CN102089474A - Method and arrangement in tail threading of a web in the dryer section of a fiber web machine - Google Patents
Method and arrangement in tail threading of a web in the dryer section of a fiber web machine Download PDFInfo
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- CN102089474A CN102089474A CN200980127308.XA CN200980127308A CN102089474A CN 102089474 A CN102089474 A CN 102089474A CN 200980127308 A CN200980127308 A CN 200980127308A CN 102089474 A CN102089474 A CN 102089474A
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- width
- cloth material
- air blowing
- drying cylinder
- vacuum
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G9/00—Other accessories for paper-making machines
- D21G9/0063—Devices for threading a web tail through a paper-making machine
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F7/00—Other details of machines for making continuous webs of paper
Abstract
The invention relates to a method in tail threading in the dryer section of a fiber web machine including successive dryer groups (38). The dryer group (38) includes dryer cylinders (22), turning rolls (24), vacuum boxes (62), one dryer fabric (26) traveling as single fabric run (20) via the dryer cylinders (22) and the turning rolls (24), and in tail threading of the web (34) the end (42) of the web (34) is led at full width through the dryer section (14). In addition, on the side of an opening gap (32) formed by a dryer cylinder (22) and the dryer fabric (26), the full width web (34) is blown off from the dryer cylinder (22), at least at the edges (33, 35) of the web (34). The invention also relates to a corresponding arrangement (28).
Description
Technical field
The present invention relates to a kind of in the drying section of the fiber web machine that comprises continuous cylinder group the method for the afterbody paper injection of width of cloth material, this cylinder group comprises:
-drying cylinder;
-slewing rollers;
-vacuum tank;
-one dryer fabric is advanced via drying cylinder and slewing rollers as single fabric operation (single fabric run); And
-in the afterbody paper injection of width of cloth material, drying section is passed through with overall with in the end of width of cloth material.
The invention still further relates to corresponding device thereof.
Background technology
Single fabric drying portion (single fabric dryer section) is often used as the drying section of fiber web machine.In single fabric drying portion, it is that the paper tail is finished that the afterbody paper injection of width of cloth material (tail threading) uses the paper injection afterbody of width of cloth material usually.Yet, in the guiding of paper tail and particularly in the formation of paper tail, encounter problems sometimes.In addition, when finishing the afterbody paper injection of width of cloth material, need equipment to form the paper tail with the paper tail.Patent US5232555 discloses a kind of with the wide scheme of width of cloth material being transferred to single fabric drying portion from press section of full width.Method according to this patent may can be used in some machines, but this in addition do not attempt as disclosed as yet, this is because the afterbody paper injection is not described in more detail in this patent, in other words, describing is inadequate to those skilled in the art.Problem is about the uncertain of the afterbody paper injection of success and may causes the damage of machine clothing (clothing) and equipment.
Summary of the invention
The purpose of this invention is to provide a kind of in the drying section of fiber web machine the method for the afterbody paper injection of width of cloth material, by this method afterbody paper injection than more reliable in the past.
The characteristic feature of the method according to this invention is on a side of the open type nip that is formed by drying cylinder and dryer fabric, to blow away the width of cloth material of overall with at least from drying cylinder at the edge of width of cloth material.Another object of the present invention is, a kind of novel apparatus of the afterbody paper injection in the drying section of fiber web machine is provided, and by this method, the air blowing consumption can be kept low as much as possible, and not damage successful afterbody paper injection.Characteristic feature according to device of the present invention is, on a side in the open type gap that drying cylinder and drying section afterbody form, at least in the edge of width of cloth material, includes and is used to make full-width web to break away from the air blowing equipment that spurts of drying cylinder.
In the method, in the drying section of fiber web machine, during the afterbody paper injection of width of cloth material, in the drying section of fiber web machine, guide the end of width of cloth material forward.Width of cloth material refers to board web or paper web.Successively, fiber web machine refers to the web forming machine that is used for papermaking or cardboard.Fiber web machine comprises continuous cylinder group, slewing rollers and a dryer fabric, and cylinder group comprises drying cylinder.Dryer fabric moves as single fabric, transmits (closed draw) via drying cylinder and slewing rollers by sealing and advances to another group from one group.In the overall with afterbody paper injection of width of cloth material, drying section is passed through with overall with in width of cloth material end.In addition, full-width web is blown away from drying cylinder in edge at least.Or rather, blow and to occur on the side in drying cylinder and the open type gap of dryer fabric formation.When width of cloth material at least in width of cloth material both sides when drying cylinder is blown away, full-width web can be transferred to along with dryer fabric is advanced.More accurately, width of cloth material is transferred into along with dryer fabric rather than along with drying cylinder is advanced in the open type gap.After near width of cloth material moves to dryer fabric, width of cloth material arrives the drying cylinder subsequently of advancing with dryer fabric.Because width of cloth material has whole width, is overall with in other words, has avoided cut-out paper tail during the afterbody paper injection of width of cloth material.On the other hand, blow by edge at least and realized the reliable width of cloth material afterbody paper injection of overall with.Therefore blow and be directed near the width of cloth material in edge.When air blowing was directed to width of cloth edge edge, width of cloth edge edge broke away from drying cylinder.The both sides execution of therefore blowing and being directed to width of cloth material, described air blowing is from least one opening/nozzle discharge.Because the edge of width of cloth material breaks away from drying cylinder, so the central part of width of cloth material also breaks away from drying cylinder.This disengaging of width of cloth edge edge is basic, just comes from the edge because cause the defective of disconnected paper and tear.
