EP1348803A2 - Mehrschicht-Stoffauflauf - Google Patents
Mehrschicht-Stoffauflauf Download PDFInfo
- Publication number
- EP1348803A2 EP1348803A2 EP03100381A EP03100381A EP1348803A2 EP 1348803 A2 EP1348803 A2 EP 1348803A2 EP 03100381 A EP03100381 A EP 03100381A EP 03100381 A EP03100381 A EP 03100381A EP 1348803 A2 EP1348803 A2 EP 1348803A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzle
- flow
- layer
- assigned
- layer headbox
- 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
Links
- 239000000725 suspension Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 description 4
Images
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
- D21F1/026—Details of the turbulence section
-
- 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
-
- 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
- D21F1/028—Details of the nozzle section
Definitions
- the invention relates to a multi-layer headbox for a paper machine, with several nozzle spaces, each assigned to one of the different layers are and in each of which a partial suspension flow assigned to the relevant layer up to an outlet gap provided at the end of the nozzle space is led.
- a multi-layer headbox is, for example, from EP 0 581 051 B1 known.
- Multi-layer headboxes have so far been used with approximately the same nozzle lengths Layer built. There are clear differences in length that result from the design less than 1% of the specified nozzle length.
- the aim of the invention is to provide an improved multi-layer headbox to create the kind mentioned.
- the maximum nozzle space length is preferably about 800 mm. It follows namely a significant improvement in jet stability with increasing nozzle length up to approx. 800 mm.
- the minimum nozzle space length is expediently less than or equal to 400 mm, in particular less than or equal to 350 mm and preferably approximately equal to 300 mm. Short nozzles generate higher turbulence than long nozzles. With short Nozzles can have a significantly lower tear length ratio and thus a higher one Cross strength can be achieved.
- a preferred expedient embodiment of the multilayer headbox according to the invention is characterized by the fact that it is for at least three Layers is designed and that the assigned to the two outer layers Nozzle spaces have a greater length than at least one of a medium size Layer assigned nozzle area.
- the two outer layers assigned nozzle spaces in particular have the same length.
- Such a headbox designed for at least three layers can advantageously can be used especially in connection with a gap former.
- the length difference between differently long nozzle spaces can advantageously viewed in the direction of flow between each shorter nozzle space and the relevant cross-flow distributor arranged Intermediate chamber can be bridged.
- the intermediate chamber can flow considered in particular between two turbulence generator sections be arranged.
- the headbox is a two-layer headbox executed, the assigned to the two layers Nozzle spaces a different length measured in the direction of flow have.
- the longer nozzle space of a ceiling layer is preferred and the shorter nozzle space is assigned to a back layer.
- the back will with a short nozzle and the ceiling with a long nozzle.
- the back is in this case with a low L / Q ratio and the ceiling with an optimal one Beam driven for good coverage and formation.
- the cross flow distributors assigned to the two different layers can according to the difference in length between the two long nozzle spaces in the direction of flow against each other.
- the length difference can also be caused, for example, by one in the direction of flow considered between the shorter nozzle space and the one in question
- Cross-flow distributor arranged intermediate chamber are bridged.
- a such an intermediate chamber can in particular be viewed again in the direction of flow be arranged between two turbulence generator sections.
- FIG. 1 shows a three-layer headbox 10 in a schematic sectional illustration with two longer nozzle spaces 12, 14 assigned to the two outer layers and a much shorter nozzle space 16 for the middle one Layer.
- the middle nozzle space 16 about 1/3 shorter than the two outer nozzle spaces 12, 14.
- the relevant partial suspension flows are in the nozzle spaces 12-16 in each case up to an outlet gap 18-22 provided at the end of the nozzle space guided.
- a turbulence generator 30-34 can be provided in each case for cross-flow distributors.
- the difference in length between the different lengths Nozzle spaces 12 - 16 bridged by an intermediate chamber 36, which is in the direction of flow S considered between that determined for the middle layer Cross flow distributor 28 and the associated nozzle space 16 is arranged.
- the maximum nozzle space length can be approximately 800 mm, for example.
