US20020050328A1 - Method and device in the production of a web material - Google Patents
Method and device in the production of a web material Download PDFInfo
- Publication number
- US20020050328A1 US20020050328A1 US10/021,022 US2102201A US2002050328A1 US 20020050328 A1 US20020050328 A1 US 20020050328A1 US 2102201 A US2102201 A US 2102201A US 2002050328 A1 US2002050328 A1 US 2002050328A1
- Authority
- US
- United States
- Prior art keywords
- stock
- wire
- ultrasound
- section
- furnished
- 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.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000000463 material Substances 0.000 title claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 238000002604 ultrasonography Methods 0.000 claims abstract description 56
- 244000144992 flock Species 0.000 claims abstract description 21
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 18
- 239000000835 fiber Substances 0.000 claims description 14
- 230000005540 biological transmission Effects 0.000 claims 1
- 239000011888 foil Substances 0.000 claims 1
- 239000007788 liquid Substances 0.000 claims 1
- 239000007791 liquid phase Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 description 4
- 239000000945 filler Substances 0.000 description 4
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000011121 hardwood Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011122 softwood Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
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
- D21F1/18—Shaking apparatus for wire-cloths and associated parts
-
- 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 method to improve, in the production of a web which to an essential part consists of cellulosic fibers, the formation of the web material in a one or plural wire machine by, to an essential part, dispersing existing flocks in the stock which is led from an inlet box out onto at least one wire, and to counteract the reformation of flocks in the stock on the wire.
- the invention also relates to a device for performing the method. The description also includes a short account of a method to clean press felts and wires.
- the raw material is mainly cellulosic fibers and in most cases also fillers, such as calcium carbonate and/or clay, retention agents and so on are included.
- the included components tend, in connection with the production of paper and board, to form flocks in the stock with poor distribution of the components as a result.
- the formation is used as a measurement of how even the components, mainly the fibers and fillers, which are included in the paper or board, are distributed.
- the formation is a very important property of paper and board.
- a paper or board with poor formation gives a stained impression, has poorer printing properties and poorer strength than a paper or a board with good formation.
- By improving the formation essential improvements in quality can be achieved.
- the basis weight of the paper or board can be decreased with sustained strength, which results in a not unessential economic potential.
- top wire structures can also be said to be a part of this goal, although the installation of top wires in the first place is dictated by other purposes.
- the object of the invention is to attack the above problems. This is, in connection with the method described in the introduction, achieved by ultrasound energy being furnished to the stock in at least one wire section, suitably by the ultrasound energy being furnished to the stock on the wire in at least one cross directional section of the wire section along the transport direction of the stock on the wire.
- the ultrasound energy is preferably furnished as ultrasound waves with frequencies between 15 and 75 kHz, which has surprisingly shown to result in considerably better formation when ultrasound elements (ultrasound generators or elements which can transmit ultrasound energy from one or more generators). which emit energy by means of oscillation with said frequency, are placed within the wire section of a paper or board machine in such a way that ultrasound energy is transmitted to the stock on the wire.
- the ultrasound energy transmitting elements should be positioned directly below the wire or wires which follow after the inlet box or boxes of the paper or board machine. As a consequence of this positioning, the effect can also be achieved that the wire or wires are cleaned.
- the elements are moreover positioned so that an optimal effect, i.e. optimal ultrasound energy per mass unit of the stock (suspension of fibers/fillers) is achieved, at the same time as it is important that the concentration of the stock (the dry content) in at least one or some of said sections of the wire section still is adequately low so that flocks which are formed are not bound too strong, but can be broken apart. Consequently, at least some ultrasound elements are positioned e.g.
- the stock on the wire has a concentration of between 0,2 and 6%, suitably between 0,5 and 5% or between 1 and 6%.
- a conceivable optimal range of content can also be between 1,5 and 5%.
- a positioning of the ultrasound elements further back on the paper machine, e.g. in or on the inlet box, will for certain result in that flocks which may have been formed possibly can be dispersed there, but these can afterwards be reformed on the wire or wires. Consequently, a positioning of the elements before the wire section will result in none or very small improvement of the formation.
