CN102076906A - Determination of speed relations between driving groups of a paper machine - Google Patents
Determination of speed relations between driving groups of a paper machine Download PDFInfo
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- CN102076906A CN102076906A CN2009801242429A CN200980124242A CN102076906A CN 102076906 A CN102076906 A CN 102076906A CN 2009801242429 A CN2009801242429 A CN 2009801242429A CN 200980124242 A CN200980124242 A CN 200980124242A CN 102076906 A CN102076906 A CN 102076906A
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- driven unit
- measured value
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G9/00—Other accessories for paper-making machines
- D21G9/0009—Paper-making control systems
- D21G9/0036—Paper-making control systems controlling the press or drying section
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
- D21F5/04—Drying on cylinders on two or more drying cylinders
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Abstract
The invention relates to a paper machine comprising at least one predrying section (PDS) equipped with at least one driving group (PDS_m-1, PDS_m), each of which has at least one drying cylinder (Z) for drying a paper web (PB). In order to automatically determine the speed relations between the driving groups, a method comprising the following steps is provided: measured values such as, in particular, speeds of the driving groups (PDS_m-1, PDS_m), the surface-related mass of the paper web (PB), humidity measurements downstream of the last drying cylinder (Z) of the predrying section (PDS), and/or steam pressures in the drying cylinders (Z) are provided; the humidity (u) of the paper web (PB) is calculated from the measured values downstream of each drying cylinder (Z); at least one web expansion (epsilon) is calculated from a humidity-dependent modulus of elasticity (E) and at least one predefined desired web tension (sigma); and the speed relations are calculated from the at least one web expansion (epsilon).
Description
Technical field
The present invention relates to the method and the paper machine of length velocity relation between a kind of driven unit of definite paper machine, have at least one and have predrying section of at least one driven unit, wherein predrying section driven unit has the drying drum that at least one is used for dry paper tape respectively.
The invention still further relates to computer program, be used to the computer program of carrying out said method and having this computer program.
Background technology
This method is used in the paper conversion field.In common paper machine the glue laminated machine be positioned at predrying section the back and the back dryer section be positioned at glue laminated machine back.But in some cases, for example in the newspaper paper machine, also there is only predrying section and back dryer section that does not have the glue laminated machine.Predrying section and optionally the back dryer section generally form by a plurality of steam-heated drying drums respectively.This drying drum that generally makes a plurality of orders together in driven unit with identical speed drive, that is, and the drying drum in for example predrying section in m driven unit and the drying drum of back dryer section in n driven unit.
In these dry components of paper machine, paper tape is dried to definite final moisture content from initial humidity.Change its characteristic at this paper tape, also may change elastic modelling quantity, it directly depends on water capacity on function.In order to guarantee to be with stress (being also referred to as tensile force of belt) uniformly, it is for product quality parameters and for paper tape stability no less important (as far as possible little hyperextension, small tearing; But also essential certain lowest pull, therefore guarantee paper tape on winding roller guiding and avoid folding), the speeds match of single dry component is in dry profile.
Present technical problem is how to set speed theoretical value, especially differential theoretical value or the relative theory value of the driven unit of predrying section (also may comprise the back dryer section).Must adjust again by the length velocity relation of driven unit according to the observation or by the deviation in the thoughts and feelings identification paper tape pulling force and by hand by the operator according to present state of the art.
Summary of the invention
The objective of the invention is, automatically determine the length velocity relation of the driven unit of paper machine.
This purpose is achieved by the method for the length velocity relation between a kind of driven unit that is used for determining paper machine, wherein paper machine has at least one and has predrying section of at least one driven unit, and wherein predrying section driven unit has the drying drum that at least one is used for dry paper tape respectively, has following step:
Measured value is provided, especially the measured value of the quality of the unit are of the measured value of the speed of driven unit, paper tape, at the measured value of the moisture measurement of predrying section last drying drum back and/or the measured value of the steam pressure in the drying drum,
-calculate the band humidity of the paper tape of each drying drum back by measured value,
-by at least one the band strain of elastic modelling quantity and at least one given theory band Stress calculation and
-calculate length velocity relation by described at least one band strain.
Described purpose also is achieved by paper machine, computer program and the computer program with the feature that provides in claim 5,6 and 7.
