EP1026317B1 - Calender - Google Patents

Description

The invention relates to a calender with a roll stack, which has several rollers between them Form nips for the treatment of a material web, and with an insertion aid to guide the start of a material web through the roll stack.

Such a calender is known from EP 0 232 689 A2.

The invention is based on a paper web described as an example of the material web. she is but also analogously for other material webs that are in a calender must be treated, applicable.

The formation of the rollers plays for the present one Invention doesn't matter. Both "hard" alternate with "soft" rollers and so-called "soft" Form nips or nips. The calender can also have only or predominantly hard rollers.

The treatment of the paper web in the calender, the so-called Satinizing, often takes place in the so-called offline mode, i.e. the paper web is made of a drum unwound, passed through the calender and on wrapped up in a new drum. Even if you here a so-called flying splice flying change between used and new reels from time to time it is necessary that Leading the beginning of the paper web through the roll stack, for example after a web break. This threading can either be done manually, which is usually two Requires operators on either side of the Roll stack stand. The paper web is on its tip folded in an arrow shape and through the pushed the first nip. On the other hand, the Operator against the paper web, it leads if necessary around deflection devices, such as guide rollers, around and leads them to the next desired nip again. This approach is relatively time and labor-intensive. Even if the paper web here only at a relatively slow speed of 10 to 20 m / min. is moved, it can easily be dangerous Situations or even accidents.

EP 0 232 689 A2 therefore shows the possibility of introduction to automate the paper web. This is between two nips, i.e. on one roller each, a web guiding device arranged a Guide surface and additionally has a blowing device. The path hitting the guide surface becomes then with the help of the blowing device along the guide surface pushed in the desired direction.

A calender constructed in this way can in some ways operated automatically. Is also the danger that there are personal injury accidents when threading comes, much less. The effort and therefore however, the costs for the web guiding device are very high. To make matters worse, the accessibility of the calender drastically during operation is restricted. If there is a web break comes, which can not reliably avoid in practice leaves, then the web guiding device can be dangerous Paper jams and the resulting damage lead on rollers and other equipment. The view of the running paper web is blocked and the roller change is difficult.

Other examples of web guiding devices are known from DE-C-36474 and US-A-2 755 711.

The invention is based, in operation To reduce the possibility of malfunctions using the insertion aid.

This task is performed on a calender of the type mentioned at the beginning Art solved in that at least one On the side of the roll stack, a web guiding device movable along the roll stack is arranged in at least one Insertion position can be determined.

By "side" is not meant the face, but the front or back of the roll stack, at which the material web must be deflected in order to desired next nip to be led.

You take advantage of a mechanized system without having to accept its disadvantages. The web guiding device stands for threading the At the beginning of the material web in the calender available. Here, however, one comes with a far lower one Construction work out because the web guiding device from be moved from one insertion position to the next can. So if the tip of the material web into one The web guiding device has been introduced at this position their duty is done and is no longer necessary there. In the time the paper web on the other side of the roll stack, to be redirected and led into the next nip, the web guiding device can move to this nip or moved to the top of the web to receive there and in turn to the desired one to transport the next nip. Based on these Movement of the paper guide device is clear that most nips in operation are free from the web guiding device are so that they do not cause interference can lead in operation. Nevertheless, threading can be done or largely automate the introduction of the material web or at least mechanize, so that the risk of accidents remains small for an operator.

The web guiding device is preferably in one Park position definable, in which no nip through the Web guiding device is covered. In operation can then the web of material can be observed just like on a calender that has been threaded by hand is. The monitoring options are thus complete significantly improved. The possibility of interference becomes reduced even further.

There is an advantage on the side of the roll stack Moving platform arranged and the rail guide device is attached to the driving platform. Driving platforms are anyway present in many calenders. They are used for maintenance purposes used, for example, for storage of to replace or fix the rollers to be replaced.

So far, you can also use manual threading the paper web can be used. With this driving platform is already available without major additional effort Transport medium for the web guiding device Available.

