EP4150150B1 - Clothing and method for producing clothing of this type - Google Patents
Clothing and method for producing clothing of this type Download PDFInfo
- Publication number
- EP4150150B1 EP4150150B1 EP21726571.9A EP21726571A EP4150150B1 EP 4150150 B1 EP4150150 B1 EP 4150150B1 EP 21726571 A EP21726571 A EP 21726571A EP 4150150 B1 EP4150150 B1 EP 4150150B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- longitudinal end
- clothing
- folded over
- section
- film
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 239000000463 material Substances 0.000 claims description 49
- 238000000034 method Methods 0.000 claims description 10
- 239000004744 fabric Substances 0.000 claims description 8
- 238000003466 welding Methods 0.000 claims description 8
- 230000000295 complement effect Effects 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 5
- 238000003801 milling Methods 0.000 claims description 4
- 238000007373 indentation Methods 0.000 claims 1
- 239000000123 paper Substances 0.000 description 27
- 238000005452 bending Methods 0.000 description 10
- 239000010410 layer Substances 0.000 description 9
- 239000004734 Polyphenylene sulfide Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 229920000069 polyphenylene sulfide Polymers 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 239000002356 single layer Substances 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000011112 polyethylene naphthalate Substances 0.000 description 2
- 239000011265 semifinished product Substances 0.000 description 2
- 238000009958 sewing Methods 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- 239000004696 Poly ether ether ketone Substances 0.000 description 1
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/0027—Screen-cloths
- D21F1/0063—Perforated sheets
Definitions
- the invention relates to a covering for a machine for producing and/or finishing a material web, in particular a fibrous web, such as a paper, cardboard or tissue web, the covering being designed as a band with two longitudinal end sections, on which the band forms an endless band is closable or closed, wherein the band is formed from a perforated film, and wherein a section of at least one of the two longitudinal end sections is bent to form a channel provided for receiving a connecting element, the bent section of the at least one longitudinal end section being in the area of a Fastening section is attached to the non-bent section of the at least one longitudinal end section, and wherein the bent section, the non-bent section and the fastening section of the at least one longitudinal end section are formed integrally with one another.
- the invention further relates to a manufacturing process for such a covering.
- a fiber suspension which consists predominantly of water and only has a small proportion of fibers, is fed to an application unit, also called a "headbox", on a paper machine.
- the rest of the paper machine then essentially only has the task of removing the water from the pulp suspension in order to produce the finished product, which can be further refined if necessary.
- the fibrous web formed from the fibrous suspension passes through several sections in the paper machine, usually at least a forming section, a press section and a drying section. Each part is usually assigned its own covering. These coverings are also known as sieves or felts. The coverings run endlessly in the respective parts of the paper machine and thus transport the fibrous web continuously the paper machine. The coverings are exposed to a lot of wear and need to be replaced regularly.
- fabrics are predominantly used as coverings, although the term “fabric” is to be understood here broadly and includes not only structures in which threads are woven together in the narrower sense, but also structures in which threads are, for example, knitted or connected to one another by spiraling are. What is relevant is that the finished “fabric” consists of individual threads. Since such fabrics are relatively complex to produce, consideration has already been given to replacing them with perforated films. For example, the reveals DE102010040089A1 a covering in the form of a perforated film. The perforation is necessary to allow water to pass through the covering while retaining the fibers.
- the seam area is always noticeably thicker than the rest of the covering.
- the thickness is substantially twice that of the remaining film.
- the term “remaining film” essentially means the area of the covering that lies between the two longitudinal end sections or outside a seam area. This increase in thickness in the seam area can lead to undesirable markings on the fibrous web transported on the covering.
- the object of the present invention to eliminate or at least reduce the disadvantages mentioned above.
- the aim is to provide a covering that can be easily inserted into a paper machine, that can be produced easily and inexpensively and that at the same time leads to no or at most very few markings in the fibrous web.
- the covering according to the invention for a machine for producing and/or finishing a material web in particular a fibrous web, such as paper, cardboard or tissue web, is designed as a band with two longitudinal end sections, on which the band can be closed or is closed to form an endless band .
- the clothing is assigned a machine direction, which indicates the direction in which the clothing rotates during intended use in the paper machine.
- the two longitudinal end sections denote sections at the two longitudinal ends of the clothing viewed in the machine direction. Once the covering has been inserted into the paper machine, the two longitudinal end sections can be closed to form a seam, so that an endless belt is formed, which can circulate in the respective section of the paper machine.
- the band is made from a perforated film.
- This can in particular be a film, such as the one mentioned at the beginning DE102010040089A1 is revealed.
- film means that there are no complex structures with free spaces between different layers, such as those in the publication WO2015/081417A1 is shown.
- the film is formed or consists of a laminate comprising several layers, with the individual layers lying flat on top of each other and being connected to one another.
- the individual layers can be formed from different materials, in particular plastics.
- Such a laminate can be produced, for example, by a coextrusion process or by a lamination process.
- the tape preferably comprises only a single layer or it consists of a laminate with several layers made of the same material, for example polyethylene terephthalate (PET), polyphenylene sulfide (PPS) or polyethylene naphthalate (PEN).
- PET polyethylene terephthalate
- PPS polyphenylene sulfide
- PEN polyethylene naphthalate
- the belt is perforated.
- the perforations can have different shapes and dimensions. As a rule, they have relatively small dimensions, with diameters no larger than 3 millimeters are.
- the perforations can be introduced into the band in different ways.
- the perforations are preferably created by punching.
- the thickness of the band can be between 1.5mm and 0.2mm, for example.
- At least one of the two longitudinal end sections is bent over to form a channel intended to receive a connecting element.
- Preferably both longitudinal end sections are bent accordingly.
- the connecting element can be, for example, a plug-in wire.
- bent section of the at least one longitudinal end section is fastened in the area of a fastening section to the non-bent section of the at least one longitudinal end section.
- the bent section, the non-bent section and the fastening section of the at least one longitudinal end section are formed in one piece with one another.
- the entire longitudinal end section is preferably formed in one piece.
- all of the aforementioned three sections or the entire longitudinal end section can be formed in one piece from the same film, the term “in one piece” not necessarily requiring that the film is monolithic; it can also be formed from a laminate comprising several layers, as described above.
- At least the bent section of the at least one longitudinal end section has a smaller material thickness than the remaining film. This means that the seam area is thinner than with the DE102017114964A1 can be formed and thus the risk of noticeable markings in the fibrous web transported on the covering is reduced.
- not only the bent, but also the non-bent section of the at least one longitudinal end section, at least in the area of the fastening section, has a smaller material thickness than the remaining film.
- the thickness of the seam can be further reduced, especially in the area in which the bent section is attached to the non-bent section.
- the material thickness of the bent section essentially corresponds to the difference between the material thickness of the non-bent section in the area of the fastening section and the material thickness of the remaining film.
- the thickness of the seam in the area in which the folded section is attached to the non-folded section can essentially correspond to the thickness of the remaining film. This minimizes the risk of marking.
- the difference between the material thickness of the non-bent section in the area of the fastening section and the bent section corresponds to at least one thickness of the connecting element.
- the connecting element can be, for example, a flat wire.
- the area of the seam in which the channel for the connecting element is formed can also have essentially the same thickness as the rest of the film.
- the at least one longitudinal end section has a plurality of projections and recesses which are designed to come into or be in toothed engagement with a plurality of projections and recesses of a complementary formed counter section
- the to Receiving the connecting element provided channel is formed by the plurality of projections on the at least one longitudinal end section and on the counter section.
- both longitudinal end sections of the band are complementary are otherwise essentially identical to one another, with both longitudinal end sections each having a plurality of projections and recesses which are suitable for coming into or being in toothed engagement with one another, the channel provided for receiving the connecting element passing through the plurality of projections is formed by the two longitudinal end sections.
- the projections and the recesses preferably all have the same dimension in the cross-machine direction, although deviations may occur at the end edges in the cross-machine direction.
- the width of the projections and/or recesses is preferably between 2mm and 15mm, more preferably about 3mm.
- the band has a main section between the two longitudinal end sections and at least one of the two longitudinal end sections, preferably both longitudinal end sections, is or are formed integrally in one piece with the main section.
- integral in one piece means that the at least one longitudinal end section is also formed from this, preferably single-layer, solid material.
- a film can be produced by means of an extrusion process, with the at least one longitudinal end section then being formed from the same film as the main section.
- the main section of the covering is free of seams.
- the main section extends from its one longitudinal end section to its other longitudinal end section with essentially the same properties.
- the main section is segmented and has at least one seam region connecting two segments together. This makes it possible to produce the covering in smaller individual parts. Before the clothing is pulled into the paper machine, the individual segments are preferably connected to one another until only the seam area, which is formed by the two longitudinal end sections of the band, is still open. Furthermore, the segmented design of the covering means that if there is a local defect in the covering, only the damaged segment can be replaced.
- the previously mentioned integrally one-piece design of the main section with at least one of the two longitudinal end sections refers to the segment of the main section which directly adjoins the corresponding longitudinal end section.