By according to the invention provides actual process parameter as the measured value of band humidity, grammes per square metre, material velocity, disengagement area, steam pressure and quantity of steam, equipment geometry etc. for determine the essential measured value of length velocity relation in the position that is fit to, as in computer program for use.Generally already occur in the different parts at equipment at these these measured values.Only, provide measured value also to comprise and measure relevant measured value for the situation that in special paper machine, does not have at least one this essential measured value.
In so-called " drying model ", calculate relative humidity u_i according to the present invention at the paper tape of each cylinder i back of predrying section by the measured value that provided.In this paper tape humidity in the position
x_2＝x_1+ΔL
By
u_2＝u_1-[(m_u+m_o)/Gatro]·(ΔL/V_M)
Provide, wherein V_M is a device rate, and adiabatic drying (atro) grammes per square metre is
Gatro＝m_F/A
(m_F: the quality of dry paper tape, A: relevant paper tape area).Evaporation rate m_u on paper tape bottom surface and end face and m_o satisfy Si Tepan (Stefan) formula, also add therein the device specific parameter as gross pressure and temperature in the existing drying hood.
Elastic modelling quantity (E-modulus) (it is for example known by laboratory measurement) by depending on humidity can calculate essential band strain stress by given theory band stress σ, calculates length velocity relation between the single driven unit again by the band strain then.Needn't be constant in whole predrying section and back dryer section at this theoretical band stress σ, but between single driven unit, change, because paper tape increase along with drying in predrying section just reaches for the required intensity of bigger band stress.
Paper tape is different from " steady-state vibration state " after the drying curve on the single drying drum is especially stopping or tearing: stop back (for example the tearing the back) of lacking, common betwixt (a little) heat drying cylinder, then the paper tape of producing has lower moisture curve (that is, the humidity u_i on cylinder i is lower than normal value).After long stopping, the steam pressure of drying drum descends betwixt, and cylinder may also not reach " operating temperature ", and the moisture curve of the paper tape of then producing is higher than normal value.Therefore the apparatus manager must make length velocity relation be matched with the characteristic of variation when starting.
If set band strain (length velocity relation in other words) mistakenly, this may cause when too big strain with tearing and causing being with flutter (Bahnflattern) during in too little strain, and this may cause bad paper quality and also may cause tearing.By length velocity relation according to variation in the solution identification moisture curve of the present invention and the variation between definite automatically driven unit that causes thus.This advantage of bringing is, the paper tape quality that is produced no longer depends on operator's (apparatus manager) experience and notice, but guarantees the uniform quality brought by uniform band strain reliably.
In favourable scheme form,-wherein paper machine has glue laminated machine and back dryer section, they have at least one driven unit respectively, wherein the driven unit of back dryer section has the drying drum that at least one is used for dry paper tape,-velocity measurement of driven unit is provided, the measured value of moisture measurement in the last drying drum back of back dryer section, the measured value that the measured value of the mass flow of institute's coating adhesive amount and the water in the glue laminated machine apply, and apply by the moisture measurement of predrying section last drying drum back and water and to calculate glue laminated machine and the back band humidity between the dryer section.In this way also can be for the length velocity relation between automatically definite all driven units of the paper machine with glue laminated machine and back dryer section.
In another advantageous embodiments, come the calculating elastic modulus by band humidity, the band stress that each is measured in glue laminated machine front and back and the strain of determining by the speed of the driven unit that participates in.Realize calculating by alternate model (" E-modulus-model ") at this.Avoid unreliability thus, they are caused by the laboratory measurement of the elastic modelling quantity that depends on humidity, because its prerequisite is (elastic modelling quantity) characteristic sufficiently constant (this for example is common situation certainly) in the newspaper paper machine.Depend on the humidity elastic modelling quantity because calculate by the continuous measurement value of paper tape in this embodiment, also (adapt to ground fully) according to method of the present invention and adapt to variation automatically in the paper tape Elastic Modulus.
In another advantageous embodiments, automatically set the length velocity relation between the driven unit.That is, the length velocity relation that is calculated by the band strain is stipulated to drive controlling as theoretical value.Therefore different compatibly related with the measurement data for the using present part of appliance of only separately observing, be used to reach for product quality and technology usability and advantageously set, it at present can only be by operator's (approx) setting manually.Because by the process data that continuous measurement obtains, this method is adaptive automatically and has height reliability.
Description of drawings
Describe and explain the present invention below in detail by means of embodiment shown in the drawings.In the accompanying drawing:
Fig. 1 letter illustrates the driven unit of paper machine,
Fig. 2 illustrates elastic modelling quantity and the relation of being with humidity,
Fig. 3 illustrates band stress and the relation of being with strain.
