CN104246065B - For the method and apparatus changing the formation in paper web face - Google Patents
For the method and apparatus changing the formation in paper web face Download PDFInfo
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- CN104246065B CN104246065B CN201280065313.4A CN201280065313A CN104246065B CN 104246065 B CN104246065 B CN 104246065B CN 201280065313 A CN201280065313 A CN 201280065313A CN 104246065 B CN104246065 B CN 104246065B
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- paper web
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/009—Fibre-rearranging devices
Abstract
The method and apparatus that the present invention relates to the orientation of a kind of paper fiber (3) for changing in paper web face, and a kind of paper machine with this device.By the waterborne suspension that paper fiber (3) is constituted is applied on screen cloth define the paper web face of still humidity.Discharge at least one times through still moist paper web face and/or from the surface generation of paper web face (9).
Description
Technical field
The method that the present invention relates to the formation of a kind of paper fiber for changing in paper web face, one is used for
Implement the device of this method and a kind of paper machine with this device.
Background technology
Paper sheet formation be papermaking during an important flow process.Make for this to be distributed as uniformly as possible in paper
Suspension on breadth width, that be made up of paper fiber, auxiliary material and water flows to paper sheet formation dress
Put, the screen cloth part of such as industrial sheet making machine.Such as in fourdrinier machine, fibrous suspension is endless
Flow on the screen cloth of cincture.
The quality of paper is additionally formed decision by so-called, namely fiber layout in paper, orientation
And distribution.Generally, due to layout and the high screen cloth speed of the screen cloth in industrial sheet making machine, the paper of paper is fine
Dimension major part is all along the direction of motion of screen cloth so that the attribute of paper, such as tensile strength or longitudinal direction
Ductility, longitudinally to the biggest with difference in two principal directions in paper web face.In order to allow paper web
Face has similar attribute longitudinally to in two principal directions in paper web face, such as, allow
Paper obtains higher tensile strength on the direction transverse to paper web face, is necessary for allowing ratio the most more
Many fibers, transverse to the direction of motion of screen cloth, allow fiber the most isotropically be orientated in other words.
When paper sheet formation it can also happen that flocculation (Flockenbildung), say, that at paper
Being formed in tissue and have a position that fiber intensity is higher, the most so-called wadding is, and formed and have
The position that fiber intensity is relatively low.Thus outward appearance, flatness and the intensity of paper is produced disadvantageous shadow
Ring.In order to realize the improvement in terms of formation, it is necessary to avoid flocculation at the very start, or must be at sieve
First the wadding of formation is decomposed or destroys by wet end again, thus allows fiber be more evenly distributed.
Attempt up to now is by adjusting different procedure parameters, such as adjusting and poured into by suspension
Dump angle on screen cloth of volume velocity on screen cloth, suspension and screen cloth speed, not only affect in paper
The orientation of fiber and distribution, have an effect on the dehydration in the most so-called wet end on screen cloth.But shape
One-tenth is to be determined by different parameters, and these parameters can only can pass through tradition under certain conditions
Paper process be affected.
Summary of the invention
Therefore, it is an object of the invention to improve the formation in paper web face.
This purpose is addressed by the method for the formation for changing the paper fiber in paper web face, its
In, by the aqueous suspension of paper fiber is applied on screen cloth be formed the paper web face of still humidity, wear
Cross still moist paper web face and/or start to produce from the surface in paper web face and discharge at least one times.Additionally,
This purpose is addressed also by a kind of device for the formation of the paper fiber changed in paper web face, should
Device includes that the electrode with at least one electrode is arranged, wherein, can guide by the water by paper fiber
Shape suspension is applied on screen cloth that formed, still moist paper web face and arranges through this electrode so that
Paper web face is opened with at least one electrode separation by air gap, and includes for arranging at least at electrode
At least one first electrode and at least arranged between one the first electrode and paper web face or at electrode
Alive connecting line is executed, for through paper web face and/or from paper web face between one the second electrode
Set out to produce and discharge at least one times in surface.And this purpose obtains also by the paper machine of assembly of the invention
To solve.