In one embodiment, air blowing also is directed to the center of width of cloth material.Though the edge of width of cloth material should be by blowing along with the most basic zone of dryer fabric from the drying cylinder transfer, be directed to the central part of width of cloth material by making to blow, the overall with afterbody paper injection program of success being further improved.The air blowing that is directed to the central part of width of cloth material helps the afterbody paper injection of success, particularly in wide fiber web machine.
In another embodiment, the air blowing of varying strength laterally is directed to width of cloth material along width of cloth material.Therefore high-intensity air blowing is directed near the edge of width of cloth material, and more low intensive air blowing is directed to the center of width of cloth material.As mentioned above, consider the width of cloth material afterbody paper injection of success, width of cloth edge edge is most important position.Air blowing at the center than small intensity breaks away from drying cylinder with regard to sufficient to guarantee width of cloth material.Advantageously, air blowing is directed to the width of cloth material in the broad area, has been adjusted to just enough width of cloth material disengaging drying cylinders but blow.
In the 3rd embodiment, near width of cloth material end, adjust and blow.In this case, the each air blowing formed before width of cloth material arrives blow-out position, and closed through behind the blow-out position at width of cloth material.In this way, when the only part of these blow-out positions is only covered by dryer fabric, form air blowing, and correspondingly, when the only part of blow-out position is also covered by width of cloth material, form air blowing.Therefore blowing is not to form simultaneously at all blow-out positions.When not being when once forming air blowing for whole drying section, can be directed to high-intensity air blowing the point that needs high strength to blow.Therefore consider the afterbody paper injection of width of cloth material, can when blowing, have the blow-out position of most important significance to make air blowing intensity higher this.
In the 4th embodiment, width of cloth material dried content value at the first drying cylinder place during the afterbody paper injection is lower in the dried content value at the first drying cylinder place than operating period.When width of cloth material was moist, width of cloth material was attached to dryer fabric better.According to present embodiment, width of cloth material, fabric or they both can be by humidification during the afterbody paper injection.For example, fabric cleans sparge pipe and opened before width of cloth material arrives one group, so that width of cloth material is attached to fabric.Can be in the both sides of width of cloth material and fabric or only carry out humidification on the side.Advantageously, with the contact surface humidification of width of cloth material and fabric.When width of cloth material is moist and is attached to dryer fabric better, just enough width of cloth material has been transferred to dryer fabric from the surface of drying cylinder than the air blowing of small intensity near, promptly advance with dryer fabric.
In the 5th embodiment, the dried content value that arrives the width of cloth material at the first drying cylinder place during the afterbody paper injection is hanged down 5 units of percent than operating period approximately in the dried content value at the first drying cylinder place, even about 10 units of percent.The width of cloth material of low 5 units of percent of dried content can be transferred to drying section from press section.When the one or more at least press. nips unloadings of operation (on relief), realize this lower dry matter content.In addition, when hanging down 5 units of percent approximately, width of cloth material is obviously better to the higher dried content value of the attached ratio of dryer fabric when dried content (promptly doing content value).
In the 6th embodiment, before width of cloth material arrives vacuum tank, in vacuum tank, produce vacuum.Produce vacuum when in addition, the only part in these vacuum tanks is only covered by dryer fabric.Can there be different regions of no pressure on the open type surface of vacuum tank (open surface), and vacuum can be applied to vacuum tank, perhaps can be according to the injector principle by blowing or combination aforesaid way and make the vacuum tank decompression.When the top of vacuum tank only dryer fabric occurred, vacuum leak was very big.In other words, via dryer fabric tangible air having taken place flows.When the only part decompression of this vacuum tank that is only covered by dryer fabric, vacuum leak obviously reduces.When carrying out the afterbody paper injection for full-width web, it is useful increasing vacuum, but when carrying out the afterbody paper injection for the paper tail, high vacuum can be torn into broken with width of cloth material head, and broken is advanced with the paper tail.When the width of cloth material head that becomes broken was advanced with the paper tail, this may cause interrupting very much.When width of cloth material and fabric covering vacuum case, significantly loss no longer takes place, and needn't close vacuum.Therefore under the situation of width of cloth material covering vacuum case, keep vacuum, avoid the interruption or the breakage of width of cloth material of width of cloth material thus.
Description of drawings
Describe the present invention in detail below with reference to the accompanying drawing that one of embodiments of the invention are shown, wherein:
Fig. 1 is the side view of fiber web machine;
Fig. 2 illustrates observe from the end of slewing rollers related with drying cylinder according to device of the present invention;
Fig. 3 a illustrates observe from the side of drying cylinder related with drying cylinder according to device of the present invention;
Fig. 3 b illustrates observe from the side of drying cylinder related with drying cylinder according to device of the present invention;
Fig. 4 illustrates two continuous cylinder group that are equipped with according to device of the present invention; And
Fig. 5 illustrates the sequential chart according to air blowing of the present invention.
The specific embodiment
Fig. 1 illustrates a kind of traditional fibre width of cloth material machine 18 of observing from the side.Fiber web machine 18 comprises (as continuous local entities) forming section 10, press section 12, drying section 14 and finishing section 16.In the fiber web machine according to Fig. 1, finishing section includes only machine rolls.Method and apparatus of the present invention only is designed to use the afterbody paper injection in the drying section 14 of fiber web machine 18 of single fabric operation 20 of going up location (above-located).Drying section 14 comprises continuous cylinder group 38, and 9 cylinder group 38 are arranged in the fiber web machine according to Fig. 1.Cylinder group 38 usefulness symbol R1-R9 come discriminate individuals.Advantageously, width of cloth material is overall with during the afterbody paper injection.
