EP1088933A2 - Semipermeable Membran mit miteinander in Verbindung stehenden Poren für eine Presse - Google Patents
Semipermeable Membran mit miteinander in Verbindung stehenden Poren für eine Presse Download PDFInfo
- Publication number
- EP1088933A2 EP1088933A2 EP00120661A EP00120661A EP1088933A2 EP 1088933 A2 EP1088933 A2 EP 1088933A2 EP 00120661 A EP00120661 A EP 00120661A EP 00120661 A EP00120661 A EP 00120661A EP 1088933 A2 EP1088933 A2 EP 1088933A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- membrane
- web
- fluid
- displacement
- fibrous web
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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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
- D21F3/0254—Cluster presses, i.e. presses comprising a press chamber defined by at least three rollers
-
- 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
- D21F3/0254—Cluster presses, i.e. presses comprising a press chamber defined by at least three rollers
- D21F3/0263—Sealing arrangements 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
- D21F3/0272—Wet presses in combination with suction or blowing devices
-
- 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
- D21F3/029—Wet presses using special water-receiving belts
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/04—Arrangements thereof
- D21F3/045—Arrangements thereof including at least one extended press nip
Definitions
- the invention relates to a pressing device such as a pressing device with a plurality of chambers forming one Rollers, and in particular a unitary membrane for use in particular in such a pressing device, and a method for the production of a corresponding membrane.
- Multi-roll structure is provided which is a closed chamber forms, allowing air to circulate through the chamber, to transport moisture out of the paper web.
- the solution according to the invention relating to the first aspect brings one improved drainage of a continuous web, such as Paper, with itself and enables effective sealing of a chamber on the nips in a press device.
- the invention thus creates a uniform membrane for use in a press device.
- the press device includes two longitudinally extending edge sections and one semi-permeable section with a variety of interconnected standing pores.
- the semipermeable section is between the A pair of longitudinally extending edge portions arranged.
- the unitary membrane comprises a shaped fabric and has a thickness less than about 2.54 mm (0.1 inches).
- the semipermeable section has a permeability greater than zero and less than approximately 0.025 m / s (five CFM per square foot) as by the TAPPI test procedure TIP 0404-20 measured (see in particular claim 1).
- the pair is more longitudinally extending Edge sections so tapered that a cross section of the uniform Membrane has a trapezoidal shape.
- the two are in the longitudinal direction extending edge sections preferably impermeable.
- the invention according to the first aspect also provides a method for Prepare the unitary membrane and include the steps that a Backing fabric is provided that is very permeable and that many interconnected pores are formed in the carrier fabric be (see in particular claim 10).
- a method for drainage a fibrous web in particular a paper or cardboard web, provided, in which the fibrous web through a dewatering zone is carried out in which it is at least partially due to an application with pressurized displacement fluid, in particular Displacement gas is dewatered, the fibrous web together with a porous membrane through the drainage zone and through the membrane with the displacement fluid will (see claim 20).
- a membrane made of film material with through holes can be used as the membrane existing membrane can be used.
- the pressure of the displacement fluid acting on the membrane is in particular greater than the ambient pressure.
- a membrane can be used as it is related with the first aspect of the invention.
- the membrane can in particular be provided with coherent pores his.
- the invention relates to a method for drainage a fibrous web, in particular a paper or cardboard web, in which the fibrous web is led through a dewatering zone in which it is at least partially affected by exposure to Pressurized displacement fluid, in particular displacement gas, is drained (cf. the preamble of claim 25).
- a device according to the preamble of claim 34.
- the extent of this compression depends on the ratio of permeability the membrane and the nonwoven. With targeted compression can determine the dry content and specific volume of the finished fibrous web can be set.
- the compression of the nonwoven can in the displacement drainage system in practice, however, only with difficulty control, because the membrane permeability in the operation of the production plant difficult to change. This results in the same for the rest Process conditions at a certain fluid or gas pressure a certain Dry content and a certain specific volume.
- the aim of the invention is a method and to create a device of the aforementioned type with which the result of the displacement drainage process in relation to the achieved Dryness and paper technology properties of the finished Fibrous web such as, in particular, specific volume, porosity, surface roughness and / or the like can be controlled in a targeted manner.
- this task is performed according to the third aspect solved the invention in that the drainage zone in several Sections are divided in which the applied fluid or gas pressure is individually adjustable (see claim 25).
- the fibrous web preferably together with a membrane through the drainage zone passed and through this membrane with the displacement fluid or gas applied.
- the drainage zone in several one behind the other in the direction of web travel Sections divided in which the applied fluid or gas pressure individually is adjustable.
- a high final dry matter content is required, then advantageously viewed in at least one further in the direction of web travel rear section of the drainage zone a higher fluid or Gas pressure applied as viewed in a front direction of web travel Section.
- the finished fibrous web can achieve a relatively high volume viewed in at least one further in the direction of web travel a corresponding section of the drainage zone at the rear low fluid or gas pressure are applied.
- a membrane can be used as it is related with the first aspect of the invention and is particularly indicated in claims 1 to 19.
- the invention relates to a method for drainage a fibrous web, in particular a paper or cardboard web, in which the fibrous web passes through a displacement drainage zone is carried out in which it is at least partially due to an application with displacement fluid, in particular displacement gas, dewatered (see the preamble of claim 43).
- a device according to the preamble of Claim 49 according to the preamble of Claim 49.
- This fourth aspect of the invention is at least essentially concerned again with that previously related to the third aspect the problem explained the invention.
- this task is performed according to the fourth aspect solved the invention in that the fibrous web moreover by a press upstream of the displacement drainage zone (see claim 43).
- the extent of leaf compression and the level of the applied fluid or gas pressure can be controlled separately.
- the nonwoven Through the press upstream of the displacement drainage zone the nonwoven can be pre-compacted to the desired size.
- the permeability of the nonwoven fabric in the desired way.
- a shoe press or a roller press can be used as an upstream press be used.
- the fibrous web can in particular together with a porous Membrane passed through the displacement drainage zone and through the membrane with the displacement fluid or gas become.
- a membrane can be used as it is related with the first aspect of the invention and is particularly indicated in claims 1 to 19.
- the Task solved accordingly in that the displacement drainage zone a mechanical press in particular is connected upstream and that the fibrous web first through the upstream press and then is led through the displacement drainage zone (cf. claim 49).
- a downstream mechanical press can also be provided his.
- a shoe press can in particular be used as an upstream press or a roller press can be provided.
- the fibrous web can in particular also together with a porous membrane passed through the displacement drainage zone and through the membrane with the displacement fluid or gas be acted upon.
- FIG. 1 there is a press arrangement 10 shown, which is particularly useful in papermaking.
- the Press assembly 10 includes a frame 12, a load cylinder 14, a press roll assembly 16, a tensioning structure 18, a membrane 20 and a control unit 21.
- the frame 12 comprises a main frame 22, an upper swing frame 24, a lower swing frame 26, an upper swing arm 28, a lower swing arm 30 and a pair of side frames 32, 33.
- the Side frame 32 is shown with a portion broken away to an inner Expose part of the side frame 33.
- the swivel arms 24, 26 are, for example by welding or screws, firmly on the Main frame 22 attached.
- the swivel arms 28, 30 are each over multiple pivots 34 pivotally attached to the in a conventional manner Swing frame 24, 26 mounted.
- Each swivel arm 28, 30 has a first one End 36, 38, which is designed such that it is opposite Ends 40, 42 of the loading cylinder 14 via pin 44.
- Each swivel arm 28, 30 has a second end 46, 48 which is designed in this way, for example by welding or screwing, that it holds the respective bearing housing 50, 52 firmly.
- the first and second side frames 32, 33 are on opposite sides of the Main frame 22 mounted.
- the press roll assembly 16 includes a plurality of rolls 60, 62, 64, 66 (four Rollers, as shown), for cooperative rotation in the frame 12 are arranged.
- By interacting rotation is meant that the rotational speed on the peripheral surface of each of the rollers 60, 62, 64, 66 together is essentially the same, being essentially there is no slippage between the roller surfaces.
- the expediency sometimes the rollers 60, 62 are the main rollers and rollers 64, 66 are referred to as pressure rollers.
- all the rollers 60, 62, 64, 66 are generally closed Hollow cylinders each having a first circular end 68, 70, 72, 74, a second circular end 76, 78, 80, 82 and a cylindrical, middle circumferential surface 84, 86, 88, 90, and they are all each radially symmetrical about an axis of rotation 92, 94, 96, 98.
- One set Seals 99 may be formed at the first circular ends 68, 70, 72, 74 and the second circular ends 76, 78, 80, 82.
- the Main rollers 60, 62 and pressure rollers 64, 66 are arranged axially in parallel.
- each pressure roller 64, 66 is smaller than the circumference of each Main roller 60, 62.
- rollers 60, 62, 64, 66 are arranged in such a way that they have a corresponding number of nips 100, 102, Define 104, 106.
- the pressure rollers 64, 66 are used to run along a seal the axial extent of the main rollers 60, 62 at the nips 100, 102, 104, 106 to create.
- Each roller 60, 62, 64, 66 can be elastic Coating, such as rubber, include to seal to support at the nips.
- the seal on the Roll gaps 100, 102, 104, 106 require a relatively uniform one Pressure along all nips 100, 102, 104, 106. With the most probable Bending of the main rollers 60, 62 due to the application of force on this by the pressure rollers 64, 66 is some mechanism necessary to create a uniform gap pressure on the Support nips 100, 102, 104, 106.
- pressure rollers 64, 66 hydraulic pressure and a series of pistons within the roll shell of rolls 64, 66 to use the roller shell of the rollers 64, 66 in the roller shell of the main rollers 60, 62 to press to even pressure on the associated Provide columns.
