EP1218591B1 - Method and device for forming a muliply web - Google Patents
Method and device for forming a muliply web Download PDFInfo
- Publication number
- EP1218591B1 EP1218591B1 EP00944530A EP00944530A EP1218591B1 EP 1218591 B1 EP1218591 B1 EP 1218591B1 EP 00944530 A EP00944530 A EP 00944530A EP 00944530 A EP00944530 A EP 00944530A EP 1218591 B1 EP1218591 B1 EP 1218591B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- forming
- roll
- rolls
- wire
- ply
- 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.)
- Expired - Lifetime
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
- D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
- D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers
-
- 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
- D21F9/006—Complete machines for making continuous webs of paper of the twin-wire type paper or board consisting of two or more layers
Definitions
- This invention concerns a method for high speed forming of a multi-ply paper or board according to the preamble of claim 1, and a forming apparatus according to the preamble of claim 6.
- Multi-ply forming enables the cost performance relationship of the product to be optimized by using different furnishes in different plies.
- multi-ply technology makes it possible to increase the content of recycled paper and high yield pulps which are interesting both for cost reducing reasons and for environmental reasons.
- Existing technology fails however to accomplish the task of high speed forming of multi-ply paper or board with superior mechanical properties as well as favourable ply coverage characteristics.
- Multi-ply forming technology may be grouped into three main categories:
- Separate forming is commonly carried out with a multi-fourdrinier machine. Hybrid forming or twin-wire forming (cf. e.g. DE 44 02 273 C2) may also be applied.
- the increase in dewatering capacity given by two or more separate forming units may be utilized for increased production rates and/or lowered forming consistency for improved sheet properties. All variants of separate forming have one problem in common, however, viz. the ply bonding which generally limits the Z-direction strength of the multi-ply product. Often starch or some other bonding agent have to be sprayed on the plies before couching them together.
- twin-wire forming would be preferable for speeds above 1000 m/min, avoiding free surface instabilities and providing higher dewatering capacity, the problem of ply-bonding then becomes worse. This is because a twin-wire-formed sheet ply has two wire sides with poor ply-bonding ability, in contrast to a fourdrinier ply which has one wire side and one top side with a better ply-bonding ability.
- Simultaneous forming of a multi-ply product with a multi-layer head box may also be employed.
- multi-layer head boxes are found in EP 0 681 057 A2 and in GB 2 019 465. With this method, however, the dewatering capacity is limited to that given by a single dewatering unit. Hence, this principle is not suitable for high speed forming of moderate to high grammages at low forming consistency. Hitherto, it has moreover proved difficult to accomplish acceptable ply coverage characteristics with simultaneous forming.
- Multi-ply forming in a sequential mode has traditionally been applied in the forming of two-ply liner board using a secondary head box placed some distance downstream a fourdrinier wire with dewatering of the top ply through the primary web ply formed upstream of the secondary head box.
- the problem of ply-bonding is essentially avoided by depositing a fibre suspension onto the pre-formed web. This means that the Z-direction strength of the multi-ply product is often determined by the Z-direction strength of the individual plies rather than by the ply-bonding.
- Forming a top ply onto a primary web ply on a fourdrinier wire involves several disadvantages, however. It suffices to mention the drawback regarding dewatering capacity and the severe grammage variations due to the free surface occurring especially above 1000 m/min.
- Dewatering of the top ply through a web-free wire is moreover advantageous with regard to purity and forming of the top ply, because a separate handling of the white-water of the top ply is possible and because any influence of the primary web ply structure on the top ply is substantially avoided.
- the capacity of this kind of units is still limited, however, and they are typically used on multi-ply board machines running slower than 600 m/min.
- Roll forming according to Webster's method was introduced in its basic sense some four decades ago (US 3,056,719), and is well-known in the field of high speed production of single-ply paper.
- the forming occurs between two wires running over a rotating forming roll, by introducing the fibre suspension jet into the twin-wire nip at such a velocity that the outer one of the tensioned wires is deflected while maintaining a substantially constant tension during the deflection of the outer wire by fact that the outer wire is supported by a rotating support, at least one of which one is resiliently or displaceably mounted to compensate for the deflection.
- the dewatering pressure is determined by the tension of the outer wire divided with the instantaneous radius of curvature, and during the roll dewatering the pressure rises steeply during an initial phase, after which it levels out to a plateau.