The present invention describes a kind of method innovation, it by utilize production process rest point or
The improvement that electric discharge realizes being formed is carried out when will arrive rest point or at the end of rest point is just.Work as fiber
It is no longer able to move freely in fibrous suspension, but when being already fixed on screen cloth, has arrived quiet
Stop." form " this concept and not only include the distribution in paper web face of the paper fiber at this, also include
The orientation of fiber, say, that its orientation.The basic concept of the present invention is by the wet district in papermaking
The pressure wave applying to be caused by shelf depreciation partly changes or impact is formed, the namely fiber in paper
Orientation and distribution.Sharp round the pressure wave of certain discharge channel or electric discharge basic point (Fu β punkt)
It is used in fibrous layer or paper web face, bringing energy into partly, thus the most again decomposes or destroy
The wadding formed, therefore realizes being distributed more uniformly of fiber, and from side extruded paper fiber, because of
The orientation of this fiber have higher statistically.Fiber is limitedly (that is in certain scope)
Elastic recovery makes the region of discharge channel substantially be again switched off, thus will not leave behind in paper web face
Because the hole that electric discharge causes.
The present invention realizes the improvement formed, namely paper web face by using electric discharge during paper-making process
The distribution of middle paper fiber, particularly cellulose fibre and orientation.By this new method the most just
The paper web face of better quality it is capable of for formation.Thus improve the outward appearance of paper, flatness and intensity.
Therefore the optimization production procedure that substandard products are less can not only be realized, additionally it is possible to produce the product of better quality
Product, it is also possible to make the profit that can reach higher.
One according to the present invention is advantageously improved scheme, and described electric discharge at least one times is that dielectric barrier is put
Electricity.Electric discharge is preferably advised under atmospheric pressure carrying out medium barrier discharge (DBE).Dielectric barrier is put
Electricity (English: Dielectric Barrier Discharge, DBD) is also with " voltolising " this name
Well known to claiming.It is a kind of gas discharge.
According to the present invention, discharge at least one times to produce, apply the voltage to
A) between at least one first electrode and still moist paper web face, or
B) between this at least one first electrode and at least one second electrode.
Here, it is favourable for utilizing electrolyte at least to cover at least one first electrode.This makes extremely
Few air gap between an electrode and paper web face or between two electrodes can occur electrolyte gesture
Discharge electricity.Preferably, dielectric layer is permanently connected with electrode.
Wherein, in the case of b) preferably, guide moist paper web face through comprising the first He
The electrode of the second electrode is arranged, wherein, the first and second electrodes are arranged in the different side in paper web face
On.It is also advantageous that, when this device has the layout of at least two electrode, wherein, it is positioned at paper web
In the electrode of two mutual correspondences on the opposite side (discharging between them) in face at least
There is an electrode to scribble and play the electrolyte that " potential barrier " of insulation acts on.
One according to the present invention is advantageously improved scheme, moist paper web face be guided through comprise to
The layout of few two electrodes, this layout preferably comprises the first and second electrodes, wherein, in paper web face
Every side on all arrange at least one electrode, it is preferable that the first and second electrodes are arranged in paper web
On the not ipsilateral in face.Wherein, apply between the electrode on the opposite side in paper web face to be used for
Produce the voltage discharged at least one times.
Only having in an embodiment scribbling dielectric electrode a kind of, this electrode is the most only
It is positioned at being directed through on the side of this electrode with corresponding feeding speed of paper web face, wherein, is applying
During sufficiently high voltage, between electrode surface and paper web face, produce DBE.
At least one of which in two electrodes is covered, then be impossible to two if, with electrolyte
Direct, the electric discharge of heavy current is formed between individual electrode.When realizing sufficiently high voltage in-between the electrodes,
Wherein an electrode and corresponding, complete in the gas compartment between the electrode of dielectric barrier
Weak current, high localized gas discharge；So that electrolyte charges partly so that electricity
Pressure declines again, and electric discharge terminates automatically.This process is referred to as medium barrier discharge.This put
The feature of electricity is that electric discharge starting point is at typically smaller than 1cm2Potential barrier on, and putting under atmospheric pressure
A diameter of tens microns of electric channel.
According to a kind of preferably structural scheme of the present invention, still moist in the wet end of paper machine
Discharge at least one times in paper web face.In wet end, the pliability of the paper fiber in paper web face is still inadequate,
It is possible to the power utilizing pressure wave smaller, that cause due to shelf depreciation to produce realizes again taking
To, namely change orientation.Here it is preferred, in particular, that implement the party in certain specific region
Method, arranges the electrode for producing electric discharge, i.e. in other words in this district in certain specific region
In territory, moist paper web mask has at least 20%, preferably at least 75%, more preferably exist
Moisture between 80 to 90%.