- a crowned or a deflection compensation pressure roller could be used be used.
- the first and second side frames 32, 33 each include a first and a second sealing plate 108, 110, respectively, which are connected to a Are mounted on the inside of these.
- the first and the second sealing plate 108, 110 are forced by the side frames 32, 33 to with part of the first circular ends 68, 70, 72, 74 or a part of the second circular ends 76, 78, 80, 82 of the rollers 60, 62, 64, 66 of the press roll assembly 16 to engage one To define chamber 112 and thus an end seal of the chamber 112 to effect.
- first and second sealing plates 108, 110 are flexible and such constructed and trained that they are essentially in each case to the Shape of the first circular ends 68, 70, 72, 74 and second circular Adjust ends 76, 78, 80, 82 of rollers 60, 62, 64, 66.
- seals Between to further assist the sealing of chamber 112 are seals between the first and second sealing plates 108, 110 and the first and second circular ends 68, 70, 72, 74 and 76, 78, 80, 82 arranged.
- Such seals can be mechanical seals and include fluid seals.
- the main rollers 60, 62 are used on the side frames 32, 33 conventional bearing mounting structures, such as those, the rolling bearings or sockets included, permanently rotatably mounted.
- conventional bearing mounting structures such as those, the rolling bearings or sockets included, permanently rotatably mounted.
- rotatably mounted that the position of the axes 92, 94 of the rollers 60, 62 with respect to the main frame 22 and the side frames 32, 33 not moved after installation, but a rotation is allowed around axes 92, 94.
- the main roller 60 includes the membrane 20 in Fluid communication with chamber 112 is at least one void in Shape of a groove, a hole and a pore in its central peripheral surface is formed to a pressure difference across the membrane 20th and any intermediate material such as the continuous web 140 to ease away.
- the main roller 62 is not in fluid communication with chamber 112 over membrane 20 preferably comprises no such void in its central peripheral area.
- Each The roller can have an elastic coating, such as rubber, over it cover all or part of their roll surface to the Sealing of the chamber 112 at the nips 100, 102, 104, 106 support.
- the pressure rollers 64, 66 are each rotatable on bearing housings 50, 52 assembled. However, the axes of rotation 96, 98 of the rollers 64, 66 are related movable on the main frame 22 via swivel arms 28, 30, respectively to cause a load on the press roll assembly 16. Because the scope and the corresponding diameter of each pressure roller 64, 66 preferably smaller than the circumference and the corresponding diameter of each Main roller 60, 62 are those generated on the pressure rollers 64, 66 Forces are reduced, causing smaller structures to generate forces within the Can hold chamber 112.
- the pressure rollers 64, 66 which are relatively smaller, require a lower actuation force than a relatively larger counter-pressure roller would do. If the diameter of the pressure rollers 64, 66 a One third of the diameter of the main rollers 60, 62 can be on the pressure rollers 64, 66 applied forces in comparison with the forces to the main rollers 60, 62 by 40 percent.
- This arrangement allows the support structure, e.g. the frame 12, for the press roll assembly 16 easier becomes.
- the main rollers 60, 62 are on bearings mounted, which are fixedly attached to the side frame 32, 33, the are in turn firmly attached to the main frame 22.
- the Main rollers 60 and 62 are structurally interconnected and their relative Positions are fixed, the main forces within the press assembly 10 within a relatively simple mechanical structure held.
- the clamping structure 18 is mounted on the main frame 22.
- the clamping structure 18 comprises a tensioning cylinder 114 and a tensioning roller 116
- Tensioning roller 116 is rotatably coupled to tensioning cylinder 114, which is the Tension roller 116 in a direction transverse to the axis of rotation of the tension roller 116 moves.
- the membrane moves 20 in the direction of arrow 118 and is over part of the peripheral surface 88 of the pressure roller 64 passes, runs into an inlet nip 100th runs in over part of the peripheral surface 84 of the main roller 60 inside the chamber 112, runs out of the outlet nip 102 out, runs over part of the peripheral surface 90 of the pressure roller 66 away and runs about half the circumferential surface of the tension roller 116 around.
- the membrane 20 is preferably a continuous one Tape made of a semi-permeable material that is is structured and designed to have a predetermined permeability having a predetermined fluid flow therethrough.
- the semipermeable membrane 20 is likewise preferred up to one limited degree of both gas permeable and liquid permeable.
- the membrane 20 is structured and designed such that they seal the chamber 112 at the inlet gap 100 and at the outlet gap 102 supports.
- the combined effect of the inlet gap 100 serves the purpose of Membrane 20, which runs circumferentially around the main roller 60, and outlet gap 102, a single extended gap 115 for applying a mechanical pressure force in the direction of the main roller 60 and any intermediate material between the membrane 20 and the main roller 60 is arranged to form. Consequently stands the membrane 20 with the pressurized chamber 112 and the main roller 60 connected to simultaneously a predetermined one Fluid flow through the intermediate material as well to cause a mechanical pressure force on this.
- membrane 20 is approximate 2.54 mm (0.1 inch) or less thick and includes a molded fabric that Semipermeable is made by connecting several together standing pores 117 (shown by dots in Fig. 6) in the molding fabric are formed that have a size, shape, frequency and / or pattern have, which is chosen so that the desired permeability provided becomes.
- the permeability is chosen so that it is greater than zero and is less than about 0.025 m / s (five CFM per square foot) as through measured the TAPPI test method TIP 0404-20, and is particularly preferred chosen to be greater than zero and less than approximately Is 0.010 m / s (two CFM per square foot). Therefore, the semipermeable Membrane 20 to a limited degree both gas permeable and liquid permeable.
- the membrane 20 is made semi-permeable by a carrier fabric is assumed to be very permeable, and then several interconnected pores 117 are formed in the carrier fabric become.
- a padding is applied to the base fabric, which from a mixture of heat meltable and not heat fusible fibers is made. The padding from the fiber mixture is sewn into the base fabric. On the sewn carrier fabric heat is applied to the heat-fusible fibers melt, which in turn empty spaces in the form of interconnected standing pores similar to those of a foam sponge, leave behind.
- the membrane 20 preferably comprises two tapered, impervious, longitudinally extending outer edges 20A, 20B, which are adjacent the semipermeable section of the membrane 20 with the one another in Connected pores 117 are formed.
- the outer edges 20A, 20B can be made impermeable by using heat fusible fibers on the outer edges of the membrane 20 in the absence are melted by fibers which cannot be melted by heat.
- the fiber mixture can be sewn into the carrier fabric in order to Flow resistance layer near the surface of the membrane 20 which will be located closest to chamber 112.
- the membrane 20 in operation, when it is exposed to chamber pressure, the pressure drop across the membrane 20 close to the chamber-side surface of membrane 20 occur, causing the membrane 20 entrains a minimal amount of chamber air. Since the membrane is entrained, will release pressurized fluid when out of the Chamber runs out, it is desirable, the entrained fluid volume set up as small as possible to waste from under pressure to avoid chamber fluid. Therefore, it is preferred to use the flow resistance layer close to the surface of the chamber Membrane and it is preferable to make the tissue as thin as possible preferably less than 2.54 mm (0.1 inches). In addition it is preferred to keep the percentage of membrane void as low as possible, preferably less than 40 percent.
- the chamber side The surface is preferably also abrasion-resistant.
- the rest of the Fabric that does not include the fiber blend can serve as a fluid distribution layer act, which receives a fluid flow from the resistance layer and the fluid flow over the underlying continuous Lane 140 distributed.
- the interconnected pores 117 of the Membrane 20 formed by coating layers on the base fabric be applied until the desired permeability is reached.
- the Permeability is set by changing any parameter from: the type of coating, the entrainment of air into the carrier, to form a foam, and adjusting the solids content of the Coating. The coating process is stopped when the desired one Flow resistance level of the membrane 20 is reached.
- the control unit 21 comprises a controller 120, a compressed air source 122, a fluid source 124, a differential pressure source 125 and a sensor assembly 126.
- Controller 120 preferably includes a microprocessor and one Memory for storing and executing a control program, and includes an I / O device for establishing input / output communication and data transfer with external devices.
- controller 120 may be an industrial programmable Controllers of a type that is well known in the art.
- the compressed air source 122 comprises several individually controllable outputs.
- the Compressed air source 122 is connected to the loading cylinder 14 via a line 128 fluid coupled.
- the compressed air source 122 is also with the tension cylinder 114 fluidly coupled via line 130. While the preferred working fluid, to operate cylinders 14, 114 is compressed air, Experts will find that the compressed air system is against another Fluid source could be exchanged with another gas or one liquid working fluid used.
- Fluid source 124 is fluidly coupled to chamber 112 via line 132.
- the type of fluid is determined by the user depending on the type of Material that the press assembly 10 processes selectable. For example compressed air may be desirable in some applications to use the chamber 112 at a predefined pressure to pressurize the preferred embodiments of the invention is a pressure that is greater than 30 psi above the pressure of the differential pressure the differential pressure source 125. For other applications it may be desirable to use a pressurized gas such as a heated one Gas, or a liquid, such as water, or a liquid solution too use.
- the white spaces in the main roller 60 are connected to the differential pressure source 125 Line 133 in connection.
- the differential pressure source 125 can, for example a negative pressure source, a pressure source that works at a pressure, which is lower than the pressure in chamber 112, or simply one Vent to the atmosphere, which is via line 133 to the inside roller 60 is coupled to effect evacuation of the voids.
- Venting can be similar via line 133 if the roller empty spaces, such as blind holes, are large enough, and if they enter the nip with pressure, which is lower than the chamber pressure.
- the White spaces act as a differential pressure source until the empty spaces Reach chamber pressure.
