WO2005014927A1 - プレスベルトおよびその製造方法、ならびにこれを用いたシュープレスロール - Google Patents
プレスベルトおよびその製造方法、ならびにこれを用いたシュープレスロール Download PDFInfo
- Publication number
- WO2005014927A1 WO2005014927A1 PCT/JP2004/011140 JP2004011140W WO2005014927A1 WO 2005014927 A1 WO2005014927 A1 WO 2005014927A1 JP 2004011140 W JP2004011140 W JP 2004011140W WO 2005014927 A1 WO2005014927 A1 WO 2005014927A1
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- WIPO (PCT)
- Prior art keywords
- press
- press belt
- nco
- belt
- polyurethane
- Prior art date
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/0209—Wet presses with extended press nip
- D21F3/0218—Shoe presses
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/0209—Wet presses with extended press nip
- D21F3/0218—Shoe presses
- D21F3/0227—Belts or sleeves therefor
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/0209—Wet presses with extended press nip
- D21F3/0218—Shoe presses
- D21F3/0227—Belts or sleeves therefor
- D21F3/0236—Belts or sleeves therefor manufacturing methods
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S162/00—Paper making and fiber liberation
- Y10S162/901—Impermeable belts for extended nip press
Definitions
- the present invention relates to a press belt, a method of manufacturing the same, and a press press using the same.
- the present invention relates to a press belt used for press-treating an object to be pressed in various industries such as a paper manufacturing industry, a magnetic recording medium manufacturing industry, and a textile industry, and a method for manufacturing the same.
- the present invention relates to a press roll using the press belt as an outer cylinder.
- a band-shaped press target is placed on a press belt, and a press member located inside the periphery of the press belt and another press member located outside the periphery of the press belt are placed between the press members.
- a belt press for subjecting a press target to a pressure treatment is generally performed.
- the pressing member referred to here is a press roll, a pressing shoe, or the like.
- An example of a belt press is a press as a dewatering press in the paper industry.
- a press roll as an external pressurizing means located outside the periphery of a press belt and a press roll as an internal pressurizing means located inside the periphery of the press belt.
- This is a method in which surface pressure is applied to an object to be pressed (wet paper) placed on the outer peripheral surface of the press belt via a press belt between the pressurizing screen and a pressurizing process (dehydration process).
- a roll press which presses with two rolls, applies a linear pressure to the object to be pressed, while a shure press applies a surface pressure to the object to be pressed by using a pressurized screw with a predetermined width in the running direction. Can be. For this reason, when the dewatering press is performed by the press, there is an advantage that the nip width can be increased and the dewatering efficiency can be increased.
- a pressurizing shoe as an internal pressurizing means is provided by a flexible tubular press belt (press jacket).
- press jacket a pressurizing belt
- Shuffle rolls which are covered and assembled in a roll, are widely used.
- a press may be performed instead of using a roll press or in combination with a roll press .
- Typical requirements for press belts include strength, abrasion resistance, flexibility, and impermeability to water, oil, gas, and the like.
- a polyurethane obtained by reacting urethane prepolymer and a curing agent is generally used for a press belt.
- a press belt, especially a shure press belt is subjected to severe bending and pressurization, so that the occurrence of cracks on the outer peripheral surface is a serious problem in terms of durability.
- Patent Document 2 discloses that the hardness of the resin forming the belt is changed so as to be lower in both edge areas including a part corresponding to a shove edge which is higher in a central area in the width direction. By doing so, a belt for shoe press improved in abrasion resistance and crack resistance has been disclosed. In this case, it is considered that there is an effect that abrasion resistance ⁇ pressure deformation resistance is maintained in the central region, and cracks are less likely to occur in both edge regions.
- the cracks are liable to be concentrated and generated in a region corresponding to both ends in the width direction of the pressing means such as a press roll and a pressing shoe.
- the central area which is located between the corresponding areas on both ends and serves as the pressure-treated surface of the object to be pressed, not so strict crack resistance is required, but rather wear resistance ⁇ ⁇ pressure deformation resistance should be emphasized. Conceivable.
- Patent Document 2 is based on such an idea, but in order to achieve both abrasion resistance and crack resistance due to a change in hardness, the central region and both edges must be separated. It is necessary to increase the change in hardness to some extent. Different polyurethane hardnesses result in different shrinkage forces during molding. For this reason, a belt having a large change in hardness between the center area and both edge areas in the width direction has a low cylindricity, which may impair running performance.
- Patent Document 3 discloses that the composition of the polyurethane constituting the outer peripheral surface of the press belt is determined by the equivalent ratio (H) of the active hydrogen group (H) of the hardener to the isocyanate group (NCO) of the urethane prepolymer.
- H the equivalent ratio of the active hydrogen group (H) of the hardener to the isocyanate group (NCO) of the urethane prepolymer.