If forming paper web face on fourdrinier machine, then the most also on screen cloth or in humidity
Paper web face come off from screen cloth after directly discharge.But, as long as paper is the moistest,
Can also discharge again a bit evening.According to machine type and the kind of paper, paper web face at the end of screen cloth part,
I.e. in the place that will arrive press section, there is the moisture of about 75% to 80%.The method is also
Can be used in the paper machine with other the paper sheet formation system being different from long screen cloth, be used for example in
Have in the paper machine of Aladdin former.Preferably, in the situation of the paper machine with Aladdin former
Under, discharge in certain specific region of screen cloth part, in this region, paper web face only has it
Bottom side is guided by screen cloth, and its upside (as in long screen cloth) " being exposed ".
Preferably, the alternating voltage in the range of this voltage is 1kV to 30kV.Preferably, should
Alternating voltage has in the range of 1Hz to 500kHz, but particularly at 10Hz to 50kHz
In the range of frequency.It is further preferred that this voltage has sinusoidal, rectangle, triangle
, jagged, the trapezoidal or change curve of impulse form.In order to manufacture barrier discharge, need
Want the alternating voltage of several kilowatts (kV) to tens kilowatts (typically smaller than 30kV), according between electrode
Depending on, air pressure and air humidity, gas composition etc..Preferably with tens hertz Dao several ten thousand hertz
Frequency provide high pressure.Can also be the voltage change curve of triangle, or perhaps described
Voltage in voltage and frequency range, that apply in the form of a pulse with corresponding repetition rate.
According to a kind of preferably structural scheme of the present invention, the value of the air gap between paper web face and electrode exists
In the range of 1 to 100mm, preferably in the range of 2 to 50mm, it is more preferably 2
To 10mm.Generally supported paper web face at screen cloth part by screen cloth or press felt, until press section
Cross-connecting area with drying section.Paper web face generally will not be exactly at identical height with the screen cloth carrying out supporting
Stablize mobile on degree, but mechanical vibration occur.The air gap selected preferably is greater than these machineries and shakes
Dynamic amplitude.
According to the preferred structural scheme of one, select dielectric thickness, enabling prevent from puncturing this
Electrolyte.Pottery, glass, glass ceramics is had for dielectric suitable material, or can also
Use plastics.Wherein, the numerical value of dielectric relative dielectric constant can about 2 (such as glass,
Plastics) between more than 10 (such as aluminium oxide ceramics), or can also be thousand of (such as metatitanic acids
Barium).Select dielectric thickness so that the total voltage of to be applied up to several kilovolts is not result in electricity
Medium punctures；Therefore, thickness to be selected according to material, but thickness is the thinnest.
According to the preferred structural scheme of one, the layout of electrode extends on the whole width in paper web face.
Can realize simultaneously on the width in whole paper web face and the lengthwise of paper web face by large-area electrode bar
Corresponding part upper produce very many discharge channels.Then, plasma power corresponding high time,
Just can rearrange most fiber statistically, thus relate to whole paper web on the whole
Realize fiber in the case of face to reset.Can be targetedly by controlled plasma power shadow at this
Ring the intensity of effect.Even if this Jie under atmospheric pressure can also be carried out on the biggest area to scale
Matter barrier discharge, though thus paper translational speed quickly and paper web face the widest in the case of also can
Enough realize good flow monitoring.
Accompanying drawing explanation
Description in conjunction with the following embodiment to combining accompanying drawing elaboration can become apparent from and brighter
Really understand the features described above of the present invention, feature and advantage, and realize the side of these feature and advantage
Formula and method.Figure respectively schematically and not to scale illustrates:
Fig. 1 shows during the method for the formation for changing paper fiber, the fibre in paper web face
The situation of change of the orientation of dimension；
Fig. 2 shows during the method for the formation for changing paper fiber, the fibre in paper web face
The situation of change of dimension distribution；
Fig. 3 shows that electrode is to the outside drawing relative to paper web face；
Fig. 4 shows the sectional view that the first electrode is arranged；
Fig. 5 shows the sectional view that another electrode is arranged；
Fig. 6 profile shows a part for paper machine；And
Fig. 7 outside drawing shows paper machine.
