EP1035251A1 - Dewatering band for paper machines - Google Patents

Abstract

The continuous blanket (1) for a papermaking machine, where water is extracted from the pulp, is composed of a number of lateral plate-shaped bodies (2) linked together by flexible strands (9) which lie along the length of the belt (1). The strand ends are anchored in end pieces (5,6), which are coupled together to form the continuous blanket (1). The end pieces are end bars (5,6), extending over the whole width of the blanket (1). The connecting strands (9) extend over the whole length of the blanket. Each flat body (2) has at least two connecting strands (9) through it. The bodies (2) are in lateral rows, offset against each other, so that the connecting strands pass through the offset bodies (2) in neighboring lateral rows. The bodies (2) have geometric shapes, fitting together as a jigsaw puzzle, as polygons and especially hexagons. They can also have a cross shape. The bodies can be flat rods, assembled to form lateral rows in the blanket with an offset so that the gaps in one row are bridged by the adjacent row. The bodies are strung loosely on the connecting strands, or they are bonded to them by adhesion or pressure. The bodies can have bending hinges, laterally across the blanket. The blanket end pieces (5,6) have eyelet passage channels to take a coupling wire (12) through them when they are in alignment. The end pieces (5,6) have passage openings where water can flow through. The end pieces and/or bodies form two complementary half-sections which are joined together, held by the connecting strands. Each half-section has half-channels on their facing sides to form passages for the connecting strands. The half-sections have couplings for an interlock, or they are bonded together by hot sealing or an adhesive.

Description

The invention relates to a drainage belt, in particular as a dryer for paper machines, which from a Variety of platelet-shaped flat bodies composed is used to adjust the permeability through openings have and / or gaps between them leave blank, the flat body over flexible connecting strands, that penetrate the flat bodies, among themselves are coupled so that in operation on the Longitudinal forces acting on the drainage tape act on them.

Such a drainage belt is DE 37 35 709 A1 remove. There are a lot of this drainage belt provided by flat bodies, which as elongated, flat strips extending in the transverse direction are in the longitudinal direction of the drainage belt arranged one behind the other and by transverse Plug wires are coupled together. Use this the flat bodies alternate with each other, so that aligned Through channels arise in which the plug wires can be inserted.

Such a drainage belt has considerable advantages. The platelet-shaped flat body can be easily and quickly by injection molding or by extrusion getting produced. Let through their combination drainage tapes of almost any length and Make width. Permeability in the thickness direction can be placed in the Flat bodies themselves and / or by providing gaps between the flat bodies precisely and reproducibly the respective requirements are adjusted. Despite this The paper web finds through openings and / or gaps a large-area support, so practical there are no marks on the paper web. Also regarding the thickness of the flat body gives great freedom d. H. it can meet the respective machine requirements be adjusted. Corresponding freedom exists with the Choice of material for the flat body. Come for this Plastics, such as thermoplastics, thermosets and casting resins, in question. However, the flat bodies can also be made of elastomers or even metals. It is also conceivable that not all flat bodies of a drainage belt be made from the same material, so that different materials are provided alternately can.

When developing this type of drainage tapes has been found to be one for all uses sufficient tensile strength could not be achieved, especially if the flat body is made of plastic become. Even reinforcements of the injection molded Flat bodies through glass fibers or the like helped little.

The invention is therefore based on the object of a drainage belt of the type mentioned at the beginning that it is capable of absorbing high longitudinal tensile forces of the drainage belt is suitable.

This object is achieved in that the connecting strands extend in the longitudinal direction of the paper machine clothing extend and with their ends in End pieces are anchored, which can be coupled together are. The basic idea of the invention is therefore based on the longitudinal forces used during operation through connecting strands extending in the longitudinal direction to record. It has been shown that this much higher longitudinal forces than with the drainage belt can be recorded according to the state of the art, by appropriate choice of type, cross-section and the material of the connecting strands Adaptation to the respective requirements is possible.

The connecting strands can, for example, as monofilaments, monofilament threads, untwisted bundles of monofilaments, flat or oval ribbons or the like be, with this type of connecting strands also braided, can be woven or knitted. They can also be coated his. In particular PET, PPS, PEK, PEEK, polysulfone, PEN, thermoplastic aromatic PA and also steel in question. Basically, should the connecting strands at least thermally and chemically be as resilient as the flat body itself.

