CN103842587A

CN103842587A - Calender

Info

Publication number: CN103842587A
Application number: CN201280035433.XA
Authority: CN
Inventors: K·库比克; H·布鲁德尔; U·克勒尔斯; K-H·蒙塔格; J·瓦尔特范
Original assignee: Andritz Kuesters GmbH
Current assignee: Andritz Kuesters GmbH
Priority date: 2011-07-28
Filing date: 2012-07-12
Publication date: 2014-06-04
Anticipated expiration: 2032-07-12
Also published as: EP2913435B1; CN103842587B; EP2737126A1; WO2013013994A1; DE102011052229A1; EP2913435A1; EP2737126B1

Abstract

The invention relates to a calender (100) for treating a product web (1), comprising several rolls (2, 3, 4), wherein at least one hard roll (3) is provided, which together with two soft rolls (2, 4) forms two nips (5, 6), wherein the hard roll (3) is preferably heated, wherein the planes of action (7, 8) of the soft rolls (2, 4) with the hard roll (3) are located at an angle y relative to one another, said angle being smaller than 180 .

Description

Calender

Technical field

The present invention relates to a kind of calender for the treatment of product breadth, comprise multiple rollers, at least one hard roller is wherein set, described hard roller and two soft rollers form two roll gaps, and hard roller is heated.This calender is for example open by DE196 50 576A1.This calender is for two-sided calendering product breadth.

Background technology

Soft roller represents such roller, and it has elasticity cover layer and serves as a contrast in other words face.Hard roller refers to not have this tectal roller.Elasticity cover layer in other words elasticity lining regard to high overrolling frequency (

) and thermotonus sensitivity.Also acutely push lining face by rolling large linear force.Therefore in high-performance calender, (high linear force and temperature and with maximal rate) used two soft rollers, these two rollers are common forms two roll gaps with an other roller, so that in once passing through, realize the effect of wishing by two roll gaps in the situation that at product breadth.

In known calender, disadvantageously, soft roller bears the inhomogeneities in larger thermic load and a roll gap in addition---for example passing through as linear slit based on slubbing---produces considerable influence to another roll gap.

Summary of the invention

The present invention based on task be to propose not have one this class calender and method of above-mentioned shortcoming.

This task is being solved by the calender providing in claim 1 aspect its device.Calender for the treatment of product breadth according to the present invention comprises multiple rollers, and at least one hard roller is wherein set, and described hard roller and two soft rollers form two roll gaps.Multiple hard rollers also can be set, and they form two roll gaps with two soft rollers respectively.But just what a hard roller is preferably set, and this hard roller and two soft rollers form two roll gaps.Described at least one hard roller is preferably heated.Soft roller forms with the acting surface of hard roller the angle γ that is less than 180 ° to each other.Soft roller refers to by the plane of the rotation of hard roller and the definition of the rotation of corresponding lining face roller with the acting surface of hard roller.

Realize thus multiple advantages: reduced on the one hand the thermic load that soft roller is subject to based on convection current due to hard roller.On the other hand, in the time that two soft rollers form with the acting surface of hard roller the angle that is less than 180 ° to each other, in other words,, in the time that two acting surfaces of two soft rollers are not overlapped into a unique plane, the inhomogeneities in a roll gap affects another roll gap littlely.

Preferably the rotation of hard roller is higher than the rotation of soft roller described at least one, the preferred rotation of two soft rollers.Can reduce thus the thermic load that soft roller is subject to based on hard roller convection current.

In the time that the rotation of two soft rollers is positioned on sustained height, especially, in the time that the diameter of two soft rollers is consistent, soft roller is subject to even and little especially thermic load.

Irrelevant with the uniformity of two soft roller diameters, preferably, in the time that hard roller is arranged on two soft roller tops equably,, in the time that two acting surfaces rotate from horizontal line with equal angular on absolute value, soft roller is subject to uniform thermic load.

Roll gap preferably can be controlled independently of one another.Therefore the linear force that the linear force in a roll gap preferably can be independent of in another roll gap is controlled adjusting in other words.

