Method for conveying a thread strand, method for synchronising a thread strand with a paper web, method for synchronising a thread with a paper web, device for carrying out the methods

Abstract

The invention relates to a method for conveying a thread strand, a method for synchronising a thread strand with a paper web (100) to be produced in a paper machine, a further method for synchronising a thread (10) with a paper web (100) to be produced in a paper machine, and in each case a device for carrying out the methods.

Description

[0001] >

[0002] Method for conveying a thread strand, method for synchronizing a thread strand with a paper web, method for synchronizing a thread with a paper web, device for carrying out the method

[0003] The invention relates to a method for conveying a thread strand, a method for synchronizing a thread strand with a paper web to be produced in a paper machine, a further method for synchronizing a thread with a paper web to be produced in a paper machine, and a device for carrying out the methods.

[0004] Methods for conveying a thread strand and connecting it to a paper web are known in the art. In practice, a thread strand is applied to the surface of a paper web, with the paper web already present as a finished paper web, and the thread is connected to a surface of the paper web in precise register. Embedding a thread into the volume of a paper web is performed during paper production from paper pulp. This process is relatively complex and laborious.

[0005] The invention is based on the object of eliminating the disadvantages of the prior art. In particular, it is intended to provide methods and devices for carrying out the methods that allow for improved embedding of a security thread in a paper web with precise registration to window openings.

[0006] According to the invention, this object is achieved by a method according to the subject matter of claim 1, by a method according to the subject matter of claim 6, by a method according to the subject matter of claim 11, by a device according to the subject matter of claim 20, by a device according to the subject matter of claim 21 and by a device according to the subject matter of claim 22. One advantage here is that the register-accurate embedding of the thread in the paper web takes place while the paper slurry or paper pulp is still liquid on the paper screen. The liquid paper slurry or paper pulp can enclose the thread on the paper screen, so that subsequent embedding of the thread is not necessary.

[0007] Advantageous embodiments of the invention are specified in the dependent claims.

[0008] According to the invention, a method for conveying a thread strand, in particular an endless thread strand, is claimed. At least one moving first thread and one second thread are connected to produce the thread strand. An end section of the first thread entrains a starting section of the second thread.

[0009] The first and second threads each have a repeatedly repeated sequence of features, wherein the two threads are arranged in register with one another. The method comprises the following steps, in particular in the following order: a) Detecting the register position of at least the first thread by means of a sensor, preferably by means of a first sensor. b) Bringing the second thread, which is held, in particular held or braked, by a holding device into contact with the first thread. c) Generating a control signal for releasing the holding device on the basis of the register position of at least the first thread detected by means of the sensor, preferably by means of the first sensor, such that the register position of the first thread and the register position of the second thread are brought into precise positional agreement when the second thread is carried along by the first thread.

[0010] The thread strand is preferably fed continuously to a paper screen. A slurry made from paper pulp or paper slurry is applied to the paper screen or is applied continuously to the paper screen. The paper web is created by drying or hardening the paper pulp or paper slurry. In particular, the drying already takes place, at least in part, on the paper screen. Preferably, the thread strand is conveyed to the paper screen, on which the paper web is formed from the liquid paper slurry or paper pulp. The thread can either be applied to the paper screen, on which the paper pulp is deposited as a paper web, or the thread can be inserted, in particular on the paper screen, between at least two partial paper webs. The paper slurry or paper pulp can at least partially enclose the thread strand, in particular in such a way that the thread strand is arranged within the paper web to be produced.

[0011] The registration position of at least the first thread is preferably detected by a sensor, preferably by a first sensor, continuously and in particular throughout the entire process of integrating the thread into the paper substrate. The second thread is preferably arranged parallel to the first thread in a region in front of or upstream of the paper screen. In this case, a partial overlap with the first thread can occur on the top side or on the bottom side.

[0012] The control signal preferably synchronizes the movement between the second and first threads. One advantage of this is that it enables a register-accurate change from the first thread to the second thread during ongoing operation. This allows a new thread to be inserted and fed to the paper screen when the first thread runs out during ongoing operation without interrupting production and without losing register accuracy.

[0013] Before step c), the second thread is preferably held with a known position of the features along the longitudinal extent of the second thread, preferably held at rest, while the first thread is conveyed at a specific speed. In particular, the known position is stationary. Preferably, the first conveyed thread already exerts a tensile force on the second thread when the second thread comes into contact with the first thread. The hold of the second thread can be deactivated via the control signal, so that the second thread is carried along by the first thread. By precisely determining the control signal, the register accuracy between the first thread and the second thread can be maintained. A change of the thread during operation while maintaining the register accuracy between the first thread and the second thread is thus possible.

[0014] For the purposes of this patent application, the term "thread" refers to a continuous, flat substrate web, particularly made of a plastic, that can be integrated into a paper web. This substrate web is referred to as a thread, a tape, a ribbon, or a strip. The width of the substrate web can be 1 mm to 25 mm, preferably 2 mm to 15 mm, particularly preferably 3 mm to 10 mm.

[0015] The thread can have a PET carrier. In this case, it is referred to as a half-thread. Alternatively, the thread can have two PET carriers. In this case, it is referred to as a full thread. A half-thread, i.e., a thread with a PET carrier, is preferably used. It is also possible for the thread to have one or more cellulose-based carriers. The carrier can alternatively or additionally contain components, individually or in combination, selected from the following materials: cellulose, cotton, wood, plastic, plant fibers, mottled fibers, dyes, and pigments.

[0016] By introducing the thread into the paper mash or paper pulp, the thread can be embedded in the paper web at least in part and / or be enclosed by the paper web at least in part.

[0017] The thread preferably extends continuously across the entire width or length of the paper web. In particular, the thread is not limited to just one window.

[0018] In particular, the thickness of the thread is small compared to its width.

[0019] A thread strand is an arrangement of two or more threads joined together. This means that if a thread is joined at the end of its length to a new thread, which then takes over the functions of the first thread, this is called a thread strand.

[0020] A window is a recess in the surface of the paper, typically created during papermaking. A window is completely enclosed by paper. Windows are typically used to make the thread visible from one or both sides; that is, the thread is embedded so that it passes through the windows.

[0021] In particular, a sequence of features is understood to mean a sequence of optically readable features and / or sensor-readable features and / or machine-readable features applied along the thread. These features can be designed as, or include, patterns and / or registration marks and / or control marks and / or position markings.

[0022] A repeat is the distance at which a pattern repeats. The repeat length of the thread is the length of an area on the thread until the directly adjacent area begins. An area can comprise a design area and control marks or registration marks. A design area is preferably an optically, sensorily or machine-readable pattern, for example lettering and / or a hologram and / or a particularly partial metallization and / or a colored decoration. The repeat length therefore extends in the running direction of the thread between the outer boundaries of an area. The repeat length of the thread is, in particular after introduction into the paper substrate, as long as a repeat length within the paper substrate or within the paper web is long in the feed direction of the paper substrate or paper web.

[0023] With this solution it is particularly preferred (see also below) if the splicing, ie the addition of a new thread roll to the end of the currently running thread roll, takes place in the register or “near the register”.

[0024] In the context of this patent application, the term "register" is understood in particular to mean the positional accuracy of two or more elements and / or layers relative to one another. Alternatively, the terms "registration" or "register accuracy" or "registration retention" or "registration accuracy" or "positional accuracy" can be used. The register accuracy should preferably be within a specified tolerance and preferably be as high as possible. At the same time, the register accuracy of several elements and / or layers relative to one another is a particularly important feature for increasing process reliability. Accurate positioning is achieved in particular by means of sensor-based, preferably optically detectable, fiducial marks or control marks or position markings.In particular, these registration marks or control marks or position markings either represent special separate elements or areas or layers or are themselves part of the elements or areas or layers to be positioned.

[0025] In particular, if “thread and paper web or two threads are in register with each other”, this means, including tolerances, “as close as possible” to the exact positional accuracy of the thread to the paper web or “as close as possible” to the exact positional accuracy of both threads relative to each other.

[0026] It is also possible for the process steps and substeps to be performed once or multiple times. In particular, process steps and substeps can be repeated. The preferred sequence of process steps comprises at least the order of step a) - step b) - step c), whereby, in particular, further steps or substeps can be inserted between these steps.

[0027] Using the method according to the invention, the thread can advantageously be embedded in the paper web in precise register with windows provided in the paper web, wherein the thread is already introduced into the paper web that is being formed. The thread can either be applied to the paper screen, on which the paper pulp is deposited as a paper web, or the thread can be inserted, in particular on the paper screen, between at least two partial paper webs. This has the advantage that the thread can be enclosed by the paper, at least in some areas, while a solid paper web is formed from the paper pulp and / or from the at least two partial paper webs. This means that the production of the paper web itself and the embedding of the thread take place simultaneously and the thread is thus integrated into the paper web in precise register. The thread can therefore become an integral part of the paper web orof the paper substrate, which is positioned precisely relative to the window openings in the paper. Subsequent manipulation or replacement of the thread in the paper substrate is thus made more difficult, especially because it is difficult to reinsert the thread into the paper in a precisely registered or precisely positioned manner.

[0028] Further advantageous embodiments of the invention are described in the subclaims.

[0029] According to an advantageous embodiment of the invention, the method comprises the following additional step. This additional step is preferably performed after step c): d) Cutting the first thread.

[0030] Advantageously, this allows the remainder of the first thread to be removed early during operation.

[0031] Alternatively, the first thread can be left running empty.

[0032] According to a further advantageous embodiment of the invention, the second

[0033] Thread initially, preferably with a known position of the features along the longitudinal extent of the second thread, and is only set in motion due to the entrainment by the first thread after the release of the holding device in step c).

[0034] In particular, this enables precise synchronization of the features between the two threads without having to interrupt or slow down the conveying process.

[0035] Preferably, the second thread is held in a known register position in the holding device before the release in step c).

[0036] In the event that the second thread is braked by the holding device but not held stationary, the register position of the second thread can preferably be detected by a sensor. In this case, the register position of the first thread and / or the register position of the second thread can be detected by the sensor, preferably by the first sensor. Alternatively or additionally, the register position of the second thread can be detected by a further thread sensor. The control signal for releasing the holding device is preferably generated on the basis of the register positions detected by the sensor, preferably by the first sensor, for the register position of the first thread and / or for the register position of the second thread and / or by the further thread sensor for the register position of the second thread.

[0037] The advantage is that the position of the register is detected by the sensor and any position tolerances can therefore be corrected.

[0038] In a preferred embodiment, two sensors are provided for detecting the register position, preferably for detecting the register marks, of the first thread. The sensor, preferably the first sensor, is preferably arranged downstream of the holding device, and a further sensor, preferably a fifth sensor, is preferably arranged upstream of the holding device. The further sensor, preferably the fifth sensor, thus preferably additionally records the register position in the unwinding first thread. This can additionally assist splicing, i.e., the attachment of the second thread to the end of the first thread near the register.

[0039] According to a further advantageous embodiment of the invention, a bonding medium is applied to the first and / or second thread before, during, or after bringing the second thread into contact with the first thread. The second thread is entrained by the first thread through adhesion of the second thread to the first thread, caused by the bonding medium. The bonding medium is preferably a liquid. Water is particularly preferred as the bonding medium.

[0040] The connecting medium can serve to connect the first thread to the second thread, in particular by adhesion. The liquid connecting medium creates an adhesion layer between the two threads. In particular, the length and / or thickness of the adhesion layer are dimensioned such that the adhesion forces are sufficient to entrain the initially stationary second thread with the moving or conveyed first thread. The start of the entrainment of the second thread can be controlled via the synchronization signal.

[0041] According to the invention, a method for synchronizing a thread strand with a paper web to be produced in a paper machine is also claimed. The paper web comprises a repeatedly repeated sequence of first features. The first features can be design features and / or security features and / or windows and / or functional features, such as register marks. The thread strand has at least one leader thread and one original thread. The original thread comprises a repeatedly repeated sequence of second features. The second features can be design features and / or security features and / or functional features, such as register marks.

[0042] The leader thread, on the other hand, in particular does not include any security features. The leader thread preferably has a maximum width of 5 mm. It is preferred that the leader thread has the same width as the original thread. The width of the original thread and the leader thread can preferably be 1 mm to 25 mm, particularly preferably 2 mm to 15 mm, and further preferably 3 mm to 10 mm. The leader thread can have a PET carrier.

[0043] Alternatively, the leader thread can comprise at least one carrier, which is based in particular on cellulose. The at least one carrier of the leader thread can alternatively or additionally contain components, individually or in combination, selected from the following materials: cellulose, cellulose fibers, cotton, cotton fibers, wood fibers, plastic, plastic fibers, plant fibers, mottled fibers, dyes, and pigments. A leader thread formed in this way can easily be further processed together with the rejected paper web in a paper recycling process without causing a disruptive high proportion of foreign matter that would have to be sorted out.

[0044] In particular, a second repeat length of the original thread is shorter than a first repeat length of the paper web. The second repeat length of the original thread is preferably 0.1% to 10%, more preferably 0.1% to 5%, more preferably 0.2% to 3%, and particularly preferably 0.3% to 1% shorter than a first repeat length of the paper web. For example, the second repeat length of the original thread is 2% shorter than a first repeat length of the paper web. The length factor is calculated from the stated percentage values ​​by subtracting these percentage values ​​from the number 1. In the stated example of 2%, this results in a length factor of 0.98. The length factor can also be referred to as an elongation reserve.

