CN102782214A - Headbox and sheet-forming unit comprising a headbox - Google Patents
Headbox and sheet-forming unit comprising a headbox Download PDFInfo
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- CN102782214A CN102782214A CN2011800084923A CN201180008492A CN102782214A CN 102782214 A CN102782214 A CN 102782214A CN 2011800084923 A CN2011800084923 A CN 2011800084923A CN 201180008492 A CN201180008492 A CN 201180008492A CN 102782214 A CN102782214 A CN 102782214A
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- turbulence
- passage
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- generation device
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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
- D21F1/02—Head boxes of Fourdrinier machines
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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
- D21F1/02—Head boxes of Fourdrinier machines
- D21F1/026—Details of the turbulence section
Abstract
The invention relates to a headbox (1) comprising at least one feeding device (5) feeding at least one fibrous material suspension (FS), a nozzle (4) having an outlet gap (11) for dispensing the fibrous material suspension (FS) in a free jet (F) and a turbulence-generating device (6) arranged directly upstream of the nozzle (4) in the flow direction. During operation of the headbox (1), the at least one fibrous material suspension (FS) is guided in partial flows through a plurality of turbulence-generating channels (7, 7.xy, 7.11 -7.4n), at least one region forming a fluidization region (12, 12.11 -12.31) being provided inside each individual turbulence-generating channel (7, 7.xy, 7.11 -7.4n). The headbox (1) according to the invention is characterized in that the total volume (VTE) of an individual turbulence-generating channel (7, 7.xy, 7.11 -7.4n), depending on the effective volume (VF) downstream of the fluidization region (12, 12.11 - 12.31) which is last in the direction of flow inside an individual turbulence-generating channel (7, 7.xy, 7.11 -7.4n) up to the outlet (6A) from the turbulence-generating device (6) is: VTE = k2 DEG VF, wherein VTE is the total volume of an individual turbulence-generating channel (7, 7.xy, 7.11 -7.4n), k2 is a constant, with 1 <= k2 <= 1,5; and VF is the effective volume of the turbulence-generating device (6) downstream of the fluidization region (12, 12.11 - 12.31).
Description
Technical field
The present invention relates to a kind of head box; Be used for using at the machine of being made fiber web, particularly paper web material, board web material or paper handkerchief width of cloth material by at least a fibrous substance suspension, comprising: at least one imports the input equipment of at least a fibrous substance suspension; Be used for discharging the nozzle with outlet gap of fibrous substance suspension and on flow direction, directly being prepended to the turbulence generation device of nozzle with free jet; At least a fibrous substance suspension can guide with shunting mode through a large amount of turbulence generation passages in this turbulence generation device; Wherein, the set inside at single turbulence generation passage has at least one to form the zone in fluidisation zone.
The present invention relates to a kind of page or leaf in addition and opens the formation unit, to the machine that is used to make fiber web, particularly paper web material, board web material or paper handkerchief width of cloth material, comprises head box and the forming unit that is placed on this head box.
Background technology
The quality of the fiber web that the density of material of fibrous substance suspension has been confirmed in the result of manufacture process, to occur fatefully.At this, has the shaping (Formation) that to observe the variation day by day of the description that can distribute through the both macro and micro of fiber and packing material under the situation of fibrous substance suspension of higher material density in use.But in order to obtain the gratifying result in view of the quality of fiber web, the fibrous substance suspension that adopts known head box will have in the scope of density of material from 0.8 to 1.0 percentage is at present introduced the rearmounted forming unit.Higher density of material causes being the shaping of thick cloud form because very strong fiber flocculates when jet is discharged by head box.
Therefore require to take following measure, these measures to be used to destroy this undesirable flocculation and in time make to flow to stablize.Target is on the outlet gap of head box, to provide the whole width of striding head box not have the fibrous substance suspension jet of flocculation as far as possible.Use dissimilar utensils for this reason, particularly produce turbulence and unit fluid power, they have usually and are used for the passage that better flows in a large number.These passages can implement dissimilarly and under the simplest situation through being of flow cross section stepped cross section change and characterize.The nozzle that connects with it generally has the length between 600 to 700mm, so that obtain enough jet stabilities.Circle round and sufficiently to be attenuated through this length in nozzle interior at this by what the grid wake flow produced.But thus to fibrous substance suspension time of staying of nozzle interior greater than flocculation time again, thereby cause flocculation again to form.In order to obtain the gratifying formed features value for fiber web to be constructed, should as far as possible fully avoid the fluidisation of in the end the carrying out flocculation again of fibrous substance suspension afterwards in head box.This needs the corresponding unit that makes up shortly.
The problem of the quality of the fiber web that flocculation formation and influence thereof produce in depth is described in document EP 1 313 912 B1.In order to address this problem; A kind of head box embodiment with alter mode of turbulence generation device is proposed; Only in a ladder, carry out the fluidisation in each turbulence produces passage through its inside once, realize acceleration of flowing and the time of staying of realizing the weak point of fibrous substance suspension in head box thus at the turbulence generation device.The fluidisation degree can keep through the particular design at the diaphragm of nozzle interior then.For this fluidisation, propose the formation fluidisation of single subregional length and cross-sectional area of flow channel of turbulence generation device regional be stepped change, these length draw the total length of turbulence generation device in aforementioned areas.
For the shaping of the fiber web that improves generation, known in addition a large amount of measures, these measures characterize through modification nozzle or the turbulence generation device.
Document DE 101 06 684 A1 disclose a kind of embodiment of head box; Have for fear of at the flow instability of nozzle interior and then avoid the membrane ends of the special enforcement of vibratory stimulation, it has the inclined-plane and is being provided with a kind of structure from this nozzle wall away from the side of pointing on the side of pointing to nozzle wall.
For the shaping of shadow in the sound nozzle interior, disclose as follows according to document DE 199 02 621 A1, that is, nozzle is configured with the zone of different geometries, is used for producing the different flows cross section in nozzle interior.