Position switches are preferably along the movement path provided, each of which is an insertion position is assigned and that with a drive control are connected. This allows the movement sequence the web guiding device automatically or at least can be controlled semi-automatically. The web guiding device is moved to the positions where they receive the tip of the material web and / or can pass on to the next desired nip. The Position is determined by the position switch. If the web guiding device in the next Position is moved, it also actuates the Position switch and thus reports that it has been reached Drive control. In the drive control you can however, provide that the web guiding device does not have to stop in every position, for example then when some nips when treating the Paper web to be skipped.

The web guide device advantageously has a guide surface arrangement on. The top of the paper web meets the guide surface arrangement and is from this is directed in the desired direction. Here is the design effort is relatively low.

The guide surface arrangement preferably has a changeable form. One can use the guide surface arrangement then use it as a "switch". This makes it possible to either put the paper web straight in to lead the next nip of the roll stack, or some Skip nips and run the paper web in parallel to the roll stack if this is for treatment the paper web is desired.

It is particularly preferred that the guide surface arrangement one essentially parallel to the direction of movement level surface and a movable out of the surface just formed Has deflection surface. As long as the deflection surface is not protrudes over the surface just formed, the Paper web essentially parallel to the roll stack can skip some nips. However, will the deflection surface from the surface just formed moved out, then the paper web is redirected, to be introduced to the next nip.

A preferred embodiment is provided here that the deflection surface is arranged on swivel levers. The deflecting surface is thus folded out, so to speak.

In another embodiment, it can be provided that the deflecting surface on a cross to the direction of movement slidable sliding piece is arranged. Both Designs can of course also be combined, if this is for constructive reasons or out Space makes sense. While in the first case one Change of the guide surface geometry by a Swiveling movement of the swivel lever is caused. The Geometry in the second case by a linear movement changed.

The guide surface arrangement preferably has at least a tongue that can be moved up to the roller stack is. This allows the paper web up to the proximity of the nip, in many cases even up to the immediate lead in front of the nip. It is only necessary to that the paper web is supported until them toward an area of the lower roll of the nip lies, in which a further advance of the paper web not due to a too steep roller section is hindered or disturbed.

In a preferred embodiment, the alternative or provided in addition to the guide surface arrangement can be, the web guide device has at least a gripper head in a first movement section perpendicular to the roll stack away from it, in a second movement section parallel to the roll stack and perpendicular in a third movement section to the roller stack is movable on this. Here these three movements do not necessarily have to run completely separate from each other. You can also be combined so that the entire movement of the Gripper head corresponds approximately to a semicircle. The Gripper head can the paper web that is fed through the nip will grab, pull out of the roll stack, to the next desired nip and pull it thread there again. This leads to forced operation, which is particularly advantageous for thinner papers is because their rigidity in some cases not enough to get them through the individual nips slide.

The gripper head preferably has a suction and / or a blowing device. The gripper head does not have to passed through a nip to the paper web threading. Rather, it can stay in front of the nip, to suck up the paper web there. If the gripper head the paper web is ready before the next nip holds, then he can let go and with the help of Blow air through the nip.

The gripper head is preferably 180 ° about an axis rotatable, which runs parallel to the axes of the rollers. This takes into account the fact that the beginning of the paper web in the same way the direction must change to the next desired nip to be introduced.

It is particularly preferred that the gripper head attacks laterally on the material web. Then that leads Do not twist the gripper head to bend the Paper web at its top. The paper web is rather passed relatively smoothly through the nips.

The stack of rollers is preferably inclined. Just with inclined roller stacks, the problem is Threading the paper web is particularly serious. While in many cases, the paper web is still handed in from below can without putting the operator at greater risk exists, this is no longer from above easily possible. The web guiding device, especially on the driving platform, creates a big one here Relief.

