EP3649287B1 - Press sleeve, use thereof, and process for manufacturing the press sleeve - Google Patents
Press sleeve, use thereof, and process for manufacturing the press sleeve Download PDFInfo
- Publication number
- EP3649287B1 EP3649287B1 EP18731420.8A EP18731420A EP3649287B1 EP 3649287 B1 EP3649287 B1 EP 3649287B1 EP 18731420 A EP18731420 A EP 18731420A EP 3649287 B1 EP3649287 B1 EP 3649287B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- press
- component
- polyol
- press cover
- crosslinker
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims description 9
- 238000004519 manufacturing process Methods 0.000 title description 10
- 229920000642 polymer Polymers 0.000 claims description 60
- 239000004971 Cross linker Substances 0.000 claims description 42
- 229920005862 polyol Polymers 0.000 claims description 37
- 150000003077 polyols Chemical class 0.000 claims description 34
- 238000004804 winding Methods 0.000 claims description 21
- 229920002635 polyurethane Polymers 0.000 claims description 16
- 239000004814 polyurethane Substances 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 14
- ALQLPWJFHRMHIU-UHFFFAOYSA-N 1,4-diisocyanatobenzene Chemical compound O=C=NC1=CC=C(N=C=O)C=C1 ALQLPWJFHRMHIU-UHFFFAOYSA-N 0.000 claims description 11
- -1 polyhexamethylene Polymers 0.000 claims description 9
- 239000007795 chemical reaction product Substances 0.000 claims description 8
- 229920000909 polytetrahydrofuran Polymers 0.000 claims description 8
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 7
- 239000003054 catalyst Substances 0.000 claims description 7
- 229920000570 polyether Polymers 0.000 claims description 7
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 6
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 6
- 239000002202 Polyethylene glycol Substances 0.000 claims description 6
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 6
- 150000004985 diamines Chemical class 0.000 claims description 6
- 239000000123 paper Substances 0.000 claims description 6
- 229920001223 polyethylene glycol Polymers 0.000 claims description 6
- 229920001451 polypropylene glycol Polymers 0.000 claims description 6
- 239000004417 polycarbonate Substances 0.000 claims description 5
- 229920000515 polycarbonate Polymers 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 239000005062 Polybutadiene Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 3
- 229920002857 polybutadiene Polymers 0.000 claims description 3
- 229920001610 polycaprolactone Polymers 0.000 claims description 3
- 239000004632 polycaprolactone Substances 0.000 claims description 3
- 229920005906 polyester polyol Polymers 0.000 claims description 3
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 230000001588 bifunctional effect Effects 0.000 claims description 2
- 229910052797 bismuth Inorganic materials 0.000 claims description 2
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims description 2
- NSPSPMKCKIPQBH-UHFFFAOYSA-K bismuth;7,7-dimethyloctanoate Chemical compound [Bi+3].CC(C)(C)CCCCCC([O-])=O.CC(C)(C)CCCCCC([O-])=O.CC(C)(C)CCCCCC([O-])=O NSPSPMKCKIPQBH-UHFFFAOYSA-K 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 239000011133 lead Substances 0.000 claims description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 2
- 229910052753 mercury Inorganic materials 0.000 claims description 2
- 150000002736 metal compounds Chemical class 0.000 claims description 2
- 150000002902 organometallic compounds Chemical class 0.000 claims description 2
- 239000010702 perfluoropolyether Substances 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims description 2
- 229910052700 potassium Inorganic materials 0.000 claims description 2
- 239000011591 potassium Substances 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- 239000011734 sodium Substances 0.000 claims description 2
- 150000003512 tertiary amines Chemical group 0.000 claims description 2
- 239000011135 tin Substances 0.000 claims description 2
- 239000010936 titanium Substances 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- IMNIMPAHZVJRPE-UHFFFAOYSA-N triethylenediamine Chemical compound C1CN2CCN1CC2 IMNIMPAHZVJRPE-UHFFFAOYSA-N 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- 239000002657 fibrous material Substances 0.000 claims 3
- 150000002148 esters Chemical class 0.000 claims 2
- VIOMIGLBMQVNLY-UHFFFAOYSA-N 4-[(4-amino-2-chloro-3,5-diethylphenyl)methyl]-3-chloro-2,6-diethylaniline Chemical group CCC1=C(N)C(CC)=CC(CC=2C(=C(CC)C(N)=C(CC)C=2)Cl)=C1Cl VIOMIGLBMQVNLY-UHFFFAOYSA-N 0.000 claims 1
- DZIHTWJGPDVSGE-UHFFFAOYSA-N 4-[(4-aminocyclohexyl)methyl]cyclohexan-1-amine Chemical compound C1CC(N)CCC1CC1CCC(N)CC1 DZIHTWJGPDVSGE-UHFFFAOYSA-N 0.000 claims 1
- 239000010410 layer Substances 0.000 description 49
- 230000002787 reinforcement Effects 0.000 description 17
- 239000007858 starting material Substances 0.000 description 13
- 238000005266 casting Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 10
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 239000012948 isocyanate Substances 0.000 description 4
- 150000002513 isocyanates Chemical class 0.000 description 4
- 239000004753 textile Substances 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 150000004651 carbonic acid esters Chemical class 0.000 description 3
- 239000003431 cross linking reagent Substances 0.000 description 3
- 230000007062 hydrolysis Effects 0.000 description 3
- 238000006460 hydrolysis reaction Methods 0.000 description 3
- 229920002522 Wood fibre Polymers 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 239000004744 fabric Substances 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
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 150000003139 primary aliphatic amines Chemical class 0.000 description 2
- 238000001175 rotational moulding Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 239000002025 wood fiber Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 150000004982 aromatic amines Chemical class 0.000 description 1
- 125000003118 aryl group Chemical group 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
- 238000004132 cross linking Methods 0.000 description 1
- 125000005442 diisocyanate group Chemical group 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
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- OETHQSJEHLVLGH-UHFFFAOYSA-N metformin hydrochloride Chemical compound Cl.CN(C)C(=N)N=C(N)N OETHQSJEHLVLGH-UHFFFAOYSA-N 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920001228 polyisocyanate Polymers 0.000 description 1
- 239000005056 polyisocyanate Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 238000010106 rotational casting Methods 0.000 description 1
- 150000005619 secondary aliphatic amines Chemical class 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 150000003510 tertiary aliphatic amines Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B3/00—Presses characterised by the use of rotary pressing members, e.g. rollers, rings, discs
- B30B3/005—Roll constructions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B3/00—Presses characterised by the use of rotary pressing members, e.g. rollers, rings, discs
- B30B3/04—Presses characterised by the use of rotary pressing members, e.g. rollers, rings, discs co-operating with one another, e.g. with co-operating cones
-
- 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
Definitions
- the invention is based on a press jacket, in particular for a press device for treating a fibrous web, e.g. for smoothing or dewatering it, as well as a corresponding method for producing such a press jacket, 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.
- the polyurethanes known to date from the prior art are still not able to achieve a stability and service life that is satisfactory for the customer in every application.
- These materials also have disadvantages in the manufacture of the press sleeves.
- the adjustment of the viscosity of the reaction mixture of prepolymer and crosslinker was problematic. If thicker individual layers per coating pass of the polymer layer were previously desired, this was not possible. Rather, a second coating pass had to be carried out.
- inclusions in the form of air bubbles often resulted as soon as the reinforcement structure, e.g. in the form of threads, was encased with the material. Such air bubbles can also arise in layers without a reinforcement structure. The problem with air bubbles is that they often lead to premature failure of the press jacket during operation.
- the pamphlet WO 2015/086555 A1 discloses a press cover in the form of an endless belt or hose for a shoe press roll, comprising at least one polymer layer, the polymer layer containing or being made from a polyurethane, the polyurethane being formed from a prepolymer and a crosslinker, and the prepolymer being a reaction product 1,4-phenylene diisocyanate (PPDI) and at least one polyol, and wherein the crosslinker comprises at least two components, namely a first component comprising diamine and a second component.
- PPDI 1,4-phenylene diisocyanate
- the present invention relates to such generic objects mentioned at the outset.
- the object of the invention to provide a press jacket and a method for its production which avoids the disadvantages of the prior art.
- the object is to provide a press cover which has increased stability and service life compared to the press cutters known from the prior art.
- the inventor has recognized that the object on which the invention is based can be achieved by using a crosslinker comprising a diamine and a carbonic acid ester, such as propylene carbonate or ethylene carbonate.
- a carbonic acid ester such as propylene carbonate or ethylene carbonate.
- the addition of a carbonic acid ester to the crosslinker in the production of a polyurethane-containing press jacket, especially by the method described in the Figure 3 is extremely unusual. This is because it is usually used as a solvent in the plastics industry for purposes that are outside of polyurethane production. It was surprisingly found that the prepolymer / crosslinker mixture had a lower viscosity with an optimal pot life at the same time.
- the resulting polymer which is initially of low viscosity, can soak the reinforcement structure (for example made of threads) particularly well before it solidifies as a result of curing. Particularly rough surfaces can also be wetted. In both cases, air bubbles can escape very well over time.
