CN1101499C - Method for control of curl of paper in dryer section of paper machine and paper or board machine - Google Patents
Method for control of curl of paper in dryer section of paper machine and paper or board machine Download PDFInfo
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- CN1101499C CN1101499C CN98803774A CN98803774A CN1101499C CN 1101499 C CN1101499 C CN 1101499C CN 98803774 A CN98803774 A CN 98803774A CN 98803774 A CN98803774 A CN 98803774A CN 1101499 C CN1101499 C CN 1101499C
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- cylinder
- paper web
- drying
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
- D21F5/08—Arrangement of steam points in the cylinders
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
- D21F5/04—Drying on cylinders on two or more drying cylinders
Abstract
The invention concerns a method in the dryer section of a paper or board machine for control of the curl of paper, in which method steam treatment and/or moistening of the paper web (W) is/are employed. In the method, the operations carried out in view of controlling the curl of the paper web (W) are carried out in a number of stages and/or when the web (W) temperature is lower than 85 DEG C, preferably lower than 75 DEG C, and/or when the dry solids content of the web (W) is in the range of K1...K2, wherein K1 = ultimate dry solids content - 7 % and K2 = ultimate dry solids content + 3 %. Further, the invention concerns a paper or board machine, which comprises at least a headbox, a former, a press, and a dryer section, in which steam boxes or moistening devices are employed for control of the curl. There are at least two of said curl regulation devices in view of achieving a regulation of the curl in a number of stages, and/or said curl regulation devices have been fitted to operate in an area in which the web temperature is lower than 85 DEG C, preferably lower than 75 DEG C, and/or the dry solids content of the web is in a range of K1...K2, wherein K1 = ultimate dry solids content - 7 % and K2 = ultimate dry solids content + 3 %.
Description
The present invention relates to the method for curling of the paper in a kind of drying section of controlling paper machine or board machine, in the method, adopted the steam treatment of paper web and/or wetting.
The invention still further relates to a paper machine or board machine, it comprises at least one flow box, a building mortion, and a squeezer and a drying section have wherein used steam chest or damping device, are used to control curling of paper web.
In the prior art, what generally adopt is the multi-cylinder drying cylinder of paper machine, and two nets tractions and/or single net draw.In two net tractions, cylinder group has two nets, and another pushes paper web from the below at the heating cylinder surfaces from the top for one of them.Between each row of drying cylinder, these are listed as level normally, paper web is freely, do not have traction, are easy to produce vibration, and this can cause the damage of paper web, when still wet thereby intensity is lower when paper web, occur this situation especially especially easily.Here it is, and why said in recent years single use of netting traction increases gradually, in single net traction, each group drying cylinder has only a dry net, the paper web of its upper support is by whole cylinder group, so that dry net is squeezed in the paper web on the drying cylinder on the surface of heating cylinder, and on the reverse cylinder or roller between the drying cylinder, paper web remains bandy that side.Therefore, in single net traction, drying cylinder is arranged on the outside in net loop, and reverse cylinder or roller are arranged on the inboard in this loop.
Rule of thumb, if paper web by the single face drying, then curling just easily appears in paper.When the conventional cylinder group of utilizing single net traction during from its basal surface one side dry paper, the whole length of drying section before if so asymmetric drying extends to, then the drying effect that is produced is that the basal surface side of at first paper web is dried, when drying was proceeded, drying effect also extended to the top surface side of paper web.At this moment, the paper web that is dried generally curls, and sees it is spill from above.
As can be known, the trend that paper web occur to curl is relevant with the paper web formation stage from prior art, particularly with page (sheet) formation stage (applicant's Sym-Former for example
TM) the weir plate nozzle and the selection of the friction speed between the papermaking wire-cloth, the selection of the building mortion and the method for operation thereof is relevant with other operational factor.In the prior art,, utilize the asymmetric drying in the drying cylinder of rear portion, can regulate the initial crimp form of paper, so that can optimize the curling of paper after the single or double manifolding for example for carbon paper.For carbon paper, curling reactivity is that per unit changes the degree that appearance is curled under the wetting state, is a bigger scope in the multi-ply paper structure that produces in the paper web of wet end forms.
The drying section of nearest high speed paper machine of the prior art related to the present invention is single net traction in its most length range, and considers curling control trend, and symmetry is dry fully so that carry out on the Z direction also to have used a reverse group.Yet oppositely the open defect of group on the rentability of the investment of the overall efficiency of performability, paper machine and paper machine all reveals.Therefore, consider that drying section is supported fully and uses the routine group that does not have oppositely to organize of single net traction may be a best solution on its whole length from the maneuverability of paper machine.But those skilled in the art does not but have courage to introduce such solution in operation, can cause the uncontrollable of paper curling test and produce disadvantageous curling because think to do so always.The problem that prior art includes in the scheme of reverse cylinder group is how to remove the broken that produces in the paper web damage process, because reverse the have no basis automatically cleaning ability of gravity of group.
