CN104246065A - Method and device for modifying the formation of a paper web - Google Patents
Method and device for modifying the formation of a paper web Download PDFInfo
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- CN104246065A CN104246065A CN201280065313.4A CN201280065313A CN104246065A CN 104246065 A CN104246065 A CN 104246065A CN 201280065313 A CN201280065313 A CN 201280065313A CN 104246065 A CN104246065 A CN 104246065A
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- paper web
- web face
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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 invention relates to a method and a device for modifying the orientation of paper fibres (3) in a paper web, as well as to a paper machine which comprises such a device. A paper web which is still damp is formed by applying an aqueous suspension of paper fibres (3) onto a wire, and at least one electrical discharge is generated through this still-damp paper web, and/or generated such that it emanates from the surface of said paper web (9).
Description
Technical field
The present invention relates to a kind of method of the formation for changing the paper fiber in paper web face, a kind of device for implementing this method and a kind of paper machine with this device.
Background technology
An important flow process during paper sheet formation is papermaking.Make to be evenly distributed in suspension on paper web face width degree, that be made up of paper fiber, auxiliary material and water as far as possible for this reason and flow to paper sheet formation device, the screen cloth part of such as industrial sheet making machine.Such as in fourdrinier machine, fibrous suspension endless around screen cloth on flow.
The quality of paper forms decision by so-called in addition, namely the layout of fiber in paper, orientation and distribution.Usually, due to layout and the high screen cloth speed of the screen cloth in industrial sheet making machine, the paper fiber major part of paper, all along the direction of motion of screen cloth, makes the attribute of paper, such as tensile strength or longitudinal ductility, longitudinally to very large transverse to difference in two principal directions in paper web face.Longitudinally to transverse in two principal directions in paper web face, there is similar attribute in order to allow paper web face, paper is such as allowed to obtain higher tensile strength on the direction transverse to paper web face, just must to allow than more fiber so far transverse to the direction of motion of screen cloth, allow fiber basic isotropy ground orientation in other words.
Also may there is flocculation (Flockenbildung) when paper sheet formation, that is formed in sheet formation and there is the higher position of fiber intensity, i.e. so-called wadding, and formation have the lower position of fiber intensity.Thus adverse influence is produced to the outward appearance of paper, flatness and intensity.In order to realize the improvement in formation, flocculation must be avoided at the very start, or must first the wadding of formation be decomposed again at screen cloth part or destroy, thus allowing fiber be more evenly distributed.
What attempt up to now is by adjusting different procedure parameters, such as adjust dump angle on screen cloth of the volume velocity poured into by suspension on screen cloth, suspension and screen cloth speed, not only affect orientation and the distribution of fiber in paper, also affect the dehydration in the so-called in other words wet end on screen cloth.But formation is determined by different parameters, these parameters can only can be affected by traditional paper process under certain conditions.
Summary of the invention
Therefore, the object of the invention is to improve the formation in paper web face.
This object is solved by the method for the formation for changing the paper fiber in paper web face, wherein, forming still moist paper web face by being applied to by the aqueous suspension of paper fiber on screen cloth, passing still moist paper web face and/or producing from the surface in paper web face and discharging at least one times.In addition, this object is also solved by a kind of device of the formation for changing the paper fiber in paper web face, this device comprises the arrangement of electrodes with at least one electrode, wherein, the aqueous suspension of paper fiber can be guided through be applied to screen cloth is formed, still moist paper web face is through this arrangement of electrodes, paper web face is opened by air gap and at least one electrode separation, and comprise for executing alive connecting line in arrangement of electrodes between at least one the first electrode and paper web face or between at least one first electrode and at least one the second electrode of arrangement of electrodes, for discharging at least one times through paper web face and/or from the surface generation in paper web face.And this object is also solved by the paper machine had according to claim 11 to the device according to any one of 14.
