DE102008027186A1 - Feed strip e.g. threading strip, forming method for web material manufacturing machine, involves supplying protecting strip in one position from wastage treatment system as residual web by rotary machine elements of manufacturing machine - Google Patents

Abstract

The method involves producing a web material and forming a protecting strip (18) between a feed strip (14) e.g. threading strip, and a residual web (16). The protecting strip in one position is supplied from a wastage treatment system as the residual web by rotary machine elements (70) of a web material manufacturing machine. A drier section is provided with a drying system in the web material manufacturing machine. Independent claims are also included for the following: (1) a method for feeding a web into a web material manufacturing machine (2) a system for forming a feed strip in a web material manufacturing machine.

Description

object This invention is a method of forming a leader strip in a web-making machine with scrap processing, wherein in the web-making machine a material web is produced, from which a leader strip (threading strip), a residual track (reject strip) and between these a separation, d. H. Protective strips are formed.

It also concerns the invention provides a system for forming a leader strip in a web forming machine and lead a process when Bahnauf in a web-making machine as well as a lace cutter.

from Prior art her known numerous methods for education and for transporting the performance strip. In these methods, the leader strip is removed from the web separated, and the rest Remaining part of the train, the residual train, goes to the committee.

in the typical case, the mutual separation takes place in the committee walking residual track and the performance strip by blower, for example by lifting the edge with the help of a blast air flow. Specifically, on the edge of the residual track is to the residual track from the leader strip to to solve, directed a stream of air.

The Problem is that the residual web, d. H. so the rejects, and the performance strip do not always solve each other. Reinforced this problem especially before the first dryer group where the web still has a very high water content, in appearance. This takes place not complete Separation of the cut thread strip from the residual train. In other words, if their paths separate, it comes either on the Aufführstreifen or at the residual web to frazzle / plucking, which is a tearing of the paper tail while of the track performing can effect. issues can even when spreading the Aufstripes occur, with the residual web may get out of control.

Increase of Pressure of the water cutting jet improves the cutting result, However, due to the increased amount of water, the moisture content of the Edge of the cut Aufführstreifens increased. The Moisture causes swelling of the web strip forming the leader strip, what to marginal distortions and continue to tear the paper tail leads. The problem is experienced So even a partial tightening, when the cutting water pressure of separating the Aufführstreifens serving tip cutter is increased. As indicated above, increasing the water pressure typically increases also the amount of water, wherein the formed from the web residual web and especially the performance strip even stronger soggy be known and learns yes, the strength of the Aufführstreifens another weakening.

On the Aufführstreifenseitigen Edge of the residual track can be solved of the performance strip be directed from the residual web an airflow. However, that leads to new problems, the most significant of which is that the Restrail possibly on top of each other folded into the dryer section. Also, the Aufführstreifen can detach from the sieve and then cause problems by sticking to a cylinder. In addition, grows the widening of the web poses the risk of the residual web out of control device. In other words, if the residual track with spreading the Aufführstreifens narrower to full width As a result of the blown air effect, it may cause the tear to burst ever narrower expectant residual web come.

The Problems occur especially when widening, if the lace cutters are in motion and the cut quality is worse is considered stationary Tailor. As a result of movement of lace trimmers the cut can even Have interruptions.

you has to solve this problem Tried by placing between the leader strip and the residual web a separation, d. H. Protective strip has formed, the feed strip should protect. The protective strip also does this to a modest degree, because Part of the tears caused by the remainder stick to this protective strip. However, the protective strip and the residual web from the same cylinder fed from the scrap treatment. there Many problems associated with the residual web become over the protective strip transferred to the Aufführstreifen.

At the Cutting in the press section also causes the problem that the different parts of the web when they are side by side through the press nip be glued together, stick together. It can be so in the Nip to stick together, which leads to problems.

Of the The present invention is based on the object, a novel Method of forming the tread strip in a web-making machine.

The characterizing features of this method according to the invention are that the protective strip is fed from a different location from the scrap treatment than the rest train.

at In this process, the residual web and the protective strip are separated from each other separated, thereby guiding of the performance strip and anyway the entire track show with higher Probability as far as possible.

With The invention is also a novel method in conjunction with the track show be created in a web-making machine.