- the covering according to the invention can be produced particularly cost-effectively.
- these rolls have a smaller width than the width of a typical paper machine clothing.
- the width of such rolls is a maximum of 2000mm, while large paper machines require clothing with a width of more than 6000mm.
- the segmented design allows films with a width of less than 2000mm to be used for the covering according to the invention. Strips are cut from the rolled goods, the length of which essentially corresponds to the width of the covering to be made from it. Several of these strips are then arranged next to each other as seen in the machine direction of the clothing and connected to one another until the desired length of the clothing is achieved.
- the individual strips or segments are connected to one another in the same way that the two longitudinal end sections of the covering are connected to one another according to the invention, in particular by means of a hinge-like connection, with the respective seam areas leading to no or at least no noticeable markings in the paper web.
- a covering made in this way could be compared to a curb chain, where However, unlike a curb chain, the segments of the covering are themselves flexible or bendable.
- This curb chain-like embodiment is particularly useful if the width of the finished covering is greater than the width of the strips or segments or curb chain links.
- the direction of extrusion of the film used for the segments preferably runs essentially in the cross-machine direction of the covering.
- At least two segments, preferably all segments, of the main section are designed to be essentially identical to one another.
- the at least one longitudinal end section has a plurality of recesses which extend partly in the bent section and partly in the non-bent section.
- the term “recess” is to be understood as meaning a hole with a closed peripheral edge in the band.
- the recesses can have any shape that is suitable for producing a hinge-like toothing. However, it is particularly easy to produce and therefore preferred if the recesses are essentially rectangular.
- the recesses also preferably have dimensions that are many times larger than the dimensions of the pores in the band formed from a single-layer solid material or than the dimensions of the mesh spacings in the band formed as a fabric. It has proven to be particularly favorable in the test if the dimensions of the essentially rectangular recesses in the transverse direction of the machine are between 2mm and 15mm, preferably approximately 10mm.
- the covering according to the invention in different parts of the paper machine, but it can be used particularly advantageously as a drying fabric, which is suitable for use in a drying section of a paper, cardboard or tissue machine.
- the material is removed in such a way that the at least one longitudinal end section has at least one step. Steps can be produced relatively easily by milling and provide a flat surface for connecting the bent to the non-bent portion of the at least one longitudinal end portion.
- the material is removed in such a way that the at least one longitudinal end section has two stages.
- the bent section can therefore have a smaller thickness than the non-bent section and this in turn can have a smaller thickness than the remaining film.
- the bent section of the at least one longitudinal end section is fastened in a materially bonded manner, preferably welded, to the non-bent section of the at least one longitudinal end section, in particular with the aid of a NIR laser.
- the Figure 1 shows two longitudinal end sections 12 of a covering 10 according to the invention for a paper machine, which are designed to be complementary to one another, of which for reasons of clarity in Figure 1 only one is provided with a reference number.
- the covering 10 is designed as a band.
- a main section 14 of the band is located between the two longitudinal end sections 12 arranged at opposite longitudinal ends in the machine direction MD of the covering 10.
- the two longitudinal end sections 12 are integrally formed in one piece with the main section 14.
- the covering 10 is not shown completely, but only an upper left and a right upper corner are shown.
- the main section 14 extends significantly further than shown in these figures.
- the covering 10 also extends further in the machine transverse direction CD than shown in these figures.
- the band is made from a perforated film.
- the perforations are in the Figures 1 to 4 indicated as fine dots.
- the perforations are preferably made into the film by punching.
- the perforations can essentially have the geometric shape of a straight circular cylinder.
- the film can be formed from just one plastic layer or from several plastic layers, which are preferably co-extruded or glued or welded in a lamination process.
- a respective layer can consist, for example, of PET, PEN, PPS, PEEK, PI or polyolefins.
- Figure 1 is not the finished covering 10, but strictly speaking only a semi-finished product for producing the covering 10. This is because the two longitudinal end sections 12 have not yet been bent over to form a channel that is suitable for receiving a connecting element, in particular a plug-in wire to form a seam.
- the longitudinal end section 12 extends in Figure 1 in the machine direction MD from a longitudinal end edge 16 of the band to an imaginary line 18, from which the main part 14 then connects seamlessly.
- Several recesses 20 are made in the longitudinal end section 12. In the present exemplary embodiment, these recesses 20 have a substantially square shape. However, this is not absolutely necessary. For example, the recesses 20 could also have a substantially rectangular, but not square, shape. In the present exemplary embodiment, all recesses 20 have the same shape.
- a web 22 is arranged between two recesses immediately adjacent in the machine transverse direction CD.
- the recesses 20 and the webs 22 preferably have essentially the same dimensions in the cross-machine direction CD.
- the recesses 20 in one of the two longitudinal end sections 12 are offset in the machine transverse direction CD in relation to the recesses 20 in the other of the two longitudinal end sections 12 of the band in such a way that they do not overlap when viewed in the machine direction MD.
- each longitudinal end section 12 there are two rows of holes 24. These two rows of holes are designed in such a way that the individual holes come to lie one above the other in pairs when the longitudinal end edge 16 is folded over or bent over onto the imaginary line 18 which delimits the longitudinal end section 12.
- a thread can then be passed through the holes in a simple manner in order to fasten the bent section 26 to the non-bent section 28 of the longitudinal end section 12, in particular to sew both sections 26, 28 together.
- surface sections of the bent section 26 and the non-bent section 28 come to rest directly on one another in a fastening section 30, as shown in FIGS Figures 6a to 8b is shown.
- the holes for the thread seam in the semi-finished product.
- these holes can only be introduced into the longitudinal end section 12 after the bending when creating the thread seam itself.
- the thread seam represents only one possibility of attaching the bent section 26 to the non-bent section 28.
- other methods can also be chosen. It is particularly preferred if the connection is made by welding, in particular NIR laser welding. This achieves a stable fastening, which is also particularly low-marking compared to a thread seam. This means that when the covering 10 is used as intended, the fastening section 30 leaves essentially no marks in the fibrous web transported on the covering 10.
- a channel is formed which extends in the machine transverse direction CD and is suitable or intended for receiving a connecting element 32, in particular a plug-in wire is.
- a connecting element 32 in particular a plug-in wire is.
- Figure 2 The viewer looks at the machine side of the clothing 10, ie at the side of the clothing 10 which, when used as intended, faces the one on the clothing 10 transporting fibrous web is facing away. In this viewing direction, only the bent section 26 can be seen, but not the non-bent section 28 of the two longitudinal end sections 12. Furthermore, in this direction you can see the longitudinal end edge 16, which has come to rest on the imaginary line 18.
- An imaginary bending line which separates the folded section 26 from the non-folded section 28, which essentially remains in the plane of the main section 14 when folded, runs through the plurality of recesses 20 and webs 22 in the respective longitudinal end section 12.
- a section through one of the projections 34 is in the Figures 6a to 8b shown for three different exemplary embodiments, the connecting element 32 also being shown in these figures for illustrative purposes.
- the Figures 6a and 6b show a first variant or embodiment of the covering 10 according to the invention. All that can be seen is a section through the longitudinal end section 12.
- the longitudinal end section 12 comprises two sections, namely a section 26 facing away from the rest of the film (left in Figure 6a ) and a section 28 facing the rest of the slide (right in Figure 6a ).
- the longitudinal end section 12 is shown in a state in which the section 26 is not yet bent over and connected to the section 28.
- the finished state, in which the bent section 26 is attached to the non-bent section 28 in the area of the fastening section 30, is, however, in Figure 6b to see.
- a channel is created for the connecting element 32, which is preferably designed as a flat wire.
- the bent section 26 has a smaller material thickness than the remaining film.
- the longitudinal end section 12 has been machined with a profile milling cutter so that it now has two steps.
- a first stage 42 is arranged in the non-bent section 28.
- the non-bent section 28 has its edge, with which it adjoins the bent section 26 (left in Figure 6a ), essentially the same material thickness as the section 26.
- the first step 42 results in a step-like increase in the material thickness of the non-bent section 28, so that the non-bent section 28 in the area of the fastening section 30 (right in Figure 3a) has a material thickness corresponding to the height of the step.
- the height of the first step 42 preferably corresponds at least to the thickness of the connecting element 32.
- the non-bent section 28 points at its other edge, with which it adjoins the rest of the film (on the right in Figure 6a ) a second stage 44.
- the height of the second step 44 corresponds to the difference between the thickness of the remaining film and the thickness of the non-bent section 28 in the area of the fastening section 30.
- the height of the second step corresponds to 44 preferably essentially the material thickness of the non-bent section 26.
- FIGS 7a and 7b show a second variant or embodiment of the covering 10 according to the invention.
- the same reference numbers are used for the same or analogous features.
- the longitudinal end section 12 in the second variant only has one step 42.
- the non-bent section 28 has essentially the same material thickness as the bent section 26 over its entire length. Only at its edge (right in Figure 7a ), with which it adjoins the remaining film, the material thickness increases in steps through step 42 to the material thickness of the remaining film.