The invention describes a kind of method innovation, it passes through utilization at the rest point of production process or in the improvement being about to carry out during rest point or at the end of rest point just electric discharge realization formation.When fiber no longer can move freely in fibrous suspension, but when being fixed on screen cloth, rest point of having arrived." formation " this concept not only comprises the distribution of paper fiber in paper web face at this, also comprises the orientation of fiber, that is its orientation.Basic concept of the present invention is that the pressure wave by applying partly to be caused by shelf depreciation in the wet district of papermaking changes or impact is formed, the fiber-wall-element model namely in paper and distribution.Pressure wave round certain discharge channel or electric discharge basic point (Fu β punkt) is utilized in fibrage or paper web face, bring energy into partly, thus again decompose thus or destroy the wadding formed, therefore distributing more uniformly of fiber is realized, and from side extruded paper fiber, therefore the orientation of fiber has statistically stronger.Fiber limitedly (that is in certain scope) elastic recovery makes the region of discharge channel substantially again close, thus can not stay in paper web face because discharge the hole of causing.
The present invention realizes by using electric discharge during paper-making process the improvement formed, the namely distribution of paper fiber, particularly cellulose fibre and orientation in paper web face.Particularly can be realized the paper web face of better quality with regard to being formed by this new method.Improve the outward appearance of paper, flatness and intensity thus.Therefore can not only realize the optimization production procedure that substandard products are less, the product of better quality can also be produced, the profit that can reach also may be allowed higher.
Favourable structural scheme of the present invention and improvement project draw by dependent claims.Wherein, can also improve according to method of the present invention according to the independent claims of relative assembly, vice versa.
According to a kind of favourable improvement project of the present invention, described electric discharge is at least one times medium barrier discharge.Electric discharge is preferably advised under atmospheric pressure carrying out medium barrier discharge (DBE).Medium barrier discharge (English: Dielectric Barrier Discharge, DBD) is also known with " silent discharge " this title.It is a kind of gas discharge.
According to the present invention, discharging at least one times to produce, voltage is applied 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.
At this, it is favourable for utilizing dielectric at least to cover at least one first electrode.This makes dielectric barrier electric discharge can occur in the air gap between at least one electrode and paper web face or between two electrodes.Preferably, dielectric layer and electrode are permanently connected.
Wherein, when b) preferably, guide moist paper web face through the arrangement of electrodes comprising the first and second electrodes, wherein, the first and second arrangement of electrodes are on the different side in paper web face.In addition advantageously, when this device has the layout of at least two electrodes, wherein, the dielectric that " potential barrier " that on the opposite side (discharging between them) in paper web face two mutually corresponding electrodes have at least an electrode to scribble to play insulation acts on is arranged in.
According to a kind of favourable improvement project of the present invention, moist paper web face is guided through the layout comprising at least two electrodes, this layout preferably comprises the first and second electrodes, wherein, every side in paper web face all arranges at least one electrode, preferably, the first and second arrangement of electrodes are on the not ipsilateral in paper web face.Wherein, be applied for producing the voltage discharged at least one times between the electrode on the opposite side in paper web face.
Only there is one scribble in the embodiment of dielectric electrode a kind of, what this electrode was preferably only positioned at paper web face is directed through on the side of this electrode with corresponding feeding speed, wherein, when applying sufficiently high voltage, between electrode surface and paper web face, DBE is produced.
If one of them utilizing dielectric to cover in two electrodes is individual, electric discharge that is direct, heavy current so just can not be formed between two electrodes.When realizing sufficiently high voltage in-between the electrodes, wherein an electrode and with it corresponding, by that complete weak current in the gas compartment between the electrode of dielectric barrier, high localized gas discharge; Make dielectric charge partly thus, voltage is declined again, and electric discharge terminates automatically.This process is called as medium barrier discharge.The feature of this electric discharge is that electric discharge starting point is being less than 1cm usually
2potential barrier on, and discharge channel diameter is under atmospheric pressure tens microns.