Document WO 2008/077585 A1 discloses the benefit through the structure of the design of the headbox nozzle of symmetric construction and these headbox nozzle and the symmetry characteristic of physical dimension on the Z direction.
Be used for describing to some extent at document EP 1 022 378 A2 through the measure that makes the orientation of fiber in the zone of discharging improve lateral stiffness by nozzle.The structure utilization of nozzle has the zone that lasting cross section dwindles and carry out in the zone that lasting cross section widens that has that connects with it.
In order when free jet is discharged by nozzle, to prevent that it from scattering; Document DE 297 13 433 U1 disclose the head box embodiment that has by the formed nozzle of boundary face that distributes on the machine-wide, and wherein at least one in these boundary faces characterizes through at least three sections with different convergencys.
Document DE 102 34 550 A1 disclose at page or leaf and have opened the embodiment that forms intrasystem head box, and wherein nozzle characterizes through the length greater than 400mm, and wherein, the length that is prepended to the turbulence generation device of this nozzle preferably is in this scope equally.
Disclosed measure is not enough to the higher material density at fibrous substance suspension, for example is higher than 1.0 percentages, particularly is higher than under the situation of 1.2 percentages, suppresses to reduce in other words flocculation again with desirable yardstick.
Summary of the invention
The present invention is based on following task; Promptly; In this wise further the said type of exploitation beginning be used for the head box that uses at the machine of making fiber web, particularly paper web material, board web material or paper handkerchief width of cloth material; That is, avoid shortcoming and the minimizing of being mentioned or be suppressed at the flocculation again of the fibrous substance suspension of back, last fluidisation zone.At this, under the situation that the jet quality remains unchanged, particularly fibrous root is according to reducing fibrous substance suspension in head box, particularly the time of staying in turbulence generation device and nozzle arranges.
Characterize according to the characteristic of solution of the present invention through independent claims 1 and 10.Favourable design is described in the dependent claims.
Be used under the situation of the head box that the machine of being made fiber web, particularly paper web material, board web material or paper handkerchief width of cloth material by at least a fibrous substance suspension uses according to of the present invention, this head box comprises: at least one imports the input equipment of at least a fibrous substance suspension; Be used for discharging the nozzle with outlet gap of fibrous substance suspension and on flow direction, directly being prepended to the turbulence generation device of nozzle with free jet; At least a fibrous substance suspension can produce passage to divide streamed guiding through a large amount of turbulences in this turbulence generation device; Wherein, Produce channel interior in single turbulence and be provided with the zone that at least one forms the fluidisation zone; The turbulence generation device is constructed in this wise, that is, the total measurement (volume) that single turbulence produces passage depends on this single turbulence and produces the through-flow volume until the outlet of turbulence generation device of passage ability the fluidisation zone last along through-flow direction after and be:
V
TE=k2·V
F
Wherein,
V
TESingle turbulence produces the total measurement (volume) of passage;
The k2 constant, 1≤k2≤2, preferred 1≤k2≤1.5; And
V
FThe turbulence generation device is through-flow volume after last fluidisation zone.
The fluidisation zone is meant following zone, in this zone, exists and contains the for example even distribution of the fibrous substance suspension of the part as fiber and packing material.This influence can be initiatively through the element in view of its interaction energy control at this; For example carry out as the static(al) mixing arrangement; Or the generation of the design of passive geometry through flow path and turbulence that cause thus, to the fibrous substance suspension, under the situation of dissolving aggregation, particularly flocculation, carry out.This zone can be limited in along on the line of cross-machine direction in observation on the through-flow direction partly, or extends ground along through-flow direction and implement.
Through the foundation adjustment of the present invention that total measurement (volume) and turbulence to turbulence generation passage produce the through-flow volume of passage ability after the fluidisation zone advantage of setting up very short passage is provided according to solution of the present invention, these passages of lacking very much obviously minimizing go to mix tendency.
According to particularly advantageous improvement project, also will produce the through-flow volume of channel interior ability the fluidisation zone last after and be optimized aspect the time of staying of the weak point of single shunting in single turbulence until the outlet of turbulence generation device along through-flow direction.The volume that this ability is through-flow produces the function of the area that open wide of passage in the outlet of turbulence generation device for this reason as single turbulence:
Wherein,
V
FThe turbulence generation device is through-flow volume after last fluidisation zone;
The k1 constant, 1≤k1≤10, preferred 3≤k1≤7; And
B
TOTurbulence produces the cross-sectional area that open wide of passage in the outlet of turbulence generation device.
Flocculate to reduce again through the little through-flow volume of treating after can being arranged on the fluidisation zone to the through-flow volume of the ability of turbulence generation passage with the adjustment that exports cross section, and fill the outlet cross section of single turbulence generation passage in the outlet of turbulence generation device on the other hand simultaneously best.In addition, the combination through these measures will produce channel interior the mobile area that carries out the wall of boundary is minimized in turbulence.
The structure that produces the geometry of volume that can be through-flow after last fluidisation zone in the passage in single turbulence can carry out dissimilarly, and particularly the shape of this volume can at random be selected with guide of flow relatively.According to the first favourable flexible program, produce the through-flow volume of channel interior ability the fluidisation zone last after in single turbulence and have at least one and have along the volume area of the constant flow cross section of through-flow direction until the outlet of turbulence generation device along through-flow direction.According to the second favourable flexible program, produce the through-flow volume of channel interior ability the fluidisation zone last after in single turbulence and have the volume area that at least one has the flow cross section that continues to increase or reduce along through-flow direction until the outlet of turbulence generation device along through-flow direction.Can each will make up each other according to the embodiment of the first or second favourable flexible program and/or will make up each other according to further the 3rd flexible program according to the embodiment of the first and second favourable flexible programs.Can consider that through the possibility of moulding arbitrarily other aspects also also can change and influence the length of volume that can be through-flow.