- the material thickness of the bent section 26 preferably corresponds to essentially half of the material thickness of the remaining film. The result of this is that after the section 26 has been bent over and the section 26 has been fastened in the area of the fastening section 30 to the non-bent section 28, the seam in the area of the fastening section 30 has essentially the same material thickness as the rest of the film.
- the seam only in the area of the channel for the connecting element 32 does the seam have a thickness that is greater than the thickness of the remaining film by at least the thickness of the fastening element 32.
- This is compared to the first variant according to Figures 6a and 6b less advantageous in terms of avoiding markings in the fibrous web, but this material thickening of the seam - for example depending on the one to be produced Type of paper - be harmless.
- the second embodiment has the advantages over the first embodiment that, on the one hand, the manufacturing effort is lower, since only one step instead of two steps has to be milled, and on the other hand, the material surrounding the channel has a greater thickness, so that the seam is more stable overall becomes.
- FIGS 8a and 8b show a third variant or embodiment of the covering 10 according to the invention.
- first variant according to Figures 6a and 6b or to the second variant according to Figures 7a and 7b described.
- the same reference numerals are used again for the same or analogous features.
- the longitudinal end section 12 of the third variant also only has a single step 42. This essentially corresponds to the first step 42 of the first variant, with the exception of the fact that the step height is larger.
- the material thickness of the non-bent section 28 in the area of the fastening section essentially corresponds to the material thickness of the remaining film.
- the third variant also has the advantage over the first variant that the manufacturing effort can be reduced because only one step instead of two steps has to be milled.
- the seam has a greater material thickness than the rest of the film.
- the increase in thickness essentially corresponds to the material thickness of the bent section 26.
- a further advantage of the third variant over the first and second variants is that the seam in the area of the fastening section 30 is particularly stable due to the greater material thickness in this area.
- Figure 9 shows schematically a further embodiment of a covering 10' according to the invention. While at the in the Figures 1 to 8b In the embodiments shown, the main section 14 is free of short areas, that is to say it is essentially designed with homogeneous properties in the machine direction MD. In the further embodiment, the main section is designed to be segmented, with two immediately adjacent segments 40 are connected to one another via a seam area 38. In Figure 7 Only a few segments 40 are shown, but it is advantageous if the entire covering 10' is formed from such segments 40, the segments 40 preferably being essentially identical to one another.
- the seam areas can be designed in the same way as in connection with the various embodiments according to Figures 6a to 8b has been described. Each segment 40 can therefore essentially correspond to the covering 10 according to the previously described embodiments, with the difference that the main section 14 is shorter.
- the covering 10′ according to the further embodiment has some advantages over the previously described embodiments. Films can be used to produce them, which are relatively simple and therefore inexpensive to produce.
- the segmented design of the covering 10' according to the invention makes it possible to use films with a width of less than 1300 mm, preferably approximately 1250 mm or less, for the band, with the dimension of the individual segments 40 in the machine direction MD not exceeding the width of the film webs.
- the dimension of the segments 40 in the machine direction MD may be approximately 1900 mm or less.
- the dimensions of the segments 40 in the cross-machine direction CD are not critical and can easily be matched to the width of the paper machine for which the covering 10 'is intended, since the films are extruded in webs that can in principle be infinitely long.
- the covering 10' usually has a dimension in the cross-machine direction CD that is significantly larger than 2000mm.
- the individual segments 40 preferably have a dimension in the machine direction MD that is significantly smaller than their dimension in the cross-machine direction CD.
- the direction of extrusion of the film used for the segments 40 preferably runs essentially in the cross-machine direction CD of the covering 10'.
- a film with a dimension in the machine direction MD of less than 2000mm can also be transported and further processed relatively easily.
- a system for introducing the perforations such as a punching system, can be manufactured and operated relatively easily.
- a further advantage of the segmented design of the covering 10' according to the invention is that in the event of a local defect during production or operation of the covering 10', the entire covering does not have to be replaced, but rather it is sufficient to simply replace the affected segment 40. In addition, there is less waste during production due to the segmented design and coverings of different lengths can be put together very quickly from prefabricated segments.
- the covering 10 according to the embodiments Figures 1 to 8b , as well as the covering 10' according to the further embodiment Figure 9 are preferably dryer fabrics, ie coverings that are suitable and intended for use in a drying section of a paper machine.
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- Package Frames And Binding Bands (AREA)
- Paper (AREA)
Description
Die Erfindung betrifft eine Bespannung für eine Maschine zur Herstellung und/oder Veredelung einer Materialbahn, insbesondere einer Faserstoffbahn, wie bspw. Papier-, Karton- oder Tissuebahn, wobei die Bespannung als Band mit zwei Längsendenabschnitten ausgebildet ist, an denen das Band zu einem Endlosband schließbar bzw. geschlossen ist, wobei das Band aus einer perforierten Folie gebildet ist, und wobei ein Abschnitt von wenigstens einem der beiden Längsendenabschnitte zur Ausbildung eines zur Aufnahme eines Verbindungselements vorgesehenen Kanals umgebogen ist, wobei der umgebogene Abschnitt des wenigstens einen Längsendenabschnitts in dem Bereich eines Befestigungsabschnitts an dem nicht umgebogenen Abschnitt des wenigstens einen Längsendenabschnitts befestigt ist, und wobei der umgebogene Abschnitt, der nicht umgebogene Abschnitt und der Befestigungsabschnitt des wenigstens einen Längsendenabschnitt einstückig miteinander ausgebildet sind. Ferner betrifft die Erfindung ein Herstellverfahren für eine solche Bespannung.The invention relates to a covering for a machine for producing and/or finishing a material web, in particular a fibrous web, such as a paper, cardboard or tissue web, the covering being designed as a band with two longitudinal end sections, on which the band forms an endless band is closable or closed, wherein the band is formed from a perforated film, and wherein a section of at least one of the two longitudinal end sections is bent to form a channel provided for receiving a connecting element, the bent section of the at least one longitudinal end section being in the area of a Fastening section is attached to the non-bent section of the at least one longitudinal end section, and wherein the bent section, the non-bent section and the fastening section of the at least one longitudinal end section are formed integrally with one another. The invention further relates to a manufacturing process for such a covering.
Bei der industriellen Herstellung von Papier, Karton oder Tissue wird eine Faserstoffsuspension, die überwiegend aus Wasser besteht und nur einen geringen Anteil von Fasern aufweist, einem Auftragswerk, auch "Headbox" genannt, einer Papiermaschine zugeführt. Der Rest der Papiermaschine hat dann im Wesentlichen nur noch die Aufgabe, der Faserstoffsuspension das Wasser zu entziehen, um das fertige Produkt, welches bei Bedarf noch veredelt werden kann, zu erzeugen. Hierzu durchläuft die sich aus der Faserstoffsuspension bildende Faserstoffbahn in der Papiermaschine mehrere Partien, in der Regel zumindest eine Formierpartie, eine Pressenpartie und eine Trockenpartie. Jeder Partie ist üblicher Weise eine eigene Bespannung zugeordnet. Diese Bespannungen werden auch als Siebe oder Filze bezeichnet. Die Bespannungen laufen endlos in den jeweiligen Partien der Papiermaschine um und transportieren so die Faserstoffbahn kontinuierlich durch die Papiermaschine. Die Bespannungen sind dabei einem hohen Verschleiß ausgesetzt und müssen regelmäßig ausgewechselt werden.In the industrial production of paper, cardboard or tissue, a fiber suspension, which consists predominantly of water and only has a small proportion of fibers, is fed to an application unit, also called a "headbox", on a paper machine. The rest of the paper machine then essentially only has the task of removing the water from the pulp suspension in order to produce the finished product, which can be further refined if necessary. For this purpose, the fibrous web formed from the fibrous suspension passes through several sections in the paper machine, usually at least a forming section, a press section and a drying section. Each part is usually assigned its own covering. These coverings are also known as sieves or felts. The coverings run endlessly in the respective parts of the paper machine and thus transport the fibrous web continuously the paper machine. The coverings are exposed to a lot of wear and need to be replaced regularly.
Als Bespannungen werden heute überwiegend Gewebe verwendet, wobei der Begriff "Gewebe" hier breit zu verstehen ist und nicht nur Strukturen umfasst, bei denen Fäden im engeren Sinne miteinander verwoben sind, sondern auch Strukturen, bei denen Fäden zum Beispiel gewirkt oder durch Spiralisierung miteinander verbunden sind. Relevant ist, dass das fertige "Gewebe" aus einzelnen Fäden besteht. Da derartige Gewebe relativ aufwendig herzustellen sind, wurde bereits überlegt, diese durch perforierte Folien zu ersetzen. Beispielsweise offenbart die
Bei der
Um dieses Problem zu lösen, wurde von der Anmelderin bereits in der Druckschrift
Nachteilig an der in der
Ferner sei auch noch auf die Druckschrift
Es ist daher Aufgabe der vorliegenden Erfindung, die zuvor genannten Nachteile zu beseitigen oder zumindest zu reduzieren. Insbesondere soll eine Bespannung bereitgestellt werden, die sich leicht in eine Papiermaschine einführen lässt, die einfach und kostengünstig herstellbar ist und die gleichzeitig zu keinen oder allenfalls sehr geringen Markierungen in der Faserstoffbahn führt.It is therefore the object of the present invention to eliminate or at least reduce the disadvantages mentioned above. In particular, the aim is to provide a covering that can be easily inserted into a paper machine, that can be produced easily and inexpensively and that at the same time leads to no or at most very few markings in the fibrous web.