In the afterbody paper injection of the width of cloth material 34 in drying section 14, fiber web machine 18 shown in Figure 1 can have shown in Figure 2 according to device 28 of the present invention.Drying section 14 shown in Figure 1 comprises continuous cylinder group 38, and cylinder group 38 comprises drying cylinder 22, slewing rollers 24 and a dryer fabric 26 as shown in Figure 2.Dryer fabric 26 only is fit to advance via drying cylinder 22 and slewing rollers 24 as single fabrics operation 20 of last location.During the afterbody paper injection of width of cloth material 34, the end 42 of width of cloth material 34 is fit to take out through drying section 14 with overall with.In addition, in these edges of width of cloth material, on a side in the open type gap 32 that is formed by drying cylinder 22 and dryer fabric 26, include the air blowing equipment that spurts (blow off blowequipment) 80 at least, it is used to make full-width web 34 to break away from drying cylinder 22.
Fig. 3 a and Fig. 3 b illustrate related with drying cylinder 22 according to device 28 of the present invention from the unilateral observation of drying cylinder 22.Spurt near the edge 33,35 that air blowing equipment 80 is positioned at width of cloth material 34.In the time of near spurting the edge 33,35 that air blowing equipment 80 is positioned at width of cloth material 34, can make the edge 33,35 of width of cloth material 34 break away from drying cylinders 22, and width of cloth material 34 is shifted advance to follow dryer fabric 26.
In according to the device of the present invention shown in Fig. 3 a and Fig. 3 b, spurt air blowing equipment 80 and comprise that full width stream send device (flow profile) 82, full width stream send device 82 to be fit to allow bigger air-flow 84 to arrive the edge 33,35 of width of cloth material 34.Spurt air blowing equipment 80 and comprise a gas blow pipe 86 or several gas blow pipe that separates 86.Full width stream in the gas blow pipe 86 send device 82 to be opening 88.Opening or hole/gap are positioned on the sidewall of pipe.Also can be provided with less pipe, the nozzle that is attached to gas blow pipe with opening relatedly.The outlet of this nozzle can form by equating (flattening).In these openings, the hole is of a size of 2mm-10mm, advantageously is 3mm-8mm.The distribution of the opening in the width of cloth edge edge zone is worth in other words, and the distance between the opening is 50mm-300mm." width of cloth edge edge zone " refer to apart from width of cloth edge edge 0.2m-1m here, advantageously be the zone of 0.3m-0.6m.In following scope, the distribution value of opening is 150mm-1500mm, advantageously is 400mm-1000mm.
In Fig. 3 a, gas blow pipe 86 separates, and they are positioned near the edge 33,35 of width of cloth material 34.When using above-mentioned openings/apertures, in the distribution of width of cloth material edge than having the distribution of a distance closeer apart from width of cloth edge edge.In Fig. 3 b, opening 88 is directed pipe 89 and surrounds, and these oriented tube 89 can be positioned at the position in more close drying cylinder/open type gap.Therefore blowing can be by very well directed.
In Fig. 3 b, a gas blow pipe 86 has been contained the whole width of width of cloth material, and gas blow pipe 86 is positioned near the edge 33,35 of width of cloth material 34.It is that center full width stream send device 83 that the full width stream that is positioned at the center of gas blow pipe 86 send device 82.The central part that center full width stream send device to guarantee width of cloth material and width of cloth material is transferred near the dryer fabric.In turn, it is that edge full width stream send device 81 that the full width stream that is positioned at width of cloth material edge in width of cloth material gas blow pipe send device 82, and it transfers near the dryer fabric extremely important to width of cloth material from drying cylinder.The most simply, respectively there is an edge full width stream to send device at two edges, and has 1-10 center full width stream to send device at the center of gas blow pipe.
Shown in Fig. 3 b, at least one disconnected paper air blowing equipment 85 is positioned at outside the edge 33,35 of width of cloth material 34.Air from every disconnected paper air blowing equipment 85 with respect to fiber web machine to small part along the surface under the edge that is positioned at width of cloth material 34 33,35 that laterally blows to drying cylinder 22.When disconnected paper is blown with respect to fiber web machine when laterally entering between width of cloth material and the drying cylinder, spurting subsequently blown or paper injection/guiding is blown can make width of cloth material disengaging drying cylinder.Disconnected paper air blowing equipment 85 is by disconnected paper purge valve 87 controls.In turn, spurt air blowing equipment 80 by spurting purge valve 91 controls.Disconnected paper purge valve all is automatically controlled with spurting purge valve 91.Disconnected paper blow-out nozzle is adjustable with spurting blow-out nozzle along machine direction and horizontal orientation.In addition, gas blow pipe self can be with respect to drying cylinder/location, open type gap.
Blow and also can be located at independently in the pipe in the edge, in this case, the air blowing of central part can be located in the full duration pipe (full width pipe) of himself.As long as corresponding maintenance surface area and media flow, the shape of nozzle bore just can be different with gauge orifice.In addition, can use the short hole nozzle (short orifice nozzle) that respective flow is provided.Opening/the nozzle of edge for example can be the high Laval nozzle of efficient (laval nozzle).Can be from two edges or only take medium to air blowing equipment from an edge.