There is multiple possibility what realize the nozzle front aspect the pressure loss of the last fluidisation intra-zone of streamwise.At this, last fluidisation zone streamwise is observed can local strong boundary ground, or the ground structure is extended along through-flow direction in the subregion that produces passage through turbulence.The pressure loss can produce as the geometry of the flow path in single turbulence produces passage and/or the function of physical dimension under the simplest situation according to first flexible program passively, or through being provided for producing channel interior in turbulence additional device and/or the possibility that energy is input in the fibrous substance suspension is produced on one's own initiative.
In the fluidisation zone, the energy input is carried out under the situation that produces the pressure loss.This pressure loss can produce on all kinds ground.According to the particularly preferred embodiment of first flexible program that is used to produce the pressure loss, the stepped change that is of part that is produced the cross-sectional area of passage in the last fluidisation zone of the import front in nozzle along the through-flow direction observation place by single turbulence forms.The cross-sectional area of passage can be described through geometry and physical dimension.The advantage that being stepped change provides is, producing under the situation of very strong turbulence in order to break flocculation, in the zone of the local strong boundary of the inside of flow path, produces higher pressure change simply, improves fluidisation thus generally.The very high fiber activity of being adjusted thus is retained through the time of staying until the weak point of being discharged by nozzle that little volume of the present invention caused by foundation then.
In further second flexible program, can form along of the change that continue of through-flow direction observation place by the cross-sectional area of single turbulence generation passage in the last fluidisation zone of the import front in nozzle.From the size change of the cross-sectional area of cross-sectional area under the situation of stepped or lasting change of being of maximum cross section area of minimum, that can describe as the difference of the hydraulic diameter that characterizes cross-sectional area at this in order to produce required minimum pressure and to change and suitably selecting.
According to further the 3rd flexible program, pressure change can be additionally or the utensil that alternatively is used for the energy input through at least one static(al) mixing arrangement to be provided with in the fluidisation zone or at least one in fibrous substance suspension, produce under the situation of the desirable pressure loss and cause.The advantage that these possibilities provide is, with the free adjustable of the ability simple realization of the irrelevant pressure change of the geometry in turbulence produces passage.
In order in favourable improvement project, except the length of turbulence generation device, also to reduce the length and then the time of staying in this nozzle of nozzle; Nozzle is implemented in this wise; Promptly; This nozzle has following length, and this length is attached troops to a unit as the cross-sectional area of nozzle in the import in nozzle and produced function passage and the size part area of describing the division area to single turbulence:
Wherein,
The length of L nozzle;
K constant, wherein 10≤k≤20; And
B
TDivide area.
Nozzle length characterizes and measures perpendicular to the exit face of turbulence generation device through the spacing between the outlet gap of preposition turbulence generation device outlet and nozzle.
Be utilized in the relation between interior cross section of nozzle and the fluid power division targetedly according to solution of the present invention; Wherein, With foundation functional relation respective nozzles length structure of the present invention following advantage is provided; That is, be retained in the time of staying of the weak point of fibrous substance suspension in nozzle under the situation of the jet quality in the outlet of coming out at the same time by outlet gap.Produce the length of the division area adjustment nozzle of passage to single turbulence through attaching troops to a unit, fiber and packing material distribution and then the shaping in fibrous suspension optimized when fibrous substance suspension enters forming unit with free jet through avoiding fiber and packing material cohesion to obtain under the situation of attenuation that can be enough at the same time according to the cross-sectional area in the import in nozzle.
Dividing the qualification of area can carry out dissimilarly.According to the difference of embodiment, this confirms or is based on size and the structure of turbulence generation device on the nozzle, or individually based on the turbulence generation device.The size of single division area is confirmed through the amount formed merchant who is produced passage by the cross-sectional area of nozzle, the particularly size of the cross-sectional area in the import in nozzle and the single turbulence in directly being prepended to the turbulence generation device of nozzle according to particularly advantageous first embodiment.This qualification receives the influence of tolerance hardly.
In second embodiment, the size of single division area through single, have or form the cross-sectional area geometry of hydraulic power unit in the outlet of turbulence generation device that turbulence produces passage and confirm.Hydraulic power unit is meant that part independent or the total unit of conduct has or comprise the unit of single turbulence generation passage.This unit comprises that passage and at least one form the wall that surrounds this passage in other words.
In favourable improvement project; The single turbulence of turbulence generation device produces passage and constructs in this wise; That is, the flow cross section in turbulence generation device outlet of passage and the cross-sectional area of nozzle in the import in nozzle attach troops to a unit ratio to the division area of this passage be in from 0.5 to 0.95 the scope, preferably in from 0.75 to 0.95 the scope, especially preferably in from 0.75 to 0.9 the scope.
This type preferably opened at page or leaf according to the head box of the present invention's structure and formed in the unit to the machine use that is used to make fiber web, particularly paper web material, board web material or paper handkerchief width of cloth material; This page opened the formation unit and comprised the forming unit that is placed on this head box in addition; In this forming unit, under the situation that limits truncation Line, fibrous substance suspension is executed cloth with the free jet mode from the outlet gap of head box and introduce in other words the net that stretches tight.At this, the enforcement of head box is carried out in this wise, that is, the time of staying of fibrous substance suspension in nozzle and in the turbulence generation device is held in the lowland as far as possible.Forming unit may be embodied as at this: the hybrid shaping device; The slit former comprises the sieve band of two formation to the import slit of fibrous substance suspension; Or long sieve former, comprise the sieve band, on the surface of this sieve band, execute the measuring fiber material suspension by head box.
Description of drawings
By accompanying drawing foundation solution of the present invention is carried out explained in detail below.Wherein illustrate as follows to details:
Fig. 1 be illustrated in by curve map employed fibrous substance suspension density of material size and be shaped between relation;
Fig. 2 illustrates according to head box of the present invention by the intercept of being opened the axial section that forms the unit by the page or leaf of the machine that is used for manufactured materials width of cloth material;
Fig. 3 a is shown specifically by the intercept according to the foundation head box of the present invention of Fig. 2;
Fig. 3 b illustrates the view A-A according to Fig. 3 a; And
Fig. 4 a to 4d is illustrated in the possible geometric configuration that turbulence produces volume that can be through-flow after last fluidisation zone in the passage.
