DE102018127037B4 - calender - Google Patents

Abstract

Calender (100, 200, 300, 400, 500, 600) for treating a web (1), with a first roller (2), which has an axis (B), with a second roller (3), which has an axis ( C), the first roll (2) forming a nip (4) with the second roll (3) when the calender (100) is in operation, and the axes (B, C) of these rolls (2, 3) form a roll axis plane ( W), and with a displaceable web feed element (5) with which the wrap angle (α) with which the web (1) wraps around the first or second roller (2, 3) up to the entry into the nip (4), is adjustable, the wrap angle (α) during the treatment of the web (1) being adjustable to at least 80 °, preferably from 0 to at least 90 °, characterized in that the calender (100) has a hand guard (11) which comprises a part (12) which maintains its distance (18) from the web (1) when the web feed element (5) is displaced.

Description

The invention relates to a calender for treating a web of material, with a first roll having an axis and a second roll having an axis, the first roll forming a nip with the second roll during operation of the calender and the axes of the rolls forming a nip Define roller axis plane, with a displaceable web feed element, with which the wrap angle with which the web wraps around the first or the second roller up to the entry into the nip can be adjusted.

Such a calender is from DE 38 15 463 C2 known.

The U.S. 4,016,030 A claims a method for papermaking and discloses a calender in which the paper web is guided over a spreader roll onto the surface of a cooled upper roll before it enters a nip. The spreader roller is movable and can be temporarily brought into a lower position in order to simplify the introduction of the paper into the nip.

The DE 44 01 678 A1 shows a calender arrangement with a roller gap formed by a pair of press rollers, in which a further roller can be dipped into the path of the material web in front of the roller gap in such a way that the wrap angle of the material web on the heated press roller increases. The further roller can be moved out of the path of the material web in order to simplify the introduction of the material web into the nip.

The DE 10 2012 210 757 A1 shows a device for measuring the web tension of a fiber web with a guide roller which has sensors for this purpose.

The disadvantage of known calenders is that an adjustment of the wrap angle is not possible in a desirably large range, especially during ongoing production.

The invention has set itself the task of creating a calender which is improved with regard to this disadvantage.

This object is achieved by the calender presented in claim 1.

The calender according to the invention - in particular for textile, fleece, plastic or paper goods webs - comprises a displaceable web feed element with which the wrap angle with which the web wraps around the first or second roller until it enters the nip can be adjusted. The wrap angle can be adjusted up to at least 80 ° during the treatment of the material web.

The angle of wrap is preferably adjustable during the treatment of the material web in a range from 0 ° to at least about 80 °, particularly preferably up to at least about 90 °.

The wrap angle is preferably continuously adjustable. The adjustment of the wrap angle is preferably carried out by moving the web feed element.

The maximum wrap angle is preferably in a range from 80 ° to 270 ° or 90 ° to 180 ° or 90 ° to 120 °.

The area of the calender immediately in front of the nip when viewed in the running direction is referred to as the inlet area in the context of this publication.

In the context of this publication, the term "in the direction of travel in front of" or "in the direction of travel behind" denotes an area that a point on the material line passes through earlier or later.

The invention has several advantages: Since the angle of wrap is adjustable during the treatment of the web, the overall efficiency of the calender is increased compared to a calender in which an adjustment of the angle of wrap requires a production stop. Since no interruption in production is necessary, the production parameters such as the speed of the web, surface temperatures of the rollers and nip load remain constant when the angle of wrap is adjusted. The calender is also easy to use. The wrap angle can preferably be continuously optimized in the entire adjustment range until the desired result, for example the reduction of the air permeability of the material web, is achieved.

The first and / or the second roller can preferably be heated and / or cooled, that is to say can be tempered. The wrap angle can be adjusted for the purpose of preheating or cooling the material web.