So, the purpose of this invention is to provide the drying section of a paper machine, wherein do not need reverse cylinder group, but all other the function that has that it provides.
Therefore, the objective of the invention is to address the above problem from a brand-new angle, and novel solution is provided, these solutions are opposite with conventional thoughtcast.
Prior art related to the present invention is referring to applicant's Finnish patent No.91900 (identical with U.S. Patent No. 5416980), the method that reduces the curling test of paper at the drying section of paper machine has wherein been described, in the method, paper web is by cylinder dried, utilize a dry net that paper web is pressed on its area of heating surface, in this drying section, what used cylinder group adopted is single net traction and/or the traction of two net.In the method, what once be considered to novel part is, the whole length of traversing paper web at drying section basically provides hot water and steam, utilizes this method, in the fiber mesh of paper web tension force that produce or that be tending towards producing just after the formation zone of these tension force by the heating and wetting the elimination.
A kind of rear portion drying cylinder that is used at the rear portion of paper machine drying cylinder desiccated surface processing paper web or analog and is used to implement the paper machine of this method has been described in applicant's Finnish patent application No.963734 (identical with interim U.S. Patent application No.60/030693), wherein in order to compensate the curling test of paper web, in the drying cylinder of rear portion, paper web utilizes in the drying group of conventional single net traction or a plurality of dry group one and is dried, and in drying or after the drying, utilize one or more devices to handle paper web, so that the curling test of compensation paper web, this device is, steam chest for example, one spraying device, a damping device and/or a soft press-polishing machine.
On the other hand, in the open No.98387 (No.08/705059 is identical with U.S. Patent application) of applicant's Finnish patent, described a kind ofly to paper, particularly fine paper carries out the surface-treated papermaking process and implements the drying section of a paper machine of this method.Be dried at preceding drying section by the paper web of press dewatering, wherein drying energy lower face side from paper web on the Z direction is applied on the paper web in the whole length of preceding drying section asymmetricly.This step utilizes continuous groups of single net traction to carry out by a plurality of, these continuous cylinder group in the support of dry net towards bottom-open.In this way, substantially can prevent to be easy to the contraction of the paper web that the increase at vertical and horizontal and drying solid thing content together occurs.Damage as for paper web, broken to the cylinder group of bottom-open by means of the effect of gravity on the broken transporter that drops under being arranged on.Owing to asymmetric anterior dry, the paper web with curling test enters the portion of finishing, and in this finished portion, paper web was carried out postorder and handles, and the while is wetted or carry out submissive processing, and then gets rid of curling of dryer section formation forwardly.At the rear portion drying cylinder, also can be to have the cylinder group of two net tractions and be used for controlling curling steam to regulate and steam chest infrared in addition (infra) and air borne drying.
In applicant's Finnish patent application No.964830 (No.60/032405 is identical with U.S. Provisional Patent Application), a kind of method of dry paper and the drying section of a paper machine have been described.Wherein the method for dry paper may further comprise the steps: drying section before the paper web that be dried enters from press section, at this drying section, paper web is adopting conventional single the net in the cylinder group of drawing from its basal surface side drying, drying section includes only the single net cylinder group that adopts conventional single net traction before described, and paper web the past drying section enters one and finishes portion, finish portion at this, with a coating/top sizing device paper web is coated with/top sizing, and at rear portion drying cylinder inner drying, in this rear portion drying cylinder, paper web is dried in a cylinder group that adopts single net to draw at least, after this, paper web in a calender by press polish and be sent to and batch the station, therein, paper web is rolled up to a reel, and in the method, the control utilization that paper web curls is at preceding drying section and/or finish parts in the portion and/or the combination of device and described parts realizes.In addition, drying section and was finished portion before the drying section of paper machine comprised one, and wherein the portion of finishing comprises a coating/top sizing device, a rear portion drying cylinder, and a calender and batches the station.The drying section of paper web is included in preceding drying section and/or finishes being used in the portion and control the parts that curl of paper web and/or the combination of device and described parts.The parts that control is curled comprise, especially, spurting of the humid air of heat by dry net in preceding drying section, the steam chest that in the drying cylinder of rear portion, uses, utilize the steam treatment of steam chest and the combination of a cooling cylinder, bottom support band or supporting network in the drying cylinder of rear portion, two net cylinder group of in the drying cylinder of rear portion, using, what link to each other with at least one cylinder in the drying cylinder of rear portion passes through spurting of net, the use of the drying cylinder natural scale that is fit to, the atomizing of water on paper web in the drying cylinder of rear portion, the infrared case of before calender, paper web being handled, drying cylinder is to the transmission of rear portion drying cylinder in the past for humid air, and quilt is spurted on paper web and utilizes the mechanical treatment of a spreader bar to paper web.
Also can be referring to the prior art described in the United States Patent (USP) 5557860, wherein said drying section comprises the cylinder group that adopts conventional single net traction, and damping device is installed after cylinder group, utilizes curling of this damping device control paper web.
