MXPA00002466A - 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

DEHYDRATION BAND, ESPECIAI-MIND DRY SIZE DESCRIPTION OF THE INVENTION The invention relates to a band of dehydration or removal of water, especially a drying screen, for paper machines, which is composed of a multiplicity of flat bodies in form of plaguitas, which have passage openings for the adjustment of the permeability and / or inter-recesses, where the flat bodies by means of flexible connecting strips, which pass through the flat bodies are coupled together in such a way that they cause forces longitudinal that act during the operation on the band of dehydration or withdrawal of water. Such a dehydration band is known from DE 37 35 709 Al. In this dewatering band a multiplicity of planar bodies are provided, which are constructed as flat slats extending in the transverse direction, which are arranged one behind the other in the longitudinal direction of the dewatering band and are coupled together by lacy wires running transversely. To this end, the flat bodies are gripped with one another in turn, so that aligned passage channels are produced, in which the fitting wires can be fitted. Such a band of dehydration has remarkable advantages. The flat bodies in the form of plates can REF. : 32688 simply and quickly manufactured by injection molding or by means of an extrusion process. Due to their combination, dehydration bands of almost any length and width can be manufactured. The permeability in the direction of the thickness can be precisely and reproducibly adjusted with the aid of passage openings defined in the same plane body and / or by providing gaps between the flat bodies, according to the corresponding requirements. Despite these openings, and / or gaps, the band or strip of paper finds a large surface support, so that practically no paper marking occurs. Also with regard to the thickness of the flat bodies there is great freedom, that is, they can be adjusted to the requirements of the corresponding machining. Equal freedom are presented for the selection of material for flat bodies. For this, synthetic materials, such as thermoplastics, duroplasts, and cast resins, come into consideration. However, flat bodies can also be made of elastomers or even metals. Here it is also conceivable, that not all the flat bodies of a dehydration band are made of the same material, so that different materials can be provided in an alternate manner. In the development of these dewatering belts, it has been assumed that sufficient tensile strength for all application purposes can not suffice, especially if the flat bodies are made of synthetic material. Even the reinforcements of the flat bodies by injection molding by glass fibers or the like do little to help. The invention proposes the task of constructing a dewatering band of the type mentioned at the beginning which is suitable for taking up high tension forces in the longitudinal direction of the dewatering band. This task is solved according to the invention because the binding strips extend in the longitudinal direction of the tension in the paper machine and with their ends anchored in end pieces, which are engageable with each other. The basic thought of the invention is as follows, the longitudinal forces which are applied to the dewatering band during operation receive them by joining strips extending in the longitudinal direction. It has been shown that in this way, longitudinal forces substantially higher than those of the dewatering band according to the state of the art can be received, whereby a corresponding selection of the type of the cross section and the material of the strips of Union, an adjustment to the corresponding requirements is possible. The bonding strips can be constructed, for example, as monofilaments, monophilic twists, untwisted bundles of monofilades, flat or oval strips or the like, where this type of binding strips can also be woven, woven or processed. They can also be coated as materials, especially PET, PPS, PE, PEEK, Polysulfonic, PEN, aromatic thermoplastic PA and also steel. Basically the joining strips must be thermally and chemically chargeable at least as much as the flat bodies. The movement of the joining strips in the end pieces can happen in different ways, for example by welding, glue pressing or also by lashing. The end pieces can be constructed as individual pieces in which only one strip or few joints are anchored or anchored. They can also be constructed as end battens in which a multiplicity of joining strips can be anchored, where the strips or end battens can also extend over the entire width of the dewatering band. On the end pieces the dewatering band can be closed easily, in this state two end pieces each form a seam. Basically there is the possibility of composing a dehydration band from a multiplicity of partial pieces where each partial piece has end pieces on the front side that are coupled with the end pieces of the next partial part. In general, the binding strips are allowed to stretch over the entire length of the dewatering band, so that only a seam occurs. In a further embodiment of the invention, it is provided that the flat bodies are crossed by at least two connecting strips, with which they are easily introduced into the plane of the strip and can not be twisted. Preferably, the flat bodies must form transverse rows displaced from each other where the joining strips run in such a way that they pass through flat bodies displaced from each other in neighboring cross sections. This type of crosslinking gives the dewatering band especially in the transverse direction great stability.

The flat bodies can be manufactured in their geometric peripheral shape in a largely free manner / basically they must have geometric shapes that are increased in the form of a puzzle (jigsaw) where the flat bodies can be identical to each other, but do not need to be. Rectangles, but also polygons, for example, regular hexagons or flat bodies of circular shape, which may have rounded corners, are especially suitable for this.