Gelöst wird diese Aufgabe durch eine Bespannung gemäß Anspruch 1 und ein Herstellverfahren für eine solche Bespannung gemäß Anspruch 12. Vorteilhafte Weiterbildungen der Erfindung sind Gegenstand der Unteransprüche.This object is achieved by a covering according to
Die erfindungsgemäße Bespannung für eine Maschine zur Herstellung und/oder Veredelung einer Materialbahn, insbesondere einer Faserstoffbahn, wie bspw. Papier-, Karton- oder Tissuebahn, ist als Band mit zwei Längsendenabschnitten ausgebildet, an denen das Band zu einem Endlosband schließbar bzw. geschlossen ist.The covering according to the invention for a machine for producing and/or finishing a material web, in particular a fibrous web, such as paper, cardboard or tissue web, is designed as a band with two longitudinal end sections, on which the band can be closed or is closed to form an endless band .
Der Bespannung ist dabei eine Maschinenrichtung zugeordnet, welche die Richtung bezeichnet, in welcher die Bespannung beim bestimmungsgemäßen Gebrauch in der Papiermaschine umläuft. Die beiden Längsendenabschnitte bezeichnen Abschnitte an den beiden in Maschinenrichtung betrachteten Längsenden der Bespannung. Ist die Bespannung erst einmal in die Papiermaschine eingeführt, lassen sich die beiden Längsendenabschnitte zu einer Naht schließen, so dass ein Endlosband gebildet wird, welches in der jeweiligen Sektion der Papiermaschine umlaufen kann.The clothing is assigned a machine direction, which indicates the direction in which the clothing rotates during intended use in the paper machine. The two longitudinal end sections denote sections at the two longitudinal ends of the clothing viewed in the machine direction. Once the covering has been inserted into the paper machine, the two longitudinal end sections can be closed to form a seam, so that an endless belt is formed, which can circulate in the respective section of the paper machine.
Das Band ist dabei aus einer perforierten Folie gebildet. Dabei kann es sich insbesondere um eine Folie handeln, wie sie zum Beispiel in der eingangs erwähnten
Wenigstens einer der beiden Längsendenabschnitte ist dabei zur Ausbildung eines zur Aufnahme eines Verbindungselements vorgesehenen Kanals umgebogen. Vorzugsweise sind beide Längsendenabschnitte entsprechend umgebogen. Das Verbindungselement kann zum Beispiel ein Steckdraht sein.At least one of the two longitudinal end sections is bent over to form a channel intended to receive a connecting element. Preferably both longitudinal end sections are bent accordingly. The connecting element can be, for example, a plug-in wire.
Ferner ist der umgebogene Abschnitt des wenigstens einen Längsendenabschnitts in dem Bereich eines Befestigungsabschnitts an dem nicht umgebogenen Abschnitt des wenigstens einen Längsendenabschnitts befestigt.Furthermore, the bent section of the at least one longitudinal end section is fastened in the area of a fastening section to the non-bent section of the at least one longitudinal end section.
Dabei sind und der umgebogene Abschnitt, der nicht umgebogene Abschnitt und der Befestigungsabschnitt des wenigstens einen Längsendenabschnitt einstückig miteinander ausgebildet. Vorzugsweise ist der gesamte Längsendenabschnitt einstückig ausgebildet. Insbesondere können die zuvor genannten drei Abschnitte alle bzw. kann der gesamte Längsendenabschnitt einstückig aus derselben Folie gebildet sein, wobei der Begriff "einstückig" nicht zwingend erfordert, dass die Folie monolithisch ausgebildet ist; sie kann auch aus einem mehrere Schichten umfassenden Laminat gebildet sein, wie zuvor beschrieben.The bent section, the non-bent section and the fastening section of the at least one longitudinal end section are formed in one piece with one another. The entire longitudinal end section is preferably formed in one piece. In particular, all of the aforementioned three sections or the entire longitudinal end section can be formed in one piece from the same film, the term “in one piece” not necessarily requiring that the film is monolithic; it can also be formed from a laminate comprising several layers, as described above.
Erfindungsgemäß weist - anders als in der eingangs genannten
Vorzugsweise weist dabei nicht nur der umgebogene, sondern auch der nicht umgebogene Abschnitt des wenigstens einen Längsendenabschnitts), zumindest im Bereich des Befestigungsabschnitts, eine geringere Materialdicke auf als die restliche Folie. Somit kann gerade in dem Bereich, in dem der umgebogene Abschnitt auf dem nicht umgebogenen Abschnitt befestigt wird, die Dicke der Naht weiter reduziert werden.Preferably, not only the bent, but also the non-bent section of the at least one longitudinal end section, at least in the area of the fastening section, has a smaller material thickness than the remaining film. Thus, the thickness of the seam can be further reduced, especially in the area in which the bent section is attached to the non-bent section.
Weiter bevorzugt ist, dass die Materialdicke des umgebogenen Abschnitts im Wesentlichen dem Unterschied zwischen der Materialdicke des nicht umgebogenen Abschnitts im Bereich des Befestigungsabschnitts und der Materialdicke der restlichen Folie entspricht. Auf diese Weise kann die Dicke der Naht in dem Bereich, in dem der umgebogene Abschnitt auf dem nicht umgebogenen Abschnitt befestigt wird, im Wesentlichen der Dicke der restlichen Folie entsprechen. Hierdurch wird die Gefahr der Markierung minimal.It is further preferred that the material thickness of the bent section essentially corresponds to the difference between the material thickness of the non-bent section in the area of the fastening section and the material thickness of the remaining film. In this way, the thickness of the seam in the area in which the folded section is attached to the non-folded section can essentially correspond to the thickness of the remaining film. This minimizes the risk of marking.
Ferner kann es vorteilhaft vorgesehen sein, dass der Unterschied zwischen der Materialdicke des nicht umgebogenen Abschnitts im Bereich des Befestigungsabschnitts und des umgebogenen Abschnitts wenigstens einer Dicke des Verbindungselements entspricht. Bei dem Verbindungselement kann es sich zum Beispiel um einen Flachdraht handeln. Auf diese Weise kann auch der Bereich der Naht, in dem der Kanal für das Verbindungselement ausgebildet ist, im Wesentlichen dieselbe Dicke wie die restliche Folie aufweisen.Furthermore, it can advantageously be provided that the difference between the material thickness of the non-bent section in the area of the fastening section and the bent section corresponds to at least one thickness of the connecting element. The connecting element can be, for example, a flat wire. In this way, the area of the seam in which the channel for the connecting element is formed can also have essentially the same thickness as the rest of the film.
Zwar sind die unterschiedlichsten Verfahren zum Befestigen des umgebogenen Längsendenabschnitts an dem nicht umgebogenen Längsendenabschnitt denkbar, wie zum Beispiel Vernähen, doch hat es sich in Versuchen als besonders einfach und zuverlässig herausgestellt, wenn die beiden Abschnitte stoffschlüssig, vorzugsweise mittels Schweißen, insbesondere mittels NIR-Laserschweißen, miteinander verbunden werden. Gegenüber dem Vernähen weist das Schweißen zudem den Vorteil auf, dass die Befestigung markierungsarm ist.Although a wide variety of methods for attaching the bent longitudinal end section to the non-bent longitudinal end section are conceivable, such as sewing, tests have shown that it is particularly simple and reliable if the two sections are cohesively bonded, preferably by means of welding, in particular by means of NIR laser welding , be connected to each other. Compared to sewing, welding also has the advantage that the fastening requires few marks.
In einer vorteilhaften Ausführung der vorliegenden Erfindung weist der wenigstens eine Längsendenabschnitt eine Mehrzahl von Vorsprüngen und Rücksprüngen auf, die dazu ausgebildet sind, mit einer Mehrzahl von Vorsprüngen und Rücksprüngen eines komplementär ausgebildeten Gegenabschnitts in einen verzahnten Eingriff zu gelangen bzw. zu sein, wobei der zur Aufnahme des Verbindungselements vorgesehene Kanal durch die Mehrzahl der Vorsprünge an dem wenigstens einem Längsendenabschnitt und an dem Gegenabschnitt gebildet wird bzw. ist. Hierdurch kann eine bandscharnierartige Verbindungsstelle bzw. Naht erzeugt werden. Insbesondere, wenn das Verbindungselement ein Steckdraht ist, können die beiden Nahtteilbereiche scharnierartig um das Verbindungselement verschwenkt werden. Somit gewinnt das Band, das durch das Umbiegen des Längsendenabschnitts eine gewisse Erhöhung der Steifigkeit im Nahtbereich erfährt, einen Teil seiner Flexibilität zurück. Die Naht erstreckt sich vorzugsweise im Wesentlichen quer zur Maschinenrichtung, also in Maschinenquerrichtung.In an advantageous embodiment of the present invention, the at least one longitudinal end section has a plurality of projections and recesses which are designed to come into or be in toothed engagement with a plurality of projections and recesses of a complementary formed counter section, the to Receiving the connecting element provided channel is formed by the plurality of projections on the at least one longitudinal end section and on the counter section. This allows a band hinge-like connection point or seam to be created. In particular, if the connecting element is a plug-in wire, the two seam portions can be pivoted around the connecting element like a hinge. The band thus gains a strength by bending the longitudinal end section undergoes a certain increase in stiffness in the seam area, some of its flexibility returns. The seam preferably extends essentially transversely to the machine direction, i.e. in the cross-machine direction.