- almost bubble-free press jackets can therefore be produced by means of rotational molding, which allow polymer layers up to 40 mm thick - which can be produced in one coating pass, that is, monolithically.
- a press device means 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 rotating press cover and a standing one Press element, the so-called press shoe.
- the latter is supported on a load-bearing, also standing yoke - for example via hydraulic pressing 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.
- 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.
- press felts running continuously in the circumferential direction and / or further continuously running press belts 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 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, 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. This is left to the specialist depending on the application.
- a press jacket in the sense of the invention is to be understood as a belt, hose or jacket which, as shown, is guided together with a fibrous web through the press nip of a shoe press.
- the radially outermost surface (polymer layer) of the press jacket can come into contact with a press felt during normal operation, by which the fibrous web to be dewatered is directly supported.
- the press cover can also come into direct contact with the fibrous web during normal operation, for example to smooth it.
- the press jacket is designed as a closed jacket (hose) which is endless in the circumferential direction around its longitudinal axis.
- the press cover can be held at these axial ends by two lateral tensioning disks in order to form the shoe press roll.
- the press cover can be guided over the press shoe and several guide rollers, as is the case with open shoe presses. Regardless of whether the press cover is guided by the clamping disks or the guide rollers, the press shoe (or the guide rollers) comes into contact (temporarily) with part of the radially innermost surface of the press cover.
- 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 press jacket 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 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 casting, for example.
- 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 a single, preferably uniform layer results. The same applies to the finished press jacket.
- a plurality of polymer layers When a plurality of polymer layers are provided, they 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, 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 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 jacket within the meaning of the invention is one whose at least one polymer layer is cured and finally processed, i.e. ready for use in a shoe press, for example, for the purpose mentioned above.
- a finished polymer layer means a layer that has cured.
- the press cover has a reinforcement structure.
- 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 reinforce structures such as textile line structures - z. B. yarns or twisted threads - and / or textile fabrics - such. B.
- woven, knitted, knitted fabrics, braids or scrims - include and can be produced from a corresponding starting material, for example by winding.
- Starting material is understood to mean that material or semi-finished product by means of which the reinforcement structure of the finished press jacket according to the invention is produced.
- Such a reinforcement structure can be embedded in the polymer layer in or after step e) according to the method according to the invention. After being embedded in the corresponding polymer layer, the starting material thus forms the reinforcement structure of the finished press jacket according to the invention.
- the crosslinker comprises at least two components
- this is understood to mean exemplary embodiments which comprise exactly two, exactly three, exactly four or exactly five or more than five components.
- the crosslinker should be made from at least two components.
- the percentages of the two, three, four, five or more components can be chosen so that there are exactly two, three, four, five or more components.
- the percentages of each of the at least two components of the crosslinking agent can be selected so that their total sum does not exceed 100% by weight.
- the crosslinker in principle, it would be conceivable for the crosslinker to have a third component (K3) which is selected from at least one polyol, preferably bifunctional polyol, whose molecular weight is preferably 1,000 to 4,000 g / mol, such as polyester polyol, in particular polycaprolactone polyol; Polyether polyols, in particular polytetramethylene ether glycol (PTMEG), polypropylene glycol (PPG), polyethylene glycol (PEG), polyhexamethylene ether glycol, polycarbonate polyol, polyether carbonate polyol, polybutadiene polyol, perfluoropolyether polyol, silicone polyol or mixtures thereof.
- PTMEG polytetramethylene ether glycol
- PPG polypropylene glycol
- PEG polyethylene glycol
- polyhexamethylene ether glycol polycarbonate polyol
- polyether carbonate polyol polybutadiene polyol
- a fourth component (K4) is also added, which comprises a catalyst or is formed by it, the fourth component (K4) being selected is made from tertiary amines, such as 1,4-diazabicyclo (2.2.2) octane (DABCO), triethylamine, metal compounds, organometallic compounds - e.g. comprising or containing bismuth, such as bismuth neodecanoate, mercury, aluminum, zirconium, iron, calcium, sodium , Potassium, lead, tin, titanium - or mixtures of the aforementioned substances.
- tertiary amines such as 1,4-diazabicyclo (2.2.2) octane (DABCO), triethylamine, metal compounds, organometallic compounds - e.g. comprising or containing bismuth, such as bismuth neodecanoate, mercury, aluminum, zirconium, iron, calcium, sodium , Potassium, lead
- the reaction rate of the crosslinking - and thus the production process of the press jacket - can in principle be better controlled if such a catalyst is mixed with the crosslinker.
- the proportion of the catalyst can be reduced according to the invention. It would therefore be conceivable in principle to dispense with component K4, that is to say the catalyst.
- each of the named components could in turn consist of further sub-components.
- the substances according to the invention are preferably the components themselves.
- the components according to the invention can, for example, be added to the crosslinker in accordance with the process according to the invention before they are reacted with the prepolymer.
- the term "at most" based on a certain percentage of a component means that the proportion comprises at least> 0%, e.g. 0.01% or more, but no more than the certain percentage. If, for example, there is talk of "at most 15%", the interval between> 0% is always greater, for example. 0.01% and (exactly) 15% meant. In any case, all three, four, five or more components according to the invention are always and individually represented in the crosslinker. On the other hand, when it is said that "at least” e.g. 20% of a component is present, then 20 and more, i.e. up to 100% of the component are meant. The terms mentioned are to be supplemented by the corresponding molar or weight information.
- aliphatic amines When aliphatic amines are mentioned in the context of the invention, this can mean primary aliphatic amines, secondary aliphatic amines or tertiary aliphatic amines. In a preferred embodiment, however, the aliphatic amines are primary aliphatic amines, since this is the best way to achieve the advantages according to the invention. This applies analogously to aromatic amines as well as to (aromatic) diamines.
- the polyol of the prepolymer can preferably be selected from: polyester polyol, in particular polycaprolactone polyol, polyether polyol, in particular polytetramethylene ether glycol (PTMEG), polypropylene glycol (PPG), polyethylene glycol (PEG) or polyhexamethylene ether glycol; Polycarbonate polyol, polyether carbonate polyol, polybutadiene polyol or mixtures thereof.
- polyester polyol in particular polycaprolactone polyol
- polyether polyol in particular polytetramethylene ether glycol (PTMEG), polypropylene glycol (PPG), polyethylene glycol (PEG) or polyhexamethylene ether glycol
- PTMEG polytetramethylene ether glycol
- PPG polypropylene glycol
- PEG polyethylene glycol
- Polycarbonate polyol polyether carbonate polyol
- polybutadiene polyol polybutadiene polyol or mixtures thereof.
- the invention also relates to a shoe press roll for a shoe press for dewatering a fibrous web, the press roll having at least one press cover 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 a shoe press roll and a counter roll which together form or delimit a nip, the shoe press roll comprising a circumferential press cover, the press cover is designed according to the invention.
- the invention relates to the use of a press jacket according to the invention for a press, such as a shoe press, for dewatering a fibrous web, preferably a paper, cardboard, tissue or cellulose web.
- a shoe press 10 which in the present case comprises a shoe press roll 12 according to the invention 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, a standing yoke 18 carrying this 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. Due to the concave design of the shoe 16 on its side facing the counter roll 14, a comparatively long nip 22 results.
- 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 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 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.
- Fig. 2 shows a possible embodiment of the invention in a partially illustrated cross section along the longitudinal axis 20 ′ of the finished press jacket 20, which is not to scale.
- the (precisely) one polymer layer 20.1 of the press jacket 20 can be seen.
- the press jacket 20 it would be conceivable for the press jacket 20 to consist of several polymer layers arranged radially one above the other. For example, exactly two polymer layers would be conceivable, a radially inner (shown in dashed lines) 20.2 and a radially outermost polymer layer (shown in solid lines) 20.1.
- the multiple polymer layers could then be produced according to the invention.
- a reinforcement structure 20 ′′ is embedded in the at least one polymer layer 20.1. This is indicated by the hatched circles, which can be textile flat or line structures such as fibers.
- the reinforcement structure 20 ′′ is completely embedded in the polymer layer 20.1. That means that the The reinforcement structure 20 ′′ does not extend beyond the boundaries of the polymer layer 20.1 in which it is embedded.
- Fig. 3 shows in a highly schematic side view a device for producing a press jacket 20 according to the invention.
- the device is set up in such a way that it carries out the method according to the invention for producing the press jacket 20.
- the device has exactly one cylindrical winding mandrel 4, with a reinforcing structure 20 ′′ made of a starting material 20 ′′ being applied in a spiral to its radially outermost jacket surface.
- the illustration shows an initial stage of the manufacturing process.
- one end is for this purpose of the starting material 20 '''on a polymer which is arranged on the outer circumference of the winding mandrel 4.
- one end of the starting material 20''' could also rest or be applied directly to the winding mandrel 4 without a polymer initially being provided between the starting material 20 ′′ ′′ and the winding mandrel 4.
- the starting material 20 ′′ ′′ can be a flat textile structure or line 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 'runs perpendicularly into the plane of the drawing here.