- the Minimum nozzle space length is, for example, less than or equal to 400 mm, in particular less than or equal to 350 mm and preferably approximately equal to 300 mm.
- the intermediate chamber 36 is between two turbulence generator sections in the present case 34 ', 34 "arranged.
- Such a multi-layer headbox 10 can be used in particular in conjunction with a gap former can be used.
- Figure 2 shows a schematic sectional view of a comparable to that of Figure 1
- Three-layer headbox 10 with two of the two outer layers assigned longer nozzle spaces 12, 14 and one in comparison clearly shorter nozzle space 16 for the middle layer.
- This three-layer headbox 10 differs from that of FIG. 1 only in that here the intermediate chamber is missing and instead the different layers assigned cross-flow distributor 24-28 according to the length difference between the shorter middle nozzle chamber 16 on the one hand and the two longer ones
- nozzle spaces 12, 14 are offset from one another in the flow direction S. are.
- the middle cross-flow distributor is therefore opposite the two outer cross-flow distributors 24, 26 to the left, i.e. to the exit columns 18 - 22 offset. Is between the cross flow distributor 28 and the nozzle chamber 16 in the present case, therefore, only a single turbulence generator 34 is provided.
- this three-layer headbox 10 has at least essentially again the same structure as that of Figure 1. Corresponding parts are assigned the same reference numerals.
- e.g. also be a two-layer headbox.
- Figure 3 shows a schematic sectional view of such a two-layer headbox 38, in which the nozzle spaces 40, 42 have a different length measured in the flow direction S.
- the Back is with the shorter nozzle space 40 and the nozzle Cover produced with the nozzle having the longer nozzle space 42.
- the back in the present case is therefore with a relatively low L / Q ratio produced while the ceiling with an optimal beam for good Cover and formation is driven.
Landscapes
- Paper (AREA)
- Magnetic Heads (AREA)
- Production Of Multi-Layered Print Wiring Board (AREA)
Abstract
Description
- Figur 1
- eine schematische Schnittdarstellung eines Dreischicht-Stoffauflaufs mit zwei den beiden Außenschichten zugeordneten längeren Düsenräumen und einem im Vergleich dazu kürzeren Düsenraum für die mittlere Schicht, wobei die Längendifferenz zwischen den unterschiedlich langen Düsenräumen durch eine Zwischenkammer überbrückt ist,
- Figur 2
- eine schematische Schnittdarstellung eines vergleichbaren Dreischicht-Stoffauflaufs ohne Zwischenraum und
- Figur 3
- eine schematische Schnittdarstellung eines ZweischichtStoffauflaufs, dessen den beiden Schichten zugeordnete Düsenräume eine unterschiedliche Länge besitzen.
- 10
- Dreischicht-Stoffauflauf
- 12
- längerer Düsenraum
- 14
- längerer Düsenraum
- 16
- kürzerer Düsenraum
- 18
- Austrittsspalt
- 20
- Austrittsspalt
- 22
- Austrittsspalt
- 24
- Querstromverteiler
- 26
- Querstromverteiler
- 28
- Querstromverteiler
- 30
- Turbulenzerzeuger
- 32
- Turbulenzerzeuger
- 34
- Turbulenzerzeuger
- 34'
- Turbulenzerzeugerabschnitt
- 34"
- Turbulenzerzeugerabschnitt
- 36
- Zwischenkammer
- 38
- Zweischicht-Stoffauflauf
- 40
- kürzerer Düsenraum
- 42
- längerer Düsenraum
- 44
- Querstromverteiler
- 46
- Querstromverteiler
- 48
- Turbulenzerzeuger
- 50
- Turbulenzerzeuger
- S
- Strömungsrichtung
Claims (13)
