EP1586702A1 - Section de formage à deux toiles pour machine de fabrication d'une bande de matériau fibreux - Google Patents

Section de formage à deux toiles pour machine de fabrication d'une bande de matériau fibreux Download PDF

Info

Publication number: EP1586702A1
Authority: EP; European Patent Office
Prior art keywords: twin; wire; wire former; strips; former
Prior art date: 2004-04-13
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

EP05102625A

Other languages

German (de)

English (en)

Other versions

EP1586702B1 (fr

Inventor

Volker Schmidt-Rohr

Wilfried Weiss

Stefan Löhr

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 Paper Patent 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.)

2004-04-13

Filing date

2005-04-04

Publication date

2005-10-19

2005-04-04 Application filed by Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH

2005-10-19 Publication of EP1586702A1 publication Critical patent/EP1586702A1/fr

2009-07-01 Application granted granted Critical

2009-07-01 Publication of EP1586702B1 publication Critical patent/EP1586702B1/fr

Status Not-in-force legal-status Critical Current

2025-04-04 Anticipated expiration legal-status Critical

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Classifications

- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F9/00—Complete machines for making continuous webs of paper
- D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type

Definitions

the invention relates to a twin-wire former of a machine for producing a Fiber web, in particular a paper or board web, with two circumferential endless screens, both over a peripheral area of a respective deflecting element, especially a breast roll, run, then at least until to achieve an impingement device to form a wedge-shaped Stoffeinlaufspalts, directly the at least one of a headbox than Pulp suspension jet applied pulp suspension in training each Strahlauf Economicspp receives on the two sieves, converge and which then form a twin-wire section, in which the two sieves and the at least one intermediate pulp suspension over several Forming and drainage elements are guided.
twin-wire former has been known in the art for some time and it is commonly referred to as a so-called last-gap former "(Blade-Gapformer).
the drainage of the introduced begins Fibrous suspension on a box equipped with ceramic strips, above which curved surface the two sieves converge and the first drainage takes place.
the box can, depending on the embodiment, to the environment open or closed executed. In a closed box is the application of vacuum possible. It can also be about individual ceramic strips act, which are preferably mounted on support ribs.
a disadvantage of this design is that the applied vacuum is not adjustable is and thus not independent of the sieve speed is adjustable. Of Further, even under normal operating conditions, the grooves may be more or less less quickly and heavily pollute.
the weir and the open water sump also have the disadvantage that they are the Obstruct air removal from the sieve. Furthermore sits in free flow of the box in Usually so high up that the entrained air already from the manufactured Fiber web (fiber mat) is included.
the impingement device is designed as an impingement shoe, which has a covering with several in succession direction arranged strips with intervening has free drainage holes, each with a fixed and open surface touching the rotating sieve, and the one comprehensive Box has, the box bottom so close to the upstream in the direction Sieblaufraum Breast roller is arranged that the box bottom at least partially is guided around the breast roll.
This solution enables the operation of the twin-wire former even at high levels Screening speeds ⁇ 1,500 m / min, preferably ⁇ 1,700 m / min, and at low Basis weights, without water streaks and / or bright spots in the produced fibrous web occur.
twin-wire former according to the invention can also be used in conversions of existing systems find their use, such as in conversions BelBaie shapers.