Though air blowing equipment in edge typically has been enough to make width of cloth material to break away from drying cylinder and width of cloth material is transferred near the dryer fabric, but gas blow pipe advantageously extends the part more than 30% that is used for width of cloth material width, is advantageously used in the part more than 50% of width of cloth material width most.When most width of cloth material width like this was contained in air blowing, width of cloth material was than near transferring to dryer fabric from drying cylinder more reliably in the past.
Advantageously, use the fiber web machine of overall with afterbody paper injection to have more than the 4m, advantageously be the above width of 6m.In wide fiber web machine, cut distance along the diagonal angle longitudinally of horizontal while of width of cloth material very long.When cutoff length was long, the possibility of generation problem increased in cutting.In addition, during overall with afterbody paper injection, compare when in the afterbody paper injection, using the paper tail, transport still less broken to pulper.When using overall with afterbody paper injection, compare during with use paper tail, also the production that can fiber web machine be carried out is faster.Except that increasing machine-wide, also to emphasize these advantages.Generally speaking, we can say when finishing the afterbody paper injection, avoided the problem that forms the paper tail and in afterbody guides and widens, occur with full-width web.
Fig. 3 b show from the unilateral observation of drying cylinder 22 to related with drying cylinder 22 according to device 28 of the present invention.Spurt air blowing equipment 80 and contain whole width of width of cloth material 34.Therefore width of cloth material transfers to from drying cylinder 22 that to advance with dryer fabric 26 be reliable.In order to make the air consumption optimization, opening/nozzle relatively sparsely is provided with on the central part of containing width of cloth material of air blowing equipment that part of.Advantageously, measure the position of width of cloth material and adjust air blowing, make only in an air blowing group, to open and blow based on measured value.At blow-out position, width of cloth material is blown away from drying cylinder in the open type gap between drying section and drying cylinder.
During the afterbody paper injection, lower in the dried content value of the width of cloth material at the first drying cylinder place than common, for example, be low to moderate 40% dried content value rather than common 45% dried content value approximately.Thereby during the afterbody paper injection of width of cloth material, during the press. nips unloading, when promptly in drying section the afterbody paper injection taking place, the operation of machine is unexpected.
Fig. 4 illustrates and is equipped with according to two of device 28 of the present invention continuous cylinder group 38.Drying section comprises continuous cylinder group.Cylinder group 38 comprises drying cylinder 22, slewing rollers 24 and a dryer fabric 26, and this dryer fabric is fit to only advance via drying cylinder 22 and slewing rollers 24 as single fabric operation of last location.During the afterbody paper injection of width of cloth material, the end 42 of width of cloth material 34 is fit to be conducted through the drying section of being made up of cylinder group 38 with overall with.On a side in the open type gap 32 of drying cylinder 22, be included at least two edges and make full-width web 34 break away from the air blowing equipment 60 of drying cylinders.
In Fig. 4, device 28 comprises control system 36, and control system 36 is used for once forming the only air blowing of a part of air blowing equipment 60.In other words, near the air blowing that produces drying cylinder is that the position according to width of cloth material forms.Flow and to be directed to those part air blowing equipment in the open type gap that is arranged in the current group that width of cloth material arranged exactly.Therefore compressed-air actuated consumption keeps appropriateness, and can finish the afterbody paper injection with full-width web.
In device shown in Figure 4 28, once form the air blowing of the air blowing equipment group that comprises 1-8 (advantageously being 3-6) blow-out position.In Fig. 4, the drying cylinder number that the blow-out position that comprises in the air blowing equipment group quantitatively equals cylinder group and comprised.Air blowing equipment group is to adjust the least unit of air blowing.The air blowing equipment in an air blowing equipment group or the quantity of drying cylinder are 1-8, and when advantageously being 1-6, the consumption of air can be minimized.
The control system 36 of device 28 shown in Figure 4 comprises sensor 52, control appliance 54 and is used for the adjustment equipment 92 of each air blowing equipment group 90.Pressure pipe 96 is drawn from pressure manifold 94, is used to produce the air blowing of air blowing equipment 60.Sensor 52 is determined the position of width of cloth material 34.Sensor provides about advance the forward real time information of position of width of cloth material.Can realize the overvoltage of the equipment of blowing by calculating width of cloth material position.Longer in the time that a position stops as the fruit bat material, it is invalid then to calculate.In addition, this error accumulation therefore for accurately control air blowing, is necessary to determine the physical location of width of cloth material.Therefore sensor is controlled one group delay by calculating, and on the contrary when closing when blowing, and postpones the group of control its oneself.By being positioned at the sensor before the last drying cylinder, even can directly control group subsequently.