- the empty space size can be chosen that the effectiveness of the drainage process is controlled.
- the pressurized chamber 112 includes its own pressure relief, by causing excessive pressure build-up in chamber 112 is that one or more rollers 60, 62, 64, 66 open to relieve the pressure instead of catastrophic failure.
- Controller 120 is electrically connected to compressed air source 122 Electrical cables 134 connected to selectively select the fluid outlet therefrom control and thus the operation of the loading cylinder 14 independently control and create a load on the press roll assembly 16, and the Control the operation of the clamping cylinder 114 independently and thus a to create predetermined tension on the semipermeable membrane 20.
- Controller 120 is electrical with fluid source 124 via an electrical cable 136 connected. Controller 120 is also electrical with the Sensor assembly 126 connected via an electrical cable 138.
- the sensor structure 126 includes one or more sensor mechanisms to detect electrical To provide feedback signals to controller 120, one or the other Combination of a pressure, a temperature or a represent another environmental factor within chamber 112.
- the Controller 120 processes the feedback signals to output signals generate, which are supplied to the fluid source 124 to selectively the Control fluid output from this.
- controller 120 processes from sensor assembly 126 received feedback signals to a pressure of the pressurized Chamber 112 preferably to control a pressure that is greater than 30 psi above the pressure of differential pressure source 125.
- the rollers 60, 62, 64, 66 are rotated with little or no slip between them, and the membrane 20 is at the same speed as that Surface speed of the rollers 60, 62, 64, 66 driven.
- a continuous web or paper web 140 and a web support layer 142 are in the inlet nip 100 in the direction of arrow 143 initiated and from the membrane 20 through the extended gap 115 passed through to the outlet nip 102.
- the membrane 20 is inside of the roller assembly 16 arranged so that they next to a first Page 144 of the continuous path 140 lies around their direct connection to effectively separate with the pressurized chamber 112. In other words, the fluid in chamber 112 may not be on the continuous web 140 act except through membrane 20.
- the web support layer 142 is arranged such that it coincides with the cylindrical Middle surface 84 of the main roller 60 is in contact, and that it with a second side 146 of the continuous web 140 is in contact.
- the membrane 20 is structured and designed such that it has a permeability having a predetermined fluid flow therethrough through to the continuous path 140, and stands with the pressurized chamber 112 and at least one void of the Main roller 60 connects to a pressure difference across the membrane 20 and to produce the continuous path 140.
- This pressure drop leads to a mechanical pressure force on the continuous Web 140 is applied, which helps to solidify them. Therefore stands the membrane 20 with the pressurized chamber 112 and the Main roller 60 in combination to simultaneously combine a predetermined one Fluid flow through the continuous path 140 as well to cause a mechanical pressure force on this and thus a to promote improved drainage of the continuous web 140.
- the invention is particularly advantageous when the dry content of the continuous web 140 before dewatering is greater than about 6 percent and less than about 70 percent, and when the basis weight of the continuous web 140 is greater than about 25 g / m 2 .
- the web support layer 142 preferably has a thickness of approximately 2.54 mm (0.1 inch) or less and can be a felt or alternatively comprise a felt which is arranged next to a hydrophobic layer, the hydrophobic layer adjacent to the second side 146 of the continuous Lane 140 is arranged.
- the web support layer 142 comprises preferably a felt layer 142A that is integral with a hydrophobic Layer 142B is formed, the hydrophobic layer 142B being water transported away from the continuous web 140 via capillary action, so that it is absorbed by the felt layer 142A (see Fig. 6).
- the hydrophobic layer 142B provides an effect of post-wetting protection ready, which prevents water from getting back into the continuous path 140 flows.
- the relative sizes of the applied to the continuous web 140 mechanical pressure is caused by factors such as the chamber pressure in chamber 112, the permeability of the semipermeable Membrane 20 and the permeability of the continuous web 140.
- the fluid flow, preferably air, through the continuous path 140 is influenced by factors such as that Chamber pressure in chamber 112, the permeability of the semipermeable Membrane 20 and the size (e.g. length) of chamber 112.
- the dynamic Fluid pressure in the pressurized chamber 112 is on the Basis for monitoring the chamber pressure through the sensor structure 126 controlled.
- Sensor assembly 126 senses pressure within the Chamber 112 and provides a pressure feedback signal to the controller 120.
- Controller 120 processes the pressure feedback signal to generate a pressure output signal that is supplied to the fluid source 124 to selectively control their fluid output and thus pressure the pressurized chamber 112 at a predetermined pressure, preferably a pressure greater than 30 psi above the pressure of the differential pressure source 125 lies to control. If a temperature in relation to a pressure within the pressurized chamber 112 of It is important that the sensor assembly 126 can be adapted such that it detects a temperature within chamber 112 and a temperature feedback signal supplies. Controller 120 processes the temperature feedback signal together with the pressure feedback signal, to generate output signals that are supplied to the fluid source 124, to the pressure and temperature in the pressurized To regulate chamber 112.
- the controller 120 also controls the load on the main rollers 60, 62 by the platen rollers 64, 66 by controlling a print size that the load cylinder 14 on the upper and lower swivel arms 28, 30 applies.
- the load size of the main rollers 60, 62 is preferably related to a pressure in the pressurized chamber 112, which is monitored by a pressure sensor of sensor assembly 126 becomes.
- the load can be a preload in addition to a load include, which is proportional to the pressure in the chamber 112.
- the end seal of the Chamber 112 maintain and wear between the sealing plates 108, 110 and the rollers 60, 62, 64 and 66 to prevent a lubricating and sealing fluid, such as air or water, or any viscous fluid in a plurality of sealing openings 148 via a line ring 150 are pressed in, with a fluid source 152 via a Line 153 is coupled.
- the pressure fluid source 152 is electrical with the Controller 120 coupled via an electrical cable 155 and is controlled thereby.
- the sealing openings 148 in the sealing plates 108, 110 are arranged so that they face the ends of the rollers 60, 62, 64, 66 are to pressurized lubricating and sealing fluid between the sealing plates 108, 110 and parts of the respective forward circular ends 68, 70, 72, 74 and 76, 78, 80, 82.
- the size of the leak is due to the careful Selection of distance tolerances and the lubricating and sealing fluid so controllable that it is small.
- main roller 62 is also intended to be vented to a differential pressure source and that the continuous path 140 together with the membrane 20 is such that it passes through all four columns run out, such as into gap 106 Gap 104 out, into gap 100 and out of gap 102 to the Increase residence time over which the membrane 20 with the continuous Lane 140 interacts.
- Fig. 5 shows a further variant of the invention, in which the end seal chamber 112 is improved by fluid openings 154 in sealing plates 108, 110 are arranged so that they are close to the Ends of the rollers 60, 62, 64, 66 but not arranged facing them are.
- a lead ring 156 is coupled to openings 154 and is coupled to fluid source 152 via line 158 to provide lubrication and Sealing fluid, such as air or water, or any other viscous Fluid through openings 154 into chamber 112 feed.
- Fluid source 152 is electrical with controller 120 coupled via electrical cable 155 and is thereby controlled.
- the added fluid pushes between the circular ones Ends 68, 70, 72, 74 and 76, 78, 80, 82 of the rollers 60, 62, 64, 66 or the sealing plates 108, 110, thereby allowing the Sealing plates 108, 110 float over the circular ends.
- the leakage is controlled by the distance between the circular ends 68, 70, 72, 74 or 76, 78, 80, 82 of the rollers 60, 62, 64, 66 or sealing plates 108, 110 controlled in this way there is no excessive leakage in any area, and that excessive wear between the sealing plates 108, 110 and rollers 60, 62, 64, 66 is prevented.
- FIG. 6 shows a further variant of the invention, in which a main roller 160, which has the profile shown, would replace the main roller 60.
- the main roller 160 includes a first circular end 162, a second circular end 164, a first cylindrical end surface 166 and a second cylindrical end surface 168, a first inclined ring surface 170, a second inclined ring surface 172 and a cylindrical middle surface 174.
- the first cylindrical end surface 166 is disposed adjacent to the first circular end 162 and the second cylindrical end surface 168 is disposed adjacent to the second circular end 164.
- the cylindrical central surface 174 has a circumference that is smaller than the circumference of the first and second cylindrical end surfaces 166, 168.
- the first inclined ring surface 170 provides a transition from the cylindrical center surface 174 to the first cylindrical end surface 166
- the second inclined ring surface 172 provides a transition from the cylindrical center surface 174 to the second cylindrical end surface 168.
- the width of the cylindrical central surface 174 is selected such that it is approximately equal to the width of the membrane 20.
- the first and second inclined ring surfaces 170, 172 define a guide path for the membrane 20, the continuous web 140 and the web support layer 142.
- Each of the membrane 20 and the web support layer 142 preferably includes two tapered outer edges that define the first and second inclined ring surfaces Touch 170, 172.
- permeable membrane 20 includes two tapered, impervious, longitudinally extending outer edges 20A, 20B formed adjacent a semi-permeable portion 20C to improve sealing along inclined ring surfaces 170, 172.
- the web carrier layer 142 also preferably comprises a felt layer 142A and a hydrophobic layer 142B.
- the web support layer 142 may include two impermeable, longitudinally extending outer edges that contact the first and second inclined ring surfaces 170, 172.
- a press assembly 200 has a roll assembly 201 with several Rollers 202, 204, 206, 208 includes, which in a square pattern for interacting rotation when processing a first continuous Web 209, such as a paper web on a web Web carrier layer 210 is entrained, and a second continuous Web 212, such as a paper web, on a web support layer 214 is taken, is arranged.
- the web support layers 210, 214 can be felt layers, for example.
