CN108179651B - Forming section - Google Patents
Forming section Download PDFInfo
- Publication number
- CN108179651B CN108179651B CN201711255641.1A CN201711255641A CN108179651B CN 108179651 B CN108179651 B CN 108179651B CN 201711255641 A CN201711255641 A CN 201711255641A CN 108179651 B CN108179651 B CN 108179651B
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- China
- Prior art keywords
- forming
- sleeve roll
- forming section
- section according
- rolls
- Prior art date
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Classifications
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- 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
Abstract
The present invention relates to a kind of forming sections, it includes the double net forming units being formed between off line (10) and online (20), wherein the first de-watering apparatus of double net forming units is the forming rolls (13) with a cornerite (13V).It is sleeve roll (50) and operation between forming rolls (13) and sleeve roll (50) without vacuum dehydration follow forming rolls (13) in double net forming units, i.e., is not provided with vacuum dehydration between forming rolls (13) and sleeve roll (50).
Description
Technical field
The present invention relates generally to production fiber webs.Particularly, the present invention relates to a kind of forming sections.
Background technique
It is known from the prior art that fiber web is by continuous in fiber web machine, particularly paper machine and lap machine
Production and processing is carried out in the component that the multiple devices being arranged in production line are constituted.Typical production and processing line include forming
Portion's (including head box and forming unit) and press section and subsequent drying section and reeling end.Production and processing line can be with
Including other equipment and for the part of finishing fiber web material, such as size press portion, calender, coating part.Production and processing
Line also typically includes at least one reel machine to form user volume and width coil packing device.In the description of the present application and later
Claims in, fiber web particularly relates to container board web or carton board web.
The task of forming unit is to remove moisture removal from the fibrous suspension supplied by head box.When web is by aqueous fiber
Pulp manufacture and when, on forming section by one or more forming nets remove the moisture in paper pulp with start web at
Shape.Fiber is maintained on forming net or is kept together between mobile forming net.According to manufactured web kind, using not
The paper pulp of same type.The water removed from different paper pulp to obtain the web of good quality is related to several factors, such as
The required degree of powder, fiber and packing material in the required base weight of web, the desin speed of machine and finished product.Forming unit
On many types equipment be it is known, such as chaff, suction box, slewing rollers, suction roll and roller equipped with open surface, when
When attempting to optimize water, time and the position of removed water when forming web, these equipment have been used for a variety of differences
Arrangement and array in.The final products and the water of dehydration of the high quality of kind needed for manufacturing, dewatering, dehydration continue
Time is related to the position of dehydration.When needing to be promoted water separation capability and maintaining or improve the quality of final products, repeatedly generate
The problem of fail to predict, result or has to reduce dehydrating amount to keep required quality, or has to sacrifice required matter
Amount is to obtain more waters.
A kind of forming device for fiber web machine is disclosed in patent application publication EP1096067A2, it should
Forming device is configured to gap forming unit, wherein between the pulp suspension from head box is sent between two net rings
In gap, during forming gap is formed between net ring.Gap forming unit includes at least two, is advantageously three rollers, these
Roller is at least partly contacted with two nets.
Disclosed in patent publication us US4,925,531 it is a kind of for paper machine with off line and online double nets
Forming device.Forming device has double net formation zones, which has the formed parts fixed with following particular order
And formation zone.Reclinate formation zone is adapted to be mounted on the sector of the major diameter forming rolls on the frame of lower net unit, should
The size of sector is in the range of < 90 °.It is then followed by the second forming rolls, is provided preferably with hollow face and net from the first one-tenth
Shape roller reaches on the second forming rolls.Double net formation zones are bent in a certain sector less than 90 ° on the second forming rolls, to become
At level.Forming boots are equipped with table top (ribbed deck) with ribbing and are attached in off line ring after the second forming rolls, this
Shaping boots has relatively large bending radius, later double nets shape ends of extent and web be configured to follow it is off line together.
In twin former known in the art, the knot usually in the form of big cornerite and long pulsation forming boots
Forming rolls is closed, good water removal effect is provided but there is very high energy consumption.During dehydration and when dehydration starts, use
Forming rolls, which carries out non-pulsating water removal, condenses fiber web, thus is difficult to reality in the case where not strong and lasting pulsation dehydration
Dehydrating effect needed for existing.