The specific embodiment
Fig. 1 illustrates the influence of density of material SD to being shaped of fibrous substance suspension FS by curve map.This curve map is constructed in view of the flocculent structure FL that the scale details ground of the flocculation FL of structure voluntarily that depends on density of material SD is illustrated in the free jet that fibrous substance suspension FS obtains under the situation that the nozzle of head box flows out.Therefrom can find out; Relation between high density of material SD and the shaping different and that be thick cloud form that forms (arrow FL+) in view of the layout of fiber and packing material by the flocculation of increase; That is to say; In traditional known head box, the fibrous substance suspension FS free jet of discharging, there is the trend of bigger flocculation FL from the outlet gap of head box.Can find out in addition; In fibrous substance suspension FS (arrow FL-) with the low density of material that is lower than about 1.2% density of material characteristic value SDk; Flocculation forms less; That is to say in the outlet that the outlet gap by head box comes out, in free jet, only to also have less flocculation to be observed.Fig. 1 only is illustrated in the denseness of fibrous suspension FS and the fundamental relation between the tendency of flocculation at this.This also depends on selected fibrous material itself.
Fig. 2 illustrates at the machine that is used for manufactured materials width of cloth material, use the intercept according to the head box 1 of the present invention's structure of speech especially for the machine of making paper web material, board web material or paper handkerchief width of cloth material form with the view of schematically simplifying greatly, have be used to reduce again flocculate, that is to say before the discharge of head box 1 or when discharging in the foundation length L of the present invention of the inner nozzle 4 that flocculates again of fibrous substance suspension FS.Head box 1 only is prepended to here the forming unit 2 that illustrates for example by the net that stretches tight and opens with its formation page or leaf and forms unit 3.The function of head box 1 is at least a fibrous substance suspension FS is taken out of with machine-wide in the forming unit 2 at this, and this carries out through at least one nozzle 4.In order to illustrate single direction, be provided with coordinate system on the intercept shown in the page or leaf of representing the for example formation unit 3.Directions X is represented the longitudinal direction of machine and is also referred to as machine direction MD.This machine direction is consistent with the direction of passage of fiber web.The Y direction indication is transverse to the width of the direction of the direction of passage of fiber web F, particularly machine, and therefore is also referred to as cross-machine direction CD, and the Z direction is then corresponding to short transverse.Shown in situation under, the through-flow direction in the head box 1 is consistent with machine direction MD.But also it is contemplated that other layout, particularly tilt with respect to machine direction MD.
At single turbulence generation device, be the inside of turbulence generation device 6 here, fibrous substance suspension FS correspondingly separate with the division that limits in advance and guides with the shunting mode ground that distributes.Turbulence generation device 6 comprises that for this reason a large amount of turbulences of on machine direction MD, extending along through-flow direction with at least one durection component produce passage 7.xy; These passages or by machine-wide structure, or along cross-machine direction CD in parallel with each other with the capable Rx of x >=1 and vertically, just be arranged parallel to each other perpendicular to plane that can be through through-flow direction and the cross-machine direction CD description row SPy with y >=1.First subscript of Reference numeral back is described in the layout of the single passage in the capable Rx separately, and second subscript then is illustrated in perpendicular to the layout in the row SPy separately of cross-machine direction CD.Notion " passage " is not described on concrete fixing embodiment structurally that limits and the function and is interpreted as flow channel.This flow channel can or be incorporated into the pass through openings that processes in other words in solid by single component and form.The single turbulence that can find out the first row SP1 here produces passage 7.11 to 7.31.Turbulence generation device 6 forms the grid that flows and also can implement for this reason dissimilarly.Under the simplest situation, this turbulence generation device comprise describe that turbulence produces passage 7.xy with have the orifice plate of through-flow openings and/or form the tube bank that single turbulence produces passage 7.xy.It is flow channel that single turbulence produces passage 7.xy, and attaching troops to a unit or integrate therein for it is used to produce the utensil of turbulence.The energy that under being configured with the situation of turbulence, proceeds in the shunting that guides in the passage separately through these utensils is imported.This zone is also referred to as fluidisation zone 12; Wherein, The set inside that produces passage 7.xy in turbulence has at least one such fluidisation zone 12, and the pressure that in this fluidisation zone, is created in the single shunting of the fibrous substance suspension FS that guides in this fluidisation zone changes.This fluidisation zone can produce the enforcement of the geometry of passage 7.xy, particularly local these cross-sectional areas of describing along through-flow direction and/or the layout of changing through single turbulence and be used for that additional energy input is incorporated into additional device single, that produce the shunting that guides in the passage 7.xy in separately turbulence and obtain.
According to head box 1 of the present invention structure and enforcement like this; That is, fibrous substance suspension FS, particularly single shunting in turbulence generation device 6 perhaps, but preferred and time of staying nozzle 4 under situation about keeping, be lowered by enough qualities of the free jet of outlet gap 11 discharges of the nozzle 4 of head box.
For reduce fibrous substance suspension FS in turbulence generation device 6, the time of staying of single shunting in turbulence produces passage 7.xy particularly, this passage is implemented in this wise, that is, its length as far as possible littlely is kept go to mix tendency so that reduce.Single for this reason turbulence produces passage 7.xy and is implemented in this wise and construct, that is, the determined total measurement (volume) VTE of single subregional single volume summation by turbulence generation passage 7.xy of this passage is held as few as possible.The total measurement (volume) VTE that single turbulence produces passage 7.xy confirms according to the following relationship formula at the through-flow volume V F after fluidisation zone 12 that this depends on the turbulence generation device:
V
TE=k2·V
F
Wherein,
V
TESingle turbulence produces the total measurement (volume) of passage;
The k2 constant, 1≤k2≤2, preferred 1≤k2≤1.5; And
V
FThe through-flow volume after fluidisation zone 12 of turbulence generation device 6.