The characterizing features of this method according to the invention are that, while the performance strip is transported further, the protective strip from another location from as the residual web of the waste treatment is supplied.

Further to the invention a novel system for forming the Aufführstreifens be created in a web-making machine.

The characterizing features of this system according to the invention are that the system as well Devices for removing of the protective strip in the waste treatment, and that these said devices are located elsewhere as the devices for discharging the residual track into the reject treatment.

With the said system the track perform improve, since that of the rest of the strip on Aufführstreifen caused fraying / plucking reduced.

Further The invention is based on the object, a novel tip cutter provide.

The Characteristics of this invention lace cutter exist in that the tip cutter also has means for discharging the Protective strip in the waste treatment without damaging the paper tail includes.

With The said lace cutter becomes a more intact, d. H. clean cut thread strip achieved as with the lace cutters of the prior art.

in the In connection with the inventive method for forming a Performance strip in A web-forming machine is under web-forming machine a machine for the production of paper or cardboard understand. The formation of the performance strip takes place in the material web-making machine for example, when transferring the Material web from the press section in the dryer section or from a drying section in another dryer section. A performance strip is also when transferring the Railway formed in the end group. The endgroup can be, for example pre-smoothing, Size pressing, brushing and / or calendering. The education a performance strip is necessary, because the transfer of the full width material web from one machine section to the other would become make it difficult. For threading, d. H. List the web are made of the material web a leader strip, a reject, d. H. Restrail and a protective strip between them educated. More precisely, the Aufführstreifen, the Restbahn and the protective strip is made by dividing the web in the transverse direction the web / machine made. The web-forming machine further has apparatuses for Shot treatment. Also, the protective strip of the scrap treatment fed from a different location than the residual track. With others In other words, the protective strip is in a different place than the Restrail deflected out of the way of the Aufführstreifens. there the protective strip separates the leader strip and the residual web indeed from each other, because the Ausfrans- / Rupferscheinungen occurring on the residual web now have no effect on the Aufführstreifen. The introduction of the protective strip into the reject treatment, for example a Pulper, now under better control than before, since this Inserting from a different location than the introduction of the residual web happens. The distance between the points from which the protective strip or the residual web of the waste treatment is supplied, can be very low be; It is essential that the protective strip and the residual web are different in time out of the way of the Aufführstreifens be deflected. In this case, therefore, the lowering of the residual web takes place completely in the junk handling separated from the strip. Furthermore receives you have such a Aufführstreifen with two absolutely straight, smooth edges, so that tears and folding over this Strip be avoided.

In one of the embodiments, the protective strip is guided from its position between the leader strip and the residual strip into the scrap treatment, ie the protective strip is deflected out of its position between the leader strip and the residual strip. The web is thus cut into three strips, namely a residual web, a protective strip and a leader strip, and said strips run side by side until one of them, for example the protective strip, is deflected and discharged into the reject treatment. If the protective strip is deflected out of its position between the leader strip and the residual strip, this is done on ers place. In other words, the protective tape is fed to the waste web before the scrap treatment. Between the residual web and the Aufführstreifen so a free, webless gap is present when the residual web of the waste treatment supplied, that is deflected out of the path of the Aufführstreifens. This is particularly advantageous if the Aufführstreifen-, residual web and protective tape formation takes place before the first press nip or between the press nips. The free space between the leader strip and the residual web prevents the press from sticking together in the press.

at another embodiment the web-making machine has rotating machine elements, and the residual web is made by a rotating machine element, for example, a steam-heated cylinder, the reject treatment fed. Furthermore the protective strip is in front of said rotating machine element, from which the residual web of the waste treatment is supplied, directed to the committee treatment. This separates the rotating Machine element that point where the protective strip into the scrap handling guided will, from the point where the residual pathway in the scrap treatment guided becomes.

at a third embodiment the web-making machine has a dryer section with Drying devices (drying elements) as rotating machine elements. Furthermore the formation of the performance strip takes place, the residual web and the protective strip before the first drying device. The use of the process prior to that taking place in the dryer section Drying is advantageous, because at low dry content it easily comes to a clinging of the cut from the web Components. In the following, the abbreviation TG is used in this text for the dry content used. The clinging of residual web and Aufführstreifen leads to significant problems. Low TG limits the amount of cutting water to be used, which has a negative effect on the cutting result. The procedure according to this embodiment allows a reduction in the amount of water to be used for cutting. Thereby has the performance strip, especially its residual orbit side, a higher TG than before. Essential is that the main problem before drying in the dryer section in the low strength of the Aufführstreifens, due to low TG, persists. One cut from a low TG train feed strip tends to break, so that the loads acting on him must be minimized.