[0045] The method comprises the following steps, in particular in the following order: a) Applying a pulp to a paper screen to produce the paper web. b) Introducing and / or shooting the leader thread into the pulp applied to the paper screen so that the leader thread is connected to the paper web after at least partial drying of the pulp, wherein the paper web and / or pulp at least partially encloses the leader thread. c) After the leader thread has been conveyed from the paper web: bringing the original thread, which is held, in particular held or braked, by a holding device into contact with the leader thread. d) Detecting the register position of the paper web.e) generating a control signal for releasing the holding device on the basis of the detected register position of the paper web, so that the original thread is carried along by the leader thread in such a way that the register position of the original thread and the register position of the paper web are brought into line, wherein the original thread is connected to the paper web after at least partial drying of the pulp, wherein the paper web at least partially encloses the original thread, and f) cutting the leader thread.

[0046] In step e), the original thread is preferably stretched such that the second repeat length corresponds to the stretch of the first repeat length. Additionally, the original thread is released from the holding device such that the register position of the original thread and the register position of the paper web are aligned.

[0047] In particular, the thread is conveyed by applying the thread to the paper screen, on which the liquid paper pulp is deposited as a paper web, or by inserting the thread, particularly on the paper screen, between at least two partial paper webs. The paper pulp or paper slurry or the at least two partial paper webs is / are dried, becoming increasingly solid in the process, and the solid or dried paper pulp or paper slurry or the at least two partial paper webs takes / takes the thread with it.

[0048] The paper screen is advantageously designed as a cylinder, with the circumference of the cylinder being dimensioned such that the paper pulp or paper slurry already becomes sufficiently solid on the paper screen through at least partial drying to entrain the thread. The paper web can be removed from the paper screen together with the precisely embedded thread and processed further.

[0049] In particular, the paper screen has elevations and / or depressions to form windows in the paper web that define the register position for the thread. The elevations and / or depressions of the paper screen are dimensioned in such a way that they are not covered by the paper pulp or paper slurry.

[0050] The original thread is preferably held in a known position (“in register”) before step e).

[0051] It is also possible for the method steps and substeps to be performed once or multiple times. In particular, method steps and substeps can be repeated. The preferred sequence of method steps comprises at least a sequence of step a) - step b) - step c) - step d) - step e) - step f), whereby, in particular, further steps or substeps can be inserted between these steps.

[0052] By means of the method according to the invention, the thread can advantageously be embedded in the paper web in precise register with windows or other elements provided in the paper web. The thread is thereby introduced into the paper web that is already being formed. The thread can either be applied to the paper screen, on which the paper pulp is deposited as a paper web, or the thread can be inserted, in particular on the paper screen, between at least two partial paper webs. This has the advantage that the thread can be enclosed by the paper, at least in some regions, while a solid paper web is formed from the paper pulp and / or from the at least two partial paper webs. This means that the production of the paper web itself and the embedding of the thread take place simultaneously and the thread is thus integrated into the paper web in precise register and thus also becomes an integral part of the paper web.of the paper substrate, which is arranged in particular with precise positioning relative to the window openings in the paper. Subsequent manipulation or even subsequent replacement of the thread in the paper substrate is made more difficult because it is particularly difficult to reinsert the thread into the paper with precise registration or positioning. Without appropriately registered splicing, i.e. joining a moving first thread with a second thread, the registered insertion of the thread into the paper web or into the paper substrate would be lost with each thread roll change and would have to be completely re-adjusted. This would result in a high level of waste from paper substrate with an incorrectly positioned embedded thread.This waste is particularly relevant today because reducing waste is becoming ever more important for economic reasons and many central banks also demand precise accounting of how many security elements and quantities of security paper must be destroyed as waste and how much is retained as a usable substrate for security documents, particularly banknotes. To further reduce waste, it is particularly preferable to use a lead-in material for the initial gripping of the thread in the paper pulp or on the paper screen. This lead-in material is usually available as a separate roll material. In this case, the lead-in material is referred to as a leader thread. Alternatively or additionally, the actual thread can contain the lead-in material in a leader area. By using a leader thread, no original thread is used during device setup.This results in the advantage that fewer rejects are generated due to threads that are not integrated in register with the paper when using original threads. The use of original threads is often subject to mandatory documentation, so its use in rejects should be avoided. Furthermore, original threads are more complex to produce and therefore more expensive than leader threads.

[0053] When inserting threads into a paper substrate, it is generally important to ensure the correct position of the thread relative to the paper substrate. It is particularly important that the front and back of the thread are positioned as desired relative to the paper substrate when the thread is embedded in the paper substrate. If the position is incorrect, the thread must be turned to the correct side as it is fed into the paper substrate, i.e., the position of the front and back of the thread relative to the paper substrate must be changed. This change in the position of the thread with respect to its front and back can also be achieved more economically with a leader thread than with an original thread, and with the other aforementioned advantages regarding documentation requirements and avoiding paper substrate waste.

[0054] The position of the thread with respect to the front and back of the thread relative to the paper substrate can be achieved with a leader thread as an alternative or in addition to the precise registration of the thread relative to the paper substrate. This means that the leader thread can be used, as previously mentioned, to achieve precise registration of the thread relative to the paper substrate and / or the leader thread can be used to achieve correct positional insertion of the thread with respect to its front and back relative to the paper substrate.

[0055] Further advantageous embodiments of the invention are described in the subclaims.

[0056] According to an advantageous embodiment of the invention, the register position of the paper web is detected after step d) by means of a second sensor detecting the paper screen and / or by means of a third sensor detecting the resulting paper web and / or by means of a rotary encoder of the paper screen and / or by means of a rotary encoder of the paper screen drive.

[0057] The third sensor, which detects the resulting paper web, is arranged before or after drying. The third sensor, which detects the resulting paper web, preferably detects the sequence of features of the paper web. According to a further advantageous embodiment of the invention, the desired register position of the original thread is detected by means of a further sensor on the paper screen. The control signal for releasing the holding device is preferably generated based on the detected register position of the paper web or the paper screen.

[0058] According to a further advantageous embodiment of the invention, the leader thread has functional features, in particular in the form of register marks. During gripping of the leader thread, and / or before gripping of the leader thread, and / or after gripping of the leader thread in the paper pulp, these register marks can be detected by means of a sensor, preferably by means of the first sensor, and converted into sensor signals, wherein these sensor signals can be used to set a register, i.e. a positional accuracy between the leader thread and the paper web. This has the advantage that not only during the initial injection of the thread into the paper pulp, but also during the initial adjustment of a register between the thread and the paper web, it is not the original thread with security features that is consumed, but rather the leader thread, which results in less security-sensitive waste.If the original thread is then connected to the leader thread, a register is already established between the paper web and the thread. The functional features of the leader thread, especially the register marks, can also be used to sensor-detect the front and / or back of the thread and thus its position.

[0059] According to a further advantageous embodiment of the invention, a bonding medium is applied to the leader thread and / or the original thread before, during, or after bringing the original thread into contact with the leader thread. The original thread is entrained by the leader thread through adhesion of the original thread to the leader thread, which is caused by the bonding medium. The bonding medium is preferably a liquid. Water is particularly preferred as the bonding medium.

[0060] The connecting medium can be used to connect the first thread to the second thread, in particular by adhesion. The liquid connecting medium creates an adhesion layer between the two threads. In particular, the length of the adhesion layer is dimensioned such that the adhesion forces are sufficient to entrain the initially stationary second thread along with the moving or conveyed first thread. The start of the entrainment of the second thread can be controlled via the synchronization signal.

[0061] According to a further advantageous embodiment of the invention, the time from the introduction and / or shooting of the leader thread into the paper pulp according to step b) to the generation of a control signal for releasing the holding device according to step e) is between 1 s and 600 s, preferably 10 s to 300 s, particularly preferably 30 s to 60 s. This time period can also be called the anchoring phase. If multiple tracks are provided, the anchoring phase can last for a different length for each track.

[0062] Preferably, the leader thread provided on each track has a length between 50 m and 50,000 m, particularly preferably 500 m to 5,000 m. The leader thread can be arranged on a roll with a length of 10 to 50 km, so that this roll can be reused multiple times for several anchoring phases.

[0063] Preferably, the thread and / or the first thread and / or the second thread and / or the leader thread and / or the original thread is conveyed at a speed in the range from 30 m / min to 150 m / min, preferably in the range from 50 m / min to 150 m / min, particularly preferably in the range from 50 m / min to 110 m / min.

[0064] According to the invention, a method for synchronizing a thread with a paper web to be produced in a paper machine is also claimed. The paper web comprises a repeatedly repeated sequence of first features. The first features can be design features and / or security features and / or windows and / or functional features, such as register marks.

[0065] The thread comprises a repeatedly repeated sequence of second features. The second features can be design features and / or security features and / or functional features, such as register marks. In particular, the first features and / or the second features are designed to be optically readable, machine-readable, and / or sensor-readable.

[0066] A second repeat length of the thread is shorter than a first repeat length of the paper web. The second repeat length of the thread is preferably 0.1% to 10%, more preferably 0.1% to 5%, more preferably 0.2% to 3%, and particularly preferably 0.3% to 1% shorter than a first repeat length of the paper web. For example, the second repeat length of the thread is 2% shorter than a first repeat length of the paper web. The length factor is calculated from the stated percentage values ​​by subtracting these percentage values ​​from the number 1. In the given example of 2%, this results in a length factor of 0.98. The length factor can also be referred to as an elongation reserve.

[0067] The method comprises the following steps, in particular in the following order: a) Applying a pulp to a paper screen to produce the paper web. b) Introducing and / or shooting the thread into the pulp applied to the paper screen so that the thread is connected to the paper web after at least partial drying of the pulp, wherein the paper web at least partially encloses the thread. c) Detecting the register position of the paper web. d) Detecting the register position of the thread by means of a sensor, preferably by means of a first sensor. e) Generating a control signal based on the detected register position of the paper web and on the basis of the register position of the thread detected by means of the sensor, preferably by means of the first sensor, so that the thread is stretched on the basis of the control signal such that the register position of the thread and the register position of the paper web are brought into line.

[0068] The method for synchronizing a thread with a paper web to be produced in a paper machine preferably comprises at least one of the previously mentioned methods according to the invention, that is to say the "method for conveying a thread strand" according to the invention and / or the "method for synchronizing a thread strand with a paper web to be produced in a paper machine" according to the invention.

[0069] The paper web corresponds to the paper web from the inventive "method for synchronizing a thread strand with a paper web to be produced in a paper machine." Therefore, the same terminology is used: first repeat length. The thread corresponds to the original thread from the inventive "method for synchronizing a thread strand with a paper web to be produced in a paper machine." Therefore, the same terminology is used: second repeat length.

[0070] The detection of the register position of the thread by means of a sensor, preferably by means of a first sensor, preferably takes place continuously and in particular during the entire process of integrating the thread into the paper substrate.

[0071] It is also possible for the process steps and substeps to be performed once or multiple times. In particular, process steps and substeps can be repeated. The preferred sequence of process steps comprises at least the order of step a) - step b) - step c) - step d) - step e), whereby, in particular, further steps or substeps can be inserted between these steps.

[0072] By means of the method according to the invention, the thread can advantageously be embedded in the paper web in precise register with windows provided in the paper web, wherein the thread is already introduced into the paper web that is being formed. The thread can either be applied to the paper screen, on which the paper pulp is deposited as a paper web, or the thread can be inserted, in particular on the paper screen, between at least two partial paper webs. This has the advantage that the thread can be enclosed by the paper, at least in some regions, while a solid paper web is formed from the paper pulp and / or from the at least two partial paper webs. This means that the production of the paper web itself and the embedding of the thread take place simultaneously and the thread is thus integrated into the paper web in precise register and thus also becomes an integral part of the paper web.of the paper substrate, which is positioned precisely relative to the window openings in the paper. Subsequent manipulation or replacement of the thread in the paper substrate is thus made more difficult, especially because it is difficult to reinsert the thread into the paper in a precisely registered or precisely positioned manner.

[0073] Further advantageous embodiments of the invention are described in the subclaims.

[0074] According to an advantageous embodiment of the invention, the register position of the paper web is detected after step c) by means of a second sensor detecting the paper screen and / or by means of a third sensor detecting the resulting paper web and / or by means of a rotary encoder of the paper screen and / or by means of a rotary encoder of the paper screen drive. The third sensor detecting the resulting paper web is arranged before or after a drying process. The third sensor detecting the resulting paper web preferably detects the sequence of features of the paper web.

[0075] The following advantageous embodiments can be applied to any of the aforementioned methods.

[0076] According to a further advantageous embodiment of the invention, the features are design features and / or security features and / or functional features, such as register marks.

[0077] According to a further advantageous embodiment of the invention, the features are visible and / or machine-readable. The features can be configured optically or magnetically.

[0078] According to a further advantageous embodiment of the invention, the

[0079] Thread and / or the first thread and / or the second thread and / or the leader thread and / or the original thread have a width of 1 mm to 25 mm, preferably 2 mm to 15 mm, particularly preferably 3 mm to 10 mm.

[0080] According to a further advantageous embodiment of the invention, the thread and / or the first thread and / or the second thread and / or the leader thread and / or the original thread have a thickness of 6 pm to 75 pm, preferably a thickness of 15 pm to 50 pm, particularly preferably a thickness of 20 pm to 40 pm.

[0081] According to a further advantageous embodiment of the invention, the thread and / or the first thread and / or the second thread and / or the leader thread and / or the original thread have an E-modulus in the range of 2500 N / mm 2 up to 5000 N / mm 2 , preferably in the range of 3000 N / mm 2 up to 4500 N / mm 2 , on.

[0082] According to a further advantageous embodiment of the invention, a tensile force in the range from 10 cN (centinewtons) to 1000 cN, preferably in the range from 100 cN to 800 cN, particularly preferably in the range from 150 cN to 600 cN, is exerted on the thread, the first thread, the second thread, the leader thread and / or the original thread.

[0083] According to a further advantageous embodiment of the invention, a tensile force in the range from 10 cN (centinewtons) to 500 cN, preferably in the range from 20 cN to 300 cN, particularly preferably in the range from 30 cN to 100 cN, is exerted on the thread, the first thread, the second thread, the leader thread and / or the original thread.

