EP2436625A2 - Method for producing and processing paper - Google Patents

Abstract

The method involves transferring the information determined during the paper manufacturing (HP) to the respective processing process over the paper for optimizing processing process. The processing process is concerned with a winding or formatting process (WP) carried out in an offline-standing double web-winding apparatus (1). The double web-winding apparatus has winding cylinders (2,3,4), with whose influence winding rollers are formed.

Description

The invention relates to a method for the production and further processing of paper, wherein for the optimization of at least one further processing process in paper production determined information about the respective paper is transmitted to the respective further processing process and taken into account in this.

The invention will be explained below in connection with the production and further processing of paper. The term "paper" or the terms "paper web" or simply "web" used in the further description due to the web shape usually present in the production or further processing process should be understood in the broader sense in connection with the present specification, and those by the person skilled in the art In the narrower sense differentiated webs of cardboard, cardboard or tissue with include.

Paper webs are produced in relatively large widths of up to more than 11 m in a paper machine. The production is almost endless. In this case, the machine direction of the paper machine defines the longitudinal direction for all machines and devices located in the paper factory and the transverse direction perpendicular thereto in the horizontal plane. To simplify the present document, the longitudinal direction is further referred to as MD (Main Direction) or X direction, the transverse direction as CD (Cross Direction) or Y direction and the height direction perpendicular to a plane spanned by these two directions Z direction designated.

In the papermaking process, a plurality of characteristic features, usually mechanical and technological features, of the paper, which are important for one or more subsequent further processing processes, are determined. These change more or less strongly during production even within one paper type and across the web width.

These features can be, for example, transverse and longitudinal profiles, fiber distributions, density, smoothness, moisture content, shrinkage behavior, roughness and friction values, resulting weakenings or cracking, and much more.

The respective further processing process can be, for example, a refining process, such as calendering, a coating or coating process, or a winding process. In addition to these, usually in a local environment of the manufacturing process, usually within a paper mill, further processing processes may take place but also be a printing process, which usually takes place only at a customer of the paper manufacturer.

At the end of the paper machine, however, the paper web produced is first wound in full width onto a winding core. This winding core is replaced cyclically, usually during production. The resulting web-width winding roll is commonly referred to as mother roll or full tambour.

The aforementioned position-related information about the web properties are thus not available to the subsequent processing processes.

Because the bar codes commonly used to identify a special parent role contain only very general information, such as date of manufacture and some target data.

In order to be manageable for a later user, for example a printing company, the paper web wound on a mother roll has to be cut into several parallel partial webs whose widths are suitable for the respective later user. These widths can vary greatly from case to case, so that the division of the paper web is usually made according to an individually definable pattern. The partial webs are then wound into winding rolls, which are called Teilbahn- or finished rolling and are issued together as a so-called roll throw. The pattern can be changed from roll throw to roll throw. The slitting and winding is conveniently carried out in a single machine, which is then often referred to as a slitter.

All of the winding devices described above, ie those for the production of parent rolls as well as those for the production of partial web or finished rolls, has in common that the train to be wound up to form a winding roll forms a winding nip with at least one winding roller on which it is supported or on it on or rests and which is accordingly referred to as a support or support roller. These winding rollers, which are in direct contact with the forming winding rollers, thus also constitute the directly acting tools by means of which the winding quality can be influenced. The understanding of winding quality is determined from the perspective of the customer and today defined by numerous objective and subjective parameters. Simply speaking, the paper webs unwound from the finished rolls should be able to be processed without interruption and good printing results to be achieved.

For this purpose, in particular a trouble-free run in the unwinding of the printing machine is necessary, which requires a central winding roll structure, a symmetrical sleeve seat and a favorable winding hardness profile in the winding roll.

Furthermore, the individual winding roll should be free of winding defects, in particular free of crevices, places, bars (which are also known as washboard pattern or rope markings), star formation, lateral positional shifts and markings on the material web surface.

To achieve these goals, a variety of facilities and provisions related to the design of reel winders are known.