Air blowing equipment 60 ' outflow compressed air from the startup that is shown in broken lines.In turn, " do not flow out compressed air from the air blowing equipment 60 of closing.Therefore air-flow from air blowing equipment is directed to the current group that width of cloth material is arranged.Width of cloth material is through behind the sensor 52, and air blowing can be shifted forward along machine direction.One side in the open type gap of width of cloth material between drying cylinder and dryer fabric breaks away from drying cylinder.The length of air blowing equipment perhaps along the horizontal measured value of fiber web machine, is one at least at two edges and spurts nozzle.More accurately, each drying cylinder has at least one to spurt air blowing in two edges of width of cloth material, or spurts nozzle.For each cylinder group, have disconnected paper air blowing equipment or disconnected paper nozzle at least at two edges of width of cloth material.Spurting blows or spurt nozzle also is added to central area acceleration afterbody paper injection, and this almost is inevitable in quick machine.Air blowing equipment can form continuous air blowing or separate and blow.Advantageously, near two edges of width of cloth material, air blowing equipment is arranged, can save the air blowing volume in this case.When blowing near two edges at width of cloth material, width of cloth edge edge breaks away from drying cylinder; In case width of cloth edge edge breaks away from, then whole width of cloth material also breaks away from.The most advantageously, the width of air blowing equipment is substantially equal to the width of drying cylinder, and the length of the equipment of promptly blowing equals the width of width of cloth material, and whole width of cloth material width is contained in air blowing.When whole width of cloth material width was contained in air blowing, width of cloth material can break away from drying cylinder reliably, and shifted and advance with dryer fabric.
Fig. 4 illustrates the device 28 of the afterbody paper injection of the width of cloth material 34 in the drying section 14 of fiber web machine 18 (Fig. 1).Device 28 comprises the continuous cylinder group 38 that is used for dry width of cloth material 34.Cylinder group 38 comprises drying cylinder 22, slewing rollers 24 and a dryer fabric 26.Dryer fabric 26 is suitable as single fabric operation and advances via drying cylinder 22 and slewing rollers 24.Slewing rollers have the open type surface, this open type surface be illustrated in the dotted line 30 on expression open type surface slewing rollers 24 surface 44 near.Vacuum tank 62 is set to related with each slewing rollers 24, and produces vacuum before width of cloth material 34 arrives vacuum tank 62 in described vacuum tank.Device 28 comprises control system 36 again, and control system 36 is used for producing vacuum when the only part of vacuum tank 63 is only covered by dryer fabric 26.Or rather, first cylinder group 38 ' in the last vacuum tank 63 that only covers ' be depressurized by above-mentioned fabrics.Second cylinder group 38 " in the included vacuum tank 63 that only covers by above-mentioned fabrics be not depressurized.The vacuum tank 61 that is covered by width of cloth material 34 is depressurized.Be used for guiding the vacuum tank of full-width web to use vacuum at needs, strengthen overall with afterbody paper injection.In other words, utilize vacuum control, can make overall with afterbody paper injection play a role more reliably than in the past obvious.Advantageously, measure the position of width of cloth material, promptly determine the position of width of cloth material end.When the position of known width of cloth material, can select vacuum tank and/or the air blowing that to reduce pressure according to the width of cloth material situation of advancing of reality.In principle, also can select vacuum in its vicinity vacuum tank by the calculating means.The most advantageously for usually using and the synchronous computational methods of situation about measuring (being the physical location of width of cloth material).Vacuum tank in a plurality of vacuum tank groups can be reduced pressure.Because fiber web machine is very long, and disconnected paper can occur in the process of afterbody paper injection, makes that the decompression of vacuum tank is more accurate so measure the position of width of cloth material.
The vacuum that exists in the vacuum tank of related use with slewing rollers is air-breathing by dryer fabric.Also appear at as the fruit bat material near the dryer fabric of related use with vacuum tank, vacuum just is adsorbed to width of cloth material with dryer fabric and contacts, and also sucks micro-air by width of cloth material.The air capacity of passing width of cloth material is very little, and is in fact insignificant.In addition, when width of cloth material is in vacuum tank and slewing rollers place, produce air-flow near the edge of width of cloth material.The air capacity that penetrates width of cloth material and dryer fabric is significantly less than the air capacity of impingement drying portion fabric.Compare when all vacuum tank generates vacuum simultaneously, when the vacuum tank that is only covered by dryer fabric that has only part generates vacuum, can in vacuum tank, generate desired vacuum level with less vacuum requirement.When only being covered by dryer fabric, uses by the vacuum tank that has only part vacuum, the location application vacuum that can need most.During the afterbody paper injection, in the vacuum tank that width of cloth material or related with it width of cloth material end are arranged, need vacuum.In addition, only at the vacuum tank place that covers by dryer fabric tangible vacuum leak appears.
In device shown in Figure 4 28, the vacuum tank group 60 (vacuum tank group 60 comprises the quantity vacuum tank corresponding with the quantity of slewing rollers 24 62) that is arranged in cylinder group 38 generates vacuum simultaneously.Also can use different therewith distribution modes.The vacuum tank group is to adjust the least unit of vacuum.When the quantity of the vacuum tank that is only covered by dryer fabric minimizes, can make that also vacuum leak minimizes.
As shown in Figure 4, device 28 comprises control system 36, and control system 36 is used for controlling the vacuum tank 63 that is covered by dryer fabric, and which vacuum tank 63 is depressurized.Adjust the most accurately that yes and when the vacuum tank group includes only a vacuum tank, realize.Each vacuum tank group must reduce pressure at different time.Therefore, control system 36 should comprise the specific vacuum adjustment equipment 48 that is used for each vacuum tank group 50.
The control system 36 of device 28 shown in Figure 4 comprises sensor 52, control appliance 54 and is used for the adjustment equipment 48 of each vacuum tank group 50.Sensor 52 is determined the position of width of cloth material 34 in cylinder group 38.Sensor provides the real time information of the position of advancing forward about width of cloth material.The decompression of vacuum tank can be finished by calculating width of cloth material position.The time that rests on a position as the fruit bat material is longer, and it is invalid then to calculate.Therefore in addition, this error accumulation for for the purpose of the vacuum control accurately, must be determined the physical location of width of cloth material.Advantageously, each cylinder group is provided with a sensor, allows to receive the information that shifts about width of cloth material with this between cylinder group.