- the concentration of the stock is more than 5 or 6%, preferably in order to prevent flocks from being reformed. It can for example be conceived to place ultrasound elements within sections of the area which is common for a top wire section and a sub wire section, within which sections the concentration of the stock may be considerably higher than 5 a 6% or up to 15%, preferably a maximum of 12%, as well as within the introductory section of the sub wire, where the concentration of the stock may be lower than 5 a 6%.
- the ultrasound elements within the introductory section of the sub wire, where the concentration of the stock is 0,2-6%, preferably 0,5-5% or 1-6%, e.g.
- the ultrasound energy is suitably furnished to the stock on the wire within a plurality of cross directional sections which are arranged after each other, e.g. within three to five after each other following, cross directional sections.
- This will also result in a possibility to adapt the frequency and/or power of the ultrasound to the concentration of the stock within different sections of the wire section, so that e.g. ultrasound energy with a higher frequency is furnished in at least one section which is closer to the inlet box, than within a subsequent section further away from the inlet box.
- the ultrasound elements are suitably arranged so that the ultrasound power (amplitude) and/or the frequency can be controlled.
- an optimisation of the formation will be possible, so that it can be adapted to the composition of the stock. Consequently, flocks which contain larger amounts of fines and fillers should demand a higher frequency than e.g. a stock which is based on a hard wood pulp with short fibers, which may demand a somewhat lower frequency.
- the lowest frequency should be demanded in connection with the dispersion of fibers from soft wood pulp with long fibers.
- the wire speed has effect on suitable frequency and/or power.
- the optimisation of the frequency and power of the ultrasound elements can of course be made by means of a parent control and regulation equipment.
- the ultrasound elements may consequently operate sequentially by changing the frequency and/or power or also the elements may be dedicated for certain prechosen frequencies and/or powers which attack certain flock sizes or a certain content of flock.
- One aspect of the invention is characterised in that the ultrasound elements are equipped to operate in this way. Further features and aspects of the invention are apparent from the subsequent claims.
- a water spray can be positioned either on the same side as the ultrasound element or on the opposite side in order to supply the water volume which is necessary to transmit the ultrasound from the element to the inner structure of the felt or wire.
Abstract
Method for improving the formation of a web material in a wire machine, including dispersing existing flocks in stock which is transported along a transport direction from an inlet box onto a plurality of wire sections which are arranged after each other along the direction of travel, counteracting the reformation of flocks in the stock on the wire by furnishing ultrasound energy as ultrasound waves with frequencies between 15 and 75 kHz to the stock on the wire sections. The ultrasound has a higher frequency within at least one section which is closer to the inlet box than a subsequent section further away from the inlet box, within which subsequent section the ultrasound has as lower frequency.
Description
- The invention relates to a method to improve, in the production of a web which to an essential part consists of cellulosic fibers, the formation of the web material in a one or plural wire machine by, to an essential part, dispersing existing flocks in the stock which is led from an inlet box out onto at least one wire, and to counteract the reformation of flocks in the stock on the wire. The invention also relates to a device for performing the method. The description also includes a short account of a method to clean press felts and wires.
- When producing paper and board, the raw material is mainly cellulosic fibers and in most cases also fillers, such as calcium carbonate and/or clay, retention agents and so on are included. The included components tend, in connection with the production of paper and board, to form flocks in the stock with poor distribution of the components as a result. The formation is used as a measurement of how even the components, mainly the fibers and fillers, which are included in the paper or board, are distributed.
- The formation is a very important property of paper and board. A paper or board with poor formation gives a stained impression, has poorer printing properties and poorer strength than a paper or a board with good formation. By improving the formation, essential improvements in quality can be achieved. As an alternative, the basis weight of the paper or board can be decreased with sustained strength, which results in a not unessential economic potential.
- Traditionally, it has been tried to solve the problem with fiber flocks by developing the design of the inlet boxes or equipment in near connection with the inlet box. It has however proved impossible to definitely solve the problem with formation, since fiber flocks quickly reform after the stock has left the inlet box and has entered onto the wire.
- It has also been suggested different arrangements within the wire section, which to a certain extent can prevent the reformation of fiber flocks, for example different types of vibration and/or shaking means. The installation of top wire structures can also be said to be a part of this goal, although the installation of top wires in the first place is dictated by other purposes.