Zwar kann der Gegenabschnitt auch anders als der wenigstens eine Längsendenabschnitt ausgebildet sein, zum Beispiel durch einen von dem restlichen Band zunächst separat hergestellten Abschnitt, welcher dann mit dem anderen der beiden Längsendenabschnitte verbunden wird, jedoch wird es bevorzugt, dass beide Längsendenabschnitte des Bandes komplementär aber ansonsten im Wesentlichen identisch zueinander ausgebildet sind, wobei beide Längsendenabschnitte jeweils eine Mehrzahl von Vorsprüngen und Rücksprüngen aufweisen, die geeignet sind, miteinander in einen verzahnten Eingriff zu gelangen bzw. zu sein, wobei der zur Aufnahme des Verbindungselements vorgesehene Kanal durch die Mehrzahl der Vorsprünge an den beiden Längsendenabschnitten gebildet wird bzw. ist.Although the counter section can also be designed differently than the at least one longitudinal end section, for example by a section that is initially manufactured separately from the remaining band and which is then connected to the other of the two longitudinal end sections, it is preferred that both longitudinal end sections of the band are complementary are otherwise essentially identical to one another, with both longitudinal end sections each having a plurality of projections and recesses which are suitable for coming into or being in toothed engagement with one another, the channel provided for receiving the connecting element passing through the plurality of projections is formed by the two longitudinal end sections.
Die Vorsprünge und die Rücksprünge weise vorzugsweise alle dieselbe Abmessung in Maschinenquerrichtung auf, wobei es an den endseitigen Rändern in Maschinenquerrichtung zu Abweichungen kommen kann. Die Breite der Vorsprünge und/oder Rücksprünge beträgt vorzugsweise zwischen 2mm und 15mm, weiter bevorzugt etwa 3mm.The projections and the recesses preferably all have the same dimension in the cross-machine direction, although deviations may occur at the end edges in the cross-machine direction. The width of the projections and/or recesses is preferably between 2mm and 15mm, more preferably about 3mm.
Als Weiterbildung wird ferner vorgeschlagen, dass das Band zwischen den beiden Längsendenabschnitten einen Hauptabschnitt aufweist und wenigstens einer der beiden Längsendenabschnitte, vorzugsweise beide Längsendenabschnitte, integral einstückig mit dem Hauptabschnitt ausgebildet ist bzw. sind. Unter "integral einstückig" ist zu verstehen, dass auch der wenigstens eine Längsendenabschnitt aus diesem, vorzugsweise einlagigen, Vollmaterial gebildet ist. Beispielweise kann eine Folie mittels eines Extrusionsprozesses hergestellt sein, wobei der wenigstens eine Längsendenabschnitt dann aus derselben Folie wie der Hauptabschnitt gebildet ist.As a further development, it is further proposed that the band has a main section between the two longitudinal end sections and at least one of the two longitudinal end sections, preferably both longitudinal end sections, is or are formed integrally in one piece with the main section. The term “integral in one piece” means that the at least one longitudinal end section is also formed from this, preferably single-layer, solid material. For example, a film can be produced by means of an extrusion process, with the at least one longitudinal end section then being formed from the same film as the main section.
In einer bevorzugten Ausführungsform ist der Hauptabschnitt der Bespannung frei von Nahtstellen. Mit anderen Worten erstreckt sich der Hauptabschnitt mit im Wesentlichen geleichbleibenden Eigenschaften von seinem einen Längsendenabschnitt zu seinem anderen Längsendenabschnitt.In a preferred embodiment, the main section of the covering is free of seams. In other words, the main section extends from its one longitudinal end section to its other longitudinal end section with essentially the same properties.
In einer alternativen und sogar noch stärker bevorzugten Ausführungsform ist der Hauptabschnitt jedoch segmentiert ausgebildet und weist wenigstens einen Nahtbereich auf, der zwei Segmente miteinander verbindet. Hierdurch ist es möglich, die Bespannung in kleineren Einzelteilen zu fertigen. Vor dem Einziehen der Bespannung in die Papiermaschine werden die einzelnen Segmente vorzugsweise miteinander verbunden, bis nur noch der Nahtbereich, der durch die beiden Längsendenabschnitte des Bandes gebildet wird, offen ist. Ferner erlaubt die segmentierte Bauweise der Bespannung, dass bei einer lokalen Fehlstelle der Bespannung lediglich das beschädigte Segment ausgewechselt werden kann.However, in an alternative and even more preferred embodiment, the main section is segmented and has at least one seam region connecting two segments together. This makes it possible to produce the covering in smaller individual parts. Before the clothing is pulled into the paper machine, the individual segments are preferably connected to one another until only the seam area, which is formed by the two longitudinal end sections of the band, is still open. Furthermore, the segmented design of the covering means that if there is a local defect in the covering, only the damaged segment can be replaced.
Ist der Hauptabschnitt segmentiert ausgebildet, so bezieht sich die zuvor erwähnte integral einstückige Ausbildung des Hauptabschnitts mit wenigstens einem der beiden Längsendenabschnitte auf das Segment des Hauptabschnitts, welches unmittelbar an den entsprechenden Längsendenabschnitt angrenzt.If the main section is designed to be segmented, the previously mentioned integrally one-piece design of the main section with at least one of the two longitudinal end sections refers to the segment of the main section which directly adjoins the corresponding longitudinal end section.
Bei der segmentierten Ausbildung kann die erfindungsgemäße Bespannung besonders kostengünstig hergestellt werden. Zwar gibt es auf dem Markt prinzipiell geeignete Kunststofffolien als Rollenware zu einem vergleichsweise niedrigen Preis, diese Rollen weisen jedoch eine geringere Breite auf als die Breite einer typischen Papiermaschinenbespannung. In der Regel beträgt die Breite solcher Rollen maximal 2000mm, während große Papiermaschinen Bespannungen mit einer Breite von mehr als 6000mm benötigen. Die segmentierte Ausführung erlaubt es, für die erfindungsgemäße Bespannung Folien mit einer Breite von kleiner als 2000mm zu verwenden. Dabei werden von der Rollenware Streifen abgeschnitten, deren Länge im Wesentlichen der Breite der daraus herzustellenden Bespannung entspricht. Mehrere dieser Streifen werden dann in Maschinenrichtung der Bespannung gesehen nebeneinander angeordnet und miteinander verbunden, bis die gewünschte Länge der Bespannung erreicht ist. Vorteilhafter Weise werden die einzelnen Streifen bzw. Segmente miteinander genauso verbunden, wie auch erfindungsgemäß die beiden Längsendenabschnitte der Bespannung miteinander erfindungsgemäß verbunden werden, insbesondere mittels einer scharnierartigen Verbindung, wobei die jeweiligen Nahtbereiche zu keinen oder zumindest zu keinen merklichen Markierungen in der Papierbahn führen. Ein auf diese Weise hergestellte Bespannung könnte mit einer Panzerkette verglichen werden, wobei jedoch die Segmente der Bespannung, anders als bei eine Panzerkette, selbst flexibel bzw. biegsam sind.With the segmented design, the covering according to the invention can be produced particularly cost-effectively. Although there are in principle suitable plastic films on the market in rolls at a comparatively low price, these rolls have a smaller width than the width of a typical paper machine clothing. As a rule, the width of such rolls is a maximum of 2000mm, while large paper machines require clothing with a width of more than 6000mm. The segmented design allows films with a width of less than 2000mm to be used for the covering according to the invention. Strips are cut from the rolled goods, the length of which essentially corresponds to the width of the covering to be made from it. Several of these strips are then arranged next to each other as seen in the machine direction of the clothing and connected to one another until the desired length of the clothing is achieved. Advantageously, the individual strips or segments are connected to one another in the same way that the two longitudinal end sections of the covering are connected to one another according to the invention, in particular by means of a hinge-like connection, with the respective seam areas leading to no or at least no noticeable markings in the paper web. A covering made in this way could be compared to a curb chain, where However, unlike a curb chain, the segments of the covering are themselves flexible or bendable.
Diese Panzerketten-artige Ausführungsform ist insbesondere dann sinnvoll, wenn die Breite der fertigen Bespannung größer als die Breite der Streifen bzw. Segmente oder Panzerkettenglieder ist.This curb chain-like embodiment is particularly useful if the width of the finished covering is greater than the width of the strips or segments or curb chain links.