- a casting material such as castable, curable elastomeric polymer, for example polyurethane, is applied from above to the radially outermost lateral surface of the winding mandrel 4 or to the starting material 20 '''via a line 5 through a casting nozzle 6.
- Such a casting material can be selected, for example with regard to its pot life and viscosity, in such a way 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 moved via a suitable, in Fig. 3 Guide not shown in more detail, parallel to the longitudinal axis 20 ′, guided along this relative to the winding mandrel 4.
- the starting material 20 ''' is unrolled and wound onto the rotating mandrel 4 to form coils.
- the casting material can be replaced by the starting material 20 ''' get through to the winding mandrel 4.
- the polymer forms a first, here radially innermost and preferably elastomeric polymer layer 20.1 of the press jacket, of which FIG Fig. 3 only part is shown.
- the casting material emerging from the casting nozzle 6 is 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 reaction product can comprise an isocyanate according to the invention and a polyol.
- the reaction product container prepolymer container
- it can be present, for example, in the form of a prepolymer made from the substances just mentioned.
- the crosslinker can be provided in a crosslinker container.
- the crosslinker comprises at least one first component K1 according to the invention and a second component K2 according to the invention.
- the crosslinker can also comprise a third component K3 according to the invention comprising at least one polyol and / or also a fourth component according to the invention, such as a catalyst.
- a fifth or further component would also be fundamentally conceivable.
- the crosslinker with its corresponding components can be mixed directly in the crosslinker container. It is also conceivable, however, that the device comprises a corresponding individual container for each of the components, which is connected to the crosslinker container in a flow-conducting manner via lines not shown in order to produce the crosslinker according to the invention in the crosslinker container.
- the prepolymer container and the crosslinker container are assigned to the device for producing a press jacket 20. They are connected in a flow-conducting manner to a mixing chamber (not shown) upstream of the pouring nozzle 6 in the direction of flow via lines also not shown.
- the prepolymer-crosslinker mixture is thus produced upstream and outside the casting nozzle 6, that is to say mixed in the mixing chamber. Independently of the production of the mixture, it is then applied to the surface of the winding mandrel 4 to form the at least one polymer layer 20.1 of the press jacket 20.
- an endless cylindrical tubular press jacket 20 which is closed around its longitudinal axis 20 'and whose inner circumference essentially corresponds to the outer circumference of the winding mandrel 4, is gradually produced over the width of the winding mandrel 4 .
- 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 single polymer layer shown there is (partially or completely) made of a polyurethane.
- the polyurethane is formed from a prepolymer according to the invention - which is a reaction product of at least one polyol with an isocyanate - and a crosslinker.
- the crosslinker includes, for example, the components mentioned at the beginning. However, it can also have further components known to the person skilled in the art.
- a particularly high stability of the press jacket 20 is achieved with regard to the mechanical and dynamic properties such as stability, surface hardness, resistance to pressure, temperature and hydrolysis as well as low swelling and lead to an extended service life of the same during operation.
- virtually bubble-free press jackets can be produced by means of the rotational molding process described in the figures, which enable polymer layers up to 40 mm thick in one coating pass.
- the reinforcement structure 20 ′′ of the at least one polymer layer 20.1, 20.2 could also be made up of several starting materials 20 ′′ ′′, laid one on top of the other in the radial direction, each running in the longitudinal axis direction and in the circumferential direction of the press jacket 20.
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- Polyurethanes Or Polyureas (AREA)
Description
Die Erfindung geht aus von einem Pressmantel, insbesondere für eine Pressvorrichtung zur Behandlung einer Faserstoffbahn, z.B. zu deren Glättung oder Entwässerung, sowie von einem entsprechenden Verfahren zur Herstellung eines solchen Pressmantels, im Einzelnen gemäß den unabhängigen Ansprüchen.The invention is based on a press jacket, in particular for a press device for treating a fibrous web, e.g. for smoothing or dewatering it, as well as a corresponding method for producing such a press jacket, in detail according to the independent claims.
Pressenvorrichtungen, wie Schuhpressen, sind seit langem Bestandteil moderner Papiermaschinen. Sie umfassen im Wesentlichen einen stationär angeordneten Schuh (auch Pressschuh genannt), welcher sich in einer Maschinenquerrichtung erstreckt und einen um den stationären Schuh umlaufenden Pressmantel. Letzter ist verformbar und nimmt im Betrieb im Wesentlichen eine rohrförmige Form an. Der Schuh ist so geformt, dass er mit einer Gegenwalze einen Pressnip (Pressspalt) bildet. Der Pressnip ist durch die Anlagefläche der Gegenwalze im Schuh definiert. Der Schuh ist beweglich ausgeführt und kann an die Gegenwalze bewegt werden.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.
An den Pressmantel werden enorme Anforderungen in Bezug auf seine Stabilität gestellt, nämlich hinsichtlich Oberflächenhärte, Beständigkeit gegen Druck, Temperatur und Hydrolyse. Der Pressmantel ist zudem während des Betriebs starken Biegewechselbelastungen ausgesetzt. Beim Einlaufen am Schuhrand - in Drehrichtung des Pressmantels gesehen vor dem Pressnip - erfolgt zunächst eine Biegung unter einem verhältnismäßig kleinen Radius. Diese geht sofort in eine gegenläufige Biegung beim Durchlaufen des Pressnips über. Beim Auslaufen am anderen Schuhrand, also - in Drehrichtung des Pressmantels gesehen nach dem Pressnip - erfolgt wieder eine gegenläufige Biegung. Diese Verformung des Pressmantels beim Ein- und Auslaufen wird auch als Wechselnip bezeichnet. Es ist leicht ersichtlich, dass die Neigung des Pressmantels, besonders an dieser Stelle zu brechen, durch die hohe mechanische Beanspruchung sehr groß ist. Entsprechend sind aus dem Stand der Technik viele Maßnahmen bekannt, die die Stabilität des Pressmantels erhöhen sollen.Enormous demands are placed on the press jacket with regard to its stability, namely with regard to surface hardness, resistance to pressure, temperature and hydrolysis. The press jacket is also exposed to strong alternating bending loads during operation. When entering the edge of the shoe - seen in the direction of rotation of the press jacket in front of the press nip - there is initially a bend under a relatively small radius. This immediately changes into a bend in the opposite direction when passing through the press nip. When it runs out at the other edge of the shoe, that is - after the press nip as seen in the direction of rotation of the press jacket - there is again an opposite bend. This deformation of the press jacket when it runs in and out is also referred to as a change nip. It is easy to see that the tendency of the press jacket to break, especially at this point, is very great due to the high mechanical stress. Correspondingly, many measures are known from the prior art that are intended to increase the stability of the press jacket.
Im Bereich der Materialien werden für Pressmäntel in zunehmendem Maße moderne Polymere, wie beispielsweise Polyurethane verwendet. Diese erlauben durch eine geeignete Zusammensetzung die Herstellung von Pressmänteln mit hoher Flexibilität und dabei großer Stabilität.In the field of materials, modern polymers, such as, for example, polyurethanes, are increasingly being used for press sleeves. With a suitable composition, these allow the production of press sleeves with high flexibility and high stability.
Bisherige aus dem Stand der Technik bekannte Polyurethane sind jedoch bis heute nicht im Stande in jedem Einsatzfall eine für den Kunden zufriedenstellende Stabilität und Lebensdauer zu erzielen. Auch bei der Herstellung der Pressmäntel haben diese Werkstoffe Nachteile. Einerseits war die Einstellung der Viskosität des Reaktionsgemisches aus Präpolymers und Vernetzer problematisch. Wurden bisher dickere Einzelschichten pro Beschichtungsdurchgang der Polymerschicht gewünscht, so war dies nicht möglich. Vielmehr musste ein zweiter Beschichtungsdurchgang erfolgen. Andererseits ergaben sich oft Einschlüsse in Form von Luftblasen, sobald die Verstärkungsstruktur z.B. in Form von Fäden, mit dem Werkstoff umgossen wurde. Auch in Schichten ohne Verstärkungsstruktur können solche Luftblasen entstehen. Problematisch an Luftblasen ist, dass diese oftmals zum vorzeitigen Ausfall des Pressmantels im Betrieb führen.However, the polyurethanes known to date from the prior art are still not able to achieve a stability and service life that is satisfactory for the customer in every application. These materials also have disadvantages in the manufacture of the press sleeves. On the one hand, the adjustment of the viscosity of the reaction mixture of prepolymer and crosslinker was problematic. If thicker individual layers per coating pass of the polymer layer were previously desired, this was not possible. Rather, a second coating pass had to be carried out. On the other hand, inclusions in the form of air bubbles often resulted as soon as the reinforcement structure, e.g. in the form of threads, was encased with the material. Such air bubbles can also arise in layers without a reinforcement structure. The problem with air bubbles is that they often lead to premature failure of the press jacket during operation.
Gattungsgemäße Pressmäntel sind aus
Die Druckschrift
Die vorliegende Erfindung betrifft derartige eingangs genannte, gattungsgemäße Gegenstände.The present invention relates to such generic objects mentioned at the outset.