- Mehrschicht-Stoffauflauf (10; 38) für eine Papiermaschine, mit mehreren Düsenräumen (12-16; 40, 42), die jeweils einer der verschiedenen Schichten zugeordneten sind und in denen jeweils ein der betreffenden Schicht zugeordneter Teilsuspensionsstrom bis zu einem am Düsenraumende vorgesehenen Austrittsspalt (18-22) geführt ist,
dadurch gekennzeichnet, dass die Düsenräume (12-16; 40, 42) zumindest teilweise eine unterschiedliche in Strömungsrichtung (S) gemessene Länge besitzen. - Mehrschicht-Stoffauflauf nach Anspruch 1,
dadurch gekennzeichnet, dass die maximale Düsenraumlänge etwa 800 mm beträgt. - Mehrschicht-Stoffauflauf nach Anspruch 1 oder 2,
dadurch gekennzeichnet, dass die minimale Düsenraumlänge kleiner oder gleich 400 mm, insbesondere kleiner oder gleich 350 mm und vorzugsweise etwa gleich 300 mm ist. - Mehrschicht-Stoffauflauf nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass er für zumindest drei Schichten auslegt ist und dass die den beiden Aussenschichten zugeordneten Düsenräume (12, 14) eine größere Länge besitzen als zumindest ein einer mittleren Schicht zugeordneter Düsenraum (16). - Mehrschicht-Stoffauflauf nach Anspruch 4,
dadurch gekennzeichnet, dass die den beiden Aussenschichten zugeordneten Düsenräume (12, 14) eine gleiche Länge besitzen. - Mehrschicht-Stoffauflauf nach Anspruch 4 oder 5,
dadurch gekennzeichnet, dass die Längendifferenz zwischen unterschiedlich langen Düsenräumen (12-16) durch eine in Strömungsrichtung betrachtet zwischen dem jeweils kürzeren Düsenraum (16) und dem betreffenden Querstromverteiler (28) angeordnete Zwischenkammer (36) überbrückt ist. - Mehrschicht-Stoffauflauf nach Anspruch 6,
dadurch gekennzeichnet, dass die Zwischenkammer (36) in Strömungsrichtung betrachtet zwischen zwei Turbulenzerzeugerabschnitten (34', 34") angeordnet ist. - Mehrschicht-Stoffauflauf nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass die den verschiedenen Schichten zugeordneten Querstromverteiler (24-28) entsprechend einer jeweiligen Längendifferenz zwischen unterschiedlich langen Düsenräumen (12-16) in Strömungsrichtung (S) gegeneinander versetzt sind. - Mehrschicht-Stoffauflauf nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass er als Zweischicht-Stoffauflauf (38) ausgeführt ist und die den beiden Schichten zugeordneten Düsenräume (40, 42) eine unterschiedliche in Strömungsrichtung (S) gemessene Länge besitzen. - Mehrschicht-Stoffauflauf nach Anspruch 9,
dadurch gekennzeichnet, dass der längere Düsenraum (40) einer Deckenschicht und der kürzere Düsenraum (42) einer Rückenschicht zugeordnet ist. - Mehrschicht-Stoffauflauf nach Anspruch 9 oder 10,
dadurch gekennzeichnet, dass die den beiden verschiedenen Schichten zugeordneten Querstromverteiler (44, 46) entsprechend der Längendifferenz zwischen den beiden unterschiedlich langen Düsenräumen (40, 42) in Strömungsrichtung (S) gegeneinander versetzt sind. - Mehrschicht-Stoffauflauf nach Anspruch 9 oder 10,
dadurch gekennzeichnet, dass die Längendifferenz zwischen den beiden unterschiedlich langen Düsenräumen (42, 40) durch eine in Strömungsrichtung (S) betrachtet zwischen dem kürzeren Düsenraum (40) und dem betreffenden Querstromverteiler (44) angeordnete Zwischenkammer überbrückt ist. - Mehrschicht-Stoffauflauf nach Anspruch 12,
dadurch gekennzeichnet, dass die Zwischenkammer in Strömungsrichtung betrachtet zwischen zwei Turbulenzerzeugerabschnitten angeordnet ist.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10213853 | 2002-03-27 | ||