in the The invention will now be described with reference to the attached, some embodiments The drawings showing the invention are described in detail. Show it:

1 an inventive system for forming the Aufführstreifens, viewed from above the web forming machine;

2 another system according to the invention for forming the Aufführstreifens, viewed from above the web-forming machine;

3 a third inventive system for forming the Aufführstreifens, viewed from above the web forming machine;

4 an inventive system for forming the Aufführstreifens, viewed laterally from the web-forming machine;

5 another system according to the invention for forming the Aufführstreifens, viewed laterally from the web-forming machine;

6 a press concept with central roll, in which the inventive method is used.

1 shows a system according to the invention 12 to form a performance strip 14 in a web-making machine. The system 12 has rotating machine elements 70 , Medium 22 for the formation of the performance strip 14 as well as funds 24 for the formation of the protective strip 18 and the rest of the train 16 , With the means 22 . 24 are formed from the material web of the Aufführstreifen, the protective strip and the residual web. More specifically, with the formation of the performance strip 14 serving resources 22 the performance strip 14 from the train 20 separated. Further, with the serving for the formation of the protective strip and the residual web means 24 from the remaining part 17 the train 20 the protective strip and the residual web cut. The protective strip 18 is between the performance strip 14 and the rest of the train 16 educated. Furthermore, the system includes devices 52 for transferring the residual web 16 in the reject treatment. The reject treatment can be carried out in a conventional pulper, but the term "reject treatment" is to be understood here in its broad meaning as treatment / treatment of the parts to be diverted 12 devices 44 with which the protective strip 18 from another point of the committee treatment is fed as the residual train 16 that with the devices 52 the reject treatment is supplied. The protective tape should be routed to the reject treatment so that the edges of the tape are not damaged. The further transporting of the formed Aufführstreifens can be supported by ropes, by Blasluftströme, by Einsiebführung or by Vaku guided conveyor belt.

In the in 1 The system shown is the running direction of the material web 20 through the arrow 26 specified. The web-forming machine includes rotating machine elements 70 , and in the process, the residual web 16 from the rotating machine element 70 ' supplied from the scrap treatment.

Behind the rotating machine element, from which the residual web in the Then the protective strip is passed supplied to the waste treatment become. The residual web can be fed to the reject treatment, d. H. from the protective strip and Aufführstreifen be steered away while the protective strip and the leader strip continue their journey together. Thereafter, the protective strip for Example by a vacuum-loaded conveyor belt from his joint Running track with the Aufführstreifen deflected. Is the deflection of the protective strip with a vacuum-loaded conveyor belt, so the fraying / plucking effect of the rest of the track at the Aufführstreifen remain and anyway the mutual interactions between residual web and Aufführstreifen very low. Even if the width of the protective strip in Measure meters, this leaves For example, with a vacuum-powered conveyor belt still lead away economically.

2 shows another system according to the invention 12 for the formation of the performance strip 14 viewed from above the web forming machine. The system 12 includes a treadmill forming site in the machine direction 32 with funds 22 for the formation of the performance strip 14 , Further includes the system 12 in the machine direction, a protective tape forming station 34 with funds 24 for the formation of the residual web 16 and the protective strip 18 , The to the formation of the residual web 16 and the protective strip 18 serving place 34 is here also separated in the machine direction from the formation of the Aufführstreifens 14 serving place 32 , The residual train 16 and the protective strip 18 are formed first, followed by the formation of the Aufführstreifens 14 , For the production of the Aufführstreifens 14 is using the stripper manufacturing means 22 a strip of the material web 20 separated. Happens the production of the Aufführstreifens and the protective strip in this way in different positions, it is achieved because now the Aufführstreifenherstellung and the protective strip production vonein other separate operations, a total of a more stable realization of the whole. The forces acting on the material web at the same time are thus minimized.