Based on the paper parameters on the winding process influencing basic parameters such as basis weight, density, compressibility, friction coefficients, smoothness, moisture content and CD and MD profiles are the expert machine on the machine side to influence the winding roll formation essentially the choice of winding principle, driving data such as web tension and Speed and different vibration damping methods available.

It is disadvantageous that all measures hitherto known from the prior art have taken place exclusively by inference from the conditions observed directly within a winding and / or formatting process following the actual production process.

The invention is therefore based on the object of further developing a method for producing and further processing paper in such a way that the winding structure is improved and, in particular, the conditions in the winding area are stabilized.

This object is achieved according to the invention in that the further processing process is a winding and / or formatting process carried out in an offline double-takeup roll winding device, the double take-up roll winding device having winding rolls under the influence of which winding rolls are formed.

In this way, the winding process can be adapted to the expected conditions and can be customized to a large extent with regard to the different design of the finite material web sections to be processed.

It is particularly advantageous if the information is transmitted via a data network to the Doppeltragwalzenwickelvorrichtung. Of course, this sounds out of the ordinary view of a person skilled in the art because a reel winder always has a completely different control system than a papermaking machine. The expected linkage effort is considerable and the associated disruption potential considerably.

However, it has surprisingly been found in experiments that the number of avoidable disturbances in this way is greater than the number of errors resulting from the data network linkage.

Advantageously, it is ensured that information is also determined within the Doppeltragwalzenwickelvorrichtung and the information weighted or unweighted influence on the winding and / or formatting process.

This then provides data as the basis for a truly comprehensive assessment option.

It is also preferred that the information determined within the Doppeltragwalzenwickelvorrichtung are transmitted to a paper machine and are taken into account in at least one process step of papermaking before the winding and / or formatting process.

In this way, the production process of the paper web, in certain limits, to the, in particular currently available, processing options of Doppeltragwalzenwickelvorrichtung customizable. Under current circumstances, of course, in this context is not a time exact match, as it is preferred in the transmission of data understood. Among the current processing options in this context, rather, the performance of Doppeltragwalzenwickelvorrichtung under the real existing environmental parameters, such as ambient climate, currently to be processed paper web, momentary wear, such as or the winding coverings of a support roller u.v.m. Understood.

With great advantage, the information obtained is used to prevent or reduce vibrations occurring.

In this way, the method according to the invention can be used particularly effectively, since occurring oscillations in today's winding processes usually represent the main cause of winding defects.

In contrast to the prior art, a predictive control / regulation of the vibration hazards counteracting devices of Doppeltragwalzenwickelvorrichtung can be achieved in this way.

It is advantageous if the ascertained information, in particular with regard to the local distribution of detected parameters of at least one kind, in particular with regard to a periodic recurrence laid down via a winding scheme, is examined and / or processed and / or evaluated.

In this way, in the Doppeltragwalzenwickelvorrichtung existing devices are particularly targeted use. Periodic repeating parameters are a particularly dangerous source of vibration initiation.

It is of particular advantage if the information obtained is evaluated with regard to expected complications in the winding process, with influence and effect relationships of different parameters being included with particular advantage in the evaluation.

It is conceivable that the information with respect to a single feature stronger influence on the control of the

Double take-up winder takes as a group of other detected features. The decisive factor is the strongest influence on the winding process. It is conceivable that the control / regulating unit is configured self-learning.

Preferably, the determined information is used to control a passive damping device or repayment device.

For example, the friction cross-section of a damping device, the viscosity of an electrorheological oil of a damping unit or the effective lever arm of the mass of an absorber mass in real time or almost be varied in real time. This always ideal damping efficiencies can be achieved.

It may also be preferred that the determined information be used to control an active damping device or repayment device.

An impulse of such a device is then always in an ideal manner of just needed pulses for superimposing unwanted vibration states controlled by coordinated excitation.

With great advantage, the information determined for controlling the shape and / or position of at least one winding roller involved in the winding process is used.