Es ist entsprechend Aufgabe der Erfindung, einen Pressmantel und ein Verfahren zu dessen Herstellung anzugeben, welcher/welches die Nachteile des Standes der Technik vermeidet. Insbesondere liegt die Aufgabe darin, einen Pressmantel anzugeben, der eine gegenüber den aus dem Stand der Technik bekannten Pressmähteln erhöhte Stabilität und Lebensdauer aufweist.It is the object of the invention to provide a press jacket and a method for its production which avoids the disadvantages of the prior art. In particular, the object is to provide a press cover which has increased stability and service life compared to the press cutters known from the prior art.
Die Aufgabe wird durch die Merkmale der unabhängigen Ansprüche gelöst. Besonders bevorzugte und vorteilhafte Ausführungsformen der Erfindung sind in den Unteransprüchen wiedergegeben.The object is achieved by the features of the independent claims. Particularly preferred and advantageous embodiments of the invention are given in the subclaims.
Die Erfinderin hat erkannt, dass sich die der Erfindung zugrunde liegende Aufgabe durch die Verwendung eines Vernetzers umfassend ein Diamin und einen Kohlensäureester, wie Propylencarbonat oder Ethylencarbonat lösen lässt. Die Zugabe eines Kohlensäureesters zum Vernetzer bei der Herstellung eines Polyurethan enthaltenden Pressmantels, besonders nach dem Verfahren, das in der
Besonders im Zusammenspiel mit PPDI als Isocyanat ergeben sich zudem sehr vorteilhafte mechanische, wie dynamische Eigenschaften des Pressmantels, eine geringe Quellung sowie eine hervorragende Beständigkeit gegen Hydrolyse.Particularly in combination with PPDI as the isocyanate, there are also very advantageous mechanical and dynamic properties of the press jacket, low swelling and excellent resistance to hydrolysis.
Wenn gemäß der vorliegenden Erfindung die Rede von einem Isocyanat ist, dann ist damit ein Polyisocyanat, wie Diisocyanat gemeint.When an isocyanate is mentioned according to the present invention, then a polyisocyanate such as diisocyanate is meant.
Im Sinne der Erfindung ist mit einer Pressvorrichtung eine Schuhpresse z.B. zur Entwässerung oder Behandlung, wie Glättung einer Faserstoffbahn gemeint. Die Schuhpresse umfasst eine Schuhpresswalze und eine Gegenwalze, die zusammen einen Pressnip ausbilden oder begrenzen. Die Schuhpresswalze umfasst ferner einen umlaufenden Pressmantel und ein stehendes Presselement, den sogenannten Pressschuh. Letzterer stützt sich auf einem tragenden, ebenfalls stehenden Joch ab - beispielsweise über hydraulische Presselemente - und wird an den umlaufenden Pressmantel angedrückt. Der Pressmantel umläuft relativ zu dem feststehenden Pressschuh und Joch und wird dadurch im Pressnip an die Gegenwalze gepresst. Pressschuh und Joch sind radial innerhalb des Pressmantels angeordnet. Unter dem Begriff stehend wird verstanden, dass das Presselement nicht relativ zu der Schuhpresswalze oder der Gegenwalze umläuft, sich jedoch translatorisch - auf die Gegenwalze zu und von ihr weg, bevorzugt in Radialrichtung dieser - und damit relativ zu der Gegenwalze bewegen kann. Zusätzlich zur Faserstoffbahn und dem Pressmantel können ein oder mehrere in Umfangsrichtung endlos umlaufende Pressfilze und/oder weitere endlos umlaufende Pressbänder durch den Pressnip der Schuhpresse geführt werden. Eine solche Schuhpresse kann selbstverständlich mehr als einen Pressnip umfassen.In the context of the invention, a press device means 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 rotating press cover and a standing one Press element, the so-called press shoe. The latter is supported on a load-bearing, also standing yoke - for example via hydraulic pressing 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. In addition to the fibrous web and the press cover, one or more press felts running continuously in the circumferential direction and / or further continuously running press belts can be guided through the press nip of the shoe press. Such a shoe press can of course comprise more than one press nip.
Unter einer Faserstoffbahn im Sinne der Erfindung ist ein Gelege bzw. Gewirre von Fasern, wie Holzfasern, Kunststofffasern, Glasfasern, Kohlenstofffasern, Zusatzstoffen, Additiven oder dergleichen zu verstehen. So kann die Faserstoffbahn beispielsweise als Papier-, Karton- oder Tissuebahn ausgebildet sein. Sie kann im Wesentlichen Holzfasern umfassen, wobei geringe Mengen anderer Fasern oder auch Zusatzstoffe und Additive vorhanden sein können. Dies bleibt je nach Einsatzfall dem Fachmann überlassen.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, or the like. For example, 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. This is left to the specialist depending on the application.
Unter einem Pressmantel im Sinne der Erfindung ist ein Band, Schlauch oder ein Mantel zu verstehen, das/der wie dargestellt, zusammen mit einer Faserstoffbahn durch den Pressnip einer Schuhpresse geführt wird. Zur Entwässerung der Faserstoffbahn kann im bestimmungsgemäßen Betrieb die radial äußerste Oberfläche (Polymerschicht) des Pressmantels mit einem Pressfilz in Kontakt kommen, von dem die zu entwässernde Faserstoffbahn direkt getragen wird. Je nach Ausführungsform der Presseinrichtung kann z.B. zur Glättung dieser der Pressmantel im bestimmungsgemäßen Betrieb auch direkt mit der Faserstoffbahn in Kontakt kommen. Der Pressmantel ist dabei als ein in Umfangsrichtung um dessen Längsachse endloser, geschlossener Mantel (Schlauch) ausgeführt. An seinen axialen Enden ist er - in Breitenrichtung gesehen (entlang der Längsachse) - offen. Damit kann der Pressmantel an diesen axialen Enden von zwei seitlichen Spannscheiben gehalten werden, um die Schuhpresswalze zu bilden. Anstatt der Führung durch die beiden seitlichen Spannscheiben kann der Pressmantel, wie es bei offenen Schuhpressen der Fall ist, über den Pressschuh und mehrere Leitwalzen geführt werden. Unabhängig davon, ob der Pressmantel von den Spannscheiben oder den Leitwalzen geführt ist, gelangt der Pressschuh (bzw. die Leitwalzen) mit einem Teil der radial innersten Oberfläche des Pressmantels (zeitweise) in Kontakt. Die radial äußerste Oberfläche eines solchen Pressmantels, also z.B. die radial äußerste Polymerschicht desselben kann mit Rillen und/oder Blindbohrungen versehen sein.A press jacket in the sense of the invention is to be understood as a belt, hose or jacket which, as shown, is guided together with a fibrous web through the press nip of a shoe press. To dewater the fibrous web, the radially outermost surface (polymer layer) of the press jacket can come into contact with a press felt during normal operation, by which the fibrous web to be dewatered is directly supported. Depending on the embodiment of the pressing device, the press cover can also come into direct contact with the fibrous web during normal operation, for example to smooth it. The press jacket is designed as a closed jacket (hose) which is endless in the circumferential direction around its longitudinal axis. To his axial ends it is - viewed in the width direction (along the longitudinal axis) - open. 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. Regardless of whether the press cover is guided by the clamping disks or the guide rollers, the press shoe (or the guide rollers) comes into contact (temporarily) with part of the radially innermost surface of the press cover. 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.
Der Pressmantel kann teilweise oder vollständig aus einem Polymer hergestellt sein. Als Polymer kann dabei ein gießbares, aushärtbares, bevorzugt elastomeres Polymer wie Polyurethan eingesetzt werden. Das Polymer kann folglich als Gießelastomer eingestellt sein.The press jacket 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.
Mit Polymerschicht ist eine Schicht gemeint, die ein solches gießbares, aushärtbares, bevorzugt elastomeres Polymer umfasst oder vollständig daraus hergestellt ist. Bevorzugt kann die Polymerschicht eine einteilig durch Urformen hergestellte, ausgehärtete Schicht sein. Anders ausgedrückt ist diese monolithisch urgeformt, also durch z.B. Gießen hergestellt. Der Begriff einteilig schließt auch Fälle ein, in denen die eine Schicht wiederum beim Gießen des Polymers aus mehreren Lagen gleichen Materials hergestellt wurde. Dies jedoch nur insoweit wie diese Lagen nach dem Aushärten im Wesentlichen nicht mehr sichtbar sind, sondern sich eine einzige, bevorzugt einheitliche Schicht ergibt. Selbiges gilt entsprechend für den fertigen Pressmantel.By 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 casting, for example. 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 a single, preferably uniform layer results. The same applies to the finished press jacket.
