.
- the reinforcement structure can be completely embedded in the polymer layer, so that the reinforcement structure does not go beyond the delimitation 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 be textile line structures - z. B. yarns or twisted threads - and / or textile fabrics - such. B. woven, knitted, knitted fabrics, braids or scrims - and can be produced from a corresponding starting material, e.g. by winding.
- a single reinforcing thread according to the invention is, considered in and of itself, a textile line structure.
- Several such reinforcing threads can be designed, e.g. as longitudinal and / or circumferential threads, so that they together 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 jacket or its polymer layer a reinforcement thread.
- the reinforcement thread or the reinforcement structure can be produced from a polymer or comprise such a polymer.
- Polymers are polyester, polyethylene naphthalate or polyamides, such as aramids.
- the materials of the at least one polymer layer and the at least one reinforcement thread or reinforcement structure embedded therein thus differ.
- a pressing 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 delimit a press nip.
- the shoe press roll further comprises a revolving press cover and a standing press element, the so-called press shoe.
- the latter is supported on a supporting, also standing yoke - for example via hydraulic press elements - and is pressed against the surrounding press casing.
- the press jacket rotates relative to the stationary press shoe and yoke and is thereby pressed against the counter roll in the press nip.
- the press shoe and yoke are arranged radially inside the press jacket. The term is understood to mean that the press element does not rotate relative to the shoe press roll or the counter roll, but can move in a translatory manner - towards the counter roll and away from it, preferably in the radial direction thereof - and thus relative to the counter roll.
- a fibrous web in the context of the invention is to be understood as meaning a scrim or tangle of fibers, such as wood 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 wood fibers, small amounts of other fibers or also additives and additives being able to be present. Depending on the application, this is left to the specialist.
- the advantages according to the invention are fulfilled particularly well. Because a clutch is able to absorb local overloads particularly well.
- the advantages according to the invention are achieved particularly well if the press cover is constructed from preferably several polymer layers arranged one above the other in the radial direction. If two polymer layers are provided, then the radially inner one is that with the reinforcement structure according to the invention. This means that the reinforcement structure is only arranged in the radially innermost polymer layer.
- the reinforcement structure is preferably arranged in the second lowermost polymer layer, that is to say in that which lies radially above the radially innermost polymer layer.
- the invention also relates to a machine, such as a paper machine for producing or refining a fibrous web, comprising a shoe press for dewatering the fibrous web.
- the invention also relates to a shoe press for dewatering a fibrous web, preferably a paper, cardboard, tissue or cellulose web, comprising a
- press roll and a counter roll which together form or delimit a nip
- the press roll comprising a revolving press cover, the press cover being designed according to the invention.
- Dye in a lubricating liquid of a shoe press comprising a press jacket for dewatering a fibrous web, preferably a paper, cardboard, tissue or cellulose web.
- Fig. 1 is a partially sectioned, schematic side view of a
- Shoe press with a press cover according to an embodiment of the present invention.
- 2a and 2b embodiments of a press jacket, each seen in a section through its longitudinal axis;
- FIG. 3 shows a highly schematic representation of a device for producing the press jacket in a side view.
- FIG. 1 shows a partially sectioned, schematic side view of a shoe press 10, 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 roll 12 and counter roll 14 are arranged parallel to one another with regard to their longitudinal axes. Together they form a nip 22 or delimit one.
- the shoe press roll 12 is composed of a shoe 16, an upright yoke 18 carrying it, and a press cover 20.
- Shoe 16 and yoke 18 are arranged in a fixed manner with respect to counter roll 14 and press cover 20, respectively. That means they don't rotate.
- the shoe 16 is supported by the yoke 18 and is pressed against the radially innermost surface of the press jacket 20, which is circumferential relative thereto, via 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-roll 14.
- the concave design of the shoe 16 on its side facing the counter-roll 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 passed through the press nip 22.
- a pressure is exerted indirectly in the nip 22 on the fibrous web 24 by the press felts 26, 26 '. This is done by having the radially outermost surface of the Counter roll 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 press jacket surface. After leaving the nip 22, the liquid absorbed by the depressions in the press jacket 20 is thrown off before the press jacket 20 re-enters the press nip 22. In addition, the water taken up by the press felt 26, 26 ′ can be removed with suction elements after it has left 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 20 slides with its radially inner surface on the hose 16.
- the shoe 16 is connected to a lubricant reservoir 28 in a flow-guiding manner for the supply of lubricating fluid. This is indicated by the dashed line.
- appropriate means can be provided for conveying the lubricant from the lubricant reservoir 28 to the shoe 16, for example pumps.
- the press jacket shown in FIG. 1 can, as shown in the following figures, be designed according to the invention.
- FIGS. 2a and 2b show different embodiments of the invention in a not to scale, partially shown cross section through the longitudinal axis 20 'of the finished press jacket 20.
- Press jacket 20 is also not shown to scale. According to FIG. 2a, exactly two polymer layers are provided, namely a first 20.1 and a second 20.2.