the box bottom preferably has a highest - seen in the vertical direction Point up to a vertical height in the range of 10 to 700 mm, preferably from 100 to 40 mm, above the beginning of the first in the direction of the direction of sieve free drainage hole is located.
the white water can in the box freely over the breast roll crest expire.
the strips preferably on run-side scraping edges, wherein in Sieblaufraum second and subsequent bar a respective Guiding surface, whose geometrically linear extension of the box bottom not touched on the inside. This will ensure that of the scraping edges discharged white water freely over the highest point of the box bottom is thrown and again the emergence of an open sump completely is avoided.
the strips have a width ⁇ 150 mm, preferably ⁇ 100 mm, in particular ⁇ 60 mm, on.
the open surface of the impingement shoe can also be interrupted, Machine-wide and transverse to Sieblaufraum aligned slots in the wire direction aligned herringbone slots, drilling and / or other having shaped openings, these embodiments merely by way of example Character. Other design options are obvious possible.
the Impingement shoe preferably at least one, preferably two or more curved regions with preferably different lengths, their radii in Sieblaufraum each have a greater value.
the radius of the first range preferably has a value in the range of 0.6 to 4 m, preferably from 1 to 2 m, and the radius of the second region preferably has a value in the range of 2 to 5 m, preferably 3 m, whereas the length of the The first range preferably has a value in the range of 15 to 150 mm, preferably from 70 to 120 mm, and the length of the second region preferably one Value in the range of 90 to 250 mm. These dimensions are special advantageous at high speeds.
the forming fibrous web continuously in the course of their drainage is drained more gently, the free drainage holes have different On sizes that decrease in amount preferably in Sieblaufraum.
the air contained in the pulp suspension is effectively removed, is the impingement shoe by means of at least one vacuum source with a vacuum ⁇ 0.5 kPa, preferably ⁇ 2 kPa, in particular ⁇ 5 kPa, controllable / controllable suctioned.
the removal of the air-white water mixture is effectively supported.
Impingementschuh side of the twin-wire section are advantageously arranged several strips that are flexible to the fitting Sieve are pressed and the at least partially opposite the free drainage holes can be arranged. This favors one increased removal of accumulating white water in the impingement shoe.
the twin-wire former according to the invention is suitable for all possible embodiments, so that the twin-wire section at an angle of 0 ° to 90 ° can be arranged to the horizontal.
the twin-wire former can therefore be used as a horizontal, be designed as a vertical or inclined form.
FIG. 1 shows a schematic partial side view of a twin-wire former 1 according to the known prior art.
the drainage of the introduced pulp suspension 13 begins on a box 17 equipped with ceramic strips 17.1 to 17.4 box 18, on the curved surface 19, the two wires 3, 4 converge and the first dewatering takes place.
the box 18 has at the outset a Auflautang 20 for the protection of the beam after the Strahlauf Economicsticiantician 11 3 , 14 4 .
the box 18 may, depending on the embodiment, open to the environment or closed, as shown in Figure 1, executed. In a closed box 18, the use of vacuum is possible. It may also be in unillustrated embodiment also to individual ceramic strips, which are preferably mounted on support ribs.
FIG. 2 shows a further schematic partial side view of a twin-wire former 1 according to the known prior art.
the impingement device 9 in this case comprises several in the direction S of the machine direction (arrow) arranged after the breast roll 7.1 wide ceramic strips 23 with so-called Foilrillen 24, as for example from the already mentioned German Offenlegungsschrift DE 100 84 722 T1 are known.
the means of the ceramic strips 23rd from the pulp suspension 13 discharged white water is by means of a guide 25, in particular a baffle 25.1, discharged via the breast roller 7.1.