- Each of the plurality of rollers 202, 204, 206, 208 is from the previous one described as main rollers 60, 62 and / or 160 and pressure rollers 64, 66 Type and is therefore not described in detail again. It is also to understand that sealing plates of the same general type, as described above with respect to the sealing plates 108 and 110 were in the manner described above with reference to FIGS. 4 and 5 would be used to define a chamber 216. The control and pressure source connections for chamber 216 and the associated one Operations are as described above with reference to Figures 1-4 was, which is therefore not repeated here.
- rollers 202 and 204 will be the main rollers and rollers 206, 208 are referred to as pressure rollers, although in the present embodiment rollers 202, 204, 206, 208 are approximately the same size.
- the main rollers 202, 204 and the platen rollers 206, 208 are arranged to be plural Define nips 220, 222, 224, 226, of which on the Basis of rotation of main roller 202 in the direction of arrow 230 direction shown the nips 220, 224 inlet nips of the Form press assembly 200 and nips 222, 226 outlet nips form.
- the first continuous web 209 and the first web support layer 210 enter inlet gap 220 and pass through chamber 216 processed around the circumference of the main roller 202.
- the second continuous web 212 and second web support layer 214 enter inlet gap 224 and are circulated through chamber 216 processed around the circumferential surface of the main roller 204.
- the first web support layer 210, the continuous path 209, the continuous path 212 and the second web support layer 214 are through the outlet nip 222 processed therethrough to form a laminated web 228 made of the continuous paths 209, 212.
- the second continuous path 212 remains due to the surface tension or due to ventilation in the main roller 202 through holes, Grooves or pores in the cylindrical surface of the main roller 202 are formed in contact with the first continuous path 209.
- the second continuous web 212 and the second web support layer 214 through onto the continuous web 209 applied coating layer could be replaced.
- a press assembly 300 comprises a roller assembly 301 with a plurality of rollers 302, 304, 306, 308, 310 and 312, which for interacting rotation when processing a continuous Web 314, such as a paper web, are arranged.
- Each Roller 302, 304 is of the type previously described as main roller 60 and / or 160 Kind and is with a differential pressure source in a way fluid-coupled, which is described above.
- Rollers 306, 308, 310, 312 are from the above regarding non-vented main and pressure rollers, such as the main roller 62 and the pressure roller 64 Type and are therefore not described in detail again.
- sealing plate 316 of the same general type as above with respect to the sealing plates 108 and 110, and can be used in the manner described above with reference to FIGS. 4 and 5 become.
- rollers 302 and 304 will be the main rollers and rollers 306, 308, 310 and 312 are referred to as Called pressure rollers, due to their respective main function within a given chamber with respect to continuous path 314.
- the rollers 302, 304, 306, 308, 310 and 312 are approximately the same size.
- the main rollers 302, 304 and pressure rollers 306, 308, 310, 312 are arranged such that they define multiple nips 320, 322, 324, 326, 328, 330, 332 the basis of which is a rotation of the main roller 302 in the direction indicated by the arrow 334 shown the nips 320, 326, 330 inlet nips of the press assembly 300 form the nips 322, 328, 332 Outlet nips form and nip 324 a chamber split nip is.
- the orientation and / or size of the rollers 302, 304, 306, 308, 310 and 312 can be modified such that the nips are arranged in the desired locations and the efficiency of the Processing is optimized.
- the sealing plates 316 together with the rollers 302 define 304, 306, 308, 310 and 312 a first chamber 336 and a second Chamber 338, each chamber having at least one inlet gap and at least one an outlet gap is assigned.
- a first pressure source 340 is connected to a chamber 336 via a line 342 fluidly coupled, and a second pressure source 344 is with a chamber 338 fluidly coupled via a line 346.
- the lines 342 and 346 extend each from the sealing plate 316 into the chambers 336 or 338 to distribute fluid flow therein.
- the controller 120 is electrically coupled to pressure source 340 via an electrical cable 348 and is electrical with pressure source 344 via an electrical cable 350 coupled.
- a sensor assembly 352 is electrical with the controller 120 connected via an electrical cable 354. The sensor assembly 352 is such designed to measure the pressure and temperature of each chamber 336, 338 monitors.
- the press assembly 300 further includes a first semipermeable membrane 360 and a second semipermeable membrane 362.
- the membranes 360, 362 interact with the peripheral surfaces of the main rollers 302, 304, around a first extended gap 364 and a second to define extended gap 366.
- the extended gap 364 is located is in the first chamber 336 and the extended gap 366 itself in the second chamber 338.
- the continuous path 314 includes a first side 370 and a second Page 372. While in chamber 336, a fluid flows through continuous path 314 in a first direction from the first side 370 to the second side 372 on the extended one Gap 364. While in chamber 338, fluid flows through the continuous path 314 in a second direction that is opposite to the first direction, from the second side 372 to the first Page 370 at the extended gap 364.
- a first membrane 360 is in communication with the first chamber 336 and the main roller 302 to a mechanical pressing force on the continuous path 314 in the first Direction, i.e. to apply from the first side 370 to the second side 372.
- a second membrane 362 stands with the second chamber 338 and the main roller 304 in connection to a mechanical pressing force continuous path 314 in the second direction, i.e. from the second Page 372 to the first page 370.
- the Membranes 360, 362 each with the respective pressurized Chambers 336, 338 and the respective main rollers 302, 304 in connection, around a predetermined fluid flow in combination and a mechanical pressing force on the continuous web 314 in cause two directions and thus improved drainage to promote the continuous path 314.
- the main rollers 302, 304 each include at least one White space, such as a hole, a groove or a pore, to a pressure difference over the continuous path 314.
- each of the first semipermeable membranes 360 and the second semipermeable membrane 362 from a molded fabric approximately 2.54 mm (0.1 inch) or less thick and semi-permeable, by a plurality of interconnecting pores 117 in the Shaped fabrics formed with a size, shape, frequency and / or pattern are chosen such that the desired permeability is created as described more fully above in connection with membrane 20 is.
- each of the first semipermeable Membrane 360 and the second semipermeable membrane 362 chosen to be greater than zero and less than approximately 0.025 m / s (five CFM per square foot) is as by the TAPPI test procedure TIP 0404-20 measured, and especially greater than zero and less than is approximately 0.01 m / s (two CFM per square foot).
- the press assembly 300 further includes a first web support layer 361 and a second web support layer 363, each on opposite sides of the continuous web 314 are arranged.
- the first web support layer 361 is between membrane 362 and rollers 302 and 312
- the second web support layer 363 is between the membrane 360 and the membrane Rollers 306 and 304 arranged.
- the first web support layer 361 may be arranged such that it is between the continuous Web 314 and membrane 362, and the second web support layer 363 can be arranged such that it is between the continuous Lane 314 and membrane 360 lies.
- each is the Web support layers 361, 363 are an integral fabric that is a layer of felt and a hydrophobic layer with a total thickness of approximately 2.54 mm (0.1 inch) or less, and is oriented such that the hydrophobic layer facing the continuous web 314.
- the extended columns 364 and 366 essentially have the same length.
- the gap lengths can vary be what can be effected, for example, by main rollers chosen with different sizes and / or by the circumference size is changed by any one or more of the pressure rollers to effectively the location of one or more nips 320, 324 and 328 to change.
- each of the first chamber 336 and the second Chamber 338 is individually controlled by controller 120 and can be pressurized to different pressures.
- the chamber 338 is preferably at a pressure greater than the chamber pressure 336 pressurized.
- Such materials can include dry air, Steam or gas, water or other fluid.
- the temperatures of the chambers 336, 338 on the control the same or possibly different temperatures. 8 also shows a temperature control unit 374, which is connected via lines 376, 378 is fluidly coupled to respective chambers 336, 338 the chambers 336, 338 a heating or cooling fluid, such as air, feed.
- the temperature control unit 374 is electrical with the controller 120 coupled via an electrical cable 380.
- Controller 120 receives Temperature signals representing the temperatures of the chambers 336, 338 from the sensor assembly 352. The controller 120 uses then these temperatures based on temperature output signals of predefined target temperatures to be generated by the temperature control unit 374 are supplied.
- the temperature control unit 374 then responds to the temperature output signals to the temperatures of the chambers 336, 338 to regulate.
- the temperature of the chamber 338 is preferably controlled so that it is higher than the temperature of the Chamber 336 is.
- the temperature control of the chambers 336, 338 can be effected by the temperature of each of the first pressure source 340 and / or the second fluid source 344 to the respective chambers 336, 338 supplied fluids is regulated.
- the temperature control unit 374 can be eliminated.
- FIG. 9 shows a part of the roller arrangement 400, which has a main roller 402 and a platen roller 404 instead of those previously described Main rollers or pressure rollers can be used.
- the main roller 402 has a general structure similar to that of the Main roller 160 shown in FIG. 6 corresponds. While in Fig. 9 only one right end portion 406 of main roller 402 is shown that the left end of roller 402 is a mirror image of right end 406 and thus the same reference numerals used to denote the to describe the right end 406 for the left end of the main roller 402 will apply.
- the main roller 402 includes a cylindrical central surface 408, left and right right circular ends 410, left and right cylindrical end faces 412 and left and right inclined ring surfaces 414.
- the cylindrical End faces 412 are arranged next to respective circular ends 410.
- the cylindrical central surface 408 has a circumference that is smaller than the circumference of the cylindrical end faces 412.
- the inclined ring surfaces 414 provide a transition from the cylindrical central surface 408 to the cylindrical end faces 412.
- the cylindrical middle surface 408 includes at least one void, such as a groove, hole, or one Pore to a pressure difference across the membrane 20 and any intermediate To lighten material.
- the distance between the inclined ring surfaces 414 of the main roller 402 is chosen such that it is approximately equal to the width of the semipermeable Membrane 20 is.
