EP1416084A1 - Systèm et procédé d'alimentation d'une caisse de tête - Google Patents

Systèm et procédé d'alimentation d'une caisse de tête Download PDF

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Publication number
EP1416084A1
EP1416084A1 EP03022309A EP03022309A EP1416084A1 EP 1416084 A1 EP1416084 A1 EP 1416084A1 EP 03022309 A EP03022309 A EP 03022309A EP 03022309 A EP03022309 A EP 03022309A EP 1416084 A1 EP1416084 A1 EP 1416084A1
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EP
European Patent Office
Prior art keywords
dilution
headbox
dilution liquid
liquid
fiber suspension
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP03022309A
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German (de)
English (en)
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EP1416084B1 (fr
Inventor
Karl-Heinz Beuermann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
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Voith Paper Patent GmbH
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Publication date
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Publication of EP1416084A1 publication Critical patent/EP1416084A1/fr
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Publication of EP1416084B1 publication Critical patent/EP1416084B1/fr
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/26—De-aeration of paper stock
    • 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
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water

Definitions

  • the invention relates to a stock feed system for feeding a fiber suspension to at least one single or multi-layer headbox, with or without further dilution device, a paper or Carton machine with at least one first dilution device, in particular predilution device, and at least one second Dilution device, in particular post-dilution device, for diluting the fiber suspension with a dilution liquid, in particular water, and at least one device for, in particular largely complete, deaeration of the fiber suspension and the dilution liquid.
  • the invention relates to a method for feeding a Fibrous suspension to at least one single or multi-layer Headbox, with or without further dilution device, a paper or Cardboard machine in which the fiber suspension is at least a first dilution, in particular predilution, and at least a second dilution, in particular post-dilution, with a Dilution liquid, especially water, is subjected to and which the fiber suspension and the dilution liquid, in particular largely completely, be vented.
  • Such stock delivery systems and methods of operating the same are basically known.
  • the principle of pre- and post-dilution is described in Connection with cleaning systems (cleaners) and preferably for large ones Headbox quantity variations and relatively low headbox densities applied.
  • cleaning systems cleaners
  • Headbox quantity variations and relatively low headbox densities applied There is a big difference between the consistency in the cleaning system and in the headbox desirable because this is a offers great control potential in the operation of the stock feed system.
  • the predilution allows the feed density to be determined in a first For example, set the cleaner level to approximately 0.9% to 0.95% at experience has shown that the cleaning facility operates effectively is possible and a good cleaning result is achieved. Through the Subsequent post-dilution can then change the consistency to the desired one Headbox density of, for example, approximately 0.65% or, im In case of a further dilution in the headbox itself of approx. 1% for example, about 0.75% can be set.
  • the amount and consistency of the fiber suspension in the post-dilution cycle flexibly adjusted and on the other hand the cleaner system operated with an optimal consistency.
  • the invention has for its object a stock feed system and a Process of the type mentioned with pre- and post-dilution of the Material suspension and in particular with complete ventilation of the material flow to create the headbox, which also provides stable operation ensure larger headbox quantity and stock density variations and can be used flexibly.
  • the stock feed system according to the invention is particularly distinguished characterized in that for the ventilation of the already diluted fiber suspension on the one hand and the dilution liquid for the second dilution, on the other hand, separate ventilation devices are provided are.
  • the pre-diluted fiber suspension and the dilution liquid for post-dilution is therefore separated vented from each other.
  • the usage will be different Dilution liquids, especially different deaerated liquids Water qualities for the first dilution, e.g. pre-dilution, the second dilution in the main strand, for example post-dilution, and optionally a further dilution in the headbox allows.
  • the stock feed system according to the invention comes as a whole a high degree of flexibility too. It is both before single layer also in front of multilayer headboxes with or without dilution water technology as well as in separate or connected stock feed systems for multiple headboxes in the production of multi-ply papers or Cartons applicable.
  • a defined one Mixing point provided.
  • the post-dilution of the fiber suspension does not take place according to the invention by adding the dilution liquid in a ventilation container for the fiber suspension, it takes place in a specially designed, defined mixing point instead of. Due to the defined mixing of deaerated material suspension and separately vented diluent is a stable one Operation of the stock feed system even with larger headbox quantities and Variations in consistency guaranteed. It can be defined by a Introduction of fiber suspension and dilution liquid into the Mixing point a desired mixing ratio or one Desired dilution of the fiber suspension slightly in and be ensured. In addition, through the defined mixing point a homogeneous mixture of fiber suspension and dilution liquid guaranteed.