In the in 2 The system shown is the running direction of the material web 20 through the arrow 26 specified. The web-forming machine includes rotating machine elements 70 , and in the process, the residual web 16 from the rotating machine element 70 ' supplied from the scrap treatment. The protective strip 18 is the scrap treatment in front of the rotating machine element 70 ' supplied, from which then the residual web 16 the committee treatment. The material web 20 is doing with the first roller 28 , the second roller 30 and the drying wire (not shown). The formation of the protective strip 18 and the rest of the train 16 takes place before the first roll 28 For example, between the nips of the presses or before the first nip. The formation of the performance strip 14 again happens between the first roller 28 and the second roller 30 , The protective strip 18 will be behind the first roller 28 but before the second roller 30 from his position between the leader strip 14 and the rest of the train 16 deflected. So after the protective strip 18 his position between Aufführstreifen 14 and residual track 16 left the threading strip 14 and the residual track 16 her way to the second roller 30 continued.

From the second roller 30 The rest of the train will be out 16 discharged into the reject treatment, and only the Aufführstreifen 14 continues on its way together with the covering. The fabric is not shown in the drawing; However, it is located between the first roller and the material web. On the second roller, in turn, the clothing is on the material web. In a similar way, the string runs in 1 and 3 ,

3 shows a third system according to the invention 12 for the formation of the performance strip 14 viewed from above the web forming machine. In this system 12 the formation of the protective strip takes place 18 from the rest part 17 the material web. Before the first roll 28 , for example, between the nips or before the first nip, the Aufführstreifen 14 cut, being from the web 20 the rest part 17 remains. For this rest part 17 become the residual train 16 and the protective strip 18 educated. Is from the train 20 first directly the stripper 14 separated and then from the rest of the part 17 the train 20 the protective strip 18 so can both the stripper 14 as well as the protective strip 18 from the broad part of the railway 20 get cut.

At the in 3 shown system 12 has the protective strip 18 a width a of 20-500 mm, preferably 100-250 mm. In itself, a smaller width would be sufficient for the separation of the residual web from the leader strip, but if the protective strip has a width of over 20 mm, it may be out ner position between Aufführstreifen and residual track are deflected. Again, if the protective strip is less than 250mm wide, it can be controlled to reject treatment with known vacuum-assisted conveyor belt concepts that are proven to be reliable. Preferably, the protective strip has a width of 100-250 mm, which then makes the deflection of the protective strip from its position between the leader strip and residual web using existing technology easy and simple. In itself, the protective strip can be, for example, one meter wide and then also supplied to the waste treatment with a vacuum-activated conveyor belt. Even then, the residual web, so the majority of the web can be supplied with very simple means of the rotating machine element from the scrap treatment. The invention thus offers an advantage even with a broad protective strip.

The in 3 leader strip shown in connection with a single pass dryer section has a width b of 200-800 mm, preferably 400-600 mm. The leader strip must have sufficient strength to withstand the stresses placed on it. On the other hand, the threading strip must also be narrow enough so that it can easily be passed through the machine.

In the 3 represented means 22 for forming the Aufführstreifens consist of the cutting device 36 for separating the Aufführstreifens 14 ; the means 24 for the formation of the protective strip 18 and the rest of the train 16 in turn consist of the cutting device 38 for cutting the protective strip 18 and the rest of the train. The cutters typically consist of lace cutters, typically water jet or knife cutters. In addition, in the case of the typical concepts, the edge trimming of the web takes place at an earlier machine location, as a result of which it acquires a straight edge. So after cutting according to the invention, more generally forming the threading strip, both edges of the threading strip are trimmed and straight.

The method for feeding the material web in a web-forming machine can according to 3 be realized. The web-forming machine has rotating machine elements 70 , In the process, first the full width web 20 passed into the reject treatment, and this initiating happens from the rotating machine element 70 ' more precisely from the second roller 30 out. The rotating machine element, from which the web is fed to the pulper, may for example be a cylinder. After that, with the means 22 . 24 out of the train 20 the performance strip 14 , the residual track 16 and the protective strip 18 educated. The performance strip 14 is transported in the machine, while the residual track 16 and the protective strip 18 go into the junk treatment. Then the Aufführstreifen 14 traveled on production width. In addition, as the leader strip in the machine continues to run, the protective tape is peeled 18 from a different location than the remainder 16 supplied to the waste treatment. More specifically, the residual web of the rotating machine element 70 ' off and the protective strip in front of the machine element 70 ' discharged into the reject treatment.