[0084] The term tensile force can also be expressed using the terms tension, pre-tension, or pre-stretch of the thread. The tensile force required on the paper machine to form a window in the paper web is preferably at least 10 cN, more preferably at least 100 cN. If the tensile force is too low, there is a risk of paper pulp being washed between the paper screen and the thread. This can lead to the window not forming at all or not forming cleanly. The tensile force exerted on the thread primarily determines how strongly the thread is pressed against the paper screen.

[0085] If the tensile force is increased too much, the tension in the embedded thread increases, which can cause the thread to detach from the paper after embedding. The maximum possible tensile force is 1000 cN, preferably 800 cN.

[0086] The shortening of the repeat length of the thread, the extensibility of the thread, and / or the tensile force during thread integration are the preferred thread parameters influencing the process. Other parameters influencing the process may include the basis weight of the paper stock resting on the paper screen, the number of window openings per repeat and / or per sheet, and / or the paper machine speed.

[0087] The tension can be increased to control the register during the start-up phase and when changing a thread spool. During operation, the tension can preferably be kept constant to maintain the register.

[0088] The tensile force specified here in cN (centinewtons) is preferably the tensile force acting on the thread during unwinding, which is approximately 10 cN to 400 cN. Between the unwinding point and the position where the thread runs into the paper substrate or onto the paper screen, several additional rollers can be provided, in particular free-running rollers without their own drive, over which the thread is guided. For each roller, an additional tensile force of 3 cN to 5 cN is added to the thread (as a braking effect due to the frictional forces in the bearings of the roller and / or due to the frictional forces between the thread and the roller and / or due to the deformation energy when the thread is deflected). The inlet tension on the paper screen is therefore between 10 cN and 1000 cN.

[0089] The tension mechanism is preferably located between the unwinder (thread reel) and the paper screen. Depending on the magnitude of the tension the tension mechanism itself exerts on the thread, the unwinder (thread reel) must adjust accordingly. If the tension mechanism exerts more force, the unwinder (thread reel) must run correspondingly slower to prevent excessive thread from being fed in. The unwinder (thread reel) therefore preferably compensates for the tension change upstream of the tension mechanism. The tension mechanism thus defines the infeed tension on the paper screen.

[0090] The thread is stretched to achieve register with a force of more than 30 cN, particularly during the start-up phase or in the pre-run phase when changing the thread roll. Excessive tensile forces acting on the thread often result in waste paper. Once the register is within the desired tolerance, significantly lower tensile forces are sufficient to maintain the register within the desired tolerance.

[0091] According to a further advantageous embodiment of the invention, one thread per track is conveyed to the paper web in several tracks and inserted into the paper web in precise register. The individual threads are preferably conveyed parallel to one another and independently of one another and inserted into the paper web parallel to one another and independently of one another.

[0092] Preferably, four to 24 tracks are provided. Thus, preferably, four to 24 threads are introduced into the paper web simultaneously. According to the invention, a device for carrying out a method for conveying a thread strand, in particular an endless thread strand, is claimed. The device according to the invention is preferably used for carrying out the corresponding method according to the invention.

[0093] At least one moving first thread and one second thread are connected to produce the thread strand. The first and second threads each comprise a repeatedly repeated sequence of features. The device comprises at least one sensor, preferably at least one first sensor, for detecting the register position of at least the first thread, a thread connecting device for connecting the first thread and the second thread, and a control unit for generating a control signal based on the register position detected by the sensor, preferably by the first sensor. The register position of the first thread and the register position of the second thread are aligned when the first thread and the second thread are connected based on the control signal or signals.

[0094] The sequence of features can be design features and / or security features and / or functional features, e.g., register marks. The sequence of features of the first thread is, in particular, identical to the sequence of features of the second thread. Preferably, the structure and features of the first thread are identical to the structure and features of the second thread.

[0095] With the aid of the device according to the invention, the thread can advantageously be embedded in the paper web in precise register with windows provided in the paper web, wherein the thread is already introduced into the paper web that is being formed. The thread can either be applied to the paper screen, on which the paper pulp is deposited as a paper web, or the thread can be inserted, in particular on the paper screen, between at least two partial paper webs. This has the advantage that the thread can be enclosed by the paper, at least in some areas, while a solid paper web is formed from the paper pulp and / or from the at least two partial paper webs. This means that the production of the paper web itself and the embedding of the thread take place simultaneously and the thread is therefore integrated into the paper web in precise register and thus also becomes an integral part of the paper web.of the paper substrate, which is positioned precisely relative to the window openings in the paper. Subsequent manipulation or replacement of the thread in the paper substrate is thus made more difficult, especially because it is difficult to reinsert the thread into the paper in a precisely registered or precisely positioned manner.

[0096] According to an advantageous embodiment of the invention, the thread connecting device comprises a holding device for holding the second thread, preferably for holding the second thread with a known position of the features along the longitudinal extent of the second thread, and / or a device for bringing the second thread into contact with the first thread.

[0097] According to the invention, a device for carrying out a method for synchronizing a thread strand with a paper web is claimed. The device according to the invention is preferably used for carrying out the corresponding method according to the invention.

[0098] The paper web comprises a repeatedly repeated sequence of first features. The first features can be design features and / or security features and / or windows and / or functional features, such as register marks. The thread strand has at least one leader thread and one original thread. The original thread comprises a repeatedly repeated sequence of second features. The second features can be design features and / or security features and / or functional features, such as register marks. The leader thread can have at least functional features, such as register marks.

[0099] The device comprises a pulling device for generating tensile force on the thread. Due to this tensile force, the thread is stretched along its path before being inserted into the paper web.

[0100] The device comprises a paper machine with a paper screen for discharging a pulp to produce the paper web and a device for detecting the register position of the paper web. The device comprises a device for introducing and / or shooting the leader thread into the pulp discharged onto the paper screen, so that the leader thread is connected to the paper web after at least partial drying of the pulp, wherein the paper web at least partially encloses the leader thread.The device comprises a thread connecting device for connecting the leader thread and the original thread and a control unit for generating a control signal on the basis of the detected register position of the paper web, wherein the original thread is entrained by the leader thread and subsequently stretched such that the register position of the original thread and the register position of the paper web are brought into line, wherein the original thread is connected to the paper web after at least partial drying of the pulp, wherein the paper web at least partially encloses the original thread.

[0101] The register position of the paper web can be detected by a second sensor detecting the paper screen and / or by a third sensor detecting the resulting paper web and / or by a rotary encoder of the paper screen and / or by a rotary encoder of the paper screen drive. The third sensor detecting the resulting paper web can be arranged before or after drying. The third sensor detecting the resulting paper web can detect the sequence of features of the paper web.

[0102] With the aid of the device according to the invention, the thread can advantageously be embedded in the paper web in precise register with windows provided in the paper web. The thread is thereby introduced into the paper web that is already being formed. The thread can either be applied to the paper screen, on which the paper pulp is deposited as a paper web, or the thread can be inserted, in particular on the paper screen, between at least two partial paper webs. This has the advantage that the thread can be enclosed by the paper, at least in some regions, while a solid paper web is formed from the paper pulp and / or from the at least two partial paper webs. This means that the production of the paper web itself and the embedding of the thread take place simultaneously and the thread is thus integrated into the paper web in precise register and thus also becomes an integral part of the paper web.of the paper substrate, which is positioned precisely relative to the window openings in the paper. Subsequent manipulation or replacement of the thread in the paper substrate is thus made more difficult, especially because it is difficult to reinsert the thread into the paper in a precisely registered or precisely positioned manner.

[0103] Without appropriately registered splicing, i.e. joining a moving first thread with a second thread, the registered insertion of the thread into the paper web or paper substrate would be lost every time the thread roll is changed and would have to be completely reset. This would result in a high level of waste from paper substrate with an incorrectly positioned embedded thread. This waste is particularly relevant today because, for economic reasons, reducing waste is becoming ever more important and many central banks also demand very precise accounting of how many security elements and quantities of security paper must be destroyed as waste and how much is retained as a usable substrate for security documents, especially banknotes. In order to further reduce waste, it is particularly preferable if the initial gripping of the thread in the paper pulp oran inlet material is used on the paper screen. This inlet material is usually available as a separate roll material. In this case, the inlet material is referred to as a leader thread. Alternatively or additionally, the actual thread can contain the inlet material in a leader area. By using a leader thread, no original thread is used during setup of the device. This results in the advantage that a smaller amount of reject with thread that is not integrated in register with the paper is produced when original threads are used. The use of original thread is often subject to mandatory documentation, so that its use in reject material should be avoided. Furthermore, original thread is more complex to produce and therefore more expensive than leader thread.

[0104] When inserting threads into a paper substrate, it is generally important to ensure the correct position of the thread relative to the paper substrate. It is particularly important that the front and back of the thread are positioned as desired relative to the paper substrate when the thread is embedded in the paper substrate. If the position is incorrect, the thread must be turned to the correct side as it is fed into the paper substrate, i.e., the position of the front and back of the thread relative to the paper substrate must be changed. This change in the position of the thread with respect to its front and back can also be achieved more economically with a leader thread than with an original thread, and with the other aforementioned advantages regarding documentation requirements and avoiding paper substrate waste.

[0105] The position of the thread with respect to the front and back of the thread relative to the paper substrate can be achieved with a leader thread as an alternative or in addition to the precise registration of the thread relative to the paper substrate. This means that the leader thread can be used, as previously mentioned, to achieve precise registration of the thread relative to the paper substrate and / or the leader thread can be used to achieve correct positional insertion of the thread with respect to its front and back relative to the paper substrate.

[0106] According to an advantageous embodiment of the invention, the thread connecting device comprises a holding device for holding the original thread, preferably for holding the original thread with a known position of the features along the longitudinal extent of the original thread, and / or a device for bringing the original thread into contact with the leader thread.

[0107] According to a further advantageous embodiment of the invention, a second repeat length of the original thread is shorter than a first repeat length of the paper web. The second repeat length of the original thread is preferably 0.1% to 10%, more preferably 0.1% to 5%, more preferably 0.2% to 3%, particularly preferably 0.3% to 1% shorter than a first repeat length of the paper web. For example, the second repeat length of the original thread is 2% shorter than a first repeat length of the paper web. The length factor is calculated from the stated percentage values ​​by subtracting these percentage values ​​from the number 1. In the stated example of 2%, this results in a length factor of 0.98. The length factor can also be referred to as an elongation reserve. According to the invention, a device for carrying out a method for synchronizing a thread with a paper web is claimed.The device according to the invention is preferably used to carry out the corresponding method according to the invention.

[0108] The paper web comprises a repeatedly repeated sequence of initial features. The initial features can be design features and / or security features and / or windows and / or functional features, such as register marks.

[0109] The thread comprises a repeatedly repeated sequence of second features. The second features can be design features and / or security features and / or functional features, such as registration marks.

[0110] The device comprises a paper machine with a paper screen for discharging a pulp to produce the paper web and a device for detecting the register position of the paper web. The device comprises a device for introducing and / or shooting the thread into the pulp discharged onto the paper screen, so that the thread is connected to the paper web after at least partial drying of the pulp, the paper web at least partially enclosing the thread.

[0111] The device comprises a pulling device for generating tensile force on the thread. This tensile force causes the thread to stretch before being inserted into the paper web.

[0112] The device comprises a sensor, preferably a first sensor, for detecting the register position of the thread and a control unit for generating a control signal on the basis of the detected register position of the paper web and on the basis of the register position of the thread detected by means of the sensor, preferably by means of the first sensor, wherein the thread is stretched on the basis of the control signal such that the second register position of the thread and the register position of the paper web are brought into agreement.

[0113] The register position of the paper web can be detected by a second sensor detecting the paper screen, and / or by a third sensor detecting the resulting paper web, and / or by a rotary encoder of the paper screen, and / or by a rotary encoder of the paper screen drive. The third sensor detecting the resulting paper web can be arranged before or after drying. The third sensor detecting the resulting paper web can detect a sequence of features of the paper web.

[0114] With the aid of the device according to the invention, the thread can advantageously be embedded in the paper web in precise register with windows or other features provided in the paper web. The thread is thereby introduced into the paper web that is already being formed. The thread can either be applied to the paper screen, on which the paper pulp is deposited as a paper web, or the thread can be inserted, in particular on the paper screen, between at least two partial paper webs. This has the advantage that the thread can be enclosed by the paper, at least in some regions, while a solid paper web is formed from the paper pulp and / or from the at least two partial paper webs. This means that the production of the paper web itself and the embedding of the thread take place simultaneously and the thread is thus integrated into the paper web in precise register and thus also becomes an integral part of the paper web.of the paper substrate, which is positioned precisely relative to the window openings in the paper. Subsequent manipulation or replacement of the thread in the paper substrate is thus made more difficult, especially because it is difficult to reinsert the thread into the paper in a precisely registered or precisely positioned manner.

[0115] According to a further advantageous embodiment of the invention, a second repeat length of the thread is shorter than a first repeat length of the paper web. The second repeat length of the thread is preferably 0.1% to 10%, more preferably 0.1% to 5%, more preferably 0.2% to 3%, and particularly preferably 0.3% to 1% shorter than a first repeat length of the paper web. For example, the second repeat length of the thread is 2% shorter than a first repeat length of the paper web. The length factor is calculated from the stated percentage values ​​by subtracting these percentage values ​​from the number 1. In the stated example of 2%, this results in a length factor of 0.98. The length factor can also be referred to as an elongation reserve.

[0116] Of course, the stated material characteristics can also be applied equivalently in a process or the stated process characteristics can be applied in the product.

