WO2002024422A1 - Method and arrangement for forming a fibre mat - Google Patents
Method and arrangement for forming a fibre mat Download PDFInfo
- Publication number
- WO2002024422A1 WO2002024422A1 PCT/SE2001/002021 SE0102021W WO0224422A1 WO 2002024422 A1 WO2002024422 A1 WO 2002024422A1 SE 0102021 W SE0102021 W SE 0102021W WO 0224422 A1 WO0224422 A1 WO 0224422A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- screw
- forming
- arrangement
- type
- rolls
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/10—Moulding of mats
- B27N3/14—Distributing or orienting the particles or fibres
Definitions
- the present invention relates to a method and an arrangement for continuously forming a fibre mat for the manufacture of fibreboard or the like, in which fibre material from a dosing arrangement is deposited on the surface of a moving conveyor belt or web in accordance with the preamble to patent claim 1 and patent claim 3, respectively.
- the invention also relates to a forming roll intended for use in such an arrangement, as defined in patent claim 13.
- the fibre mat is formed on a moving conveyor belt and subsequently compressed by means of hot pressing.
- the mat can be formed in a single homogeneous layer or in several layers having different properties for fibre, glue, moisture, etc.
- Such a fibre mat can also be formed on top of other types of mats such as OSB (Oriented Strand Board), wafer-board, particle board, etc., to produce a soft surface layer.
- OSB Oriented Strand Board
- the mat is usually formed in a passive manner, i.e. by just distributing the fibres on a moving belt or wire and then adjusting the thickness of the mat by removing fibres from the upper surface of the mat. It can be formed, for instance, by the fibres being transported in an air current from a fibre bin and deposited on a wire while air is simultaneously sucked through the wire, or by the fibres being deposited purely mechanically after being fed from a dosing bin onto a number of distributing rolls which spread the fibres down onto a forming belt in order to form a mat on the belt.
- pneumatic and mechanical systems comprising a combination of pneumatic and mechanical systems.
- a common problem is that, if its cross section is studied, it will be observed that a fibre mat produced in this way has pronounced irregularities. This may be due to differences in the type of raw material and to local process conditions, which may have such a great influence that the cross section of the formed mat may differ considerably from installation to installation as regards charac- ter and appearance.
- the fibre mat may, for instance, exhibit an excess of material at the outer edges while at the same time exhibiting a deficiency of material in the middle, or vice versa. In other cases it may exhibit an excess of material along one outer edge while the other outer edge exhibits a deficiency of material. In order to obtain a uniform mat, therefore, the problem of achieving redistribution of the fibre material in the mat must be solved.
- SE-C-511 259 and SE-C-508 504 show mechanical formers comprising a number of forming rolls operating at different levels above and to a certain extent in the fibre mat, to be already known for levelling the upper surface of the formed mat. According to SE-C-508 504 these forming rolls are provided with a number of inclined plates that penetrate down into the mat. According to SE-C-511 259 the forming rolls are instead provided with a number of variously shaped forming blades that penetrate down into the mat.
- both these known mechanical formers produce what is more like a whisking effect and no real distribution or transport of fibres in the transverse direction of the mat occurs. The problem of achieving a uniform mat thus remains.
- the object of the present invention is to solve the above-mentioned problems. This is achieved by a method having the characterizing features defined in claim 1 and by an arrangement as defined in claim 3, having the characterizing features defined therein. Since, in accordance with the present invention, at least one of the rotating forming rolls in the arrangement is of screw-type, the advantage is gained that, with the aid of this forming roll, material can be transported in the transverse direction of the mat from an area with excess material to an area deficient in material.
- the screw-type roll thus in principle acts as a feed worm and consider- ably more material can be transported/moved than is possible with known arrangements.
- the material in the mat is also distributed in a controlled manner so that a preferably uniform mat is obtained.
- the desired controlled distribution of the material in the fibre mat is obtained by controlling the rotation speed and/or direc- tion of rotation of said at least one screw-type forming roll and/or its vertical placing in relation to the fibre mat and/or lateral placing transverse to the direction of movement of the conveyor belt.
- Controlling the direction of rotation of the screw-type roll enables control of the direction in which the fibres are to be moved transversely across the fibre material.