Die Extrusionsrichtung der für die Segmente verwendeten Folie verläuft vorzugsweise im Wesentlichen in Maschinenquerrichtung der Bespannung.The direction of extrusion of the film used for the segments preferably runs essentially in the cross-machine direction of the covering.
In einer noch weiter bevorzugten Ausführungsform sind wenigstens zwei Segmente, vorzugsweise alle Segmente, des Hauptabschnitts im Wesentlichen identisch zueinander ausgebildet. Hierdurch kann die erfindungsgemäße Bespannung besonders kostengünstig hergestellt werden.In an even further preferred embodiment, at least two segments, preferably all segments, of the main section are designed to be essentially identical to one another. As a result, the covering according to the invention can be produced particularly cost-effectively.
Ferner wird vorgeschlagen, dass der wenigstens eine Längsendenabschnitt eine Mehrzahl von Ausnehmungen aufweist, die sich teilweise in dem umgebogenen Abschnitt und teilweise in dem nicht umgebogenen Abschnitt erstrecken. Unter dem Begriff "Ausnehmung" ist im Sinne der vorliegenden Erfindung ein Loch mit einem geschlossenen Umfangsrand im Band zu verstehen. Zwar wäre es auch denkbar, wenigstens einen der beiden Längsendenabschnitte des Bandes mit zum Längsende hin offenen Schlitzen zu versehen, doch werden aus Stabilitätsgründen Löcher mit einem geschlossenen Umfangsrand im Band bevorzugt.Furthermore, it is proposed that the at least one longitudinal end section has a plurality of recesses which extend partly in the bent section and partly in the non-bent section. For the purposes of the present invention, the term “recess” is to be understood as meaning a hole with a closed peripheral edge in the band. Although it would also be conceivable to provide at least one of the two longitudinal end sections of the band with slots that are open towards the longitudinal end, holes with a closed peripheral edge in the band are preferred for reasons of stability.
Prinzipiell können die Ausnehmungen jede beliebige Form aufweisen, die geeignet ist, eine scharnierartige Verzahnung zu erzeugen. Besonders einfach herzustellen und daher bevorzugt ist es jedoch, wenn die Ausnehmungen im Wesentlichen rechteckig ausgebildet sind. Die Ausnehmungen weisen zudem bevorzugt Abmessungen auf, die um ein Vielfaches größer sind als die Abmessungen der Poren in dem aus einem einlagigen Vollmaterial gebildeten Band oder als die Abmessungen der Maschenabstände in dem als Gewebe gebildeten Band. Als besonders günstig hat sich im Test erwiesen, wenn die Abmessung der im Wesentlichen rechteckigen Ausnehmungen in Maschinenquerrichtung jeweils zwischen 2mm und 15mm, vorzugsweise ca. 10mm beträgt.In principle, the recesses can have any shape that is suitable for producing a hinge-like toothing. However, it is particularly easy to produce and therefore preferred if the recesses are essentially rectangular. The recesses also preferably have dimensions that are many times larger than the dimensions of the pores in the band formed from a single-layer solid material or than the dimensions of the mesh spacings in the band formed as a fabric. It has proven to be particularly favorable in the test if the dimensions of the essentially rectangular recesses in the transverse direction of the machine are between 2mm and 15mm, preferably approximately 10mm.
Prinzipiell ist es zwar möglich, die erfindungsgemäße Bespannung in unterschiedlichen Partien der Papiermaschine zum Einsatz zu bringen, jedoch kann sie besonders vorteilhaft als Trockensieb Anwendung finden, welches für einen Einsatz in einer Trockenpartie einer Papier-, Karton- oder Tissuemaschine geeignet ist.In principle, it is possible to use the covering according to the invention in different parts of the paper machine, but it can be used particularly advantageously as a drying fabric, which is suitable for use in a drying section of a paper, cardboard or tissue machine.
Die vorliegende Erfindung betrifft ferner ein Verfahren zur Herstellung einer Bespannung, vorzugsweise einer zuvor beschriebenen Bespannung, für eine Maschine zur Herstellung und/oder Veredelung einer Materialbahn, insbesondere einer Faserstoffbahn, wie bspw. Papier-, Karton- oder Tissuebahn, umfassend die folgenden Schritte:
- Bereitstellen eines zwei Längsendenabschnitte aufweisenden Bandes aus einer perforierten Folie,
- Umbiegen eines Abschnitts von wenigstens einem der beiden Längsendenabschnitte zur Ausbildung eines zur Aufnahme eines Verbindungselements vorgesehenen Kanals und
- Befestigen des umgebogenen Abschnitts des wenigstens einen Längsendenabschnitts an dem nicht umgebogenen Abschnitt des wenigstens einen Längsendenabschnitts,
- Providing a band made of a perforated film having two longitudinal end sections,
- Bending over a section of at least one of the two longitudinal end sections to form a channel intended to receive a connecting element and
- Fastening the bent section of the at least one longitudinal end section to the non-bent section of the at least one longitudinal end section,
Die Merkmale des erfindungsgemäßen Herstellverfahrens und die Merkmale der erfindungsgemäßen Bespannung, sowie deren damit verbundenen Vorteile sind sinngemäß austauschbar und gelten wechselseitig.The features of the manufacturing method according to the invention and the features of the covering according to the invention, as well as their associated advantages, are interchangeable and apply mutually.
So wird vorgeschlagen, dass der Materialabtrag derart erfolgt, dass der wenigstens eine Längsendenabschnitt wenigstens eine Stufe aufweist. Stufen können relativ einfach durch Fräsen hergestellt werden und bieten eine plane Fläche für die Verbindung des umgebogenen mit dem nicht umgebogenen Abschnitt des wenigstens einen Längsendenabschnitts.It is therefore proposed that the material is removed in such a way that the at least one longitudinal end section has at least one step. Steps can be produced relatively easily by milling and provide a flat surface for connecting the bent to the non-bent portion of the at least one longitudinal end portion.
Weiter bevorzugt erfolgt der Materialabtrag derart, dass der wenigstens eine Längsendenabschnitt zwei Stufen aufweist. So kann der umgebogene Abschnitt eine geringere Dicke als der nicht umgebogene Abschnitt und dieser wiederum eine geringere Dicke als die restliche Folie aufweisen.More preferably, the material is removed in such a way that the at least one longitudinal end section has two stages. The bent section can therefore have a smaller thickness than the non-bent section and this in turn can have a smaller thickness than the remaining film.
Ferner kann das Verfahren, vorzugsweise vor dem Schritt des Umbiegens, ferner den folgenden Schritt umfasst:
- Einbringen einer Mehrzahl von Ausnehmungen in den wenigstens einen Längsendenabschnitt derart, dass in dem umgebogenen Zustand des wenigstens einen Längsendenabschnitts sich die Ausnehmungen teilweise in dem umgebogenen Abschnitt und teilweise in dem nicht umgebogenen Abschnitt erstrecken.
- Introducing a plurality of recesses into the at least one longitudinal end section such that in the bent state of the at least one longitudinal end section, the recesses extend partly in the bent section and partly in the non-bent section.
In vorteilhafter Weiterbildung des erfindungsgemäßen Herstellverfahrens wird vorgeschlagen, dass der umgebogene Abschnitt des wenigstens einen Längsendenabschnitts an dem nicht umgebogenen Abschnitt des wenigstens einen Längsendenabschnitts stoffschlüssig befestigt, vorzugsweise angeschweißt wird, insbesondere mit Hilfe eines NIR-Lasers.In an advantageous development of the manufacturing method according to the invention, it is proposed that the bent section of the at least one longitudinal end section is fastened in a materially bonded manner, preferably welded, to the non-bent section of the at least one longitudinal end section, in particular with the aid of a NIR laser.
Die Erfindung wird nachfolgend anhand von schematischen und nicht maßstabsgetreuen Zeichnungen weiter erläutert. Es zeigen:
Figur 1- zwei komplementär zueinander ausgebildete Längsendenabschnitte einer erfindungsgemäßen Bespannung, wobei die Längsendenabschnitte noch nicht umgebogen sind,
- Figur 2
- die in
Fig. 1 gezeigten, komplementär zueinander ausgebildeten Längsendenabschnitte, wobei die Längsendenabschnitte jetzt umgebogen sind, - Figur 3
- die in
Fig. 2 gezeigten Längsendenabschnitte, wie sie gerade zu einem Nahtbereich zusammengeführt werden, - Figur 4
- die in
Fig. 2 gezeigten Längsendenabschnitte, wie sie zu einem Nahtbereich zusammengeführt sind, - Figur 5
- die erfindungsgemäße Bespannung mit geschlossenem Nahtbereich,
- Figuren 6a, 6b
- eine vergrößerte Ansicht durch die Schnittebene A - A in
Fig. 2 und zusätzlich ein Verbindungselement gemäß einer ersten Variante der Erfindung, - Figuren 7a, 7b
- eine vergrößerte Ansicht durch die Schnittebene A - A in
Fig. 2 und zusätzlich ein Verbindungselement gemäß einer zweiten Variante der Erfindung, - Figuren 8a, 8b
- eine vergrößerte Ansicht durch die Schnittebene A - A in
Fig. 2 und zusätzlich ein Verbindungselement gemäß einer dritten Variante der Erfindung, und - Figur 9
- eine weitere Ausführungsform der erfindungsgemäße Bespannung, bei welcher selbige segmentiert ausgebildet ist und eine Mehrzahl von Nahtbereichen aufweist.