Bei Vorsehen mehrerer Polymerschichten können diese in Radialrichtung gesehen - zumindest abschnittsweise über die Breite des Pressmantels - übereinander angeordnet sein. Zumindest abschnittsweise über der Breite des Pressmantels bedeutet, dass der Pressmantel z.B. an dessen axialen Enden nur einschichtig ist, wohingegen er zwischen den axialen Enden zwei- oder mehrschichtig ausgebildet ist. Die Polymerschichten können sich jedoch auch über die gesamte Breite des Pressmantels erstrecken. Auch kann die Dicke des Pressmantels - und somit die Dicke der einzelnen Polymerschichten - in einem Schnitt durch dessen Längsachse abschnittsweise entlang der Längsachse variieren. So kann z.B. die radial äußerste Polymerschicht im Bereich der Breitenränder des Pressmantels geringer sein als in der Mitte des Pressmantels. Anders ausgedrückt kann im Bereich der Breitenränder die radial äußerste Polymerschicht weniger dick sein als eine radial innere oder radial innerste Polymerschicht. Bevorzugt ist/sind genau eine, zwei oder drei Polymerschichten vorgesehen. Diese können hinsichtlich ihres Polymers identisch ausgeführt sein oder hinsichtlich ihrer Härte oder Stöchiometrie des Präpolymers variieren. Eine Gesamtdicke des fertigen Pressmantels in einem Schnitt durch die Längsachse desselben in Radialrichtung gemessen kann 5 bis 10 mm, bevorzugt 5 bis 7, besonders bevorzugt 5 bis 6 mm betragen. Gemäß der Erfindung kann bei Vorsehen einer einzigen Schicht der Pressmantel aus nur einem Guss, d.h. monolithisch hergestellt sein, sodass die einzige Schicht die eben genannte Dicke aufweist.When a plurality of polymer layers are provided, they 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, whereas it is formed in two or more layers between the axial ends. However, 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. For example, 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. In other words, 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. According to the invention, 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.
Ein fertiger Pressmantel im Sinne der Erfindung ist ein solcher, dessen wenigstens eine Polymerschicht ausgehärtet und abschließend bearbeitet, also für den eingangs genannten Zweck in z.B. einer Schuhpresse einsatzbereit ist. Analog ist mit fertiger Polymerschicht eine Schicht gemeint, die ausgehärtet ist.A finished press jacket within the meaning of the invention is one whose at least one polymer layer is cured and finally processed, i.e. ready for use in a shoe press, for example, for the purpose mentioned above. Similarly, a finished polymer layer means a layer that has cured.
Grundsätzlich ist es denkbar, dass der Pressmantel eine Verstärkungsstruktur aufweist. Mit dem Begriff Verstärkungsstruktur im Sinne der Erfindung ist eine Verstärkung der wenigstens einen, das Polymer enthaltenden oder aus diesem bestehenden Schicht - also der Polymerschicht - gemeint. Dabei kann die Verstärkungsstruktur vollständig in die Polymerschicht eingebettet sein, sodass die Verstärkungsstruktur nicht über die Begrenzung der Polymerschicht hinausgeht. Anders ausgedrückt übernimmt die Polymerschicht die Rolle einer Matrix, welche die Verstärkungsstruktur umgibt und infolge von Adhäsions- oder Kohäsionskräften an die Matrix bindet. Eine solche Verstärkungsstruktur kann Verstärkungsstrukturen, wie textile Liniengebilde - z. B. Garne oder Zwirne - und/oder textile Flächengebilde - wie z. B. Gewebe, Gewirke, Gestricke, Geflechte oder Gelege - umfassen und aus einem entsprechenden Ausgangsmaterial, z.B. durch Wickeln herstellbar sein. Unter Ausgangsmaterial wird jenes Material oder Halbzeug verstanden, mittels dem die Verstärkungsstruktur des erfindungsgemäßen fertigen Pressmantels hergestellt wird. Eine solche Verstärkungsstruktur kann gemäß dem erfindungsgemäßen Verfahren im oder nach dem Schritt e) in die Polymerschicht eingebettet werden. Das Ausgangsmaterial bildet damit nach Einbettung in die entsprechende Polymerschicht die Verstärkungsstruktur des erfindungsgemäßen fertigen Pressmantels aus.In principle, it is conceivable that the press cover has a reinforcement structure. The term 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. In other words, 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 reinforce structures such as textile line structures - z. B. yarns or twisted threads - and / or textile fabrics - such. B. woven, knitted, knitted fabrics, braids or scrims - include and can be produced from a corresponding starting material, for example by winding. Starting material is understood to mean that material or semi-finished product by means of which the reinforcement structure of the finished press jacket according to the invention is produced. Such a reinforcement structure can be embedded in the polymer layer in or after step e) according to the method according to the invention. After being embedded in the corresponding polymer layer, the starting material thus forms the reinforcement structure of the finished press jacket according to the invention.
Wenn im Sinne der Erfindung davon die Rede ist, dass der Vernetzer zumindest zwei Komponenten umfasst, so sind darunter Ausführungsbeispiele zu verstehen, die genau zwei, genau drei, genau vier oder genau fünf oder mehr als fünf Komponenten umfassen. Gemäß der Erfindung soll der Vernetzer aus zumindest zwei Komponenten hergestellt sein. Selbstverständlich können die Prozentanteile der zwei, drei, vier, fünf oder mehr Komponenten so gewählt sein, dass genau zwei, drei, vier, fünf oder mehr Komponenten vorliegen. Die Prozentanteile jeder der zumindest zwei Komponenten des Vernetzers können so gewählt werden, dass sie in ihrer Gesamtsumme nicht über 100 Gew.-% hinausgehen.If, in the context of the invention, it is said that the crosslinker comprises at least two components, this is understood to mean exemplary embodiments which comprise exactly two, exactly three, exactly four or exactly five or more than five components. According to the invention, the crosslinker should be made from at least two components. Of course, the percentages of the two, three, four, five or more components can be chosen so that there are exactly two, three, four, five or more components. The percentages of each of the at least two components of the crosslinking agent can be selected so that their total sum does not exceed 100% by weight.
Grundsätzlich wäre es denkbar, dass der Vernetzer eine dritte Komponente (K3) aufweist, welche ausgewählt ist aus wenigstens einem Polyol, bevorzugt bifunktionellem Polyol, dessen Molekulargewicht bevorzugt 1.000 bis 4.000 g/mol beträgt, wie Polyesterpolyol, insbesondere Polycaprolactonpolyol; Polyetherpolyole, insbesondere Polytetramethylenetherglycol (PTMEG), Polypropylenglycol (PPG), Polyethylenglycol (PEG) Polyhexamethylenetherglycol, Polycarbonatpolyol, Polyethercarbonatpolyol, Polybutadienepolyol, Perfluoropolyetherpolyol, Silikonpolyol oder Mischungen daraus.In principle, it would be conceivable for the crosslinker to have a third component (K3) which is selected from at least one polyol, preferably bifunctional polyol, whose molecular weight is preferably 1,000 to 4,000 g / mol, such as polyester polyol, in particular polycaprolactone polyol; Polyether polyols, in particular polytetramethylene ether glycol (PTMEG), polypropylene glycol (PPG), polyethylene glycol (PEG), polyhexamethylene ether glycol, polycarbonate polyol, polyether carbonate polyol, polybutadiene polyol, perfluoropolyether polyol, silicone polyol or mixtures thereof.
Auch wäre es alternativ denkbar, dass zusätzlich zu den drei eben genannten Komponenten auch eine vierte Komponente (K4) hinzukommt, die einen Katalysator umfasst oder von diesem gebildet wird, wobei die vierte Komponente (K4) ausgewählt ist aus tertiären Aminen, wie 1,4-Diazabicyclo(2.2.2)octan (DABCO), Triethylamin, Metallverbindungen, organometallischen Verbindungen - z.B. umfassend oder enthaltend Bismuth, wie Bismuth-Neodecanoat, Quecksilber, Aluminium, Zirconium, Eisen, Kalzium, Natrium, Kalium, Blei, Zinn, Titan - oder Mischungen aus den vorgenannten Stoffen. Mittels eines Katalysators kann grundsätzlich die Reaktionsgeschwindigkeit der Vernetzung - und damit der Herstellprozess des Pressmantels - besser gesteuert werden, wenn ein solcher dem Vernetzer zugemischt wird. Durch den Zusatz der Wasserstoffatome tragenden aktiven Moleküle kann gemäß der Erfindung der Anteil des Katalysators reduziert werden. Daher wäre es grundsätzlich denkbar, auf die Komponente K4, also den Katalysator zu verzichten.Alternatively, it would also be conceivable that, in addition to the three components just mentioned, a fourth component (K4) is also added, which comprises a catalyst or is formed by it, the fourth component (K4) being selected is made from tertiary amines, such as 1,4-diazabicyclo (2.2.2) octane (DABCO), triethylamine, metal compounds, organometallic compounds - e.g. comprising or containing bismuth, such as bismuth neodecanoate, mercury, aluminum, zirconium, iron, calcium, sodium , Potassium, lead, tin, titanium - or mixtures of the aforementioned substances. By means of a catalyst, the reaction rate of the crosslinking - and thus the production process of the press jacket - can in principle be better controlled if such a catalyst is mixed with the crosslinker. By adding the active molecules carrying hydrogen atoms, the proportion of the catalyst can be reduced according to the invention. It would therefore be conceivable in principle to dispense with component K4, that is to say the catalyst.