[0117] As described above, it is also conceivable for several threads to be conveyed alongside one another in different tracks during the production of a paper web. In particular, a plurality of threads can be conveyed alongside one another in different tracks, and one thread per track can be inserted into the paper web with precise registration. For this purpose, the devices according to the invention can be arranged side by side to insert one thread per track into the paper web with precise registration, or the methods according to the invention can be carried out in parallel and side by side to insert one thread per track into the paper web with precise registration.

[0118] The preferred conveying path of the thread within the scope of the present invention is explained in more detail below. The thread is preferably unwound from a thread spool and fed to the paper screen. The thread preferably runs from the thread spool over various deflection pulleys via a tensioning mechanism and a sensor roll onto the paper screen forming the main former. The sensor roll belongs to a measuring unit for the thread tension. The tensioning mechanism regulates the elongation of the thread. The elongation of the thread can be measured via the measuring unit. The elongation of the thread can also be determined via the first sensor by comparing the thread speed, e.g. from the surface speed of the paper screen, with the time interval between two characteristics of the thread and the unstretched interval between two characteristics of the thread.The tensioning mechanism can be controlled via an electronic control system using the signals from the first sensor related to the yarn and / or the second sensor related to the paper screen. The first sensor related to the yarn preferably detects the register marks of the yarn. The second sensor related to the paper screen preferably detects position characteristics on the paper screen. Instead of coming from the paper screen, the signal from the second sensor related to the paper screen can also originate from the paper web itself and / or from one or more sensors arranged further along the paper web downstream of the paper screen.

[0119] The second sensor related to the paper screen preferably detects positional features directly on the paper screen and / or elements arranged there and firmly connected to the paper screen for generating the windows and / or watermarks in the paper web. The second sensor preferably transmits these signals to the electronic control system. The second sensor related to the paper screen is preferably arranged on the periphery of the paper screen.

[0120] An optional third sensor can be arranged downstream of the paper screen on the paper web and, in one embodiment, represents an alternative to the second sensor related to the paper screen. This is advantageous because the paper screen and the elements connected thereto for generating the windows and / or watermarks in the paper web can have positional tolerances that arise during the manufacture of the paper screen and / or during production due to temperature fluctuations and / or due to aging or wear on the paper screen.

[0121] In a further embodiment, the optional third sensor can also be provided downstream of the paper screen on the paper web in addition to the second sensor related to the paper screen. This can be provided in particular for closed-loop control by comparing the actual values ​​on the paper web downstream of the paper screen with the signals from the sensors arranged on or upstream of the paper screen in the electronic control system, i.e. with the signals from the second sensor related to the paper screen and the signals from the first sensor related to the thread. The third sensor detects in particular the signals of a window and / or a watermark in the paper web. Furthermore, a further optional fourth sensor can be provided for this purpose, also downstream of the paper screen on the paper substrate, which detects the position of the thread in the paper web.In the electronic control system, the signals from the third and / or fourth sensor can be compared with the signals from the first and / or second sensor, and if there are any deviations in the signals, the thread tension or the stretching of the thread can be adjusted.

[0122] At least one drying device is preferably arranged downstream of the paper screen. The paper substrate with the embedded thread can be dried in the drying device. During this drying process, the paper substrate shrinks in length and width while being dried to a desired residual moisture content. It is advantageous if the paper substrate with the embedded thread is stretched, particularly during drying, in order to counteract the shrinkage somewhat and, in particular, to allow the shrinkage process to proceed in a more controlled manner by applying a force in the feed direction to the paper substrate. Such stretching of the paper substrate with the embedded thread can be, for example, 0.5% to 5%, preferably 1% to 3%.

[0123] Due to the changes in the paper substrate during drying, it may also be advantageous to arrange the third and / or fourth sensor downstream of the drying device. It is also possible to arrange the third and / or fourth sensor upstream of the drying device and / or downstream of the drying device.

[0124] A marking device is preferably arranged downstream of the drying device. Marks can be applied and / or introduced onto the dried paper substrate by means of the marking device.

[0125] Using the signals detected by the sensors, the register marks of the thread are preferably aligned or synchronized with the register marks on the paper screen, including a tolerance range. For example, bringing the thread into register during the start-up phase or during roll changes may require higher tensile forces and thus greater thread stretch than during operation when the register is "stuck."

[0126] With this solution, it is particularly preferred if the splicing, i.e. the addition of a new thread to the end of a previously used thread, takes place in register or “close to register”. This has the advantage that the register to the paper screen is maintained within the desired tolerance or can be quickly achieved again within the desired tolerance. A further fifth sensor related to the thread can be arranged upstream, i.e. in the running direction before the splicing device. The further fifth sensor related to the thread records the register mark of the thread used upstream of the splicing device. The further fifth sensor related to the thread can be provided alternatively to the first sensor related to the thread or in addition to the first sensor related to the thread. The first sensor related to the thread is preferably arranged downstream of the splicing device.The fifth sensor related to the thread can support splicing close to the register.

[0127] In a preferred embodiment, two sensors are provided for detecting the register marks of the thread. The fifth sensor, located upstream of the splicing device, detects register marks provided in the outgoing and / or lower and / or first thread. This can assist splicing close to the register. The first sensor, related to the thread, is located downstream of the splicing device and serves to adjust the elongation of the thread in order to establish or maintain register with the paper web.

[0128] According to an advantageous embodiment of the invention, the thread and / or the first thread and / or the second thread and / or the leader thread and / or the original thread have an E-modulus in the range of 2500 N / mm 2 up to 5000 N / mm 2 , preferably in the range of 3000 N / mm 2up to 4500 N / mm 2 , on. To determine the Young's modulus, different yarns with different layer structures were measured. The yarns used differed in their structures, particularly in their thickness and number of PET carrier films, with so-called full yarns with two PET carrier films and so-called half yarns with one PET carrier film being measured. The yarns used also differed in the number of layers and in the chemical formulation of the layers on the PET carrier film(s). The Young's modulus was determined in accordance with DIN ISO 527-1-3. For this purpose, 100 mm long yarn sections with a width of 3 mm, 4.5 mm and 5 mm and a thickness in the range between 25 pm and 37 pm were clamped in a Zwick measuring device (Zwick Z005 from Zwick GmbH & Co. KG, Ulm) and measured.

[0129] During the start-up phase, a thread, preferably a leader thread, is shot into the paper pulp forming the paper web for the first time for each track to be used. The time it takes for the respective thread, preferably the leader thread, to engage in the paper pulp and on the paper screen, i.e. until it is reliably carried along, varies slightly from track to track. In this process, the thread, preferably the leader thread, is "pulled into register" in each track. As soon as this has happened on all tracks, i.e. immediately after the end of the start-up phase, the threads in all tracks are spliced ​​in register, i.e. connected to newly fed thread spools. Preferably, the leader thread is connected to an original thread in each case.

[0130] The leader thread preferably corresponds to the first thread. In a special version, the leader thread also generates a register signal or has register marks, but no security features. This means that after gripping, the leader thread can also be used to set a register with the paper web, thus saving original thread. The register marks can also be suitable for sensor-based detection of the front and / or back of the thread and thus its position.

[0131] The original thread preferably corresponds to the second thread and is preferably manually clamped in the holding device at a known position. If the leading thread has no register marks, the trigger signal for the holding device preferably comes from a sensor on the paper screen (a somewhat less accurate signal than a register signal from a thread sensor), allowing the original thread to enter "close to the register."

[0132] The process often runs with paper webs approximately 750 mm (1x superformat = 820 mm) to 3000 mm (4x superformat) wide and 5 or 6 tracks per "superformat" with blanks. Thus, up to 24 threads can run into the same paper pulp simultaneously. Additional, fully embedded threads can also run into the paper pulp.

[0133] To further reduce waste, it is particularly preferred to use an inlet material for the initial gripping of the thread in the paper pulp or on the paper screen. This inlet material is preferably provided as a separate roll material. In this case, the inlet material is referred to as the leader thread. Alternatively or additionally, the actual thread can contain the inlet material in a leader area.

[0134] The leader thread can be designed without register marks and / or without other functional and / or decorative features. In an alternative embodiment, the leader thread can have at least functional features, in particular in the form of register marks.

[0135] The leader thread preferably has a clearly recognizable pattern (for example, a "Vorlaut / Preload" label and / or a clearly recognizable pattern). The leader thread preferably has a surface whose adhesive properties do not differ from those of the original thread. The original thread is understood to be the thread used in normal operation. The original thread therefore includes, in particular, design features and / or security features and / or functional features, such as register marks. As the leader thread runs into the paper web or into the paper pulp forming the paper substrate, an initial anchoring of the respective leader thread is created on all tracks in the paper substrate, but in one version still without register with respect to the windows in the paper substrate. This anchoring phase can last different lengths for each track, in particular between 1 second and 600 seconds.It is therefore advantageous to use a leader yarn on separate rolls as infeed material. The leader yarn preferably has a length of between 50 m and 50,000 m on each track or roll, particularly preferably 500 m to 5,000 m. This initial anchoring phase occurs particularly during machine start-up of the paper machine and / or during a job change, or in situations where the continuous process flow is disrupted to such an extent that a process restart is necessary. During the restart, the yarn is injected into the paper pulp forming the paper web or paper substrate, and the register is readjusted.

[0136] In an alternative embodiment, the leader thread can have register marks which can be detected by a sensor, preferably by the first sensor, during and / or before and / or after the leader thread is gripped in the paper pulp and converted into sensor signals. These sensor signals can be used to set a register, i.e. a positional accuracy between the leader thread and the paper web. This has the advantage that not only during the anchoring phase, but also during the positioning phase, i.e. during the initial adjustment of a register between the thread and the paper web, not the original thread with security features is used up, but rather the leader thread, which results in less waste that is sensitive from a security point of view. If the original thread is then joined to the leader thread, a register between the paper web and the thread is already created.The register marks can also be designed to sensor-detect the front and / or back of the thread and thus its position. Once all tracks have engaged, and in particular, the register between the leader thread and the paper web has been reached, an original thread is spliced ​​close to the leader thread in all tracks at the same time or at different times. The register between the thread and the windows in the paper substrate is then adjusted using the original thread.

[0137] The leader thread can be arranged on a reel with a very long running length, so that this reel can be reused several times for several anchoring phases and in particular also positioning phases.

[0138] Alternatively or additionally, to further reduce waste, it is preferred for each thread spool to have a preload area. This preload area has no security-relevant features, but merely register marks and / or other functional and / or decorative features. For example, the preload area has a "Vorlauf / Preload" label and / or a clearly recognizable pattern. Preferably, the preload area has a surface whose adhesion properties do not differ from those of the original thread. The preload area is preferably between 100 m and 1500 m long, particularly preferably between 200 m and 1000 m long.

[0139] As the leader section runs into the paper substrate, the register is established with the help of the register marks in the leader section so that when the end of the leader section is reached, the register between the thread and the paper screen is within the desired tolerance and there is very little or no waste when the thread with security features runs in. As the leader section runs into the paper substrate, the position of the thread in relation to the front and back of the thread relative to the paper substrate can also be adjusted, in particular to prevent and / or correct unwanted twisting of the thread. So that when the end of the leader section is reached, the position of the thread in relation to the front and back of the thread relative to the paper substrate is correct and there is very little or no waste when the thread with security features runs in.

[0140] It is preferred if the leader area has optical and / or magnetic and / or other features by which the paper substrate with embedded leader area can be easily detected and sorted out.

[0141] The paper substrate produced in this start-up phase, which represents rejects, then preferably only contains infeed material (i.e. leader thread or leader area) and can be easily detected and selected, particularly by sensory means, via its marking or via its other optical or functional appearance or behavior.

[0142] For particularly good detectability of rejects, it is further advantageous if a marking device is provided in the conveying path of the paper substrate downstream of the paper screen and more preferably downstream of the dryer device. This marking device is activated by the electronic control system such that an optically detectable mark is generated on the paper substrate if there is not sufficiently precise register between the thread and the paper substrate and / or during the start-up phase with inlet material embedded in the paper substrate. The marking device can preferably be an inkjet print head or another electronically controllable printing module for dispensing optically and / or electrically detectable substances onto the paper substrate. Due to the comparatively large width of the moist orWhen the paper web is wet on the paper wire and further downstream of the paper wire, the edge regions of the paper web are drier and thus shorter than the areas of the paper web located between the edges. These edge regions therefore shrink less during the subsequent drying process. Preferably, the tensile force exerted on the relevant threads in these edge regions is adjusted accordingly when adjusting the register between the thread and the paper web. For example, an offset value for the tensile force can be stored in the control system for these edge regions.

[0143] The invention will be explained below using several exemplary embodiments with the aid of the accompanying drawings. The exemplary embodiments shown are therefore not to be understood as limiting.

[0144] Fig. 1 shows a schematic drawing of an arch.

[0145] Fig. 2 shows a schematic drawing to explain the

[0146] Repeat length.

[0147] Fig. 3 shows a schematic drawing of the arrangement of windows within a single panel, for example a banknote.

[0148] Fig. 4 shows a schematic drawing of the arrangement of a

[0149] Thread intended image motif with respect to a window provided in the paper web.

[0150] Fig. 5 shows a schematic drawing of the arrangement of a

[0151] Thread provided image motif with respect to a web provided in the paper web. Fig. 6 shows a schematic drawing of a first

[0152] Example design.

[0153] Fig. 7 shows a schematic drawing of a second

[0154] Example design.

[0155] Fig. 8 shows a schematic drawing of a third

[0156] Example design.

[0157] Fig. 9 shows a schematic drawing of an exemplary

[0158] arch.

[0159] Fig. 10 shows a thread connecting device with a

[0160] Pulling device and a first sensor in a front view when winding a first thread.

[0161] Fig. 11 shows the thread connecting device with a

[0162] Pulling device and a first sensor in a front view when applying a second thread to the first thread.

[0163] Fig. 12 shows the thread connecting device with a

[0164] Pulling device and a first sensor in a front view when depositing the second thread and taking the second thread along by the first thread.