- Adjusting the height of the screw-type roll in relation to the fibre mat enables control of the quantity of fibre to be moved.
- the quantity of fibre to be moved can also be controlled by adjusting the speed of rotation of the screw-type roll in relation to the linear speed, i.e. the speed of movement of the conveyor belt.
- the screw-type roll can be moved laterally, the possibility of moving material is also increased and, with more than one screw-type roll, the advantage is also gained of having variable forming width.
- forming width refers to the distance along the transverse direction or width of the conveyor belt where forming may take place.
- the arrangement comprises at least two screw-type forming rolls, each of which has an effective forming length that is less than the maximum forming width of the conveyor belt.
- effective forming length is meant the distance in longitudinal direction of the screw-type roll, transverse to the direction of movement of the mat, along which the screw- type roll can transport material and thus contribute to forming the mat.
- Each screw-type forming roll preferably has an effective forming length that is a proportion of the maximum forming width of the conveyor belt, which proportion is substantially directly proportional to the number of screw-type rolls. If an arrangement comprises two screw-type forming rolls then each of these has a forming length corresponding to approximately half the maximum forming width of the conveyor belt.
- the screw-type forming rolls together preferably also have a maximum effective forming length that corresponds substantially to the maximum forming width of the conveyor belt. In general it can be said that the number of screw-type rolls is chosen taking into consideration the width of the conveyor belt.
- the screw-type forming rolls are preferably displaced in relation to each other, in the direction of movement of the conveyor belt. They are preferably arranged so that they at least partly overlap each other.
- the arrangement comprises a screw-type forming roll comprising two roll sections with oppositely directed screw form.
- the forming roll(s) are advantageously included in a forming head and surrounded preferably by ordinary forming rolls seen in the direction of movement of the conveyor belt.
- a primary placing may be as rolls Nos. 4 and 5 seen from the entry to the forming head.
- the arrangement also comprises drive means for driving the screw-type forming roll or each of the screw-type forming rolls separately.
- the screw-type forming roll(s) can also be rotated individually and independently of each other in forward or backward direction. This offers the advantage, for instance, that two screw-type rolls can be driven in opposite directions so that material is transported from both outer areas of the mat, in towards the middle of the mat, or vice versa, by rotating the rolls in the opposite directions.
- the speed of rotation of the screw-type forming roll(s) is preferably variable.
- the rolls are preferably also movable in lateral direction, transverse to the direction of conveyance, as mentioned above. They can also advantageously be individually vertically movable so that the working depth in the mat can be controlled. This allows for none, or only one of the rolls to influence the forming, when desired, by raising the other screw-type roll(s) above the upper surface of the mat.
- FIG. 1 illustrates schematically, seen from above, a first embodiment of an arrangement comprising screw-type forming rolls in accordance with the present invention
- Fig. 2 illustrates schematically, seen from above
- Fig. 3 illustrates the arrangement in Fig. 1 , seen from the side.
- Fig. 1 shows a forming head used for continuously forming a fibre mat for the manufacture of fibreboard or the like.
- a moving conveyor belt with a surface for receipt and deposition of fibre material supplied from above, i.e. above the forming head, usually from a dosing bin provided with a feed-out device for the fibre material.
- the forming head comprises a number of forming rolls 1 , 3, 4, 6 for forming the surface of the fibre mat. These forming rolls are arranged in the transverse direction of the conveyor belt, and preferably have the same diameter. They are preferably arranged stepwise, as illustrated in Fig. 3.
- the forming roll situated lowest is at the inlet end of the forming head, marked with an arrow A.
- the conveyor belt passes in through the forming head and fibre material is supplied from above.
- the fibre mat becomes thicker as the material is added from above in the forming head, and the forming rolls gradually assume higher positions, which gives a stepwise arrangement seen from the side (see Fig. 3).
- the ends of the forming rolls are generally attached to a lifting beam 7 on each side of the forming head, and the height of this lifting beam in relation to the upper side of the mat is controlled by means of two jacks 9 arranged one at each end of the lifting beam.
- the forming rolls 3, 4 can preferably be raised or lowered individually. This is achieved with the aid of parallel jacks 8. Obviously, there is nothing to prevent the arrangement being designed so that all the forming rolls can be raised and lowered individually if so desired.