- NCO isocyanate group
- Patent Document 1 JP-A-61-179359
- Patent Document 2 JP-A-10-298893
- Patent Document 3 Japanese Patent Application Laid-Open No. 2002-146694
- the present invention solves the above-mentioned problems, and it is difficult for cracks to occur in both end corresponding regions corresponding to both widthwise end portions of a pressing member such as a press roll or a press shoe, and between the end corresponding regions.
- a press belt having excellent abrasion resistance and pressure deformation resistance in the central region, which is a pressurized surface of the object to be pressed, and having good cylindricity and good running properties.
- An object of the present invention is to provide a shot press roll using a belt as an outer cylinder. Means for solving the problem
- the press belt of the present invention has an endless shape and rotates and travels.
- An object to be pressed is placed on the outer peripheral surface side of the press belt, and the press belt is placed inside and / or outside the periphery of the press belt. It is used in a method for press-treating an object to be pressed by a pressurizing means positioned and having a predetermined width.
- the “traveling direction” and the “width direction” refer to the traveling direction and the width direction of the object to be pressed, respectively, unless otherwise specified.
- the object to be pressed is a band-shaped material such as a wet paper web, a magnetic tape, and a fabric, and is not particularly limited.
- the pressurizing means is a press roll, a pressurizing shoe, or the like.
- the press belt is configured to include both end corresponding areas corresponding to both ends in the width direction of the pressing means, and a central area located between the aforementioned both end corresponding areas.
- the press belt is formed mainly of a thermosetting polyurethane (hereinafter, simply referred to as “polyurethane”).
- the polyurethane is a phenylene isocyanate derivative having an isocyanate group (NC ⁇ ) at a terminal. It can be obtained from a thermosetting polyurethane raw material (hereinafter simply referred to as “polyurethane raw material”) containing a body and a curing agent having an active hydrogen group (H) at a terminal.
- the “active hydrogen group” refers to, for example, hydrogen contained in an atomic group such as OH, SH, NH, and COOH, which is liable to undergo a chemical reaction.
- One feature of the present invention is that, in the polyurethane raw material, the value of the equivalent ratio (HZNCO) between the active hydrogen groups (H) and the isocyanate groups (NCO) is relatively high in the region corresponding to both ends of the belt. In that it is adjusted so as to be relatively low in the central region.
- HZNCO equivalent ratio
- Polyurethane obtained from a polyurethane raw material prepared to have a high H / NCO value has excellent crack resistance, but is inferior in wear resistance and pressure deformation resistance, and has a low HZNCO value.
- Polyurethane obtained from a polyurethane raw material prepared as such has excellent abrasion resistance and pressure deformation resistance, but tends to be inferior in crack resistance.
- cracks are suppressed by using polyurethane obtained from a polyurethane material having a relatively high H / NCO value in a region corresponding to both ends where cracks are likely to occur, thereby suppressing the occurrence of cracks and pressing the object to be pressed.
- Abrasion resistance and pressure deformation resistance are maintained by using a polyurethane obtained from a polyurethane material with a relatively low H / NCO value in the central area that is to be the pressure treated surface.
- a polyurethane obtained from a polyurethane material with a relatively low H / NCO value in the central area that is to be the pressure treated surface since it is not necessary to make a large change in hardness between the corresponding region at both ends and the central region, there is no variation in the shrinkage force in the width direction during belt molding, and a belt having good cylindricity can be easily obtained. be able to. Difference in hardness between the central region and the region corresponding to both ends It is preferable to set the hardness of the Type A du-meter to less than 1 degree, because there is less risk of impairing the cylindricity.
- the hardness of the corresponding region at both ends may be lower than that of the central region to provide a hardness difference.
- the value of the equivalent ratio (H / NCO) between the active hydrogen group (H) and the isocyanate group (NC ⁇ ) is 1.01 or more and 1.14 or less in the corresponding region at both ends, and further 1. It is preferable that the value be 08 or more and 1.14 or less, 0.85 or more and less than 1.08 in the central area, and 0.92 or more and less than 1.08. If the value of (H / NCO) in the corresponding region at both ends is 1.01 or more, sufficient crack resistance can be obtained, and if it is 1.14 or less, the minimum required wear resistance in the corresponding region at both ends can be secured. Wear. If the value of (HZNCO) in the central area is 0.85 or more, the minimum The required crack resistance can be secured, and if it is less than 1.08, good wear resistance can be obtained.
- the general size of a press belt is about 2 to 15 m in width, about 1 to 30 m in circumference, and about 2 to 10 mm in thickness.
- the press belt according to the present invention uses a polyurethane material having a low equivalent ratio (H / NCO) and a high equivalent ratio (HZNCO) with respect to the thickness of the central region using the polyurethane material. It is preferable to reduce the thickness of the corresponding region at both ends.
- Polyurethane obtained from a polyurethane material having a high equivalent ratio (H / NCO) has a property of being more easily worn than polyurethane obtained from a polyurethane material having a low equivalent ratio (HZNCO).