The specific embodiment
Fig. 1 letter illustrates paper machine, has predrying section (PDS, " Pre-Dryer Section "), glue laminated machine (SP, " Size Press ") and back dryer section (ADS, " After-Dryer Section ").Predrying section PDS is made up of a plurality of steam-heated drying drum Z respectively with back dryer section ADS.The drying drum Z that a plurality of orders are provided with is respectively together at driven unit PDS_m-1, PDS_m, SP, ADS_1, ADS_2, among the ADS_n with identical speed drive, that is, the drying drum Z of for example predrying section PDS is at m driven unit PDS_m-1, and the drying drum Z of driving and back dryer section ADS is at n driven unit ADS_1 among the PDS_m, ADS_2 drives among the ADS_n.
At the dry component PDS of paper machine, paper tape PB is dried to definite final moisture content from initial humidity among the ADS.Because paper tape PB changes its characteristic at this, elastic modelling quantity for example, it directly depends on water capacity, so single dry component PDS, the speed of ADS must adapt to dry profile, be used to guarantee be with uniformly stress σ (being also referred to as tensile force of belt), it is for the mass parameter and the stable no less important (do not have hyperextension as far as possible, still less tear) that moves for band of product.
By calculating at least one given theory band stress σ to setting necessary length velocity relation according to solution of the present invention.Needn't be at this theoretical band stress σ at whole predrying section and back dryer section PDS, constant among the ADS, but must be at single driven unit PDS_m-1, PDS_m, SP, ADS_1, ADS_2 changes between the ADS_n,, adapts to dry run that is, and this process is accompanied by contraction.
Tensile force of belt σ PDS_m in the last driven unit PDS_m back of predrying section PDS of glue laminated machine SP front is setting in the loop and concern v_SP/v_PDS_m setting, the i.e. velocity ratio of driven unit SP and PDS_m by given speed.Band humidity u_PDS_m occurs as measured value.In setting the loop, concern v_ADS_1/v_SP, be that the quick ratio of driven unit ADS_1 and SP is set in the tensile force of belt σ ADS_0 of the first driven unit ADS_1 front of dryer section ADS afterwards similarly by given speed.By the band humidity u_PDS_m that records and in glue laminated machine SP usually known water apply and can calculate band humidity u_ADS_0.(for example can determine that the water among the glue laminated machine SP applies by the new water consumption of glue laminated machine SP.)
Set all driven unit PDS_m-1 that determine by the band humidity of calculating with drying model similarly, PDS_m, ADS_1, ADS_2, the length velocity relation between the ADS_n advantageously makes single driven unit PDS_m-1 thus, PDS_m, ADS_1, ADS_2, the speed of ADS_n automatically adapts to the variation in the dry profile of paper tape PB.Prevent thus with the reliability of tearing and also improve with same good paper quality thus paper machine with flutter.
Fig. 2 illustrates elastic modulus E and the relation of being with humidity u.So-called in order to utilize " E-modulus-model " tries to achieve characteristic curve E (u), determine some A and B, wherein the A representative directly in the humidity of glue laminated machine SP front and band elasticity (=drying) and B representative directly in the humidity of glue laminated machine SP back and band elasticity (=moistening).At this band humidity u_ADS_0 that records the band humidity u_PDS_m of glue laminated machine SP front and apply calculating glue laminated machine SP back by the water among the known usually glue laminated machine SP.In order to determine the E value of subordinate, also record the band stress σ of glue laminated machine SP front and back and by the driven unit PDS_m that participates in, SP, the speed of ADS_0 determines to be with the strain of PB.(can select characteristic curve according to this accompanying drawing as laboratory measurement, enough constant) if this characteristic of paper tape keeps.
According to E-modulus-model, characteristic curve extends in the scope of representing by hacures during paper tape PB passes predrying section PDS, glue laminated machine SP and back dryer section ADS, as what represent in the details loop graph.The state of paper tape PB in E (u) line chart at first extends to an A from a B during predrying section PDS, because the band humidity u_PDS of subordinate reduces continuously.During passing glue laminated machine SP corresponding area humidity u_SP increase again and at last with humidity u_ADS in the dryer section ADS of back, reducing again-corresponding to the motion of the state from A to B and return again.