- WO 99/09249 a method and an apparatus for multi-ply forming are shown, where roll forming according to Webster's method is used for forming a top-ply on top of a primary base ply. Roll forming according to Webster is preferably applied to form all plies including the primary web ply. Two forming and dewatering rolls are shown for each forming unit.
- a long base wire runs through all the dewatering units, which may imply problems concerning the wire stability as several dewatering units are used.
- each wire runs over two forming units at the most.
- a problem with the latter configuration concerns the separation of one of the wires from the paper web and the second wire after the second roll in the forming units, where the second dewatering roll lies over the first roll. The separation herein occurs by means of the outer wire over the second roll leaves this, while the web and the inner wire continues substantially horizontally to next forming unit.
- the separation of one of the wires from the paper web and the second wire there is in the actual dry soilds area a risk that pieces come loose from the paper web. With the actual configuration pieces of the paper web may be thrown out of the nips and due to gravity fall down on the paper web, which may lead to damages on the finished product and to paper web breakage.
- the object of the present invention is to achieve a method for forming a multi-ply paper or board product at high speed, having a low investment cost with maintained high dewatering capacity and avoiding runnability problems related to pieces coming loose from the paper web at the separationpoint of one wire from the paper web and the second wire.
- the wire winding angle should preferably be at least 120° for enabling a high dewatering capacity.
- the wire with the incoming paper is lead to the respectively forming roll, at an angle of at least 10°, preferably at least 15°, relative to the horizontal plane. In this way space for the head boxes is given while avoiding long free jet lengths.
- the invention refers to an apparatus according to claim 6 for forming a multi-ply paper or board product applying the method defined above.
- a fibre furnish which is fed out from the head box 1 is introduced into a nip created between two tensioned wires, an inner wire 2 and an outer wire 3, both of which wrap around a rotating forming roll 4.
- the fibre suspension jet is introduced into the twin-wire nip at such a high speed that the outer wire 3 of the tensioned wires is deflected such as is described in US-A-3,056,719.
- the tension of the outer wire 3 is maintained substantially constant during the deflection, by the fact that it is supported by a rotating support 5, being resiliently or displaceably mounted to compensate for said deflection.
- the principal dewatering occurs in each forming unit over only one forming roll 4, i.e.
- the wires runs with the fibre suspension/the paper web between over only one roll- the forming roll 4.
- the roll winding angle ⁇ of the outer wire 3 should be at least 110° and preferably at least 120°.
- the diameter of the roll should be at least 1,2 m, preferably approx. 2 m.
- the forming phase is completed during the roll dewatering. Thereafter the fibre network structure is essentially fixed so that any significant rearrangement of the fibres does not occur as the paper web passes over further dewatering elements. Further consolidation of the paper web may then be accomplished according to well-known methods such as couch rolls, suction boxes and the like, before the paper web enters the press section or another forming unit.
- the wires 2,3 leave the roll 4 in an upper quadrant (see fig. 2), in the example shown, the upper upward quadrant E, where the paper web follows the outer wire 2.
- the separation of the outer wire 2 with accompanying paper web from the inner wire 3 occurs by means of a suction box 6, or in another way, accomplishing that the paper web follows the outer wire after the forming roll 4.
- the paper web here follows the outer wire 2 upwards and is later turned over a turn roll 7.
- the second forming comprises a head box 9, a twin-wire nip formed by the wire 2, which now may constitute the inner wire, and an outer wire 10 and also a forming roll 11.
- the forming rolls are placed alternatingly in two planes. Thereby the difference in height between the extreme points of the forming rolls are limited to preferably maximum 4-5 m.
- a second web-ply is formed on the moist primary web-ply, which preferably has a dryness of 7-15 % by weight.
- the head box 9 delivers a fibre suspension jet in to the twin-wire nip created by the wires 2 and 10. In this case the jet impingement also occurs at such a speed that the outer wire 10 is deflected.
- the tension of the outer wire 10 is maintained substantially constant during the deflection, by the fact that it is supported by a rotating support 12, being resiliently or displaceably mounted to compensate for said deflection.
- the forming occurs in an equivalent way as in the first forming unit.
- the wires 2, 3 leave the roll 4 in a lower downward quadrant H (see fig.2), where the paper web follows the outer wire 10 downwards.
- the separation of the outer wire 10 with accompanying paper web of the inner wire 2 occurs by means of a suction box 13, or in another way accomplishing, that the paper web follows the outer wire after the forming roll 11.