Optimized angle γ is between 110 ° and 70 ° and be further preferably about 90 °.In the time that angle γ is 90 °, two acting surfaces are perpendicular to one another.Therefore inhomogeneities in a roll gap in other words change of linear force minimally affects another roll gap.Based on 90 ° of layouts, roll gap (almost) can change independently of one another and not influence each other.This is particularly favourable in the time that linear slit passes through.Because realized the prerequisite of following process: the first roll gap open, allow slubbing by and again close immediately.During this process, the second roll gap continues calendering, until the online seam of the second roll gap by also open, allow before slightly thickened section by and also again close after this.Therefore can realize: only minimum not by the product loss of calendering.In described process, need only control all the time a pressure (only the pressure of a roller), because 90 ° of layouts prevent that linear force from influencing each other.(γ is not equal to 90 °) in other cases, linear slit by time must regulate corresponding another linear force when roll gap simultaneously, must regulate the pressure of two rollers simultaneously.This is more complicated process in control technology, and this process at least needs the plenty of time and usually produces more defects.

Slubbing sensor is preferably set, the slubbing of this slubbing sensor testing product breadth.Slubbing can be vertical or favour slubbing that direction of advance extends on the whole width of product breadth as linear slit or only appear at the thickened section in region of product breadth.Product web speed is conventionally known by roller rotary speed or can measure by Negotiation speed sensor.

Control device is preferably set, this control device is calculated slubbing by the moment of roll gap and is reduced like this linear force of corresponding roll gap in this moment before slightly by the value of slubbing sensor and product web speed, makes slubbing not causing that roll gap pass through roll gap in the situation that of damage.Preferably linear force is only reduced within the shorter time period.Guarantee in this way when for example linear slit is by roll gap, not cause the damage on calender and guarantee on the other hand product breadth not to be loaded the section of pressure by hope as far as possible little.

Linear force in roll gap changes and preferably changes to realize by the pressure of soft roller.

Especially at the acting surface of soft roller and hard roller to each other in shape embodiment at an angle of 90, control device preferably reduces the linear force of roll gap like this, and the time period that the linear force of two roll gaps is reduced is not overlapping.This is possible, because 90 ° of layouts prevent that linear force from influencing each other.

Preferably described at least one, soft roller is that deflection is controlled.Particularly preferably two soft rollers at least one, preferably two soft rollers are dancer.Dancer refers to such roller, its have around formation working roll circumference hollow roll and run through hollow roll and the non-rotatable transverse arm of inner periphery hollow roll around ground partition distance according to length.In space between hollow roll and transverse arm, form the pressure chamber that at least one can be filled pressure fluid, this pressure chamber separates by sealing device.The longitudinal sealing device that sealing device has end cross sealing device and longitudinally extends on the acting surface both sides of roller along transverse arm and hollow roll on the end of putting toward each other of pressure chamber, described sealing device is the form of sealing strip.This roller is for example open by DE3832405C1.

Advantage of the present invention is particularly suitable for this.Because dancer has steel pipe (hollow roll), this steel pipe must have certain degree of hardness rigidity in other words by designing decision.Therefore in the time that passing through roll gap, slubbing produces relatively large inhomogeneities in this roll gap, because dancer for example " point-like " adapts to the slubbing of expection.In the whole length of roll gap, produce sizable inhomogeneities based on its rigidity.In order to reduce the linear force in roll gap for slubbing, the in the situation that of dancer, need to change in addition multiple pressure parameters.This needs the time.In a preferred embodiment acting surface to each other the layout of 90 ° guarantee this second roll gap be only subject to minor impact and product breadth defect section keep shorter.

In one embodiment, soft roller described at least one, preferably two soft rollers are plunger rollers that support and that preferably have internal end of travel, preferably form lining face cover layer in other words at the situation lower roll pipe of this roller simultaneously.The slubbing of expection can be in roll gap inhomogeneities generally less shorter in time in other words by this roller.But also very advantageously, the thermic load that soft roller is subject to based on hard roller convection current is reduced in calender according to the present invention in this soft roller.

Described task is solving by the method providing in claim 10 aspect its method.The method comprises the steps:

-product breadth is guided through to a roll gap being made up of hard roller and soft roller;

-preferably make product breadth turn to around slewing rollers;

-product breadth is guided through to the second roll gap, this second roll gap is made up of the second soft roller and same hard roller, and soft roller forms with the acting surface of hard roller the angle γ that is less than 180 ° and is preferably about 90 ° to each other.

Following further method step is preferably set:

-before slubbing arrives roll gap, detect the slubbing that is arranged in product breadth;

-determine that slubbing is by the moment of roll gap;

-reduce respectively the linear force in roll gap in this moment before slightly, make slubbing not causing that soft roller lining face pass through roll gap in the situation that of damage;

-improve linear force to initial value.