- the first polymer layer 20.1 is also the radially outermost polymer layer of the press jacket 20.
- the second polymer layer 20.2 is also the radially innermost polymer layer of the press jacket 20. Both polymer layers 20.1, 20.2 are directly adjacent to one another in the radial direction, i.e. there is no intermediate layer between these two.
- a reinforcement structure 20 ′′ can be provided in the second polymer layer 20.2. In the present case, this is completely embedded in the polymer layer 20.2. This is indicated by the hatched circles, which can be textile planar structures or line structures such as fibers. that the reinforcement structure 20 ′′ does not extend beyond the boundaries of the polymer layer 20.2.
- the reinforcement structure 20 ′′ here comprises a plurality of reinforcement threads 21 serving as longitudinal threads 21.1. These are arranged in the longitudinal direction of the press jacket 20 over its circumference at a distance and running parallel to one another.
- at least one further reinforcement thread 21 is provided here as circumferential thread 21.2, which is preferably within the same polymer layer 20.1, 20.2, 20.3, in which the longitudinal threads 21.1 are also arranged, runs helically in the circumferential direction of the press jacket.
- the longitudinal threads 21.1 and the circumferential thread 21.2 form a scrim with one another, namely in such a way that the longitudinal threads 21.1 radially inside the at least one circumferential thread 21.2 - viewed in relation to the longitudinal axis 20 'of the press jacket 20 - are arranged.
- the first and a second polymer layer 20.1, 20.2 are made from a polyurethane.
- This can be obtained, for example, from a prepolymer and a crosslinker.
- the respective prepolymer itself can be obtained by reacting an isocyanate with a polyol.
- FIG. 2b shows a three-layer press jacket. This comprises a - here radially outermost - first polymer layer 20.1, a radially innermost, third polymer layer 20.3 and a second polymer layer 20.2 sandwiched between these two.
- the arrangement relates - as also in the illustration in FIG. 2a - starting from the longitudinal axis 20 'of the press jacket 20, seen in its radial direction.
- a (single) reinforcement structure 20 is only provided in the second polymer layer 20.2.
- this could also be different, so that, alternatively or in addition, 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 statements made for the reinforcement structure 20 ′′ in FIG. 2a apply analogously.
- the advantages according to the invention are implemented particularly well if the polyurethane of the at least one polymer layer 20.1, 20.2, 20.3 or of all polymer layers, as mentioned above, is selected in such a way that it is more transparent than the material of the reinforcement structure 20 " . 3 shows, in a highly schematic side view, a device for producing a press jacket 20 according to the invention.
- the device in the present case has exactly one cylindrical winding mandrel 4, with a starting material 20 "'being applied in a spiral, for example, to its radially outermost jacket surface. "After embedding in the polymer, it forms the reinforcement structure 20" of the finished press jacket 20 according to the invention.
- the illustration shows an initial stage of the manufacturing process.
- one end of the starting material 20 '' ' is attached to a polymer which is arranged on the outer circumference of the winding mandrel 4.
- one end of the starting material 20' '' could also be directly, that is, directly on rest or be applied to the winding mandrel 4 without initially providing a polymer between the starting material 20 '"and the winding mandrel 4.
- the starting material 20'" can be a flat textile structure or a linear structure.
- 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 'here runs perpendicularly into the plane of the drawing.
- a casting material such as a castable, curable elastomeric polymer, for example polyurethane, is fed from above via a line 5 through a casting nozzle 6 onto the radially outermost lateral surface of the winding mandrel 4 or onto the starting material 20 '" and viscosity are selected such that it does not drip down from the winding mandrel 4 during casting.
- the winding mandrel 4 is rotated in the direction of the arrow about its longitudinal axis.
- the pouring nozzle 6 is parallel to the The longitudinal axis 20 'is guided along this relative to the winding mandrel 4.
- the starting material 20'" is unrolled and wound onto the rotating winding mandrel 4 to form coils.
- the casting material can pass through the starting material 20 '"to the winding mandrel 4.
- the polymer forms a radially innermost and preferably elastomeric one after the curing step Polymer layer which corresponds to the polymer layer 20.2 of the press jacket from FIG. 2a, only a part of which is shown in FIG. 3.
- the casting material emerging from the casting nozzle 6 is in the present case a mixture of a prepolymer and a crosslinker.
- the former is provided from a prepolymer container (not shown) in which it is stored or mixed.
- the prepolymer is the reaction product of an isocyanate according to the invention and a polyol. It can be present in the prepolymer container, for example, in the form of a prepolymer made 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 positioning a press jacket 20. They are connected in a flow-conducting manner to a mixing chamber (not shown) connected upstream of the pouring nozzle 6 in the direction of flow via lines, which are likewise not shown.
- the prepolymer / crosslinker mixture is thus produced upstream and outside of the pouring nozzle 6, that is to say is mixed in the mixing chamber. Independently of the production of the mixture, it is then applied to the surface of the winding mandrel 4 in order to form the at least one polymer layer of the press jacket 20.