The preferred structural scheme of one according to the present invention, carries out at least single step of releasing electricity through paper web face still moist in the wet end of paper machine.In wet end, the pliability of the paper fiber in paper web face is still inadequate, so the power that pressure wave that is smaller, that cause due to shelf depreciation can be utilized to produce realizes reorientation, namely changes orientation.Particularly preferably be at this, the method is implemented in certain specific region, the electrode for generation of electric discharge is arranged in other words in certain specific region, namely, in this region, moist paper web mask has at least 20%, and preferably at least 75%, the moisture more preferably between 80 to 90%.
If form paper web face on fourdrinier machine, so preferably also directly discharge after screen cloth comes off on screen cloth or in the paper web face of humidity.But, as long as paper is still enough moist, also can discharge again a bit evening.According to the kind of machine type and paper, paper web face, at the end of screen cloth part, namely being about to the place arriving press section, has the moisture of about 75% to 80%.The method also can be used in the paper machine with other the paper sheet formation system being different from long screen cloth, such as, be used in and have in the paper machine of Aladdin former.Preferably, when having the paper machine of Aladdin former, discharge in certain specific region of screen cloth part, in this region, paper web face only has its bottom side to be guided by screen cloth, and its upside (as in long screen cloth) " being exposed ".
Preferably, this voltage is the alternating voltage in 1kV to 30kV scope.Preferably, this alternating voltage has in the scope of 1Hz to 500kHz, but the frequency particularly in the scope of 10Hz to 50kHz.In addition preferably, this voltage has change curve that is sinusoidal, rectangle, leg-of-mutton, jagged, trapezoidal or impulse form.In order to manufacture barrier discharge, needing several kilowatts (kV) to the alternating voltage of tens kilowatts (being usually less than 30kV), determining according to electrode spacing, air pressure and air humidity, gas composition etc.Preferably provide high pressure with the frequency of tens hertz to several ten thousand hertz.Also can be leg-of-mutton voltage change curve, or perhaps in described voltage and frequency range, the voltage that applies in the form of a pulse with corresponding repetition rate.
The preferred structural scheme of one according to the present invention, the value of the air gap between paper web face and electrode, in the scope of 1 to 100mm, preferably in the scope of 2 to 50mm, is more preferably in the scope of 2 to 10mm.Usually paper web face is supported, until the cross-connecting area of press section and drying section at screen cloth part by screen cloth or press felt.Paper web face and the screen cloth carrying out supporting usually can not be stable mobile on identical height exactly, but mechanical oscillation occur.The air gap selected preferably is greater than the amplitude of these mechanical oscillation.
According to the preferred structural scheme of one, select dielectric thickness, make it possible to prevent from puncturing this dielectric.There are pottery, glass, glass ceramics for dielectric suitable material, or also can use plastics.Wherein, the numerical value of dielectric relative dielectric constant can at about 2 (such as glass, plastics) to more than 10 between (such as aluminium oxide ceramics), or also can be several thousand (such as barium titanates).Select dielectric thickness, make the total voltage up to several kilovolts that must apply can not cause puncturing in dielectric; Therefore, according to Material selec-tion thickness, but thickness is preferably thin as far as possible.
According to the preferred structural scheme of one, the layout of electrode extends on the whole width in paper web face.Can realize on the width in whole paper web face and in the corresponding part of paper web face lengthwise, producing very many discharge channels by large-area electrode bar simultaneously.Then, plasma power corresponding high time, just can rearrange most fiber statistically, thus realize when relating to whole paper web face on the whole fiber reset.Can targetedly by the intensity of controlled plasma power impact effect at this.Even if under atmospheric pressure also this medium barrier discharge can be carried out to scale on very large area, even if also good flow monitoring can be realized when the translational speed of paper is very fast and paper web face is very wide thus.