Detailed description of the invention
Fig. 1 includes subgraph 1a to 1c, and they show the whole order of fibre orientation, and they are just
A fibrolaminar amplification plan view in that shape, still moist paper web face.This order explanation
It is to pass when the device changing the formation of paper fiber in paper web face in paper web face, the fibre in paper web face
The change of the orientation of dimension 3.
Fig. 1 a shows a kind of initial state, wherein, the paper fiber in fibrous layer the most in formation
3 be primarily oriented is along screen movement direction 21.This notable each to the fibre orientation of dissimilarity
Initial state it is usually because the layout of screen cloth in industrial sheet making machine and high screen cloth speed and formed.
The original orientation of fiber 3 is along screen movement direction 21, as it is by screen movement direction
As on 21, on the screen cloth of motion, fibrous material is given under conditions of batching.
Fig. 1 b shows just along discharge channel through that formed, moist paper web face
The state that fibrous layer is formed after discharging.The atmospheric pressure Reeb generated by electric discharge is to paper web face
The fiber 3 being arranged in fibrous layer applies power.The firmness arranged in fibrous layer according to fiber 3,
Pressure wave or fiber can be elapsed on whole lengthwise, and by its from discharge channel 8 outwards
Extrude, or on a part of lengthwise, only act on fiber 3, and only by one section of fiber 3
Push out away from discharge channel 8.Make by this way fiber 3 adjustment direction discriminatively and/
Or bending.From the point of view of the globality of fiber 3, electric discharge causes the pressurized Reeb in still moist paper web face
The orientation generation significant change of the paper fiber 3 in the subregion of impact.
Fig. 1 c shows the state after a period of time after electric discharge.Discharged a period of time it
After, generally in several seconds, elastic-restoring force functions to, and it makes individuals fibers 3 or can also
Some sections only making individuals fibers reply position, recover the most at least in part because of pressure wave
The direction caused adjusts and/or bending.By this way, those after just discharging (as figure
As shown in 1b) it is arranged only at the fiber beyond discharge channel 8 and turns again at least in part put
In electric channel 8.That is, fiber limited, namely the elastic recovery in certain limitation cause putting
The region of electric channel 8 is substantially again switched off, thus does not leave hole in paper web face.
Fiber 3 in figure 1 c shown in state of orientation be kept essentially constant, and still continue in paper web face
The continuous process step immediately after carrying out paper machine.After whole paper machine, due to electric discharge
The fiber condition of reorientation is kept essentially constant in finished paper.
Fig. 2 includes subgraph 2a to 2c, and they show that fiber forms the whole order of distribution, they
It it is certain the fibrolaminar amplification plan view being orientated that shaping, still moist paper web face.This
Order explanation is to pass when the device changing the formation of paper fiber in paper web face in paper web face, paper web
The change of the distribution of the fiber 3 in face.
Fig. 2 a shows a kind of initial state, wherein, forms wadding 30 in the fibrous layer of paper fiber.
Fig. 2 b shows just along discharge channel 8 through that formed, moist paper web face
The state that fibrous layer is formed after discharging.The atmospheric pressure wave direction wadding 30 produced owing to discharging
Fiber 3 applies power.Pressure pulse formula promotes fiber to be separated from each other so that wadding and agglomerate decompose or
At least it is obviously reduced.The firmness arranged in fibrous layer according to fiber 3, pressure wave can be by fibre
Dimension elapses on whole lengthwise, and by its from discharge channel 8 to extrusion, or only at one
Divide and act on fiber 3 on lengthwise, and only extrapolated from discharge channel 8 by one section of fiber 3
Go.Make fiber 3 adjustment direction discriminatively and/or bending by this way.Entirety from fiber 3
From the point of view of property, electric discharge causes the paper fiber 3 being stressed in the subregion of wave action in still moist paper web face
Distribution generation significant change.
Fig. 2 c shows the state after a period of time after discharge.In a period of time of discharging
Afterwards, generally in several seconds, elastic-restoring force functions to, and it makes individuals fibers 3 or also may be used
Only to make some sections of individuals fibers reply position, recover the most at least in part because of pressure
The direction that ripple causes adjusts and/or bending.By this way, those after just discharging (as
As shown in Fig. 2 b) it is arranged only at the fiber beyond discharge channel 8 and the most again returns
In discharge channel 8.That is, fiber limited, namely the elastic recovery in certain limitation lead
The region causing discharge channel 8 is substantially again switched off, thus does not leave hole in paper web face.