Anchoring the connecting strands in the end pieces can be done in different ways, for example by welding, gluing, pressing or also by Wrapping. The end pieces can be designed as individual pieces be in which only a connecting strand or a few of which are anchored. But you can also use them as end strips be formed in which a plurality of connecting strands are anchored, the end strips also across the entire width of the drainage belt can extend. The drainage belt can be placed over the end pieces be closed in a simple manner. In this Condition, two end pieces form a seam.

Basically there is the possibility of a drainage belt to be composed of a plurality of sections, wherein each section has end pieces on the end faces that coupled with end pieces of the following section become. In general, however, one becomes the connecting strands along the entire length of the drainage belt let it extend so that only one seam is created.

In a further embodiment of the invention, that the flat body of at least two connecting strands are enforced so that they are perfectly in the band level are guided and cannot tip over. Preferably the flat bodies should have staggered transverse rows form, connecting strands run such that flat bodies of adjacent transverse rows offset from one another push through. This type of networking gives the drainage belt stability in the transverse direction in particular.

The flat body can in their geometric outline design be largely free. Basically they should have geometric shapes that are puzzle-like complete, the flat bodies being identical to one another can be, but need not be. For this come in particular Rectangles, but also polygons, e.g. B. regular Hexagons or cross-shaped flat bodies in question that can have rounded corners.

Deviating from the geometries described above, the Flat body can also be designed as flat bars, of which several each in the transverse direction of the drainage belt arranged side by side to form a transverse row are, the flat bars of two adjacent Cross rows are arranged so that the gaps of one Cross row bridged by flat bars of the other cross row become.

The material for the flat body should be like that of the connecting strands adapted to the respective requirements his. When used as a dryer fabric come in particular heat-resistant materials such as PET, PPS, PEK, PEEK, Polysulfone, PEN, thermoplastic aromatic PA as well Metals like steel or light metal in question. So far Plastics are used, the flat body in Injection molding processes are manufactured.

Otherwise, the flat bodies can also have designs as already described in DE-37 35 709 A1 are, d. H. they can also span the entire width extend the drainage belt and / or as a hollow body be designed to save material and thus weight. The hollow body formation does not have to be closed and can for example be designed so that the Cavities with one another in the transverse and / or longitudinal direction of the strip connected to each other. In these Cavities can be used to store desired materials. The flat body can also consist of a rigid inner support part and a surrounding plastic outer jacket exist, so be layered. It can also be used for the outside and inside of the drainage belt different materials provided his. In addition, laminated or vapor-deposited can also be used Foils can be provided, for example, heat radiation to reflect. Furthermore, flocking or a Coated with foam or nonwoven become.

Basically, there is the possibility of the flat body string loosely on the connecting strands, the Corresponding through holes in the Push through flat bodies. You can also use the Connecting strands connected, for example glued or hot or cold pressed.

According to a further feature of the invention, that the flat body in the transverse direction of the drainage belt Have bending hinges so that they fit better Deflection rollers can adjust, especially if they are relative are formed over a large area. A flat body can also have several such hinges. The bending hinges can be weakened accordingly Material cross section are formed.

It is further provided according to the invention that the end pieces have eyelet-like through-channels through which A coupling wire can be inserted in the aligned position is.

According to the invention it is further proposed that the Have end pieces through which through-openings can flow, the permeability of the drainage tape in particular for steam in the area of the end pieces to that in the rest Adjust areas where permeability is due of through openings in the flat bodies and / or by means of Gaps between these are controlled.

Finally, the invention provides that end pieces and / or flat body composed of two complementary halves are the connecting strands between to lock myself in. To do this, the halves should face each other facing sides half channels for receiving the Have connecting strands. The halves are on both Attach the sides of the connecting strands and then together connected. The connection can be made using adhesive or heat sealing happen. However, it can also Coupling elements can be provided which interlock and lock in place.

Figur 1

eine Draufsicht auf den Nahtbereich eines Trockensiebs gemäß der Erfindung;

Figur 2

eine Draufsicht auf einen Ausschnitt eines weiteren Trockensiebs mit Flachkörpern, die Biegescharniere aufweisen;

Figur 3

eine Draufsicht auf einen Endbereich eines dritten Trockensiebs gemäß der Erfindung;

Figur 4

eine Draufsicht auf den Endbereich eines vierten Trockensiebs;

Figur 5

eine Draufsicht auf den Endbereich eines fünften Trockensiebs;

Figuren 6 bis 13

verschiedene Beispiele von kreuzförmigen Flachkörpern mit Durchgangsöffnungen und

Figur 14

einen zweiteiligen Flachkörper.