Accompanying drawing explanation
In conjunction with below can be clearer and more clearly understand above-mentioned feature of the present invention, feature and advantage to the description of the embodiment of elaboration by reference to the accompanying drawings, and realize mode and the method for these feature and advantage.In figure respectively schematically and not to scale (NTS) illustrate:
Fig. 1 shows in the process of the method for the formation for changing paper fiber, the situation of change of the orientation of the fiber in paper web face;
Fig. 2 shows in the process of the method for the formation for changing paper fiber, the situation of change of the fiber distribution in paper web face;
Fig. 3 shows the outside drawing of electrode pair relative to paper web face;
Fig. 4 shows the sectional view of the first arrangement of electrodes;
Fig. 5 shows the sectional view of another arrangement of electrodes;
Fig. 6 profile shows a part for paper machine; And
Fig. 7 outside drawing shows paper machine.
Detailed description of the invention
Fig. 1 comprises subgraph 1a to 1c, there is illustrated the whole order of fiber-wall-element model, and they are fibrolaminar amplification plan views in that be shaped, still moist paper web face.When this order explanation is the device of formation passed in paper web face for changing paper fiber in paper web face, the change of the orientation of the fiber 3 in paper web face.
Fig. 1 a shows a kind of initial state, and wherein, the main orientation of the paper fiber 3 in fibrage just is in formation along screen movement direction 21.This significantly each initial state to the not fiber-wall-element model of the same sex is normally formed because of the layout of the screen cloth in industrial sheet making machine and high screen cloth speed.The original orientation of fiber 3 is along screen movement direction 21, as it by providing under the fibrous material condition of batching on the screen cloth of motion on screen movement direction 21.
Fig. 1 b shows the state formed after the fibrage just passing that formed, moist paper web face along discharge channel discharges.The fiber 3 that be arranged in fibrage of atmospheric pressure Reeb to paper web face generated by electric discharge applies power.According to the firmness that fiber 3 is arranged in fibrage, pressure wave or fiber can be passed on whole lengthwise, and it is outwards extruded from discharge channel 8, or only on a part of lengthwise, acts on fiber 3, and only one of fiber 3 section is gone from discharge channel 8 is extrapolated.Make fiber 3 adjustment direction and/or bending discriminatively by this way.From the globality of fiber 3, electric discharge causes the orientation of the paper fiber 3 in the subregion of wave action that is stressed in still moist paper web face that significant change occurs.
Fig. 1 c shows the state after a period of time after electric discharge.In electric discharge after a period of time, usually in several seconds, elastic-restoring force starts to work, and it makes individuals fibers 3 or also can only make some sections of individuals fibers reply position, namely recovers at least in part because the direction that pressure wave causes adjusts and/or bends.By this way, those are got back in discharge channel 8 at least in part again at (as in Figure 1b) fiber be only arranged in beyond discharge channel 8 after just discharging.That is, the region of limited, namely in certain limitation the elastic recovery guiding discharge passage 8 of fiber is closed substantially again, thus in paper web face not leaving pore.
Fiber 3 in figure 1 c shown in state of orientation substantially remain unchanged, and paper web face still proceeds the immediately process step thereafter of paper machine.Through after whole paper machine, because the fiber condition of reorientation of discharging substantially remains unchanged in finished paper.
Fig. 2 comprises subgraph 2a to 2c, there is illustrated the whole order of processbearing astrocyte distribution, and they are that orientation is shaped, certain fibrolaminar amplification plan view in still moist paper web face.When this order explanation is the device of formation passed in paper web face for changing paper fiber in paper web face, the change of the distribution of the fiber 3 in paper web face.
Fig. 2 a shows a kind of initial state, wherein, forms wadding 30 in the fibrage of paper fiber.