Fiber 3 in figure 2 c shown in state of orientation be kept essentially constant, and still continue in paper web face
The continuous process step immediately after carrying out paper machine.By through whole paper machine so that owing to putting
The fiber condition of electricity reorientation is kept essentially constant in finished paper.
For the sake of clarity, the electric discharge impact on being formed, i.e. fiber are separately observed in fig 1 and 2
The change of orientation/orientation and the change of distribution.But it is clear that, actually two effects are same
Time occur and influence each other.
Fig. 3 shows the outside drawing of the device 1 of the orientation for changing the paper fiber in paper web face, its
In, this device 1 has the electrode relative to paper web face 9 to 2a, 2b.The electrode 2a of top is at it
The electrolyte 22 of dielectric layer form it is coated with on the side in orientation paper web face.Electrode 2a, 2b and paper
The distance values of breadth 9 is respectively in the range of 2 to 10mm so that electrode 2a, 2b and paper web face 9
Between form a uniform air gap respectively, can transport still by registration rollers 12 through these air gaps
The moistest paper web face 9.The width of electrode 2a, 2b is substantially equal to the width in paper web face 9.Electrode
2a, 2b are connected with voltage source 5 by conductor rail 4, such that it is able at electrode 2a, apply between 2b
Voltage.
Advantageously, two electrode 2a, 2b are configured to the form one-tenth of electrode bar.Electrode bar includes
Many that be arranged side by side in a plane, for manufacturing the single electrode of discharge channel.Can be at paper
On the basis of the multiple discharge channels manufactured on the width of breadth, can be in all regions in paper web face 9
The uniform fibre orientation of interior realization and fiber distribution.
Select the height of voltage as follows, i.e. make electrode to 2a, the air gap between 2b whole
Transversely occur at least one times through the electric discharge in paper web face 9.Preferably empty by the surrounding in paper web face 9
Gas completes electric discharge, i.e. gas discharge.Led to along each electric discharge by the pressure wave produced along with electric discharge
Road causes the reorientation of fiber.The scope of fiber reorientation or efficiency also rely on electrode 2a, 2b
Between spacing (width of air gap), air pressure, air humidity, air composition, each cellosilk
(Fliament_) the quantity of electric charge (discharge channel), the voltage applied, each filametntary active region
Etc..
When only using the electrode that has dielectric coating, select voltage as follows, i.e. make
Dielectric barrier electric discharge is formed in air gap between paper web face 9 and this electrode.Select the most as follows at this
Select the size of this air gap, i.e. make when mechanical vibration occurs in paper web face, between paper web face and electrode
Do not come in contact.
Next illustrate the ability to when papermaking for improveing the power consumption of the medium barrier discharge of formation
Rough estimate.Here basic concept is, energy content limited, in barrier discharge camber office
Discharge channel portion, scattered (so-called cellosilk) is for by the local pressure of barrier discharge
Ripple (effect of similar cavitation bubble) mobile and/or curved fiber.The assumed condition summed up in Table 1
It is by the basis estimated: 1mm2
Table 1
Therefrom calculate the minima of concrete energy requirement E/A (ENERGY E of unit are A):
E/A=1nC*10kV/1mm2=10-9As*104V/10-6m2=10J/m2
Under typical machine parameter, such as screen cloth speed v=20m/s and paper web face width degree w=6m,
That is area/time=6*20m2/ s=180m2/ s, in order to produce what plasma needed in theory
Minimum power PplasmaFor
Pplasma=10J/m2*180m2/ s=1.8kW
Frequency now is a few KHz, and this most easily realizes, because this is little current transformer
Exemplary power scope.Extra electrical loss is not accounted in this rough estimate.
It means that utilize several kilowatts (if the pressure wave scope estimated is less than the scope assumed,
Big tens kilowatts) in the range of power can implement such flow process economically, additionally, the intensity of paper
Can also promote, because creating atomic group during DBD to be additionally formed the form of hydrogen bond.