- the thickness of the press belt formed using a polyurethane material with a high equivalent ratio (H / NCO) value in the area corresponding to both ends, the pressure applied to the press belt in the area corresponding to both ends is reduced. And wear in the corresponding regions at both ends can be suppressed.
- the thickness of the thinnest portion in the region corresponding to both ends of the press belt is preferably 50 to 98% of the thickness of the thickest portion in the central region. In this case, since the thickness of the press belt in the corresponding region at both ends is maintained at a certain level or more, the strength required for the press belt can be maintained, and there is little danger that the quality of the object to be pressed will deteriorate.
- the press belt is a shure press belt used for a dewatering press of a paper machine
- a large number of water-squeezing recesses that is, grooves
- a blind hole may be formed.
- the value of the equivalent ratio (H / NCO) of the polyurethane raw material is relatively high in the central region, which is relatively high in the region corresponding to both ends of the belt, so that cracks are easily generated at both ends. Cracks can be suppressed in the corresponding area, and good wear resistance and anti-caloric pressure deformation can be ensured in the central area, which is the pressurized surface of the object to be pressed. Good water squeezing can be maintained.
- the deepest concave portion in the region corresponding to both ends is located in the central region.
- the depth is 1.1 to 3.0 times the depth of the shallow recess.
- Both ends formed using a polyurethane material with a high equivalent ratio (H / NCO) compared to the central region formed using polyurethane materials with a low equivalent ratio (HZNCO) value If the depth of the deepest recess in the corresponding area at both ends is 1.1 times or more larger than the depth of the shallow recess in the center, the corresponding area is easily worn.
- the depth of the concave portion can be maintained at a certain level or more, so that a decrease in water squeezing performance can be suppressed.
- the depth of the deepest recess in the corresponding region at both ends is 3.0 times or less the depth of the shallow concave portion in the center, the durability of the recess becomes insufficient even in the corresponding region at both ends. Low risk.
- the press belt of the present invention is characterized in that a phenylene isocyanate derivative having an isocyanate group (NCO) at a terminal and an active hydrogen group (H) at a terminal are provided.
- the thermosetting polyurethane raw material is designed so that the equivalence ratio (HZNCO) between the hydrogen group (H) and the isocyanate group (NC ⁇ ) is relatively high in the central region and relatively low in the central region.
- a third step of curing the thermosetting polyurethane raw material In this case, it is preferable to form at least the outer peripheral surface of the press belt by the second step.
- the present invention further relates to a press roll using the above-mentioned press belt.
- the shoe press roll according to the present invention includes an outer cylinder formed of an endless belt, and a press shoe as a pressurizing unit located inside a periphery of the outer cylinder.
- the outer cylinder of the press roll is formed of a press belt having the features of the press belt according to the present invention.
- the value of the equivalent ratio (H / NCO) between the active hydrogen groups (H) and the isocyanate groups (NC ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ) of the polyurethane raw material corresponds to both ends in the width direction of the pressing means. It is configured to be relatively low in the central area located between the corresponding areas at both ends, which is relatively high in the area corresponding to both ends. In the central region where the surface is hard to cause and the press-treated surface of the object to be pressed is excellent in wear resistance and pressure deformation resistance.
- Press pan according to the invention Noreto is suitable for use as an outer cylinder of a shot roll.
- FIG. 1 is a diagram showing a cross section in a running direction of a shuppress device used in a press process of a paper machine.
- FIG. 2 is a cross-sectional view of a principal part showing a cross-section in the width direction of a pressure dewatering unit P in FIG.
- FIG. 3 is a view showing a cross section in a width direction of a press belt according to one embodiment of the present invention.
- FIG. 4 is a diagram showing a cross section in the width direction of a press belt according to another embodiment of the present invention.
- FIG. 5 is a view showing a cross section in a width direction of a press belt according to still another embodiment of the present invention.
- FIG. 6 is a view showing a cross section in a width direction of a press belt according to still another embodiment of the present invention.
- FIG. 7 is a diagram showing a cross section in the width direction of a shot press roll of the present invention.
- FIG. 8 is a diagram illustrating a method of a crack resistance test.
- FIG. 1 is a diagram showing a cross section in the running direction of a shure press device used in a press process of a paper machine.
- the press machine includes a press roll as a pressurizing unit 1, a press belt 2 facing the press roll, and a pressurizing unit as a pressurizing means 3 located inside the periphery of the press belt 2.
- the pressurizing shoe was covered with a press belt 2, and the press belt 2 was assembled into a roll using an outer cylinder.
- the press roll 2 which constitutes the roll 30 can be used as an endless belt which can be assembled without forming a roll.
- the press roll is located outside the press belt 2 and functions as one pressing means.
- the pressure shoe is located inside the periphery of the press belt 2 and functions as the other pressure means. Between the press belt 2 and the press roll, a wet paper 5 as an object to be pressed is passed over the felt 4. The outer peripheral surface of the press belt 2 and the belt 4 are in direct contact. Lubricating oil is supplied between the press belt 2 and the pressure shoe, and the press belt 2 can slide on the pressure shoe.