Fig. 2 b shows the state formed after the fibrage just passing that formed, moist paper web face along discharge channel 8 discharges.Because the fiber 3 of the atmospheric pressure wave direction wadding 30 of electric discharge generation applies power.Pressure pulse formula impels fiber to be separated from each other, and makes wadding and agglomerate decompose or at least obviously reduce.According to the firmness that fiber 3 is arranged in fibrage, fiber can be passed by pressure wave on whole lengthwise, and by its from discharge channel 8 to extrusion, or only on a part of lengthwise, act on fiber 3, and only one of fiber 3 section gone from discharge channel 8 is extrapolated.Make fiber 3 adjustment direction and/or bending discriminatively by this way.From the globality of fiber 3, electric discharge causes the distribution of the paper fiber 3 in the subregion of wave action that is stressed in still moist paper web face that significant change occurs.
Fig. 2 c shows the state after a period of time after discharge.In electric discharge after a period of time, usually in several seconds, elastic-restoring force starts to work, and it makes individuals fibers 3 or also can only make some sections of individuals fibers reply position, namely recovers at least in part because the direction that pressure wave causes adjusts and/or bends.By this way, those are got back in discharge channel 8 at least in part again at (as in figure 2b) fiber be only arranged in beyond discharge channel 8 after just discharging.That is, the region of limited, namely in certain limitation the elastic recovery guiding discharge passage 8 of fiber is closed substantially again, thus in paper web face not leaving pore.
Fiber 3 in figure 2 c shown in state of orientation substantially remain unchanged, and paper web face still proceeds the immediately process step thereafter of paper machine.By through whole paper machine, the fiber condition due to reorientation of discharging substantially is remained unchanged in finished paper.
For the sake of clarity, separately observe electric discharge in fig 1 and 2 to the impact formed, i.e. the change of orientation/orientation of fiber and the change of distribution.But self-evidently, in fact two effects be occur simultaneously 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, and wherein, this device 1 has the electrode pair 2a relative to paper web face 9,2b.The electrode 2a of top is coated with the dielectric 22 of dielectric layer form on the side in its orientation paper web face.The distance values in electrode 2a, 2b and paper web face 9, respectively in the scope of 2 to 10mm, makes electrode 2a, forms a uniform air gap between 2b and paper web face 9 respectively, can transport still moist paper web face 9 through these air gaps by registration rollers 12.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, thus at electrode 2a, can apply voltage between 2b.
Advantageously, two electrode 2a, 2b are configured to the form one-tenth of electrode bar.Electrode bar comprise many that be arranged side by side in a plane, for the manufacture of the single electrode of discharge channel.On the basis of multiple discharge channels that can manufacture on the width in paper web face, uniform fiber-wall-element model and fiber distribution can be realized in all regions in paper web face 9.
Select the height of voltage as follows, that is, make electrode pair 2a, the whole of the air gap between 2b transversely occurs at least one times through the electric discharge in paper web face 9.Surrounding air preferably by paper web face 9 completes electric discharge, i.e. gas discharge.Caused the reorientation of fiber along each discharge channel by the pressure wave along with electric discharge generation.The scope of fiber reorientation or efficiency also depend on electrode 2a, the quantity of electric charge (discharge channel) of the spacing (width of air gap) between 2b, air pressure, air humidity, air composition, each filament (Fliament_), the voltage, each filametntary active region etc. of applying.
When only using one to have an electrode of dielectric coating, select voltage as follows, that is, make in the air gap between paper web face 9 and this electrode, to form dielectric barrier electric discharge.Select the size of this air gap at this respectively as follows, that is, make, when mechanical oscillation appear in paper web face, not come in contact between paper web face and electrode.
Next the rough estimate of power consumption that can be used for when papermaking improveing the medium barrier discharge formed is shown.Here basic concept is, energy content limited, the discharge channel (so-called filament) of high localized in barrier discharge, dispersion is for the mobile and/or curved fiber by the local pressure ripple (effect of similar cavitation bubble) of barrier discharge.The assumed condition summed up in Table 1 is the basis carrying out estimating: 1mm
2
Table 1
Therefrom calculate the minimum of a value of concrete energy requirement E/A (ENERGY E of unit are A):
E/A＝1nC*10kV/1mm
2＝10
-9As*10
4V/10
-6m
2＝10J/m
2
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*20m
2/ s=180m
2/ s, in order to produce the minimum power P that plasma needs in theory
plasmafor
P
plasma＝10J/m
2*180m
2/s＝1.8kW
Frequency is now a few KHz, and this easily realizes technically, because this is the exemplary power scope of little current transformer.Extra electrical loss is not considered in this rough estimate.