Dennoch werden besonders gute Ergebnisse, die die eingangs genannten Vorteile mehr als zufriedenstellend erfüllen, ergeben sich dann, wenn der Vernetzer 0,01% bis 5 % mol der vierten Komponente (K4) enthält.Nevertheless, particularly good results which more than satisfactorily meet the advantages mentioned at the outset are obtained when the crosslinking agent contains 0.01% to 5% mol of the fourth component (K4).
Das bereits zu genau zwei Komponenten Gesagte gilt auch hier analog: Die Prozentanteile jeder der genau drei, vier oder genau fünf Komponenten können so gewählt werden, dass sie in ihrer Gesamtsumme nicht über 100 Gew.-% hinausgehen. Anders ausgedrückt bedeutet dies, dass eben genau drei oder genau vier oder genau fünf Komponenten im Vernetzer vorhanden sind.What has already been said about exactly two components also applies here analogously: The percentages of each of the precisely three, four or exactly five components can be selected so that their total does not exceed 100% by weight. In other words, this means that there are exactly three or exactly four or exactly five components in the crosslinker.
Unabhängig von den genannten Alternativen, also z.B. ob der Vernetzer aus genau zwei, drei, genau vier oder genau fünf oder mehr Komponenten hergestellt ist oder solche umfasst, könnte jede der genannten Komponenten ihrerseits aus weiteren Unterkomponenten bestehen. Bevorzugt jedoch sind die erfindungsgemäßen Stoffe selbst die Komponenten.Regardless of the alternatives mentioned, e.g. whether the crosslinker is made from exactly two, three, exactly four or exactly five or more components or comprises such, each of the named components could in turn consist of further sub-components. However, the substances according to the invention are preferably the components themselves.
Wenn gemäß der Erfindung von "wenigstens" einer Komponente des Vernetzer gesprochen wird, dann ist damit einerseits genau eine oder mehr als eine solche, also mehrere entsprechende Komponenten gemeint.When “at least” one component of the crosslinking agent is spoken of according to the invention, then on the one hand exactly one or more than one, that is to say several corresponding components, is meant.
Die erfindungsgemäßen Komponenten können z.B. gemäß dem erfindungsgemäßen Verfahren dem Vernetzer zugegeben werden, bevor sie mit dem Präpolymer reagiert werden.The components according to the invention can, for example, be added to the crosslinker in accordance with the process according to the invention before they are reacted with the prepolymer.
Mit dem Begriff "höchstens" bezogen auf einen bestimmten Prozentsatz einer Komponente ist gemeint, dass der Anteil zumindest > 0 %, also z.B. 0,01 % oder mehr, jedoch maximal den bestimmten Prozentsatz umfasst. Ist z.B. die Rede von "höchstens 15 %", so ist damit stets das Intervall zwischen > 0 %, also z.B. größer. 0,01 % und (genau) 15 % gemeint. Somit sind in jedem Fall alle drei, vier, fünf oder mehr Komponenten gemäß der Erfindung stets und einzeln in dem Vernetzer vertreten. Andererseits, wenn davon die Rede ist, das "zumindest" z.B. 20% einer Komponente vorhanden sind, dann sind also 20 und mehr, also bis zu 100% der Komponente gemeint. Die genannten Begriffe sind um die entsprechende Mol- oder Gewichtsangabe zu ergänzen.The term "at most" based on a certain percentage of a component means that the proportion comprises at least> 0%, e.g. 0.01% or more, but no more than the certain percentage. If, for example, there is talk of "at most 15%", the interval between> 0% is always greater, for example. 0.01% and (exactly) 15% meant. In any case, all three, four, five or more components according to the invention are always and individually represented in the crosslinker. On the other hand, when it is said that "at least" e.g. 20% of a component is present, then 20 and more, i.e. up to 100% of the component are meant. The terms mentioned are to be supplemented by the corresponding molar or weight information.
Wenn im Sinne der Erfindung von aliphatischen Aminen die Rede ist, dann können darunter primäre aliphatische Amine, sekundäre aliphatische Amine oder tertiäre aliphatische Amine gemeint sein. In einer bevorzugten Ausführungsform sind die aliphatischen Amine jedoch primäre aliphatische Amine, da sich hiermit die erfindungsgemäßen Vorteile am besten einstellen. Dies gilt analog für aromatische Amine als auch für (aromatische) Diamine.When aliphatic amines are mentioned in the context of the invention, this can mean primary aliphatic amines, secondary aliphatic amines or tertiary aliphatic amines. In a preferred embodiment, however, the aliphatic amines are primary aliphatic amines, since this is the best way to achieve the advantages according to the invention. This applies analogously to aromatic amines as well as to (aromatic) diamines.
Bevorzugt kann das Polyol des Präpolymers ausgewählt sein aus: Polyesterpolyol, insbesondere Polycaprolactonpolyol, Polyetherpolyol, insbesondere Polytetramethylenetherglycol (PTMEG), Polypropylenglycol (PPG), Polyethylenglycol (PEG) oder Polyhexamethylenetherglycol; Polycarbonatpolyol, Polyethercarbonatpolyol, Polybutadienepolyol oder Mischungen daraus. Hierdurch lassen sich die mechanischen und dynamischen Eigenschaften des erfindungsgemäßen Pressmantels zusätzlich zu dessen guter Herstellbarkeit verbessern.The polyol of the prepolymer can preferably be selected from: polyester polyol, in particular polycaprolactone polyol, polyether polyol, in particular polytetramethylene ether glycol (PTMEG), polypropylene glycol (PPG), polyethylene glycol (PEG) or polyhexamethylene ether glycol; Polycarbonate polyol, polyether carbonate polyol, polybutadiene polyol or mixtures thereof. In this way, the mechanical and dynamic properties of the press jacket according to the invention can be improved in addition to its good producibility.
Die Erfinderin hat festgestellt, dass ein Pressmantel umfassend wenigstens eine Polymerschicht, wobei die Polymerschicht ein Polyurethan enthält oder aus diesem hergestellt ist, im verblüffenden Maße die erfindungsgemäßen Vorteile zeigt, wenn er wie folgt ausgebildet wird:
- das Polyurethan ist gebildet aus einem Präpolymer und einem Vernetzer, und das Präpolymer ist ein Reaktionsprodukt aus 1,4-Phenylendiisocyanat (PPDI) und einem Polyol, wobei der Vernetzer genau vier Komponenten umfasst, nämlich:
- eine erste Komponente (K1) umfassend 25 bis 95 Gew.-% MCDEA als Diamin
- eine zweite Komponente (K2) umfassend 1 bis 25 Gew.-% Propylencarbonat aus der Gruppe der Kohlensäureester, und
- eine dritte Komponente (K3), umfassend höchstens 65 Gew.-% wenigstens eines Polyols.
- the polyurethane is formed from a prepolymer and a crosslinker, and the prepolymer is a reaction product of 1,4-phenylene diisocyanate (PPDI) and a polyol, the crosslinker comprising exactly four components, namely:
- a first component (K1) comprising 25 to 95% by weight of MCDEA as diamine
- a second component (K2) comprising 1 to 25% by weight propylene carbonate from the group of carbonic acid esters, and
- a third component (K3) comprising at most 65% by weight of at least one polyol.
Die Erfindung betrifft auch eine Schuhpresswalze für eine Schuhpresse zur Entwässerung einer Faserstoffbahn, wobei die Presswalze wenigstens einen erfindungsgemäßen Pressmantel aufweist. Auch betrifft die Erfindung eine Schuhpresse zur Entwässerung einer Faserstoffbahn, bevorzugt einer Papier-, Karton-, Tissue- oder Zellstoffbahn, umfassend eine Schuhpresswalze und eine Gegenwalze, die zusammen einen Nip ausbilden oder begrenzen, wobei die Schuhpresswalze einen umlaufenden Pressmantel umfasst, wobei der Pressmantel gemäß der Erfindung ausgebildet ist.The invention also relates to a shoe press roll for a shoe press for dewatering a fibrous web, the press roll having at least one press cover 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 a shoe press roll and a counter roll which together form or delimit a nip, the shoe press roll comprising a circumferential press cover, the press cover is designed according to the invention.
Schließlich betrifft die Erfindung die Verwendung eines erfindungsgemäßen Pressmantels für eine Presse, wie Schuhpresse zur Entwässerung einer Faserstoffbahn, bevorzugt einer Papier-, Karton-, Tissue- oder Zellstoffbahn.Finally, the invention relates to the use of a press jacket according to the invention for a press, such as a shoe press, for dewatering a fibrous web, preferably a paper, cardboard, tissue or cellulose web.
Die Erfindung wird nachfolgend unter Bezugnahme auf die Zeichnungen ohne Einschränkung der Allgemeinheit näher erläutert. In den Zeichnungen zeigen:
- Fig. 1
- eine teilgeschnittene, schematische Seitenansicht einer Schuhpresse mit einem Pressmantel gemäß eines Ausführungsbeispiels der vorliegenden Erfindung.
- Fig. 2
- eine schematische, teilgeschnittene und vergrößerte Darstellung eines Ausführungsbeispiels eines Pressmantels in einen Querschnitt durch dessen Längsachse gesehen;
- Fig. 3
- eine stark schematisierte Darstellung der Durchführung des erfindungsgemäßen Verfahrens in einer Seitenansicht auf eine Vorrichtung zur Herstellung des Pressmantels.