In particularly advantageous embodiment, can by single minute circulation stream in other words can be through-flow volume V
FSelect in this wise, that is, with on the outlet 6a of turbulence generation device 6 and the cross-sectional area B that opens wide of the open surface form on the import 4E in nozzle 4 thus
TOGood filling be reached.Through-flow volume V
FFormed by the subregion that turbulence produces passage 7.xy at this, extend from the outlet 6A ground of fluidisation zone 12 until turbulence generation device 6 this subregion.At this, embody the volume V that exports the characteristic in the zone of extending on 6A ground from fluidisation zone 12 until the turbulence generation device that turbulence produces passage 7.xy
FShould be as far as possible little, so that guarantee as far as possible little flocculation again.According to the present invention, this for single turbulence produce passage 7.xy from fluidisation zone 12 until the extension of the outlet 6A ground of turbulence generation device 6 so that with current unlimited cross-sectional area B
TOThe through-flow volume of corresponding subregion is:
Wherein,
V
F Turbulence generation device 6 is through-flow volume after last fluidisation zone 12;
The k1 constant, 1≤k1≤10, preferred 3≤k1≤7; And
B
TOTurbulence produces the cross-sectional area that open wide of passage 7.xy on the outlet 6A of turbulence generation device 6.
In particularly advantageous embodiment, construct in this wise and implement according to head box 1 of the present invention, that is, the time of staying of fibrous substance suspension FS in nozzle 4 also is lowered under the situation of the enough qualities that keep the free jet of being discharged by outlet gap 11.In order to be reduced in the time of staying in the nozzle 4 under the situation that in outlet gap 11, also has enough jet qualities, confirm according to the function that the length L of nozzle 4 of the present invention is divided as the fluid power of the grid wake flow in nozzle 4.
Specifically, the length L of nozzle 4 is as dividing area B
TFunction confirm.Divide area B
TMore little, the length L of nozzle 4 is short more.The length L of nozzle 4 is corresponding in the extension of the outlet 6A of turbulence generation device 6 between outlet gap 11 spacing in other words.The length L of nozzle 4 is measured on flow direction, that is to say perpendicular to the outlet cross section ground of turbulence generation device 6 measured.In order to obtain the desirable jet quality in outlet gap 11, the function that the length L of being implemented of nozzle 4 is divided as fluid power:
Wherein,
The length of L nozzle 4;
The k constant, wherein, 10≤k≤20; And
B
TDivide area.
Divide area B
TCorresponding to nozzle 4 in nozzle head end attaching troops to a unit on the cross-sectional area on the nozzle inlet 4E in other words to fluid power unit E
HArea portions.At this, have or the unit that comprises single turbulence generation passage 7.xy is called as hydraulic power unit E individually or as the part ground of total unit
HThis hydraulic power unit comprises that passage and at least one form the wall that surrounds this passage in other words.Divide area B
TTherefore can be by the quantity N, the amount formed merchant that single turbulence just produces passage 7.xy of the cross-sectional area on the import 4E and independent flow cross section confirm in other words at the nozzle head end.
These sizes confirm and by representing by intercept according to the head box 1 of Fig. 2 with being illustrated in Fig. 3 a and Fig. 3 b exemplified.
Fig. 3 a illustrates nozzle 4 and the turbulence generation device 6 that directly on flow direction, is prepended to this nozzle.In order to illustrate the turbulence generation passage 7.11 to 7.31 in triplex row with fluidisation zone 12.11 to 12.31 only is shown here.
Fig. 3 b illustrates the view on the outlet 6A of turbulence generation device 6 for example with the view A-A according to Fig. 3 a; That this turbulence generation device is included in is that cross-machine direction CD go up to extend, for example produce passage 7.11 to 7.4n with four lines R1 to R4 and a plurality of row SPy, SP1 to the SPn single turbulence of arranging here; Wherein, the inner single turbulence of single capable R1 to R4 produce passage 7.11 to 7.1n, 7.21 to 7.2n, 7.31 to 7.3n with 7.41 to 7.4n each preferably on cross-machine direction CD, arranging and equally preferably the carrying out in parallel with each other with the layout vertical of row R1 to R4 in parallel with each other with through-flow direction with cross-machine direction CD with preferred identical division.Can be referred to herein as by the nozzle head end transverse cross-sectional area that single turbulence generation passage 7.11 to 7.xy loads and divide area B T.Single hydraulic power unit EH here for example representes to have the form that single turbulence produces the unit of passage 7.11.The part that the attaching troops to a unit of total cross section on the import 4E in nozzle 4 produces passage 7.11 to single turbulence is by on the nozzle head end or mention the merchant that the quantity N of cross-sectional area Q4E and turbulence generation passage 7.xy on the import 4E in the nozzle 4 forms and draw.
Wherein
Q
4ECross-sectional area on the import 4E of nozzle head end/in the nozzle 4; And
The quantity of the single flow channel of N in preposition turbulence generation device, particularly turbulence produce the quantity of passage.
Cross-sectional area Q on nozzle head end 4E
4EConfirm as the function of the extension of nozzle 4 on cross-machine direction CD, just by with the width of turbulence generation device 6 on outlet 6A and highly consistent width AB and h highly
DConfirm, just
Q
4E=AB·h
D
Area B is divided in the conduct of the total cross section on the import 4E in nozzle 4
TAttach troops to a unit produce the part of passage 7.11 to turbulence can this external hydraulic power unit E
HHave the wall that intactly is adjacent to each other shown in embodiment in, under rectangular cross section situation through by hydraulic power unit E
HThe long-pending of the long t1 of size, particularly side and t2 confirm.Divide area B
TAt this corresponding to single hydraulic power unit E
HArea, just produce the cross-sectional area of passage surface area on the output of turbulence generation device 6 and that draw through wall thickness d, just corresponding to hydraulic power unit E corresponding to turbulence
HThe summation of that open wide and area closure.If a plurality of single hydraulic power unit E
HConstruct in this wise, that is, their wall is not in contact with one another, and long t1 of side and t2 produce the length of the grid mesh of passage 7.xy to single turbulence corresponding to attaching troops to a unit of the theoretic grid on the outlet 6A that is placed in turbulence generation device 6 so.