| DE10213853A DE10213853A1 (de) | 2002-03-27 | 2002-03-27 | Mehrschicht-Stoffauflauf |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1348803A2 true EP1348803A2 (de) | 2003-10-01 |
| EP1348803A3 EP1348803A3 (de) | 2004-03-10 |
| EP1348803B1 EP1348803B1 (de) | 2010-05-05 |
Family
ID=27798219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03100381A Expired - Lifetime EP1348803B1 (de) | 2002-03-27 | 2003-02-19 | Mehrschicht-Stoffauflauf |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US6962646B2 (de) |
| EP (1) | EP1348803B1 (de) |
| AT (1) | ATE466994T1 (de) |
| DE (2) | DE10213853A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7588663B2 (en) * | 2006-10-20 | 2009-09-15 | Kimberly-Clark Worldwide, Inc. | Multiple mode headbox |
| US8871059B2 (en) * | 2012-02-16 | 2014-10-28 | International Paper Company | Methods and apparatus for forming fluff pulp sheets |
| US11441268B2 (en) | 2018-01-05 | 2022-09-13 | International Paper Company | Paper products having increased bending stiffness and cross-direction strength and methods for making the same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4376012A (en) | 1979-04-12 | 1983-03-08 | Beloit Corporation | Method of forming a multi-ply web from paper stock |
| GB2119824A (en) | 1982-03-30 | 1983-11-23 | Karlstad Mekaniska Ab | Headbox |
| EP0581051B1 (de) | 1992-07-31 | 1995-11-29 | Voith Sulzer Papiermaschinen GmbH | Mehrschichtstoffauflauf für eine Papiermaschine oder dergl. |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI58364C (fi) | 1977-07-13 | 1981-01-12 | Tampella Oy Ab | Matningsanordning foer en banformningsmaskin foer framstaellning av en tvao- eller flerskiktig fiberbana |
| SE422091B (sv) * | 1978-03-23 | 1982-02-15 | Karlstad Mekaniska Ab | Inloppslada for en pappersmaskin |
| SE421328B (sv) * | 1978-04-25 | 1981-12-14 | Karlstad Mekaniska Ab | Forfarande och anordning for bildande av en flerskiktsmeldstrale |
| US4376014A (en) * | 1979-04-12 | 1983-03-08 | Beloit Corporation | Headbox for forming multi-ply sheets |
| FI78750B (fi) * | 1982-07-20 | 1989-05-31 | Escher Wyss Gmbh | Flerskiktsinloppslaoda foer matande av pappersmassa till en vira. |
| DE3227218C2 (de) * | 1982-07-21 | 1984-10-18 | Escher Wyss Gmbh, 7980 Ravensburg | Mehrlagenstoffauflauf |
| DE19624052A1 (de) * | 1996-06-17 | 1996-12-12 | Voith Sulzer Papiermasch Gmbh | Dreischichtenstoffauflauf |
-
2002
- 2002-03-27 DE DE10213853A patent/DE10213853A1/de not_active Withdrawn
-
2003
- 2003-02-19 DE DE50312683T patent/DE50312683D1/de not_active Expired - Lifetime
- 2003-02-19 AT AT03100381T patent/ATE466994T1/de active
- 2003-02-19 EP EP03100381A patent/EP1348803B1/de not_active Expired - Lifetime
- 2003-03-26 US US10/396,839 patent/US6962646B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4376012A (en) | 1979-04-12 | 1983-03-08 | Beloit Corporation | Method of forming a multi-ply web from paper stock |
| GB2119824A (en) | 1982-03-30 | 1983-11-23 | Karlstad Mekaniska Ab | Headbox |
| EP0581051B1 (de) | 1992-07-31 | 1995-11-29 | Voith Sulzer Papiermaschinen GmbH | Mehrschichtstoffauflauf für eine Papiermaschine oder dergl. |
Also Published As
| Publication number | Publication date |
|---|---|
| US20030183352A1 (en) | 2003-10-02 |
| US6962646B2 (en) | 2005-11-08 |
| ATE466994T1 (de) | 2010-05-15 |
| DE10213853A1 (de) | 2003-10-16 |
| DE50312683D1 (de) | 2010-06-17 |
| EP1348803A3 (de) | 2004-03-10 |
| EP1348803B1 (de) | 2010-05-05 |
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