By deviating from the above-described geometries, the flat bodies can also be constructed as flat bars, of which several times each will be arranged in the transverse direction of the dehydration band one next to the other forming a transverse row, where the flat bars of two neighboring transverse rows are arranged in such a way that the voids or voids of a transverse row of flat bars bridge the flat bars of the other transverse row. The material for the flat bodies must be adapted as that of the connecting strips to the respective requirements. In a particular application as a drying screen, heat-fixed materials such as PET, PPS, PEK, PEEK, PEEN polysulphonic, aromatic thermoplastic PA, as well as metals such as steel or light metal are particularly suitable. While synthetic materials can be used, flat bodies can be manufactured by injection casting methods. In general, the flat bodies can also present conformations as already described in DE 37 35 709 Al, this can also extend over the entire width of the dewatering band and be formed as hollow bodies, in order to save material and decrease the weight. Here the formation of the hollow bodies must not be closed and may for example be shaped so that the hollow spaces are one below the other in the transverse direction of the strip and in the longitudinal direction of the strip being in union with the one. another, in these hollow spaces can be placed certain desired materials. The flat bodies can also consist of a rigid internal carrier part and an outer jacket of synthetic material that surrounds it, thus they can be constructed in the form of layers. Here also different materials can be used for the external and internal side of the dewatering belt. Additionally, coated or metallized sheets (6) can be used, for example to reflect the heat radiation. In addition, fleeces or a covering with foamed material or fiber fleece may be provided. Basically there is the possibility of accommodating the loose flat bodies on the joining strips, where the joining strips pass through corresponding passage holes in the flat bodies. But they can also be joined with the joining strips, for example stuck or pressed in hot or cold. According to another characteristic of the invention, it has been provided that the flat bodies in the direction of the dewatering band have hinges, whereby they can be better adjusted to the transport rollers, especially if they are built with a large surface.

A flat body can also present several of these flexing hinges. The flexural hinges can be formed by a corresponding weakening of the cross section of the material. Furthermore, according to the invention, the end pieces have passageways in the form of a needle eye, through which a coupling wire is mounted in an aligned position. According to the invention, it is further provided that the end pieces have current-accessible passage openings to adjust the permeability of the dewatering band, especially for the steam in the area of the end pieces to that existing in the usual regions, where the The permeability of the passage openings is controlled in the flat bodies or by means of the gaps or gaps between them. The invention finally seeks, that the end pieces or the flat bodies are composed of two complementary halves that enclose the connecting bars together. For this, they must present the halves on the sides between opposite semi-channels to receive the binding strips. The halves are placed on both sides of the joint strips and then they are joined together. The connection can be made by means of glue or hot sealing. However, coupling elements can also be provided that grip each other, and thus fit together. In the drawing, the invention is explained in detail, by means of exemplary embodiments. Sample: Figure 1, a plan view in the sewing zone of a drying screen according to the invention, Figure 2, a plan view of a ion of another drying screen with flat bodies having flexing hinges , Figure 3, a plan view of an end zone of a third drying screen according to the invention, Figure 4, a plan view of the end zone of a fourth drying screen, Figure 5, a view of plant of the extreme zone of a fifth of sieve of drying, Figures 6 to 13, different examples of flat bodies in cross with openings of passage and Figure 14, a flat body in two parts. The drying screen 1, shown in FIG. 1, consists of a multiplicity of flat cross-shaped bodies indicated by the figure 2. In the ion of the visible flat bodies 2, transverse rows 3 are formed each time, 4, of flat bodies 2, arranged next to one another in transverse direction, where each time in the longitudinal direction (arrow A), following rows are left. The following transverse rows are offset with respect to the transverse rows shown 3, 4, in half the width of the planar bodies 2, so that these rows in the transverse rows 3, 4, are seen as puzzles as seen in FIG. example according to Fig. 2. Between the transverse rows 3, 4, two end strips 5, 6 are provided which extend over the entire width of the drying screen 1. The edges of the end strips 5, 6 neighboring the transverse rows 3, 4 are toothed in such a way as to conform to the shape of the flat bodies 2, and precisely in such a way that the rods protruding in the longitudinal direction - by way of example indicated with the figure 7, they grip in recesses indicated by way of example with the figure 8, in the final strips 5, 6. In the final strips 5,6 the ends of 32 union strips indicated by way of example with the figure 9 are fixedly anchored, which they are applied in corresponding holes and then they have been pressed or pasted. The connecting strips 9, each time form pairs and run parallel in the longitudinal direction (arrow A). The connecting strips 9, extend from the end strip or strip 5, to the end strip 6, over the entire length of the drying screen 1, and thus pass through in the band plane the through holes in the flat bodies 2, and precisely for each flat body 2, eight connecting strips' 9.