The forming section of these types is usually very high；About 10 meters, thus it is expensive.The height of the opening of head box is usual
At about 8 meters of height level, this is because the big cornerite of forming rolls and long forming boots.Such height will not generate that
More difficulties, but this class formation occurs in the heavy rolls of high-order rotation for being easy to generate vibration, therefore frame and support
Structure needs to determine size according to heavy duty.
Particularly, in terms of production board web the problem of, (causes to shape because of the low concentration of the fibre pulp in head box
The increase of dehydration demand in unit) and when occurring, exist in this kind of forming section and the dehydration of optimization board web and required
The related defect of quality.In general, attempting to solve such defect by the dehydration equipment that forming unit is added, this can increase naturally
Add expense and makes forming section structure is complicated to change.
A kind of forming section is disclosed in patent application publication WO2010046527A1 comprising two net rings and
Subsequent dehydration equipment, described two net annulars barrier in pairs, which includes the dewatering elements for executing preliminary hydro-extraction.Dehydration
Equipment includes fixed support shaft, is supported in fixed support shaft by the support component that impermeability band surrounds.Dehydration equipment
It further include curve drying zone, net is advanced on curve drying zone and supported by band.The bending degree of the curve of curve drying zone
Direction of travel along band increases, so that ever-increasing dewatering pressure is applied to and advances between the net on curve drying zone
Pulp suspension.At least one described curve drying zone of at least one dehydration equipment is made of two local curves, is made
The radius of curvature of first partial curve is greater than second local curve that first partial curve is followed along the direction of travel of web
Radius of curvature.
Summary of the invention
The purpose of the present invention is create the forming section of a kind of defect that the prior art is eliminated or at least reduced and problem.
Particularly, the object of the present invention is to provide a kind of novel forming section, wherein the height of forming section be can reduce.
To achieve the goals above, forming section according to the present invention is mainly rendered as feature described in following description.
According to the present invention, forming section includes being formed in off line double net forming units between online, double net forming units
The first de-watering apparatus be the forming rolls with a cornerite, wherein follow forming rolls in double net forming units be sleeve roll simultaneously
And it is de- to be not provided with vacuum without vacuum dehydration for the operation between forming rolls and sleeve roll between forming rolls and sleeve roll
Water.
Favorable characteristics according to the present invention, sleeve roll include fixed support shaft and are guided around the band of fixed support shaft
Ring, sleeve roll further includes at least one the curve drying zone being made of two local curves, so that first partial song curvature of a curve
Radius follows the radius of curvature of the second local curve of first partial curve greater than the direction of travel along band.
Favorable characteristics according to the present invention, sleeve roll include that fixed support is supported in a manner of at a distance from each other
Support component on axis, is supported around the band of fixed support shaft by support component and band is impermeability.
Favorable characteristics according to the present invention, the distance between forming rolls and sleeve roll are 0.2-2 meters, it is advantageously that 0.3-
1.5 meters, which contacted on sleeve roll in the point terminated on forming rolls with off line and online in off line and online cornerite
Point (that is, it is off line and online start contact sleeve roller point) between measure.
Favorable characteristics according to the present invention, forming unit includes its wet end followed by double wet ends first, and is had
Sharp ground, a wet end is substantially horizontal or tilts.According to favorable characteristics, a wet end includes forming boots, which has
Suction opening in table top and table top.
Favorable characteristics according to the present invention, as online is left and the end of forming unit is formed from off line turning operation
For a wet end, double net forming units are terminated at sleeve roll at a distance.
Favorable characteristics according to the present invention, the total height of forming section is less than 8 meters.
The highest point of favorable characteristics according to the present invention, sleeve roll is in higher vertical position than the minimum point of forming rolls
It sets.
Lot of advantages is realized by forming section according to the present invention.The total height of forming section can reduce even 2-3 meters
And the size of frame and support construction can also be set according to lesser load.The total height of forming section is less than 8 meters.Property
(the especially intensity property of fiber web) is improved as the water of pulsation water removal reduces.In addition, seldom in contact forming section
De-watering apparatus, thus net service life increase and energy consumption reduce.In addition, due to not having between forming rolls and sleeve roll
There is vacuum impulse dehydration, it is achieved that the good intensity property of fiber web.Also achieve the section of investment and use cost
About.Short distance from forming rolls to sleeve roll enables the manufacture of packing board kind to have high quality, high efficiency and ability.