- Fig. 1
- a partially sectioned, schematic side view of a shoe press with a press cover according to an embodiment of the present invention.
- Fig. 2
- a schematic, partially sectioned and enlarged view of an embodiment of a press jacket in a cross section through its longitudinal axis;
- Fig. 3
- a highly schematic representation of the implementation of the method according to the invention in a side view of a device for producing the press jacket.
In der
Während die Gegenwalze 14 hier aus einer um ihre Längsachse rotierenden zylindrisch ausgestalteten Walze besteht, ist die Schuhpresswalze 12 aus einem Schuh 16, einem diesen tragenden stehenden Joch 18 und einem Pressmantel 20 zusammengesetzt. Schuh 16 und Joch 18 sind in Bezug auf die Gegenwalze 14 bzw. den Pressmantel 20 feststehend angeordnet. Das bedeutet, sie rotieren nicht. Dabei wird der Schuh 16 durch das Joch 18 abgestützt und über nicht dargestellte, hydraulische Presselemente an die radial innerste Oberfläche des relativ dazu umlaufenden Pressmantels 20 angepresst. Der Pressmantel 20, der Schuh 16 und Joch 18 in Umfangsrichtung umgibt, dreht sich dabei um seine Längsachse im entgegengesetzten Drehsinn zu der Gegenwalze 14. Aufgrund der konkaven Ausgestaltung des Schuhs 16 an seiner der Gegenwalze 14 zugewandten Seite ergibt sich ein vergleichsweise langer Nip 22.While the
Die Schuhpresse 10 eignet sich insbesondere zur Entwässerung von Faserstoffbahnen 24. Bei dem Betrieb der Schuhpresse wird eine Faserstoffbahn 24 mit einem oder zwei Pressfilzen 26, 26' durch den Pressspalt 22 geführt. Im vorliegenden Fall sind es genau zwei Pressfilze 26, 26', die die Faserstoffbahn 24 sandwichartig zwischen sich aufnehmen. Beim Durchgang durch den Nip 22 wird im Nip 22 auf die Faserstoffbahn 24 durch die Pressfilze 26, 26' mittelbar ein Druck ausgeübt. Dies geschieht dadurch, dass die radial äußerste Oberfläche der Gegenwalze 14 einerseits und die radial äußerste Oberfläche des Pressmantels 20 unmittelbar mit den entsprechenden Pressfilzen 26, 26' in Kontakt kommen. Die aus der Faserstoffbahn 24 austretende Flüssigkeit wird von dem bzw. den Pressfilzen 26, 26' und etwaigen in der Pressmanteloberfläche vorgesehen Vertiefungen (nicht dargestellt) vorübergehend aufgenommen. Nach dem Verlassen des Nips 22 wird die von den Vertiefungen des Pressmantels 20 aufgenommene Flüssigkeit abgeschleudert, bevor der Pressmantel 20 erneut in den Presspalt 22 eintritt. Zudem kann das von dem Pressfilz 26, 26' aufgenommene Wasser nach dem Verlassen des Pressspalts 22 mit Saugelementen entfernt werden.The
Vorliegend ist in die wenigstens einen Polymerschicht 20.1 eine Verstärkungsstruktur 20" eingebettet. Dies ist durch die schraffierten Kreise, die textile Flächen- bzw. Liniengebilde wie Fasern sein können, angedeutet. Die Verstärkungsstruktur 20" ist vollständig in die Polymerschicht 20.1 eingebettet. Das bedeutet, dass sich die Verstärkungsstruktur 20" nicht über die Begrenzungen der Polymerschicht 20.1, in die sie eingebettet ist, hinauserstreckt.In the present case, a
Der Wickeldorn 4 ist um seine Längsachse 20', die der Längsachse des herzustellenden Pressmantels entspricht, rotierbar gelagert. Längsachse 20' verläuft hier senkrecht in die Zeichenebene hinein. Über eine Leitung 5 wird durch einen Gießdüse 6 ein Gießmaterial, wie gießfähiges, aushärtbares elastomeres Polymer, z.B. Polyurethan, von oben auf die radial äußerste Mantelfläche des Wickeldorns 4 bzw. auf das Ausgangsmaterial 20''' gegeben. Ein solches Gießmaterial kann z.B. hinsichtlich seiner Topfzeit und Viskosität derart gewählt werden, dass es beim Gießen nicht vom Wickeldorn 4 heruntertropft. Währenddessen wird der Wickeldorn 4 in Pfeilrichtung um dessen Längsachse gedreht. Gleichzeitig mit dieser Drehung wird die Gießdüse 6 über eine geeignete, in
Das aus der Gießdüse 6 austretende Gießmaterial ist ein Gemisch aus einem Präpolymer und einem Vernetzer. Ersteres wird aus einem nicht gezeigten Präpolymer-Behälter bereitgestellt, in dem es gespeichert oder angerührt wird. Das Reaktionsprodukt kann ein erfindungsgemäßes Isocyanat und ein Polyol umfassen. In dem Reaktionsprodukt-Behälter (Präpolymer-Behälter) kann es zum Beispiel in Form eines Präpolymers aus den eben genannten Stoffen vorliegen.The casting material emerging from the casting nozzle 6 is 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 reaction product can comprise an isocyanate according to the invention and a polyol. In the reaction product container (prepolymer container) it can be present, for example, in the form of a prepolymer made from the substances just mentioned.
Der Vernetzer kann in einem Vernetzer-Behälter bereitgestellt werden. Der Vernetzer umfasst zumindest eine erfindungsgemäße erste Komponente K1 und eine erfindungsgemäße zweite Komponente K2. Der Vernetzer kann aber auch eine erfindungsgemäße dritte Komponente K3 umfassend wenigstens ein Polyol und/oder auch eine erfindungsgemäße vierte Komponente, wie einen Katalysator umfassen. Auch eine fünfte oder weitere Komponenten wären grundsätzlich denkbar. Der Vernetzer mit seinen entsprechenden Komponenten kann direkt im Vernetzer-Behälter angerührt werden. Denkbar ist, jedoch auch, dass die Vorrichtung für jede der Komponenten einen entsprechenden Einzelbehälter umfasst, der über nicht dargestellte Leitungen strömungsleitend mit dem Vernetzer-Behälter verbunden ist, um den erfindungsgemäßen Vernetzer im Vernetzer-Behälter herzustellen.The crosslinker can be provided in a crosslinker container. The crosslinker comprises at least one first component K1 according to the invention and a second component K2 according to the invention. However, the crosslinker can also comprise a third component K3 according to the invention comprising at least one polyol and / or also a fourth component according to the invention, such as a catalyst. A fifth or further component would also be fundamentally conceivable. The crosslinker with its corresponding components can be mixed directly in the crosslinker container. It is also conceivable, however, that the device comprises a corresponding individual container for each of the components, which is connected to the crosslinker container in a flow-conducting manner via lines not shown in order to produce the crosslinker according to the invention in the crosslinker container.
Präpolymer-Behälter und Vernetzer-Behälter sind der Vorrichtung zur Herstellung eines Pressmantels 20 zugeordnet. Sie sind über ebenfalls nicht dargestellte Leitungen strömungsleitend mit einer der Gießdüse 6 in Strömungsrichtung vorgeschalteten Mischkammer (nicht dargestellt) verbunden. Das Präpolymer-Vernetzer-Gemisch wird also stromauf und außerhalb der Gießdüse 6 hergestellt, also in der Mischkammer gemischt. Unabhängig von der Herstellung des Gemisches wird dieses dann auf die Oberfläche des Wickeldorns 4 zum Bilden der zumindest einen Polymerschicht 20.1 des Pressmantels 20 aufgebracht.The prepolymer container and the crosslinker container are assigned to the device for producing a
Mittels eines solchen kontinuierlichen Gießvorgangs, der auch als Rotationsguss bekannt ist, wird also nach und nach über die Breite des Wickeldorns 4 ein endloser, um dessen Längsachse 20' in sich geschlossener zylinderrohrförmiger Pressmantel 20 hergestellt, dessen Innenumfang im Wesentlichen dem Außenumfang des Wickeldorns 4 entspricht.By means of such a continuous casting process, which is also known as rotational casting, an endless cylindrical
Grundsätzlich wäre es denkbar das Ausgangsmaterial 20''' auf mehr als den einen in
Unabhängig von der angesprochenen Ausführungsform wird der fertige Pressmantel 20 schließlich von dem wenigstens einen Wickeldorn 4 abgenommen.Regardless of the embodiment mentioned, the
Wie in den Figuren dargestellt, ist der Pressmantel 20 gemäß der Erfindung ausgeführt. Das bedeutet, dass die dort gezeigte einzige Polymerschicht (teilweise oder vollständig) aus einem Polyurethan hergestellt ist. Das Polyurethan ist dabei aus einem erfindungsgemäßen Präpolymer - das ein Reaktionsprodukt aus wenigstens einem Polyol mit einem Isocyanat ist - und einem Vernetzer gebildet. Der Vernetzer umfasst z.B. die eingangs genannten Komponenten. Es kann aber auch weitere, dem Fachmann bekannte Komponenten aufweisen.As shown in the figures, the
Mittels der Erfindung wird eine besonders hohe Stabilität des Pressmantels 20 hinsichtlich der mechanischen und dynamischen Eigenschaften wie Stabilität, Oberflächenhärte, Beständigkeit gegen Druck, Temperatur und Hydrolyse sowie einer geringen Quellung und führen im Betrieb zu einer verlängerten Lebensdauer desselben erzielt. Gleichzeitig können mittels des in den Fig. beschriebenen Rotationsgussverfahrens nahezu blasenfreie Pressmäntel hergestellt werden, die bis zu 40 mm dicke Polymerschichten in einem Beschichtungsdurchgang ermöglichen. Obwohl dies nicht in den Figuren dargestellt ist, könnte die Verstärkungsstruktur 20" der wenigstens einen Polymerschicht 20.1, 20.2 auch aus mehreren, in Radialrichtung übereinander gelegten, je in Längsachsenrichtung und in Umfangsrichtung des Pressmantels 20 verlaufenden Ausgangsmaterialien 20''' aufgebaut sein.By means of the invention, a particularly high stability of the
Claims (16)
- Press cover (20) in the form of a continuous belt or hose for a shoe press roll (12), comprising at least one polymer layer, wherein the polymer layer comprises or has been produced from a polyurethane, wherein the polyurethane has been formed from a prepolymer and a crosslinker, and the prepolymer is a reaction product of phenylene 1,4-diisocyanate (PPDI) and at least one polyol, wherein the crosslinker comprises at least two components, namely a first component comprising at least one diamine and a second component, characterized in that the second component is selected from the group of the carbonic esters.