Sensor can be made up of extremely different parts.Sensor can be the pressure sensor that for example condition in the drying section is had good resistance.At sensor is under the situation of pressure sensor, realizes the sufficient degree of accuracy by dryer fabric easily.Sensor also can be optical pickocff or range sensor, for example ultrasonic sensor.This noncontacting proximity sensor can be for instance even is installed on the scraper equipment in the frame structure of fiber web machine, perhaps the side of cylinder group.When sensor is installed in the frame structure, sensor even also use easily during operation.
As shown in Figure 4, adjustment equipment 48 comprises electrically-controlled valve.Control appliance 54 will send to adjustment equipment 48 about the order of the position of an adjustment equipment 48, send to electrically operated valve or rather.Vacuum piping 58 is drawn from vacuum manifold 66, in order to generate vacuum in vacuum tank 62.Vacuum piping 58 includes adjustment equipment 48, and adjustment equipment 48 is used to adjust the decompression of vacuum tank.Therefore, by using electromagnetic valve, once control the vacuum of a vacuum group.More accurately, vacuum piping 58 is directed to the vacuum tank with region of no pressure.In the present embodiment, vacuum is introduced in the vacuum tank.
Device shown in Figure 4 comprises the scraper 64 that is used to clean drying cylinder 22.Advantageously, scraper 64 is to remove scraper (knock off doctor) 68, promptly installs 28 and advantageously comprises removing scraper 68.Remove scraper and be dimensioned to, support the operation of the broke treatment of full-width web at relevant position.If the air blowing equipment that makes width of cloth material break away from drying cylinder is only contained a part of width of cloth material width, then strengthened the advantage of removing scraper.When air blowing equipment was only contained a part of width of cloth material width, width of cloth material may unexpectedly contact scraper.If scraper is for removing scraper, then it can bear the stress that the contact of width of cloth material causes.
Remove scraper and should prevent that the width of cloth material from twining around drying cylinder.The cleaning doctor of standard (cleaning doctor) is only carved the winding that prevents width of cloth material in short-term.Removing scraper should go back the long period and prevent that the width of cloth material from twining around drying cylinder.Removing scraper should be that flexible pipe loads, and can be the DST scraper, and it for example allows to apply high linear load during the afterbody paper injection.
Behind the afterbody paper injection, reduce the linear load of scraper.Remove scraper and therefore be used as cleaning doctor during operation.When reducing linear load behind the afterbody paper injection, the energy consumption of drive unit significantly reduces behind the afterbody paper injection.Also can imagine conventional scraper is used as removing scraper, must have the abundance that is associated with scraper to blow but then, enter scraper to avoid width of cloth material, and further avoid width of cloth material to twine around drying cylinder.
Fig. 4 illustrates two continuous cylinder group 38, the dryer fabric 26 that each cylinder group 38 has drying cylinder 22, slewing rollers 24 and is fit to advance via drying cylinder 22 and slewing rollers 24.In different cylinder group is used the size of drying cylinder and slewing rollers, quantity and mutually the value of setting can change, but the running gear of related use with them is single fabric running gear of last location.With vacuum tank that slewing rollers are located relatedly in produce vacuum.
As shown in Figure 4, device 28 comprises control system 36, and wherein the disconnected paper checkout equipment 53 of width of cloth material is connected to control system 36.Spurt air blowing equipment 80 and also be connected to control system, be used to make full-width web 34 to break away from drying cylinder 22.Under the situation of the disconnected paper of width of cloth material, promptly can detect the disconnected paper of width of cloth material, and begin to blow to pick up new width of cloth material in disconnected paper position.The cylinder group that disconnected paper takes place can be made a general reference in disconnected paper position (restarting at this position afterbody paper injection).The afterbody paper injection of width of cloth material becomes easier, because needn't make width of cloth material again by whole drying section.The disconnected paper checkout equipment of width of cloth material is made up of the disconnected paper element of width of cloth material.Advantageously, the disconnected paper checkout equipment of described width of cloth material (being the disconnected paper element of width of cloth material or rather) also is used for regularly blowing and is air-breathing.
Fig. 5 illustrates the sequential chart of blowing according to the afterbody paper injection of full-width web of the present invention.The formation of the air blowing of horizontal line inflatable 71 each air blowing group PR1-PR9 of expression.The starting point 73 of line inflatable 71 is illustrated in particular moment t and begins to blow.Starting point 74 is width of cloth material is directed to drying section from press section time points.Finishing a little 76 is time points that width of cloth material has successfully been picked up whole drying section.Starting point 74 and to finish some the inclined dashed line between 76 be the afterbody paper injection line 78 that advance of expression width of cloth material in drying section.When afterbody paper yarn 78 intersects with line inflatable 71, width of cloth material has successfully been picked up relevant air blowing group.Only the air blowing group at current place, width of cloth material end of advancing produces and blows.The overvoltage simultaneously of therefore not every air blowing group.Be directed to correct position so blow, and the highest in the some intensity of needs.In starting point 74, only produce and blow at the first air blowing group PR1.Though because have only the first air blowing group PR1 to remove overvoltage along with air blowing, so the output quantity of blowing is limited, the flow strength that is associated with this air blowing group is very high.
