EP0893537A2 - Système de formation d'une bande - Google Patents

Système de formation d'une bande Download PDF

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Publication number
EP0893537A2
EP0893537A2 EP98108653A EP98108653A EP0893537A2 EP 0893537 A2 EP0893537 A2 EP 0893537A2 EP 98108653 A EP98108653 A EP 98108653A EP 98108653 A EP98108653 A EP 98108653A EP 0893537 A2 EP0893537 A2 EP 0893537A2
Authority
EP
European Patent Office
Prior art keywords
air
jet
free jet
sheet formation
speed
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.)
Withdrawn
Application number
EP98108653A
Other languages
German (de)
English (en)
Other versions
EP0893537A3 (fr
Inventor
Volker Schmidt-Rohr
Alfred Dr. Bubik
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
Original Assignee
Voith Sulzer Papiermaschinen GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from DE29713245U external-priority patent/DE29713245U1/de
Application filed by Voith Sulzer Papiermaschinen GmbH filed Critical Voith Sulzer Papiermaschinen GmbH
Publication of EP0893537A2 publication Critical patent/EP0893537A2/fr
Publication of EP0893537A3 publication Critical patent/EP0893537A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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

Definitions

  • the invention relates to a sheet formation system Paper or board machine according to the preamble of Claim 1.
  • the inventors have recognized that the roughening in Free jet area not only on internal turbulence based on the free jet, but that an essential one The reason for this roughening in the air friction of the Free jet to the surrounding air.
  • the roughening of the free jet can be significantly reduced if one ensures that the air in the area of the Free jets the same speed and same Direction of the free jet, so that none Friction at the boundary layer between air and suspension can arise. This can be done in that a targeted air flow is generated which Free jet embeds and their speed and Direction coincides with the free jet.
  • the invention proposes to improve one Sheet formation system of a paper or Cardboard machine with a headbox over a Jet a stock suspension jet onto a sieve or between two sieves, to the effect that funds are provided which in Area of the free jet of the material suspension Generate air flow in their direction in the essentially with the direction of the free jet matches and their speed at least 90% corresponds to the jet speed.
  • this can be done by that in the area of the headbox nozzle machine-wide, on at least one side of the nozzle, another air nozzle is provided, the one Air jet generated with the material jet is rectified.
  • This version can also be further developed be that additional air baffles are provided, which is the deflected air boundary layer of the sieves again divert in the direction of the free jet.
  • a further development of the inventive concept can lie in the area of the beam entry point a device for suction of the free jet provided air boundary layer.
  • a device for suction of the free jet provided air boundary layer can be, for example, the Breast roll, which is designed as a suction roll, in Seen machine direction, initially over an air suction sector, which a water suction sector follows.
  • the idea of the invention can also be thereby realize a multi-layer headbox like this is used that at least one of the outer Layers is operated with air, and thus the Suspension jet, right at the beginning of its exit from the headbox, with a rectified Air cushion is surrounded.
  • Figure 1 shows a sheet formation system with a Single-layer headbox 1, which is its stock suspension into the inlet gap between a first screen 2 and a feeds the second sieve 3.
  • the first sieve 2 is through a deflection roller 4 designed as a suction roller deflected, the deflecting roller 4 via a first Suction zone 4.1 and a second suction zone 4.2.
  • the second overhead screen 3 is over the deflecting roller 5th deflected and then led to a suction box 6.
  • the suction box 6 starts directly behind the roller 5 and also has a first suction zone 6.1, for Suction of the air layer, and a second suction zone 6.2 for drainage.
  • the headbox 1 has the top of its nozzle area and below two more air nozzles 1.1 and 1.2, which only be fed with air and for that ensure that the suspension jet, that of the nozzle of the Headbox comes from both sides with one Air cushion is provided, its speed and Direction of speed and essentially Direction of the suspension beam corresponds.
  • FIG. 2 shows a further development of the Sheet formation system of Figure 1.
  • the further one Execution and functioning of this Sheet formation system corresponds to that in FIG. 2 described.
  • FIG 3 shows a further development of Sheet formation system on Figure 3.
  • each further baffles 8.1 and 8.2 attached which ensure that the through the guide plates 7.1 and 7.2 deflected air boundary layer of the upper and lower sieve air nozzle 1.1 or 1.2 is introduced and specifically as an air cushion for the Material suspension jet is used.
  • FIG. 4 shows another according to the invention Embodiment of a sheet formation system, with a Single-layer headbox 1.
  • the single-layer headbox 1 puts its stock onto the surface of a the underlying sieve 2, which is connected to a roller 4 is redirected to.
  • the roller 4 has one Suction sector 4.1 for extracting white water.
  • a baffle 7.2 attached to the air boundary layer of the sieve 2 distract and an entry of this air boundary layer into the gap between roller 4 and headbox 1 prevent.
  • the headbox 1 still has on the top its nozzle via an additional air-guiding nozzle 1.1, which ensures that the expelled air in the area of the exit of the stock suspension from the Headbox with the same speed and direction emotional.
  • the nozzle 1.1 is designed so that it in their further course simultaneously as a baffle 7.1 for the air boundary layer through the sieve 3 is introduced, serves.
  • the sieve 3 is through a Guide roller 5 deflected and onto the screen 2, which the Suspended stock, laid on.
  • the roller 5 has in the area between the guide plate 7.1 and the contact with the sieve 2 below via a suction zone 5.1, through which the air introduced through the nozzle 1.1 is sucked off and thus an overpressure in this Area is avoided.
  • the further course of the two Sieves correspond to the state of the art.
  • Figure 5 shows the use of a Multi-layer headbox 10 with an upper one Section 10.1, a middle section 10.2 and one lower section 10.3.
  • the three sections used, one three-layer Generate paper layer.
  • the two outer layers 10.1 and 10.3 instead of with Stock suspension operated with air. That is, the middle section 10.2, which continues with Stock suspension is fed from both sides with a rectified and surrounded by speed-conforming air cushions.
  • This Fabric suspension layer with air cushions on both sides is surrounded, is placed on the lower sieve 2.
  • the Sieve 2 is in the area of the headbox Roller 4 deflected and passed on to a roller 5.
  • the roller 5 deflects the upper screen 3 and brings the two screens 2 and 3 together.
  • Both the Roller 5, as well as the roller 4 have a Suction zone 4.1, 5.1, over which the brought up Air cushions of the fabric suspension layer are extracted becomes.
  • the use of the multi-layer headbox is not on the type of execution of the given example limited, but can be with everyone in the state of the art Technology known execution of a Sheet formation system can be realized. In particular can use this type of multilayer headbox also in connection with gap formers or with multi-sieve arrangements.