In the drawing, the invention is illustrated in more detail using exemplary embodiments. Show it:

Figure 1

a plan view of the seam area of a dryer fabric according to the invention;

Figure 2

a plan view of a section of a further dryer fabric with flat bodies that have bending hinges;

Figure 3

a plan view of an end portion of a third dryer fabric according to the invention;

Figure 4

a plan view of the end portion of a fourth dryer fabric;

Figure 5

a plan view of the end portion of a fifth dryer fabric;

Figures 6 to 13

different examples of cross-shaped flat bodies with through openings and

Figure 14

a two-part flat body.

The drying screen 1 shown in Figure 1 is made of a Plenty of cruciform flat bodies - exemplary designated with 2 - composed. The cutout too seeing flat body 2 each form transverse rows 3, 4 of Flat bodies arranged next to one another in the transverse direction 2, the following each in the longitudinal direction (arrow A) Rows are omitted. The following transverse rows are compared to the transverse rows 3, 4 shown half the width of the flat body 2 offset, so that this Rows in the shown transverse rows 3, 4 like a puzzle in border the way, as in the example according to FIG 2 can be seen.

Between the transverse rows 3, 4 are two end strips 5, 6 provided that extends across the entire width of the dryer fabric 1 extend. The neighboring rows 3, 4 Edges of the end strips 5, 6 are serrated so that they are on the shape of the flat body 2 are adapted, namely in such a way that the protruding in the longitudinal direction Crosspieces - designated by way of example at 7 - in recesses, for example designated 8 - in the end strips 5, 6 mounting.

In the end strips 5, 6 are the ends of 32 connecting strands - designated by way of example with 9 - firmly anchored, by inserting them into appropriate holes and then pressed or glued. The connecting strands 9 each form pairs and run parallel in Longitudinal direction (arrow A). The connecting strands 9 extend from end bar 5 to end bar 6 over the entire length Length of the dryer fabric 1 and enforce it in the band plane extending through holes in the Flat bodies 2, namely 8 connecting strands for each flat body 2 9. Due to the displacement of the flat body 2 runs the part of the connecting strands 9 that in the rows 3, 4 shown the middle of the Flat body 2 interspersed in the not visible here Flat bodies of the following rows by their Edge bars, while vice versa those shown in the Rows 3, 4 going through the edge webs of the flat body 2 Connecting strands 9 the central area of the flat body 2 of the following flat bodies not visible here push through.

The end strips 5, 6 each have eyelet webs - for example denoted by 10, 11 - which in the transverse direction are so offset from each other that they are in the shown overlap when coupled. The Eyelet webs 10, 11 have transversely extending Through holes that are aligned when coupled and are penetrated by a coupling plug wire 12. About this coupling plug wire 12 are the ends of the Dryer screen 1 coupled. The thickness of the end strips 5, 6 the same in all areas, i. H. also the eyelets 10, 11 have the same thickness as the other areas the end strips 5, 6.

Figure 2 shows a section of another dryer fabric 13. It differs from the dryer fabric 1 according to the figure 1 only in that they are also cruciform here trained flat body - designated 14 by way of example - in the middle in the transverse direction of the dryer fabric 13 extending flexible joint - exemplary with 15 designated - have. This makes the dryer fabric 13 smoother when wrapping rollers. The flexibility in the area of the flexible joint 15 can be by appropriate Reduction in the thickness of the flat body 14 in this Area can be effected. Because there are no tractive forces on the Flat body 14 act, rather this from the connecting strands - designated by way of example at 16 - added have, this weakening of the flat body 14th no influence on the tensile strength of the dryer fabric 13.

The embodiment shown in Figure 3 Dryer screen 17 does not have - as in the exemplary embodiments according to Figures 1 and 2 - cruciform, but hexagonal flat body - designated 18 by way of example -, These flat bodies 18 are arranged so that two of their edges are transverse to the longitudinal direction Extend (arrow A). The flat bodies 18 are also here arranged like a puzzle, so that there are gaps between them - exemplified with 19 - result that everywhere have the same width. Is adapted accordingly an end bar 20 with eyelets - for example with 21 designated - is provided. You can therefore in the same Way as in the exemplary embodiment according to FIG. 1 with a complementarily designed end bar on the other End of the dryer fabric 17 are coupled.

The ends of connecting strands are anchored in the end bar 20 - designated by way of example at 22 - that from the end bar 20 shown here to the other, Extend end bar, not shown. Everyone Flat body 18 is on 5 of these connecting strands 20th pressed on, so firmly connected to them. One each of the connecting strands - designated by 23, for example - interspersed the edge area on one side of a flat body 18 and then the edge area on the other Side of a subsequent one, offset transversely to the one arranged flat body 18. In this way, the assignment the flat body 18 stabilized in the transverse direction.