In particularly advantageous further exploitation, the time of staying in nozzle 4 is in addition through being affected in the flowing velocity that when single turbulence generation passage 7.xy shifts, changes single shunting to nozzle 4.According to possibility, this change should be as far as possible little be held.According to the present invention, turbulence generation device 6 is implemented in this wise for this reason and arranged, that is, and the division area B of the cross-sectional area of nozzle 4 on the nozzle head end
TThe cross-sectional area B that opens wide on the import 4E in nozzle 4
TOImplement in this wise and definite size, that is, and export ratio B
TOCompare B
T>0.5, preferred>0.75.Export ratio adopts the z mark, by following acquisition:
And define the ratio of flowing velocity of head end cross section of flowing velocity and the nozzle 4 of the last flow cross section of streamwise in turbulence generation device 6.B
TOProduce the cross-sectional area on the outlet 6A of passage 7.xy corresponding to separately turbulence and therefore described turbulence separately at this and produce the flow cross section of passage on outlet 6A at turbulence generation device 6.
Through-flow volume V F can at random construct in view of the form of guide of flow.Fig. 4 a to Fig. 4 d illustrates different embodiment for example, wherein, also with the turbulence pipe be give an example illustrate routinely fluidisation zone 12 to having the different possibilities of structure that turbulence produces the hydraulic power unit EH of passage 7.xy.
Fig. 4 a illustrates and is divided at least two subregions, i.e. first subregion 18 and second subregion 13 of describing through-flow volume V F.The outlet cross section ground of this second subregion on the outlet 6A that reaches at turbulence generation device 6 is through characterizing along the constant flow cross section of through-flow direction.Fluidisation zone 12 here part receives boundary ground on through-flow direction, to change 17 through being stepped cross section, and particularly the expansion between first and second subregion 18 and 13 forms.
Fig. 4 b illustrates for example has other structure that turbulence produces the hydraulic power unit EH of passage 7.xy, and the zone of wherein describing through-flow volume V F is formed by a large amount of subregions of varying cross-section embodiment extremely.The zone of describing through-flow volume V F here for example characterizes through three subregions 13.1,13.2 and 14; Wherein, Subregion 13.1 is extended the ground structure with 13.2 with flow cross sections constant but different sizes on flow direction, these subregions interconnect through the subregion 14 that forms zone line.Subregion 14 changes sign through the cross section that continues on flow direction, and this cross section change is configured to cross section to be increased.Fig. 4 c illustrates the structure of zone line as the subregion 15 with lasting cross section minimizing in contrast to this.In two kinds of embodiments; Ground is extended through the subregion of hydraulic power unit EH in fluidisation zone 12 on through-flow direction implement; Wherein, as the function of the geometry of flow path and/or physical dimension, produce passage 7.xy, carry out with the cross section that the contrast adjacent areas reduces for the structure in the subregion 16 here in single turbulence.
Fig. 4 d illustrates according to embodiment Fig. 4 b, that have the structure in fluidisation zone 12, and the utensil that at least one static(al) mixing arrangement 19 to be provided with in the fluidisation zone of fluidisation zone passage or at least one are used for the energy input produces in fibrous substance suspension under the situation of the desirable pressure loss and is caused.
Embodiment:
The single hydraulic power unit E of turbulence generation device 6
HBe configured to have the discharge pipe of the cross section that is square.Long t1 of side and t2 are 25mm.Wall thickness d is 1mm.Divide area B
TBy following generation:
B
T=t1·t2=625mm
The length L of nozzle 4 corresponding to
Be in between the 250mm to 500mm.This length range makes the time of staying of the enough weak points under the situation keep sufficiently high jet quality at the same time become possibility.
Export ratio z draws 0.84 value to the embodiment of k=10.
Volume that can be through-flow
Draw as follows:
V
F(k1=1)=12167mm
3
V
F(k1=10)=121670mm
3
V
F(k1=3)=36500mm
3
V
F(k1=7)=85000mm
3
Be applicable to that according to solution of the present invention structure is with or without the head box 1 of diaphragm.Importantly depend on the division area B here
TThe length L of nozzle 4 is selected on ground, this division area corresponding to single hydraulic power unit on nozzle head end cross section part and can be used as by nozzle head end cross section Q
4EWith single hydraulic power unit E
HThe merchant that forms of quantity N confirm.
The head box 1 of design can be made amendment by any-mode like this.Can relate to following head box at this, these head boxs are equipped with diaphragm and/or utilize dilution water technology, that is to say, at least one that is used at least a other fluid mixes in the fibrous substance suspension mixed device characterization.
Can use with the forming unit 2 of any configuration, particularly length sieve, hybrid shaping device and the combination of double deck screen former in addition according to head box 1 of the present invention.