Can in next step, corresponding given theory band stress σ calculating be with strain stress by means of the elastic modulus E that utilizes described model to determine now with the relation (or selecting to utilize the laboratory characteristic curve) of band humidity u, as shown in next accompanying drawing.
Fig. 3 illustrates band stress σ and the relation of band strain stress for different band humidity u.Only begin with band humidity u1 at initial point corresponding to the ray of different band humidity u at this for the situation of the paper tape PB of drying.Known, when humidity u variation, paper tape PB changes on length and width at unstress state (σ=0).Length at machine direction tape loading PB increases, if begin paper tape PB is carried moisture content from " adiabatic drying (atro) ", is exactly this situation in glue laminated machine SP for example.This in the accompanying drawings the band strain stress by depending on humidity no state of tension-ε (σ=0, u1), ε (σ=0, u2) ... expression, wherein u4＞u3＞u2＞u1.Dotted line be Fig. 2 at the band humidity u_PDS_m of an A with at the ray of the humidity u_ADS_0 of a B.
In order to try to achieve the band strain stress of corresponding given theory band stress σ, only also need determine to be subordinated to the band strain stress of theoretical band stress σ now for corresponding band humidity u, represent by an arrow in the accompanying drawings as this point.Can calculate single driven unit PDS_m-1 by these band strain stress separately, PDS_m, ADS_1, ADS_2, the length velocity relation between the ADS_n and stipulate to drive controlling as theoretical value.Can so automatically set driven unit PDS_m-1 in this way, PDS_m, ADS_1, ADS_2, the length velocity relation between the ADS_n makes the band stress σ both not too high (danger that band is torn) of paper tape PB also not too low (danger of band flutter).
In a word, the present invention relates to paper machine, have at least one and have predrying section of at least one driven unit, wherein driven unit has the drying drum that at least one is used for dry paper tape.In order automatically to determine the length velocity relation between the driven unit, advise that a kind of method has following step:
-provide the speed of measured value, especially driven unit measured value, paper tape unit are quality measured value, at the measured value of the moisture measurement of predrying section last drying drum back and/or the measured value of the steam pressure in the drying drum,
-calculate the band humidity of the paper tape of each drying drum back by measured value,
-by the elastic modelling quantity that depends on humidity and at least one the band strain of at least one given theory band Stress calculation, and
-calculate length velocity relation by described at least one band strain.
By according to solution of the present invention, the length velocity relation of the variation between the driven unit of automatically determining to cause for uniform band strain by the variation in the moisture curve.
Claims (7)
1. driven unit (PDS_m-1 who is used for determining paper machine, the method of the length velocity relation PDS_m), wherein paper machine has at least one and has at least one driven unit (PDS_m-1, PDS_m) predrying section (PDS), and the driven unit (PDS_m-1 of wherein predrying section (PDS), PDS_m) have at least one drying drum that is used for dry paper tape (PB) (Z) respectively, described method has following step:
-measured value is provided, especially driven unit (PDS_m-1, the measured value of the quality of the unit are of the measured value of speed PDS_m), paper tape (PB), at the measured value of the moisture measurement of last drying drum (Z) back of predrying section (PBS) and/or the measured value of the steam pressure in the drying drum (Z)
-calculate the band humidity (u) of the paper tape (PB) of each drying drum (Z) back by described measured value,
-calculate at least one band strain (ε) by elastic modelling quantity that depends on humidity (E) and theory band stress (σ) that at least one is given, and
-by described at least one band strain (ε) computational speed relation.
2. the method for claim 1, wherein said paper machine has glue laminated machine (SP) and back dryer section (ADS), they have at least one driven unit (SP respectively, ADS_1, ADS_2, ADS_n), driven unit (the ADS_1 of dryer section (ADS) wherein, ADS_2 ADS_n) has at least one drying drum that is used for dry paper tape (PB) (Z), and
-wherein provide glue laminated machine (SP) and the back dryer section (ADS) driven unit (SP, ADS_1, ADS_2, the measured value of speed ADS_n), at the measured value of the mass flow of measured value, institute's coating adhesive amount of the moisture measurement of last drying drum (Z) back of back dryer section (ADS) and the measured value that the water in the glue laminated machine (SP) applies
-wherein apply and calculate in glue laminated machine (SP) and the back band humidity (u_ADS_0) between the dryer section (ADS) by the moisture measurement of last drying drum (Z) back of predrying section (PDS) and water.