Owing to the displacement of the flat bodies 2, the part of the connecting strip 9 runs, which in the rows 3, 4, crosses the central region of the flat bodies 2, in the flat bodies not visible here of the rows each following times through their edge rods, while inversely in the rows represented 3, 4, the connecting strips 9, which run through the edge rods of the flat bodies 2, traverse the central region of the body plane 2, of the following flat bodies that are not visible here. The end battens 5, 6 each time have ear rods, for example, marked with the figures 10, 11, which in the transverse direction are displaced against each other in such a way that in the coupled condition shown they overlap in a of teeth. The ear rods 10, 11 have transverse holes in the transverse direction which are aligned in the coupled state and are crossed by a coupling wire 12. Through this coupling wire 12, the ends of the drying screen 1 are coupled. , here the thickness of the strips 5, 6 is the same, in all the zones, this is also the ear rods 10, 11, they have the same thickness as the other zones of the strips 5, 6.

Fig. 2 shows a section of another drying screen 13. It differs from the drying screen 1, according to Fig. 1, only in that the flat bodies here constructed in the form of a cross and indicated with the number 14, centrally have a flexure articulation extending in the transverse direction of the drying screen 13, articulation marked with the figure 15, this makes the drying screen 13, slipping by the cylinders is more slippery. The bending in the region of the bending joint 15 can be caused by a decrease in the thickness of the flat body 14 in this region. Since no tensile force acts on the flat bodies 14, multiple can be taken from these by the connecting strips which are indicated by the figures 16, this weakening of the bodies 14 not having any influence on the tensile strength of the screen 13. The drying example 17, as shown in FIG. 3, does not have, as in the exemplary embodiment according to FIGS. 1 and 2, cross-shaped, but hexagonal bodies indicated by way of example with the figure 18 are presented, where these flat bodies 18 are arranged in such a way that each time two of their edges extend transversely to the longitudinal direction (arrow A). Also here are the flat bodies 18, arranged in the form of puzzles, so that between them there are gaps, by way of example indicated with the figure 19, which have the same width. Correspondingly, an end strip 20 is also fitted, which is provided with ear rods marked with the figure 21. It can, like in the example of embodiment according to FIG. 1, be coupled with an end strip constructed in complementary fashion at the other end of the cable. drying screen 17. In the end strip 20, the ends of the connecting strips 22 are anchored, which extend from the end battens 20, shown here to the other end battens, not shown. Each flat body 18 is pressed on five of these connecting strips 20, and thus fixedly joined thereto. Each time a connecting strip marked with the figure 23, crosses the edge area on one side of a flat body 18, and finally the edge area of the other side of a flat body 18, following which is disposed transversely displaced, of this In this way, the coordination of the planar bodies 18 is stabilized in the transverse direction. For the two edges of the drying sieve 17, triangular adjustable flat bodies marked with the figure 24 have been provided for their graduation. Here too, they are crossed by connecting strips 23. It is understood that such flat bodies 24, which fill the Voids on the edge sides could also be provided in the exemplary embodiments according to FIGS. 1 and 2. In the exemplary embodiment shown in FIG. 4, of a dry screen 25, it has also been constructed by means of regular hexagonal planar bodies indicated by way of example with the figure 26. The flat bodies 26 are here rotated with respect to the exemplary embodiment according to FIG. 3, by 30 °, so that each time two opposite edges run in the longitudinal direction (arrow A), of the drying screen 25. Also here flat bodies 27 have been provided, On the edge side they take care of a straight edge closure and they fill in by adjusting to the existing gaps. Each time at both edges of the drying screen 25, the density of the bonding strips, indicated with the number 28, increases, so that in this area a good transversal stability is maintained. This also has the consequence that the flat bodies 27, in the form of a trapezoid on the edge side, each time are crossed by two connecting strips 28, which ensures against an oscillation or inclination around their longitudinal axis. The connecting strips 28 are here also anchored in an end strip 29, which at their free end have a straight connection, however they can also be provided in the same manner with ear rods, as in the embodiments that have been used. previously described. In Fig. 5, another embodiment of a dry screen 30 is represented, and precisely in its end zone. The drying screen 30, is composed of flat bodies in the form of rectangular bars marked with figures 31, 32, where the flat bodies 31, 32, form transverse rows 33, 34, 35. Each transverse row 33, 34, 35, is composed of long bodies marked with the figure 31, and short flat bodies indicated by way of example with the figure 32, in such a way that transversal rows 33, 34 and 35 of equal length and straight side edges of the drying screen 30 are produced. In each transverse row 33, 34 and 35, are the flat bodies 31, 32, placed differently, where between the flat bodies 31, 32, in each of the hollow rows 33, 34, 35. The flat bodies 31, 32, are distributed in such a way that the gaps or voids 36 in a transverse row 33, 34, 35 are bridged at least in a neighboring transverse row 33, 34, 35, by a body p lano 31, 32. Since the short flat bodies 32are crossed by four connecting strips 37, and the long flat bodies 31 are crossed by eight connecting strips 37, this produces a type of crosslinking of the flat bodies 31, 32, with each other and with this a transverse stabilization between yes. The connecting rods 37 are here again anchored in an end strip 38, with ear rods 39. The end cleat 38 can be coupled in the same way as in the embodiment examples according to Figs. 1 to 3, with a complementary end strip at another end of the drying screen 30. Figs. 6 to 13, show flat bodies in the form of a cross of the same size, which together are marked with the figure 40, it differs between them because it has different geometric shapes of the passage holes, by way of example indicated with the figure 41. In Fig. 6 presents the flat body 40, through holes 41, of the same diameter, the flat body 40, according to Fig. 7, has passage holes 41, round, triangular, trapezoidal, quadratic, in the form of parallelogram and octagonal. In the flat body 40, according to Fig. 8, passage holes 41 are provided, in a parallel arrangement. In the exemplary embodiment according to FIG. 9, the flat body 40 has, again, through holes 41, in a circular shape, but with different diameters. The exemplary embodiment according to FIG. 10 has rectangular through-holes 41, in a parallel arrangement, where a step hole 41, which runs transversely transversely, has been centrally provided. In Fig. 11, the flat body 40, holes 41, pentagonal and in Fig. 12, have step holes 41, quadratic in a regular distribution. The exemplary embodiment according to FIG. 13 contains passage holes 41, star-shaped.