Fig. 5 illustrates the calculating based on the speed of service, and each air blowing group PR1-PR9 is overvoltage a little before width of cloth material arrives air blowing group relevant among the PR1-PR9 how.In case width of cloth material has successfully been picked up whole air blowing group, has promptly stopped at this air blowing group and blow with small delay.Like this, air blowing group needn't be followed the restriction of drying cylinder by any way.
The timing of air blowing group can be applicable to vacuum tank, and difference is that the latter does not close after width of cloth material is through relevant group.Slewing rollers are always opened, unless control decompression according to purposes via vacuum tank.Owing to remove via all suction boxs because of vacuum, and vacuum output is limited, so very little flowing of each suction box.Mobile ratio by having only machine clothing is higher by the flow strength of machine clothing and width of cloth material.Therefore when width of cloth material successfully being picked up relevant vacuum tank group, flow and reduce.
Claims (15)
1. the method for the afterbody paper injection of width of cloth material in the drying section of fiber web machine, described fiber web machine comprises three continuous cylinder group (38), and described cylinder group (38) comprising:
Drying cylinder (22);
Slewing rollers (24);
Vacuum tank (62);
A dryer fabric (26) is advanced via described drying cylinder (22) and described slewing rollers (24) as single fabric operation (20); And
In the afterbody paper injection of described width of cloth material (34), the end (42) of described width of cloth material (34) is conducted through described drying section (14) with overall with;
It is characterized in that, on a side in the open type gap (32) that forms by drying cylinder (22) and described dryer fabric (26), locate at the edge (33,35) of described width of cloth material (34) at least, blow away the described width of cloth material (34) of overall with from described drying cylinder (22).
2. method according to claim 1 is characterized in that air blowing is directed to the center of described width of cloth material (34).
3. method according to claim 1 and 2, it is characterized in that blowing laterally is directed to described width of cloth material (34) with varying strength along described width of cloth material.
4. according to each described method among the claim 1-3, it is characterized in that during the afterbody paper injection, the dried content value that described width of cloth material (34) is located at first drying cylinder (22) is less than the dried content value of operating period.
5. method according to claim 4 is characterized in that, during the afterbody paper injection, the dried content value that described width of cloth material (34) is located at described first drying cylinder (22) is than approximately little 5 units of percent of dried content value of operating period.
6. according to each described method among the claim 1-5, wherein arrive described vacuum tank (62) and in each vacuum tank (62), produce vacuum before at described width of cloth material (34), it is characterized in that, when only a part of vacuum tank (63) is only covered by described dryer fabric (26), produce vacuum.
7. according to each described method among the claim 1-6, it is characterized in that, detect the disconnected paper of width of cloth material, and the air blowing that begins to be used to pick up described width of cloth material once more from disconnected paper point.
8. according to each described method among the claim 1-7, it is characterized in that, comprise 1-8 drying cylinder (22) in air blowing group (90), when advantageously being 3-6 drying cylinder (22), forming and blow.
9. the device of the afterbody paper injection of width of cloth material in the drying section of fiber web machine, described fiber web machine comprises three continuous cylinder group (38), and described cylinder group (38) comprising:
Drying cylinder (22);
Slewing rollers (24);
Vacuum tank (62);
A dryer fabric (26) is suitable as single fabric operation (20) and advances via described drying cylinder (22) and described slewing rollers (24); And
In the afterbody paper injection of described width of cloth material (34), the end (42) of described width of cloth material (34) is fit to overall with by described drying section (14);
It is characterized in that, on a side in the open type gap (32) that forms by drying cylinder (22) and described dryer fabric (26), comprise the air blowing equipment (80) that spurts; Describedly spurt the edge (33,35) that air blowing equipment (80) is positioned at described at least width of cloth material (34) and locate, be used to make the described width of cloth material (34) of overall with to break away from described drying cylinder (22).
10. device according to claim 9 is characterized in that, includes center full width stream at the center of described width of cloth material (34) and send device (83).
11., it is characterized in that the described described full width stream that spurts in the air blowing equipment (80) send device (82) to be fit to allow to produce bigger flowing at the described edge (33,35) of described width of cloth material (34) according to claim 9 or 10 described devices.
12. according to each described device among the claim 9-11, it is characterized in that, described device (28) comprises control system (36), and described control system (36) is used for producing vacuum when the only part of described vacuum tank (63) is only covered by described dryer fabric (26).
13., it is characterized in that described device (28) comprises removes scraper (68) according to each described device among the claim 9-12.
14. according to each described device among the claim 9-13, it is characterized in that, described device (28) comprises control system (36), described control system (36) has the disconnected paper checkout equipment (53) of width of cloth material and is connected to the air blowing equipment that spurts (80) of the disconnected paper checkout equipment (53) of described width of cloth material, and the described air blowing equipment (80) that spurts is used to make the described width of cloth material (34) of overall with to break away from drying cylinder (22).