In 2 becomes the performance strip 14 at a location other than the protective strip 18 educated. The system 12 includes control devices 40 , and to these control devices 40 turn belong to computing devices 42 to control the funds 22 with which the Aufführstreifen is formed, and the means 24 with which the protective strip 18 and to take account of the delay between these two measures. More generally, there can be talk of a set synchronization of the measures.

The systems in 1 to 3 are only over a partial width of the material web-making machine and the material web 20 shown. The "discontinuity" of the web in the transverse direction of the web-forming machine, ie the graphical omission of a portion of the web width, is indicated by a dashed-dotted line The width of the web-forming machine and the web 20 can range from a few meters to over ten meters. The invention can thus be applied to webs of very different widths. In 2 and 3 is also the "discontinuity" in the web longitudinal direction represented by corresponding dashed lines.

4 shows a system according to the invention 12 for the formation of the performance strip 14 viewed laterally from the web forming machine. The web-forming machine serves to produce the material web 20 and also has devices for scrap handling 74 , In this system will be out of the train 20 a performance strip 14 , a residual train 16 and a protective strip between them 18 educated. Since the system is shown laterally from the web-making machine, it is shown in FIG 4 not to recognize that the protective strip between the residual web and the Aufführstreifen is located. In addition, the protective strip 18 the reject treatment 74 fed from a different location than the residual track 16 ,

The protective strip 18 will, as in 4 shown from its position between Aufführstreifen 14 and residual track 16 for reject treatment 74 deflected out. The removal of the protective strip 18 in the reject treatment 74 takes place immediately after its formation with the means used to form the protective strip and the residual web 24 ,

The web-making machine has, as in 4 shown, rotating machine elements 70 , The removal of the residual web 16 in the reject treatment 74 takes place from the rotating machine element 70 ' out. The removal of the protective strip 18 in the reject treatment 74 again happens in front of the rotating machine element 70 ' from which the residual track 14 in the reject treatment 74 is directed. In addition, the protective strip 18 between two consecutive rotating machine elements 70 formed and fed to the waste treatment. In this case, the protective strip is supplied immediately after its formation of the reject treatment, so that it can not be stuck again on the leader.

Of the belonging to the web-making machine dryer section is in 4 a part shown. The dryer section comprises as rotating machine elements 70 drying devices 76 and rollers, of which in the drawing, the first guide roller 28 is shown. The performance strip 14 , the residual track 16 and the protective strip 18 be before the first drying device 76 ' educated. The said method is preferably applied before the first drying device, because the TG of the web is then low; it is typically less than 55%. Since the TG of the web is so low, the leader strip to be cut from the web has low strength. Therefore, the method of the present invention, which reduces the stresses on the leader strip, is well suited for the formation of the leader strip from a low TG web.

At the in 4 Shown embodiment, the residual web 16 from the first drying device 76 ' from the reject treatment 74 fed. In this case, the system according to the invention is used to guide the web in the first dryer group, where the tracking of the web is particularly delicate because of the low TG. There are many "fitting" locations for tearing the tread strip, for example, if the tread has discontinuity, ie weakness, due to fraying / plucking.

5 shows a system 12 for the formation of the performance strip 14 in a web-making machine. The system 12 includes rotating machine elements 70 , Medium 22 for the formation of the performance strip 14 , Medium 24 for the formation of the protective strip 18 and the rest of the train 16 , Devices 52 for removing the residual web 16 in the reject treatment 74 as well as devices 44 for removing the Schutzstrei fens 18 in the reject treatment 74 , The devices 44 for removing the protective strip 18 in the reject treatment 74 are at a different location than the devices 52 for removing the residual web 16 in the reject treatment 74 , The for removing the protective strip 18 in the reject treatment 74 serving devices 44 are in connection with the formation of the protective strip 18 and the rest of the train 16 serving resources 24 arranged. In this move, the Aufführstreifen is spread on production width, ie driven to full web width, the removal of the protective strip in the reject treatment devices 44 and the means for forming the protective tape and the residual web 24 simultaneously in the transverse direction of the web 20 , This system can be implemented with a smaller number of components than the system with which the removal of the protective strip 18 in the reject treatment 74 serving devices 44 and the means for forming the protective tape and the residual web 24 move apart from each other. An even more important advantage offered by the arrangement of the devices in the aforesaid manner in the same place as viewed in the machine direction is the simplicity of the synchronization of the functions. Namely, when the devices serving to discharge the protective strip into the scrap treatment and the means used to form the protective strip and the residual web are at different locations, synchronization must be established therebetween. However, the realization of this synchronization with the required accuracy is a demanding task, and the separate support beams for the two cutting devices also increase costs.