3. method as claimed in claim 2, wherein by band humidity (u), band stress (σ) that each is measured in glue laminated machine (SP) front and back and by the driven unit (PDS_m that participates in, SP, strain (ε) the calculating elastic modulus (E) that speed ADS_1) is determined.
4. the method according to any one of the preceding claims is wherein automatically set driven unit (PDS_m-1, PDS_m, SP, ADS_1, ADS_2, ADS_n) length velocity relation between.
5. paper machine, have at least one and have at least one driven unit (PDS_m-1, PDS_m) predrying section (PDS), wherein said driven unit (PDS_m-1, PDS_m) have at least one drying drum that is used for dry paper tape (PB) (Z), described paper machine also has the mechanism that is used for carrying out as claim 1 to 4 method as described in each.
6. computer program is used for carrying out on paper machine as claimed in claim 5 and carries out as each described method of claim 1 to 4.
7. computer program has computer program as claimed in claim 6.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008030340.2A DE102008030340B4 (en) | 2008-06-26 | 2008-06-26 | Determination of speed relations between drive groups of a paper machine |
| DE102008030340.2 | 2008-06-26 | ||
| PCT/EP2009/056241 WO2009156235A2 (en) | 2008-06-26 | 2009-05-22 | Determination of speed relations between driving groups of a paper machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102076906A true CN102076906A (en) | 2011-05-25 |
| CN102076906B CN102076906B (en) | 2012-07-11 |
Family
ID=41360321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009801242429A Active CN102076906B (en) | 2008-06-26 | 2009-05-22 | Determination of speed relations between driving groups of a paper machine |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP2304103B1 (en) |
| CN (1) | CN102076906B (en) |
| DE (1) | DE102008030340B4 (en) |
| ES (1) | ES2643995T3 (en) |
| WO (1) | WO2009156235A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106352684A (en) * | 2015-07-15 | 2017-01-25 | 卡尔迈耶罗泰尔有限责任公司 | Device and method for drying yarn sheet |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7006293B2 (en) * | 2018-01-18 | 2022-01-24 | セイコーエプソン株式会社 | Fiber processing equipment |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5638611A (en) * | 1995-10-18 | 1997-06-17 | Voith Sulzer Papiermaschinen Gmbh | Single-tier drying section tailored for compensating stretching and shrinking of paper web |
| CN1156196A (en) * | 1995-10-18 | 1997-08-06 | 沃伊斯·萨尔泽造纸机械股份公司 | Single row type drying section for paper size expanding and contracting compensation |
| US6200422B1 (en) * | 1999-06-24 | 2001-03-13 | Neles Paper Automation Oy | Method and apparatus for controlling a moving paper web |
| FI121081B (en) * | 2002-01-08 | 2010-06-30 | Metso Paper Automation Oy | Method and equipment associated with a paper machine or paper finishing device |
| DE102004018522A1 (en) * | 2004-04-14 | 2005-11-03 | Voith Paper Patent Gmbh | paper machine |
| DE102005058142A1 (en) * | 2005-12-06 | 2007-06-21 | Voith Patent Gmbh | Method for determining a stretching property of a paper web |
-
2008
- 2008-06-26 DE DE102008030340.2A patent/DE102008030340B4/en not_active Expired - Fee Related
-
2009
- 2009-05-22 CN CN2009801242429A patent/CN102076906B/en active Active
- 2009-05-22 WO PCT/EP2009/056241 patent/WO2009156235A2/en active Application Filing
- 2009-05-22 EP EP09769084.6A patent/EP2304103B1/en active Active
- 2009-05-22 ES ES09769084.6T patent/ES2643995T3/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106352684A (en) * | 2015-07-15 | 2017-01-25 | 卡尔迈耶罗泰尔有限责任公司 | Device and method for drying yarn sheet |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102008030340A1 (en) | 2009-12-31 |
| DE102008030340B4 (en) | 2017-06-08 |
| CN102076906B (en) | 2012-07-11 |
| WO2009156235A2 (en) | 2009-12-30 |
| EP2304103B1 (en) | 2017-07-19 |
| WO2009156235A3 (en) | 2010-02-18 |
| ES2643995T3 (en) | 2017-11-27 |
| EP2304103A2 (en) | 2011-04-06 |
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Effective date of registration: 20220407 Address after: Munich, Germany Patentee after: Siemens energy global Corp. Address before: Munich, Germany Patentee before: SIEMENS AG |