- the first embodiment illustrated in Fig. 1 comprises two screw-type forming rolls 3, 4, which may also be termed cross-section correcting rolls or screws, included in a forming head where they are surrounded by ordinary forming rolls.
- These ordinary forming rolls may be rolls of the wing-roll or wobble-roll type.
- the screw-type rolls can be likened to feed worms and thus consist of a rotatable shaft provided externally with flanges forming a screw thread.
- the two screw-type forming rolls 3 and 4, respectively are arranged one after the other in the direction of movement of the conveyor belt.
- the advantage of this arrangement is that the rolls can be arranged to slightly overlap each other.
- the arrangement comprises one screw-type forming roll 23 which may be described as consisting of two roll sections 24, 25 with a common shaft, the respective screw threads being oppositely directed, i.e. with left and right threading, respectively.
- This screw-type forming roll 23 is included in a forming head with other, previously known, forming rolls 1 , 6, in the same way as in the first embodiment. With such a forming roll, material in the mat can be moved from the edges of the mat towards its middle, or vice versa.
- the purpose of this embodiment is to illustrate that it is feasible to have only one screw-type forming roll. Alternatively the two sections of this screw-type forming roll could be separately suspended and driven. There is naturally nothing to prevent the two parts of the forming roll being threaded in the same direction. The movement of material then occurs from one edge of the mat to the other edge.
- the direction of rotation and speed of rotation of each roll can be chosen and controlled separately, independently both of the speed and direction of rotation of the other screw-type forming roll and of the speed and direction of rotation of the other forming rolls. Separate driving and control of each screw-type roll is therefore generally provided.
- each screw-type roll covers approximately 50% of the maximum forming width; i.e. the first screw-type roll 3 covers the first 50 per (0-50%) of the maximum forming width, and the second screw-type roll 4 covers the other 50 per cent (50-100%) of the maximum forming width.
- the forming width of the rolls can be varied by making the screw-type rolls 3, 4 in this embodiment displaceable in lateral direction seen in the direction of movement of the conveyor belt, as indicated by an arrow B, i.e. axially with respect to the rolls. It is thus possible to increase the area where the rolls overlap if desired. It is also possible easily to vary the embodiment in Fig. 1 so that the screw-type rolls can be displaced axially to produce a gap between the rolls where the formation of the mat is unaffected. It is thus possible to obtain variable forming width.
- one posi- tion potentiometer per screw-type roll is generally used to measure its vertical height in relation to the fibre mat produced, as well as jacks, as mentioned earlier.
- separate jacks may be used for raising the left and right ends of the roll and, in that case, two separate potentiometers per roll.
- This enables vertical adjustment of the roll with a variable angle for the left and right sides, i.e. the roll can be set with an axial inclination transverse to the direction of movement of the conveyor belt. In this way a systematic fault causing one edge of the fibre mat to be thicker than its other edge can be compensated. If no correction is required the screw-type roll(s) can be fully raised so that they do not work the mat.
- the direction of rotation of the screw-type rolls is chosen so that each roll moves material from the area where an excess of material exists, to an area where there is a deficiency of material.
- the speed of rotation of the screw-type rolls is chosen taking into consideration the linear speed and the quantity of material to be moved.
- the vertical position of the screw-type rolls is also adjusted in relation to the height of the mat, with regard to the amount of material to be moved. The equivalent is naturally applicable to the case using only one screw- type forming roll.
- a forming head with more than two screw-type forming rolls.
- the number of forming rolls depends to a great extent on the width of the conveyor belt.
- the variations possible as regards forming width, etc., can naturally also be increased by means of an arrangement having more than two screw-type forming rolls. In that case they may be displaced in relation to each other as shown in Fig. 1. It is also possible to combine the two embodiments.
- the forming rolls are arranged stepwise. However, there is nothing to prevent them from being arranged at the same level. It should be pointed out that in certain cases it may be possible for two screw-type forming rolls to have a common drive, for instance. However, this generally entails certain limitations in the possibility of redistributing the fibre material in the mat in different ways.