At the in 5 illustrated system 12 include the devices 44 for removing the protective strip 18 in the reject treatment 74 in the case of the embodiment shown, a case around the pulleys 48 running endless Auslenkband 46 , Furthermore, one of the devices used to remove the protective strip in the waste treatment belongs 44 next to the Auslenkband 46 also prefers also to pulleys 48 running guide band 50 , With the Leitband 50 becomes the protective strip 18 controlled by the deflection belt 46 directed towards waste management. Instead of the guide band, for example, a suction device, a pneumatic guide plate or any other Streifenleitvorrichtung can be used.

In conjunction with the Auslenkband, typically with the Leitband, vacuum is applied, the transfer of the protective strip on the tape is then carried out by vacuum action. The vacuum-loaded tape holds the protective strip safely under control. When implementing the deflection devices, it is thus possible to use a technique which has already proved its functionality during transport of the threading strip.

At the in 5 shown system 12 are those for removing the protective strip 18 in the reject treatment 74 serving devices 44 in the direction of the web 20 considered in time before the removal of the residual web 16 in the reject treatment 74 serving devices 52 , The deflection of the protective strip takes place 18 from his position between residual track 16 and performance strips 14 , The later initiation of the residual track 16 in the reject treatment is easy, since then the remaining track and Aufführstreifen are clearly separated. The residual web is scraper 78 from the rotating machine element 70 from which it is subjected to the treatment of waste. The scraper forms a mechanically very simple solution for lifting the residual web of the rotating machine element and for their forwarding to the reject treatment. In addition, the scraper has no influence on that part of the web that continues its path from the machine element (in the machine direction).

The to the in 5 shown system belonging means 22 for the formation of the performance strip 14 consist of the stripper cutting device 36 , The means 24 for the formation of the protective strip 18 and the rest of the train 16 turn consist of the protective strip and residual web cutting device 38 , The tail strip cutter 36 and the protective tape and residual web cutting device 38 are close to each other in the machine direction. They can also be arranged parallel to one another, ie viewed in the machine direction, at the same location. In 5 they are arranged closely behind one another for reasons of clarity. In itself, a small mutual distance of use, because then do not act multiple spray water jets on the same point considered in the machine direction. The cutting devices each have a cutting nozzle from which the cutting water jet emerges. With the said system become the Aufführstreifen 14 , the protective strip 18 and the residual track 16 cut. The release, ie deflection of the protective strip from its position between the cut Aufführstreifen 14 and the cut residual track 16 happens with the devices 44 for removing the protective strip 18 in the reject treatment 74 , The removal of the protective strip in the waste treatment is typically done with a vacuum-powered belt conveyor. Such a conveyor is, for example, the patent applicant's apparatus known under the trade name Press Force or Foil Force, which can be arranged at an angle to the web running direction, ie to the plane in which the web moves. In addition to or instead of the press force and foil force device, blower or water jet devices can be used to remove the protective strip in the reject treatment.

In the case of the system 5 become the devices used to remove the protective strip in the waste treatment 44 by a between the devices 44 and the cutting devices 36 . 38 extending connecting element 56 at the cutting devices 36 . 38 attached. The cutting devices 36 . 38 in turn are through the cutter connector 54 connected with each other. For example, the cutters may consist of lace cutters and may be attached to the same cross-machine direction carriage. Further, the serving for removing the protective strip in the waste treatment devices can be attached to the sliders carrying sliders. During production, the devices for removing the protective strip and the cutting devices are located laterally on the web-forming machine.