15. device according to claim 14 is characterized in that, the disconnected paper checkout equipment (53) of described width of cloth material also is suitable for being spurted the air blowing that air blowing equipment (80) forms and carried out timing by described.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI20085486 | 2008-05-22 | ||
| FI20085486A FI20085486L (en) | 2008-05-22 | 2008-05-22 | Method and arrangement in the end feed of the web with the drying part of the fiber web machine |
| PCT/FI2009/050426 WO2009141508A1 (en) | 2008-05-22 | 2009-05-22 | Method and arrangement in tail threading of a web in the dryer section of a fiber web machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102089474A true CN102089474A (en) | 2011-06-08 |
| CN102089474B CN102089474B (en) | 2013-02-13 |
Family
ID=39523137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200980127308.XA Expired - Fee Related CN102089474B (en) | 2008-05-22 | 2009-05-22 | Method and arrangement in tail threading of a web in the dryer section of a fiber web machine |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2300663A4 (en) |
| CN (1) | CN102089474B (en) |
| FI (1) | FI20085486L (en) |
| WO (1) | WO2009141508A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102817270A (en) * | 2012-08-24 | 2012-12-12 | 玖龙纸业（太仓）有限公司 | Automatic paper breakage and cylinder blockage prevention device for drying part of paper making machine |
| CN106120425A (en) * | 2016-08-08 | 2016-11-16 | 无锡裕力机械有限公司 | The wireless paper-carrying system of paper machine |
| CN106868921A (en) * | 2017-01-11 | 2017-06-20 | 无锡山富机械有限公司 | Drying section of paper machine paper web stripping off device and its calibration method |
| CN107002368A (en) * | 2014-12-11 | 2017-08-01 | 佐治亚-太平洋消费产品有限合伙公司 | Bath is sprawled and stably blown to effective web |
| CN110396859A (en) * | 2019-06-05 | 2019-11-01 | 湖北长江汇丰纸业有限公司 | A kind of blowing paper injection device producing speciality paper |
| CN110791994A (en) * | 2019-11-19 | 2020-02-14 | 湖北中烟工业有限责任公司 | Automatic paper winding preventing device for paper machine return roller |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI123016B (en) | 2011-02-17 | 2012-10-15 | Metso Paper Inc | Method and arrangement for threading a full-width web with a dryer section of a fiber web machine |
| DE102011087094A1 (en) * | 2011-11-25 | 2013-05-29 | Voith Patent Gmbh | Method for transferring a material web from a drying arrangement to a downstream functional unit and drying device |
| CN115679745A (en) * | 2022-09-30 | 2023-02-03 | 玖龙纸业(天津)有限公司 | Device for improving dryness of paper web |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI93038C (en) * | 1993-09-21 | 1995-02-10 | Valmet Paper Machinery Inc | Procedure and plant for controlling the tip drawing tape in a paper machine |
| DE19548303B4 (en) * | 1995-12-22 | 2006-08-31 | Voith Paper Patent Gmbh | drying section |
| US5881471A (en) | 1996-09-09 | 1999-03-16 | Kaluza; Barbara K. | Method and apparatus for making window treatments including swags, valances and jabots |
| US5881472A (en) * | 1997-10-22 | 1999-03-16 | Beloit Technologies, Inc. | Ventilator apparatus for inhibiting flutter in a web dryer |
| DE10024296B4 (en) * | 2000-05-17 | 2008-11-20 | Voith Patent Gmbh | Machine for producing a material web |
| DE112004000672T5 (en) * | 2003-04-24 | 2006-03-09 | Metso Paper, Inc. | Scraper for a paper or board machine |
| FI122337B (en) * | 2005-08-25 | 2011-12-15 | Metso Paper Inc | Method and apparatus for tip drawing in the dryer section of a web forming machine |
-
2008
- 2008-05-22 FI FI20085486A patent/FI20085486L/en not_active IP Right Cessation
-
2009
- 2009-05-22 CN CN200980127308.XA patent/CN102089474B/en not_active Expired - Fee Related
- 2009-05-22 EP EP09749992.5A patent/EP2300663A4/en not_active Withdrawn
- 2009-05-22 WO PCT/FI2009/050426 patent/WO2009141508A1/en active Application Filing
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102817270A (en) * | 2012-08-24 | 2012-12-12 | 玖龙纸业（太仓）有限公司 | Automatic paper breakage and cylinder blockage prevention device for drying part of paper making machine |
| CN107002368A (en) * | 2014-12-11 | 2017-08-01 | 佐治亚-太平洋消费产品有限合伙公司 | Bath is sprawled and stably blown to effective web |
| CN106120425A (en) * | 2016-08-08 | 2016-11-16 | 无锡裕力机械有限公司 | The wireless paper-carrying system of paper machine |
| CN106868921A (en) * | 2017-01-11 | 2017-06-20 | 无锡山富机械有限公司 | Drying section of paper machine paper web stripping off device and its calibration method |
| CN106868921B (en) * | 2017-01-11 | 2019-07-19 | 无锡山富机械有限公司 | Drying section of paper machine paper web stripping off device and its calibration method |
| CN110396859A (en) * | 2019-06-05 | 2019-11-01 | 湖北长江汇丰纸业有限公司 | A kind of blowing paper injection device producing speciality paper |
| CN110396859B (en) * | 2019-06-05 | 2020-11-03 | 湖北长江汇丰纸业有限公司 | Blowing paper-leading device for producing special paper |
| CN110791994A (en) * | 2019-11-19 | 2020-02-14 | 湖北中烟工业有限责任公司 | Automatic paper winding preventing device for paper machine return roller |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2009141508A1 (en) | 2009-11-26 |
| CN102089474B (en) | 2013-02-13 |
| FI20085486A0 (en) | 2008-05-22 |
| EP2300663A4 (en) | 2014-01-22 |
| FI20085486L (en) | 2009-11-23 |
| EP2300663A1 (en) | 2011-03-30 |
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