Detailed description of the invention
The present invention is described in detail hereinafter with reference to attached drawing, but the invention is not limited to the contents of shown attached drawing.
An advantageous example of forming section according to the present invention is schematically shown in Fig. 1.
An advantageous example of forming section according to the present invention is schematically shown in Fig. 2.
Forming boots and sleeve roll are especially schematically shown in Fig. 3 A to Fig. 3 B.
Specific embodiment
During being described below, it is identically numbered the difference that the present invention and its advantageous example will be used to refer to symbol
Similar elements in view.For clarity, having had been left out some duplicate appended drawing references in the accompanying drawings.
An example of forming section is shown in FIG. 1, is opened for pair forming section of net forming unit types and with double wet ends
Begin.Forming section includes head box 30, and pulp suspension M is supplied to from head box 30 to be formed as including off line 10 and online 20
The forming unit of double net forming units, each net include for will be net guided and be driven to the roller 12,22 of circulation loop.Paper pulp is outstanding
Supernatant liquid M is first sent in the gap formed between off line 10 and online 20.First de-watering apparatus is the forming with cornerite 13V
Roller 13, the forming rolls 13 are located in the circuit formed by off line 10.Cornerite 13V advantageously 40-110 degree, it is required to ensure
Water separation capability.The advantageously suction roll of forming rolls 13.Forming rolls 13 followed by foil support 26, foil support 26 support off line 10 but
Be not engaged in and be actively dehydrated, only remove moisture removal from the lower surface of net 10 and support net 10 between forming rolls 13 and sleeve roll 50,
20 operation.Foil support 26 is not detached from the operation of net 10,20 and because being applied between net 10,20 without dewatering pressure
Fiber web.Foil support 26 followed by sleeve roll 50, sleeve roll 50 is located in the circuit formed by online 20.Forming rolls 13 with
The distance between sleeve roll 50 L is only about 0.2-2 meters.The distance off line 10 and online 20 cornerite 13V in forming rolls 13
The point that the point of upper termination contacts on sleeve roll 50 with off line 10 and online 20 is (that is, off line 10 and 20 beginning contact sleeve of online
The point of roller 50) between measure.It is not necessary according to the invention that using suction box between forming rolls 13 and sleeve roll 50.Foil support
26 may be located on after sleeve roll 50 for removing moisture removal from the surface of net 10.After sleeve roll 50, fiber web exists
Be guide further between online 20 and off line 10 and with fiber web is transmitted to the pick-up roller 31 of press section at a distance of a spacing
From 20 operation of surfing the Internet is rotated up and leaves off line 10 and the end of forming unit is formed a wet end.In attached drawing
Another de-watering apparatus 16 is shown in example, is located in the circuit formed by off line 10.Another dehydration device 16 may include into
Shape boots and/or pumping equipment.In order to guarantee the low clearance of forming section, at minimum point of the highest point than forming rolls 13 of sleeve roll 50
In higher vertical position.