- the press roll is driven to rotate, and the press belt 2 is driven to rotate while sliding on the pressure shoe due to frictional force with the running felt 4.
- the pressure shoe is pressed against a press roll on the inner circumferential side of the press belt 2, and the wet paper web 5 is pressed by the pressing force to be dehydrated.
- the surface of the pressure shoe has a concave shape corresponding to the surface of the press roll. For this reason, a pressurized dewatering section P having a wide width in the running direction is formed between the press roll and the press belt 2.
- FIG. 2 is an essential part cross-sectional view showing a cross section in the width direction of the pressurized dewatering unit P in FIG.
- the press roll as the pressurizing means 1 and the press shoe as the pressurizing means 3 have a certain length in the width direction.
- the press belt 2 has a central region A, regions B and B 'corresponding to both ends, and end regions C and C'.
- the both end corresponding areas B and B ' are areas corresponding to a part including both ends 7 and 7' of the pressing surface 6 of the press roll and both ends 9 and 9 'of the pressing surface 8 of the pressing shoe.
- the central area A is an area located between the end corresponding areas B and B ′.
- the extreme end areas C and C ' are areas located on the further end side of the end corresponding areas B and B'.
- the press belt 2 is generally formed by impregnating and covering an endless reinforcing substrate made of a woven fabric, a net, a yarn, or the like with polyurethane.
- the method for obtaining the polyurethane is not limited, but a urethane prepolymer having an isocyanate group (NC ⁇ ) at the terminal and a curing agent having an active hydrogen group (H) at the terminal are provided in that a desired polymer can be easily obtained. Is preferably used.
- the urethane prepolymer is obtained, for example, by reacting a polyol with a phenylene isocyanate derivative.
- the polyol is selected from a polyether polyol and a polyester polyol.
- a polyether polyol for example, examples include polyethylene glycol (PEG), polypropylene glycol (PPG), and polytetramethylene glycol (PTMG).
- the polyester polyol include polypropratatone ester, polycarbonate, polyethylene adipate, polybutylene adipate, and polyhexene adipate. These can be used singly or as a mixture or polymerization of two or more thereof, and modified products thereof, for example, modified silicon products can be used.
- Examples of the phenylene isocyanate derivative for obtaining the urethane prepolymer include tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), and m_xylene diisocyanate (m_XDI). ), Naphthalenediisocyanate (NDI) and the like. These can be used alone or in combination of two or more.
- curing agent one or a mixture of two or more kinds of curing agents such as polyol, aromatic diol, and aromatic diamine that can be generally used as a curing agent for polyurethane is used. be able to.
- polyol-based curing agent those exemplified above as the polyol can be used.
- aromatic diol-based curing agent include hydroquinone di ( ⁇ -hydroxyethyl) ether (HQEE).
- aromatic diamine-based curing agents examples include 4,4'-methylenebis- (2-chloroaniline) (MOCA), trimethylenebis (4-aminobenzoate) (CUA-4), and getyltoluenediamine ( DETDA), dimethylthiotoluenediamine (DMTDA) and the like.
- the polyurethane forming the press belt 2 is obtained by changing the mixing ratio of the polyol, the phenylene isocyanate derivative and the curing agent between the end regions B, B 'and the center region A.
- the polyurethane raw material has an equivalent ratio (H / NCO) value of 0.85 or more and less than 1.08.
- the value of the equivalent ratio (H / NCO) of the polyurethane raw materials used for the outermost regions C and C is not particularly limited.
- FIG. 3 is a diagram showing a cross section in the width direction of the press belt according to one embodiment of the present invention.
- the press belt 2a has a structure in which a polyurethane is impregnated and covered with a base fabric 10 made of a multi-layer woven fabric as a reinforcing base material. The inner peripheral surface side of the base cloth 10 is uniformly covered with the polyurethane layer 11.
- the outer peripheral surface side of the base cloth 10 is polyurethane 12 located in the central area A, polyurethane 13 and 13 'located in the corresponding areas B and B' at both ends, and polyurethanes 14 and 14 'located in the outermost areas C and C. Covered by Of the polyurethanes forming the outer peripheral surface side, the polyurethanes 13 and 13 'in the corresponding regions B and B' at both ends are obtained from a polyurethane raw material having an equivalent ratio (HZNCO) of 1.01 or more and 1.14 or less, The polyurethane 12 in the central region A is obtained from a polyurethane raw material having an equivalent ratio (H / NCO) value of 0.85 or more and less than 1.08.
- HZNCO equivalent ratio
- H / NCO equivalent ratio
- the thickness of the central region A and the regions B and B 'corresponding to both ends are equal.
- the thickness of the outermost regions C and C ' is made thinner than the other regions in order to facilitate mounting of the press belt 2a on the press device.
- FIG. 4 is a diagram showing a cross section in the width direction of a press belt according to another embodiment of the present invention.