- the inclined ring surfaces 414 define a guide path for the semipermeable membrane 20 and the web carrier layer 142.
- each of the semipermeable membranes 20 and the web support layer 142 two tapered outer edges, which the inclined Touch ring surfaces 414.
- the semipermeable particularly preferably comprises Membrane 20 two tapered, impervious, lengthways extending outer edges 20A, 20B (see Fig. 6) to the seal along the inclined ring surfaces 414.
- the web support layer 142 includes a felt layer 142A and a hydrophobic one Layer 142B.
- the profiles of the semipermeable membrane 20 and the Web support layer 142 are preferably dimensioned such that they in the Roll profile of the main roll 402 between the inclined ring surfaces 414 fit so that the membrane 20 and the cylindrical end surfaces 412 in have essentially the same circumferential height.
- Interchangeable end seals 416 are at the circular ends 410 attached that include multiple fluid cavities 418. The attachment is caused by glue or fasteners.
- the interchangeable End seals 416 are preferably made of an elastic material, such as rubber, and can be a reinforcing fabric, such as nylon or steel.
- the platen roller 404 comprises a generally cylindrical structure that corresponds to that of the pressure roller 64 shown in FIGS. 1-3. While only a right end portion 420 of the platen roller 404 shown in FIG. 9 it can be seen that the left end of the platen 404 is a mirror image of the right end is 420 and thus the same reference numerals, which are used to describe the right end 420 for which left end of the platen roller 404 will apply.
- the platen roller 404 includes a cylindrical central surface 422 and left and right circular ends 424.
- a sealing sleeve 426 with a Inner surface 428 and an outer surface 430 is over the cylindrical Middle surface 422 recorded and in a fixed relationship with the Pressure roller 404 held due to frictional forces between the cylindrical middle surface 422 and the inner surface 428 of the sealing sleeve 426 act.
- the sealing sleeve 426 can be glued or by fasteners located under the outer surface 430 of the Sealing sleeve 426 arranged and in the cylindrical central surface 422 are added to be held in their place.
- each sealing sleeve 426 is interchangeable such that when the Sealing sleeve 426 shows an unacceptable amount of wear, the sealing sleeve 426 without the need to press roller 404 to throw away, can be exchanged.
- the sealing sleeve 426 comprises a stress layer 432 and a plurality of fluid cavities 434.
- Interchangeable end seals 436 are at the circular ends 424 attached, which comprise a plurality of fluid cavities 438. The attachment is effected by means of glue or fasteners.
- the interchangeable End seals 436 are preferably made of an elastic Material, such as rubber, and can be a reinforcing fabric, such as nylon or steel.
- the sealing sleeve 426 is preferably made of an elastic material, such as rubber.
- the stress layer 432 of the sealing sleeve 426 is used to reduce the hoop or strapping tension and / or stresses on the sealing sleeve 426 to hold over the machine and includes a reinforcing fabric such as nylon or steel.
- the size, shape and geometry the fluid cavities 434 are selected such that they in particular in the vicinity of the longitudinally extending edges 20A, 20B of FIG semipermeable membrane 20 are elastically deformable.
- the fluid cavities 434 either extend circumferentially the sealing sleeve 426 around in a repeated pattern Width of the platen 404, or across the width of the platen 404 in a repeated pattern around the circumference of the sealing sleeve 426 around.
- the cavities 434 can be diagonal extend around the sealing sleeve 426.
- the fluid cavities 434 are filled with a fluid, such as air, Water or gel, pressurized to be a compliant but firm Seal with the semipermeable membrane 20 around the cylindrical Main end surfaces 412 of the main roller 402 maintain.
- a fluid such as air, Water or gel
- the fluid cavities 434 at the time of manufacture the sealing sleeve 426 is pressurized.
- the compressed air cavities 434 at the time the sealing sleeve is manufactured 426 not pressurized, but rather the sealing sleeve 426 include one or more valve port (s) 440, such as for example the type that is commonly used to introduce air into one Initiate pneumatic tires to absorb fluid and thus the cavities To put 434 under pressure.
- valve opening (s) 440 open openings that communicate with a fluid source via a fluid line and a rotatable fluid coupling are connected. In some applications it may be desirable to close fluid cavities 434 together connect to distribute any external forces and effectively form a single cavity.
- the fluid cavities 418, 438 of the replaceable end seals 416, 436 are pressurized with a fluid such as air, water or gel.
- a fluid such as air, water or gel.
- the size, shape and geometry of the cavities 418, 438 are selected in such a way that they are resiliently deformable to be a compliant but firm Seal between the interchangeable end seals 416, 436 and with the associated sealing plates, such as sealing plates 108, 110 of Fig. 3.
- fluid cavities 418, 438 at the time the end seals are made 416, 436 pressurized.
- the fluid cavities 418, 438 at the time of making the end seals 416, 436 not pressurized.
- the interchangeable ones End seals 416, 436 each have one or more valve opening (s) 442, 444 include, such as the type commonly used for this to inject air into a pneumatic tire to absorb fluid and thus pressurizing cavities 418, 438.
- the fluid cavities 418 may be desired to be interconnected to connect or to connect the fluid cavities 438 together. The Connecting the cavities effectively forms a single cavity in order any external forces within the single formed Distribute cavity.
- the respective membrane can be seen in FIGS. 1 to 10.
- Such a membrane can, however, in particular also in the embodiments according to FIGS. 12 and 13.
- the membrane expediently again at the higher pressure Arranged side of the fibrous web.
- the membrane can be, for example, one made of film material with through holes existing membrane can be used.
- the pressure of the displacement fluid acting on the membrane is preferably greater than the ambient pressure.
- a membrane can also be used, such as they are described in connection with the first aspect of the invention has been.
- the membrane can in particular be provided with coherent pores his.
- the fibrous web 12 can in particular be a paper or Trade cardboard web.
- the drainage device 10 comprises a drainage zone E, in of the fibrous web 13 at least partially by exposure with pressurized displacement fluid, in particular displacement gas 14, is drained.
- the fibrous web 12 becomes together with a membrane 16 and a sieve or felt belt 18 through the Dewatering device 10 performed, the fibrous web 12 through through the membrane 16 with the displacement gas 14 becomes.
- the screen or felt belt 18 is on the opposite side the fibrous web 12. The fibrous web 12 is thus between the Gas pressure applied membrane 16 and the sieve or felt belt 18th led through the drainage zone E.
- the drainage zone comprises E a displacement drainage unit 20 supplying the gas pressure, the with its gas outlet side 25 one formed, for example, by a roller Counter surface 24 is opposite to this one in the web running direction L to form an elongated gap 26 through which the membrane 16, the sieve or felt belt 18 and the intermediate fibrous web 12 are passed through.
- the dewatering zone E is divided into several sections in which the gas pressure applied can be set individually.
- three such sections E1, E2 and E3 are provided, for example.
- any other number of sections is also possible.
- four or more sections are also conceivable.
- the pressures prevailing in the different sections E1, E2 and E3 are identified in FIG. 10 with p 1 , p 2 and p 3 .
- the different sections egg i.e. in the present embodiment the sections E1, E2 and E3 can be sectioned across the width be, i.e. different pressures can be provided across the width his.
- the counter surface 24 can be closed, open (grooved,%) Or permeable his.
- a box 28 can be arranged behind the counter surface 24, which holds the liquid and / or absorbs the gas.
- the box 28 can be vacuumed, i.e. be provided as a suction box.
- L again several zones Si are provided, which have different Pressures (e.g. overpressure and / or suppress) can.
- At positions 30 is, for example liquid or gas can be removed.
- FIG. 11 has at least essentially again the same structure as that of Fig. 10. Corresponding to each other Parts are assigned the same reference symbols.
- the result of the displacement drainage process in terms of final dryness and paper technology properties of the finished fibrous web 12 such as the specific volume, the porosity, the surface roughness and / or the like can be controlled in a targeted manner.
- the applied gas pressure can be varied in the desired manner along the dewatering zone.
- the drainage process can be stopped directly during operation become. For example, gentle initial drainage at a low gas pressure. Becomes a high final dryness required so that the gas pressure in the rear sections the drainage zone E can be increased accordingly. Will be against high volume required for the finished fibrous web 12, so the Corresponding gas pressure in the rear sections of the drainage zone E. be set low. It is therefore also a particular one Pressure profile, for example, adjustable in the machine direction.
- a membrane can be used in particular, such as they are described in connection with the first aspect of the invention has been.
- the membrane can in particular also be connected again Pores.
- Fibrous web 12 shows a schematic representation of a first embodiment of a Device 10 for dewatering a fibrous web 12.
- Fibrous web 12 can in particular be a paper or cardboard web act.
- the drainage device 10 includes a displacement drainage zone E, in which the fibrous web 12 at least partially by a Exposure to displacement fluid, here e.g. Displacement gas 14, is drained.
- a Exposure to displacement fluid here e.g. Displacement gas 14
- a press 16 is connected upstream of the displacement drainage zone E.
- the fibrous web 12 is first through the upstream press 16 and then passed through the displacement drainage zone E.
- the upstream press is 16 formed by a shoe press.
- the fibrous web 12 is guided through the press 16 and the displacement dewatering zone E together with a screen or felt belt 18.
- the dewatering zone E comprises a displacement dewatering unit 20 which, with its gas outlet side, is opposite a counter-roller 22, via which the fibrous web 12 loaded with displacement gas 14 and the wire or felt belt 18 are guided.
- FIG. 13 differs from that of FIG. 12 only in that upstream of the displacement drainage zone E. Press 16 'a roller press is provided. Otherwise owns this drainage device 10 has the same structure as that in FIG 12 shown device. Corresponding parts are assigned the same reference numerals.