- As a conclusion it can be said that the equipment, which so far has been used or proposed in order to take care of the problem of fiber flocks, is difficult to control, complicated, capital demanding and that it obstructs or prevents the optimisation of other quality properties than formation in the paper or board. A consequence of this compromising is e.g. that the orientation of fibers in the paper or board is difficult to optimise. A result of the use of so far known equipment for improving the formation, is typically such conditions that more fibers are oriented in the length direction of the web material than in its cross direction. This results in poorer strength properties in the cross direction of the product.
- The object of the invention is to attack the above problems. This is, in connection with the method described in the introduction, achieved by ultrasound energy being furnished to the stock in at least one wire section, suitably by the ultrasound energy being furnished to the stock on the wire in at least one cross directional section of the wire section along the transport direction of the stock on the wire. The ultrasound energy is preferably furnished as ultrasound waves with frequencies between 15 and 75 kHz, which has surprisingly shown to result in considerably better formation when ultrasound elements (ultrasound generators or elements which can transmit ultrasound energy from one or more generators). which emit energy by means of oscillation with said frequency, are placed within the wire section of a paper or board machine in such a way that ultrasound energy is transmitted to the stock on the wire. In order to achieve the best effect, the ultrasound energy transmitting elements should be positioned directly below the wire or wires which follow after the inlet box or boxes of the paper or board machine. As a consequence of this positioning, the effect can also be achieved that the wire or wires are cleaned. The elements are moreover positioned so that an optimal effect, i.e. optimal ultrasound energy per mass unit of the stock (suspension of fibers/fillers) is achieved, at the same time as it is important that the concentration of the stock (the dry content) in at least one or some of said sections of the wire section still is adequately low so that flocks which are formed are not bound too strong, but can be broken apart. Consequently, at least some ultrasound elements are positioned e.g. so that they mainly influence the stock within at least one section of the wire section where the stock on the wire has a concentration of between 0,2 and 6%, suitably between 0,5 and 5% or between 1 and 6%. A conceivable optimal range of content can also be between 1,5 and 5%. A positioning of the ultrasound elements further back on the paper machine, e.g. in or on the inlet box, will for certain result in that flocks which may have been formed possibly can be dispersed there, but these can afterwards be reformed on the wire or wires. Consequently, a positioning of the elements before the wire section will result in none or very small improvement of the formation.
- In certain cases, it can be conceived to position elements which transmit ultrasound energy also within one or more sections where the concentration of the stock is more than 5 or 6%, preferably in order to prevent flocks from being reformed. It can for example be conceived to place ultrasound elements within sections of the area which is common for a top wire section and a sub wire section, within which sections the concentration of the stock may be considerably higher than 5 a 6% or up to 15%, preferably a maximum of 12%, as well as within the introductory section of the sub wire, where the concentration of the stock may be lower than 5 a 6%. The ultrasound elements within the introductory section of the sub wire, where the concentration of the stock is 0,2-6%, preferably 0,5-5% or 1-6%, e.g. 1,5-5%, hereby act to both dissolve flocks which have already been formed and to prevent new establishment of flocks, while ultrasound elements within the area where the concentration is as much as between S and 15%, preferably between 6 and 12%, in the first place are acting to preserve the good formation.
- The ultrasound energy is suitably furnished to the stock on the wire within a plurality of cross directional sections which are arranged after each other, e.g. within three to five after each other following, cross directional sections. This will also result in a possibility to adapt the frequency and/or power of the ultrasound to the concentration of the stock within different sections of the wire section, so that e.g. ultrasound energy with a higher frequency is furnished in at least one section which is closer to the inlet box, than within a subsequent section further away from the inlet box.
- The ultrasound elements are suitably arranged so that the ultrasound power (amplitude) and/or the frequency can be controlled. Hereby, an optimisation of the formation will be possible, so that it can be adapted to the composition of the stock. Consequently, flocks which contain larger amounts of fines and fillers should demand a higher frequency than e.g. a stock which is based on a hard wood pulp with short fibers, which may demand a somewhat lower frequency. The lowest frequency should be demanded in connection with the dispersion of fibers from soft wood pulp with long fibers. Also the wire speed has effect on suitable frequency and/or power. The optimisation of the frequency and power of the ultrasound elements can of course be made by means of a parent control and regulation equipment.