- two or more pouring nozzles 6 could be provided. These could be connected to separate prepolymer and crosslinker containers via corresponding lines in order to also supply different polymers to the majority of the goat nozzles 6 independently of one another.
- the casting nozzles 6 could then be arranged along the longitudinal axis of the press jacket 20 at a distance from one another in order to produce several polymer layers 20.1, 20.2, 20.3 simultaneously in one cast by simultaneously applying the polymer from the casting nozzles 6.
- a closed cylindrical tubular press jacket 20 By means of such a continuous casting process, which is also known as rotational casting, gradually an endless, A closed cylindrical tubular press jacket 20, the inner circumference of which essentially corresponds to the outer circumference of the winding mandrel 4, is produced around its longitudinal axis 20 ′.
- wind the starting material 20 '''on more than the one winding mandrel 4 shown in FIG. 3.
- two winding mandrels could be provided, which could be arranged parallel with respect to their longitudinal axes at a distance from one another Polymer also to be applied to the radially inner circumferential surface of the winding mandrel 4, for example in the manner of centrifugation.
- the finished press cover 20 is finally removed from the at least one winding mandrel 4.
- the press jacket 20 is designed according to the invention.
- the reinforcement structure 20 ′′ of the at least one polymer layer 20.1, 20.2 could also be constructed from several starting materials 20 ′ ′′ superposed in the radial direction, each extending in the longitudinal axis direction and in the circumferential direction of the press jacket 20.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Paper (AREA)
- Mounting, Exchange, And Manufacturing Of Dies (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019126075.2A DE102019126075A1 (en) | 2019-09-27 | 2019-09-27 | Press jacket, its use as well as shoe press and machine |
PCT/EP2020/070410 WO2021058166A1 (en) | 2019-09-27 | 2020-07-20 | Method for operating a shoe press, shoe press, machine comprising a shoe press, and use of an ink in a lubricant for a shoe press |
Publications (2)
Publication Number | Publication Date |
---|---|
EP4034707A1 true EP4034707A1 (en) | 2022-08-03 |
EP4034707B1 EP4034707B1 (en) | 2023-05-24 |
Family
ID=71786912
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20746132.8A Active EP4034707B1 (en) | 2019-09-27 | 2020-07-20 | Method for operating a shoe press, shoe press, machine comprising a shoe press, and use of an ink in a lubricant for a shoe press |
Country Status (7)
Country | Link |
---|---|
US (1) | US20220333305A1 (en) |
EP (1) | EP4034707B1 (en) |
JP (1) | JP2022550347A (en) |
CN (1) | CN114450448A (en) |
DE (1) | DE102019126075A1 (en) |
FI (1) | FI4034707T3 (en) |
WO (1) | WO2021058166A1 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4411621A1 (en) * | 1994-04-02 | 1995-10-05 | Voith Sulzer Papiermasch Gmbh | Long-life abrasion-proof pressing cover to drain water from paper web |
DE19613392C1 (en) * | 1996-04-03 | 1997-07-24 | Voith Sulzer Papiermasch Gmbh | Fibre web press assembly |
JP3698984B2 (en) * | 2000-11-10 | 2005-09-21 | ヤマウチ株式会社 | Shoe press belt |
DE102005007835A1 (en) * | 2005-02-21 | 2006-08-31 | Voith Paper Patent Gmbh | Press Nip Control |
DE102009055248A1 (en) * | 2009-12-23 | 2011-06-30 | Voith Patent GmbH, 89522 | Apparatus and method for monitoring a pressing device |
DE102018105312A1 (en) * | 2018-03-08 | 2019-09-12 | Voith Patent Gmbh | Shoe roll system and method for monitoring the tightness of a shoe roll |
-
2019
- 2019-09-27 DE DE102019126075.2A patent/DE102019126075A1/en not_active Ceased
-
2020
- 2020-07-20 WO PCT/EP2020/070410 patent/WO2021058166A1/en active Application Filing
- 2020-07-20 JP JP2022519230A patent/JP2022550347A/en not_active Withdrawn
- 2020-07-20 CN CN202080067631.9A patent/CN114450448A/en active Pending
- 2020-07-20 US US17/764,276 patent/US20220333305A1/en not_active Abandoned
- 2020-07-20 EP EP20746132.8A patent/EP4034707B1/en active Active
- 2020-07-20 FI FIEP20746132.8T patent/FI4034707T3/en active
Also Published As
Publication number | Publication date |
---|---|
DE102019126075A1 (en) | 2021-04-01 |
US20220333305A1 (en) | 2022-10-20 |
CN114450448A (en) | 2022-05-06 |
FI4034707T3 (en) | 2023-08-18 |
EP4034707B1 (en) | 2023-05-24 |
JP2022550347A (en) | 2022-12-01 |
WO2021058166A1 (en) | 2021-04-01 |
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