- the paper web here follows the outer wire 10 downwards to later be lead over a turn roll 14.
- a third web-ply is formed on top of the both other formed plies.
- the third forming unit is located on the same plane- the lower plane- as the first forming unit.
- the head box 16 delivers a fibre suspension jet in the twin-wire nip being created by the wires 10 and 17. In this case the jet impingement also occurs at such a speed that the outer wire 17, being supported of a resiliently or displaceably support 19, is deflected.
- the wires 10,17 leave the roll 18 in an upper quadrant E (se fig. 2), where the paper web follows the outer wire 17.
- the separation of the outer wire 17 with accompanying paper web from the inner wire 10 occurs by means of a suction box 20, or in another way accomplishing, that the web follows the outer wire 17 after the forming roll 18.
- the paper web follows the outer wire 17 upwards to later be lead over a turn roll 21. Possible pieces of the paper web which have come loose at the separation follow the inner wire 17, from which they are removed by a wire sprout or the like.
- the invention is of course not limited to the embodiment shown and described, but several modifications thereof are possible within the scope of the claims.
- the invention also comprises that one or several of the head boxes may be a multi-layer head box.
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- Paper (AREA)
- Lasers (AREA)
- Die Bonding (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Ropes Or Cables (AREA)
- Seal Device For Vehicle (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
Abstract
Description
The invention also comprises that one or several of the head boxes may be a multi-layer head box.
Claims (10)
- Method for forming a multi-ply paper or board product, in which all the plies are formed on top of each other in a sequential mode, each ply being formed by a roll forming technique of the type where a fibre suspension jet is fed into a nip created between two tensioned wires (2, 3; 2, 10; 10, 17) which wrap around a rotating forming roll (4; 11; 18), the fibre suspension jet being fed into said nip at such a speed that the outer one (2; 10; 17) of the two wires is deflected while maintaining a substantially constant tension during the deflection of the outer wire by supporting the outer wire on rotating supports (5, 7; 12, 14;19; 21), at least one (5; 14; 19) of which is resiliently or displaceably mounted to compensate for said deflection
characterised in thatthe forming of each ply occurs over only one forming roll (4; 11; 18),the wire winding angle (α) over the forming rolls is at least 110°,the axes of rotation of the forming rolls are located alternatingly in a lower plane and in an upper plane, andfor the forming roll or rolls (11) having the axis of rotation in the upper plane the wires (2,10) leave the roll in a lower quadrant (G, H) thereof, where the paper web follows the outer wire (10), and for the forming roll or rolls (4; 18) having the axis of rotation in the lower plane the wires (2, 3; 10, 17) leave the roll in an upper quadrant (E, F) thereof, where the paper web also in this case follows the outer wire (2; 17). - Method as claimed in claim 1,
characterised in that the wire winding angle (α) over the forming rolls (4; 11; 18) is at least 120°. - Method as claimed in claim 1 or 2,
characterised in that at the forming rolls (11;18) used for forming the second ply and the following plies the wire (2; 10) with the incoming paper web is lead to the respective forming roll (11; 18) at an angle (β) of at least 10°, preferably of at least 15°, relative to the horizontal plane. - Method as claimed in any of the previous claims,
characterised in that for the forming roll or rolls (4; 18) having the axis of rotation in the lower plane the wires (2, 3; 10, 17) leave the roll in an upper upward quadrant (E) thereof. - Method as claimed in any of the previous claims,
characterised in that for the forming roll or rolls (11) having the axis of rotation in the upper plane the wires (2, 10) leave the roll in a lower downward quadrant (H) thereof. - Apparatus for forming a multi-ply paper or board product carrying out the method according to claim 1, in which apparatus the plies are formed on top of each other in a sequential mode, and which apparatus as the only forming unit for forming each ply comprises a roll forming unit of the type where a fibre suspension jet is fed into a nip created between two tensioned wires (2, 3; 2, 10;10, 17) which wrap around a rotating forming roll (4; 11; 18), the fibre suspension jet being fed into said nip at such a speed that the outer one (2; 10; 17) of the two wires is deflected and where the outer wire (2; 10; 17) is supported on rotating supports (5, 7; 12, 14; 19,21), at least one (5; 14; 19) of which is resiliently or displaceably mounted to compensate for said deflection and maintain a substantially constant tension during the deflection of the outer wire,