- The ultrasound elements may consequently operate sequentially by changing the frequency and/or power or also the elements may be dedicated for certain prechosen frequencies and/or powers which attack certain flock sizes or a certain content of flock. One aspect of the invention is characterised in that the ultrasound elements are equipped to operate in this way. Further features and aspects of the invention are apparent from the subsequent claims.
- It is also possible to place ultrasound elements in direct contact with press felts, formation wires and/or drying wires in order to clean these felts and/or wires. A water spray can be positioned either on the same side as the ultrasound element or on the opposite side in order to supply the water volume which is necessary to transmit the ultrasound from the element to the inner structure of the felt or wire.
Claims (16)
1. Method to improve, in the production of a web which to an essential part consists of cellulosic fibers, the formation of the web material in a one or plural wire machine by, to an essential part, dispersing existing flocks in the stock which is led from an inlet box out onto at least one wire, and to counteract the reformation of flocks in the stock on the wire, characterised i n that ultrasound energy as ultrasound waves with frequencies between 15 and 75 kHz is furnished to the stock in at least one wire section.
2. Method according to claim 1 , characterised in that the ultrasound energy is furnished to the stock on the wire within at least one cross directional section of the wire section along the transport direction of the stock on the wire.
3. Method according to claim 2 , characterised in that the ultrasound energy is furnished to the stock on the wire within a plurality of cross directional sections which are arranged after each other.
4. Method according to claim 3 , characterised in that the ultrasound energy is furnished to the stock within three to five cross directional sections which are arranged after each other.
5. Method according to any of claims 1-4, characterised in that the ultrasound energy is furnished to the stock within at least some section where the stock on the wire has a concentration (dry content) of between 0,2 and 6%, preferably between 0,5 and 5% or between 1 and 6%, suitably between 1,5 and 5%.
6. Method according to claim 5 , characterised in that ultrasound energy also is furnished to the stock within at least some section where the concentration of the stock is 5-15%, preferably 6-12%.
7. Method according to any of claim s 1-5, characterised in that the ultrasound energy is furnished to the stock within the area of the first half of the wire section.
8. Method according to any of the preceding claims, characterised in that the ultrasound waves which are furnished to the stock have different frequencies within at least a couple of said sections.
9. Method according to claim 8 , characterised in that the ultrasound has a higher frequency within at least one section which is closer to the inlet box than a subsequent section further away from the inlet box, within which subsequent section the ultrasound has a lower frequency.
10. Device for performance of the method according to any of claims 1-9, characterised in that ultrasound elements which transmit the ultrasound energy to the stock are arranged in a wire loop in contact with the inside of the wire in the loop in the area of the distribution of the stock and thus also in contact with the liquid in the stock via the wire and via the mesh interspaces in the wire for transmission of the ultrasound energy to the stock via the wire and directly to the liquid phase via the mesh interspaces.
11. Device according to claim 10 , characterised in that ultrasound elements are arranged in a sub loop and/or in a top loop.
12. Device according to claim 11 , characterised in that ultrasound elements are arranged opposite each other in a sub wire loop and in a top wire loop.
13. Device according to any of claims 10-12, characterised in that the ultrasound elements and/or ultrasound generators which are connected to the ultrasound elements are adjustable in respect of power and/or frequency which is transmitted to the stock.
14. Device according to any of claims 10-13, characterised in that the ultrasound elements consist of separate units.
15. Device according to any of claims 10-13, characterised in that the ultrasound elements are integrated with one or some dewatering elements of the type which include formation tables, foils and suction boxes.