Fig. 1

einen Kalander mit einer ersten Ausführungsform einer Bahnführungseinrichtung,

Fig. 2

einen Kalander mit einer zweiten Ausführungsform einer Bahnführungseinrichtung,

Fig. 3

einen Kalander mit einer dritten Ausführungsform einer Bahnführungseinrichtung,

Fig. 4

einen Ausschnitt mit einer gegenüber Fig. 3 abgewandelten Ausführungsform,

Fig. 5

eine Draufsicht auf einen Greiferkopf nach Fig. 4 und

Fig. 6

eine Seitenansicht an einen Greiferkopf.

The invention is described below with reference to preferred embodiments in conjunction with the drawing. Show here:

Fig. 1

a calender with a first embodiment of a web guiding device,

Fig. 2

a calender with a second embodiment of a web guiding device,

Fig. 3

a calender with a third embodiment of a web guiding device,

Fig. 4

3 shows a detail with an embodiment modified compared to FIG. 3,

Fig. 5

a plan view of a gripper head according to FIGS. 4 and

Fig. 6

a side view of a gripper head.

1 shows a calender 1 with a stack 2 Rolls 3, 4, each between nips 5 or roller division form. The axes of the rollers 3, 4 lie here all in one level 6. This level 6 is here Embodiment compared to the vertical direction inclined. The stool is accordingly 7 of the calender inclined. Your edge runs essentially parallel to level 6.

A paper web 8 is guided through the roll stack 2, i.e. the paper web 8 passes through in the illustration 1 all nips 5 of the calender 1. Between individual Nips are deflection rollers or guide rollers 9, 10 provided on which the paper web 8 is deflected by approximately 180 ° becomes. In the calender 1, the paper web 8 (or a corresponding one other material web) with pressure and if necessary also acted on with elevated temperature. The details necessary for controlling these influencing variables are partially shown, but are in not explained further below.

Before starting the treatment of the paper web 8, it is necessary to pass the paper web 8 through the nips, where treatment is desired. In the embodiment 1, these are all nips. One can however, also provide that, for example, two or four Nips are skipped.

To guide the paper web 8 through the nips is one Web guide device 11 is provided. This web guiding device 11 is arranged on a driving platform 12, which is displaceable along a route 13. Such a driving platform 12 is in many calenders anyway available to an operator 14 the opportunity to give maintenance work, for example Rollers 3, 4 to clean or prepare to change the rollers.

The driving platform 12 is on its route 13 in certain Position definable. With that, at the same time a positioning option for the web guiding device 11 created.

On the opposite side of level 6 of the roll stack 2 can be a corresponding driving platform with a corresponding web guide device provided his. For reasons of clarity, however, this is not shown. On this "underside" of the calender 1 in many cases it is sufficient if only one Driving platform provided without web guiding device is.

The web guiding device 11 has in the embodiment 1 a guide surface arrangement on. The guide surface arrangement initially has curved ones Guide surfaces 15, 16 on the pivot levers 17, 18 are arranged. The pivot levers 17, 18 can be done with the help of hydraulic or pneumatic Cylinders 19, 20 are pivoted. Furthermore, one flat surface 21 on a linear guide 22 intended. The pivot levers 17, 18 can, as in the lower position of the driving platform 12 is shown, retracted into the flat surface 21 or how in the upper position of the driving platform 12, from the level Surface 21 can be pivoted out. Both the linear guide 22 and the pivot levers 17, 18 are on one common carrier 23 attached using a further cylinders 24 opposite the driving platform 12 can be raised. Comes in the raised state the entire guide surface arrangement from the chair 7 of the calender free, so that the driving platform 12 without the possibility of interference can be moved.

One hits in the upper position of the driving platform 12 for example, through the nip 25 tapering paper web tip on the curved surface 15 on the swivel lever 17 and is passed through it around the guide roller 26, until it hits the curved surface 16. The Swivel lever 18 then guides the tip of the paper web to the next nip 27. In the period of time on the other side of the roll stack 2 is required to the To receive the tip of the paper web to the next guide roller around and in the next Inserting the nip is sufficient to lift the platform 12 Position to continue, before proceeding like mentions the guide surface arrangement from the chair is moved out. The tip of the paper web 8 runs when threading only at relatively low speeds from about 10 to 20 m per minute.