It is particularly advantageous if at least one winding roller is formed as, in particular from segments pressure roller and the information determined to a shift and / or to a dosage of pressurization, generation or change in magnitude of a line force in the direction of a developing between the winding roll and the respective winding roller or the respective segment forming winding nip are taken into account.

In this way, the roll growth of the individual next to each other in the winding bed of Doppeltragwalzenwickelvorrichtung forming Teilbahnbeziehungsweise finished rolls is gleichmäßbar. Thus, relative movements of the forming Teilbahn- or finished rolls are effectively prevented or at least significantly reduced. Thus stabilize the conditions in the winding system considerably and there are teilbahnbeziehungsweise finished rolls of high quality produced.

It is also preferred that the determined information for controlling a winding hardness curve be taken into account.

Since even the winding hardness profile already preserved in the winding roll has an immediate effect on the winding defects which are reflected on the surface or in the upper winding layers of a still developing winding roll, it is of great advantage if the course of the winding hardness of an individual winding roll meets the expected properties the paper webs to be wound is customizable.

Likewise, it may be preferred that the determined information for controlling an acceleration and / or velocity course be taken into account.

For example, web breaks can be avoided or reduced in number.

It is particularly advantageous if the determined information relates to a finite section of a paper web wound on a spool and taken into account in the definition of a pattern to be selected for formatting within a single formatting process with regard to production that is as error-free as possible and / or error-free become.

Thus, the overall effectiveness of a Doppeltragwalzenwickelvorrichtung over a medium period, for example, a daily or weekly production can be significantly increased.

With very particular advantage, as determined in the paper production information about the respective paper mechanical and / or technological properties transmitted to the further processing and taken into account in this.

It is of very particular advantage if, as information determined in papermaking about the respective paper, information about the paper constituents or the paper composition is transmitted to the further processing process and taken into account therein,
and or
information about at least one property and / or composition longitudinal profile, which has been determined during papermaking, is transmitted to the further processing process and taken into account therein;
and or
in that information about at least one property and / or compositional cross-profile, determined in papermaking, is transmitted to the further processing process and taken into account therein;
and or
that information about at least one longitudinal and at least one transverse profile of the paper web relating to data relating to the paper web determined during the paper production is transmitted to the further processing process and taken into account therein;
and or
that position-related shrinkage values are taken into account.

This allows winding reels to be individually tailored to the exact quality requirements and their priorities. Thus, it is possible for the user of a method according to the invention, for example the operator of a Doppeltragwalzenwickelvorrichtung equipped for a method according to the invention to deliver the customer always economically manufactured products, in particular bobbins, to its highest satisfaction.

The single FIGURE shows a Doppeltragwalzenwickelvorrichtung in a winding and formatting process WP as a successor process NP of a divided into individual process steps PS but continuously operating Papeierherstellungsprozess is feasible. Wrapping rollers 15 are formed in the winding bed formed by two winding rollers formed as carrier rollers 2, 3. In addition, in the course of the winding and formatting process WP growing bobbins 15 takes a divided into segments 5 Andruckwalze 4 influence. The position and the pressurization F of the segments 5 can be influenced via a control / regulation unit 11 of the double carrier roller winding device 1. This receives from a plurality of different sensors 10 detected information I from the control / regulation unit 12 of the paper machine 14. Both control / regulation units are connected via a data network 13.

Furthermore, the pressure roller 4 is provided in the illustrated embodiment with an active eradicator 7und one of the two support rollers 2,3 with a likewise active damping device 6. These devices can also be influenced under the influence of the transmitted information (I).

Finally, the transmitted information (I), depending on the sensors (9) detected by the sensors 9 provided here in the Doppeltragwalzenwickelvorrichtung also influence the driving data of Doppeltragwalzenvorrichtung, so for example their speed, acceleration and load curves or these generating facilities.