The for discharging the protective strip in the scrap handling device, typically a press force, even on the web, more precisely, abut the protective strip. She can, too at a distance of a few millimeters from the protective strip, if the vacuum effect caused with it is sufficient, the protective strip from the upper clothing from which it is transported to solve. is a small gap between protective strip and press-force device allows so the latter does not need a lifting device to contact it To bring protective strips. The "gusset" between the press-force device and the Material web helps to bring the protective strip to adhere and to steer down. Running the web at high speed, can generate the suction effect a pneumatic guide plate be used without a band concept.

With the system according to the invention to achieve a complete mutual release of Aufführstreifen- and the residual web edge. This eliminates the problems caused by their different paths. Typically, the removal of the residual web into the reject treatment occurs from a cylinder to which it is guided. The Aufführstreifen in turn continues its way along with the covering. In the prior art, at the point of separation, for example as a result of poor cutting, fraying / plucking occurs, in which case the residue-side edge of the threading strip is not straight. With the method according to the invention is achieved with Si ensure a straight trackside edge of the Aufführstreifens. As a result, the risk of tearing the Aufführstreifenrandes and folding over significantly reduced.

At the in 5 As shown, the web production machine has a drying section with drying devices 76 as rotating machine elements 70 , The performance strip 14 , the residual track 16 and the protective strip 18 be before the first drying device 76 ' educated. The method is advantageously used before the first drying device where the web has low strength due to the low TG. The dry content of the web is less than 55%. When using the invention, the web typically has a TG of 40-60%. The distance of the press force from the web is only a few millimeters, because immediately behind the press section adheres to the wet web, especially when the roller 70 and / or the back of the support fabric is vacuum-applied to the supportive tissue. At a small distance between the press force and the protective strip, the protective strip can be easily lifted off the tissue supporting it.

The Bounding deflection tape can be added to the protective strip in lateral Direction of the web further away from the leader strip, aslant be arranged to the web running direction. In other words, the press Force, viewed from above the track, slightly oblique to the web direction be arranged. The press force then pulls the protective strip from the stripper page away more to the rest of the way.

When Auslenkvorrichtungen may instead of or in addition to the press-force device and a pneumatic guide plate or one at his nozzle no dirt or substance applying sucker can be used. When using a nipple is important to use this as possible little air is sucked in. When using a nipple is the protective strip width 10-100 mm, preferably 20-50 mm. When using a belt conveyor, for example, the press force, the protective strip width, as already said, preferably 100-250 mm and is therefore of the order of magnitude the bandwidth. The application works when the belt conveyor in Comparison to the protective strip a little narrower, the same width or even something is wider. Preferably, the belt conveyor is narrower than the protective strip, For example, by 10 mm on both edges.

This in 5 The system shown also includes a lace cutter 80 with two nozzles. The nozzles are used to cut the Aufführstreifens 14 as well as the rest of the train 16 and the protective strip 18 , both of the reject treatment 74 be supplied. The lace cutter 80 also has devices 44 for removing the protective strip 18 in the reject treatment 74 without leaving the edges of the Aufführstreifens 14 to damage.

6 shows a press concept 60 with central roller 58 in which the method according to the invention is used. The direction of the material web to be produced is indicated by the arrow 26 specified. In the process, the material web 20 the performance strip 14 , the residual track 16 and between these the protective strip 18 educated. The protective strip 18 is from a different location than the rest of the train 16 the reject treatment 74 fed. More precisely, the protective strip 18 will be in front of the pressnips 62 with the for removing the protective strip 18 in the reject treatment 74 serving resources 44 from his position between Aufführstreifen 14 and residual track 16 deflected. The residual train 16 turn behind the press nips 62 from the performance strip 14 steered away. Thus, the residual web in the nip does not adhere to the Aufführstreifen again, and the residual web can be fed to the reject treatment without damaging the Aufführstreifen thereby. After the removal of the residual web into the reject treatment, the leader strip is present in intact form.

The System is suitable in addition to the presented press with central roller accordingly also for Series presses with preferably closed web guide. This will be the residual track and the performance strip supported passed without protective strip through at least one press nip.