[0165] Fig. 13 shows the thread connecting device with a

[0166] Pulling device and a first sensor in a front view after cutting the first thread. Fig. 14 shows schematically the steps of a method for

[0167] Connecting the first and second threads.

[0168] Fig. 15 shows a schematic drawing of a first variant of

[0169] Paper path and thread path on paper screens.

[0170] Fig. 16 shows a schematic drawing of a second variant of

[0171] Paper path and thread path on paper screens.

[0172] Fig. 17 shows a schematic drawing of a paper machine for the first variant from Fig. 15.

[0173] Fig. 18 shows a schematic drawing of a paper machine for the second variant from Fig. 16.

[0174] Fig. 1 shows a schematic drawing of a sheet 1. Such a sheet is produced by applying a paper pulp or paper slurry to a paper screen and drying it. According to the invention, a thread is inserted into the paper pulp or paper slurry in register. A plurality of sheets can then be cut from the paper web, with Figure 1 showing such a sheet 1 as an example.

[0175] The sheet 1 has a gripper edge 2 and a trailing edge 3 in the running direction L. The gripper edge 2 preferably has an extension of 20 mm to 50 mm in the running direction L, for example an extension of 25 mm. The trailing edge 3 preferably has an extension of 10 mm to 30 mm in the running direction L, for example an extension of 15 mm.

[0176] Furthermore, the sheet 1 has a plurality of individual panels 4. The individual panels 4 are, for example, banknotes. The gripper edge 2 and the trailing edge 3 form an overhang on at least two opposite sides of the sheet in the running direction L. Accordingly, the embedded thread must also have a similar overhang. This ensures that the embedded thread and the paper web have the same repeat length. The repeat length RP of the paper web preferably corresponds to the length of a sheet 1 in the running direction L, including the gripper edge 2 and the trailing edge 3.

[0177] Fig. 2 shows a schematic drawing to explain the repeat length.

[0178] In general, the sheet length 1a on the paper web 100, i.e., the length of a sheet 1 in the running direction L (including gripper margin 2 and trailing margin 3), corresponds to a maximum of the repeat length RP on the paper web 100. The sheet length 1a can also be shorter than the repeat length RP of the paper web 100. In this second case, the sheet is made up as a so-called "double cut." This creates a short paper section that must be disposed of.

[0179] The register of the thread 10 to the paper web 100 is generated sheet by sheet. The register of the thread 10 is thus generated relative to the sheet and therefore not relative to individual windows or to a single panel 4, for example, to a single banknote 8 within the sheet.

[0180] The repeat gap 5 is the area consisting of the gripper edge 2 and the trailing edge 3 and, if applicable, also consisting of the paper area to be disposed of by double cutting. The entirety of the individual sheets 4 is also referred to as the banknote area 7. In this repeat gap 5, there is preferably at least one tax stamp. The tax stamp can be formed as a watermark 6 on the paper web 100. In the repeat gap 5, the sheet cut for separating the sheets, i.e., for forming individual sheets, is also performed. The sheet cut is preferably carried out once in each case. Alternatively, the sheet cut can be carried out twice in each case, as already explained above.

[0181] In addition to purely design features, the thread 10 also has functional features, particularly register marks. The register marks serve as alignment marks in the thread manufacturing process, but primarily in the application process for the precise registration of the threads 10 in the paper web 100 with the windows created there. A particular challenge here is that the windows are created practically simultaneously with the embedding of the thread, and the paper web 100 is still very flexible and "inaccurate," making registration difficult.

[0182] The repeat length RF of the embedded thread 10 and the repeat length RP of the paper web 100 correspond. Accordingly, the repeat of the embedded thread 10 is divided into a design area 11 and the repeat gap 5. The reference symbol 11a denotes the length of the design area in the running direction. The position of the design area 11a preferably corresponds to the position of the banknote area 7 of the corresponding sheet 1. In the repeat gap 5, the embedded thread 10 preferably has at least one register mark 12. The position of the register mark 12 preferably corresponds to the position of the control mark of the corresponding sheet 1. Preferably, exactly one register mark 12 is arranged on the thread 10 per repeat length RF, i.e., per sheet 1. Preferably, a position signal from the paper screen is measured for each sheet 1, along with a position signal from the register mark 12 on the thread 10.However, it is also possible for multiple register marks 12 to be arranged on the thread 10 per repeat length RF. Accordingly, it is also possible for more than one position signal to be measured per repeat length RF, particularly on the thread 10. Accordingly, it is also possible for more than one position signal to be measured per sheet 1 on the paper screen. Preferably, one position signal is measured from the thread 10 and one position signal is measured from the paper screen.

[0183] The register mark 12 is preferably arranged on the thread 10 in the running direction L within the repeat gap 5. Alternatively or additionally, at least one register mark 12 in the form of a structure and / or a motif can be arranged as part of the design in the window area. Alternatively or additionally, at least one register mark 12 in the form of a UV feature can be arranged as part of the design in the window area. A UV feature is a feature that can be read when irradiated with UV radiation (UV = ultraviolet). Alternatively or additionally, at least one register mark 12 in the form of a magnetic code can be arranged as part of the design at any position within the repeat length RF.

[0184] In the repeat gap, in particular in the gripper edge 2 or in particular in the trailing edge 3, a window is provided in the paper substrate which reveals a register mark of the thread.

[0185] Fig. 3 shows a schematic drawing for the arrangement of a plurality of windows 9 within a single blank 4, for example a banknote 8. The banknote 8 has an upper note edge 8a and a lower note edge 8b in the running direction L of the paper web 100. The windows 9 are preferably at a distance of 4 mm to 10 mm, particularly preferably a distance of 5 to 7 mm, from the upper note edge 8a. The distance of the windows 9 to the upper note edge 8a is, for example, 5 mm. The windows 9 are preferably at a distance of 4 mm to 10 mm, particularly preferably a distance of 5 mm to 7 mm, from the lower note edge 8b. The distance of the windows 9 to the lower note edge 8b is, for example, 5 mm. A web 9a is preferably formed between two adjacent windows 9. The web height, i.e. the height of the web or the distance between two adjacent windows 9, is preferably 4 mm to 10 mm, particularly preferably 5 mm to 7 mm.In the example shown, the web height is 5 mm.

[0186] The window height, i.e. the height of a window 9 or the distance between two adjacent webs 9a, is preferably 5 mm to 25 mm, particularly preferably 6 mm to 15 mm.

[0187] Fig. 4 shows a schematic drawing for the arrangement of an image motif provided in the thread 10 with respect to a window 9 provided in the paper web 100 after the embedding of the thread 10. It is assumed that the window 9 is formed at the desired position.

[0188] The thread 10 preferably has an individual image arranged in register with the window 9. A different individual image can be provided in each window 9 on an individual item 4, for example a banknote 8. The individual images can have different optical and / or machine-readable features. Different first features, such as colors and / or motifs and / or structures and / or effects and / or patterns, can be provided. Identical first features can be provided, for example an endless design or identical individual images. In this case, different second features, such as a UV feature and / or a magnetic code, can be provided.

[0189] Above and below the individual image, there are tolerance ranges that may slide below the paper bridge, i.e., below the paper bridge 9a, within the tolerance range. The individual image with tolerance ranges is thus larger than the window, while the individual image without the tolerance ranges is smaller than the window:

[0190] It refers to

[0191] A the image motif in the window after embedding,

[0192] B the position tolerance for the image motif,

[0193] C1 , C2 the window edge blur caused by the paper mass, and

[0194] D is the nominal window size.

[0195] Due to the window formation from the paper pulp in the paper web 100 and due to the subsequent drying of the paper web 100, the length of the areas C1, C2 is not fully controllable and thus the nominal window size D is also not fully controllable.

[0196] The image motif created in the window after embedding may therefore have the following maximum length:

[0197] A = D - 2 x B - C1 - C2

[0198] Thread 10 is stretched during the integration process. For example, thread 10 is stretched by 2%. This inevitably shortens the design, or the repeat length RF, of the incoming thread by 2%.

[0199] In the following calculation,

[0200] Z the image motif in the window before embedding

[0201] X is the length factor.

[0202] The image motif Z on the not yet embedded thread is shorter by the length factor X than the image motif A after embedding. Z = X x A with X < 1 or

[0203] Z = X x (D - 2 x ß - C1 - C2)

[0204] Concrete example for an image motif in the window with 4.5 mm, i.e. A = 4.5 mm:

[0205] Z = X x A with X < 1

[0206] Z = 0.98 x 4.5 mm = 4.41 mm

[0207] The length factor Z of 0.98 corresponds to an “elongation reserve” of 2%.

[0208] Fig. 5 shows a schematic drawing of the arrangement of an image motif provided in the thread 10 with respect to a web 9a provided in the paper web 100 after the embedding of the thread 10.

[0209] The image motif A remains 100% visible. The position tolerance B for the image motif is usually less than 100% visible. S denotes the area of ​​the thread that is never visible below the bridge 9a. The area consisting of B, S, and again B forms the maximum possible area 9b over which the bridge 9a may extend.

[0210] Fig. 6 shows a schematic drawing of a window 9 for a first, second and third example design in the areas A and B. In this case, the image motif A is in each case an individual image that is 100% visible. The positional tolerance B comprises a design in which it is not noticeable if there is an offset. The first example design (left) shows a shading in the positional tolerance B. The second example design (middle) shows a pattern in the positional tolerance B. The third example design (right) shows an open area in the positional tolerance B. Fig. 7 shows a schematic drawing of a banknote 8 for a fourth example design. The banknote 8 has three windows 9. Each of the windows 9 shows a different individual image which is provided on the thread 10.

[0211] Fig. 8 shows an enlarged section of the banknote 8 for the fourth example design from Fig. 7. The two upper windows 9 are shown and the extension of the image motif A as well as the extension of the area B', which is formed from B, S and again B, are marked.

[0212] Fig. 9 shows a schematic drawing of an exemplary sheet 1, more precisely a banknote sheet with banknote 8 according to Fig. 7. The sheet 1 has 3 x 6 banknotes 8 as individual panels 4. Each banknote 8 has three windows 9, each of which displays a different individual image. Three threads 10 are embedded in the sheet 1. Each of the three threads 10 has the same sequence of the three individual images. The sheet 1 has, as shown in Fig. 1, a gripper edge 2 and a trailing edge 3, in each of which windows 9 are provided, in which regions of the thread 10 are visible and here in particular show register marks 12, at which the register accuracy of the thread 10 to the sheet 1 can be determined particularly well, for example by optical sensors.

[0213] The aim is the design integration of the thread 10 into a document, for example into a banknote 8, in register with other design features on the document. If there are defined motifs in the individual windows 9 that always remain the same and also have the same position, these motifs can be an integrated part of an overall design of the document (e.g. banknote). In particular, at least one motif in a window 9 and at least one further motif or design feature of the document can form a composite design or motif. The thread 10 preferably has a design that is aligned with and / or adapted to the windows 9 in the paper web 100 and / or to the intermediate paper bridges in the form of the webs 9a.

[0214] Figures 10 to 13 show a front view of a thread connecting device 20 during the winding of a first thread 10b. The thread connecting device 20 has a plate-like support structure 21. The support structure 21 is arranged between a supply station for threads and a processing device in which the thread strand is processed into a product (not shown here).

[0215] The support structure 21 can be arranged in a stationary or movable manner. For example, the support structure 21 can be pivoted downward / forward via a mechanism (not shown) on the handle, visible, for example, in Fig. 10, to facilitate the insertion of the threads. In normal operation, when the support structure 21 is not pivoted downward, it can be located above head height, for example.

[0216] The threads are fed to the thread joining device 20 from a supply device. The supply device can be a first spool for supplying a first thread and a second spool for supplying the second thread (possibly with a plurality of additional spools with additional threads). However, it is also possible for the supply station to be a production device that produces a first thread and a second thread.

[0217] It is also possible to use the thread connecting device 20 to enable a change between two different thread types, e.g., with different design features and / or security features and / or functional features. In particular, this also allows a change between a leader thread and an original thread.

[0218] After the thread(s) have passed through the thread-joining device, they are processed in a processing device. This processing device could be, for example, a manufacturing device for a security document such as a banknote, where the strand of thread formed by the threads is a security thread that is embedded in the base material of the banknote.

[0219] A conveying path 22 for a first thread 4 is formed in the thread joining device 20. The first thread 10b is conveyed continuously along the conveying path 22, which can occur at a constant speed, a varying speed greater than zero, or intermittently with a regular pattern of varying speeds. Furthermore, a path 24 (see Figs. 11 to 13) for a second thread 10c is formed in the thread joining device 20. Initially, no conveying movement of the second thread 10c occurs in the path 24 before the joining of the threads 10b, 10c. However, an approaching or merging movement of the path 24 occurs in the direction of the conveying path 22.

[0220] The thread connecting device 20 has a guide device 26, a wetting device 27, a cutting device 28, a guide device 29, a guide device 30 and a guide device 31, which interact with the first thread 10b in this direction in the conveying direction of the first thread 10b in the conveying path 22.

[0221] The thread connecting device 20 has the guide device 26, a clamping device 32, a joining device 33, the guide device 31 and a holding device 34, which in this

[0222] order along the path 24 of the second thread 10c.

[0223] The guide device 26 arranged at the entrance of the thread connecting device 20 consists of two cylindrical guide rollers which have a stepped widening at their free end regions and whose rotational axes are oriented vertically here. The outer surface of the guide rollers with the smaller diameter interacts with the threads 10b, 10c, so that the longitudinal extent of this partial region of the guide rollers is dimensioned such that this region extends into the conveying path 22 and the path 24. The guide rollers are rotatably mounted on a carrier. The carrier, in turn, is held to the support structure 21 via a support element, designed here as an L-shaped angle plate. Fine adjustment of the guide device 26 can be achieved by rotating the carrier relative to the support element about an adjustment axis oriented parallel to the rotational axis of the guide rollers.When viewed in the conveying direction of the first thread 10b, the guide rollers form a vertical gap, the width of which can be adjusted using the adjustment mechanism described above. The guide device 26 serves to guide the thread 10b in a horizontal plane and transversely to its conveying direction.