Fig. 4 shows that the intercepting figure that the first electrode is arranged, the first electrode are arranged and is substantially equivalent to Fig. 3
Shown in electrode arrange.The paper web face 9 formed by the still moist fibrous layer of paper fiber is by screen cloth
6 support, and are transmitted on the traffic direction 21 of screen cloth by it.Cloth on the upside in paper web face 9
Put the first electrode 2a covering dielectric layer 22, the downside in paper web face 9 arranges second
Electrode 2b.Electrode 2a, 2b and paper web face 9 are spaced from each other by air gap d respectively.Electrode passes through
Conductor rail 4 electrically connects with voltage source 5.At electrode 2a, between 2b, it is applied with sufficiently high voltage
In the case of, discharge through paper web face.In order to not adversely affect electric discharge, screen cloth is not by
The material of conduction is constituted, such as, be made up of plastics.
The the first electrode 2a being arranged on paper web face 9 can maintain static, or the form with roller
Or as abutting in band structure on paper web face 9, that be made up of the material (such as metal tape) conducted electricity
Becoming, it moves with the same speed of screen cloth 6.As the replacement of the second electrode 2b that position is fixed,
It is arranged in the second electrode 2b below paper web face 9 and is configured to abut on screen cloth 6, by conduction material
The band that material (such as metal tape) is constituted is constituted, and it moves with the same speed of screen cloth 6.
Fig. 5 shows the intercepting figure that electrode instead is arranged.By the still moist paper of paper fiber
The paper web face 9 that fiber is constituted is supported by the screen cloth 6 automatically moved, and by it in the operation side of screen cloth
Transmit on 21.The the first electrode 2a covering dielectric layer 22 is arranged on the upside in paper web face 9.
The screen cloth being constructed from a material that be electrically conducting is electrically connected with voltage source 4 by conductor rail 4, such as, rubbed by slip
Wipe contact.Here screen cloth can be made up of metal as copper or essence steel, or by containing conduction
The plastics of element (such as metallic element) are made.Therefore, screen cloth constitutes the second electrode.First electrode
2a and paper web face 9 are spaced-apart by the air gap with width of air gap d.First electrode 2a passes through
Conductor rail 4 electrically connects with voltage source 5.The voltage foot applied between the first electrode 2a and screen cloth 6
In the case of enough height, the surface through paper web face and/or from paper web face 9 starts to discharge.
The high electric conductivity caused due to the moisture in still moist paper web face, paper web face and screen cloth
Conductively connected, and therefore itself be an electrode.Therefore, at the first electrode 2a and screen cloth 6
Between apply voltage sufficiently high in the case of, it is also possible between the first electrode 2a and paper web face 9
Occur once to discharge, particularly from the electric discharge on the surface in paper web face 9.
Fig. 6 profile shows material devices for taking-up 20 and the screen cloth part 10 of paper machine.At material
In devices for taking-up 20.The fibrous suspension being made up of paper fiber, auxiliary material and water passes through dieplate
11 come on the screen cloth 6 of endless cincture.Then, suspension passes through on the traffic direction 21 of screen cloth
The following assembly of screen cloth part 10: register roller (Registerwalze) the 12, first moisture absorption case 13a,
Monofilm the 14, second moisture absorption case 13b, dandy roll 19, suction box 15.In screen cloth part water suction rolling 17
In region, the paper web face being made up of fibrous suspension during this period comes off from screen cloth 6, and towards making
The press section of paper machine is run.Roller 18 and breast roll 16 is driven to be transmitted back to by empty screen cloth by screen cloth
Screen cloth platform (Siebtisch) 11.
The theoretical description of paper sheet formation below scheme: once fibrous suspension contacts with screen cloth 6, just
On screen cloth 6, paper fiber is promoted by the flow resistance of paper fiber.So that start shape on screen cloth
Becoming fibrous layer, fibrous layer constantly increases.According to the freedom of motion of fiber in suspension, occur two kinds
The paper sheet formation of multi-form: filter and concentrate.It can be seen that account for master from the composition of major part paper
Lead is to filter: when dehydration, the fibrous layer (the most so-called fiber mat) formed on screen cloth
And between suspension above, form obvious transition.Material concentration during fluid stage is the most permanent
Determine, and these fibers can move freely each other.
Paper fiber in fibrous layer is exposed in the electric discharge between electrode 2, and paper fiber now is all being made
In the wet end region of paper machine, such as in screen cloth part 10 region.In this process it is possible that
Including two electrodes 2 for changing the device 1 of the paper fibre orientation in paper web face, they are arranged in sieve
In the upper and lower of net 6, the such as region between two moisture absorption case 13b and dandy roll 19,
As the most as shown in FIG. 6.