An example of forming section is shown in FIG. 2, is started with a short wet end, followed by double wet ends.Forming
Portion includes head box 30, pulp suspension M be supplied to from head box 30 be formed as include off line 10 and online 20 double nets at
The forming unit of shape unit, each net include for will be net guided and be driven to the roller 12,22 of circulation loop.Pulp suspension M
Be supplied on off line 10 first and the region of forming boots 17 on, later under online paper pulp be directed into and be formed in off line 10
In gap (the double wet ends for forming forming unit) between online 20.Forming unit starts from short substantially horizontal or inclination
A wet end, which includes removing the forming boots 17 of moisture removal by aspirating and providing accurate control to head box fluid
System aspirates moisture by off line 10, but due to there is no pulsation water removal so that pulp suspension will not jump on net 10
It is dynamic.The first de-watering apparatus in double wet ends is the forming rolls 13 with cornerite 13V, which is located at is formed by off line 10
In circuit.Cornerite 13V advantageously 40-110 degree, to ensure required water separation capability.The advantageously suction roll of forming rolls 13.At
Shape roller 13 followed by foil support 26, foil support 26 support off line 10 but be not engaged in actively be dehydrated, only from the lower surface of net 10
It removes moisture removal and supports the operation of the net 10,20 between forming rolls 13 and sleeve roll 50.Foil support 26 is not detached from net 10,20
Operation and the fiber web because being applied to without dewatering pressure between net 10,20.Between forming rolls 13 and sleeve roll 50
Distance L is only about 0.2-2 meters.The distance off line 10 and surf the Internet 20 cornerite 13V in the point that is terminated on forming rolls 13 under
Net 10 and online 20 contacted on sleeve roll 50 point (that is, off line 10 and online 20 start contact sleeve rollers 50 point) between survey
Amount.It is not necessary according to the invention that using suction box between forming rolls 13 and sleeve roll 50.After sleeve roll 50, web of fiber
Material be guide further between online 20 and off line 10 and with fiber web is transmitted to the pick-up roller 31 of press section at a distance of one
Set a distance, online 20 turn upwards towards operation and leave off line 10 and the end of forming unit is formed a wet end.In attached drawing
Example in another dehydration device 16 is shown, be located in the circuit that is formed by off line 10.Another dehydration device 16 may include
Shape boots and/or water absorption device.This kind of forming section is particularly advantageous for forming the web of higher basis weights, because forming boots 17 reduce greatly
The web layers thickness of about 20-40%, and web is not intended to be extruded between the net on 13 region of forming rolls.
The exemplary forming section of Fig. 1 and Fig. 2 includes double net forming units with sleeve roll, wherein double net forming unit quilts
It is formed between off line 10 and online 20.Due to following position and the first forming rolls of the sleeve roll after the first forming rolls 13
13 at a distance of 0.2-2 meter, be advantageously 0.3-1.5 meter of distance, therefore 20 position height of surfing the Internet can be lowered, and be starched so flowing
The position of case and forming unit can also be lowered.
Forming boots 17 are schematically shown in figure 3 a, and wherein table top 18 includes suction opening 19, passes through the suction opening
Soaking effect is generated to remove moisture removal from pulp suspension and improve the forming of pulp suspension.Advantageously, the design of table top 18
It not will lead to the web pulsation in the beginning of forming boots 17.Opening 19 is formed between multiple foils, these foils have 5-
The distance of the width of 15mm and 5-15mm apart, and advantageously, forming boots 17 are connected to pumping equipment.
It is schematically shown in Fig. 3 B with the sleeve roll 50 of radius to successively decrease comprising fixed support shaft 51, impermeable
Property band 53, support component 52 is supported in fixed support shaft 51 in a manner of being separated by a certain distance, rather than permeability band
53 are guided around the fixation support shaft 51 supported by support component 52.Sleeve roll 50 further includes at least one curve drying zone
K, net 10,20 are directed to be advanced with supporting by band 53 via at least one curve drying zone K.The curve of curve drying zone K
Bending degree increase along the direction of travel of band 53 so that ever-increasing dewatering pressure be applied to it is de- at least one curve
The pulp suspension advanced between net 10,20 on the K of pool.The radius of curvature of curve drying zone K is made of two local curves,
So that the radius of curvature K1 of first partial curve is greater than the second game for following first partial curve K1 along the direction of travel of band 53
The radius of curvature K2 of portion's curve.The radius of curvature of curve drying zone K may include a plurality of curve, so that the row along radius of curvature
Reduce into direction.
Some advantageous examples of the invention are above only described, the invention is not limited to these examples and in this hair
Much remodeling and modification are possible in bright.
Claims (10)
1. a kind of forming section, including the double net forming units being formed between off line (10) and online (20), double net formings
First de-watering apparatus of unit is the forming rolls (13) with a cornerite (13V), which is characterized in that in double net forming units
In, follow the forming rolls (13) is sleeve roll (50), and the sleeve roll (50) includes fixed support shaft (51) and band
(53), the band is guided so that around fixed support shaft (51) circulation, the sleeve roll (50) further includes by two offices
At least one curve drying zone (K) of portion's curve composition, so that the radius of curvature (K1) of first partial curve is greater than along the band
The direction of travel of ring (53) follows the radius of curvature (K2) of the second local curve of the first partial curve, and it is described at
Operation between shape roller (13) and the sleeve roll (50) is without vacuum dehydration, i.e., the described forming rolls (13) and the sleeve roll
(50) vacuum dehydration is not provided between.