[0224] The wetting device 27 has a connection via which the liquid is supplied to the wetting device 27, which liquid is to be applied as wetting 39 to the first thread 10b. Furthermore, the wetting device 27 has an outlet-side nozzle via which the dispensing behavior of the liquid from the wetting device 27 is specified. The liquid can in particular be water. The wetting device 27 further has an electronically controlled valve and an electronic control connection for controlling the valve via an electronic control unit. The wetting device 27 can be activated by means of the valve when a connection of the threads 10b, 10c is to be made, and it can be deactivated when no connection of the threads 10b, 10c is made.

[0225] Figures 10 to 13 show a thread connecting device 20 according to Fig. 10 at different times during the execution of a method for connecting the two threads 10b, 10c. This method is also explained using the process sequence according to Fig. 14:

[0226] In a method step 60, for which the thread connecting device 20 is shown in Fig. 10, the first thread 10b is transported along the conveying path 22 with a conveying movement 61 through the thread connecting device 20 and fed to the downstream processing device.

[0227] In a method step 62 shown in Fig. 11, the second thread 10c is inserted into the thread connecting device 20. The method step 62 can be carried out before the start of the conveying operation for the first thread 10b, so that on the one hand the first thread 10b is inserted into the thread connecting device 20 and on the other hand the second thread 10c is inserted into the thread connecting device 20 and, even before the start of the conveying operation for the first thread 10b, provision is made for a later change from the conveyance of the first thread 10b to the second thread 10c. However, it is also possible for the second thread 10c to be inserted when the first thread 10b has been conveyed for a predetermined time and / or a predetermined and possibly measured length of the first thread 10b has been conveyed and / or an approach to or reaching of an end section 78 of the first thread 10b occurs.

[0228] In method step 62, in a method step 63, the clamping device 95 is first removed from the holding device 34 and a free end of the initial section 64 of the second thread 10c is clamped between the clamping surfaces. This can take place, for example, in the region of a spool on which the second thread 10c is wound. The clamping device 95 is opened manually, the end is inserted between the clamping surfaces and, with the removal of the manual actuating forces, the clamping device 95 moves into the clamping position due to the action of the clamping spring. Subsequently, the initial section 64 of the second thread 10c is inserted into the thread connecting device 20. For this purpose, the initial section 64 is inserted into the guide device 26 in a method step 65.In a method step 66, the clamping device 32 is opened by manually actuating the operating lever 50, and the initial section 64 is placed between the clamping plate and the clamping jaw. If the manual actuating force from the operating lever 50 is removed, the spring closes the clamping jaw, whereby the initial section 64 is clamped by the clamping device 32. In this case, the cutting device 28 is not actuated to an extent that would lead to the severing of the first thread 10b. In method step 67, the initial section 64 is placed against the guide roller 52. The wrap angle of the guide roller 52 can be only a few degrees (in particular 1° to 10° or 2° to 6°). Furthermore, the initial section 64 is guided along the combining roller 59. In method step 68, the initial section 64 is guided by the guide device 31.Finally, in a method step 69, the clamping device 95 is fastened or suspended from the carriage of the holding device 34. In the thus inserted state, the conveying path 22 is spaced from the path 24, so that a gap exists everywhere between the two threads 10b, 10c. The combining device 33 is in the inactive operating position, whereby a small gap still exists between the threads 10b, 10c in a working area 70 of the combining device 33. Throughout all of the aforementioned method steps, the thread 10b continues to be conveyed uninterruptedly with the conveying movement 61, while the second thread 10c is not conveyed. In this case, a rotation of the guide roller 53 and / or the deflection roller 54 is caused by the friction of the first thread 10b with them. However, it is also possible, for example, for the deflection roller 54 to be driven by a drive not shown here.

[0229] In process step 71, the actual production of the adhesive connection of the two threads 10b, 10c takes place (see Fig. 12):

[0230] For this purpose, in a method step 72 (in particular by the control unit via the valve), the wetting device 27 is first controlled such that it dispenses the liquid 73, whereby a wetting 39 is generated on the first thread 10b on the side facing the second thread 10c.

[0231] When the section of the first thread 10b provided with the wetting 39 reaches the working area 70 of the combining device 33, the combining device 33 is actuated in a method step 74 (in particular by the control unit via the valve), which results in the pivoting lever 91 being pivoted in the pivoting direction 75. This results in the combining roller 59 with the friction rings coming into contact with the outer surface of the deflection roller 54. As a result of the frictional contact thus formed, the combining roller 59 is set in rotation. The height of the friction rings and the elasticity are designed such that the second thread 10c is placed between the outer surface of the thread guide surface and the outer surface of the deflection roller 54 onto the first thread 10b provided with the wetting 39 and is pressed against it.The prerequisite for the movement of the second thread 10c in the longitudinal direction is its release by the holding device 95 and the clamping device 32. Due to the adhesion ensured by the wetting 39, the second thread 10c is entrained by the first thread 10b. This can occur immediately or through a gradual acceleration of the second thread 10c with decreasing slippage. Initially, only a tensile force is exerted by the first thread 10b. As the second thread 10c is set in motion, the guide roller 52 is also rotated as a result of the pressure or wrapping.

[0232] Shortly before this joining, simultaneously with this joining, or shortly after this joining, the actuator 57 is actuated in a process step (in particular via the control unit and the valve) such that the clamping device 95 is transferred to the non-clamping position, whereby the free end of the second thread 10c is released and, due to its own weight and the force of gravity, can fall onto the first thread 10b. To prevent the second thread 10c from coming to rest horizontally next to the first thread 10b, the second thread 10c can be guided horizontally by the guide device 31.

[0233] Before the joining, during the joining, or shortly after the joining, the clamping device 32 is further moved into the release position (particularly via the control unit's control of the valve), for which purpose the actuator 46 performs the first partial stroke. Even in the release position of the clamping device 32, it continues to hold the second thread 10c above at a distance from the first thread 10b, so that the joining of the threads 10b, 10c only occurs in the working area 70 of the joining device 33.After this connection has been made, a connecting section of the thread strand is fed to the processing device downstream of the thread connecting device 20 for the shortest possible time and for a short length of the section of the thread strand, in which the initial section 64 of the second thread 10c rests on the end section 78 of the first thread 10b and these are adhesively connected to one another via the wetting 39 until the free end of the end section 78 of the first thread 10b is reached. However, it is advantageous if the connecting section, in which the threads 10b, 10c overlap, is kept as short as possible. In an optional method step 80 shown in Fig. 13, a no longer required residual end 81 of the first thread 10b can be severed via the cutting device 28 downstream of the connecting section, the length of which is dimensioned such that a sufficient adhesive effect is achieved.Here, the actuator 46 of the clamping and cutting device 41 is controlled via the control unit to also execute the second partial stroke, at the end of which the cutting blade severs the first thread 10b. Finally, in a method step 82, the second thread 10c is released by the clamping device 32 such that it can assume the position of the first thread 10b in normal conveying operation according to Fig. 10, whereby the second thread 10c is moved along the conveying path 22 and the second thread 10c becomes the first thread 10b, with regard to a possible later joining process with another thread. At the same time or in a temporally close manner, the control unit returns the combining device 33 to the inactive operating position, in which there is no frictional contact between the combining roller 59 and the deflection roller 54.

[0234] It is possible for a first thread 10b to be connected to a second thread 10c only once. However, it is also possible for this process to be performed each time an end of a thread is reached, so that a thread strand 79 is created whose length corresponds to a multiple of the length of a thread 10b, 10c.

[0235] With the method according to the invention, in particular, the joining of the threads 10b, 10c can be carried out without the use of auxiliary means external to the process, such as an adhesive strip, an adhesive, or a sewing thread. Instead, water, for example, can be used for the liquid 73, which is used in the manufacturing process anyway or is volatile without leaving any residue. Furthermore, the method according to the invention should make it possible to join pairs of threads together in parallel and simultaneously, coordinated by the control unit or several interconnected or communicating control units.

[0236] It is possible that the wetting device 27 has an atomizer for the liquid 73, which can be formed with the nozzle or otherwise.

[0237] The wetting 39 of the first thread 10b can be designed and the pressing of the threads 10b, 10c in the region of the combining device 33 can be carried out in such a way that nothing else, and in particular no air, is arranged between the threads 10b, 10c apart from the liquid.

[0238] It is possible for the combining roller 59 and / or the deflection roller 54 to be elastic. In addition to the explained operating positions of the combining device 33, the combining device 33 can be moved (via the control unit or, under certain circumstances, manually) into an extended opening position, in which the insertion of the second thread is simplified.

[0239] It is possible for the deflection roller 54 to be made of a high-density material or equipped with additional rotating masses and thus to have a greater inertia than the joining roller 59 (for example, at least 1.5 times greater, at least twice as large, at least three times as large, or at least five times as large), so that the large inertia of the deflection roller 54 can be used to accelerate the joining roller 59. It is also possible for any of the rollers 52, 53, 54, 59 to be driven by an additional drive to support the conveying movement.

[0240] Optionally, in a method step 84, a color marking, for example, by applying a color to the connecting section 83 can be carried out, so that after the connecting section 83 has been fed to the processing process, the subsequent separation of the products which are produced by the processing process and in which the connecting section 83 is located can be simplified.

[0241] If the actuator 46 is pneumatic, the two partial strokes can be differentiated by different pressure levels when actuating the pneumatic actuator 46, so that a corresponding pressure control device can be used. As the second thread 10c accelerates, it begins a conveying movement 85, which approaches the speed of the conveying movement 61 as the slip decreases.

[0242] The narrow cylindrical outer surfaces of the friction rings form driver surfaces that can be driven by the outer surface of the deflection pulley 54. Due to the radial dimension of the friction rings, a gap forms between the outer surface of the deflection pulley 54 and the outer surface of the thread guide surface, which reduces the holding force of the second thread 10c on the joining pulley 59. A normal force acting on the threads 10b, 10c between the deflection pulley 54 and the joining pulley 59 can be structurally predetermined by the elasticity of the joining pulley 59, the friction rings and / or the deflection pulley 54, as well as the radial dimension of the friction rings.

[0243] The description and the patent claims also refer to parallel operation of a plurality of thread-connecting devices for the simultaneous provision of a plurality of thread strands for a common processing process or a plurality of parallel processing processes. Here, the same reference numerals are used for identical components of the different parallel devices, with the corresponding devices operated in parallel then being differentiated from one another by an additional letter a, b, ... The width of the threads 10b, 10c is preferably in the range from 1 mm to 25 mm, more preferably in the range from 2 mm to 15 mm, with the thickness of the threads 10b, 10c for both specified ranges being in the range from 6 pm to 100 pm, preferably in the range from 20 pm to 50 pm, particularly preferably in the range from 25 pm to 35 pm.

[0244] As an alternative to the previously described embodiment, it is possible for the same (then multifunctional) valve to be used to control the pneumatic actuator for the clamping device 32 and for the control of the pneumatic actuator 90 for the control of the combining device 33. In this case, the pneumatic design is such that the same pneumatic pressure controlled via the multifunctional valve is sufficient to switch the combining device 33 from the inactive operating position to the active operating position and simultaneously transfer the clamping device 32 to the non-clamping operating position, without the clamping device 32 opening into the more open operating position and thus also actuating the cutting device 28.In this case, the excess end portion of the first thread 10b can be trimmed after the adhesive bond has been established by manually operating the operating lever 50. The second thread 10c can be manually added during the ongoing process if the first thread 10b is not yet finished. The paper production process is not interrupted. The areas where the threads 10b, 10c are doubled can be marked and later separated.

[0245] Figures 15 and 16 show two different ways of guiding the thread 10 to the paper screen in order to introduce the thread 10 into the paper web 100. The actual paper screen is referred to below as the main former 101. A further paper screen, called the preformer 102, is arranged upstream of the main former 101. Furthermore, a couch roll 103 is arranged downstream of the main former. The English terms mainformer, shortformer, and suction couch roll are also commonly used for main former 101, preformer 102, and couch roll 103.

[0246] Fig. 15 shows a schematic drawing of a first variant of paper path and thread path on the paper screens.

[0247] In the first variant, the thread 10 enters the main former 101 from below. This creates a long loop around the main former 101 in a comparatively large circumferential area of ​​the main former 101. The thread 10 rests on the main former 101.

[0248] Via the preformer 102, which in this embodiment is located upstream of the paper production process, an additional, thin paper web 100a without features is fed to the main former 101, where it is combined with the paper web produced at the main former 101 and the thread 10 to form a combined paper web 100. As a result, the thread 10 is arranged between the two paper layers of the paper web 100. In this embodiment, it is advantageous if the inlet tension of the incoming thread 10 is sufficiently large so that the thread 10 rests sufficiently firmly on the paper screen 101. This advantageously prevents the resting thread 10 from being flushed into the window areas. As a result, these areas of the thread 10 can later be exposed. The paper substrate is removed from the combined paper web 100 with the thread 10 integrated therein via the couch roller 103.In an alternative embodiment of paper production without a preformer 102, the yarn inlet is also as shown here.

[0249] Fig. 16 shows a schematic drawing of a second variant of the paper path and thread path on paper screens. In the second variant, the thread 10 runs in from above at the main former 101 from the side of the preformer 102. This results in only a short loop or support of the thread 10 on the main former 101. This results in largely free window forming on the main former 101. The thread 10 lies here in particular on the paper of the paper web scooped in the main former 101. An additional, thin paper web 100a is fed to the main former 101 via the preformer 102 upstream in paper production, where it is combined with the paper web produced at the main former 101 and the thread 10 to form the combined paper web 100. The thread 10 is thus arranged between the two paper layers of the paper web 100.The paper substrate is removed from the combined paper web 100 with the thread 10 integrated therein via the couch roller 103.