- the screw-type rolls may naturally also be used, if so desired, for pro- ducing a fibre mat that does not have a completely uniform profile, e.g. a wedge- shaped cross section.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Nonwoven Fabrics (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
- Treatment Of Fiber Materials (AREA)
- Preliminary Treatment Of Fibers (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE60118768T DE60118768T2 (en) | 2000-09-21 | 2001-09-20 | METHOD AND ARRANGEMENT FOR PRODUCING A FIBER MAT |
EP01970424A EP1330344B1 (en) | 2000-09-21 | 2001-09-20 | Method and arrangement for forming a fibre mat |
AU2001290425A AU2001290425A1 (en) | 2000-09-21 | 2001-09-20 | Method and arrangement for forming a fibre mat |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0003372-0 | 2000-09-21 | ||
SE0003372A SE517232C2 (en) | 2000-09-21 | 2000-09-21 | Method and apparatus for continuous molding of a fiber mat and forming mold for the apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002024422A1 true WO2002024422A1 (en) | 2002-03-28 |
Family
ID=20281103
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE2001/002021 WO2002024422A1 (en) | 2000-09-21 | 2001-09-20 | Method and arrangement for forming a fibre mat |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1330344B1 (en) |
AU (1) | AU2001290425A1 (en) |
DE (1) | DE60118768T2 (en) |
SE (1) | SE517232C2 (en) |
WO (1) | WO2002024422A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10206594A1 (en) * | 2002-02-15 | 2003-08-28 | Dieffenbacher Gmbh Maschf | Roller to scatter glued wood chips, for chipboard production, has a grooved surface structure at every second roller with an angled groove configuration for a homogenous spread over a large width |
WO2004103660A1 (en) * | 2003-05-22 | 2004-12-02 | Metso Paper Sundsvall Ab | Method and device for continous forming of mats of different widths of material |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE526641C2 (en) | 2004-02-27 | 2005-10-18 | Metso Panelboard Ab | Method and apparatus for forming a mat of fibrous material |
DE102017111018B4 (en) * | 2017-05-19 | 2019-02-14 | Siempelkamp Maschinen- Und Anlagenbau Gmbh | dispersion unit |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998036884A1 (en) * | 1997-02-24 | 1998-08-27 | Sunds Defibrator Industries Aktiebolag | Device for spreading and distributing particles on a material web |
SE511259C2 (en) * | 1998-01-26 | 1999-09-06 | Sunds Defibrator Ind Ab | Dry forming process for a web used to make fibreboard material |
-
2000
- 2000-09-21 SE SE0003372A patent/SE517232C2/en not_active IP Right Cessation
-
2001
- 2001-09-20 DE DE60118768T patent/DE60118768T2/en not_active Expired - Fee Related
- 2001-09-20 WO PCT/SE2001/002021 patent/WO2002024422A1/en active IP Right Grant
- 2001-09-20 AU AU2001290425A patent/AU2001290425A1/en not_active Abandoned
- 2001-09-20 EP EP01970424A patent/EP1330344B1/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998036884A1 (en) * | 1997-02-24 | 1998-08-27 | Sunds Defibrator Industries Aktiebolag | Device for spreading and distributing particles on a material web |
SE511259C2 (en) * | 1998-01-26 | 1999-09-06 | Sunds Defibrator Ind Ab | Dry forming process for a web used to make fibreboard material |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10206594A1 (en) * | 2002-02-15 | 2003-08-28 | Dieffenbacher Gmbh Maschf | Roller to scatter glued wood chips, for chipboard production, has a grooved surface structure at every second roller with an angled groove configuration for a homogenous spread over a large width |
WO2004103660A1 (en) * | 2003-05-22 | 2004-12-02 | Metso Paper Sundsvall Ab | Method and device for continous forming of mats of different widths of material |
Also Published As
Publication number | Publication date |
---|---|
SE517232C2 (en) | 2002-05-14 |
EP1330344A1 (en) | 2003-07-30 |
DE60118768T2 (en) | 2007-04-12 |
SE0003372L (en) | 2002-03-22 |
EP1330344B1 (en) | 2006-04-12 |
AU2001290425A1 (en) | 2002-04-02 |
SE0003372D0 (en) | 2000-09-21 |
DE60118768D1 (en) | 2006-05-24 |
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