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  • Paper (AREA)
EP98108653A 1997-07-25 1998-05-13 Système de formation d'une bande Withdrawn EP0893537A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE29713245U 1997-07-25
DE29713245U DE29713245U1 (de) 1997-07-25 1997-07-25 Blattbildungssystem
DE19747300A DE19747300A1 (de) 1997-07-25 1997-10-25 Blattbildungssystem
DE19747300 1997-10-25

Publications (2)

Publication Number Publication Date
EP0893537A2 true EP0893537A2 (fr) 1999-01-27
EP0893537A3 EP0893537A3 (fr) 1999-12-15

Family

ID=26041113

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98108653A Withdrawn EP0893537A3 (fr) 1997-07-25 1998-05-13 Système de formation d'une bande

Country Status (1)

Country Link
EP (1) EP0893537A3 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR697157A (fr) * 1929-06-08 1931-01-13 Voith Gmbh J M Arrivée de la pâte pour des machines à papier à table plate et machines analogues
SE431663B (sv) * 1982-07-06 1984-02-20 Karlstad Mekaniska Ab Forfarande och anordning for avgivande av en flerskiktsmeldstrale till en formningsyta i en pappersmaskin
FI81400C (fi) * 1984-10-25 1990-10-10 Valmet Oy Foerfarande och anordning i en pappersmaskin i kilutrymmet mellan inloppslaodans laeppbalk och broestvalsen.
DE3802298A1 (de) * 1987-06-09 1988-12-22 Peter G Mercer Verfahren und vorrichtung zum verbessern der homogenitaet der faserverteilung beim maschinellen herstellen einer faserstoffbahn
DE19705592A1 (de) * 1997-02-14 1998-08-20 Voith Sulzer Papiermasch Gmbh Vorrichtung und Verfahren zur Bildung einer Papierstofflage

Also Published As

Publication number Publication date
EP0893537A3 (fr) 1999-12-15

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