Especially in angle γ is about the method embodiment of 90 °, linear slit by time be preferably as follows and carry out: the first roll gap open, allow slubbing by and preferably again close immediately.During this process, the second roll gap preferably continues calendering, until the online seam of the second roll gap by also open, allow before slightly thickened section by and also again close after this.Therefore can realize: only minimum not by the product loss of calendering.In described process, need only control all the time a pressure (only the pressure of a roller), because 90 ° are arranged in this and prevent that linear force from influencing each other.

Therefore, preferred non-while of the linear force of two roll gaps but reduce in time with staggering.The time that the linear force of two roll gaps is reduced is preferably not overlapping.The linear force of roll gap is preferably separate or be almost changed independently of each other.Therefore the linear force distribution curve of another roll gap is not preferably considered in the control of the linear force of a roll gap.

In the another kind of embodiment of the method, angle γ be not equal to 90 ° and linear slit by time regulate corresponding another linear force simultaneously.Preferably regulate the pressure of two rollers simultaneously and further preferably regulate associated with one another.This is in control technology, to be more complicated process, and this process at least needs the plenty of time and usually produces more defects.

Brief description of the drawings

Describe the present invention in detail by accompanying drawing illustrated embodiment below.Accompanying drawing is as follows:

Fig. 1 is by the disclosed calender of prior art, and it is vertical that two soft rollers and the acting surface of hard roller are overlapped into unique plane and this plane therein;

Fig. 2 is a kind of calender, and the acting surface of two soft rollers and hard roller is overlapped into a unique plane and the extension of this planar horizontal therein;

Fig. 3 is a kind of calender, therein the acting surface of two soft rollers and hard roller to each other shape at an angle of 90 and the rotation of hard roller higher than the rotation of one of rotation of soft roller and two soft rollers not on sustained height, but the rotation of a soft roller with the rotation of hard roller on a height;

Fig. 4 is a kind of calender, therein the acting surface of two soft rollers and hard roller to each other shape at an angle of 90 and the rotation of hard roller higher than two rotations of soft roller and the rotation of soft roller on sustained height;

Fig. 5 is a kind of calender, the rotation that two soft rollers and the acting surface of hard roller form about hexagonal angle γ and hard roller to each other therein higher than two rotations of soft roller and the rotation of soft roller on sustained height.

Detailed description of the invention

The calender representing taking Reference numeral 100 on the whole, as the three roller calenders with two roll gaps that can independently control are for two-sided calendering product breadth, comprises a heated backing roll 3 and two controlled bending controlled

rollers

2,4 with elasticity lining face in other words of deflection.Hard roller 3 is heated steel rider in the embodiment shown.

Soft roller

2,4 is the consistent dancer of diameter in the embodiment shown.Described soft roller also can be by temperature adjustment.

Fig. 1 illustrates a kind of by the disclosed calender of prior art, and all three roll axis are vertically arranged in a vertical plane up and down overlappingly therein.At this disadvantageously, the convection current suffered thermic load of the soft roller 2 of upside based on heated hard roller 3---represents---larger in Fig. 1 with waveform arrow.

Fig. 2 illustrates a kind of calender, and all three roll axis are in a horizontal plane therein.Compared with layout in Fig. 1, the convection current again representing by waveform arrow makes soft roller be subject to lower thermic load.

Shown in Figure 5 according in calender of the present invention, the acting surface of two

soft rollers

2,4 and hard roller 3 forms the angle γ of approximately 120 ° to each other.The acting surface of two

soft rollers

2,4 and hard roller 3 intersects on the rotation 9 of hard roller.From this intersection axis, each acting surface be divided into corresponding soft roller

rotation place region

7a or 8a and there is no region 7b or the 8b of other rotation.In the scope of the literature, acting surface angle γ to each other refers to the angle between

acting surface region

7a, 8a all the time, and the rotation of soft roller is also arranged in described acting surface region.Influencing each other of calender

center roller gap

5,6 at Fig. 5 is less than influencing each other of the calender center roller gap shown in Fig. 1 and 2.Hard roller 3 is arranged on two

soft roller

2,4 tops equably.Two

rotations

10,11 of two

soft rollers

2,4 on sustained height and two soft rollers there is same diameter, thereby the acting

surface

7,8 of two

soft rollers

2,4 respectively with horizontal line form 30 ° of angle α, β.In other words, two

acting surfaces

7,8 rotate from horizontal line H with equal angular α, β on absolute value.The thermic load that soft roller is subject to is less than the thermic load being subject in the calender shown in Fig. 1 and 2.