This means, utilize several kilowatts (if the pressure wave scope estimated is less than the scope of hypothesis, maximum tens kilowatts) power in scope can implement such flow process economically, in addition, the intensity of paper can also promote, because create atomic group during DBD with the form forming hydrogen bond extraly.
Fig. 4 shows the cut-away view of the first arrangement of electrodes, and the first arrangement of electrodes is equal to the arrangement of electrodes shown in Fig. 3 substantially.The paper web face 9 formed by the still moist fibrage of paper fiber is supported by screen cloth 6, and is transmitted on the traffic direction 21 of screen cloth by it.The upside in paper web face 9 is arranged the first electrode 2a covering dielectric layer 22, the downside in paper web face 9 arranges the second electrode 2b.Electrode 2a, 2b and paper web face 9 are spaced from each other respectively by air gap d.Electrode is electrically connected with voltage source 5 by conductor rail 4.At electrode 2a, when being applied with sufficiently high voltage between 2b, discharge through paper web face.In order to not cause adverse influence to electric discharge, screen cloth is made up of non electrically conductive material, such as, be made up of plastics.
The the first electrode 2a be arranged on paper web face 9 can maintain static, or is formed using the form of roller or as abutting in band on paper web face 9, that be made up of the material conducted electricity (such as metal tape), and it moves with the speed that screen cloth 6 is the same.As the replacement of the second electrode 2b that position is fixed, the second electrode 2b be arranged in below paper web face 9 is configured to abut in band on screen cloth 6, that be made up of conductive material (such as metal tape) and forms, and it moves with the speed that screen cloth 6 is the same.
Fig. 5 shows the cut-away view of arrangement of electrodes instead.The paper web face 9 be made up of the still moist paper fiber of paper fiber is supported by the screen cloth 6 of movement automatically, and is transmitted on the traffic direction 21 of screen cloth by it.The upside in paper web face 9 is arranged the first electrode 2a covering dielectric layer 22.The screen cloth be made up of conductive material is electrically connected with voltage source 4 by conductor rail 4, such as, contacted by sliding friction.Here screen cloth can be made up of the metal as copper or smart steel, or is made up of the plastics containing conductive element (such as metallic element).Therefore, screen cloth forms the second electrode.First electrode 2a and paper web face 9 are separated mutually by the air gap with width of air gap d.First electrode 2a is electrically connected with voltage source 5 by conductor rail 4.In the sufficiently high situation of voltage applied between the first electrode 2a and screen cloth 6, discharge through paper web face and/or from the surface in paper web face 9.
Due to the high electric conductivity that the moisture in still moist paper web face causes, paper web face is connected conductively with screen cloth, and therefore itself is an electrode.Therefore, in the sufficiently high situation of voltage applied between the first electrode 2a and screen cloth 6, also can occur once to discharge, particularly from the electric discharge on the surface in paper web face 9 between the first electrode 2a and paper web face 9.
Fig. 6 profile shows material batching apparatus 20 and the screen cloth part 10 of paper machine.In material batching apparatus 20.The fibrous suspension be made up of paper fiber, auxiliary material and water by profiled sheeting 11 come endless around screen cloth 6 on.Then, suspension on the traffic direction 21 of screen cloth through the following assembly of screen cloth part 10: register roller (Registerwalze) 12, first moisture absorption case 13a, monofilm 14, second moisture absorption case 13b, dandy roll 19, suction box 15.Roll in the region of 17 in screen cloth part water suction, the paper web face be made up of fibrous suspension during this period comes off from screen cloth 6, and runs towards the press section of paper machine.By screen cloth driven roller 18 and breast roll 16, the screen cloth of sky is transmitted back to screen cloth platform (Siebtisch) 11.