[0250] Fig. 17 shows a schematic drawing of a paper machine for the first variant from Fig. 15.

[0251] The thread 10 runs from the thread spool 10a via a measuring unit 110, various deflection rollers, a tensioning mechanism 120, and a sensor roller (not shown) onto the paper screen 101 forming the main former. The sensor roller belongs to a measuring unit 113 for the thread tension. The tensioning mechanism 120 regulates the thread tension and, depending on this, the elongation of the thread, which can be measured via the measuring unit 113. The tensioning mechanism 120 is controlled via an electronic control system 130 by the signals from the first sensor 111 related to the thread and the second sensor 104 related to the paper screen 101. The first sensor 111 related to the thread detects the register marks of the thread 10. The second sensor 104 related to the paper screen 101 detects position features on the paper screen 101.The signal of the second sensor 104 related to the paper screen 101 can originate from the paper web 100 itself and / or from one or more sensors arranged downstream of the paper screen 101 further along the paper web 100 instead of from the paper screen 101.

[0252] The second sensor 104 related to the paper screen detects position features directly on the paper screen 101 and elements arranged there and firmly connected to the paper screen 101 for generating the windows and / or watermarks in the paper web 100 and transmits these signals to the electronic controller 130. Preferably, the second sensor 104 related to the paper screen is arranged on the circumference of the paper screen 101.

[0253] An optional third sensor 105 is arranged downstream of the paper screen 101 on the paper web 100 and, in one embodiment, represents an alternative to the second sensor 104 related to the paper screen. This is advantageous because the paper screen 101 and the elements connected thereto for generating the windows and / or watermarks in the paper web 100 may have positional tolerances that arise during the manufacture of the paper screen 101 and / or during production due to

[0254] Temperature fluctuations and / or due to aging or wear on the paper screen 101.

[0255] In a further embodiment, the optional third sensor 105 can also be provided downstream of the paper screen 101 on the paper web 100 in addition to the second sensor 104 related to the paper screen. This can be provided, in particular, for closed-loop control by comparing the actual values ​​on the paper web 100 downstream of the paper screen 101 with the signals from the sensors arranged on or upstream of the paper screen 101 in the electronic control system 130, i.e., with the signals from the second sensor 104 related to the paper screen and the signals from the first sensor 111 related to the thread. The third sensor 105 detects, in particular, the signals of a window and / or a watermark in the paper web 100.Furthermore, a further optional fourth sensor 106 is also provided downstream of the paper screen 101 on the paper substrate, which detects the position of the thread 10 in the paper web 100. In the electronic control 130, the signals of the third 105 and fourth sensors 106 are then compared with the signals of the first 111 and second sensors 104, and if there are any deviations in the signals, the thread tension or the stretch of the thread is adjusted if necessary.

[0256] Downstream of the paper screen 101, at least one drying device 140 is arranged, in which the paper substrate with the now embedded thread 10 is dried. During this drying process, the paper substrate shrinks in length and width while the paper substrate is dried to a desired residual moisture content.

[0257] It is advantageous if the paper substrate with the embedded thread 10 is stretched, particularly during drying, to counteract shrinkage somewhat and, in particular, to allow the shrinkage process to proceed in a more controlled manner by applying a force to the paper substrate in the feed direction. Such a stretch of the paper substrate with the embedded thread 10 can be, for example, 0.5% to 5%, preferably 1% to 3%.

[0258] Due to the changes in the paper substrate during drying, it may also be advantageous to arrange the third 105 and fourth sensors 106 downstream of the drying device 140. It is possible to arrange the third 105 and fourth sensors 106 upstream of the drying device 140 and / or downstream of the drying device 140.

[0259] A marking device 141 (see above) is preferably arranged downstream of the drying device 140 to apply and / or introduce any desired markings onto the dried paper substrate. Using the signals detected by the sensors, the register marks of the thread 10 are brought into alignment or synchronization with the register marks on the paper screen 101, including a tolerance range. To bring the thread 10 into register, for example, during the start-up phase or during a roll change, higher tensile forces and thus greater thread elongation are required than during operation when the register is "stuck."

[0260] With this solution, it is particularly preferred if the splicing, i.e., the attachment of a new thread to the end of a previously used thread, takes place in register or "close to register." This has the advantage that the register to the paper screen is maintained within the desired tolerance or can be quickly restored to the desired tolerance.

[0261] A further fifth sensor 112 related to the thread can be arranged upstream of the splicing device. The further fifth sensor 112 related to the thread records the register mark of the thread used upstream of the splicing device 150. The further fifth sensor 112 related to the thread can be provided as an alternative to the first sensor 111 related to the thread or in addition to the first sensor 111 related to the thread. The first sensor 111 related to the thread is preferably arranged downstream of the splicing device 150. The further fifth sensor 112 related to the thread can assist splicing near the register.

[0262] In a preferred embodiment, two sensors are provided for detecting the register marks 12 of the thread 10. The fifth sensor 112, located upstream of the splicing device 150, detects the register mark in the unwinding (lower) thread. This can assist splicing close to the register. The first sensor 111, related to the thread, is located downstream of the splicing device 150 and serves to adjust the stretch of the thread 10 in order to establish or maintain registration with the paper web 100.

[0263] Fig. 18 shows a schematic drawing of a paper machine for the second variant from Fig. 16.

[0264] The thread 10 is therefore fed to the paper screen 101 on the same side as the paper web 100a coming from the preformer 102 (not shown) is fed to the paper screen 101 (main former).

[0265] Otherwise, Fig. 18 corresponds to Fig. 17. Reference is made to the explanations given for Fig. 17.

[0266] Without a correspondingly registered splicing process, i.e., joining a moving first thread to a second thread, the registered insertion of the thread into the paper web 100 or into the paper substrate would be lost with each thread roll change and would have to be completely reset. This would result in a high level of waste from paper substrates containing incorrectly positioned embedded threads. This waste is particularly relevant today because, for economic reasons, reducing waste is becoming increasingly important, and many central banks also demand very precise accounting of how many security elements and quantities of security paper must be destroyed as waste and how much remains as a useful substrate for security documents, especially banknotes.

[0267] During the start-up phase, for each track to be used, a thread 10, preferably a leader thread, is first injected into the paper pulp forming the paper web 100. The time it takes for each thread 10, preferably a leader thread, to engage the paper pulp and the paper screen, i.e., until it is reliably pulled along, varies slightly from track to track. In this process, the thread 10, preferably the leader thread, is "pulled into register" in each track. As soon as this occurs on all tracks, i.e., immediately after the end of the start-up phase, the threads 10 in all tracks are spliced ​​in register, i.e., connected to newly incoming thread spools. Preferably, the leader thread is connected to an original thread in each case.

[0268] The process often runs with 100 paper webs ranging from approximately 750 mm (1x superformat = 820 mm) to 3000 mm (4x superformat) in width, and with 5 or 6 tracks per "superformat" with blanks. Thus, up to 24 threads can run simultaneously into the same paper pulp. Additional, fully embedded threads can also run into the paper pulp.

[0269] To further reduce waste, it is particularly preferred to use an inlet material for the initial gripping of the thread in the paper pulp or on the paper screen. This inlet material is preferably provided as a separate roll material. In this case, the inlet material is referred to as the leader thread. Alternatively or additionally, the actual thread can contain the inlet material in a leader area.

[0270] The leader thread can be designed without register marks and / or without other functional and / or decorative features. In an alternative embodiment, the leader thread can have at least functional features, in particular in the form of register marks.

[0271] Preferably, the leader thread merely has a clearly recognizable pattern (for example, a label "Vorlaut / Preload" and / or a clearly recognizable pattern). Preferably, the leader thread has a surface that does not differ in its adhesion properties from those of the original thread. The original thread is understood to be the thread 10 used in normal operation. The original thread therefore includes, in particular, design features and / or security features and / or

[0272] Functional features such as register marks.

[0273] As the leader thread runs into the paper pulp forming the paper web 100 or the paper substrate, an initial anchoring of the respective leader thread is created on all tracks in the paper substrate, but without register with respect to the windows in the paper substrate. This anchoring phase can last for a different length for each track, in particular between 1 second and 600 seconds. It is therefore advantageous to use a leader thread on separate rolls as infeed material. The leader thread preferably has a length of between 50 m and 50,000 m on each track or on each roll, particularly preferably 500 m to 5,000 m. This initial anchoring phase takes place in particular when the paper machine is started up and / or during a job change or in situations in which the continuous process flow is disrupted to such an extent that a restart of the process is necessary. During the restart, the thread is anchored into the paper web 100 orThe paper pulp forming the paper substrate is injected and the register is readjusted.

[0274] In an alternative embodiment, the leader thread can have register marks which can be detected by a sensor, preferably by the first sensor, during and / or before and / or after the leader thread is gripped in the paper pulp and converted into sensor signals. These sensor signals can be used to set a register, i.e. a positional accuracy between the leader thread and the paper web. This has the advantage that not only during the anchoring phase, but also during the positioning phase, i.e. during the initial adjustment of a register between the thread and the paper web, not the original thread with security features is used up, but rather the leader thread, which results in less waste that is sensitive from a security point of view. If the original thread is then joined to the leader thread, a register between the paper web and the thread is already created.The register marks can also be suitable for sensory detection of the front and / or back of the thread and thus its position.

[0275] As soon as all tracks have engaged and in particular the register between the leader thread and the paper web has been reached, an original thread is spliced ​​close to the register of the leader thread in all tracks at the same time or at different times and then the register between the thread and the windows in the paper substrate is adjusted using the original thread.

[0276] The leader thread can be arranged on a roll with a very long running length so that this roll can be reused several times for several anchoring phases.

[0277] Alternatively or additionally, to further reduce waste, it is preferred for each thread spool to have a preload area. This preload area has no security-relevant features, but merely register marks and / or other functional and / or decorative features. For example, the preload area has a "Vorlauf / Preload" label and / or a clearly recognizable pattern. Preferably, the preload area has a surface whose adhesion properties do not differ from those of the original thread. The preload area is preferably between 100 m and 1500 m long, particularly preferably between 200 m and 1000 m long.

[0278] As the leader section runs into the paper substrate, the register is established with the help of the register marks in the leader section so that when the end of the leader section is reached, the register between the thread and the paper screen is within the desired tolerance and there is very little or no waste when the thread with security features runs in. As the leader section runs into the paper substrate, the position of the thread in relation to the front and back of the thread relative to the paper substrate can also be adjusted, in particular to prevent and / or correct unwanted twisting of the thread. So that when the end of the leader section is reached, the position of the thread in relation to the front and back of the thread relative to the paper substrate is correct and there is very little or no waste when the thread with security features runs in.

[0279] It is preferred if the leader area has optical and / or magnetic and / or other features by which the paper substrate with embedded leader area can be easily detected and sorted out.

[0280] The paper substrate produced in this start-up phase, which represents rejects, then preferably only contains infeed material (i.e. leader thread or leader area) and can be easily detected and selected, particularly by sensory means, via its marking or via its other optical or functional appearance or behavior.

[0281] For particularly good detectability of rejects, it is further advantageous if a marking device is provided in the conveying path of the paper substrate downstream of the paper screen and more preferably downstream of the dryer device. This marking device is controlled by the electronic control system in such a way that an optically detectable mark is generated on the paper substrate when there is insufficiently precise registration between the thread and the paper substrate and / or during the start-up phase with inlet material embedded in the paper substrate. The marking device can preferably be an inkjet print head or another electronically controllable printing module for dispensing optically and / or electrically detectable substances onto the paper substrate.

[0282] Due to the comparatively large width of the moist or wet paper web 100 on the paper screen and further downstream of the paper screen, edge regions of the paper web 100 are drier and thus shorter than the paper web regions located between the edges. These edge regions therefore shrink less during the subsequent drying process. Preferably, the tensile force exerted on the relevant threads in these edge regions is adjusted accordingly when adjusting the register between thread 10 and paper web 100. For example, an offset value for the tensile force can be stored in the control system for these edge regions.

[0283] It is clear to the person skilled in the art that the above-mentioned embodiments of the devices, equipment, methods or method steps can be combined with one another as desired and do not represent any limitation, particularly in their design and combination.