The objective of the invention is to further develop above-mentioned prior art solution, so that more effectively control curling of paper web at the drying section of paper machine.
Another object of the present invention provides a drying section that has a paper machine of finishing device, and this device can the operation of high level ground.
In order to reach above-mentioned and following the object of the invention, the principal character of the inventive method is, in the method, operating in finishing device a plurality of steps before of paper web curl control carried out, the paper web of the solid contents scope K1 that finishing device is produced at paper web in the K2, and the temperature of paper web is lower than 85 ℃ at least in a step, be preferably lower than 75 ℃, the final drying solid thing of K1=content-7% wherein, the final drying solid thing of K2=content+3%.
Paper machine of the present invention or board machine are characterised in that, for being implemented in the curling adjusting of paper web in a plurality of steps, have at least two described curling adjusting devices, and curling the operating in finishing device a plurality of steps before of being carried out of control paper web carried out, the paper web of the solid contents scope K1 that finishing device is produced at paper web in the K2, and the temperature of paper web is lower than 85 ℃ at least in a step, be preferably lower than 75 ℃, the final drying solid thing of K1=content-7% wherein, the final drying solid thing of K2=content+3%.
According to the present invention, when the temperature of paper web is lower than 85 ℃, when being preferably lower than 75 ℃, the adjusting of curling.Be lower than 85 ℃ when temperature is low to moderate, when being preferably lower than 75 ℃ level, steam can more effectively condense in the paper web.Applicant of the present invention tests finished product machine.When the last last drying cylinder in the drying section be heat the time, a steam chest that directly is placed on behind this drying cylinder does not have too big effect to curling of paper web; When closing the steam that feeds to this drying cylinder, the temperature of paper web descends, and steam chest just can produce sizable effect.
The present invention carries out the adjusting that paper web curls in the rearmost end of dry run.That the applicant is also noted that is wetting when using/during steam treatment, undue drying can promote the control of curling.According to the present invention, to 3% the drying solid thing content range that is higher than this content, can obtain best controllability being lower than desirable final solid contents 7%.For the fine paper of top sizing, this scope is generally 88% to 98%.
And, according to the present invention, curl and regulate operation, as steam treatment/the wetting and cooling of paper web, in a plurality of steps, carry out, can obtain curling efficiently regulating effect.This can find out from accompanying drawing 3, result of the test wherein only show the paper web of single face drying curl terribly (20 units).Only the steam treatment in a step is curled with regard to having reduced basically, about 5 units but paper web still curls on original direction.When paper web before steam treatment, carried out slightly wetting, the direction of curling of paper web even can be reverse then.
One damping device is effectively on the temperature that reduces paper web.In some applications, can replace a cooling cylinder with a damping device.
In apparatus of the present invention, the drying section of paper machine preferably includes only the cylinder group of single net traction, wherein realizes the removal of broken constantly by the effect of gravity, does not therefore have what problem and occurs.Equally, in single net traction, paper web is supported constantly by a net, has improved its maneuverability, also can increase its speed.At the unequal-side of paper web, particularly dry and in the control of curling that produces by unequal-side, in the rear portion drying cylinder of the drying section of paper machine, provide the parts that are used for according to above-mentioned principle control curling test, so that obtain the desirable amount of crimp of paper web.
According to one embodiment of the invention, in the drying cylinder of rear portion, the control that is used to curl, drying cylinder can be cooled and/or can regulate its temperature, and the wetting or steam chest of use, they alternately are provided with, so that a multistage cooling/wetting curling circulation is provided, and combine in a kind of extremely favourable mode with a best roller/cylinder diameter.In prior-art devices, when the diameter of suction roll is big, utilize the optimization of cylinder/roller diameter ratio can play effect, increased evaporation by lower surface.A feature of the present invention is the selection of a cylinder/roller diameter ratio that is fit to, and when paper web centered on a larger-diameter suction roll or analog operation, the temperature of paper web had been lowered.After this, a steam chest for example is installed so that be provided for the wetting of adjusting of curling.
When the single net traction of a routine is provided in the preceding drying cylinder of drying section and rear portion drying cylinder, paper web is preferably also initially cooled off from the bottom surface, just, in paper web, produce a thermograde on the principle, be lower than its opposite face for use in the temperature of that wetted face of curl control.
Describe the present invention below with reference to accompanying drawings in more detail, but the present invention is limited to never in the details described below.
Fig. 1 is the schematic diagram of one embodiment of the present of invention, shows the dry end (dry end) of a paper machine, and dry end the past drying section (forward dryer section) of the paper machine that illustrates is up to paper machine reel (reel).
Fig. 2 is the partial schematic diagram of Fig. 1, shows the last cylinder group in the rear portion drying cylinder (after-dryer) of the portion that finishes (finishing section) in the dry end of paper machine.
Fig. 3 shows the result of the test of the curling rule of paper when utilizing the wetting and steam treatment of moisture.