  • the mixing point between a first, preferably volume-controlled pump for injecting the deaerated fiber suspension into the mixing point and a second pump, especially a headbox pump, for removing the diluted, especially post-diluted Fibrous suspension from the mixing point is arranged such that depending on the delivery capacity of the first and second pumps automatically the amount of dilution liquid flowing into the mixing point for the second dilution.
  • the dilution of the fiber suspension is therefore self-regulated, which means that it is not additional control device for the incoming dilution liquid required.
  • the amount of diluent flowing in depends solely on the amount of the feed to the mixing point and fiber suspension withdrawn from the mixing point. The number too According to the invention, controlling process parameters are thus increased by one Reduced parameters, which reduces the monitoring effort.
  • separate containers can be provided for the second dilution.
  • a supply line between the venting device of the dilution liquid for the second dilution and the dilution device of the Headbox provided through which the dilution device of the Headbox with vented diluent is available.
  • the dilution liquid can be used for the second dilution at the same time for a further dilution of the fiber suspension in the Headbox, i.e. for a third dilution, can be used.
  • a further separate venting device is preferably provided for the headbox dilution liquid is provided.
  • a common vacuum system is provided for the second dilution. This allows the space requirement and the investment and Reduce system operating costs even further.
  • the cleaning device can have one or more cleaning stages.
  • the system the pre- and post-dilution can then be used particularly well, when working with cleaning devices that have an increased consistency tolerated, namely up to about 2%.
  • the system with pre and post thinning at a consistency in Headbox operated up to about 1.7%.
  • Post-dilution in a wide range in the production of the most varied Papers and cartons can be applied. This applies to both for systems with as well as for systems without ventilation.
  • the invention The material feed system can therefore be used particularly flexibly. simultaneously can significantly reduce investment costs, space requirements and energy are achieved, that is, the economy of the stock feed system increase.
  • FIG. 1 is a schematic illustration of a first embodiment of the stock feed system according to the invention. Using a feed line 10, a fiber suspension is fed to a first mixing point 12.
  • the first mixing point 12 serves for a first dilution of the fiber suspension, a so-called predilution.
  • the predilution of the fiber suspension can optionally be carried out by a Overflow liquid that flows through a line 14 from a venting device 16 for the fiber suspension is fed through an overflow liquid, via a line 18 from a venting device 20 for a post-dilution liquid, or through white water respectively.
  • a Overflow liquid that flows through a line 14 from a venting device 16 for the fiber suspension is fed through an overflow liquid, via a line 18 from a venting device 20 for a post-dilution liquid, or through white water respectively.
  • the 24 white water can be supplied via a supply line.
  • the fiber suspension is over a line 32 into the vent container 33 of the venting device 16 initiated for the fiber suspension.
  • Suitable for this Venting or degassing devices are adequate known and for example in EP 1 091 040 A2 or EP 0 501 144 A1 described.
  • the pulp suspension is vented by a generated by means of a vacuum system 34 in the vent container 33 Vacuum. In particular, this is a largely complete one Venting.
  • the vent container 33 for the fibrous suspension has an overflow arrangement 36, which is connected to line 14, via which as described above, overflow liquid of the first mixing point 12 can be supplied.
  • an outlet 38 is provided, to which a main line 40 for Withdrawing the deaerated fiber suspension from the deaeration tank 33 is connected.
  • a second pump 42 connected to the main line 40 the flowing through the main strand line 40, prediluted and deaerated fiber suspension for a second dilution, a so-called Post-dilution, injected into a second mixing point 44.
  • the post-dilution of the fiber suspension in the second mixing point 44 takes place by mixing with a deaerated second dilution liquid, in the illustrated case with deaerated white water.
  • venting the second dilution liquid i.e. the White water
  • a separate venting device 20 with a separate one Vent container 46 provided, that is, the venting of the Pulp suspension and the venting of the post-dilution liquid take place separately.
  • the one intended for post-dilution and white water to be vented is the vent tank 46 via a Line 48 supplied from the white water tank 22.
  • a similar venting device can be used for the white water be like for the ventilation of the fiber suspension.
  • venting devices of this type are known. she are therefore not explained further here.
  • the deaeration of the Post-dilution liquid through a in the vent tank 46 generated vacuum.
  • the same vacuum system is used for vacuum generation 34 used, which is also provided for venting the fiber suspension is.
  • the vent tank 46 for the white water has an overflow arrangement 50, which is connected to line 18, via which of the first Mixing point 12 at least optionally vented white water for pre-dilution the fiber suspension can be fed.
  • a first outlet 52 is also provided, to which a supply line 54 is connected. Through the supply line 54 can be vented dilution water from the vent tank 46 in the second mixing point 44 for post-dilution of the Flowing in the fiber suspension.
  • the pulp suspension which is now rediluted, is removed by a headbox pump 56 withdrawn from the second mixing point 44 and over a main line 58 is fed to a headbox, not shown.
  • the second pump 42 and the headbox pump 56 are volume-controlled, the delivery capacity of the headbox pump 56 greater than that of the first pump 42 and for example at least 1500 to 2000 1 / min is.