The following flow process of the theoretical description of paper sheet formation: once fibrous suspension contacts with screen cloth 6, just promote paper fiber by the flow resistance of paper fiber on screen cloth 6.Make thus to start to form fibrage on screen cloth, fibrage constantly increases.According to the freedom of motion of fiber in suspension, there are two kinds of multi-form paper sheet formations: to filter and concentrated.As can be seen from the formation of most of paper, accounting for leading is filter: when dewatering, the fibrage (i.e. so-called fiber mat) that screen cloth has been formed and form obvious transition between the suspension of top.Material concentration during fluid stage is almost constant, and these fibers can move freely each other.
Paper fiber in fibrage is exposed in the electric discharge between electrode 2, paper fiber now all in the wet end region of paper machine, such as, in screen cloth part 10 region.Possiblely in this process be, device 1 for changing the paper fiber-wall-element model in paper web face comprises two electrodes 2, they are arranged in the upper and lower of screen cloth 6, such as, in the region between two moisture absorption case 13b and dandy roll 19, just as shown in FIG. 6.
Fig. 7 outside drawing shows paper machine 7, and material batching apparatus 20 and screen cloth part 10 are positioned at the part on its left side.In the region of couch roll squeezing (Gautschpresse) 28, the paper web face 9 formed by fibrous suspension during this period comes off from screen cloth 6, and the traffic direction 21 and then towards screen cloth enters wet pressing area 23, it presses wet felt 24 to still moist paper web face 9.The later process step of paper machine 7 comprises a series of drying cylinder 25, and they are by using the further dry-web face 9 of heat energy.Can distinguish wet end 26 and drying section 27 in paper machine 7 in principle, their boundary is determined by the moisture in paper web face 9 substantially.In the figure 7, wet end 26 approximately extends to the end using wet felt 24.
By arranging the device of the orientation for changing paper fiber in paper web face in wet end 26, can by the optimized orientation utilizing the pressure wave caused by discharging to realize cellulose fibre.
Generally speaking what was certain was that, the present invention relates to a kind of method and apparatus of the orientation for changing the paper fiber in paper web face, and a kind of paper machine with this device.Be poured on screen cloth by the waterborne suspension that paper fiber is formed and define still moist paper web face.Manufacture through still moist paper web face and discharge at least one times.
Although at large set forth by preferred embodiment and describe details of the present invention, the present invention is not subject to the limitation of disclosed example, and professional and technical personnel therefrom can derive other change programme, and does not leave protection scope of the present invention.
Claims (15)
1. one kind for changing the method for the formation of the paper fiber (3) in paper web face (9), wherein, produce and be applied to the upper still moist described paper web face (9) formed of screen cloth (6) through the waterborne suspension described paper fiber (3) formed, and/or the electric discharge at least one times on surface from described paper web face (9).
2. method according to claim 1, is characterized in that, described electric discharge is at least one times the barrier discharge of medium.
3. method according to claim 1 and 2, is characterized in that, fourdrinier machine (7) or the paper machine (7) with Aladdin former wet end (26) in carry out described in discharge at least one times.
4. according to method in any one of the preceding claims wherein, it is characterized in that, moist described paper web face (9) has at least 20%, and preferably at least 75%, the moisture more preferably in the scope of 80 to 90%.
5. according to method in any one of the preceding claims wherein, it is characterized in that, discharge at least one times described in producing
A) between at least one first electrode (2a) and still moist described paper web face (9), or
B) described at least one, voltage is applied between the first electrode (2a) and at least one the second electrode (2b).
6. method according to claim 5, it is characterized in that, when b), moist described paper web face (9) is directed through and comprises described first and described second electrode (2a, arrangement of electrodes 2b), wherein, described first and described second electrode (2a, 2b) be arranged on the different side of described paper web face (9).