If desired, close two nips behind the nip 25 skip, then you can fold out the angle lever 18, so that the paper web then along the plane trained surface 21 runs. According to the procedure of Lift by the desired number of positions below, in which the pivot lever 17 has been folded out is, the pivot lever 18 can then be pivoted in again be to the top of the paper web 8 to the to lead the desired nip. It is also possible that Tip of the paper web already with the top of the catch surface 21, if only two Nips are to be skipped and the driving platform 12 already been placed in the correct position is.

In a manner not shown, all Surfaces 15, 16, 21 also have a blown air support have air in the direction of the desired Promotion is blown to advance to facilitate the paper web.

Fig. 2 shows a modified embodiment in which same and corresponding parts with the same Reference numerals are provided.

In contrast to the embodiment according to FIG. 1, the curved surfaces 15, 16 no longer on swivel levers arranged, but on sliding pieces 28, 29, the extended with solid lines and retracted are shown in dashed lines. In addition there is another curved surface 30 is provided on a sliding piece 31 cylinders 19, 20, 32 are provided for actuation, which the sliding pieces 28, 29, 31 compared to the Move carrier 23 perpendicular to level 6. In the withdrawn Condition (shown in dashed lines) the incoming paper web only the just trained one Surface 21 on the linear guide 22 opposite. The entire guide surface arrangement can, as in the design 1 also with the help of the cylinder engine 24 are moved relative to the driving platform 12.

At the top of the sliding pieces 28, 29, 31 that the Roll stack 2 is adjacent, can still be pushed out Tongue 44 may be present. This can be used for insertion the paper web until it touches the corresponding one Roller be advanced so that the tip of the Paper web on a continuous guide surface up can be advanced to the nip.

The flat surface 21 and the curved surfaces 15, 16, 30 can interlock like teeth, i.e. the surfaces are not continuous, but through slots parallel to the direction of web travel interrupted, the partial areas of a surface each arranged in the slots of the other surfaces are.

In the illustrated embodiment, the web guiding device Supply two nips and start the paper web 8 from an intermediate one Receive nip. This further saves time when threading the paper web 8 in the calender 1. 3 shows a further embodiment of a web guiding device, at the same and corresponding to each other Parts have the same reference numerals are.

First there are 13 position switches on the route 32 arranged by an actuating device 33 are operated when the driving platform 12 the corresponding Position switch 32 reached. One not closer The drive control shown can then be the driving platform 12 shut down. Each pair of nipples is a position switch 32 assigned. Another position switch 34 is not assigned to a pair of nipples, but indicates a parking position in which the web guiding device no longer blocks the view of the nips 5.

In contrast to those shown in Figs. 1 and 2 "passive" web guiding devices, where the beginning the material web 8 pushed over guide surfaces 3, it is the embodiment according to FIG. 3 an "active" web guiding device. This is in Fig. 3 only shown schematically for understanding explain how it works.

A gripping head 35 with a funnel-shaped opening 36 is located at the front end of a push rod 37, those with only schematically shown guide means 38 is attached to the driving platform 12. In addition can another suction and blowing device, not shown be arranged on the gripper head 35. How it works this web guide can be like describe as follows. The gripper head 35 is in the position A advanced so that it is opposite the nip 25. A beginning of the paper web that is characterized by the Nip 25 is sucked in and as soon as it reaches position B reached, clamped. The gripper head 35 will then retracted with the guide rod 37 (arrow C). Then the driving platform 12 is parallel to level 6 driven down (arrow D). The guide rod 37 is located then in the position shown in dashed lines. It is also possible to mount the bracket 38 on the driving platform 12 to reach this position. During the movement (D) or afterwards the gripper head 35 rotated by 180 ° and by one Axis 45, which runs parallel to the roller axes. The tip of the paper web is then back on the roll stack 2 directed. After that, the guide rod 37 with the gripper head 35 in the direction of the arrow F advanced until the tip of the next nip 27 is adjacent. The gripper is unlocked and the paper web blown through the nip 27.