As shown in Figure 1, the paper web W from press section is brought to preceding drying section D
1, adopt single net traction to be positioned at first group of R
0Dry net 15 on, make paper web be adsorbed on that this is online by the vacuum action in the suction box 13.Preceding drying section comprises 7 groups of R that adopt single net traction
0To R
6, the gap paper web that strides across these groups has formed the traction of a sealing.In the accompanying drawings, vertically be that the traffic direction of paper web is represented with arrow S.Drying section D before of the present invention
1In, all single net draw groups R
0To R
NBe so-called conventional group, wherein for example Steam Heating smooth surface drying cylinder 10 is arranged on horizontal row, and oppositely suction cylinder 11 then is arranged on down horizontal row.Cylinder group R
0To R
NQuantity be generally N=4 to 12, preferably 6 to 8.
Each conventional group R
0To R
NDry net 15 with himself, this net is by guide roller 18 guiding.Dry net 15 is pressed at the paper web W that will be dried on the drying cylinder 10 on the level and smooth area of heating surface of this drying cylinder, and paper web W is remaining on the outer surface of net 15 in the bandy side on the reverse rollers 11.On reverse rollers 11, since in the grooved surface of reverse rollers 11 or the vacuum effectiveness that produces in the cover with holes of suitable suction roll make paper web W to resist action of centrifugal force and firmly remain in the support of net 15, by means of this device, can also offset the cross-direction shrinkage of paper web W.When using reverse suction roll, particularly the request for utilization people is with trade mark VacRoll
TMDuring the suction roll sold, this roller does not have inner suction box, about the Finnish patent No.83680 (with United States Patent(USP) Nos. 5022163 and 5172491 identical) of its concrete structure referring to the applicant.
Preceding drying cylinder D in a preferred embodiment of the present invention
1In, by utilizing blow box 17 in operation at least from drying cylinder 10 to reverse cylinder 11, even make support contact between paper web W and the dry net 15 at drying cylinder 10 with oppositely also can keep fully in the traction of the straight line between the cylinder 11, utilize in the wedge shape nip of the sealing of these casees between the cover of net 15 and cylinder 11 and also can prevent the pressure that net 15 forms.Blow box 17 is that the sort of air spurts vacuum blow box, and this case 17 does not communicate with vacuum source.As for these by the applicant with trade mark " UnoRunBlowBox "
TMThe concrete structure of the blow box of selling is referring to applicant's Finnish patent Nos.59637,65460 and 80491 (identical with 4905380 with United States Patent(USP) Nos. 4441263,4516330).The blow box of other known type also can be used for the present invention.
At preceding drying section D
1In, at single net draw groups R
0To R
NIn oppositely also using blow box 16 in the gap between the cylinder 11, utilize the evaporation that produces air conditioning in these case 16 described gaps and can promote paper web.Scraper 14 keeps clean the surface of drying cylinder 10.
At the cylinder group R that adopts single net traction
0To R
NThe middle used preceding drying section D of the present invention
1Also have an advantage, on the whole length of drying section, can adopt and remove broken, because single net draw groups R by means of the gravity effect
0To R
NTo bottom-open, further be transported to pulper so that can the paper web W that damage be removed on the broken conveyer (not shown) of the bottom space that is positioned at paper machine and without any need for special device by this conveyer.
In order to prevent the cross-direction shrinkage of paper web W, particularly importantly, at preceding drying section D
1Interior paper web W keeps firm contacting with dry net 15 always.This maintenance effect produces by means of the vacuum that is produced in the cover 12 of the trough of belt on described cylinder or the analog on reverse cylinder 11, on the linear running between cylinder 10 and the reverse cylinder 11, it is the stress level that is provided with by means of blow box, local also by means of the tension force T of the paper web W on vertical, this tension force T produces a contact pressure P k=T/R (radius of R=cylinder 11) between paper web W and net 15.
As mentioned above, at preceding drying section D
1Interior reverse drying cylinder 11 preferably adopts applicant's Vac
TMRoller.Its vacuum effectiveness expands on the cover 12 of trough of belt from the hole on the reverse cylinder 11, so that oppositely the wedge shape nip between cylinder 11 and the dry net also can be found time effectively, and then pressure can not import in the zone of these wedge shapes, as paper web W during in arranged outside, this pressure may make paper web W separate from dry net.If at preceding drying section D
1The suction roll that provides in the inherent suction box is used as reverse cylinder 11, then the region of no pressure should be extended to a fan-shaped wideer zone of the rotation than dry net 15 and paper web, flowing freely of vacuum effectiveness and air can expand to described tapered region like this, is used for above-mentioned purpose.
Except above-mentioned preceding drying section D
1Outside, the dry end of paper machine of the present invention comprises that also one is arranged on preceding drying section D
1Finishing device D afterwards
2, this finishing device D
2Comprise a mechanical batching apparatus 50, for example a Pope type batching apparatus.A mechanical reel that works online of machinery batching apparatus 50 is with MR
0Expression, and a mechanical reel of finishing is represented with MR.Paper web W is sent to mechanical batching apparatus 50 by calender 40 from a back drying cylinder 30, and this rear portion drying cylinder is arranged on finishes the D of portion
2Apparatus for coating 20 after.