- a downstream mechanical press can also be provided his.
- the extent the leaf compression and the amount of gas pressure applied separately to be controlled is particularly possible to determine the result of the Displacement drainage process in relation to the final dryness and paper technology properties of the finished fibrous web such as specific volume, porosity, surface roughness and / or the to control the like.
- the nonwoven to the desired Be precompacted can increase the permeability of the nonwoven fabric can be set in the desired manner.
- the properties of the finished paper can be set specifically. If the fleece is heavily pre-compacted, more water can be removed from the fleece be removed. This is particularly necessary with such types of paper where primarily a high dry content after the press is required.
- a membrane can be used in particular, such as they are described in connection with the first aspect of the invention has been.
- the membrane can in particular also be connected again Pores.
Landscapes
- Paper (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
- Fig. 1
- eine teilweise schematische Seitenansicht einer Ausführungsform der vorliegenden Erfindung,
- Fig. 2
- eine perspektivische Seitenansicht der Anordnung der Walzen der Ausführungsform von Fig. 1,
- Fig. 3
- eine Teilfrontansicht der Anordnung der Walzen der Ausführungsform von Fig. 1,
- Fig. 4
- eine schematische Darstellung einer Variante einer Endabdichtungsplatte der vorliegenden Erfindung,
- Fig. 5
- eine schematische Darstellung einer Variante einer weiteren Endabdichtungsplatte der vorliegenden Erfindung,
- Fig. 6
- eine in übertriebenem Maßstab dargestellte Seitenansicht einer Variante eines Hauptwalzenprofils der Erfindung,
- Fig. 7
- eine schematische Darstellung einer Variante der Ausführungsform mit einer einzigen Kammer von Fig. 1,
- Fig. 8
- eine schematische Darstellung einer Ausführungsform der Erfindung, die zwei Kammern umfaßt,
- Fig. 9
- eine Explosionsteilschnittansicht, die Kammerabdichtungsaspekte der vorliegenden Erfindung veranschaulicht,
- Fig. 10
- eine schematische Darstellung einer ersten Ausführungsform einer Vorrichtung zur Entwässerung einer Faserstoffbahn,
- Fig. 11
- eine schematische Darstellung einer weiteren Ausführungsform einer Vorrichtung zur Entwässerung einer Faserstoffbahn,
- Fig. 12
- eine schematische Darstellung einer ersten Ausführungsform einer Vorrichtung zur Entwässerung einer Faserstoffbahn und
- Fig. 13
- eine schematische Darstellung einer weiteren Ausführungsform einer solchen Entwässerungsvorrichtung.
Die Breite der zylindrischen Mittelfläche 174 ist derart gewählt, daß sie annähernd gleich der Breite der Membran 20 ist. Die erste und die zweite geneigte Ringfläche 170, 172 definieren eine Führungsstrecke für die Membran 20, die kontinuierliche Bahn 140 und die Bahnträgerschicht 142. Eine jede der Membran 20 und der Bahnträgerschicht 142 umfaßt vorzugsweise zwei verjüngte Außenränder, die die erste und die zweite geneigte Ringfläche 170, 172 berühren. Insbesondere bevorzugt umfaßt die permeable Membran 20 zwei verjüngte, undurchlässige, sich in Längsrichtung erstreckende Außenränder 20A, 20B, die neben einem semipermeablen Teil 20C gebildet sind, um die Abdichtung entlang der geneigten Ringflächen 170, 172 zu verbessern. Ebenso bevorzugt umfaßt die Bahnträgerschicht 142 eine Filzschicht 142A und eine hydrophobe Schicht 142B. Wahlweise kann die Bahnträgerschicht 142 zwei undurchlässige, sich in Längsrichtung erstreckende Außenränder umfassen, die die erste und die zweite geneigte Ringfläche 170, 172 berühren.
Die Entwässerungszone E umfaßt beim vorliegenden Ausführungsbeispiel eine Verdrängungsentwässerungseinheit 20, die mit ihrer Gasaustrittsseite einer Gegenwalze 22 gegenüberliegt, über die die mit Verdrängungsgas 14 beaufschlagte Faserstoffbahn 12 und das Sieb- oder Filzband 18 geführt sind.
Claims (54)
- Einheitliche Membran zur Verwendung in einer Preßvorrichtung mit:zwei sich in Längsrichtung erstreckenden Randabschnitten, undeinem semipermeablen Abschnitt mit mehreren miteinander in Verbindung stehenden Poren, wobei der semipermeable Abschnitt zwischen den beiden sich in Längsrichtung erstreckenden Randabschnitten angeordnet ist,
wobei die einheitliche Membran ein Formgewebe umfaßt, die einheitliche Membran eine Dicke von weniger als ungefähr 2,54 mm (0,1 Zoll) aufweist und der semipermeable Abschnitt eine Permeabilität aufweist, die größer als Null und kleiner als ungefähr 0,025 m/s (fünf CFM pro Quadratfuß) ist, wie durch das TAPPI-Testverfahren TIP 0404-20 gemessen. - Einheitliche Membran nach Anspruch 1,
dadurch gekennzeichnet, daß
der semipermeable Abschnitt eine Permeabilität aufweist, die größer als Null und kleiner als ungefähr 0,01 m/s (zwei CFM pro Quadratfuß) ist, wie durch das TAPPI-Testverfahren TIP 0404-20 gemessen. - Einheitliche Membran nach Anspruch 1,
dadurch gekennzeichnet, daß
die Permeabilität durch mindestens einen Faktor der Faktoren Größe, Form, Häufigkeit und Muster einer Vielzahl von Poren in dem semipermeablen Abschnitt bestimmt ist. - Einheitliche Membran nach Anspruch 1,
dadurch gekennzeichnet, daß
die beiden sich in Längsrichtung erstreckenden Randabschnitte derart verjüngt sind, daß der Querschnitt der einheitlichen Membran trapezförmig ist. - Einheitliche Membran nach Anspruch 1,
dadurch gekennzeichnet, daß
die beiden sich in Längsrichtung erstreckenden Randabschnitte undurchlässig sind. - Einheitliche Membran nach Anspruch 1,
dadurch gekennzeichnet, daß
das Formgewebe eine Strömungswiderstandsschicht in der Nähe einer Oberfläche der einheitlichen Membran bildet. - Einheitliche Membran nach Anspruch 6,
dadurch gekennzeichnet, daß
die einheitliche Membran eine Fluidverteilungsschicht neben der Strömungswiderstandsschicht umfaßt. - Einheitliche Membran nach Anspruch 1,
dadurch gekennzeichnet, daß
sie eine abriebbeständige Oberfläche umfaßt. - Einheitliche Membran nach Anspruch 1,
dadurch gekennzeichnet, daß
der semipermeable Abschnitt einen Leerraumprozentsatz von weniger als 40 Prozent aufweist. - Verfahren zum Herstellen einer einheitlichen Membran zur Verwendung in einer Preßvorrichtung mit den Schritten, daß:ein Trägergewebe bereitgestellt wird, das sehr permeabel ist, undmehrere miteinander in Verbindung stehende Poren in dem Trägergewebe gebildet werden.
- Verfahren nach Anspruch 10,
dadurch gekennzeichnet, daß
der Bildungsschritt die Schritte umfaßt, daß:über Wärme schmelzbare und nicht über Wärme schmelzbare Fasern gemischt werden,die Fasermischung in das Trägergewebe eingenäht wird, und Wärme aufgebracht wird, um die über Wärme schmelzbaren Fasern zu schmelzen, die Leerräume in der Form von miteinander in Verbindung stehenden Poren zurücklassen. - Verfahren nach Anspruch 11,
dadurch gekennzeichnet, daß
der Nähschritt den Schritt umfaßt, daß:die Fasermischung innerhalb des Gewebeträgers in der Nähe seiner Oberfläche aufgebracht wird, um eine Strömungswiderstandsschicht in der Nähe der Oberfläche der einheitlichen Membran zu bilden. - Verfahren nach Anspruch 12,
dadurch gekennzeichnet, daß
es den Schritt umfaßt, daß eine Strömungsverteilungsschicht in der einheitlichen Membran definiert wird, die die von der Widerstandsschicht aufgenommene Fluidströmung verteilt. - Verfahren nach Anspruch 10,
dadurch gekennzeichnet, daß
es den Schritt umfaßt, daß zwei undurchlässige, sich in Längsrichtung erstreckende Randabschnitte gebildet werden. - Verfahren nach Anspruch 10,
dadurch gekennzeichnet, daß
der Bildungsschritt die Schritte umfaßt, daß: eine Widerstandsschicht gebildet wird, und eine Fluidverteilungsschicht gebildet wird. - Verfahren nach Anspruch 10,
dadurch gekennzeichnet, daß
der Bildungsschritt den Schritt umfaßt, daß nacheinander eine Beschichtung auf das Trägergewebe aufgebracht wird, bis die gewünschte Permeabilität erreicht ist. - Verfahren nach Anspruch 16,
dadurch gekennzeichnet, daß
es den Schritt umfaßt, daß die Beschichtungsart verändert wird, um die Permeabiität einzustellen. - Verfahren nach Anspruch 16,
dadurch gekennzeichnet, daß
es den Schritt umfaßt, daß Luft in die Beschichtung hinein mitgerissen wird, um die Permeabilität einzustellen. - Verfahren nach Anspruch 16,
dadurch gekennzeichnet, daß
es den Schritt umfaßt, daß der Feststoffgehalt der Beschichtung eingestellt wird, um die Permeabilität einzustellen. - Verfahren zur Entwässerung einer Faserstoffbahn, insbesondere einer Papier- oder Kartonbahn, bei dem die Faserstoffbahn durch eine Entwässerungszone geführt wird, in der sie zumindest teilweise durch eine Beaufschlagung mit unter Druck stehendem Verdrängungsfluid, insbesondere Verdrängungsgas, entwässert wird, wobei die Faserstoffbahn zusammen mit einer porösen Membran durch die Entwässerungszone geführt und durch die Membran hindurch mit dem Verdrängungsfluid beaufschlagt wird.