- Figure 1
- two longitudinal end sections of a covering according to the invention which are designed to be complementary to one another, the longitudinal end sections not yet being bent over,
- Figure 2
- in the
Fig. 1 shown, complementary to each other longitudinal end sections, the longitudinal end sections are now bent, - Figure 3
- in the
Fig. 2 Longitudinal end sections shown as they are currently being brought together to form a seam area, - Figure 4
- in the
Fig. 2 shown longitudinal end sections, as they are brought together to form a seam area, - Figure 5
- the covering according to the invention with a closed seam area,
- Figures 6a, 6b
- an enlarged view through the section plane A - A in
Fig. 2 and additionally a connecting element according to a first variant of the invention, - Figures 7a, 7b
- an enlarged view through the section plane A - A in
Fig. 2 and additionally a connecting element according to a second variant of the invention, - Figures 8a, 8b
- an enlarged view through the section plane A - A in
Fig. 2 and additionally a connecting element according to a third variant of the invention, and - Figure 9
- a further embodiment of the covering according to the invention, in which the same is segmented and has a plurality of seam areas.
Die
Erfindungsgemäß ist das Band aus einer perforierten Folie ausgebildet. Die Perforationen sind in den
In
Der Längsendenabschnitt 12 erstreckt sich in
Ferner erkennt man in
Es ist aber nicht notwendig, die Löcher für die Fadennaht bereits in das Halbzeug einzubringen. Alternativ können diese Löcher auch erst nach dem Umbiegen bei der Erstellung der Fadennaht selbst in den Längsendenabschnitt 12 eingebracht werden. Ferner stellt die Fadennaht nur eine Möglichkeit dar, den umgebogenen Abschnitt 26 an dem nicht umgebogenen Abschnitt 28 zu befestigen. Es können jedoch auch andere Verfahren gewählt werden. Besonders bevorzugt ist es, wenn die Verbindung durch Schweißen, insbesondere NIR-Laserschweißen, erfolgt. Hierdurch wird eine stabile Befestigung erzielt, die zudem gegenüber einer Fadennaht besonders markierungsarm ist. Dies bedeutet, dass im bestimmungsgemäßen Gebrauch der Bespannung 10 der Befestigungsabschnitt 30 im Wesentlichen keine Abdrücke in der auf der Bespannung 10 transportierten Faserstoffbahn hinterlässt.However, it is not necessary to make the holes for the thread seam in the semi-finished product. Alternatively, these holes can only be introduced into the
Werden die beiden Längsendenabschnitte 12 gemäß der vorliegenden Erfindung umgebogen und die umgebogenen Abschnitte 26 jeweils an den nicht umgebogenen Abschnitten 28 befestigt, so wird ein sich in Maschinenquerrichtung CD erstreckender Kanal ausgebildet, welcher zur Aufnahme eines Verbindungselements 32, insbesondere eines Steckdrahtes, geeignet bzw. vorgesehen ist. Dies ist in den
Eine gedachte Biegelinie, die den umgeschlagenen Abschnitt 26 von dem nicht umgeschlagenen Abschnitt 28 trennt, welcher beim Umschlagen im Wesentlichen weiterhin in der Ebene des Hauptabschnitts 14 verbleibt, verläuft dabei durch die Mehrzahl von Ausnehmungen 20 und Stege 22 in dem jeweiligen Längsendenabschnitt 12. Dadurch bilden sich bei dem Umbiegen eine Mehrzahl von Vorsprüngen 34 und Rücksprüngen 36 an dem jeweiligen Längsendenabschnitt 12, wie in
Um das Band der erfindungsgemäßen Bespannung 10 zu einem Endlosband zu schließen, welches in
Die
Erfindungsgemäß weist der umgebogene Abschnitt 26 eine geringere Materialdicke als die restliche Folie auf.According to the invention, the
In der Ausführungsvariante gemäß den
Der nicht umgebogene Abschnitt 28 weist an seinem anderen Rand, mit welchem er an die restliche Folie angrenzt (rechts in
Durch diese vorteilhafte Ausgestaltung kann eine Naht erzielt werden (siehe
Die
Im Gegensatz zur ersten Variante weist der Längsendenabschnitt 12 bei der zweiten Variante nur eine Stufe 42 auf. Der nicht umgebogene Abschnitt 28 weist im Wesentlichen über seine gesamte Länge hinweg dieselbe Materialdicke wie der umgebogene Abschnitt 26 auf. Erst an seinem Rand (rechts in
Die Materialdicke des umgebogenen Abschnitts 26 entspricht vorzugsweise im Wesentlichen der Hälfte von der Materialdicke der restlichen Folie. Dies hat zur Folge, dass nach dem Umbiegen des Abschnitts 26 und der Befestigung des Abschnitts 26 im Bereich des Befestigungsabschnitts 30 an dem nicht umgebogenen Abschnitt 28 die Naht im Bereich des Befestigungsabschnitts 30 im Wesentlichen dieselbe Materialdicke wie die restliche Folie aufweist.The material thickness of the
Lediglich im Bereich des Kanals für das Verbindungselement 32 weist bei dieser Variante die Naht eine Dicke auf, die um wenigstens der Dicke des Befestigungselements 32 größer als die Dicke der restlichen Folie ist. Dies ist zwar gegenüber der ersten Variante gemäß den
Die
Im Gegensatz zu der ersten Variante und so wie die zweite Variante weist der Längsendenabschnitt 12 der dritten Variante ebenfalls nur eine einzige Stufe 42 auf. Diese entspricht dabei im Wesentlichen der ersten Stufe 42 der ersten Variante, mit Ausnahme der Tatsache, dass die Stufenhöhe größer ist. Tatsächlich entspricht die Materialdicke des nicht umgebogenen Abschnitts 28 im Bereich des Befestigungsabschnitts im Wesentlichen der Materialdicke der restlichen Folie.In contrast to the first variant and like the second variant, the
Ähnlich wie die zweite Variante weist auch die dritte Variante gegenüber der ersten Variante den Vorteil auf, dass der Fertigungsaufwand reduziert werden kann, da lediglich eine Stufe statt zwei Stufen zu fräsen sind. Dafür weist die Naht jedoch eine größere Materialdicke als die restliche Folie auf. Die Dickenzunahme entspricht im Wesentlichen der Materialdicke des umgebogenen Abschnitts 26. Ein weiterer Vorteil der dritten Variante gegenüber der ersten und zweiten Variante besteht darin, dass die Naht im Bereich des Befestigungsabschnitts 30 auf Grund der größeren Materialdicke in diesem Bereich besonders stabil ist.Similar to the second variant, the third variant also has the advantage over the first variant that the manufacturing effort can be reduced because only one step instead of two steps has to be milled. However, the seam has a greater material thickness than the rest of the film. The increase in thickness essentially corresponds to the material thickness of the
Die Bespannung 10' gemäß der weiteren Ausführungsform weist gegenüber den zuvor beschriebenen Ausführungsformen einige Vorteile auf. So können zu ihrer Herstellung Folien verwendet werden, die verhältnismäßig einfach und somit kostengünstig herstellbar sind. Die segmentierte Ausführung der erfindungsgemäßen Bespannung 10` erlaubt es, für das Band Folien mit einer Breite kleiner als 1300mm, vorzugsweise von etwa 1250mm oder weniger zu verwenden, wobei die Abmessung der einzelnen Segmente 40 in Maschinenrichtung MD die Breite der Folienbahnen nicht überschreitet. Beispielsweise kann die Abmessung der Segmente 40 in Maschinenrichtung MD etwa 1900mm oder weniger betragen. Die Abmessung der Segmente 40 in Maschinenquerrichtung CD ist dagegen unkritisch und kann problemlos auf die Breite der Papiermaschine, für deren Verwendung die Bespannung 10' angedacht ist, abgestimmt werden, da die Folien in Bahnen extrudiert werden, die prinzipiell unendlich lang sein können. Die Bespannung 10` weist in der Regel eine Abmessung in Maschinenquerrichtung CD auf, die deutlich größer als 2000mm ist. Somit weisen die einzelnen Segmente 40 bevorzugt eine Abmessung in Maschinenrichtung MD auf, die wesentlich kleiner als ihre Abmessung in Maschinenquerrichtung CD ist. Die Extrusionsrichtung der für die Segmente 40 verwendeten Folie verläuft vorzugsweise im Wesentlichen in Maschinenquerrichtung CD der Bespannung 10`.The covering 10′ according to the further embodiment has some advantages over the previously described embodiments. Films can be used to produce them, which are relatively simple and therefore inexpensive to produce. The segmented design of the covering 10' according to the invention makes it possible to use films with a width of less than 1300 mm, preferably approximately 1250 mm or less, for the band, with the dimension of the
Auch lässt sich eine Folie mit einer Abmessung in Maschinenrichtung MD von weniger als 2000mm verhältnismäßig einfach transportieren und weiter verarbeiten.A film with a dimension in the machine direction MD of less than 2000mm can also be transported and further processed relatively easily.