As shown in the figure, being dried to a drying solid thing content this moment is K
2The paper web W of ≈ 96 to 99% is at preceding drying section D
1Enter an apparatus for coating 20 through a paper web guide roller 25 and a measuring stick 26 afterwards, this measuring stick is arranged between the described guide roller 25 and measures the profile character of paper web, and this apparatus for coating 20 can be that the applicant is with SymSizer
TMA kind of apparatus for coating of selling.Apparatus for coating 20 comprises two applicator rolls 21 and 22, their position toward each other, and size feed arrangement 23 links to each other with described two rollers with 24, so that the two sides is applied in the coating nip NS of paper web W between roller 21 and 22.Because coated media contains water, so paper web W two sides quilt in coating nip NS is partly wetting.Then, at preceding drying section D
1Interior that side from its basal surface is carried out processing by the paper web W of the curling trend of having of asymmetric drying, its inner tension force is discharged partly or reduction at least greatly.
In the embodiment shown in fig. 1, finish the D of portion
2Interior rear portion drying cylinder 30 also includes only the cylinder group R that adopts single net traction
21, R
22, R
23With reference to Fig. 2 last cylinder group R in the rear portion drying cylinder 30 that the curl control device is installed in it is described in more detail below
23Two groups of R of the front that penetrates spraying device 19 may be installed
21, R
22With at preceding drying section D
1Interior cylinder group R
0... R
6Similar, and identical parts adopt identical reference numeral.
As shown in Figure 2, the last cylinder group R in the drying cylinder of rear portion
23Comprise that at first one is positioned at drying cylinder 10 and the reverse rollers subsequently or the cylinder 11 in group gap, also comprise one second drying cylinder 10 and reverse cylinder 11 subsequently.After this, be the adjustable cylinder 61 of a temperature, preferably a cylinder that can be cooled.After this, paper web W is sent to and is positioned on following reverse rollers or the cylinder 11, and reaches on adjustable second cylinder 63 of a temperature, and this cylinder is a cooling cylinder preferably.Dry net is with numeral 15 expressions, and its guide roller can move parts with numeral 17 expressions with numeral 18 expressions, and scraper is with 14 expressions, and is identical with situation shown in Figure 1.Last cylinder group R in rear portion drying cylinder 30
23In latter two reverse rollers or the outlet side of cylinder 11, before the adjustable cylinder 61,63 of temperature, a damping device 62 and a steam chest 64 are set preferably.Certainly, these two devices can be damping device or equipment for steam treatment.Wetted/steam treatment before paper web W is sent on the cylinder 61,63, so the cylinder that preferably is cooled of these cylinders 61,63.Paper web W is sent to calender 40 from the cooling cylinder 63 of the back steam chest 65 by guide roller 71, and then arrives batching apparatus 50.
According to the present invention ,/equipment for steam treatment 62,64 wetting by alternately utilizing and utilization cooling cylinder 61,63 cooling paper web W have finished the curling adjusting of paper web in several steps, and this adjusting is quite effective.In this stage, the drying solid thing content of paper web W in the scope of K1...K2, the final drying solid thing of K1=content-7% wherein, the final drying solid thing of K2=content+3%, and the web temperature at steam chest 64,65 places is lower than 85 ℃, is preferably lower than 75 ℃.
As can be seen from the figure, at back cylinder group R
23The interior reverse rollers or the diameter D of cylinder 11
11Diameter D greater than reverse rollers in the previous groups or cylinder 11.For the adjusting of paper web curling test, at back cylinder group R
23In, select the diameter D of reverse cylinder 11
11Diameter D with drying cylinder 10/ cooling cylinder 61,63
0Natural scale so that paper web W also can cool off on the surface of its diameter than common big reverse cylinder 11 in this way, so that the regulating effect that strengthen to curl.Natural scale D
0/ D
11Be 0.75 to 2.5, preferably 1 to 1.5.
Because the lower cylinder of temperature that trial utilization is arranged in the drying section cools off paper web and may use the dry net of himself to circulate still very favourable on described cylinder by means of using larger-diameter reverse cylinder.In this way, the circulation of other heatable cylinder and fourdrinier wire can not the heat drying net, can not heat the paper web in drying section thus.For extra ability is provided, dry net for example can utilize that cold air spurts further cooling.
Though not shown in figures, drying section is to be arranged in a usual manner in the cover, defends malaria, improves the economy that energy utilizes, and strengthen the air conditioning in the drying section.More particularly, the dry net circulation time when use himself at drying section preferably utilizes a partition wall that the other parts of described district and cover are kept apart.In this way, the temperature of dry net reduced levels can be remained on, and the operability of the air conditioning in energy utilization efficiency and the drying section can be improved.