At the two edges of the dryer fabric 17 are to their Straightening matching triangular flat bodies - exemplary designated with 24 - provided. They too will interspersed with connecting strands 23. It goes without saying that such marginal flat gaps filling 24 also in the exemplary embodiments according to FIGS. 1 and 2 can be provided.

The embodiment shown in Figure 4 Dryer screen 25 is also made of regular hexagonal Flat bodies - designated by way of example at 26 - constructed. The flat bodies 26 are, however, opposite the embodiment shown in Figure 3 rotated by 30 °, so that each two opposite edges in The longitudinal direction (arrow A) of the dryer fabric 25 runs. Here, too, are flat bodies on the edge - for example with Designated 27 - provided for a straight edge care and the gaps existing there to complete. To each of the two edges of the dryer fabric 25 is the density of the connecting strands - exemplary designated by 28 - increased to special in this area to ensure good transverse stability. This also has Consequence that the trapezoidal edge flat body 27th are each penetrated by two connecting strands 28, which secures them against tipping around their longitudinal axis. The Connecting strands 28 are also in an end bar here 29 anchored, which one at its free end straight end, but in the same way with eyelets can be provided as in the previously described Embodiments.

In Figure 5 is another embodiment of a Dryer screen 30 shown, namely one end portion. The dryer fabric 30 is made of rectangular, rod-like Flat bodies - labeled 31 and 32, for example - Assembled, the flat bodies 31, 32 transverse rows 33, 34, 35 form. Each transverse row is 33, 34, 35 made of long flat bodies - designated 31 by way of example - And short flat bodies - designated 32 by way of example - Composed so that transverse rows 33, 34, 35 same length and straight side edges of the dryer fabric 30 result. The flat bodies are in each transverse row 33, 34, 35 31, 32 arranged differently, with between the flat bodies 31, 32 each in a transverse row 33, 34, 35 gaps - identified by way of example at 36 - result. The flat bodies 31, 32 are distributed so that the gaps 36 in a transverse row 33, 34, 35 at least in an adjacent transverse row 33, 34, 35 of a flat body 31, 32 is bridged. Because the short flat body 32 of four connecting strands - designated 37 by way of example - And the long flat body 31 of eight connecting strands 37 are enforced, this results a kind of networking of the flat bodies 31, 32 with one another and thus a cross stabilization to each other.

The connecting strands 37 are again in one End bar 38 with eyelet webs - designated 39 by way of example - anchored. The end bar 38 can be the same Way as in the embodiments according to the figures 1 to 3 with a complementary end bar at the other end of the dryer fabric 30 are coupled.

Figures 6 to 13 show cross-shaped flat bodies same size, all of which are labeled 40. she differ in that they have different geometric Forming through holes - exemplary with Designated 41 - have.

In Figure 6, the flat body 40 has circular through holes 41 of the same diameter. The flat body 40 according to FIG. 7 has round, triangular, trapezoidal, square, parallelogram-like and octagonal through holes 41. In the flat body 40 according to FIG. 8 rectangular through holes 41 in a parallel arrangement intended. Has in the embodiment of Figure 9 the flat body 40 again circular through holes 41, but with different diameters. The embodiment 10 has rectangular through holes 41 in a parallel arrangement, centered a rectangular through hole 41 transverse thereto is provided. In Figure 11, the flat body 40 has pentagonal Through holes 41 and square in Figure 12 Through holes 41 in a regular distribution. The embodiment 13 contains star-shaped Through holes 41.

It is understood that to adjust the permeability a dryer fabric also any other embodiments and arrangements of through holes 41 in Question come, the flat body 40, from which a Drying screen is composed, not identical have to be, but different types of Through holes 41 may have to the permeability of the dryer fabric also differ in some areas shape.

FIG. 14 shows a further, cross-shaped flat body 42 shown in perspective. It consists of two complementary ones Flat body halves 43, 44 that are spaced apart are shown and facing each other Side half-channels - labeled 45 and 46, for example - exhibit.

The lower flat body half 44 has four coupling pins 47, 48, 49, 50 on that of the upper half of the flat body 43 stand vertically on the facing side. The upper flat body half 43 has - which can not be seen here is - matching mounting holes, with the coupling pins 47, 48, 49, 50 and the mounting holes so are designed so that both lock together when the Flat body halves 43, 44 are placed one on top of the other.