- the press belt 2b is a modification of the press belt 2a shown in FIG.
- the difference between the press velvet 2b and the press belt 2a is that the thickness of the corresponding regions B and B 'at both ends is smaller than the thickness of the central region A.
- the outer peripheral surface side of the base cloth 10 is a polyurethane 15 located in the central area A, polyurethanes 16 and 16 'located in the corresponding areas B and B' at both ends, and outermost areas C and C '. Polyurethane 17, 17 'located.
- Polyurethanes 16 and 16 'located in the corresponding areas B and B' at both ends are thinner than the polyurethane 15 located in the central area A, and the areas B and B 'corresponding to both ends of the press belt 2b. Is 50 to 98% of the thickness in the central area A, for example.
- the thickness in the outermost regions C and C ′ is further thinner than the corresponding regions B and B ′ at both ends in order to facilitate the mounting of the press belt 2a to the press device.
- the polyurethanes 16 and 16 'in the corresponding regions B and B' at both ends have an equivalent ratio (H / NCO) value of 1.01 or more and 1.14 or more. It is obtained from the following polyurethane raw materials, and polyurethane 15 in the central region A is obtained from a polyurethane raw material having an equivalent ratio (HZNCO) value of 0.85 or more and less than 1.08.
- FIG. 5 is a diagram showing a cross section in the width direction of a press belt according to still another embodiment of the present invention. is there.
- the press belt 2c is a modification of the press belt 2a shown in FIG.
- the difference between the press belt 2c and the press belt 2a is that a large number of recesses 21, that is, water squeezing grooves are formed on the outer peripheral surface of the press belt 2c.
- the outer peripheral surface side of the base fabric 10 is formed of polyurethane 18 located in the central area A, polyurethanes 19 and 19 'located in the corresponding areas B and B' at both ends, and outermost areas C and C '. It is covered by the located polyurethane 20, 20 '.
- the polyurethanes 19 and 19 'in the corresponding regions B and B' at both ends of the polyurethane forming the outer peripheral surface side have polyurethanes having an equivalent ratio (HZNCO) of 1.01 or more and 1.14 or less.
- the polyurethane 18 obtained from the raw material and having the equivalent ratio (H / N CO) of 0.85 or more and less than 1.08 is also obtained from the polyurethane 18 in the central region A.
- FIG. 6 is a diagram showing a cross section in the width direction of a press belt according to still another embodiment of the present invention.
- the press belt 2d is a further modification of the press belt 2c shown in FIG.
- the difference between the press belt 2d and the press belt 2c is that the depth of the water extraction groove changes depending on the position in the width direction.
- the outer peripheral surface side of the base fabric 10 is a polyurethane 22, which is located in the central area A, polyurethanes 23, 23 ', which are located in both end corresponding areas B, B', and endmost areas C, C '. It is coated with a polyurethane 24, 24 'located.
- the depth of the recesses 26, 26 'in the corresponding regions B, B' at both ends is 1.1 to 3.0 times the depth of the recess 25 in the central region A.
- the polyurethanes 23 and 23 'in the corresponding areas B and B' at both ends have an equivalent ratio (H / NCO) value of 1.01 or more and 1.14 or more. It is obtained from the following polyurethane raw materials, and the polyurethane 22 in the central region A is obtained from a polyurethane raw material having an equivalent ratio (H / NCO) value of 0.85 or more and less than 1.08.
- FIG. 7 is a diagram showing a cross section in the width direction of the shot press roll of the present invention.
- the press press roll 30 is assembled in a roll shape using a press belt as the pressurizing means 3 covered with a press belt 2 and the press belt 2 as an outer cylinder.
- the press shoe is supported by a hydraulic cylinder 32 on a support shaft 31 and can press the press belt 2 upward.
- end disks 33 are rotatably supported via bearings.
- the edge of the press belt 2 is bent radially inward on the outer periphery 36 of the end disk 33.
- Press belt Bending of 2 edges The portion is sandwiched between an outer peripheral portion of the end disk 33 and a ring-shaped fixing plate 35, and is fixed by being bolted or the like. Lubricating oil is supplied between the press belt 2 and the pressure shoe. In this way, the press belt 2 fixed to the end disk 33 can rotate while sliding on the pressing shoe.
- a belt similar to that shown in FIGS. 2 and 6 can be used as the press belt 2. That is, in the polyurethane forming the press belt 2, the active hydrogen group is changed by changing the blending ratio of the polyol, the phenylene isocyanate derivative and the curing agent in the end regions B and B ′ and the center region A.
- the press belt contains a phenylene isocyanate derivative having an isocyanate group (NCO) at a terminal and a curing agent having an active hydrogen group (H) at a terminal, and comprises an active hydrogen group (H) and an isocyanate group.
- the press belt is generally manufactured by impregnating and covering an endless reinforcing substrate made of a woven fabric, a net, a thread, or the like with a polyurethane material.