- Verfahren nach Anspruch 20,
dadurch gekennzeichnet,
daß als Membran eine aus Folienmaterial mit Durchgangslöchern bestehende Membran verwendet wird. - Verfahren nach Anspruch 20 oder 21,
dadurch gekennzeichnet,
daß der Druck des die Membran beaufschlagenden Verdrängungsfluids größer ist als der Umgebungsdruck. - Verfahren nach einem der Ansprüche 20 bis 22,
dadurch gekennzeichnet,
daß als Membran eine Membran gemäß einem der Ansprüche 1 bis 9 verwendet wird. - Verfahren nach einem der Ansprüche 20 bis 22,
dadurch gekennzeichnet,
daß als Membran eine gemäß dem Verfahren nach einem der Ansprüche 10 bis 19 hergestellte Membran verwendet wird. - Verfahren zur Entwässerung einer Faserstoffbahn (12), insbesondere einer Papier- oder Kartonbahn, bei dem die Faserstoffbahn (12) durch eine Entwässerungszone (E) geführt wird, in der sie zumindest teilweise durch eine Beaufschlagung mit unter Druck stehendem Verdrängungsfluid (14), insbesondere Verdrängungsgas, entwässert wird,
dadurch gekennzeichnet,
daß die Entwässerungszone (E) in mehrere Sektionen (E1, E2, E3) unterteilt wird, in denen der angelegte Fluid- bzw. Gasdruck individuell einstellbar ist. - Verfahren nach Anspruch 25,
dadurch gekennzeichnet,
daß die Faserstoffbahn (12) zusammen mit einer Membran (16) durch die Entwässerungszone (E) geführt wird und daß die Faserstoffbahn (12) durch die Membran (12) hindurch mit dem Verdrängungsfluid bzw. -gas (14) beaufschlagt wird. - Verfahren nach Anspruch 25 oder 26,
dadurch gekennzeichnet,
daß die Entwässerungszone (E) in mehrere in Bahnlaufrichtung (L) hintereinander liegende Sektionen (E1, E2, E3) unterteilt wird, in denen der angelegte Fluid- bzw. Gasdruck individuell einstellbar ist. - Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß die von einer Seite her mit Verdrängungsfluid bzw. -gas (14) beaufschlagte Faserstoffbahn (12) zusammen mit wenigstens einem Sieb- oder Filzband (18) durch die Entwässerungszone (E) geführt wird, das auf der anderen Bahnseite angeordnet ist. - Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß in einer in Bahnlaufrichtung (L) betrachtet vorderen Sektion der Entwässerungszone (E) ein geringerer Fluid- bzw. Gasdruck angelegt wird als in einer in Bahnlaufrichtung (L) betrachtet weiter hinten liegenden Sektion. - Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß in wenigstens einer in Bahnlaufrichtung (L) betrachtet weiter hinten liegenden Sektion der Entwässerungszone (E) ein höherer Fluid- bzw. Gasdruck angelegt wird als in einer in Bahnlaufrichtung (L) betrachtet vorderen Sektion. - Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß zur Erzielung eines relativ hohen Volumens der fertigen Faserstoffbahn (12) in wenigstens einer in Bahnlaufrichtung (L) betrachtet weiter hinten liegenden Sektion der Entwässerungszone (E) ein entsprechend niedriger Fluid- bzw. Gasdruck angelegt wird. - Verfahren nach einem der Ansprüche 25 bis 31,
dadurch gekennzeichnet,
daß als Membran (16) eine Membran gemäß einem der Ansprüche 1 bis 9 verwendet wird. - Verfahren nach einem der Ansprüche 25 bis 31,
dadurch gekennzeichnet,
daß als Membran (16) eine gemäß dem Verfahren nach einem der Ansprüche 10 bis 19 hergestellte Membran verwendet wird. - Vorrichtung (10) zur Entwässerung einer Faserstoffbahn (12), insbesondere einer Papier- oder Kartonbahn, mit einer Entwässerungszone (E), in der die Faserstoffbahn zumindest teilweise durch eine Beaufschlagung mit unter Druck stehendem Verdrängungsfluid (14), insbesondere Verdrängungsgas, entwässert wird, insbesondere zur Durchführung des Verfahrens nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß die Entwässerungszone in mehrere Sektionen (E1, E2, E3) unterteilt ist, in denen der angelegte Fluid- bzw. Gasdruck individuell einstellbar ist. - Vorrichtung nach Anspruch 34,
dadurch gekennzeichnet,
daß die Faserstoffbahn (12) zusammen mit einer Membran (16) durch die Entwässerungszone (E) geführt ist, wobei die Faserstoffbahn (12) durch die Membran (16) hindurch mit dem Verdrängungsfluid bzw. - gas (14) beaufschlagbar ist. - Vorrichtung nach Anspruch 34 oder 35,
dadurch gekennzeichnet,
daß die Entwässerungszone (E) in mehrere in Bahnlaufrichtung (L) hintereinander liegende Sektionen (E1, E2, E3) unterteilt ist, in denen der angelegte Fluid- bzw. Gasdruck (14) individuell einstellbar ist. - Vorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß die von einer Seite her mit Verdrängungsfluid bzw. -gas (14) beaufschlagte Faserstoffbahn (12) zusammen mit wenigstens einem Sieb- oder Filzband (18) durch die Entwässerungszone (E) geführt ist, das auf der anderen Bahnseite angeordnet ist. - Vorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß in einer in Bahnlaufrichtung (L) betrachtet vorderen Sektion der Entwässerungszone (E) ein geringerer Fluid- bzw. Gasdruck anlegbar ist als in einer in Bahnlaufrichtung (L) betrachtet weiter hinten liegenden Sektion. - Vorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß in wenigstens einer in Bahnlaufrichtung (L) betrachtet weiter hinten liegenden Sektion der Entwässerungszone (E) ein höherer Fluid- bzw. Gasdruck anlegbar ist als in einer in Bahnlaufrichtung (L) betrachtet vorderen Sektion. - Vorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß zur Erzielung eines relativ hohen Volumens der fertigen Faserstoffbahn (12) in wenigstens einer in Bahnlaufrichtung (L) betrachtet weiter hinten liegenden Sektion der Entwässerungszone (E) ein entsprechend niedriger Fluid- bzw. Gasdruck anlegbar ist. - Vorrichtung nach einem der Ansprüche 34 bis 40,
dadurch gekennzeichnet,
daß als Membran (16) eine Membran gemäß einem der Ansprüche 1 bis 9 vorgesehen ist. - Vorrichtung nach einem der Ansprüche 34 bis 40,
dadurch gekennzeichnet,
daß als Membran (16) eine gemäß dem Verfahren nach einem der Ansprüche 10 bis 19 hergestellte Membran vorgesehen ist. - Verfahren zur Entwässerung einer Faserstoffbahn (12), insbesondere einer Papier- oder Kartonbahn, bei dem die Faserstoffbahn (12) durch eine Verdrängungsentwässerungszone (E) geführt wird, in der sie zumindest teilweise durch eine Beaufschlagung mit Verdrängungsfluid (14), insbesondere Verdrängungsgas, entwässert wird,
dadurch gekennzeichnet,
daß die Faserstoffbahn (12) überdies durch eine der Verdrängungsentwässerungszone (E) vorgeschaltete Presse (16, 16') geführt wird. - Verfahren nach Anspruch 43,
dadurch gekennzeichnet,
daß als vorgeschaltete Presse eine Schuhpresse (16) verwendet wird. - Verfahren nach Anspruch 43,
dadurch gekennzeichnet,
daß als vorgeschaltete Presse eine Walzenpresse (16') verwendet wird. - Verfahren nach einem der Ansprüche 43 bis 45,
dadurch gekennzeichnet,
daß die Faserstoffbahn (12) zusammen mit einer porösen Membran durch die Verdrängungsentwässerungszone (E) geführt und durch die Membran hindurch mit dem Verdrängungsfluid bzw. -gas beaufschlagt wird. - Verfahren nach Anspruch 46,
dadurch gekennzeichnet,
daß als Membran eine Membran gemäß einem der Ansprüche 1 bis 9 verwendet wird. - Verfahren nach Anspruch 46,
dadurch gekennzeichnet,
daß als Membran eine gemäß dem Verfahren nach einem der Ansprüche 10 bis 19 hergestellte Membran verwendet wird. - Vorrichtung (10) zur Entwässerung einer Faserstoffbahn (12), insbesondere einer Papier- oder Kartonbahn, mit einer Verdrängungsentwässerungszone (E), in der die Faserstoffbahn (12) zumindest teilweise durch eine Beaufschlagung mit Verdrängungsfluid (14), insbesondere Verdrängungsgas, entwässert wird, insbesondere zur Durchführung des Verfahrens nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß der Verdrängungsentwässerungszone (E) eine insbesondere mechanische Presse (16, 16') vorgeschaltet ist und daß die Faserstoffbahn (12) zunächst durch die vorgeschaltete Presse (16, 16') und daraufhin durch die Verdrängungsentwässerungszone (E) geführt ist. - Vorrichtung nach Anspruch 49,
dadurch gekennzeichnet,
daß als vorgeschaltete Presse eine Schuhpresse (16) vorgesehen ist. - Vorrichtung nach Anspruch 49,