Applicant of the present invention is also noted that the final performance from paper web, carries out described curling adjusting operation and have superiority when paper web for example is supported on the dry net, as illustrated in fig. 1 and 2.The adjusting of curling when paper web is pulled on vertical or horizontal, final result is also relatively good.In Fig. 2, paper web in the end is pulled between drying cylinder and the calender, just when paper web use device 65 during by steam treatment/wetting, is subjected to the effect of tension force in the vertical.
Fig. 3 schematically shows about utilizing the result of the test that moisture is wetting and steam treatment is carried out the curling adjusting of paper web.Y-axis is represented to curl, and X-axis is represented testing site 1 to 3.In the testing site 1, employing be the single face drying, single face drying and steam treatment are adopted in testing site 2, testing site 3 adopts single faces dry and moisture is wetting and steam treatment.When curling mark when being positive, curl and carry out towards end face, when curling mark is when bearing, curlingly carry out towards the bottom surface.As can be seen from the figure, the paper web of single face drying curl terribly (20 units).Only in a step, carry out steam treatment and reduced curling of paper web basically, about 5 units but paper web still curls on original direction.When paper web had carried out before steam treatment when wetting slightly, the direction of curling of paper web even can be reverse then.
Though the present invention preferably uses with the drying section described in the foregoing description, but the present invention never is defined in described solution, the present invention also can together use with the drying cylinder of routine, perhaps adopts other the drying mode except that cylinder dried, as impingement drying.
Claims (30)
1. the drying section at paper machine or board machine is controlled the method that paper web curls, wherein, in the method, adopted the steam treatment of paper web (W) and/or wetting, it is characterized in that in the method, operating in finishing device a plurality of steps before of paper web (W) curl control carried out, the paper web (W) of the drying solid thing content range K1 that finishing device is produced at paper web in the K2, and the temperature of paper web (W) is at least in a step, be lower than 85 ℃, be preferably lower than 75 ℃, the final drying solid thing of K1=content-7% wherein, the final drying solid thing of K2=content+3%.
2. the method for claim 1 is characterized in that in the method, and paper web (W) is at preceding drying section (D
1) inherent cylinder group (R
0... R
n) in utilize drying cylinder (10) to be dried, utilize dry net (15) that it is pressed on the area of heating surface of drying cylinder, after this in the past drying section (D of paper web (W)
1) be sent to (D of the portion of finishing
2), utilize a coating/top sizing device (20) that paper web (W) is coated with/top sizing therein, paper web (W) is dried in a rear portion drying cylinder (30), then handled and be sent to one by press polish in a calender (40) and batch station (50), paper web is reeled on the mechanical reel (MR) therein.
3. method as claimed in claim 1 or 2 is characterized in that in the method, at preceding drying section (D
1) in, paper web (W) is at the cylinder group (R that adopts conventional single net traction
0... R
n) in be dried from its basal surface side.
4. method as claimed in claim 1 or 2 is characterized in that in rear portion drying cylinder (30), and paper web (W) is at the cylinder group (R that adopts conventional single net traction
21, R
22, R
23) in be dried.
5. method as claimed in claim 1 or 2 is characterized in that in the method, at the last cylinder group (R of rear portion drying cylinder (30)
23) in, the natural scale (D of drying cylinder (10) and reverse cylinder (11)
0: D
11) be 0.75 to 2.5.
6. method as claimed in claim 5 is characterized in that in the method, at the last cylinder group (R of rear portion drying cylinder (30)
23) in, the natural scale (D of drying cylinder (10) and reverse cylinder (11)
0: D
11) be 1 to 1.5.
7. method as claimed in claim 1 or 2 is characterized in that in the method, is last cylinder group (R at least
23) in last drying cylinder, preferably in latter two drying cylinder (61,63), the temperature of the drying cylinder that is adopted can be regulated individually.
8. method as claimed in claim 7 is characterized in that in the method, and as the drying cylinder that temperature can be regulated separately, used drying cylinder (61,63) can be cooled.
9. method as claimed in claim 7 is characterized in that in the method, is associated with last drying cylinder (61,63), and paper web (W) utilizes the dry net circulation of himself to be transferred.
10. method as claimed in claim 9 is characterized in that in the method, utilizes one to be arranged on that partition wall in the drying section cover will have the last drying cylinder of dry net circulation of himself and the other parts of cover are kept apart.
11. method as claimed in claim 9 is characterized in that in the method, the dry net in the described dry net circulation is cooled.
12. method as claimed in claim 1 or 2, it is characterized in that in the method, carry out in the last cylinder group that is adjusted in drying section of curling, so that utilize a damping device (62) moistening paper web (W), after this on paper web (W) is sent to subsequently reverse cylinder (11) along the dryer surface of first cylinder (61) that can be cooled, wherein paper web (W) utilizes a steam chest (64) by steam treatment or utilize a damping device wetted, then paper web (W) along the surface of cooling cylinder (63) by a steam chest (65) or a damping device to calender (40).
13. method as claimed in claim 12 is characterized in that in the method, paper web (W) curl regulate before by over-drying.