2. forming section according to claim 1, which is characterized in that the sleeve roll (50) includes with a spacing apart
From mode be supported on the support component (52) on the fixed support shaft (51), be guided with around the fixed support shaft
(51) band (53) recycled is supported by support component (52) and the band (53) is impermeability.
3. forming section according to claim 1, which is characterized in that between the forming rolls (13) and the sleeve roll (50)
Distance (L) be 0.2-2 meters.
4. forming section according to claim 3, which is characterized in that between the forming rolls (13) and the sleeve roll (50)
Distance (L) be 0.3-1.5 meters.
5. forming section according to claim 1-4, which is characterized in that the forming unit include first follow it is double
One wet end of wet end.
6. forming section according to claim 5, which is characterized in that one wet end is substantially horizontal or tilts
's.
7. forming section according to claim 5, which is characterized in that one wet end include forming boots (17), it is described at
Shape boots have the opening (19) in table top (18) and the table top (18).
8. forming section according to claim 1-4, which is characterized in that as the online (20) is from described off line
(10) turning operation leaves and the end of the forming unit is formed a wet end, double net forming units terminate at
The sleeve roll (50) is at a distance.
9. forming section according to claim 3 or 4, which is characterized in that the total height of the forming section is less than 8 meters.
10. forming section according to claim 3 or 4, which is characterized in that the highest point of the sleeve roll (50) than it is described at
The minimum point of shape roller (13) is in higher vertical position.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP16202857.5A EP3333315B1 (en) | 2016-12-08 | 2016-12-08 | Forming section |
| EP16202857 | 2016-12-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108179651A CN108179651A (en) | 2018-06-19 |
| CN108179651B true CN108179651B (en) | 2019-09-17 |
Family
ID=57530557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711255641.1A Active CN108179651B (en) | 2016-12-08 | 2017-12-04 | Forming section |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP3333315B1 (en) |
| CN (1) | CN108179651B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3913132A1 (en) * | 2020-05-20 | 2021-11-24 | Valmet Technologies Oy | Belt for a sleeve roll and use thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4209360A (en) * | 1978-02-15 | 1980-06-24 | Ab Karlstads Mekaniska Werkstad | Two-sided drainage in a roll-type twin-wire former |
| US4417950A (en) * | 1980-11-26 | 1983-11-29 | Escher Wyss Gmbh | Papermaking machine containing two movable water pervious dewatering bands |
| US4925531A (en) * | 1988-05-23 | 1990-05-15 | Valmet Paper Machinery Inc. | Twin wire former for a paper machine |
| DE19950805A1 (en) * | 1999-10-21 | 2001-04-26 | Voith Paper Patent Gmbh | Former |
| CN101878338A (en) * | 2007-11-28 | 2010-11-03 | 美卓造纸机械公司 | Forming section |
| CN102197177A (en) * | 2008-10-24 | 2011-09-21 | 美卓造纸机械公司 | Forming section |
-
2016
- 2016-12-08 EP EP16202857.5A patent/EP3333315B1/en active Active
-
2017
- 2017-12-04 CN CN201711255641.1A patent/CN108179651B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4209360A (en) * | 1978-02-15 | 1980-06-24 | Ab Karlstads Mekaniska Werkstad | Two-sided drainage in a roll-type twin-wire former |
| US4417950A (en) * | 1980-11-26 | 1983-11-29 | Escher Wyss Gmbh | Papermaking machine containing two movable water pervious dewatering bands |
| US4925531A (en) * | 1988-05-23 | 1990-05-15 | Valmet Paper Machinery Inc. | Twin wire former for a paper machine |
| DE19950805A1 (en) * | 1999-10-21 | 2001-04-26 | Voith Paper Patent Gmbh | Former |
| CN101878338A (en) * | 2007-11-28 | 2010-11-03 | 美卓造纸机械公司 | Forming section |
| CN102197177A (en) * | 2008-10-24 | 2011-09-21 | 美卓造纸机械公司 | Forming section |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3333315A1 (en) | 2018-06-13 |
| EP3333315B1 (en) | 2019-05-01 |
| CN108179651A (en) | 2018-06-19 |
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