Reference numerals list
1 head box
2 forming units
Open for 3 pages and form the unit
4 nozzles
Import, particularly the nozzle head end of 4E in the nozzle
5 input equipments
6 turbulence generation devices
The outlet of 6A turbulence generation device
7; 7.xy turbulence produces passage
7.11-7.1n, the 7.21-7.2n turbulence produces passage
7.31-7.3n, the 7.41-7.4n turbulence produces passage
8 nozzle boxs
9 choke blocks
10.1,10.2 nozzle walls
11 outlet gaps
12,12.11-12.31 fluidisation zone
13,13.1,13.2 subregions
14 subregions
15 subregions
16 subregions
17 are stepped cross section changes
18 subregions
19 mixing arrangements
The A-A view
AB nozzle head end cross section turbulence generation device in other words is horizontal at machine
Width on direction
B
TDivide area
B
TODivide the area that opens wide of area; Turbulence produces passage and produces in turbulence
The cross-sectional area that opens wide in the outlet of generating apparatus
The CD cross-machine direction
The d wall thickness
E
HHydraulic power unit
The FL flocculation
The FS fibrous substance suspension
h
DThe height of the height of nozzle, turbulence generation device
The k constant
The k1 constant
The k2 constant
The length of L nozzle
The MD machine direction
N quantity
Q
4ECross-sectional area on the nozzle head end
R1-R4; Rx is capable
The SD density of material
SD
kThe density of material characteristic value
The SP1-SPy row
T1, t2 side are long
V
FThrough-flow volume
V
TETurbulence produces the total measurement (volume) of passage
X, Y, Z coordinate
The z export ratio
Claims (11)
1. head box (1); Be used for using at the machine of being made fiber web, particularly paper web material, board web material or paper handkerchief width of cloth material by at least a fibrous substance suspension (FS), said head box comprises: at least one imports the input equipment (5) of said at least a fibrous substance suspension (FS); Be used for discharging the nozzle with outlet gap (11) (4) of said fibrous substance suspension (FS) and the turbulence generation device (6) that streamwise directly is prepended to said nozzle (4) with free jet; Can produce passage (7,7.xy, 7.11-7.4n) through a large amount of turbulence at least a fibrous substance suspension (FS) described in the said turbulence generation device guides with shunting mode; Wherein, Producing passage (7,7.xy, 7.11-7.4n) set inside in single turbulence has at least one to form the zone in fluidisation zone (12,12.11-12.31); It is characterized in that; Said turbulence generation device (6) is constructed in this wise, that is, single turbulence produces the total measurement (volume) (V of passage (7,7.xy, 7.11-7.4n)
TE) volume (V until the outlet (6A) of said turbulence generation device (6) that depends on that this single turbulence produces that passage (7,7.xy, 7.11-7.4n) afterwards can be through-flow in (12,12.11-12.31) along the last fluidisation zone of through-flow direction
F) be:
V
TE=k2·V
F
Wherein,
V
TESingle turbulence produces the total measurement (volume) of passage (7,7.xy, 7.11-7.4n);
The k2 constant, 1≤k2≤2, preferred 1≤k2≤1.5; And
V
FSaid turbulence generation device (6) is (12,12.11-12.31) through-flow afterwards volume in said fluidisation zone.
2. by the described head box of claim 1; It is characterized in that; Said turbulence generation device (6) is constructed in this wise; That is, produce inner the volume (V that afterwards can be through-flow in (12,12.11-12.31) of passage (7,7.xy, 7.11-7.4n) until the outlet (6A) of said turbulence generation device (6) along the last fluidisation zone of through-flow direction in said single turbulence
F) produce the cross-sectional area (B that open wide of passage (7,7.xy, 7.11-7.4n) in the outlet (6A) of said turbulence generation device (6) as said single turbulence
TO) function:
Wherein,
V
FSaid turbulence generation device (6) is (12,12.11-12.31) through-flow afterwards volume in last fluidisation zone;
The k1 constant, 1≤k1≤10, preferred 3≤k1≤7; And
B
TOSaid turbulence produces the cross-sectional area that open wide of passage (7,7.xy, 7.11-7.4n) in the outlet (6A) of said turbulence generation device (6).
3. by claim 1 or 2 described head boxs; It is characterized in that, produce inner the volume (V that afterwards can be through-flow in (12,12.11-12.31) of passage (7,7.xy, 7.11-7.4n) until the outlet (6A) of said turbulence generation device (6) along the last fluidisation zone of through-flow direction in said single turbulence
F) have at least one and have the volume area (13,13.1,13.2) along the constant flow cross section of through-flow direction.
4. by one of aforementioned claim described head box; It is characterized in that, produce inner the volume (V that afterwards can be through-flow in (12,12.11-12.31) of passage (7,7.xy, 7.11-7.4n) until the outlet (6A) of said turbulence generation device (6) along the last fluidisation zone of through-flow direction in said single turbulence
F) have a volume area (14,15) that at least one has the flow cross section that continues to increase or reduce along through-flow direction.
5. by one of aforementioned claim described head box; It is characterized in that, in the last fluidisation zone of import (4E) front in said nozzle (4) (12,12.11-12.31) observe along through-flow direction and/or in mixing arrangement (19) by the part of the cross-sectional area of said single turbulence generation passage (7,7.xy, 7.11-7.4n), be stepped change (17) and form.
6. by one of aforementioned claim described head box, it is characterized in that said nozzle (4) has following length (L), said length is as the cross-sectional area (Q of said nozzle (4) in the import (4E) in said nozzle (4)
4E) attach troops to a unit and divide area (B with describing to what single turbulence produced passage (7,7.xy, 7.11-7.4n)
T) the function of size of part area:
Wherein,
The length of the said nozzle of L (4);
The k constant, wherein, 10≤k≤20; And
B
TDivide area.
7. by one of aforementioned claim described head box, it is characterized in that single division area (B
T) size corresponding to by the cross-sectional area (Q of said nozzle (4) in the import (4E) in said nozzle (4)
4E) and the said single turbulence in directly being prepended to the said turbulence generation device (6) of said nozzle (4) produce the merchant that the quantity (N) of passage (7,7.xy, 7.11-7.4n) forms.
8. by one of aforementioned claim described head box, it is characterized in that single division area (B
T) have or form the hydraulic power unit (E that single turbulence produces passage (7,7.xy, 7.11-7.4n) by single
H) cross-sectional area in the outlet (6A) of said turbulence generation device (6) forms.
9. by one of aforementioned claim described head box; It is characterized in that; The said single turbulence of said turbulence generation device (6) produces passage (7,7.xy, 7.11-7.4n) structure in this wise; That is, said single turbulence produces the cross-sectional area (B that opens wide of the flow cross section in the outlet (6A) that is described in said turbulence generation device (6) of passage (7,7.xy, 7.11-7.4n)
TO) and the cross-sectional area (Q in the import (4E) in said nozzle (4)
4E) attaching troops to a unit produces the division area (B of passage to said single turbulence
T) ratio (Z) be in from 0.5 to 0.95 the scope that comprises given figure, preferably include in from 0.75 to 0.9 the scope that preferably includes given figure in from 0.75 to 0.95 the scope of given figure, especially.