- a polyurethane raw material containing a phenylene isocyanate derivative and a curing agent may be directly mixed, but a urethane prepolymer having an isocyanate group at a terminal is used, and a urethane polymer is used. It is preferable to use a method of mixing and curing with a curing agent because a desired polyurethane can be easily and reliably obtained.
- the method of distributing the polyurethane raw material in the second step is not limited.
- a polyurethane raw material for the corresponding region at both ends having a relatively high equivalent ratio (H / NCO) and a polyurethane raw material for the central region having a relatively low equivalent ratio (H / NC ⁇ ) are previously used.
- the polyurethane raw material can also be distributed by impregnating the respective polyurethane raw materials prepared in the first step into the corresponding regions at both ends and the central region of the reinforcing base material.
- the third step when the polyurethane raw material distributed in the second step is heat-cured, it is possible to obtain a press belt in which the desired polyurethane is formed in the corresponding regions at both ends and the central region.
- the method for producing a press belt of the present invention may include, in addition to the above steps, any steps necessary for producing a press belt, such as a step of polishing and cutting the surface of the belt.
- press belts were manufactured using polyurethane materials having various equivalent ratios (H / NCO) alone, and their crack resistance, wear resistance, and the like were evaluated. Of those with good results, one was used for the area corresponding to both ends and one was used for the center. Was used to produce a press belt.
- a quadruple-woven woven cloth having a thickness of 2.5 mm was prepared.
- the polyurethane coated on the base fabric was cut and polished so that the thickness from the surface of the base fabric was 1. Omm. After that, the front and back of the base fabric were reversed so that the coated surface was on the inner peripheral surface side. Next, a urethane mixture having the same composition as that of the polyurethane layer on the inner peripheral side was impregnated from the outer peripheral side of the base cloth, and the entire base cloth was completely filled with polyurethane.
- polyurethanes having compositions shown in Table 1 and having different values of H / NCO were used individually, and the entire outer peripheral surface of the base fabric was covered. Then heat the whole at 127 ° C for 16 hours, The polyurethane was completely cured, and the base fabric and the polyurethane were bonded and integrated. Further, the surface of the polyurethane layer constituting the outer peripheral surface was polished so that the thickness from the surface of the base fabric was 1.5 mm. Furthermore, a large number of drain grooves were formed on the outer peripheral surface along the circumferential direction with a groove width of 0.9 mm, a depth of 0.9 mm, and a pitch of 2.54 mm. By the method described above, a press belt (samples 11-11) was obtained in which the polyurethane constituting the outer peripheral surface had a type A durometer hardness of 95 at the position of the displacement.
- FIG. 8 is a diagram illustrating a method of a crack resistance test.
- a test piece 40 having a width of 20 mm and a length of 420 mm was cut out from each sample.
- a metal shaft 42 having a smooth surface with a diameter of 25 mm was applied to the inside of the intermediate portion, and the test piece 40 was 9.8 kN / m2.
- Tension T was applied. While maintaining the tension, the gripping member 41 was moved while the lubricating oil 43 was being supplied from the nosepiece 43 between the inner surface of the test piece 40 and the shaft 42, so that the test piece 40 was repeatedly reciprocated with a width of 10 cm. . In this manner, sliding was repeated between the inner surface and the shaft 42 while applying tension to the test piece 40. 2 After the reciprocation of one million times, the occurrence of cracks on the surface of Sampnolet was visually observed. Table 1 shows the results.
- the residual ratio of the groove under pressure was compared by the following method. First, injection-type silicone rubber was poured into the grooves of each sample press belt, and the silicone rubber was cured while applying a load of 6.9 MPa in the thickness direction of the press belt using a compression tester. Next, the grooved force of the cured silicone rubber was sampled, and the groove was press-molded. Then, the volume of the groove at the time of pressurization was measured from the volume of the cured silicone rubber. The groove volume at the time of pressurization with respect to the groove volume at the time of no pressurization was expressed as a percentage, and was defined as the groove residual ratio under pressure. The results are shown in Table 1.
- the operating conditions were a running speed of 1200 m / min and a nip pressure of 1000 kN / m.
- the volume of the groove in a non-pressurized state was measured.
- the degree of decrease in the groove volume with the number of days of use was used as an evaluation standard for wear resistance.
- the groove volume on each day was expressed as a percentage, assuming that the groove volume without pressure before running was 100%. Table 2 shows the results.
- a press belt 2c shown in FIG. 5 was manufactured as follows using the polyurethane raw material of Sample 3 in the region corresponding to both ends and the polyurethane raw material of Sample 8 in the central region.
- a quadruple-woven fabric having a thickness of 2.5 mm was prepared.
- This urethane mixed solution was coated on the surface of the base fabric 10 with the front and back turned upside down, and cured by heating at 80 ° C. for 10 hours.
- the urethane mixed solution was impregnated to about 50% of the thickness of the base fabric 10.