So lässt sich zum Beispiel eine Anlage zum Einbringen der Perforationen, wie z.B. eine Stanzanlage, relativ einfach herstellen und betreiben.For example, a system for introducing the perforations, such as a punching system, can be manufactured and operated relatively easily.
Ein weiterer Vorteil der segmentierten Ausführung der erfindungsgemäßen Bespannung 10` liegt darin, das bei einer lokalen Fehlstelle während der Produktion oder im Betrieb der Bespannung 10` nicht die komplette Bespannung ausgewechselt werden muss, sondern es ausreicht, lediglich das betroffene Segment 40 auszutauschen. Zudem ergibt sich bei der Herstellung weniger Verschnitt durch die segmentierte Ausführung und es lassen sich Bespannungen unterschiedlicher Länge sehr schnell aus vorgefertigten Segmenten zusammenfügen.A further advantage of the segmented design of the covering 10' according to the invention is that in the event of a local defect during production or operation of the covering 10', the entire covering does not have to be replaced, but rather it is sufficient to simply replace the affected
Die Bespannung 10 der Ausführungsformen gemäß
- 10, 10'10, 10'
- Bespannungcovering
- 1212
- LängsendenabschnittLongitudinal end section
- 1414
- HauptabschnittMain section
- 1616
- LängsendenkanteLongitudinal end edge
- 1818
- gedachte Linieimaginary line
- 2020
- Ausnehmungrecess
- 2222
- Stegweb
- 2424
- Lochreiherow of holes
- 2626
- (umgebogener) Abschnitt(bent) section
- 2828
- (nicht umgebogener) Abschnitt(unbent) section
- 3030
- BefestigungsabschnittFastening section
- 3232
- Verbindungselementconnecting element
- 3434
- Vorsprunghead Start
- 3636
- RücksprungJump back
- 3838
- Nahtbereichseam area
- 4040
- Segmentsegment
- 4242
- (erste) Stufe(first stage
- 4444
- zweite Stufesecond step
- CDCD
- MaschinenquerrichtungMachine cross direction
- MDM.D
- MaschinenrichtungMachine direction
Claims (15)
- Clothing (10, 10') for a machine for producing and/or finishing a material web, in particular a pulp web, such as for example a paper, board or tissue web,wherein the clothing (10, 10') is configured as a belt having two longitudinal end portions (12), at which the belt can be or is closed to form a continuous belt,wherein the belt is formed from a perforated film,wherein a portion (26) of at least one of the two longitudinal end portions (12) is folded over in order to form a channel provided for receiving a connecting element (32), wherein the portion (26) of the at least one longitudinal end portion (12) which was folded over is fastened in the region of a fastening portion (30) to the portion (28) of the at least one longitudinal end portion (12) which was not folded over, and wherein the portion (26) which was folded over, the portion (28) which was not folded over and the fastening portion (30) of the at least one longitudinal end portion (12) are configured in one piece with each other,characterized in that at least the portion (26) of the at least one longitudinal end portion (12) which was folded over has a smaller material thickness than the rest of the film.
- Clothing (10, 10') according to Claim 1,
characterized in that the portion (28) of the at least one longitudinal end portion (12) which was not folded over has a smaller material thickness than the rest of the film at least in the region of the fastening portion (30) . - Clothing (10, 10') according to Claim 2,
characterized in that the material thickness of the portion (26) which was folded over substantially corresponds to the difference between the material thickness of the portion (28) which was not folded over in the region of the fastening portion (30) and the material thickness of the rest of the film. - Clothing (10, 10') according to Claim 2 and 3,
characterized in that the difference between the material thickness of the portion (28) which was not folded over in the region of the fastening portion (30) and the portion (26) which was folded over corresponds at least to a thickness of the connecting element (32). - Clothing (10, 10') according to one of the preceding claims,
characterized in that the portion (26) of the at least one longitudinal end portion (12) which was folded over is fastened in the region of the fastening portion (30) by a material connection, preferably by means of welding, in particular by means of NIR laser welding, to the portion (28) of the at least one longitudinal end portion (12) which was not folded over. - Clothing (10, 10') according to one of the preceding claims,
characterized in that the two longitudinal end portions (12) of the belt are configured in a complementary manner but otherwise substantially identically to one another, wherein both longitudinal end portions (12) in each case have a plurality of projections (34) and indentations (36) which are suitable for coming into or being in toothed engagement with one another, wherein the channel provided for receiving the connecting element (32) is to be formed or is formed by the plurality of projections (34) on the two longitudinal end portions (12). - Clothing (10, 10') according to one of the preceding claims,
characterized in that the belt has a main portion (14) between the two longitudinal end portions (12) and at least one of the two longitudinal end portions (12), preferably both longitudinal end portions (12), is or are configured integrally in one piece with the main portion (14) . - Clothing (10, 10') according to Claim 7,
characterized in that the main portion (14) is free of seam regions. - Clothing (10') according to Claim 7,
characterized in that the main portion (14) is configured in a segmented manner and has at least one seam region which connects two segments (40) to one another. - Clothing (10') according to Claim 9,
characterized in that at least two segments (40), preferably all of the segments (40), are configured substantially identically to one another. - Clothing (10, 10') according to one of the preceding claims,
characterized in that the clothing (10, 10') is a dryer fabric which is suitable for use in a drying section of a paper, board or tissue machine. - Method for producing clothing (10, 10'), preferably clothing (10, 10') according to one of the preceding claims, for a machine for producing and/or finishing a material web, in particular a pulp web, such as for example a paper, board or tissue web, comprising the following steps:- providing a belt made of a perforated film and having two longitudinal end portions (12),- folding over a portion (26) of at least one of the two longitudinal end portions (12) in order to form a channel provided for receiving a connecting element (32) and- fastening the portion (26) of the at least one longitudinal end portion (12) which was folded over to a portion (28) of the at least one longitudinal end portion (26) which was not folded over,characterized in that the material is removed from the film, preferably by milling, before the folding over in the at least one longitudinal end portion (12) so that at least the portion (26) of the at least one longitudinal end portion (12) which was folded over has a smaller material thickness than the rest of the film.
- Method according to Claim 12,
characterized in that the material is removed such that the at least one longitudinal end portion (12) has at least one step (42). - Method according to Claim 13,
characterized in that the material is removed such that the at least one longitudinal end portion (12) has two steps (42, 44). - Method according to one of Claims 12 to 14,
characterized in that the portion (26) of the at least one longitudinal end portion (12) which was folded over is fastened by a material connection, preferably is welded, in particular by means of a laser, to the portion (28) of the at least one longitudinal end portion (12) which was not folded over.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102020113073.2A DE102020113073A1 (en) | 2020-05-14 | 2020-05-14 | Covering and manufacturing process for such a covering |
PCT/EP2021/062132 WO2021228707A1 (en) | 2020-05-14 | 2021-05-07 | Clothing and method for producing clothing of this type |
Publications (2)
Publication Number | Publication Date |
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EP4150150A1 EP4150150A1 (en) | 2023-03-22 |
EP4150150B1 true EP4150150B1 (en) | 2024-02-28 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP21726571.9A Active EP4150150B1 (en) | 2020-05-14 | 2021-05-07 | Clothing and method for producing clothing of this type |
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EP (1) | EP4150150B1 (en) |
DE (1) | DE102020113073A1 (en) |
WO (1) | WO2021228707A1 (en) |
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Publication number | Priority date | Publication date | Assignee | Title |
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DE102022131354A1 (en) | 2022-11-28 | 2024-05-29 | Voith Patent Gmbh | Spiral seam covering and manufacturing process for the same |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010040089A1 (en) | 2010-09-01 | 2012-03-01 | Voith Patent Gmbh | Punched foil covering |
DE102013224684A1 (en) * | 2013-12-02 | 2015-06-03 | Voith Patent Gmbh | Conveyor belt with closing seam |
DE102013215779A1 (en) | 2013-08-09 | 2015-02-12 | Voith Patent Gmbh | Covering with seam connection |
EP3077593B1 (en) | 2013-12-06 | 2018-11-14 | AstenJohnson, Inc. | Non-woven double-layer industrial textile assembled from sleeve configuration panels, and panels therefor |
DE102017114964A1 (en) | 2017-07-05 | 2019-01-10 | Voith Patent Gmbh | Covering and manufacturing process for such a fabric |
-
2020
- 2020-05-14 DE DE102020113073.2A patent/DE102020113073A1/en active Pending
-
2021
- 2021-05-07 WO PCT/EP2021/062132 patent/WO2021228707A1/en unknown
- 2021-05-07 EP EP21726571.9A patent/EP4150150B1/en active Active
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EP4150150A1 (en) | 2023-03-22 |
WO2021228707A1 (en) | 2021-11-18 |
DE102020113073A1 (en) | 2021-11-18 |
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