  • the inflow amount of the deaerated post-dilution water into the second mixing point 44 is regulated passively, that is, it turns depending Control of the delivery rates of the second pump 42 and the headbox pump 56 automatically. In this way not only the fiber suspension defined injected into the mixing point 44, but also the Dilution liquid supplied in a controlled manner. In the mixing point 44 thus a defined mixing of fiber suspension and Dilution water, i.e. a defined post-dilution of the stock suspension.
  • a second outlet 60 provided by means of a pump 62 via a supply line 64 of a further dilution device, not shown here deaerated dilution water for further dilution of the fiber suspension can be fed into the headbox.
  • the stock feed system according to the invention is described as follows operated.
  • An appropriately prepared fiber suspension is diluted in the mixing point 12, for example with white water, in particular pre-diluted.
  • the diluted fiber suspension is then through the Cleaner system 30 passed, cleaned in this and finally in one Venting device 16, in particular completely, vented.
  • Parallel the dilution liquid for the second dilution is separately the fiber suspension, in particular completely, deaerated.
  • the vented Pulp suspension and the deaerated dilution liquid in the second mixing point 44 defines what is mixed together a second dilution, in particular post-dilution, of the fiber suspension leads.
  • the now diluted again, especially post-diluted, Fibrous suspension is then by means of the headbox pump 56 fed to the headbox, where appropriate, if necessary one more time is diluted.
  • Mass feed systems are largely similar to those above explained first embodiment. To identify the same characteristics the same reference numerals are therefore used. With the others Embodiments are also only the differences to the previous embodiments highlighted.
  • the second embodiment of the invention shown in FIG. 2 The stock feed system differs from the first shown in FIG. 1 Embodiment only in that the ventilation device 16 for the pulp suspension and the venting device 20 for the post-dilution liquid have a common venting container 66, through a partition 68 into a first ventilation compartment 70 for the pulp suspension and in a second ventilation compartment 72 for the Dilution water is divided.
  • Each compartment 70, 72 each has an overflow arrangement 36 or 50 on.
  • the vacuum in Vent tank 66 is created by vacuum system 34, wherein one for connecting the container 66 to the vacuum system 34 Vacuum line 74 is sufficient.
  • the third embodiment of the invention shown in FIG. 3 The stock feed system differs from the first shown in FIG. 1 Embodiment in that the vent container 46 of the vent device 20 for the post-dilution liquid in its bottom area has only one outlet 52. At this outlet 52 is the supply line 54 is connected to the second mixing point 44 for post-dilution of the fiber suspension with deaerated post-dilution liquid to supply.
  • the dilution liquid to be vented is supplied to the venting device 20 via a line 76.
  • the dilution liquid is preferably also in this embodiment White water, so that line 76 the vent tank 46 can connect to the white water tank 22, for example. It is but also conceivable, a liquid other than post-dilution liquid to be used, such as sewage water or fresh water.
  • venting device 78 provided one of the vent containers 33, 46 of the fiber suspension and post-dilution liquid separated Vent tank 80 has.
  • This third vent 78 serves to vent an additional dilution liquid, those for a further dilution of the fiber suspension in the not shown Headbox is provided.
  • This venting device 78 also can be of a known type.
  • the additional dilution liquid becomes the vent tank 80 supplied via a line 82.
  • the dilution liquid it can white water, sewage water or water of a different quality act with line 82 having a suitable water reservoir, not shown is connected, for example, in the case of white water the white water tank 22.
  • the venting of the additional dilution liquid in the vent container 80 as well as the venting the pulp suspension and the venting of the post-dilution liquid by creating a vacuum in the vent tank 80.
  • the same vacuum system 34 is used for vacuum generation, which is also used to deaerate the fiber suspension and the post-dilution liquid serves.
  • the vent container 80 has an overflow arrangement 84 through the overflow of the at least partially deaerated dilution liquid Removable from the container 80 and via an overflow line 86 a dilution liquid reservoir, not shown, or for example the first mixing point 12 for predilution of the fiber suspension is feedable.
  • venting container 80 88 There is also a spout in the bottom area of the venting container 80 88 is provided, to which a supply line 90 is connected.
  • a pump 92 By means of a pump 92 is via the outlet 88 and the supply line 90 especially completely vented dilution liquid the vent container 80 and, for example, a third Dilution device for further dilution of the already diluted Fiber suspension can be fed into the headbox.
  • the fourth embodiment of the invention shown in FIG. 4 differs from the third shown in FIG. 3 Embodiment in that the ventilation device 16 for the Fibrous suspension, the venting device 20 for the post-dilution liquid and vent 78 for the additional Dilution liquid a common vent tank 94th have, which by two partitions 68, 96 in a first compartment 70 for the pulp suspension, a second compartment 72 for the post-dilution liquid and a third compartment 98 for the additional dilution liquid is divided.
  • Each of the three compartments 70, 72, 98 has the respective Feed lines 32, 48, 82, overflow arrangements already described above 36, 50, 84 and outlets 38, 52, 88.
  • the common one Vent tank 94 of all three venting devices 16, 22, 78 is to generate the vacuum required for ventilation via a Vacuum line 100 connected to the common vacuum system 34.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
EP03022309A 2002-10-31 2003-10-02 Système et procédé d'alimentation d'une caisse de tête Expired - Lifetime EP1416084B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10250865 2002-10-31
DE10250865A DE10250865B3 (de) 2002-10-31 2002-10-31 System und Verfahren zur Zuführung einer Faserstoffsuspension zu einem Stoffauflauf