- the polyurethane layer 11 coated on the base fabric 10 was polished so that the thickness from the surface of the base fabric 10 became 1.0 mm.
- the front and back of the base fabric 10 were inverted so that the coated surface was on the inner peripheral surface side.
- a urethane mixture having the same composition as that of the polyurethane layer 11 on the inner peripheral surface side was impregnated from the outer peripheral surface side of the base fabric 10, and the entire base fabric 10 was completely filled with polyurethane.
- the whole was heated at 127 ° C for 16 hours to completely cure the polyurethane, and the base fabric and the polyurethane were bonded and integrated.
- the outermost areas C and C ′ are arranged such that the central area A and the areas B and B ′ corresponding to both ends have a thickness of 1.5 mm from the surface of the base fabric 10.
- the surface of the belt was cut and polished so that the thickness from the surface of the base fabric 10 was 0.5 mm.
- a number of concave portions 21 were formed along the circumferential direction with a groove width of 0.9 mm, a depth of 0.9 mm, and a pitch of 2.54 mm.
- the overall thickness is 5.0 mm
- the hardness of the back surface is 90 in type A durometer hardness
- the hardness of the front surface is center region A, both end corresponding regions B, B ', and extreme end.
- a belt having a type A durometer hardness of 95 was obtained.
- the polyurethane raw material of sample 3 was used in the region corresponding to both ends, and the polyurethane raw material of sample 8 was used in the central region. Therefore, the results of the above (2) to (4) were referred to. Then, when used in a press machine of a paper machine, good crack resistance is ensured in the areas B and B 'corresponding to both ends, while good abrasion resistance and It is considered that resistance to pressure deformation can be ensured.
- the press belt according to the present invention has abrasion resistance and abrasion resistance in the central region where cracks are less likely to occur and the pressurized surface of the object to be pressed, even in the regions where both ends are likely to crack. It is excellent in pressure deformability. In addition, since there is no need to make a large change in hardness between the area corresponding to both ends and the center area, the contraction force during belt molding varies in the width direction. Is unlikely to occur. Therefore, a belt with good cylindricity can be obtained, and the running property when used as a press roll is improved.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Paper (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2004800223061A CN1833070B (zh) | 2003-08-07 | 2004-08-04 | 压力带及其制造方法以及使用该压力带的闸瓦压力辊 |
AU2004262707A AU2004262707B2 (en) | 2003-08-07 | 2004-08-04 | Press belt, process for producing the same and shoe press roll using the press belt |
JP2005512934A JP3926375B2 (ja) | 2003-08-07 | 2004-08-04 | プレスベルトおよびその製造方法、ならびにこれを用いたシュープレスロール |
CA002534813A CA2534813C (en) | 2003-08-07 | 2004-08-04 | Press belt and method of manufacturing the same as well as shoe press roll employing the same |
US10/567,366 US7611608B2 (en) | 2003-08-07 | 2004-08-04 | Press belt, process for producing the same and shoe press roll using the press belt |
EP04771181A EP1653001B1 (en) | 2003-08-07 | 2004-08-04 | Press with press belt and method for producing a press belt |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-288658 | 2003-08-07 | ||
JP2003288658 | 2003-08-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005014927A1 true WO2005014927A1 (ja) | 2005-02-17 |
Family
ID=34131518
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/011140 WO2005014927A1 (ja) | 2003-08-07 | 2004-08-04 | プレスベルトおよびその製造方法、ならびにこれを用いたシュープレスロール |
Country Status (8)
Country | Link |
---|---|
US (1) | US7611608B2 (ja) |
EP (1) | EP1653001B1 (ja) |
JP (1) | JP3926375B2 (ja) |
KR (1) | KR100692161B1 (ja) |
CN (1) | CN1833070B (ja) |
AU (1) | AU2004262707B2 (ja) |
CA (1) | CA2534813C (ja) |