dadurch gekennzeichnet,
daß als vorgeschaltete Presse eine Walzenpresse (16') vorgesehen ist. - Vorrichtung nach einem der Ansprüche 49 bis 51,
dadurch gekennzeichnet,
daß die Faserstoffbahn (12) zusammen mit einer porösen Membran durch die Verdrängungsentwässerungszone (E) geführt und durch die Membran hindurch mit dem Verdrängungsfluid bzw. -gas beaufschlagbar ist. - Vorrichtung nach Anspruch 52,
dadurch gekennzeichnet,
daß als Membran eine Membran gemäß einem der Ansprüche 1 bis 9 vorgesehen ist. - Vorrichtung nach Anspruch 52,
dadurch gekennzeichnet,
daß als Membran eine gemäß dem Verfahren nach einem der Ansprüche 10 bis 19 hergestellte Membran verwendet wird.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03016714A EP1362949B1 (de) | 1999-09-30 | 2000-09-21 | Verfahren und Vorrichtung zur Entwässerung einer Faserstoffbahn |
EP03016715A EP1362950B1 (de) | 1999-09-30 | 2000-09-21 | Verfahren und Vorrichtung zur Entwässerung einer Faserstoffbahn |
EP03016713A EP1362948B1 (de) | 1999-09-30 | 2000-09-21 | Verfahren zur Entwässerung einer Faserstoffbahn |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1999146982 DE19946982A1 (de) | 1999-09-30 | 1999-09-30 | Verfahren und Vorrichtung zur Entwässerung einer Faserstoffbahn |
DE19946984 | 1999-09-30 | ||
DE1999146984 DE19946984A1 (de) | 1999-09-30 | 1999-09-30 | Verfahren und Vorrichtung zur Entwässerung einer Faserstoffbahn |
US409794 | 1999-09-30 | ||
US09/409,794 US6645420B1 (en) | 1999-09-30 | 1999-09-30 | Method of forming a semipermeable membrane with intercommunicating pores for a pressing apparatus |
DE19946982 | 1999-09-30 |
Related Child Applications (6)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03016713A Division EP1362948B1 (de) | 1999-09-30 | 2000-09-21 | Verfahren zur Entwässerung einer Faserstoffbahn |
EP03016715A Division EP1362950B1 (de) | 1999-09-30 | 2000-09-21 | Verfahren und Vorrichtung zur Entwässerung einer Faserstoffbahn |
EP03016714A Division EP1362949B1 (de) | 1999-09-30 | 2000-09-21 | Verfahren und Vorrichtung zur Entwässerung einer Faserstoffbahn |
EP03016713.4 Division-Into | 2003-07-22 | ||
EP03016714.2 Division-Into | 2003-07-22 | ||
EP03016715.9 Division-Into | 2003-07-22 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1088933A2 true EP1088933A2 (de) | 2001-04-04 |
EP1088933A3 EP1088933A3 (de) | 2002-08-21 |
EP1088933B1 EP1088933B1 (de) | 2005-04-06 |
Family
ID=27219303
Family Applications (4)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03016714A Expired - Fee Related EP1362949B1 (de) | 1999-09-30 | 2000-09-21 | Verfahren und Vorrichtung zur Entwässerung einer Faserstoffbahn |
EP03016715A Expired - Lifetime EP1362950B1 (de) | 1999-09-30 | 2000-09-21 | Verfahren und Vorrichtung zur Entwässerung einer Faserstoffbahn |
EP03016713A Expired - Fee Related EP1362948B1 (de) | 1999-09-30 | 2000-09-21 | Verfahren zur Entwässerung einer Faserstoffbahn |
EP00120661A Expired - Lifetime EP1088933B1 (de) | 1999-09-30 | 2000-09-21 | Semipermeable Membran mit miteinander in Verbindung stehenden Poren für eine Presse |
Family Applications Before (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03016714A Expired - Fee Related EP1362949B1 (de) | 1999-09-30 | 2000-09-21 | Verfahren und Vorrichtung zur Entwässerung einer Faserstoffbahn |
EP03016715A Expired - Lifetime EP1362950B1 (de) | 1999-09-30 | 2000-09-21 | Verfahren und Vorrichtung zur Entwässerung einer Faserstoffbahn |
EP03016713A Expired - Fee Related EP1362948B1 (de) | 1999-09-30 | 2000-09-21 | Verfahren zur Entwässerung einer Faserstoffbahn |
Country Status (2)
Country | Link |
---|---|
EP (4) | EP1362949B1 (de) |
DE (4) | DE50013312D1 (de) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1298248A1 (de) * | 2001-09-27 | 2003-04-02 | Voith Paper Patent GmbH | Hauptwalze für Luftpresse einer Papiermaschine |
WO2003029558A1 (en) * | 2001-09-27 | 2003-04-10 | Voith Paper Patent Gmbh | An anti-rewet felt for use in a papermaking machine |
DE10159411A1 (de) * | 2001-12-04 | 2003-06-12 | Voith Paper Patent Gmbh | Vorrichtung zur Entwässerung einer Faserstoffbahn |
WO2003054292A1 (en) * | 2001-12-20 | 2003-07-03 | Voith Fabrics Heidenheim Gmbh & Co. Kg | Permeable membrane |
US6875310B2 (en) | 2003-03-26 | 2005-04-05 | Voith Paper Patent Gmbh | Roll configuration for an air press of a papermaking machine |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10304575A1 (de) * | 2003-02-05 | 2004-08-19 | Voith Paper Patent Gmbh | Pressspaltanordnung |
DE102006000053A1 (de) | 2006-02-08 | 2007-08-09 | Voith Patent Gmbh | Verfahren und Maschine zur Herstellung einer Faserstoffbahn |
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AT380907B (de) * | 1981-01-27 | 1986-07-25 | Escher Wyss Gmbh | Nasspresse mit verlaengertem pressspalt fuer papiermaschinen |
FI70952C (fi) * | 1982-10-14 | 1986-10-27 | Valmet Oy | Anordning med laong presszon vid pressbehandling av fiberbana |
US4675079A (en) * | 1982-12-14 | 1987-06-23 | Webster David R | Multi-nip suction press with a four roller closed train |
DD222680A1 (de) * | 1984-04-03 | 1985-05-22 | Wtz Zellstoff Papierind | Verfahren zur entwaesserung von faserstoffbahnen |
DE3728124A1 (de) * | 1987-08-22 | 1989-03-02 | Escher Wyss Gmbh | Entwaesserungspresse mit dampfzufuhr |
US4888096A (en) * | 1987-12-02 | 1989-12-19 | Inotech Process Ltd. | Roll press for removing water from a web of paper using solid grooved roll and compressed air |
DE4028085C1 (de) * | 1990-09-05 | 1992-02-27 | Thomas Josef Heimbach Gmbh & Co, 5160 Dueren, De | |
GB9404960D0 (en) * | 1994-03-15 | 1994-04-27 | Scapa Group Plc | Belt for long nip dewatering presses |
US5700356A (en) * | 1996-01-19 | 1997-12-23 | Lefkowitz; Leonard R. | Air permeable belt for dewatering web in press nip |
DE19653508A1 (de) * | 1996-10-16 | 1998-04-23 | Voith Sulzer Papiermasch Gmbh | Schuhpresse |
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- 2000-09-21 DE DE50013312T patent/DE50013312D1/de not_active Expired - Fee Related
- 2000-09-21 EP EP03016714A patent/EP1362949B1/de not_active Expired - Fee Related
- 2000-09-21 DE DE50013339T patent/DE50013339D1/de not_active Expired - Fee Related
- 2000-09-21 DE DE50013759T patent/DE50013759D1/de not_active Expired - Fee Related
- 2000-09-21 EP EP03016715A patent/EP1362950B1/de not_active Expired - Lifetime
- 2000-09-21 DE DE50009970T patent/DE50009970D1/de not_active Expired - Lifetime
- 2000-09-21 EP EP03016713A patent/EP1362948B1/de not_active Expired - Fee Related
- 2000-09-21 EP EP00120661A patent/EP1088933B1/de not_active Expired - Lifetime
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1298248A1 (de) * | 2001-09-27 | 2003-04-02 | Voith Paper Patent GmbH | Hauptwalze für Luftpresse einer Papiermaschine |
WO2003029558A1 (en) * | 2001-09-27 | 2003-04-10 | Voith Paper Patent Gmbh | An anti-rewet felt for use in a papermaking machine |
US6702924B2 (en) | 2001-09-27 | 2004-03-09 | Voith Paper Patent Gmbh | Main roll for an air press of a papermaking machine |
DE10159411A1 (de) * | 2001-12-04 | 2003-06-12 | Voith Paper Patent Gmbh | Vorrichtung zur Entwässerung einer Faserstoffbahn |
WO2003054292A1 (en) * | 2001-12-20 | 2003-07-03 | Voith Fabrics Heidenheim Gmbh & Co. Kg | Permeable membrane |
US6875310B2 (en) | 2003-03-26 | 2005-04-05 | Voith Paper Patent Gmbh | Roll configuration for an air press of a papermaking machine |
Also Published As
Publication number | Publication date |
---|---|
EP1362949B1 (de) | 2006-08-16 |
EP1362948B1 (de) | 2006-08-09 |
DE50009970D1 (de) | 2005-05-12 |
EP1362950A1 (de) | 2003-11-19 |
EP1362949A1 (de) | 2003-11-19 |
EP1362948A1 (de) | 2003-11-19 |
EP1088933B1 (de) | 2005-04-06 |
DE50013312D1 (de) | 2006-09-21 |
DE50013759D1 (de) | 2006-12-28 |
DE50013339D1 (de) | 2006-09-28 |
EP1088933A3 (de) | 2002-08-21 |
EP1362950B1 (de) | 2006-11-15 |
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