In Sieblaufraum S (arrow) after the wide ceramic strips 23 is a with arranged a vacuum applied box 26, which in turn several ceramic strips 27.1 to 27.3 in the manner already described.
FIG. 3 now shows a schematic partial side view of an embodiment of the twin-wire former 1 according to the invention.
twin-wire former 1 With regard to the basic structure of this twin wire former 1 will turn refer to the description of the twin-wire former 1 of Figure 1.
the impingement device 9 is designed as an impingement shoe 9.1 which has a covering 28 with a plurality of strips 29.1 to 29.6 disposed successively and preferably parallel to one another in the direction of wire flow S (arrow) with free drainage openings 30.1 to 30.5 interposed therebetween, each having a stationary and open surface 31.1 to 31.6 touch the rotating sieve 3, and has a comprehensive box 32, the box bottom 33 is arranged so close to the direction in the wire direction S (arrow) upstream breast roller 7.1, that the box bottom 33 is at least partially guided around the breast roller 7.1.
the number of strips shown in Figure 1 has only exemplary character; Of course, more or fewer strips can find their use.
the first strip 29.1 in the direction of the direction of movement S (arrow) is also shown as a known casserole for supporting the screen 3 after the beam impingement point 14 3 .
the box bottom 33 has a - seen in the vertical direction - highest point B, by a vertical height H v in the range of 10 to 700 mm, preferably 100 to 400 mm, above the beginning of the S in the direction of wire direction S (arrow) first free Drainage opening 30.1 is located.
the strips 29.1 to 29.6 have run-off side scraping edges 34.1 to 34.6, wherein in the direction of wire direction S (arrow) second strip 29.2 and their subsequent strip 29.3 to 29.6 a respective guide surface 35.2 to 35.6, the geometrically linear extension V 29.2 to V 29.6 the box bottom 33 not touched on the inside.
the respective guide surface 35.2 to 35.6 is preferably arranged at an angle ⁇ ⁇ 80 °, preferably ⁇ 60 °, to the respective wire direction S (arrow) and the strips 29.1 to 29.6 have a width B 29.1 to B 29.6 (only giving the width B 29.4 ) ⁇ 150 mm, preferably ⁇ 100 mm, in particular ⁇ 60 mm.
the open surface 31 of the impingement shoe 9.1 also interrupted, machine width and transverse to Sieblaufraum S (arrow) aligned slots, aligned in the wire direction S (arrow) Herringbone slots, holes and / or differently shaped openings, in particular breakthroughs.
the impingement shoe 9.1 has two curved regions B 1 , B 2 , preferably with different lengths L 1 , L 2 , whose radii R 1 , R 2 each have a greater value in the direction of wire run S (arrow).
the radius R 1 of the first region B 1 has a value in the range of 0.6 to 4 m, preferably 1 to 2 m
the radius R 2 of the second region B 2 has a value in the range of 2 to 5 m, 3 m
the length L 1 of the first region B 1 has a value in the range of 15 to 150 mm, preferably 70 to 120 mm
the length L 2 of the second region B 2 has a value in the region of 90 up to 250 mm.
several areas with these properties may be present.
the free drainage holes 30.1 to 30.5 also have different Sizes, which decrease in terms of amount preferably in Sieblaufraum S (arrow).
the impingement shoe 9.1 by means of at least one not shown,
the vacuum source known to the person skilled in the art with a vacuum V ⁇ 0.5 kPa, preferably ⁇ 2 kPa, in particular ⁇ 5 kPa, regularly / controllably evacuated and on the Impingementschuh 9.1 opposite side of the Doppelsiebumble 15, a plurality of strips 36 are arranged, which are flexible in a known manner can be pressed against the adjacent sieve 4.
the flexible contact strips 36 are at least partially opposite the free drainage holes 30.1 to 30.5 arranged.
the two screens 3, 4 have a respective screen speed v ⁇ 1,500 m / min, preferably ⁇ 1,700 m / min, and the twin-wire section 15 is under one Angle ⁇ of 0 ° to 90 ° to the horizontal H arranged.
the inventive Twin-wire former 1 can thus be used as a horizontal, vertical or skew former be educated.
a sheet forming system a machine for producing a stain-free fibrous web with a very good formation even at high speeds is created.