14. the method for claim 1 is characterized in that in the method, in the process of carrying out steam treatment/wettability treatment, paper web (W) is vertically supported or remain on traction state.
15. the method for claim 1 is characterized in that in the method, paper web (W) is in the process of carrying out steam treatment/wettability treatment or be right after be subjected to the expansion effect after this processing.
16. a paper machine or board machine, it comprises at least one flow box, a building mortion, one squeezer and a drying section, steam chest or damping device have wherein been used, be used to control curling of paper web, it is characterized in that for being implemented in the curling adjusting of paper web in a plurality of steps, have at least two described curling adjusting devices, and curling the operating in finishing device a plurality of steps before of being carried out of control paper web (W) carried out, the paper web (W) of the solid contents scope K1 that finishing device is produced at paper web in the K2, and the temperature of paper web (W) is lower than 85 ℃ at least in a step, be preferably lower than 75 ℃, the final drying solid thing of K1=content-7% wherein, the final drying solid thing of K2=content+3%.
17. paper machine as claimed in claim 16 or board machine is characterized in that described drying section comprises a preceding drying section (D
1) and one finish the (D of portion
2), this finishes (the D of portion
2) comprise a coating/size applicator (20), a rear portion drying cylinder (30), a calender (40) and batches station (50).
18., it is characterized in that preceding drying section (D as claim 16 or 17 described paper machine or board machines
1) comprise and adopt conventional single cylinder group (R that nets traction
0... R
6).
19., it is characterized in that the cylinder group (R in the rear portion drying cylinder (30) as claim 16 or 17 described paper machine or board machines
21, R
22, R
23) be the cylinder group that adopts conventional single net traction.
20., it is characterized in that in the last cylinder group of rear portion drying cylinder (30) natural scale (D of drying cylinder (10) and reverse cylinder (11) as described paper machine of claim 16 to 17 or board machine
0: D
11) be 0.75 to 2.5.
21. paper machine as claimed in claim 20 or board machine is characterized in that in the last cylinder group of rear portion drying cylinder (30), the natural scale (D of drying cylinder (10) and reverse cylinder (11)
0: D
11) be 1 to 1.5.
22., it is characterized in that it being the interior last cylinder group (R of rear portion drying cylinder (30) at least as claim 16 or 17 described paper machine or board machines
23) in last drying cylinder, what preferably latter two drying cylinder (61,63) adopted is the drying cylinder that temperature can be regulated individually.
23. paper machine as claimed in claim 22 or board machine is characterized in that the drying cylinder that described temperature can be regulated separately is the drying cylinder (61,63) that can be cooled.
24. paper machine as claimed in claim 22 or board machine is characterized in that last drying cylinder (61,63) has the dry net circulation of himself.
25. paper machine as claimed in claim 24 or board machine is characterized in that the cover of described drying section has a partition wall, whereby the dry net circulation of last drying cylinder (61,63) are kept apart with the other parts of drying section cover.
26. paper machine as claimed in claim 24 or board machine is characterized in that the dry net in the dry net circulation of described last drying cylinder (61,63) can be cooled.
27. as claim 16 or 17 described paper machine or board machines, the adjusting device that it is characterized in that curling is arranged in the last cylinder group of drying section, one damping device (62) is arranged on first cylinder (61) that can be cooled before, so that moistening paper web (W), one steam chest (64) or a damping device are arranged on second cylinder (63) that can be cooled before, and a steam chest (65) or a damping device are arranged on paper web (W) and are sent to calender (40) before.
28. paper machine as claimed in claim 27 or board machine, it is characterized in that paper web (W) curl regulate before by over-drying.
29. paper machine as claimed in claim 16 or board machine is characterized in that in the process of carrying out steam treatment/wettability treatment, paper web (W) is vertically supported or be pulled.