LIST OF REFERENCE NUMBERS

1

Two-drum winder

2

Winding roller, carrier roll

3

Winding roller, carrier roll

4

Winding roller, pressure roller

5

Segment of the pressure roller

6

attenuator

7

repayment facility

8th

winding gap

9

drummer

10

sensor

11

Control unit

12

Control unit

13

Data network

14

paper machine

15

reel

F

print

I

information

M

paper web

P

parameter

S

vibration

HP

Manufacturing process

PS

process step

NP

Postprocessing process (follow-up process)

WP

Winding and / or formatting process

Claims (15)

Method for producing and further processing paper (M), wherein information (I) determined by the paper (M) for the optimization of at least one further processing process (NP) is transmitted to the respective further processing process (NP) via the respective paper (M) be taken into account
characterized,
in that the further processing process (NP) is a winding and / or formatting process (WP) carried out in an offline double winder winding apparatus (1), the double winder winding apparatus (1) having winding rolls (2, 3, 4), among which Influence winding rollers (15) are formed. Method according to claim 1,
characterized,
that information (I) within the Doppeltragwalzenwickelvorrichtung (1) are further determined and the information (I) weighted or unweighted on the winding and / or formatting process (WP) influence. Method according to claim 1 or 2,
characterized,
in that the information (I) ascertained within the double carrier roll winding device (1) is transmitted to a paper machine (14) and taken into account in at least one process step (PS) of the paper production (HP) before the winding and / or formatting process (WP). Method according to one of the preceding claims,
characterized,
that the determined information (I) is used to avoid or reduce vibrations that occur (S). Method according to one of the preceding claims,
characterized,
that the determined information (I), in particular with regard to the local distribution of detected parameters (P), in particular with regard to a periodic recurrence, are investigated. Method according to one of the preceding claims,
characterized,
that the information obtained (I), be assessed in terms of complications, with particular advantage influencing and causal relationships of different parameters (P) are included in the evaluation. Method according to one of the preceding claims,
characterized,
in that the determined information (I) is used to control a passive damping device (6) or eradication device (7). Method according to one of the preceding claims,
characterized,
that the information obtained (I) to control an active Damping device (6) or eradication device (7) are used. Method according to one of the preceding claims,
characterized,
in that the determined information (I) is used to control the shape and / or position of at least one winding roller (2, 3, 4) involved in the winding process (WP). Method according to one of the preceding claims,
characterized,
in that at least one winding roller (2, 3, 4) is designed as a pressure roller (5), which consists in particular of segments (5), and the determined information (I) results in a displacement and / or a metering of a pressurization (F) in the direction a winding gap (8) are taken into account. Method according to one of the preceding claims,
characterized,
that the determined information (I) for controlling a winding hardness curve are taken into account. Method according to one of the preceding claims,
characterized,
that the determined information (I) for controlling an acceleration and / or speed course are taken into account. Method according to claim 10,
characterized,
in that the information (I) obtained relates to a finite section of a paper web (M) wound on a spool (9) and in the definition of a pattern to be selected for formatting within a single formatting process (WP), with as little disturbance as possible / or error-free production. Method according to claim 10 or 12,
characterized,
that information (I) ascertained in the paper production (HP) via the respective paper (M) is transmitted to the further processing process in mechanical and / or technological properties. Method according to one of the preceding claims,
characterized,
that information (I) about the respective paper (M) obtained as information obtained during papermaking is transmitted to the further processing process (NP, WP) via the paper constituents or the paper composition (I), and taken into account therein;
and or
in that information (I) about the respective paper (M) which has been determined during papermaking is transmitted to the further processing process via at least one property and / or composition longitudinal profile and taken into account therein;
and or
in that, as information determined in papermaking (I), information about at least one property and / or compositional cross-profile is transmitted to the further processing process via the respective paper (I), and taken into account therein;
and or
information about at least one longitudinal and at least one transverse profile of data relating to the paper web is transmitted to the further processing process as information determined in papermaking (I) via the respective paper (), and taken into account therein;
and or
that position-related shrinkage values are taken into account.

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