At least the temperature-controllable first and / or second roller can preferably be wrapped around by the material web. Due to the wrap, the web can be specifically preheated or pre-cooled. In order to achieve the desired treatment effect, a shorter dwell time of the material web in the nip is sufficient, which in turn enables higher production speeds to be achieved. However, it must be ensured that the angle of wrap is not chosen too large. Because In particular when preheating some products there is otherwise the risk of the web of material melting and sticking to the temperature-controlled roller. An undesirably strong treatment effect can also result from an excessively large wrap angle.

It is also possible to increase the wrap angle when starting the treatment process at the same time as increasing the web speed in order to achieve the desired treatment result and to reduce the amount of scrap as early as possible when starting the treatment process. The material web can be, for example, technical textiles. The material web can be preheated for the purpose of compressing the material web, for example technical textiles. The material web can be cooled for the purpose of calibrating coatings.

The first and / or second roller, in particular the temperature-controllable first and / or second roller, preferably has a metallic surface, for example a chrome-plated surface.

The first and / or second roller, in particular the first or second roller interacting with the temperature-controllable roller, can be of conventional design, for example with a camber or inclination. The first and / or second roller can thus have a roller body formed in one piece with the roller journal.

The first and / or second roller, in particular the first or second roller cooperating with the temperature-controllable roller, can be designed to be deflectable and preferably as a floating roller or as a stamp-supported roller. The first and / or second roller can thus have a roller tube rotatably mounted about a stationary roller axis.

The first and / or second roller, in particular the first or second roller interacting with the temperature-controllable roller, can for example have a metallic surface, a covering, a polyamide jacket or a jacket made of native polymer, for example cotton.

The nip can be horizontal, vertical, or inclined. The roll axis plane of the calender can therefore run horizontally, vertically or inclined. In the embodiment with an inclined nip, the nip is preferably inclined less than plus / minus 30 ° and particularly preferably less than plus / minus 15 ° from the vertical.

In the embodiment with a vertical or inclined nip, the first roller is also referred to as the upper nip-forming roller and the second roller is also referred to as the lower nip-forming roller.

At least the upper nip-forming roller can preferably be tempered.

Preferably, at least the upper nip-forming roller can be looped around by the material web.

The web feed element can be displaceable in such a way that both the first and the second roller can optionally be wrapped by the material web. The web feed element can, for example, be displaceable from a first position, in which the first roller is wrapped by the web of material, into a second position, in which the second roller is wrapped by the web of material.

The calender preferably allows a larger maximum wrap angle on the first roll than on the second roll, or vice versa.

If, as in one embodiment, only either the first or the second roll can be temperature-controlled, then the calender preferably allows a larger maximum wrap angle on this temperature-controlled roll than on the non-temperature-controlled first or second roll.

The calender preferably allows a maximum wrap angle on the first roll, which is in a range from about 80 ° to about 270 ° or about 90 ° to about 180 ° or about 90 ° to about 120 °, and on the second roll a maximum wrap angle, which lies in a range from about 5 ° to about 30 ° and can be about 15 °, or vice versa. Looping around a first or second roller that cannot be temperature-controlled can be desirable, for example, to avoid wrinkles that may occur if there is no looping.

The first and / or the second roller is preferably driven. The driven first and / or second roller is preferably an element influencing the web tension.

The calender preferably has precisely one displaceable web feed element for all the wrap angles that can be achieved with the calender. A further web feed element is therefore preferably not provided for large angles of wrap.

The plane that is formed by the tangents that run parallel to the roll axis plane on the inlet side of the calender on the first or second roll, on which the wrap angle is adjustable up to at least 90 °, is referred to as the tangential plane in the context of this publication designated. The web feed element preferably comprises a web deflecting device with a contact surface on which the web of material rests. The web feed element can preferably be displaced from a first position in which an area of the contact surface that is closest to the tangential plane is on the side of the tangential plane facing away from the nip, into a second position in which this area of the contact surface is closer to the tangential plane, in particular in the tangential plane or on the side of the tangential plane facing the nip.

The web feed element is preferably translationally displaceable and / or rotationally displaceable. The calender preferably has a displacement device for displacing the web feed element. The web feed element can preferably be displaced obliquely to the plane of the roller axis by means of the displacement device. In the context of this publication, a displacement at an angle to the plane of the roller axis is understood to mean, in particular, any displacement that does not run parallel to the plane of the roller axis. The displacement can be linear or non-linear. In the case of a linear displacement, it can be realized with little effort that, as is preferred, both the first and the second roller can optionally be looped around by the web of material. The non-linear displacement is suitable, among other things, when a particularly large wrap angle or a large adjustment range of the wrap angle is to be achieved. The web feed element can preferably be displaced perpendicular to the axes of the first and second rollers by means of the displacement device.

The web deflection device of the web feed element preferably has at least one rod or a roller.

The web feed element can comprise a so-called rotary clamp or be formed by it. The rotary clamp can be designed as a triple rotary clamp and have three path deflection devices. Each path deflection device can be designed as a fixed rod. The rods are preferably in contact with the material web and, due to the friction generated in this way, cause the material web to be tensioned between them and the nip. The rotary tensioner is therefore preferably an element that influences the web tension. One of the rods can be “slotted”, i.e. have a spiral-shaped circumferential groove, in order to achieve a spreading effect of the web of material. The rotary clamp is preferably arranged to be rotatable as a whole, for setting the web tension generated by the incoming web and friction after the rotary clamp, before the nip. To set only small web tensions, one of the bars in the rotary clamp can be rotatably mounted and thus generate little or no friction. In principle, it is conceivable that several rods of the rotary clamp are rotatably mounted, for example two. The rotary clamp can also have exactly two bars.

In one embodiment, the required web tension is built up or adjusted by the web feed element, for example the rotary tensioner, before the nip.

In one embodiment, the web feed element does not have a rotary clamp. In one embodiment, the web feed element has little or no effect on the web tension in front of the nip.

The web feed element can comprise at least one roller, for example two rollers, as a web deflecting device. The rollers can be designed to rotate. The roller or rollers of the web feed element can comprise a deflection roller and / or a spreader roller. In particular in the embodiment in which the web feed element has little or no effect on the web tension, i.e. for example only comprises co-rotating rollers, such as a spreader roller and / or a deflection roller, a pulling mechanism is preferably provided in the running direction in front of the nip, which the before the Nip builds up or sets the required web tension. The pulling mechanism is preferably an element that influences the web tension. The pulling mechanism preferably comprises a drivable and / or brakable roller. The roller can be rubberized. It can be wrapped around by the web. In one embodiment, this roller does not form a tension nip. In another embodiment, the pulling mechanism comprises a further roller which forms a pulling gap with the drivable and / or brakable roller. The pulling mechanism is preferably arranged in front of the web feed element in the running direction and more preferably below the web feed element.

The web feed element can preferably be displaced into a first end position and into a second end position. The end positions preferably define the maximum displacement range of the web feed element. The web feed element preferably has a longitudinal axis, which more preferably runs parallel to the plane of the roller axis. The longitudinal axis particularly preferably runs parallel to the axes of the first and second rollers. An end position plane is preferably spanned by this longitudinal axis in the two end positions. The end position plane is preferably inclined at an angle of inclination to the roller axis plane which is greater than 0 °. The angle of inclination is more preferably greater than 5 ° and particularly preferably less than 60 °.

The web feed element can preferably be displaced, preferably continuously, in intermediate positions between the end positions by means of the displacement device. An intermediate layer plane can be spanned through the longitudinal axis of the web feed element in two different intermediate layers of the web feed element. The intermediate layer plane is preferably inclined at an angle of inclination to the plane of the roller axis. The angle of inclination is preferably greater than 0 °. The angle of inclination is more preferably greater than 5 ° and particularly preferably less than 60 °.

The web feed element can be linearly displaceable. The displacement device preferably comprises a linear guide. The linear guide is preferably inclined at least 5 °, more preferably at least 10 ° and preferably a maximum of 60 °, very particularly preferably a maximum of 30 ° to the plane of the roller axis. It has been shown that if the linear guide is inclined more than 60 ° to the plane of the roll axis, the calender is no longer accessible by an operator in a desirable manner and the free length of the web becomes so great that there is a risk of the web constricting. It has also been shown that if the inclination of the linear guide to the plane of the roller axis is less than 5 °, the displacement device becomes undesirably large. The linear guide preferably runs perpendicular to the axes of the first and second rollers.

The path feed element can be displaceable along a curved path. The curved path can be an arc of a circle or another curved path. The displacement device preferably comprises an arcuate guide, particularly preferably a circular arc guide. The pivot point of the circular arc guide is preferably within the circumference of the first or second roller. It can also be outside. If the pivot point of the circular arc guide coincides with the axis of rotation of the first or second roller, then the roller bearing can serve for the arc guide of the web feed element. The pivot point of the circular arc guide can, however, also lie at another location inside or outside the circumference of the first or second roller. In the case of a curved path that is not curved as a circular arc, the centers of curvature preferably lie within the circumference of the first or second roller. They can also be outside.

The displacement device preferably enables a maximum offset of the web feed element perpendicular to the roller axis plane greater than 1/4, particularly preferably greater than 1/2 of the diameter of the first and / or second roller.

In principle, it is conceivable that the displacement device combines a linear guide with a curved guide. In the case of a vertical nip, for example, it is conceivable that one of the displacement devices has a linear guide in the lower region which merges into a curved guide in the upper region. It is also conceivable to connect two curved guides at the end with a linear guide.

The displacement device can have a spindle for displacing the web feed element, which spindle can preferably be actuated by a motor or by hand. The displacement device can comprise a hydraulic and / or pneumatic drive for displacing the web feed element.

The calender has a hand guard which automatically retains its protective effect when the displaceable web feed element is adjusted.

It comprises at least one part which does not change its distance from the material web when the web feed element is displaced.

For this purpose, this at least part of the hand protection is connected to the web feed element and is therefore automatically shifted along with it. When the web feed element is displaced, this makes manual correction of the position of the hand protection, which is not possible or difficult and dangerous during the treatment of the material web, unnecessary.

This hand protection can be used to ensure that personal protection is maintained uninterruptedly when the angle of wrap is adjusted while the material web is being treated, that is, during ongoing production. The hand protection preferably extends in the area of the web feed element above and below the material web to less than 10 mm from the surface of the moving material web. In this way, crushing of a hand or a finger of an operator in the nip is reliably avoided.

The hand protection is preferably composed of a part connected to the web feed element and a part not connected to the web feed element. The part that is not connected to the web feed element is preferably arranged in a stationary manner relative to the frame of the calender. A part connected to the web feed element and a part of the hand guard not connected to the web feed element are preferably arranged so as to overlap each other, preferably in such a way that they overlap in the entire displacement range of the web feed element and reliably prevent reaching through.

A plurality of, for example exactly two, parts of the hand protection connected to the web feed element can be provided. One of these parts is preferably arranged below the web of material running between the web feed element and the nip and the other preferably above. Both or, as preferred, only one of these two parts, preferably the part arranged below the web running between the web feed element and the nip, can overlap with a part of the hand guard that is not connected to the web feed element. This overlapping reliably prevents access from below, for example past the material web, into the inlet area of the calender. The part of the handguard connected to the web feed element, which is arranged above the web running between the web feed element and the nip, is preferably large enough to reliably prevent an operator from reaching over in the lower end position of the web feed element.

Instead of a hand guard, an access barrier can be provided which prevents an operator from accessing the inlet area of the calender located directly in front of the nip in the running direction. In particular in the embodiment with access barrier, a web tension measuring device and a web tension display device can be provided with which the web tension can be determined and displayed immediately in front of the nip. In this way, the main reason for an operator to be in the infeed area during the treatment of the material web can be eliminated. This is because it has been shown that access to the infeed area is often desired by the operator for the reason to control the infeed of the web into the nip, in particular to be able to feel the web tension. If this is measured and displayed, then access to the inlet area is less important. In particular, it is then possible, as is preferred, to block the access to the inlet area at least temporarily. The access barrier is preferably designed such that an operator is prevented from accessing the area of the calender immediately in front of the nip in the running direction when the nip is closed and / or the first and / or second roller is rotating from all sides of the calender. The access barrier can be designed as a fence.

The pulling mechanism can comprise the web tension measuring device. The web feed element is preferably designed in such a way that it does not or only slightly influences the web tension. In this context, “slightly” means that the influence takes place within the permitted tolerance. Thus, only co-rotating rods or rollers, such as deflection and / or spreader rollers, are preferably arranged between the drawing mechanism and the nip, so that the web tension between the drawing mechanism and the nip only changes slightly. In this way, a simpler measurement of the web tension can be achieved compared to a measurement of the web tension on the web feed element, since the measurement of the web tension on the web feed element can be difficult due to the changing web running angle associated with the translational and / or rotary displacement of the web feed element. The traction mechanism preferably comprises a device which influences the web tension and a deflection roller arranged behind this device in the running direction. The web tension measuring device is preferably arranged on this deflection roller. The deflection roller is preferably co-rotating, so it does not influence the web tension or only slightly influences it.

The web tension measuring device can also be arranged on the web feed element and then preferably on a roller of the web feed element.

The web tension measuring device can also be arranged on the displacement device of the web feed element.

The web tension can be measured, for example, by means of a load cell known per se and / or a force measuring ring and / or other elements for measuring the force. In particular, the force acting on the roller on which the web tension is measured due to the web tension can be determined. The radial force acting on the roller due to the web tension preferably causes a change in the bearing force of this roller at both roller ends. This change in the bearing force is preferably measured at least at one end of the roller.

Means can be provided for keeping the web tension constant in front of the nip or for actively regulating the web tension in front of the nip.

The means for keeping constant can include, for example, a so-called pendulum roller, which is set against the tensile stress of the material web by means of a generally pneumatic cylinder with adjustable pressure. As soon as there is a difference between a material web conveyance taking place in the outlet area of the pendulum roller and one in the inlet area of the pendulum roller, the position of the pendulum arm preferably changes so that a length compensation of the material web and thus It is also possible to keep the web tension constant.

The means for actively regulating the web tension can comprise a regulating device which compares the value determined by means of the web tension measuring device with a nominal value and, in the event of a deviation, controls an element influencing the web tension in the sense of reducing the deviation.

• 1 eine Seitenansicht eines ersten Ausführungsbeispiels eines erfindungsgemäßen Kalanders;
• 2 eine Frontalansicht des in 1 gezeigten ersten Ausführungsbeispiels des Kalanders;
• 3 eine Seitenansicht eines zweiten Ausführungsbeispiels eines erfindungsgemäßen Kalanders;
• 4 eine Seitendarstellung eines dritten Ausführungsbeispiels;
• 5 eine Seitendarstellung eines vierten Ausführungsbeispiels;
• 6 eine Seitendarstellung eines fünften Ausführungsbeispiels;
• 7 eine Seitendarstellung eines sechsten Ausführungsbeispiels.

The drawing shows - purely schematically - five exemplary embodiments of the calender according to the invention. Show it:

• 1 a side view of a first embodiment of a calender according to the invention;
• 2 a front view of the in 1 shown first embodiment of the calender;
• 3 a side view of a second embodiment of a calender according to the invention;
• 4th a side view of a third embodiment;
• 5 a side view of a fourth embodiment;
• 6th a side view of a fifth embodiment;
• 7th a side view of a sixth embodiment.

This in 1 The first exemplary embodiment of the calender according to the invention shown and designated as a whole by 100 comprises a first roll 2 with one axis B. and a second roller 3 with one axis C. that are in a rack G are stored and together make a nip 4th form. The calender is used to treat the nip 4th in the direction of travel L. continuous web 1 . The first roller 2 or the second roller 3 is driven. 1 lets the direction of travel L. the web 1 after passing the nip 4th detect. The first roller 2 is thus above the second roller 3 arranged that a roller axis plane W. going through the axis B. the first roller and the axle C. the second roller 3 is stretched, runs vertically. The first roller 2 is therefore also used as the upper nip-forming roller, the second roller 3 referred to as the lower nip-forming roller. The upper nip-forming roller is heated.

The calender 100 comprises a displaceable web feed element 5 , with which the wrap angle α with which the web 1 the first roller 2 or the second roller 3 until entering the nip 4th wraps around, is adjustable. The in 1 illustrated embodiment can be achieved by shifting the web feed element 5 the wrap angle α between 15 ° wrap around the second roller 3 (shown solid) and 90 ° wrap around the first roller 2 (shown in phantom) during the treatment of the web 1 adjusted.

In 2 is the web feed element 5 partially omitted and the second roller 3 shown partially cut. In this way it can be seen that the second roller 3 is designed as a controllable deflection, floating roller.

The web feed element 5 is by means of a displacement device 6th in a first end position 7th and in a second end position 8th relocatable. The web feed element 5 has a longitudinal axis A. on that are parallel to the axes B. , C. the first and second rollers 2 , 3 runs. One through this longitudinal axis A. in the two end positions 7th , 8th Spanned end position level E. is at an angle of inclination β to the roller axis plane W. inclined. The angle of inclination β is about 5 °.

The plane formed by the tangents that are on the first or second roller 2 , 3 at which the wrap angle α is adjustable, parallel to the roller axis plane W. on the entry side of the calender 100 run, is in the context of this publication as a tangential plane T designated.

The web feed element 5 has two web deflectors 24 , 24 ' on, namely a rotating spreader roller 21 and a rotating deflection roller 22nd . The deflection roller 22nd is in the direction of travel L. behind the spreader roller 21 arranged. The web deflection devices have contact surfaces 13th on which the web is in contact.

In the first end position 7th is one of the roller axis plane W. facing area of the contact surface 13th the web deflection device 24 ' of the web feed element 5 , here the deflection roller 22nd , of which the nip 4th remote side of the tangential plane T spaced. In the second end position 8th touches this area of the contact surface 13th the tangent plane T .

The web feed element 5 influences the web tension before the nip 4th in this exemplary embodiment not at all or only slightly. The calender therefore includes a pulling mechanism 15th in the direction of travel in front of the nip 4th , which builds up or sets the required web tension. The train 15th comprises a device influencing the web tension 16 in the form of one of the web of goods 1 wrapped drivable and brakable rubberized roller 23 , as well as a first deflection roller 25th and a second pulley 17th . The train 15th is below the web feed element 5 arranged. The second pulley 17th is in the direction of travel L. behind the rubberized roller 16 arranged and rotating.

The web feed element 5 is by means of the displacement device 6th linearly displaceable, the displacement device 6th includes a linear guide for this purpose 29 . The linear guide 29 is at the same angle of inclination β inclined to the roller axis plane, like the end position plane E. .

It's a kick 28 provided for an operator who is in the direction of travel in front of the nip 4th is arranged. The kick 28 should allow the operator to change the material line if necessary 1 before the nip 4th to be able to touch with the hands in spite of the necessary feeding of the web of material. The kick 28 is designed like a bridge for this purpose; the web 1 is passed under him.

• Das Bahnzuführungselement 5 ist in dem in 3 gezeigten zweiten Ausführungsbeispiel eines Kalanders 200 durch einen drehbaren Drehspanner 19 gebildet, der als dreifach Drehspanner ausgeführt ist. Das Bahnzuführungselement 5 umfasst in dieser Ausführungsform drei Bahnumlenkvorrichtungen 27, 27', 27'', die als feststehende Stäbe 20 ausgeführt sind und die Warenbahnspannung vor dem Nip 4 einstellen. Aus diesem Grund weist dieses Ausführungsbeispiel kein Zugwerk 15 auf, sondern lediglich eine Umlenkwalze 26, die mitdrehend ausgebildet sein kann. Die von der Warenbahn 1 in Laufrichtung zuletzt umlaufene Bahnumlenkvorrichtung 27'' ist geschlitzt ausgebildet; sie weist eine in der Zeichnung nicht dargestellte spiralförmig umlaufende Nut auf, um einen Breitstreckeffekt zu erzielen.

In the 4th to 9 further exemplary embodiments are shown. The same reference symbols denote the same components. In this respect, reference is made to the description above. Only the differences to that in the 1 and 2 shown first embodiment:

• The web feed element 5 is in the in 3 shown second embodiment of a calender 200 by a rotatable rotary clamp 19th formed, which is designed as a triple rotary clamp. The web feed element 5 In this embodiment comprises three web deflection devices 27 , 27 ' , 27 '' that act as fixed rods 20th are executed and the web tension before the nip 4th to adjust. For this reason, this embodiment has no pulling mechanism 15th on, but only a deflection roller 26th , which can be designed to rotate. The one from the web 1 Web deflection device last circulated in the direction of travel 27 '' is slotted; it has a spiral groove, not shown in the drawing, in order to achieve a spreading effect.

The angle β is about 10 °. By moving the web feed element 5 between the end positions 7th , 8th can be the wrap angle α again between 15 ° wrap around the second roller 3 and 90 ° wrap around the first roller 2 during the treatment of the web 1 adjusted.

In the in 4th illustrated third embodiment of a calender 300 is the web feed element 5 by means of the displacement device 6th along an arcuate curved path 10 between the end positions 7th , 8th displaceable and the displacement device 6th includes a circular arc guide 30th . The calender 100 allows in this embodiment the adjustment of the wrap angle α on the first roller 2 up to about 150 ° and one loop around the second roller 3 of about 5 °. The pivot point of the circular arc guide 30th coincides with the axis of rotation B. the first roller 2 together.

To take away one of the main motivations from the operator, go to the entry area 9 of the calender is a web tension measuring device 14th and a material web tension display device (not shown in the figures) is provided, with which the material web tension immediately before the nip 4th can be determined and displayed. The web tension measuring device 14th is on the second deflection roller 17th of the towing gear 15th arranged. As the web feed element 5 does not or only slightly influences the web tension in this exemplary embodiment, the web tension before the nip 4th can be measured at least approximately.

In the 5 and 6th The fourth and fifth exemplary embodiments shown have the calenders 400 , 500 a hand guard 11 on, the parts 12th , 12 ' includes, in the area of the web feed element 5 their distances 18th , 18 ' to the web 1 and in particular also to the deflection roller 22nd when moving the web feed element 5 automatically maintained. Due to the small size, the clearances are 18th , 18 ' not recognizable in the figures and only their positions are shown by arrows. As the 5 and 6th show are the parts 12th , 12 ' with the web feed element 5 connected. One of those parts 12th is above that between the web feed element 5 and the nip 4th running web 1 arranged and the other 12 ' these parts below. Only that below that between the web feed element 5 and the nip 4th running web 1 located part 12 ' overlaps with one with the web feed element 5 not connected part 12 '' of hand protection 11 , which is above the deflection roller 17th on the train 15th is appropriate.

The in 6th fifth embodiment shown 500 are those below that between the web feed element 5 and the nip 4th running web 1 located parts 12 ' , 12 '' of hand protection 11 closer to the roller axis plane W. arranged than the in 5 fourth embodiment shown 400 .

The one with the web feed element also extends 5 connected part 12 ' to close to the deflection roller 22nd on the the part 12th opposite side.

It goes without saying that the parts 12 ' , 12 " are dimensioned so that even in the second end position 8th located web feed element no horizontal gap between the parts 12 ' and 12 " arises. If necessary, the parts can be extended telescopically or further parts can be provided.