characterised in thatthe apparatus comprises only one forming roll (4; 11; 18) for forming each ply,the wire winding angle (α) over the forming rolls is at least 110°,the axes of rotation of the forming rolls are placed alternatingly in a lower plane and in an upper plane, andfor the forming roll or rolls (11) having the axis of rotation in the upper plane the wires (2, 10) are arranged to leave the roll in a lower quadrant (G, H) thereof, where the paper web follows the outer wire (10), and for the forming roll or rolls (4; 18) having the axis of rotation in the lower plane the wires (2, 3; 10, 17) are arranged to leave the roll in an upper quadrant (E, F) thereof, where also in this case the paper web follows the outer wire (2; 17). - Apparatus for forming a multi-ply web as claimed in claim 6,
characterised in that the wire winding angle (α) over the forming rolls (4;11;18) is at least 120°. - Apparatus as claimed in claim 6 or 7,
characterised in that at the forming rolls (11; 18) used for forming the second ply and the following plies the wire (2; 10) with the incoming paper web is lead to the respective forming roll (11; 18) at an angle (β) of at least 10°, preferably at least 15°, relative to the horizontal plane. - Apparatus as claimed in any of claims 6 to 8,
characterised in that for the forming roll or rolls (4; 18) having the axis of rotation in the lower plane the wires (2, 3; 10, 17) are arranged to leave the roll in an upper upward quadrant (E) thereof. - Apparatus as claimed in any of claims 6 to 9,
characterised in that for the forming roll or rolls (11) having the axis of rotation in the upper plane the wires are arranged to leave the roll in a lower downward quadrant (H) thereof.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9902246A SE514412C2 (en) | 1999-06-15 | 1999-06-15 | Method and apparatus for forming a fibrous web |
SE9902246 | 1999-06-15 | ||
PCT/SE2000/001258 WO2000077299A1 (en) | 1999-06-15 | 2000-06-15 | Method and device for forming a muliply web |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1218591A1 EP1218591A1 (en) | 2002-07-03 |
EP1218591B1 true EP1218591B1 (en) | 2004-10-20 |
Family
ID=20416075
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00944530A Expired - Lifetime EP1218591B1 (en) | 1999-06-15 | 2000-06-15 | Method and device for forming a muliply web |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP1218591B1 (en) |
AT (1) | ATE280270T1 (en) |
AU (1) | AU5861500A (en) |
DE (1) | DE60015168T2 (en) |
ES (1) | ES2231216T3 (en) |
PT (1) | PT1218591E (en) |
SE (1) | SE514412C2 (en) |
WO (1) | WO2000077299A1 (en) |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3056719A (en) * | 1959-07-09 | 1962-10-02 | David R Webster | Continuous web forming machine |
SE510341C2 (en) * | 1997-08-19 | 1999-05-17 | Sca Research Ab | Method and apparatus for forming a multilayer web |
-
1999
- 1999-06-15 SE SE9902246A patent/SE514412C2/en not_active IP Right Cessation
-
2000
- 2000-06-15 DE DE60015168T patent/DE60015168T2/en not_active Expired - Fee Related
- 2000-06-15 EP EP00944530A patent/EP1218591B1/en not_active Expired - Lifetime
- 2000-06-15 WO PCT/SE2000/001258 patent/WO2000077299A1/en active IP Right Grant
- 2000-06-15 AU AU58615/00A patent/AU5861500A/en not_active Abandoned
- 2000-06-15 AT AT00944530T patent/ATE280270T1/en not_active IP Right Cessation
- 2000-06-15 ES ES00944530T patent/ES2231216T3/en not_active Expired - Lifetime
- 2000-06-15 PT PT00944530T patent/PT1218591E/en unknown
Also Published As
Publication number | Publication date |
---|---|
ES2231216T3 (en) | 2005-05-16 |
DE60015168T2 (en) | 2005-11-03 |
EP1218591A1 (en) | 2002-07-03 |
PT1218591E (en) | 2005-02-28 |
SE9902246D0 (en) | 1999-06-15 |
AU5861500A (en) | 2001-01-02 |
DE60015168D1 (en) | 2004-11-25 |
ATE280270T1 (en) | 2004-11-15 |
SE9902246L (en) | 2000-12-16 |
SE514412C2 (en) | 2001-02-19 |
WO2000077299A1 (en) | 2000-12-21 |
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