Fig. 7 outside drawing shows that paper machine 7, material devices for taking-up 20 and screen cloth part 10 are positioned at it
In the part on the left side.In the region of couch roll squeezing (Gautschpresse) 28, during this period by fibre
The paper web face 9 that dimension suspension is formed comes off from screen cloth 6, and and then towards the traffic direction of screen cloth
21 enter wet pressing area 23, and it presses wet felt 24 to still moist paper web face 9.Paper machine 7 with
After process step include a series of drying cylinder 25, they by use heat energy paper web face is further dried
9.Can distinguish wet end 26 and drying section 27 in principle in paper machine 7, their boundary is basic
On by paper web face 9 moisture determine.In the figure 7, wet end 26 about extends to use
The end of wet felt 24.
By arranging for changing the device of the orientation of paper fiber in paper web face in wet end 26, permissible
By utilizing the pressure wave caused by electric discharge to realize the optimized orientation of cellulose fibre.
Generally speaking it is ensured that the present invention relates to a kind of paper fiber for changing in paper web face
The method and apparatus of orientation, and a kind of paper machine with this device.By by paper fiber structure
The waterborne suspension become is poured on screen cloth and defines still moist paper web face.Through still humidity
Paper web face manufactures discharges at least one times.
Although at large illustrating and illustrate the details of the present invention by preferred embodiment, but this
Bright do not limited to by disclosed example, and professional and technical personnel can therefrom be derived other change
Change scheme, and without departing from protection scope of the present invention.
Claims (14)
1. the method being used for changing the shaping of the paper fiber (3) in paper web face (9), wherein,
Fibre orientation and fiber in described paper web face are distributed by the pressure wave triggered by shelf depreciation
Local action change in the wet zone of paper machine, wherein, produce through by fine for described paper
The waterborne suspension that dimension (3) is constituted is applied to the upper still moist institute shaped of screen cloth (6)
State paper web face (9), and/or putting at least one times from the surface of described paper web face (9)
Electricity, wherein, described electric discharge at least one times is the barrier discharge of medium, in order to described in producing extremely
Once discharge less
A) between at least one first electrode (2a) and still moist described paper web face (9),
Or
B) at the first electrode (2a) at least one described with between at least one the second electrode (2b)
Apply voltage, and utilize electrolyte (22) at least to cover at least one described first electrode
(2a)。
Method the most according to claim 1, it is characterised in that fourdrinier machine or tool
Discharge at least one times described in carrying out in having the wet end (26) of the paper machine of Aladdin former.
3. according to method in any one of the preceding claims wherein, it is characterised in that moist is described
Paper web face (9) has the moisture in the range of at least 75%.
Method the most according to claim 3, it is characterised in that moist described paper web face (9)
There is the moisture in the range of 80 to 90%.
Method the most according to claim 1, it is characterised in that in the case of b), moist
Described paper web face (9) be directed through comprise described first electrode and described second electrode (2a,
Electrode 2b) is arranged, wherein, and described first electrode and described second electrode (2a, 2b)
It is arranged on the different side of described paper web face (9).
6. according to the method according to any one of claim 1 or 5, it is characterised in that described voltage
It it is the frequency alternating current in the range of 1kV to 30kV in the range of 1Hz to 500kHz
Pressure.
Method the most according to claim 6, it is characterised in that described voltage have sine,
Rectangle, triangle, jagged, the trapezoidal or change curve of impulse form.
Method the most according to claim 1 or 5, it is characterised in that at least one electrode and institute
State paper web face (9) to arrange with the spacing in the range of 1 to 100mm.
Method the most according to claim 6, it is characterised in that at least one electrode and described paper
Breadth (9) is arranged with the spacing in the range of 1 to 100mm.
Method the most according to claim 7, it is characterised in that at least one electrode and described paper
Breadth (9) is arranged with the spacing in the range of 1 to 100mm.
11. methods according to claim 10, it is characterised in that at least one electrode and described paper
Breadth (9) is arranged with the spacing in the range of 2 to 50mm.
12. methods according to claim 10, it is characterised in that at least one electrode and described paper
Breadth (9) is arranged with the spacing in the range of 2 to 10mm.