Publications (2)

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EP1416084A1 true EP1416084A1 (fr) 2004-05-06
EP1416084B1 EP1416084B1 (fr) 2007-03-07

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EP03022309A Expired - Lifetime EP1416084B1 (fr) 2002-10-31 2003-10-02 Système et procédé d'alimentation d'une caisse de tête

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EP (1) EP1416084B1 (fr)
CN (1) CN1499009A (fr)
AT (1) ATE356249T1 (fr)
DE (2) DE10250865B3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005005716A1 (fr) * 2003-07-09 2005-01-20 Sulzer Pumpen Ag Procede et arrangement pour le traitement de pate
EP2988843B1 (fr) * 2013-04-26 2018-06-13 Voith Patent GmbH Dégazage de suspensions

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004042341B4 (de) * 2004-09-01 2007-04-12 Voith Patent Gmbh System und Verfahren zur Zuführung einer Faserstoffsuspension zu einem Stoffauflauf
CN107913606B (zh) * 2017-10-24 2020-07-28 浙江福斯特新材料研究院有限公司 一种半透膜支撑材料及其制备方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3432036A (en) * 1964-12-09 1969-03-11 Clark & Vicario Corp Conditioning papermaking stock
DE10050109A1 (de) * 2000-10-09 2002-04-11 Voith Paper Patent Gmbh Verfahren und Mischvorrichtung zur Erzeugung einer fertigen Faserstoffsuspension

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4106140C2 (de) * 1991-02-27 1994-11-24 Escher Wyss Gmbh Vorrichtung und deren Anwendung zur Entlüftung einer Papierstoffsuspension
FI103677B (fi) * 1998-06-10 1999-08-13 Valmet Corp Menetelmä osamassan annostelusäiliön pinnankorkeuden ja sakeuden säätä miseksi
DE19947905A1 (de) * 1999-10-06 2001-04-12 Voith Paper Patent Gmbh Vorrichtung zum Engasen von Faserstoffsuspensionen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3432036A (en) * 1964-12-09 1969-03-11 Clark & Vicario Corp Conditioning papermaking stock
DE10050109A1 (de) * 2000-10-09 2002-04-11 Voith Paper Patent Gmbh Verfahren und Mischvorrichtung zur Erzeugung einer fertigen Faserstoffsuspension

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005005716A1 (fr) * 2003-07-09 2005-01-20 Sulzer Pumpen Ag Procede et arrangement pour le traitement de pate
EP2988843B1 (fr) * 2013-04-26 2018-06-13 Voith Patent GmbH Dégazage de suspensions

Also Published As

Publication number Publication date
DE50306732D1 (de) 2007-04-19
EP1416084B1 (fr) 2007-03-07
CN1499009A (zh) 2004-05-26
ATE356249T1 (de) 2007-03-15
DE10250865B3 (de) 2004-05-13

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