10. page or leaf is opened and is formed unit (3); To the machine that is used to make fiber web, particularly paper web material, board web material or paper handkerchief width of cloth material; Comprise by the described head box of one of claim 1 to 8 (1) and be placed on the forming unit (2) of said head box that said fibrous substance suspension (FS) is executed cloth by the said outlet gap (11) of said head box (1) with the free jet mode and introduced in other words in said forming unit.
11. open formation unit (3) by the described page or leaf of claim 10, it is characterized in that said forming unit (2) is embodied as one of the following units:
-hybrid shaping device;
-slit former comprises that two formation are to the net that stretches tight in the import slit of said fibrous substance suspension (FS), particularly sieve band;
-long sieve former comprises the sieve band, on the surface of said sieve band, executes the said fibrous substance suspension of cloth (FS) by said head box (1).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102010001614A DE102010001614A1 (en) | 2010-02-05 | 2010-02-05 | Headbox and sheet forming unit with a headbox |
| DE102010001614.4 | 2010-02-05 | ||
| PCT/EP2011/051641 WO2011095582A1 (en) | 2010-02-05 | 2011-02-04 | Headbox and sheet-forming unit comprising a headbox |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102782214A true CN102782214A (en) | 2012-11-14 |
Family
ID=43896871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011800084923A Pending CN102782214A (en) | 2010-02-05 | 2011-02-04 | Headbox and sheet-forming unit comprising a headbox |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2531648A1 (en) |
| CN (1) | CN102782214A (en) |
| DE (1) | DE102010001614A1 (en) |
| WO (1) | WO2011095582A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107667195A (en) * | 2015-05-22 | 2018-02-06 | 福伊特专利有限公司 | Method and apparatus for manufacturing high compactedness paper |
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|---|---|---|---|---|
| DE19937302A1 (en) * | 1999-08-10 | 2001-02-15 | Voith Paper Patent Gmbh | Stock inlet for papermaking machine has turbulence insert with structured turbulence channels shaped with expansion zones to prevent stripe effects and reduce or eliminate flow instabilities |
| DE10230301A1 (en) * | 2002-07-05 | 2003-04-03 | Voith Paper Patent Gmbh | Paper-making fibre dispensing jets, have vortex generators causing pressure drop |
| CN1436263A (en) * | 2000-06-13 | 2003-08-13 | 麦特索纸业公司 | Headbox of paper machine or such |
| DE10234559A1 (en) * | 2002-07-30 | 2004-02-19 | Voith Paper Patent Gmbh | Papermaking machine for low-volume paper or carton has vortex generator block made of a single integral plastic unit with jets discharging to sieve belt |
| CN1205384C (en) * | 2001-03-19 | 2005-06-08 | 三菱重工业株式会社 | Tube bank structure and flow tube producing method |
| CN102575425A (en) * | 2009-08-10 | 2012-07-11 | 沃依特专利有限责任公司 | Headbox, sheet-forming unit having a headbox and method for operating a sheet-forming unit |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29713433U1 (en) | 1997-07-29 | 1997-09-11 | Voith Sulzer Papiermasch Gmbh | Headbox |
| DE19902623A1 (en) | 1999-01-23 | 2000-07-27 | Voith Sulzer Papiertech Patent | Headbox |
| DE19902621A1 (en) | 1999-01-23 | 2000-07-27 | Voith Sulzer Papiertech Patent | Stock inlet for a papermaking machine has dividers in the second flow path section giving suspension flow channels of the same length and identical cross section to reduce or eliminate tiger stripe effects in the paper |
| DE10106684A1 (en) | 2001-02-14 | 2002-08-29 | Voith Paper Patent Gmbh | Slat of a headbox of a paper, cardboard or tissue machine |
| DE10234550B4 (en) | 2002-07-30 | 2004-08-05 | Schneller, Bernhard, Dr. | Device for axially widening a hole in a bone substance |
| WO2008077585A1 (en) | 2006-12-22 | 2008-07-03 | Voith Patent Gmbh | Headbox of a machine for the production of a fibrous material web |
-
2010
- 2010-02-05 DE DE102010001614A patent/DE102010001614A1/en not_active Withdrawn
-
2011
- 2011-02-04 WO PCT/EP2011/051641 patent/WO2011095582A1/en active Application Filing
- 2011-02-04 CN CN2011800084923A patent/CN102782214A/en active Pending
- 2011-02-04 EP EP11702216A patent/EP2531648A1/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19937302A1 (en) * | 1999-08-10 | 2001-02-15 | Voith Paper Patent Gmbh | Stock inlet for papermaking machine has turbulence insert with structured turbulence channels shaped with expansion zones to prevent stripe effects and reduce or eliminate flow instabilities |
| CN1436263A (en) * | 2000-06-13 | 2003-08-13 | 麦特索纸业公司 | Headbox of paper machine or such |
| CN1205384C (en) * | 2001-03-19 | 2005-06-08 | 三菱重工业株式会社 | Tube bank structure and flow tube producing method |
| DE10230301A1 (en) * | 2002-07-05 | 2003-04-03 | Voith Paper Patent Gmbh | Paper-making fibre dispensing jets, have vortex generators causing pressure drop |
| DE10234559A1 (en) * | 2002-07-30 | 2004-02-19 | Voith Paper Patent Gmbh | Papermaking machine for low-volume paper or carton has vortex generator block made of a single integral plastic unit with jets discharging to sieve belt |
| CN102575425A (en) * | 2009-08-10 | 2012-07-11 | 沃依特专利有限责任公司 | Headbox, sheet-forming unit having a headbox and method for operating a sheet-forming unit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107667195A (en) * | 2015-05-22 | 2018-02-06 | 福伊特专利有限公司 | Method and apparatus for manufacturing high compactedness paper |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2531648A1 (en) | 2012-12-12 |
| WO2011095582A1 (en) | 2011-08-11 |
| DE102010001614A1 (en) | 2011-08-11 |
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Application publication date: 20121114 |