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Paper (AREA)
Preliminary Treatment Of Fibers (AREA)
Nonwoven Fabrics (AREA)

EP05102625A 2004-04-13 2005-04-04 Section de formage à deux toiles pour machine de fabrication d'une bande de matériau fibreux Not-in-force EP1586702B1 (fr)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
DE102004018329		2004-04-13
DE102004018329A DE102004018329A1 (de)	2004-04-13	2004-04-13	Doppelsiebformer einer Maschine zur Herstellung einer Faserstoffbahn

Publications (2)

Publication Number	Publication Date
EP1586702A1 true EP1586702A1 (fr)	2005-10-19
EP1586702B1 EP1586702B1 (fr)	2009-07-01

Family

ID=34939119

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP05102625A Not-in-force EP1586702B1 (fr)	2004-04-13	2005-04-04	Section de formage à deux toiles pour machine de fabrication d'une bande de matériau fibreux

Country Status (3)

Country	Link
EP (1)	EP1586702B1 (fr)
AT (1)	ATE435331T1 (fr)
DE (2)	DE102004018329A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE102008040948A1 (de)	2008-08-01	2010-02-04	Voith Patent Gmbh	Doppelsiebformer für eine Maschine zur Herstellung einer Faserstoffbahn
DE102010003320A1 (de)	2010-03-26	2011-09-29	Voith Patent Gmbh	Blattbildungssystem für eine Maschine zur Herstellung einer Faserstoffbahn und dazugehöriges Verfahren

Citations (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE4141607A1 (de) *	1991-12-17	1993-06-24	Voith Gmbh J M	Doppelsiebformer
DE4208681A1 (de) *	1992-03-18	1993-09-23	Escher Wyss Gmbh	Nassteil einer doppelsieb-papiermaschine
DE19803451A1 (de) *	1998-01-30	1999-08-05	Voith Sulzer Papiertech Patent	Naßpartie und Verfahren zum Herstellen einer Faserstoffbahn
US20010025697A1 (en) *	1999-06-18	2001-10-04	Vaughn J. Wildfong	Method and apparatus for forming a paper web

2004
- 2004-04-13 DE DE102004018329A patent/DE102004018329A1/de not_active Withdrawn
2005
- 2005-04-04 EP EP05102625A patent/EP1586702B1/fr not_active Not-in-force
- 2005-04-04 AT AT05102625T patent/ATE435331T1/de active
- 2005-04-04 DE DE502005007600T patent/DE502005007600D1/de active Active

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE4141607A1 (de) *	1991-12-17	1993-06-24	Voith Gmbh J M	Doppelsiebformer
DE4208681A1 (de) *	1992-03-18	1993-09-23	Escher Wyss Gmbh	Nassteil einer doppelsieb-papiermaschine
DE19803451A1 (de) *	1998-01-30	1999-08-05	Voith Sulzer Papiertech Patent	Naßpartie und Verfahren zum Herstellen einer Faserstoffbahn
US20010025697A1 (en) *	1999-06-18	2001-10-04	Vaughn J. Wildfong	Method and apparatus for forming a paper web

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE102008040948A1 (de)	2008-08-01	2010-02-04	Voith Patent Gmbh	Doppelsiebformer für eine Maschine zur Herstellung einer Faserstoffbahn
WO2010012676A2 (fr) *	2008-08-01	2010-02-04	Voith Patent Gmbh	Dispositif de formage à double tamis pour une machine de production d'une bande de matière fibreuse
WO2010012676A3 (fr) *	2008-08-01	2010-05-06	Voith Patent Gmbh	Dispositif de formage à double tamis pour une machine de production d'une bande de matière fibreuse
DE102010003320A1 (de)	2010-03-26	2011-09-29	Voith Patent Gmbh	Blattbildungssystem für eine Maschine zur Herstellung einer Faserstoffbahn und dazugehöriges Verfahren
WO2011116999A1 (fr)	2010-03-26	2011-09-29	Voith Patent Gmbh	Système de formation de feuille pour une machine de fabrication d'une bande fibreuse et procédé associé

Also Published As

Publication number	Publication date
EP1586702B1 (fr)	2009-07-01
DE102004018329A1 (de)	2005-11-10
DE502005007600D1 (de)	2009-08-13
ATE435331T1 (de)	2009-07-15

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Publication	Publication Date	Title
DE3153305C2 (de)	1986-10-23	Entwässerungseinheit für Langsieb-Papiermaschinen
EP0933473A2 (fr)	1999-08-04	Formeur a deux toiles
EP2739780B1 (fr)	2017-01-04	Système de formation de feuille pour une machine de fabrication d'une bande de matière fibreuse à deux couches ou plus
DE3131957A1 (de)	1983-02-10	Entwaesserungseinheit fuer langsieb-papiermaschinen
DE69628490T2 (de)	2004-05-19	Doppelsiebformer für eine Papiermaschine mit Entwässerungsvorrichtung
EP1586702B1 (fr)	2009-07-01	Section de formage à deux toiles pour machine de fabrication d'une bande de matériau fibreux
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