16. (Amended) Method for improving the formation of a web material in a wire machine, comprising:
dispersing existing flocks in stock which is transported along a transport direction from an inlet box onto a plurality of wire sections which are arranged after each other along said direction of travel; and
counteracting the reformation of flocks in the stock on the wire by furnishing ultrasound energy as ultrasound waves with frequencies between 15 and 75 kHz to the stock [to] on said plurality of wire sections;
wherein the ultrasound has a higher frequency within at least one section which is closer to said inlet box than a subsequent section further away from said inlet box, within which subsequent section the ultrasound has a lower frequency.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/021,022 US20020050328A1 (en) | 1997-03-20 | 2001-12-19 | Method and device in the production of a web material |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SEPCT/SE97/00466 | 1997-03-20 | ||
PCT/SE1997/000466 WO1998041683A1 (en) | 1995-10-13 | 1997-03-20 | Method and device in the production of a web material |
US38138299A | 1999-10-07 | 1999-10-07 | |
US10/021,022 US20020050328A1 (en) | 1997-03-20 | 2001-12-19 | Method and device in the production of a web material |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US38138299A Continuation | 1997-03-20 | 1999-10-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20020050328A1 true US20020050328A1 (en) | 2002-05-02 |
Family
ID=20405745
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/021,022 Abandoned US20020050328A1 (en) | 1997-03-20 | 2001-12-19 | Method and device in the production of a web material |
Country Status (5)
Country | Link |
---|---|
US (1) | US20020050328A1 (en) |
EP (1) | EP0968329B2 (en) |
AT (1) | ATE352661T1 (en) |
DE (1) | DE69737300T3 (en) |
PT (1) | PT968329E (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030188842A1 (en) * | 2000-05-08 | 2003-10-09 | Dieter Ronnenberg | Influencing the profile of the properties of a web by means of an acoustic field |
US20040104179A1 (en) * | 2001-12-11 | 2004-06-03 | Bo Nilsson | Ultrasonic transducer system |
US20050000914A1 (en) * | 2003-06-27 | 2005-01-06 | Hakan Dahlberg | Ultrasonic transducer system |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1005530A (en) † | 1947-08-01 | 1952-04-11 | Improvements in mechanical papermaking | |
FR2110591A5 (en) † | 1970-10-16 | 1972-06-02 | Beloit Corp | Paper stock distributor - homogenising particle distribution using gravity agitation and compression waves |
FI61735C (en) † | 1981-03-16 | 1982-09-10 | Valmet Oy | FOERFARANDE I SAMBAND MED PAPPERSTILLVERKNING |
US4735868A (en) † | 1986-05-27 | 1988-04-05 | Olin Corporation | Composites having improved resistance to stress relaxation |
US4999088A (en) † | 1989-04-24 | 1991-03-12 | Tim Tikkanen | No-box system with booster head spray for delivering paper stock to a paper machine |
SE9401272L (en) † | 1994-04-14 | 1995-10-15 | Bo Nilsson | Use of ultrasound in papermaking |
-
1997
- 1997-03-20 EP EP97921016A patent/EP0968329B2/en not_active Expired - Lifetime
- 1997-03-20 DE DE69737300T patent/DE69737300T3/en not_active Expired - Lifetime
- 1997-03-20 PT PT97921016T patent/PT968329E/en unknown
- 1997-03-20 AT AT97921016T patent/ATE352661T1/en active
-
2001
- 2001-12-19 US US10/021,022 patent/US20020050328A1/en not_active Abandoned
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030188842A1 (en) * | 2000-05-08 | 2003-10-09 | Dieter Ronnenberg | Influencing the profile of the properties of a web by means of an acoustic field |
US20060157213A1 (en) * | 2000-05-08 | 2006-07-20 | Dieter Ronnenberg | Influencing the profile of the properties of a web by means of at least one acoustic field |
US20040104179A1 (en) * | 2001-12-11 | 2004-06-03 | Bo Nilsson | Ultrasonic transducer system |
US7147755B2 (en) * | 2001-12-11 | 2006-12-12 | Ultra Technology Europe Ab | Ultrasonic transducer system |
US20050000914A1 (en) * | 2003-06-27 | 2005-01-06 | Hakan Dahlberg | Ultrasonic transducer system |
US7261823B2 (en) * | 2003-06-27 | 2007-08-28 | Ultra Technology Europe Ab | Ultrasonic transducer system |
Also Published As
Publication number | Publication date |
---|---|
EP0968329B1 (en) | 2007-01-24 |
EP0968329B2 (en) | 2012-04-04 |
DE69737300T2 (en) | 2007-08-30 |
EP0968329A1 (en) | 2000-01-05 |
PT968329E (en) | 2007-04-30 |
DE69737300D1 (en) | 2007-03-15 |
DE69737300T3 (en) | 2012-10-25 |
ATE352661T1 (en) | 2007-02-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |