DE10342210A1 - Method and device for measuring a web tension of a material web and a nip force in a nip - Google Patents

Abstract

The invention relates to a method for measuring a web tension of a material web (14) and / or a nip force in a nip (13) formed by two rolls (11, 12). The object of the invention is to provide a method with which the web tension and / or the nip force can preferably be measured more simply. DOLLAR A In the method according to the invention, the web tension on a winding roller (11) and / or on a carrier drum (12) and / or an air squeegee roller and / or on a spreader roller (15) and / or on a guide roller (16) eienr winding machine ( 10) measured and / or the nip force on the carrier drum (12) and / or on the Luftabquetschwalze.

Description

The The invention relates to a method for measuring a web of a train Material web and / or a nip force in one by two rollers formed nip.

Around to be able to determine the web tension on a winding machine are previously elaborate mathematical calculations required, based on a drive torque support a central drive of a spool and a deflection of the web. Nip forces are at all not or only with the greatest effort to calculate.

In the DE 199 20 133 A1 For example, a method and apparatus for measuring a nip force occurring in the nip between two rotating rolls is described. In this case, the nip force is measured by means of at least one piezo element mounted on at least one of the two rotating rollers. Furthermore, the describes DE 199 20 133 A1 various possible arrangements of the piezo elements on at least one of the two rotating rollers. The different arrangement options and the high measuring accuracy of the piezo elements allow a very accurate measurement of the nip force.

The DE 299 07 798 U1 describes a winding axis with a plurality of independent and arranged along the winding axis expansion zones. In these expansion zones, the diameter of the winding axis can be changed as required. In this way, for example, the winding hardness of a wound material web can be actively influenced in particular.

The Invention has the task of a method of the aforementioned Art to improve that in the future, the train and / or the nip force can preferably be measured more easily. Also should be a zone-wise measurement of the web tension and / or the nip force allows become.

The Invention solves the task posed by a method of the aforementioned Kind, in the invention according to the train on a winding roller and / or on a carrier drum and / or on a Luftabquetschwalze and / or on a spreader roll and / or on a guide roller and / or the nip force on the carrier drum and / or is measured at the Luftabquetschwalze a winding machine. On this way, the web tension and / or the nip force on the Winding machine without complicated mathematical calculations directly determine. If one of the winding roller and / or the carrier drum and / or the Luftabquetschwalze and / or the spreader roll and / or the Guide roll with a measuring device, the at least one of the Prior art has known piezoelectric element for measuring the Railway train and / or Nipkraft equipping, can by the method according to the invention the web tension and / or the nip force along the web width be measured, so that a web tension profile and / or a Nipkraftprofil along the web width receives. It is also possible with the method according to the invention to calculate a mean value of all web tension and nip force values.

advantageously, For example, the web tension can be applied to a spreader roll arranged in front of the carrier drum or guide roll to be measured. Then, for example the speed and / or the torque of the carrier drum are changed, to compensate for too high or too low a train. As a general rule In doing so, the mean value of the corresponding variable is changed.

If at a Tambourwechsel the nip between the carrier drum and the Drum open is, the web tension can also be measured on the carrier drum. In this case, the web tension through the center drive of the spool, through a change the speed and / or the torque of the carrier drum and / or by a change the speed and / or the torque of the Luftabquetschwalze corrected become.

It is also possible to measure the nip force in the closed nip between the spool and the carrier drum. Then can be dispensed with previously known Scherbolzenlösungen to avoid possible damage to the winding machine. On the basis of the measured nip force, the value of the nip force can then be changed. However, it is also possible to increase the diameter of the carrier drum and / or to influence the line force sectionally. For this purpose, the carrier drum with the in the DE 299 07 798 U1 be mentioned along the roller length angeordned expansion zones.

In addition, it is possible to measure a radial stress in the shell of the winding roller. The radial stress in the shell of the winding roller depends on the winding hardness of the wound material web, wherein the winding hardness depends, inter alia, on the web tension. The radial stress is thus, inter alia, a function of the train. So if the radial stress in the shell of the winding roller is measured, it can be concluded that the train. It makes sense on the jacket of the winding roller from the DE 199 20 133 A1 known piezoelectric elements arranged to measure the radial stress. To the radial tension of the Changing the winding roller, the winding roller with the in the DE 299 07 798 U1 be equipped expansion zones so that the empty drum on the diameter can be changed accordingly.

In Another variant of the method, it is also possible the train with open Nip while of the reel change at the Luftabquetschwalze to measure. Then can based on the measured web tension the speed and / or torque the Luftabquetschwalze and / or the carrier drum and / or the spool changed to correct the train.

Further Is it possible the nip force in the nip between the spool and the air squeegee to eat. If the Luftabquetschwalze with the mentioned Ex pansionszonen is provided with a deviation of the nip force of the diameter the Luftabquetschwalze or the local pressure in areas changed become.

If the measurements of the nip force in the nip between the spool and the carrier drum, which are performed with the carrier drum and / or the drum, can show that the nip force is too high or too low Cambering provided on the carrier drum and / or on the drum full nipple ensure a level nip, and thus a uniform nip force.

It also concerns the invention a method for measuring a nip force in a through two rolls formed nip, according to the invention, the nip force on a roll press and / or on a calender and / or on a Coating machine or the like is measured. Then the nip force at standstill and / or during the operation of the roller press and / or the calender and / or the Coating machine to be measured. If the nip force is too big or too is small, the diameter of at least one can make the nip Roller and / or the local pressing in the already mentioned ways changed become. Besides that is it possible too high a nip force due to nip force fluctuations between high and low nip force values to a mean nip force value, the below the excessively high nip force value.

The The invention also relates to a device for carrying out a Method according to one of the claims 1 to 8, according to the invention, the winding roller and / or the carrier drum and / or the Luftabquetschwalze and / or the spreader roll and / or the guide roll with a measuring device for measuring the web tension and / or the winding roller and / or the carrier drum and / or the Luftabquetschwalze with a measuring device for measurement equipped the nip force is.

Further The invention relates to a device for carrying out a A method according to claim 9 or 10, wherein according to the invention at least one of the rollers with a measuring device for measuring the nip force equipped is.

These Measuring devices can advantageously be provided with at least one piezoelectric element, because the piezo elements have a very high measuring accuracy.

following Be exemplary embodiments of Invention explained in more detail with reference to the accompanying drawings.

in the Show individual:

1a a schematic side view of a winding machine with a closed nip;

1b a schematic front view of the winding machine 1a ;

1c a schematic side view of the winding machine 1a with opened nip;

2 a schematic side view of a second embodiment of a winding machine with an open nip;

3 a schematic sectional view through a wound winding roller;

4 a schematic side view of a roller press;

5 a schematic side view of a coating machine;

6 a schematic side view of a calender.

The 1a and 1b show a winding machine 10 with a drum 11 and a carrying drum 12 , The drum 11 and the carrying drum 12 form a closed nip 13 in which a nip force along the width of the material web 14 prevails (see 1b ). The nip force can vary in size along the web width. Thus, a not shown here on the carrier drum 12 arranged measuring device a Nipkraftprofil along the carrier drum 12 measure up. Due to the measured nip force, the mean value of the nip force can be changed if it deviates from a predetermined desired value. Furthermore, it is also possible the diameter of the carrier drum 12 to increase. This can be done by not shown here on the carrier drum 12 envisaged expansion zones ge Schehen.

It is also possible with the carrier drum 12 the train along the material web 14 to eat. In this way one obtains a web tension profile along the web width. If the measured web tension deviates from a setpoint, the speed and / or torque of the carrier drum may vary 12 be changed to compensate for the train. Advantageously, the carrier drum 12 for measuring the web tension and / or the nip force equipped with at least one piezoelectric element not shown here.

Additionally or alternatively, it is also possible that a spreader roller arranged in front of the carrier drum 15 or a guide roll 16 also with a measuring device for measuring the web tension of the web 14 are equipped. Consequently, those through the spreader roll can also 15 and the guide roller 16 determined Bahnzugwerte for a speed and / or torque change of the carrier drum 12 be used.

1c shows the winding machine 10 with an open nip 100 as required by a reel change. With the nip open 100 can the web of material web 14 advantageously by on the carrier drum 12 arranged piezo elements are measured. If the measured web tension deviates from a nominal value, the speed and / or the torque of the carrier drum 12 be changed accordingly.

2 shows another embodiment of a winding machine 20 facing the winding machine 10 with an air squeegee 21 is provided. The squeegee roller 21 presses against a tambour during a reel change 22 if the nip is between a carrier drum 23 and the drum 22 is open. The squeegee roller 21 is also provided with a measuring device for web tension measurement and / or Nipkraftmessung. Advantageously, the measuring device on the Luftabquetschwalze 21 arranged piezo elements on. Thus, also by the Luftabquetschwalze 21 a web tension profile or Nipkraftprofil along the width of the web 14 be measured. If the web tension values deviate from a predetermined target value, the deviations may be due to a change in the rotational speed and / or the torque of the air squeegee roller 21 be compensated. When the nip force values deviate from a given set point and the air squeegee roll 21 equipped with expansion zones arranged along the roll length, the nip force can be changed by means of a change in diameter and / or a change in the local pressure in the expansion zones.

3 shows a winding roller 30 with a core 31 , Through the on the core 31 wound windings are formed in the jacket 32 of the core 31 Radial stresses. The radial stress in the jacket 32 depends on the winding hardness of the wound material web and not shown here, wherein the winding hardness depends inter alia on the web train. The radial stress is thus, inter alia, a function of the train. So if the radial stress in the jacket 32 the winding roller 30 is measured, it can be concluded on the train. If on the coat 32 Piezo elements are arranged, the radial stress can be measured. To change the radial stress, the jacket can 32 be equipped with expansion zones, so that on the empty drum the diameter or the local pressure can be changed accordingly.

4 shows a roller press 40 in which between press rolls 41 and 42 a nip force occurs. If one of the press rolls 41 and 42 is provided with a measuring device, in particular with piezo elements, the nip force along the width of the material web 14 be measured at standstill and during operation.

5 shows a coating machine 50 in which the material web 14 through one of two rollers 51 and 52 formed nip is passed. Also the rollers 51 and 52 can be provided with a piezoelectric measuring device to the nip force between the rollers 51 and 52 along the material web width to measure.

6 shows a calender 60 , the calender rolls 61 having. If at least one of the calender rolls 61 provided with appropriate measuring means, the nip force between at least one of the calender rolls 61 formed nips are measured along the web width.

When the nip force in the roller press 40 , in the coating machine 50 or in the calender 60 is too large or too small and at least one of the nip-forming rollers along the roll length is equipped with expansion zones, the diameter of at least one nip forming roll can be changed to compensate for the nip force along the roll length. In addition, it is possible to reduce too high a nip force due to nip force fluctuations between high and low nip force values to a mean nip force value which is below the excessively high nip force value.

Claims (13)

Method for measuring a web tension of a material web ( 14 ) and / or a nip force in one through two rollers ( 11 . 12 . 21 . 22 ) formed nip ( 13 ), characterized in that the web tension on a winding roller ( 11 . 22 ) and / or on a carrier drum ( 12 ) and / or on an air squeegee ( 21 ) and / or on a spreader roll ( 15 ) and / or on a guide roller ( 16 ) and / or the nip force on the carrier drum ( 12 ) and / or at the Luftabquetschwalze 21 a winding machine ( 10 ) is measured. A method according to claim 1, characterized in that the web tension on a front of the carrier drum ( 12 ) arranged spreader roll ( 15 ) is measured. A method according to claim 1 or 2, characterized in that the web train in an open nip ( 100 ) during a reel change on the carrier drum ( 12 ) is measured. Method according to one of claims 1 to 3, characterized in that the nip force in the nip ( 13 ) between drum ( 11 ) and carrying drum ( 12 ) is measured. Method according to one of claims 1 to 4, characterized in that a radial stress in the jacket ( 32 ) a winding roller ( 30 ) is measured. Method according to one of claims 1 to 5, characterized in that the web draw at an open nip during a Tambourwechsel at the Luftabquetschwalze ( 21 ) is measured. Method according to one of claims 1 to 6, characterized in that the nip force in the nip between the spool ( 22 ) and the Luftabquetschwalze ( 21 ) is measured. Method according to one of claims 1 to 7, characterized in that the nip force in the nip between the drum ( 22 ) and the carrying drum ( 21 ) with the carrier drum ( 21 ) and / or the drum ( 22 ) is measured. Method for measuring a nip force in one by two rolls ( 41 . 42 . 51 . 52 . 61 ) formed nip, characterized in that the nip force on a roll press ( 40 ) and / or on a calender ( 60 ) and / or on a coating machine ( 50 ) or the like is measured. A method according to claim 9, characterized in that the nip force at standstill and / or during operation of the roller press ( 40 ) and / or the calender ( 60 ) and / or the coating machine ( 50 ) is measured. Device for carrying out a method according to one of claims 1 to 8, characterized in that the winding roller ( 11 ) and / or the carrier drum ( 12 ) and / or the Luftabquetschwalze ( 21 ) and / or the spreader roll ( 15 ) and / or the guide roller ( 16 ) with a measuring device for measuring the web tension and / or the winding roller ( 11 ) and / or the carrier drum ( 12 ) and / or the Luftabquetschwalze ( 21 ) is equipped with a measuring device for measuring the nip force. Apparatus for carrying out a method according to claim 9 or 10, characterized in that at least one of the rollers ( 41 . 42 . 51 . 52 . 61 ) is equipped with a measuring device for measuring the nip force. Device according to claim 11 or 12, characterized in that that the measuring device has at least one piezoelectric element.