13. 1 kinds of paper machines (7), described paper machine has for changing in paper web face (9) for manufacture
The device (1) of shaping of paper fiber (3), wherein, the fibre in described paper web face (9)
Dimension orientation and fiber are distributed the local action of the pressure wave by being triggered by shelf depreciation described
Changing in the wet zone of paper machine (7), wherein, described paper machine includes having at least one
The electrode of electrode (2a, 2b) is arranged, wherein, by described paper fiber (3) constituted
Aqueous suspension is applied to the upper moist paper web face (9) shaped of screen cloth (6) can be described
Electrode arranges other being directed through so that described paper web face is by air gap and at least one electricity described
(2a, 2b) separates in pole, and described paper machine includes for arranging at described electrode
Between at least one first electrode (2a) and still moist described paper web face (9) or
At least one first electrode (2a) described of described electrode layout and at least one the second electrode
(2b) alive connecting line (4) is executed between, for producing through moist described paper web
Face (9) and/or the electric discharge at least one times on the surface from described paper web face (9), its
In, utilize electrolyte (22) at least to cover at least one first electrode (2a) and described
The thickness of electrolyte (22) is selected as preventing from puncturing described electrolyte (22).
14. paper machines according to claim 13 (7), it is characterised in that described electrode (2)
The whole width being arranged in described paper web face (9) on extend.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102011090121.3 | 2011-12-29 | ||
| DE201110090121 DE102011090121A1 (en) | 2011-12-29 | 2011-12-29 | Change a formation of paper fibers in a paper web |
| PCT/EP2012/076260 WO2013098170A1 (en) | 2011-12-29 | 2012-12-20 | Method and device for modifying the formation of a paper web |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104246065A CN104246065A (en) | 2014-12-24 |
| CN104246065B true CN104246065B (en) | 2016-08-31 |
Family
ID=47557071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201280065313.4A Active CN104246065B (en) | 2011-12-29 | 2012-12-20 | For the method and apparatus changing the formation in paper web face |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2773813B1 (en) |
| CN (1) | CN104246065B (en) |
| DE (1) | DE102011090121A1 (en) |
| WO (1) | WO2013098170A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5262208A (en) * | 1992-04-06 | 1993-11-16 | Plasma Plus | Gas plasma treatment for archival preservation of manuscripts and the like |
| DE19836669A1 (en) * | 1998-08-13 | 2000-02-24 | Kuesters Eduard Maschf | Preparation of the surface of a paper or cardboard web for calendering or printing comprises treating with an atmospheric plasma |
| CN1500938A (en) * | 2002-11-13 | 2004-06-02 | 黄金富 | Paper modified in plasma environment |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004101891A1 (en) * | 2003-05-13 | 2004-11-25 | Universitá Degli Studi Di Milano-Bicocca | Method for plasma treating paper and cardboards |
| PL1896654T3 (en) * | 2005-06-16 | 2009-04-30 | Siemens Ag | Sieve mechanism for the production of paper, and method for the treatment of nonwoven fibers |
| DE102005049290A1 (en) * | 2005-06-16 | 2006-12-28 | Siemens Ag | Pressing device for compacting paper and / or for removing carrier liquid from paper and method for this purpose |
-
2011
- 2011-12-29 DE DE201110090121 patent/DE102011090121A1/en not_active Withdrawn
-
2012
- 2012-12-20 WO PCT/EP2012/076260 patent/WO2013098170A1/en active Application Filing
- 2012-12-20 EP EP12813828.6A patent/EP2773813B1/en active Active
- 2012-12-20 CN CN201280065313.4A patent/CN104246065B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5262208A (en) * | 1992-04-06 | 1993-11-16 | Plasma Plus | Gas plasma treatment for archival preservation of manuscripts and the like |
| DE19836669A1 (en) * | 1998-08-13 | 2000-02-24 | Kuesters Eduard Maschf | Preparation of the surface of a paper or cardboard web for calendering or printing comprises treating with an atmospheric plasma |
| CN1500938A (en) * | 2002-11-13 | 2004-06-02 | 黄金富 | Paper modified in plasma environment |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102011090121A1 (en) | 2013-07-04 |
| EP2773813A1 (en) | 2014-09-10 |
| WO2013098170A1 (en) | 2013-07-04 |
| EP2773813B1 (en) | 2015-09-30 |
| CN104246065A (en) | 2014-12-24 |
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Effective date of registration: 20211202 Address after: Munich, Germany Patentee after: Siemens Energy International Address before: Munich, Germany Patentee before: SIEMENS AG |
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