WO (1) | WO2005014927A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1854918A1 (en) * | 2005-03-04 | 2007-11-14 | Yamauchi Corporation | Press belt and shoe press roll |
JP2009508784A (ja) * | 2005-09-23 | 2009-03-05 | フォイト パテント ゲゼルシャフト ミット ベシュレンクテル ハフツング | 搬送ベルト |
WO2014200095A1 (ja) * | 2013-06-14 | 2014-12-18 | イチカワ株式会社 | 製紙用シュープレスベルト |
JP7429745B2 (ja) | 2021-09-30 | 2024-02-08 | バルメット テクノロジーズ オサケユキチュア | ベルト |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1940179B (zh) * | 2005-09-27 | 2010-05-26 | 市川株式会社 | 砧台加压带 |
JP5731773B2 (ja) * | 2010-09-02 | 2015-06-10 | ヤマウチ株式会社 | プレスベルト及びシュープレスロール並びにプレスベルトの製造方法 |
WO2015042222A1 (en) * | 2013-09-20 | 2015-03-26 | Stowe Woodward Licensco, Llc | Soft rubber roll cover with wide grooves |
Citations (4)
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JPH10298893A (ja) * | 1997-04-24 | 1998-11-10 | Ichikawa Woolen Textile Co Ltd | シュープレス用ベルト |
US5943951A (en) * | 1996-12-17 | 1999-08-31 | Voith Sulzer Papiermaschinen Gmbh | Press roll for treating a material shaped in the form of a web |
JP2000110090A (ja) * | 1998-08-06 | 2000-04-18 | Ichikawa Woolen Textile Co Ltd | 抄紙用ベルト |
JP2002146694A (ja) * | 2000-11-10 | 2002-05-22 | Yamauchi Corp | 製紙用ベルトおよび製紙用ベルトの製造方法 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
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DE3501635A1 (de) | 1985-01-19 | 1986-07-24 | J.M. Voith Gmbh, 7920 Heidenheim | Presswalze |
JP3507432B2 (ja) * | 2000-12-13 | 2004-03-15 | ヤマウチ株式会社 | 製紙用弾性ベルト |
CN1182295C (zh) * | 2001-06-28 | 2004-12-29 | 市川毛织株式会社 | 压光带 |
JP2003049380A (ja) * | 2001-07-31 | 2003-02-21 | Ichikawa Woolen Textile Co Ltd | シュープレス用ベルト |
-
2004
- 2004-08-04 US US10/567,366 patent/US7611608B2/en not_active Expired - Fee Related
- 2004-08-04 AU AU2004262707A patent/AU2004262707B2/en not_active Ceased
- 2004-08-04 CN CN2004800223061A patent/CN1833070B/zh not_active Expired - Fee Related
- 2004-08-04 WO PCT/JP2004/011140 patent/WO2005014927A1/ja active IP Right Grant
- 2004-08-04 CA CA002534813A patent/CA2534813C/en not_active Expired - Fee Related
- 2004-08-04 JP JP2005512934A patent/JP3926375B2/ja not_active Expired - Fee Related
- 2004-08-04 KR KR1020067002483A patent/KR100692161B1/ko not_active IP Right Cessation
- 2004-08-04 EP EP04771181A patent/EP1653001B1/en not_active Not-in-force
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5943951A (en) * | 1996-12-17 | 1999-08-31 | Voith Sulzer Papiermaschinen Gmbh | Press roll for treating a material shaped in the form of a web |
JPH10298893A (ja) * | 1997-04-24 | 1998-11-10 | Ichikawa Woolen Textile Co Ltd | シュープレス用ベルト |
JP2000110090A (ja) * | 1998-08-06 | 2000-04-18 | Ichikawa Woolen Textile Co Ltd | 抄紙用ベルト |
JP2002146694A (ja) * | 2000-11-10 | 2002-05-22 | Yamauchi Corp | 製紙用ベルトおよび製紙用ベルトの製造方法 |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1854918A1 (en) * | 2005-03-04 | 2007-11-14 | Yamauchi Corporation | Press belt and shoe press roll |
EP1854918A4 (en) * | 2005-03-04 | 2008-10-08 | Yamauchi Corp | PRESSBAND AND SHOE PRESS |
JP2009508784A (ja) * | 2005-09-23 | 2009-03-05 | フォイト パテント ゲゼルシャフト ミット ベシュレンクテル ハフツング | 搬送ベルト |
WO2014200095A1 (ja) * | 2013-06-14 | 2014-12-18 | イチカワ株式会社 | 製紙用シュープレスベルト |
CN105339546A (zh) * | 2013-06-14 | 2016-02-17 | 株式会社市川 | 造纸用靴形压榨带 |
JPWO2014200095A1 (ja) * | 2013-06-14 | 2017-02-23 | イチカワ株式会社 | 製紙用シュープレスベルト |
US9732470B2 (en) | 2013-06-14 | 2017-08-15 | Ichikawa Co., Ltd. | Shoe press belt for papermaking |
JP7429745B2 (ja) | 2021-09-30 | 2024-02-08 | バルメット テクノロジーズ オサケユキチュア | ベルト |
Also Published As
Publication number | Publication date |
---|---|
JP3926375B2 (ja) | 2007-06-06 |
AU2004262707A1 (en) | 2005-02-17 |
CN1833070B (zh) | 2010-12-29 |
JPWO2005014927A1 (ja) | 2007-09-27 |
AU2004262707B2 (en) | 2010-11-18 |
KR20060031878A (ko) | 2006-04-13 |
CA2534813C (en) | 2009-10-13 |
CN1833070A (zh) | 2006-09-13 |
KR100692161B1 (ko) | 2007-03-12 |
US20060201649A1 (en) | 2006-09-14 |
EP1653001A4 (en) | 2007-10-03 |
EP1653001A1 (en) | 2006-05-03 |
CA2534813A1 (en) | 2005-02-17 |
US7611608B2 (en) | 2009-11-03 |
EP1653001B1 (en) | 2012-12-05 |
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