Fig. 3 illustrates a kind of calender 100, and therein, acting surface 8 shapes of the acting surface 7 of a soft roller 2 and hard roller 3 and another soft roller 4 and hard roller 3 at an angle of 90.The rotation 10 of a soft roller 2 is arranged on sustained height with the rotation 9 of hard roller 3.Because

soft roller

2,4 is not all arranged on heated hard roller 3 tops, so the thermic load that soft roller is subject to based on hard roller convection current (again illustrating with waveform arrow) is better than the thermic load being subject in the calender shown in Fig. 1 and 2.To be arranged on the thermic load that shown in thermic load that the soft roller 2 on equal height is subject to and Fig. 2, the soft roller in calender is subject to identical with hard roller 3.The soft roller 4 that is arranged on hard roller 3 belows is subject to few thermic load.Due to two acting surfaces each other shape at an angle of 90, so the minimum that influences each other of

roll gap

5,6 is also less than the calender shown in Fig. 5.When in the time that seam is carried out calendering with different linear forces in

roll gap

5,6 in other words, the deflection being caused by roll gap 5 of heated roller 3 is just in time extended (vice versa) perpendicular to the pressure-acting line of roll gap 6.The sweep error occurring is subsequently very little and can ignore (only reducing respectively linear force).

Fig. 4 illustrates a kind of calender 100, therein the

acting surface

7,8 of two

soft rollers

2,4 and hard roller 3 also shape γ at an angle of 90 to each other.Different from the calender of Fig. 3, the

rotation

10,11 of two

soft rollers

2,4 is arranged on sustained height.Hard roller 3 is arranged on two

soft roller

2,4 tops equably.Two acting surfaces rotate from horizontal line with equal angular on absolute value.Two

soft rollers

2,4 therefore same degree ground are subject to thermic load because of convection current.As in Fig. 3, the minimum that influences each other of two roll gaps 5,6.Calender shown in Fig. 4 has the optkmal characteristics of all calenders that illustrate.

In the calender shown in Fig. 3,4 and 5, product breadth 1 is conducted through a roll gap being made up of hard roller 3 and soft roller, and then turn to around slewing rollers, subsequently by the second roll gap, this roll gap is made up of the second soft roller and same hard roller 3, and the

acting surface

7,8 of two

soft rollers

2,4 and hard roller 3 forms and is less than the angle γ of 180 ° to each other.In the calender of Fig. 3 and 4, this angle γ is about 90 °.

As clearly visible in Fig. 5, particularly importantly, when slubbing 13 should make defect (product not being flattened along direct of travel) minimum as linear slit during by calender 100.This is determined and is regulated foundation of parameter, this adjusting parameter and elimination (realize and cancel) and two

roll gaps

5,6 independence to each other to realize by " fast ".Regulate the adaptation of parameter and new linear force less, linear slit is by faster and have a minimum defect.In the time that slubbing 13 is reported as linear slit, unshowned control device is determined in the situation that considering product web speed in the accompanying drawings, and when this slubbing is by roll gap 5 and roll gap 6.Slubbing 13 be about to by the first roll gap 5 slightly before, reduce like this linear force in this roll gap, make slubbing can in the situation that not damaging soft roller plastic lining face, pass through roll gap 5.After this first pass, slubbing is for the first time through after a roll gap, the linear force of this roll gap is increased to initial value again.In the time that slubbing 13 is about to arrive on the second roll gap 6, also reduce the linear force in this roll gap 6 at this, to reduce the impact that slubbing passes through.After this, extruding force is increased to previous value again.Wish to control like this

roll gap

5,6 at this, make influencing each other of they as far as possible little.The movement of the pressure spot causing because of load change on the roller bearing of heated roller 3 in addition should not cause the discontinuity of process.90 ° of layouts are as shown in Figures 3 and 4 very suitable for this, especially in the time that preferably two

soft rollers

2,4 are dancer, because the deflection of dancer is subject to the hardness stiffness limits of the steel pipe of system (hollow roll) in other words of design itself.For for slubbing reduces the linear force in roll gap, the in the situation that of dancer, need to change multiple pressure parameters.This spended time.Therefore particularly advantageously, the change of a roll gap neutral line power affects another roll gap as small as possible.