Another embodiment of a calender according to the invention 600 is in 7th shown. It is different from the one in 4th illustrated calender 400 in that the spreader roller 21 and the deflection roller 22nd on different cam tracks 10 ' , 10 " equidistant, ie with a constant distance d are displaceable to each other. The cam tracks are designed in such a way that the spreader roller 21 in the first end position 7th in a lower position than the deflection roller 22nd is, whereas the spreader roller is 21 and the deflection roller 22nd in the second end position 8th are at about the same level. With this calender 600 can be the wrap angle α between 10 ° wrap around the second roller 3 and 145 ° wrap around the first roller 2 during the treatment of the web 1 adjusted.

List of reference symbols

100, 200, 300, 400, 500, 600

calender

1

Web

2

first roller

3

second roller

4th

Nip

5

Web feed element

6th

Displacement device

7th

first end position

8th

second end position

9

Inlet area

10, 10 ', 10 "

Curved path

11

Hand protection

12, 12 ', 12' '

Part of the hand protection

13th

Contact surface

14th

Web tension measuring device

15th

Traction

16

Device influencing web tension

17th

second deflection roller of the pulling mechanism

18th

Distance between a part of the hand guard connected to the web feed element and the web of material

19th

Rotary clamp

20th

Bars

21

Spreader roller

22nd

Deflection roller

23

rubberized roller

24, 24 '

Web deflection device

25th

first deflection roller of the pulling mechanism

26th

Deflection roller

27, 27 ', 27' '

Web deflection devices

28

Kick

29

Linear guide

30th

Circular arc guide

A.

Longitudinal axis

B.

Axis of the first roller

C.

Axis of the second roller

E.

End position level

G

frame

L.

Running direction

T

Tangent plane

W.

Roller axis plane

α

Wrap angle

β

Inclination angle

d

distance

Claims (9)

Calender (100, 200, 300, 400, 500, 600) for treating a web (1), with a first roller (2), which has an axis (B), with a second roller (3), which has an axis ( C), the first roll (2) forming a nip (4) with the second roll (3) when the calender (100) is in operation, and the axes (B, C) of these rolls (2, 3) form a roll axis plane ( W) define, and with a displaceable web feed element (5) with which the wrap angle (α) with which the web (1) wraps around the first or second roller (2, 3) until it enters the nip (4) is adjustable, wherein the wrap angle (α) during the treatment of the web (1) can be adjusted to at least 80 °, preferably from 0 to at least 90 °, characterized in that the calender (100) has a hand guard (11) which has a part (12 ) which maintains its distance (18) from the web (1) when the web feed element (5) is displaced. Calender after Claim 1 , characterized in that the web feed element (5) can be displaced into a first end position (7) and into a second end position (8), the web feed element (5) having a longitudinal axis (A) which is parallel to the axes (B, C ) the first and second roller (2, 3) and through this longitudinal axis (A) in the two end positions (7, 8) an end position plane (E) is spanned, which is inclined at an angle of inclination (β) to the roller axis plane (W) , which is preferably greater than 5 ° and less than 60 °. Calender after Claim 1 or 2 , characterized in that the web feed element (5) is linearly displaceable. Calender according to one of the Claims 1 to 3 , characterized in that the path feed element (5) can be displaced along a curved path (10). Calender according to one of the Claims 1 to 4th , characterized in that at least this part (12) of the hand protection (11) is connected to the web feed element (5) and is therefore displaced with it. Calender (100) according to one of the Claims 1 to 5 , characterized in that a web tension measuring device (14) and a web tension display device are provided with which the web tension can be determined and displayed immediately in front of the nip (4). Calender after Claim 6 , characterized in that a pulling mechanism (15) is arranged in front of the web feed element (5) in the running direction (L) and comprises the web tension measuring device (14). Calender after Claim 7 , characterized in that the pulling mechanism (15) comprises a device (16) influencing the web tension and a deflecting roller (17) arranged in the running direction (L) behind this device (16) and the web tension measuring device (14) is arranged on this deflecting roller (17) is. Calender after Claim 6 , characterized in that the web tension measuring device (14) is arranged on the web feed element (5).

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