30. paper machine as claimed in claim 16 or board machine is characterized in that at steam treatment/wettability treatment device or are right after being provided with a paper web (W) expanding unit after this device.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI971301A FI971301A (en) | 1997-03-27 | 1997-03-27 | Method for controlling paper curl with a dryer section of a paper machine and a paper or board machine |
| FI971301 | 1997-03-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1251629A CN1251629A (en) | 2000-04-26 |
| CN1101499C true CN1101499C (en) | 2003-02-12 |
Family
ID=8548489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98803774A Expired - Fee Related CN1101499C (en) | 1997-03-27 | 1998-03-23 | Method for control of curl of paper in dryer section of paper machine and paper or board machine |
Country Status (10)
| Country | Link |
|---|---|
| EP (1) | EP1012383B1 (en) |
| JP (1) | JP3660360B2 (en) |
| CN (1) | CN1101499C (en) |
| AT (1) | ATE329082T1 (en) |
| AU (1) | AU6502198A (en) |
| BR (1) | BR9808431A (en) |
| CA (1) | CA2284053C (en) |
| DE (1) | DE69834820T2 (en) |
| FI (1) | FI971301A (en) |
| WO (1) | WO1998044191A1 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI112684B (en) | 1999-03-23 | 2003-12-31 | Metso Paper Inc | Method for Measuring and Adjusting Curvature of a Paper or Cardboard Web and a Paper or Cardboard Machine Line |
| FI106269B (en) | 1999-05-10 | 2000-12-29 | Valmet Corp | Blow arrangement and method for compensating the curl tendency of paper or cardboard webs and a paper or cardboard machine |
| JP4651314B2 (en) * | 2004-06-15 | 2011-03-16 | レンゴー株式会社 | Surface smoothing equipment for paper and paperboard |
| DE102005034065A1 (en) * | 2005-07-21 | 2007-01-25 | Voith Patent Gmbh | drying section |
| US8277610B2 (en) | 2007-04-10 | 2012-10-02 | Xerox Corporation | Mechanical fiber paper with controlled curl |
| DE102010039093A1 (en) * | 2010-08-09 | 2012-02-09 | Voith Patent Gmbh | Method and device for controlling the moisture of a material web |
| CN103669088A (en) * | 2012-09-10 | 2014-03-26 | 国能纸业有限公司 | Front drying system used for multi-cylinder long mesh paper machine |
| EP2765237B1 (en) | 2013-02-06 | 2016-11-23 | Valmet Technologies, Inc. | Method for producing a fiber web and production line for producing a fiber web |
| CN104859291B (en) * | 2015-04-13 | 2017-12-29 | 京东方科技集团股份有限公司 | A kind of drying device and its drying means |
| CN110446811B (en) * | 2017-03-21 | 2021-06-04 | 福伊特专利有限公司 | Web treatment |
| CN108166315A (en) * | 2017-12-08 | 2018-06-15 | 安徽金亿禾特种纸有限公司 | A kind of method of modifying for making carbon copies paper web |
| CN112748237B (en) * | 2020-12-29 | 2022-06-10 | 亚太森博(广东)纸业有限公司 | Original warping detection method for copy paper |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5416980A (en) * | 1990-12-17 | 1995-05-23 | Valmet Paper Machinery, Inc. | Method and apparatus for reduction of curling of paper in the drying section of a paper machine |
| EP0726353A2 (en) * | 1995-02-01 | 1996-08-14 | Valmet Corporation | Method for producing surface-treated paper and dry end of a paper machine |
| US5557860A (en) * | 1994-09-16 | 1996-09-24 | Voith Sulzer Papermaschinen Gmbh | Dryer section with moistening devices at latter ends |
-
1997
- 1997-03-27 FI FI971301A patent/FI971301A/en not_active Application Discontinuation
-
1998
- 1998-03-23 WO PCT/FI1998/000253 patent/WO1998044191A1/en active IP Right Grant
- 1998-03-23 CA CA002284053A patent/CA2284053C/en not_active Expired - Fee Related
- 1998-03-23 AU AU65021/98A patent/AU6502198A/en not_active Abandoned
- 1998-03-23 JP JP54118598A patent/JP3660360B2/en not_active Expired - Fee Related
- 1998-03-23 DE DE69834820T patent/DE69834820T2/en not_active Expired - Lifetime
- 1998-03-23 CN CN98803774A patent/CN1101499C/en not_active Expired - Fee Related
- 1998-03-23 EP EP98910766A patent/EP1012383B1/en not_active Expired - Lifetime
- 1998-03-23 AT AT98910766T patent/ATE329082T1/en not_active IP Right Cessation
- 1998-03-23 BR BR9808431-3A patent/BR9808431A/en not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5416980A (en) * | 1990-12-17 | 1995-05-23 | Valmet Paper Machinery, Inc. | Method and apparatus for reduction of curling of paper in the drying section of a paper machine |
| US5557860A (en) * | 1994-09-16 | 1996-09-24 | Voith Sulzer Papermaschinen Gmbh | Dryer section with moistening devices at latter ends |
| EP0726353A2 (en) * | 1995-02-01 | 1996-08-14 | Valmet Corporation | Method for producing surface-treated paper and dry end of a paper machine |
Also Published As
| Publication number | Publication date |
|---|---|
| DE69834820T2 (en) | 2006-11-09 |
| FI971301A0 (en) | 1997-03-27 |
| BR9808431A (en) | 2000-05-23 |
| EP1012383A1 (en) | 2000-06-28 |
| EP1012383B1 (en) | 2006-06-07 |
| ATE329082T1 (en) | 2006-06-15 |
| CN1251629A (en) | 2000-04-26 |
| AU6502198A (en) | 1998-10-22 |
| DE69834820D1 (en) | 2006-07-20 |
| JP3660360B2 (en) | 2005-06-15 |
| JP2001503484A (en) | 2001-03-13 |
| FI971301A (en) | 1998-09-28 |
| WO1998044191A1 (en) | 1998-10-08 |
| CA2284053A1 (en) | 1998-10-08 |
| CA2284053C (en) | 2005-11-22 |
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