In the roller with internal end of travel supporting at plunger, therein roller pipe also represent simultaneously lining face and---because roller pipe only has little elastic modelling quantity---without the bending force outside quota (not shown in the accompanying drawings), control when slubbing passes through is thus simpler, because only need change hydraulic pressure (plunger) pressure.The independence of two roll gaps this without with in dancer, there is same degree.Disadvantageously, the roller pipe based on softer (having in other words the roller pipe compared with small elastic modulus) is difficult to even can not realize the high accuracy (cylindrical shape, circular motion, identical wall thickness) of roller.Although only need the little power that arches upward (pipe bending force) at this soft roller, but the arrangement according to the invention of such roller remains favourable because in this case to reduce the below that soft roller is positioned heated roller 3 by the thermic load of soft roller as far as possible be far also favourable.

Reference numerals list

100 calenders

1 product breadth

2,4 soft rollers

3 hard rollers

5,6 roll gaps

7,8 acting surfaces

7a, 8a acting surface region

The rotation of 9 hard rollers

10, the rotation of 11 soft rollers

12 slubbing sensors

13 slubbings, as linear slit

α, β, γ angle

G gravity

H horizontal line

Claims

1. for the treatment of the calender (100) of product breadth (1), comprise multiple rollers (2,3,4), at least one hard roller (3) is wherein set, described hard roller and two soft rollers (2,4) form two roll gaps (5,6), and hard roller (3) is preferably heated, it is characterized in that, described soft roller (2,4) forms with the acting surface (7,8) of hard roller (3) angle (γ) that is less than 180 ° to each other.

2. according to the calender of claim 1, it is characterized in that, the rotation (9) of described hard roller (3) is higher than the rotation (10,11) of soft roller described at least one (2,4).

3. according to the calender of claim 1 or 2, it is characterized in that, the rotation (9) of described hard roller (3) is higher than the rotation (10,11) of described two soft rollers (2,4).

4. according to the calender of one of claims 1 to 3, it is characterized in that, the rotation (10,11) of described soft roller (2,4) is positioned on sustained height.

5. according to the calender of one of claim 1 to 4, it is characterized in that, described angle (γ) is between 110 ° and 70 ° and be preferably about 90 °.

6. according to the calender of one of claim 1 to 5, it is characterized in that, slubbing sensor (12) is set, the slubbing (13) of this slubbing sensor testing product breadth (1), be provided for device and the control device of testing product web speed, described control device is calculated slubbing (13) by the moment of roll gap (5,6) and is reduced like this linear force of corresponding roll gap (5,6) in this moment before slightly by the value of slubbing sensor (12) and product web speed, makes slubbing can in the situation that not causing damage, pass through roll gap (5,6).

7. according to the calender of claim 6, it is characterized in that, described control device reduces the linear force of roll gap (5,6) like this, and the time that the linear force of two roll gaps (5,6) is reduced is not overlapping.

8. according to the calender of one of claim 1 to 7, it is characterized in that, soft roller described at least one (2,4) is that deflection is controlled and be preferably dancer.

9. according to the calender of one of claim 1 to 7, it is characterized in that, soft roller described at least one (2,4) is that deflection is controlled, plunger roller that support and that have alternatively internal end of travel, forms lining face at the situation lower roll pipe of this roller simultaneously.

10. for the method for calendering product breadth, comprise the steps:

-product breadth (1) is guided through to a roll gap being made up of hard roller (3) and soft roller;

-product breadth (1) is turned to around slewing rollers;

-product breadth (1) is guided through to the second roll gap, this second roll gap is made up of the second soft roller and same hard roller (3), wherein, soft roller (2,4) forms with the acting surface (7,8) of hard roller (3) angle (γ) that is less than 180 ° and is preferably about 90 ° to each other.

11. according to the method for claim 10, further has following method step:

-detection is arranged in the slubbing (13) of product breadth (1);

-determine that slubbing passes through the moment of roll gap (5,6);

-reduce respectively the linear force in roll gap (5,6) in this moment before slightly, make the slubbing (13) can be by roll gap (5,6) in the situation that not causing that soft roller (2,4) lining face damages;

-improve linear force to initial value.

12. according to the method for claim 11, it is characterized in that, the time that the linear force of described two roll gaps is reduced is not overlapping.