[0284]

[0285] 1 sheet, printing sheet

[0286] 1 a Sheet length on the paper web

[0287] 2 Gripper edge of the sheet

[0288] 3 Posterior edge of the arch

[0289] 4 individual benefits

[0290] 5 Rapport gap

[0291] 6 watermarks

[0292] 7 Banknote area

[0293] 8 banknotes

[0294] 8a upper edge of the note

[0295] 8b lower edge of note

[0296] 9 windows

[0297] 9a footbridge

[0298] 9b maximum possible area for bridge

[0299] 10 threads

[0300] 10a Thread spool

[0301] 10b first thread

[0302] 10c second thread

[0303] 11 Thread design area

[0304] 11a Length of the design area in the direction of travel

[0305] 12 Register mark

[0306] L Running direction

[0307] RF repeat length of the thread

[0308] RP Repeat length of the paper web

[0309] 20 Thread connecting device

[0310] 21 Supporting structure

[0311] 22 funding path 24 path

[0312] 26 Guide device

[0313] 27 Wetting device

[0314] 28 Cutting device

[0315] 29 Guide device

[0316] 30 guidance device

[0317] 31 Guide device

[0318] 32 clamping device

[0319] 33 Association facility

[0320] 34 Holding device

[0321] 39 Wetting

[0322] 41 Clamping and cutting device

[0323] 46 Actuator

[0324] 50 control levers

[0325] 52 Leadership role

[0326] 53 Leadership role

[0327] 54 pulley

[0328] 59 Association role

[0329] 60 process steps

[0330] 61 Conveyor movement

[0331] 62 process steps

[0332] 63 Process step

[0333] 64 Initial section

[0334] 65 process steps

[0335] 66 process steps

[0336] 67 Process step

[0337] 68 process steps

[0338] 69 Process step

[0339] 70 work area

[0340] 71 process step

[0341] 72 Process step 73 Liquid

[0342] 74 Process step

[0343] 75 Swivel direction

[0344] 76 process steps

[0345] 77 Process step

[0346] 78 final section

[0347] 79 band strand

[0348] 80 process steps

[0349] 81 remaining end

[0350] 82 Process step

[0351] 83 connecting section

[0352] 84 Process step

[0353] 85 Conveyor movement

[0354] 90 pneumatic actuator

[0355] 91 Swivel lever

[0356] 95 clamping device

[0357] A image motif in the window after embedding,

[0358] Z Image motif in the window before embedding

[0359] X length factor

[0360] B Position tolerance for the image motif,

[0361] C1 , C2 window edge blur

[0362] D nominal window size

[0363] S area of ​​the thread under the bridge 9a

[0364] B' area formed from B, S and again B

[0365] 100 paper webs

[0366] 100a Paper web of the preformer

[0367] 101 mainformers

[0368] 102 preformers (shortformers)

[0369] 103 Suction couch roll 104 Second sensor

[0370] 105 third sensor

[0371] 106 fourth sensor

[0372] 110 Measuring unit 111 First sensor

[0373] 112 fifth sensor

[0374] 113 Measuring unit thread tension

[0375] 120 traction mechanism

[0376] 130 electronic control 140 dryer device

[0377] 141 Marking device

[0378] 150 splicing device

Claims

Patent claims 1. A method for conveying a thread strand, in particular an endless thread strand, wherein at least one moving first thread (10b) and a second thread (10c) are connected to produce the thread strand, wherein an end section of the first thread entrains an initial section of the second thread, characterized in that the first (10b) and the second thread (10c) each have a repeatedly repeated sequence of features, wherein the two threads (10b, 10c) are arranged in register with each other, wherein the method comprises the following steps, in particular in the following order: a) detecting the register position of at least the first thread (10b) by means of a sensor, preferably by means of a first sensor (111), b) bringing the second thread (10c), which is held, in particular held or braked, by a holding device (34), into contact with the first thread (10b),c) generating a control signal for releasing the holding device (34) on the basis of the register position of at least the first thread (10b) detected by the sensor, preferably by the first sensor (111), such that the register position of the first thread (10b) and the register position of the second thread (10c) are brought into precise positional agreement when the second thread (10c) is carried along by the first thread (10b).

2. Method according to claim 1, characterized in that the method comprises the following additional step, wherein the additional step is preferably carried out after step c): d) cutting the first thread (10b).

3. Method according to claim 1 or 2, characterized in that the second thread (10c), preferably with a known position of the features along the longitudinal extent of the second thread (10c), is initially at rest and is only set in motion due to the entrainment by the first thread (10b) after the release of the holding device (34) taking place in step c).

4. Method according to one of the preceding claims, characterized in that two sensors are provided for detecting the register position, preferably for detecting the register marks (12), of the first thread (10b), wherein the sensor, preferably the first sensor (111), is preferably arranged after the holding device (34) and a further sensor, preferably a fifth sensor (112), is preferably arranged in front of the holding device (34).

5. Method according to one of the preceding claims, characterized in that before or during or after the second thread (10c) is brought into contact with the first thread (10b), a connecting medium is applied to the first and / or second thread (10c), and in that the second thread (10c) is carried along by the first thread (10b) by an adhesion of the second thread (10c) to the first thread (10b) caused by the connecting medium, wherein the connecting medium is preferably a liquid.

6. A method for synchronizing a thread strand with a paper web (100) to be produced in a paper machine, wherein the paper web (100) comprises a multiply repeated sequence of first features, characterized in that the thread strand has at least one leader thread and one original thread, wherein the original thread comprises a multiply repeated sequence of second features, wherein a second repeat length of the original thread is shorter than a first repeat length of the paper web (100), wherein the method comprises the following steps, in particular in the following order: a) applying a pulp to a paper screen to produce the paper web (100), b) introducing and / or shooting the leader thread into the pulp applied to the paper screen, so that the leader thread is connected to the paper web (100) after at least partial drying of the pulp, wherein the paper web (100) and / or pulp at least partially encloses the leader thread,c) after the leader thread is conveyed from the paper web (100): bringing the original thread, which is held, in particular held or braked, by a holding device (34), into contact with the leader thread, d) detecting the register position of the paper web (100), e) generating a control signal for releasing the holding device (34) on the basis of the detected register position of the paper web (100), so that the original thread is carried along by the leader thread in such a way that the register position of the original thread and the register position of the paper web (100) are brought into line, wherein the original thread is connected to the paper web (100) after at least partial drying of the pulp, wherein the paper web (100) at least partially encloses the original thread, and f) cutting the leader thread.

7. The method according to claim 6, characterized in that the detection of the register position of the paper web (100) after step d) is carried out by means of a second sensor (104) detecting the paper screen, and / or by means of a third sensor (105) detecting the resulting paper web (100), and / or by means of a rotary encoder of the paper screen and / or by means of a rotary encoder of the paper screen drive, wherein the third sensor (105) detecting the resulting paper web (100) is arranged before or after drying, wherein the third sensor (105) detecting the resulting paper web (100) preferably detects the sequence of features of the paper web (100).

8. Method according to one of the preceding claims, characterized in that the leader thread has functional features, in particular in the form of register marks (12).

9. Method according to one of the preceding claims, characterized in that before or during or after bringing the original thread into contact with the leader thread, a connecting medium is applied to the leader thread and / or original thread, and that the entrainment of the original thread by the leader thread takes place by an adhesion of the original thread to the leader thread caused by the connecting medium, wherein the connecting medium is preferably a liquid.

10. Method according to one of the preceding claims, characterized in that a time period from the introduction and / or shooting of the leader thread according to step b) until the generation of a control signal for releasing the Holding device (34) according to step e) is between 1 s and 600 s, preferably 10 s to 300 s, particularly preferably 30 s to 60 s.

11. A method for synchronizing a thread (10) with a paper web (100) to be produced in a paper machine, wherein the paper web (100) comprises a multiply repeated sequence of first features, characterized in that the thread (10) comprises a multiply repeated sequence of second features, wherein a second repeat length of the thread (10) is shorter than a first repeat length of the paper web (100), wherein the method comprises the following steps, in particular in the following order: a) applying a pulp to a paper screen to produce the paper web (100), b) introducing and / or shooting the thread (10) into the pulp applied to the paper screen, so that the thread (10) is connected to the paper web (100) after at least partial drying of the pulp, wherein the paper web (100) at least partially encloses the thread (10), c) detecting the register position of the paper web (100),d) detecting the register position of the thread (10) by means of a sensor, preferably by means of a first sensor (111), e) generating a control signal on the basis of the detected register position of the paper web (100) and on the basis of the register position of the thread (10) detected by means of the sensor, preferably by means of the first sensor (111), so that the thread (10) is stretched on the basis of the control signal in such a way that the register position of the thread (10) and the register position of the paper web (100) are brought into agreement, wherein the method preferably comprises the method according to any one of claims 1 to 5 and / or the method according to any one of claims 6 to 10.

12. Method according to one of the preceding claims, characterized in that the detection of the register position of the paper web (100) after step c) takes place by means of a second sensor (104) detecting the paper screen, and / or by means of a third sensor (105) detecting the resulting paper web (100), and / or by means of a rotary encoder of the paper screen and / or by means of a rotary encoder of the paper screen drive, wherein the third sensor (105) detecting the resulting paper web (100) is arranged before or after drying, wherein the third sensor (105) detecting the resulting paper web (100) preferably detects the sequence of features of the paper web (100).

13. Method according to one of the preceding claims, characterized in that the features are design features and / or functional features.

14. Method according to one of the preceding claims, characterized in that the features are visible or machine-readable.

15. Method according to one of the preceding claims, characterized in that the thread (10) and / or the first thread (10b) and / or the second thread (10c) and / or the leader thread and / or the original thread have a width of 1 mm to 25 mm, preferably 2 mm to 15 mm, particularly preferably 3 mm to 10 mm.

16. Method according to one of the preceding claims, characterized in that the thread (10) and / or the first thread (10b) and / or the second thread (10c) and / or the leader thread and / or the original thread have a thickness of 6 pm to 75 pm, preferably 15 pm to 50 pm, particularly preferably 20 pm to 40 pm.

17. Method according to one of the preceding claims, characterized in that the thread (10) and / or the first thread (10b) and / or the second thread (10c) and / or the leader thread and / or the original thread have an E-modulus in the range of 2500 N / mm 2 up to 5000 N / mm 2 , preferably in the range of 3000 N / mm 2up to 4500 N / mm 2 , have.

18. Method according to one of the preceding claims, characterized in that a tensile force in the range from 10 cN to 1000 cN, preferably in the range from 100 cN to 800 cN, particularly preferably in the range from 150 cN to 600 cN, is exerted on the thread (10), the first thread (10b), the second thread (10c), the leader thread and / or the original thread, and / or that a tensile force in the range from 10 cN to 500 cN, preferably in the range from 20 cN to 300 cN, particularly preferably in the range from 30 cN to 100 cN, is exerted on the thread (10), the first thread (10b), the second thread (10c), the leader thread and / or the original thread.

19. Method according to one of the preceding claims, characterized in that a thread is conveyed to the paper web (100) in several tracks and is introduced into the paper web (100) in precise register.

20. Device for carrying out a method for conveying a thread strand, in particular an endless thread strand, preferably for carrying out a method according to claim 1, wherein at least one moving first thread (10b) and a second thread (10c) are connected to produce the thread strand, characterized in that the first (10b) and the second thread (10c) each comprise a repeatedly repeated sequence of features, that the device comprises at least one sensor, preferably at least one first sensor (111), for detecting the register position of at least the first thread (10b), a thread connecting device (20) for connecting the first thread and the second thread, and a control unit for generating a control signal based on the register position detected by means of the sensor, preferably by means of the first sensor (111),wherein the register position of the first thread (10b) and the register position of the second thread (10c) are brought into agreement upon joining the first thread (10b) and the second thread (10c) on the basis of the control signal. 21 . Device according to claim 20, characterized in that the thread connecting device (20) comprises a holding device (34) for holding the second thread (10c), preferably for holding the second thread (10c) with a known position of the features along the longitudinal extent of the second thread (10c), and / or a device for bringing the second thread (10c) into contact with the first thread (10b).

22. Device for carrying out a method for synchronizing a thread strand with a paper web (100), preferably for Carrying out a method according to claim 6, wherein the paper web (100) comprises a multiply repeated sequence of first features, characterized in that the thread strand has at least one leader thread and one original thread, wherein the original thread comprises a multiply repeated sequence of second features, wherein a second repeat length of the original thread is shorter than a first repeat length of the paper web (100), that the device comprises a paper machine with a paper screen for discharging a pulp to produce the paper web (100) and a device for detecting the register position of the paper web (100), that the device comprises a device for introducing and / or shooting the leader thread into the pulp discharged onto the paper screen, so that the leader thread is connected to the paper web (100) after at least partial drying of the pulp, wherein the paper web (100) at least partially encloses the leader thread,and that the device comprises a thread connecting device (20) for connecting the leader thread and the original thread and a control unit for generating a control signal based on the detected register position of the paper web (100), wherein the original thread is carried along by the leader thread and stretched in such a way that the register position of the original thread and the register position of the paper web (100) are brought into line, wherein the original thread is connected to the paper web (100) after at least partial drying of the pulp, wherein the paper web (100) at least partially encloses the original thread.

23. Device according to claim 22, characterized in that the thread connecting device (20) comprises a holding device (34) for holding the original thread, preferably for holding the original thread with a known position of the features along the longitudinal extent of the original thread, and / or a device for bringing the original thread into contact with the leader thread.

24. Device according to claim 22 or 23, characterized in that a second repeat length of the original thread is shorter than a first repeat length of the paper web (100), wherein the second repeat length of the original thread is preferably 0.1% to 10%, preferably 0.1% to 5%, more preferably 0.2% to 3%, particularly preferably 0.3% to 1% shorter than a first repeat length of the paper web (100).

25. A device for carrying out a method for synchronizing a thread (10) with a paper web (100), preferably for carrying out a method according to claim 11, wherein the paper web (100) comprises a multiply repeated sequence of first features, characterized in that the thread comprises a multiply repeated sequence of second features, wherein a second repeat length of the thread (10) is shorter than a first repeat length of the paper web (100), that the device comprises a paper machine with a paper screen for discharging a pulp to produce the paper web (100) and a device for detecting the register position of the paper web (100), that the device comprises a device for introducing and / or shooting the thread into the pulp discharged onto the paper screen, so that the thread (10) is connected to the paper web (100) after at least partial drying of the pulp,wherein the paper web (100) at least partially encloses the thread, and that the device comprises a sensor, preferably a first sensor (111), for detecting the register position of the thread (10) and a control unit for generating a control signal on the basis of the detected register position of the paper web (100) and on the basis of the by means of the, Sensor, preferably by means of the first sensor (111), detected register position of the thread (10), wherein the thread (10) is stretched on the basis of the control signal such that the register position of the thread (10) and the register position of the paper web (100) are brought into agreement.

26. Device according to claim 25, characterized in that a second repeat length of the thread (10) is shorter than a first repeat length of the paper web (100), wherein the second repeat length of the Thread (10) is preferably 0.1% to 10%, preferably 0.1% to 5%, more preferably 0.2% to 3%, particularly preferably 0.3% to 1% shorter than a first repeat length of the paper web (100).

Images