7. the method according to claim 5 or 6, is characterized in that, utilizes dielectric (22) at least to cover at least one first electrode (2a) described.
8. the method according to any one of claim 5 to 7, is characterized in that, described voltage is the alternating voltage 1kV to 30kV scope in of frequency in 1Hz to 500kHz scope.
9. method according to claim 8, is characterized in that, described voltage has change curve that is sinusoidal, rectangle, leg-of-mutton, jagged, trapezoidal or impulse form.
10. the method according to any one of claim 5 to 9, it is characterized in that, at least one electrode and described paper web face (9) with in the scope of 1 to 100mm, in the scope of preferably 2 to 50mm, spacing (d) more preferably in the scope of 2 to 10mm arranges.
11. 1 kinds for changing the device (1) of the formation of the paper fiber (3) in paper web face (9), described device comprises and has at least one electrode (2a, arrangement of electrodes 2b), it can be directed through on described arrangement of electrodes side by the paper web face (9) aqueous suspension that described paper fiber (3) is formed being applied to the upper humidity formed of screen cloth (6), make described paper web face by air gap (d) and described at least one electrode (2a, 2b) separate, and described device comprises between at least one first electrode (2a) and still moist described paper web face (9) of described arrangement of electrodes or executing alive connecting line (4) between at least one first electrode (2a) and at least one the second electrode (2b) described in described arrangement of electrodes, for generation of the electric discharge at least one times through moist described paper web face (9) and/or the surface from described paper web face (9).
12. devices according to claim 11 (1), it is characterized in that, utilize dielectric (22) covering to be arranged at least one electrode (2) of two mutual corresponding electrodes (2) on the opposite side of described paper web face (9), discharge between the side that described paper web face is opposite.
13. devices according to claim 12 (1), is characterized in that, the thickness of described dielectric (22) is selected as preventing from puncturing described dielectric (22).
14., according to claim 11 to the device (1) according to any one of 13, is characterized in that, the whole width being arranged in described paper web face (9) of described electrode (2) extends.
15. 1 kinds of paper machines (7), have according to claim 11 to the device (1) according to any one of 14.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE201110090121 DE102011090121A1 (en) | 2011-12-29 | 2011-12-29 | Change a formation of paper fibers in a paper web |
| DE102011090121.3 | 2011-12-29 | ||
| 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 true CN104246065A (en) | 2014-12-24 |
| CN104246065B CN104246065B (en) | 2016-08-31 |
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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 (5)
| 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 |
| WO2004101891A1 (en) * | 2003-05-13 | 2004-11-25 | Universitá Degli Studi Di Milano-Bicocca | Method for plasma treating paper and cardboards |
| WO2006134069A1 (en) * | 2005-06-16 | 2006-12-21 | Siemens Aktiengesellschaft | Sieve mechanism for the production of paper, and method for the treatment of nonwoven fibers |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 EP EP12813828.6A patent/EP2773813B1/en active Active
- 2012-12-20 CN CN201280065313.4A patent/CN104246065B/en active Active
- 2012-12-20 WO PCT/EP2012/076260 patent/WO2013098170A1/en active Application Filing
Patent Citations (5)
| 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 |
| WO2004101891A1 (en) * | 2003-05-13 | 2004-11-25 | Universitá Degli Studi Di Milano-Bicocca | Method for plasma treating paper and cardboards |
| WO2006134069A1 (en) * | 2005-06-16 | 2006-12-21 | Siemens Aktiengesellschaft | Sieve mechanism for the production of paper, and method for the treatment of nonwoven fibers |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104246065B (en) | 2016-08-31 |
| DE102011090121A1 (en) | 2013-07-04 |
| EP2773813A1 (en) | 2014-09-10 |
| EP2773813B1 (en) | 2015-09-30 |
| WO2013098170A1 (en) | 2013-07-04 |
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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 |