The flat body halves are used to mount the flat body 42 43, 44 from both sides to those not shown here Line wires laid out so that they are included in the Half channels 45, 46 can be found. When pressing together the flat body halves 43, 44 complement the half channels 45, 46 to the full channels receiving the longitudinal wires, the coupling pins 47, 48, 49, 50 and the receiving bores for a firm hold of the flat body 42 the longitudinal wires due to friction.

Claims (19)

Drainage belt (1, 13, 17, 25, 30), in particular as a dryer fabric for paper machines, which is composed of a large number of plate-shaped flat bodies (2, 14, 18, 24, 26, 27, 31, 32, 40) which are used for Setting the permeability has through-openings (41) and / or leave gaps (19, 36) between them, the flat bodies (2, 14, 18, 24, 26, 27, 31, 32, 40) via flexible connecting strands (9, 16 , 22, 23, 28, 37), which penetrate the flat bodies (2, 14, 18, 24, 26, 27, 31, 32, 40), are coupled to one another in such a way that they operate on the dewatering belt (1, 13 , 17, 25, 30) acting longitudinal forces on them, characterized in that the connecting strands (9, 16, 22, 23, 28, 37) extend in the longitudinal direction of the drainage belt (1, 13, 17, 25, 30) and are anchored with their ends in end pieces (5, 6, 20, 29, 38) which can be coupled together. Drainage belt according to claim 1, characterized in that the end pieces are designed as end strips (5, 6, 20, 29, 38). Drainage belt according to claim 2, characterized in that the end strips (5, 6, 20, 29, 38) extend over the entire width of the drainage belt (1, 13, 17, 25, 30). Drainage belt according to one of claims 1 to 3, characterized in that the connecting strands extend over the entire length of the drainage belt (1, 13, 17, 25, 30). Drainage belt according to one of claims 1 to 4, characterized in that the flat bodies (2, 14, 18, 26, 27, 31, 32, 40) are penetrated by at least two connecting strands (9, 16, 22, 23, 28, 37) are. Drainage belt according to one of claims 1 to 5, characterized in that flat bodies (2, 14, 18, 26, 27, 40) form transverse rows (3, 4) offset from one another, connecting strands (9, 16, 22, 23, 28) run in such a way that they penetrate flat bodies (2, 14, 18, 26) of adjacent transverse rows which are offset from one another. Drainage belt according to Claims 1 to 6, characterized in that the flat bodies (2, 14, 18, 26, 27, 31, 32, 40) have geometric shapes which complement each other like a puzzle. Drainage belt according to one of claims 1 to 7, characterized in that the flat bodies (2, 14, 18, 26, 27, 31, 32, 40) are designed as polygons, in particular as regular hexagons. Drainage belt according to one of claims 1 to 7, characterized in that the flat bodies (2, 14, 40) are cruciform. Drainage belt according to one of claims 1 to 6, characterized in that flat bodies are designed as flat bars (31, 32), of which several are arranged side by side in the transverse direction of the drainage belt (30) to form a transverse row (33, 34, 35), wherein the flat bars (31, 32) of two adjacent transverse rows (33, 34, 35) are arranged such that the gaps (36) of one transverse row (33, 34, 35) of flat bars (31, 32) of the other transverse row (33 , 34, 35) are bridged. Drainage belt according to one of claims 1 to 10, characterized in that the flat bodies are loosely lined up on the connecting strands. Drainage belt according to one of claims 1 to 10, characterized in that the flat bodies (2, 14, 18, 24, 26, 27, 31, 32, 40) with the connecting strands (9, 16, 22, 23, 28, 37) connected, in particular glued or pressed. Drainage belt according to one of claims 1 to 12, characterized in that flat bodies (14) have bending hinges (15) extending in the transverse direction of the drainage belt (13). Drainage belt according to one of claims 1 to 13, characterized in that the end pieces (5, 6, 20, 38) have eyelet-like through-channels through which a coupling wire (12) can be inserted in the aligned position. Drainage belt according to one of claims 1 to 14, characterized in that the end pieces have through-openings which can be flowed through. Drainage belt according to one of claims 1 to 15, characterized in that end pieces and / or flat bodies (42) are composed of two complementary halves (43, 44) which enclose the connecting strands between them. Drainage belt according to claim 16, characterized in that the halves (43, 44) have half-channels (45, 46) on the mutually facing sides for receiving the connecting strands. Drainage belt according to claim 16 or 17, characterized in that the halves (43, 44) have coupling elements (47, 48, 49, 50) which engage in one another and thus connect the halves (43, 44). Drainage belt according to one of claims 16 to 18, characterized in that the halves (43, 44) are connected to one another by heat sealing or gluing.

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