The gripper expediently grasps the Side to the top of the paper web. In this case you can always point this tip in the right direction judge.

4 now shows a possible embodiment. The gripper head 35 is on the piston rod 39 of a hydraulic or pneumatic cylinder 40 attached. The Cylinder 40 can on the platform 12 in the direction of Arrow 41 are moved up and down to the in Fig. 4th positions shown behind and in front of the nip. The gripper head can be moved through the cylinder 40 in Direction of the double arrow 42 are moved. Of course it is also possible to move in Combine direction of arrows 41 and 42. In this Fall is not just a rectangular movement, but one can also create a trajectory that is curved is, for example, a circular path.

Fig. 5 shows the gripper head 35 at the front end of the Piston rod 39, as the tip of the paper web 8 from reaches from the side. Now if the gripper head 35, like this is indicated by arrow 43, rotated by 180 ° then the tip of the paper web 8 can be moved around the corresponding one Guide roller 9, 10 are guided around. Fig. 6 shows the gripper head from the side. Not recognizable are just the suction and blowing devices.

Claims (15)

1. Calender having a roll stack which comprises a plurality of rolls which, between themselves, form nips for treating a material web, and having a threading aid for leading a material web start through the roll stack, characterized in that on at least one side of the roll stack (2) there is arranged a web guide device (11) that can be moved along the roll stack and that can be fixed in at least one threading position.
2. Calender according to Claim 1, characterized in that the web guide device (11) can be fixed in a park position (34), in which no nip (5, 25, 27) is covered by the web guide device (11).
3. Calender according to Claim 1 or 2, characterized in that a moving platform (12) is arranged on the side of the roll stack (2), and the web guide device (11) is fixed to the moving platform (12).
4. Calender according to one of Claims 1 to 3, characterized in that along the movement path (13) position switches (32, 34) are provided, each of which is assigned to a threading position and which are connected to a drive control system.
5. Calender according to one of Claims 1 to 4, characterized in that the web guide device has a guide surface arrangement (15, 16, 21, 30).
6. Calender according to Claim 5, characterized in that the guide surface arrangement (15, 16, 21, 30) has a variable form.
7. Calender according to Claim 6, characterized in that the guide surface arrangement comprises a flat surface (21) which runs substantially parallel to the direction of movement, and a deflection surface (15, 16, 30) which can be moved out of the flat surface (21).
8. Calender according to Claim 7, characterized in that the deflection surface (15, 16) is arranged on pivoting levers (17, 18).
9. Calender according to Claim 7 or 8, characterized in that the deflection surface (15, 16, 30) is arranged on a sliding piece (28, 29, 31) which can be displaced transversely with respect to the direction of movement.
10. Calender according to one of Claims 5 to 9, characterized in that the guide surface arrangement has at least one tongue (44) which can be displaced towards the roll stack (2).
11. Calender according to one of Claims 1 to 10, characterized in that the web guide device (11) has at least one gripper head (35) which, in a first movement section, can be moved away from the roll stack (2) at right angles to the latter, in a second movement section, can be moved parallel to the roll stack (2) and, in a third movement section, can be moved towards the roll stack (2) at right angles to the latter.
12. Calender according to Claim 11, characterized in that the gripper head (35) has a suction device and/or a blower device.
13. Calender according to Claim 11 or 12, characterized in that the gripper head (35) can be rotated through 180° about an axis (45) which runs parallel to the axis of the rolls (3, 4).
14. Calender according to Claim 13, characterized in that the gripper head (35) acts laterally on the material web (8).
15. Calender according to one of Claims 1 to 14, characterized in that the roll stack (2) is inclined.

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