Claims (12)

Method of forming a tread strip in one with scrap treatment ( 74 ) provided material web-making machine, with a material web ( 20 ), from which a leader strip ( 14 ), a reject, ie residual ( 16 ) and between these a protective strip ( 18 ), characterized in that the protective strip ( 18 ) from a location other than the residual track ( 16 ) of the committee treatment ( 74 ) is supplied. Method according to claim 1, characterized in that the protective strip ( 18 ) from a position between Aufführstreifen ( 14 ) and residual track ( 16 ) of the committee treatment ( 74 ) is supplied. Method according to claim 1 or 2, in which the material web-making machine comprises rotating machine elements ( 70 ), and in which the residual web ( 16 ) of a rotating machine element ( 70 ' ) from the committee treatment ( 74 ), characterized in that the protective strip ( 18 ) in front of the rotating machine element ( 70 ' ), the residual track ( 16 ) but from the rotating one Machine element ( 70 ' ) from the committee treatment ( 74 ) is supplied. Method according to claim 3, characterized in that the protective strip ( 18 ) between two consecutive rotating machine elements ( 70 ) and the treatment of waste ( 74 ) is supplied. Method according to any one of claims 1 to 4, wherein the web-forming machine also includes a drying section with drying devices ( 76 ) as rotating machine elements ( 70 ), characterized in that the leader strip ( 14 ), the residual track ( 16 ) and the protective strip ( 18 ) before the first drying device ( 76 ' ) are formed. Method according to claim 5, characterized in that the residual web ( 16 ) from the first drying device ( 76 ' ) from the committee treatment ( 74 ) is supplied. A method of threading the web in a web-forming machine used to make a web of material, and the rotating machine elements ( 70 ), wherein - first the full width material web ( 20 ) of the committee treatment ( 74 ), - from the web ( 20 ) a Aufführstreifen ( 14 ), a residual track ( 16 ) and a protective strip ( 18 ), - the leader strip ( 14 ), while the residual web ( 16 ) and the protective strip ( 18 ) of the committee treatment ( 74 ), and - the leader strip ( 14 ) is moved on production width, characterized in that - during the Aufführstreifen ( 14 ) - the protective strip ( 18 ) from a location other than the residual track ( 16 ) of the committee treatment ( 74 ) is supplied. System for forming a leader strip in a web-forming machine comprising - rotating machine elements ( 76 ), - Medium ( 22 ) for the formation of the performance strip ( 14 ), - Medium ( 24 ) to form the protective strip ( 18 ) and the residual web ( 16 ), the protective strip ( 18 ) between the leader strip ( 14 ) and the residual web ( 16 ), and - devices ( 52 ) for removing the residual web ( 16 ) in the treatment of waste ( 74 ), characterized in that - devices ( 44 ) for removing the protective strip ( 18 ) in the treatment of waste ( 74 ) are provided, and for removing the protective strip ( 18 ) in the treatment of waste ( 74 ) devices ( 44 ) at a location other than that for discharging the residual web ( 16 ) in the treatment of waste ( 74 ) devices ( 52 ) are arranged. System according to claim 8, characterized in that the means for removing the protective strip ( 18 ) in the treatment of waste ( 74 ) devices ( 44 ) in connection with the formation of the protective strip ( 18 ) and the residual web ( 16 ) ( 24 ) are arranged. System according to claim 6 or 7, characterized in that the means for removing the protective strip ( 18 ) in the treatment of waste ( 74 ) devices ( 44 ) a rotating deflection belt ( 46 ). System according to any one of claims 8 to 10, characterized in that the means for removing the protective strip ( 18 ) in the treatment of waste ( 74 ) devices ( 44 ) in the running direction of the material web ( 20 ) considered in time before the removal of the residual web ( 16 ) in the treatment of waste ( 74 ) devices ( 52 ) are arranged. Lace trimmers with cutting devices ( 36 ) for cutting the leader strip and cutting devices ( 38 ) for cutting the protective strip ( 18 ) and the residual web ( 16 ), these cutting devices ( 36 . 38 ) for the formation of the performance strip ( 14 ) and committee treatment ( 74 ) to be led residual track ( 16 ) and committee treatment ( 74 ) protective strip ( 18 ), characterized in that the tip cutter ( 80 ) also for removing the protective strip ( 18 ) in the treatment of waste ( 74 ) without damaging the leader strip ( 14 ) devices ( 44 ).