- Press cover (20) according to Claim 1, characterized in that the first component is selected from 4,4'-methylenebis(3-chloro-2,6-diethylaniline) (MCDEA), 4,4'-diaminodicyclohexylmethane or mixtures thereof.
- Press cover (20) according to Claim 1 or 2, characterized in that the crosslinker contains 25% by weight to 95% by weight, preferably 30% by weight to 70% by weight, of the first component.
- Press cover (20) according to any of Claims 1 to 3, characterized in that the second component is or comprises propylene carbonate.
- Press cover (20) according to any of Claims 1 to 4, characterized in that the crosslinker contains 1% by weight to 25% by weight of the second component.
- Press cover (20) according to any of Claims 1 to 5, characterized in that the crosslinker comprises a third component and the third component is selected from at least one polyol, preferably bifunctional polyol, preferably having a molecular weight of 1000 to 4000 g/mol, such as polyester polyol, especially polycaprolactone polyol; polyether polyols, especially polytetramethylene ether glycol (PTMEG), polypropylene glycol (PPG), polyethylene glycol (PEG), polyhexamethylene ether glycol, polycarbonate polyol, polyether carbonate polyol, polybutadiene polyol, perfluoropolyether polyol, silicone polyol or mixtures thereof.
- Press cover (20) according to Claim 6, characterized in that the crosslinker contains not more than 65% by weight of the third component.
- Press cover (20) according to Claim 6 or 7, characterized in that the crosslinker includes a fourth component, comprising a catalyst, and the fourth component is selected from tertiary amines, such as 1,4-diazabicyclo(2.2.2)octane (DABCO), triethylamine, metal compounds, organometallic compounds - for example including or containing bismuth, such as bismuth neodecanoate, mercury, aluminum, zirconium, iron, calcium, sodium, potassium, lead, tin, titanium - or mixtures of the aforementioned substances.
- Press cover (20) according to Claim 8, characterized in that the crosslinker contains not more than 5% by weight of the fourth component.
- Press cover (20) according to any of Claims 1 to 9, characterized in that the at least one polymer layer is the radially outermost polymer layer of the press cover (20) .
- Press cover (20) according to any of Claims 1 to 10, characterized in that a reinforcing structure (20") has been embedded into the at least one polymer layer.
- Press cover (20) according to any of Claims 1 to 11, characterized in that wherein the polyol in the prepolymer comprises a polyether polycarbonate polyol, a polycarbonate polyol, a polytetramethylene ether glycol (PTMEG) or mixtures thereof.
- Shoe press roll (12) for a shoe press (10) for treatment of a fibrous material web (24), characterized in that the shoe press roll (12) includes at least one press cover (20) according to any of the preceding Claims.
- Shoe press (10) for treatment of a fibrous material web (24), preferably a paper, cardboard, tissue or pulp web, comprising a shoe press roll (12) and an opposing roll (14) that together form or bound a nip (22), where the shoe press roll comprises a circumferential press cover, characterized in that the press cover (20) takes the form according to any of Claims 1 to 12.
- Process for producing a press cover (20) in the form of a continuous belt or hose for a shoe press roll (12), preferably according to any of Claims 1 to 12, comprising the following steps:a) providing at least one rotatably mounted winding mandrel (4);b) providing a crosslinker comprising at least two components, namely a first component comprising at least one diamine and a second component from the group of the carbonic esters;c) providing a reaction product of phenylene 1,4-diisocyanate (PPDI) and at least one polyol, for example in the form of a prepolymer;d) mixing the reaction product and the crosslinker to prepare a polyurethane;e) applying the reaction product-crosslinker mixture on a surface of the winding mandrel (4) to form at least one polymer layer (2) of the press cover (20);f) curing the at least one polymer layer (2);g) removing the press cover (1) thus produced from the winding mandrel (4),
preferably with introduction of a reinforcing structure into the reaction product-crosslinker mixture before or after step e). - Use of a press cover (20) according to any of Claims 1 to 12 for a shoe press (10) for treatment of a fibrous material web (24), preferably a paper, cardboard, tissue or pulp web.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017115084.6A DE102017115084A1 (en) | 2017-07-06 | 2017-07-06 | Press cover and method for producing such |
PCT/EP2018/065577 WO2019007650A1 (en) | 2017-07-06 | 2018-06-13 | Press sleeve, use thereof, and process for manufacturing same |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3649287A1 EP3649287A1 (en) | 2020-05-13 |
EP3649287B1 true EP3649287B1 (en) | 2021-01-27 |
Family
ID=62620869
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18731420.8A Active EP3649287B1 (en) | 2017-07-06 | 2018-06-13 | Press sleeve, use thereof, and process for manufacturing the press sleeve |
Country Status (6)
Country | Link |
---|---|
US (1) | US20200291576A1 (en) |
EP (1) | EP3649287B1 (en) |
JP (1) | JP6780151B2 (en) |
CN (1) | CN110869556B (en) |
DE (1) | DE102017115084A1 (en) |
WO (1) | WO2019007650A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4337824A1 (en) * | 2021-05-12 | 2024-03-20 | Voith Patent GmbH | Roller cover and roller |
DE102021119361A1 (en) | 2021-07-27 | 2023-02-02 | Voith Patent Gmbh | Press jacket for a shoe press or conveyor belt with improved properties |
EP4202116A1 (en) | 2021-12-21 | 2023-06-28 | Voith Patent GmbH | Press cover for a shoe press or conveyor belt with improved breaking and friction properties |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5762284A (en) | 1980-10-01 | 1982-04-15 | Sumitomo Chem Co Ltd | Stabilizing method |
JP4516610B2 (en) * | 2008-02-08 | 2010-08-04 | イチカワ株式会社 | Shoe press belt |
DE102011079894A1 (en) * | 2011-07-27 | 2013-01-31 | Voith Patent Gmbh | Press cover for a shoe press or conveyor belt based on cross-linked polyurethane formed from MDI polycarbonate prepolymer |
JP3201639U (en) * | 2012-12-07 | 2015-12-24 | ボイス パテント ゲーエムベーハーVoith Patent GmbH | Press jacket for press rollers |
WO2015086555A1 (en) * | 2013-12-13 | 2015-06-18 | Voith Patent Gmbh | Press band and the use thereof, and press roll and shoe press |
DE102016201344A1 (en) * | 2016-01-29 | 2017-08-03 | Voith Patent Gmbh | Press cover and method for producing such |
-
2017
- 2017-07-06 DE DE102017115084.6A patent/DE102017115084A1/en not_active Ceased
-
2018
- 2018-06-13 CN CN201880045268.3A patent/CN110869556B/en active Active
- 2018-06-13 US US16/628,757 patent/US20200291576A1/en not_active Abandoned
- 2018-06-13 WO PCT/EP2018/065577 patent/WO2019007650A1/en unknown
- 2018-06-13 EP EP18731420.8A patent/EP3649287B1/en active Active
- 2018-06-13 JP JP2020500189A patent/JP6780151B2/en active Active
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
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DE102017115084A1 (en) | 2019-01-10 |
EP3649287A1 (en) | 2020-05-13 |
JP6780151B2 (en) | 2020-11-04 |
WO2019007650A1 (en) | 2019-01-10 |
US20200291576A1 (en) | 2020-09-17 |
CN110869556B (en) | 2022-02-08 |
JP2020525669A (en) | 2020-08-27 |
CN110869556A (en) | 2020-03-06 |
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