It is understood that for the adjustment of the permeability of a drying screen also other embodiments and arrangements that are desired of the passage holes 41 are considered, wherein the flat bodies 40, of which a drying screen is composed , they do not need to be formed identically, but they can have different kinds of passage holes 41 for varyingly forming and also per regions the permeability of the drying screen. In Fig. 14, another flat cross-shaped body 42 is represented in perspective. It consists of two complementary flat-plane halves 43, 44, which are represented at a certain distance from each other and which have on opposite sides semi-channels marked with the figures 45, 46. The lower half of the flat body 44 has four coupling pins 47, 48, 49 and 50, which extend upwards from opposite sides of the upper halves 43, of the flat bodies. The upper halves 43, of the flat bodies have - here no adjustment take-up holes are seen, where the coupling pins 47, 48, 49, 50, and the tap holes are so shaped that they both fit between yes, if the flat body halves 43, 44, remain one above the other. For the assembly of the flat bodies 42, the flat body halves 43, 44 are placed on both sides in longitudinal wires that are not shown here, which find place in the semi-channels 45, 46. In a compression between each other the halves 43, 44 of the flat bodies increase or enlarge the semi-channels 45, 46, to complete channels receiving the longitudinal wires, where the coupling pins 47, 48, 49, 50, and the tap holes, take care of a fixed stop of the flat body 42, in the longitudinal wires by means of a friction closure. It is noted that in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the products to which it refers.

Claims (19)

1. CLAIMS Having described the invention as above, it is claimed as property that contained in the following: 1. The invention relates to a band of dehydration or removal of water, especially a drying screen, for paper machines, which is composed of a multiplicity of flat bodies in the form of plates, which have passage openings for the adjustment of the permeability and / or inter-recesses, where the flat bodies by means of flexible connection strips, which pass through the flat bodies are coupled to each other in such a way, that they cause longitudinal forces acting during operation on the dewatering or water removal band, characterized in that the binding strips extend in the longitudinal direction of the dewatering band and with their ends are anchored in the end pieces. , which are dockable with each other.
2. 2. Dehydration band according to claim 1, characterized in that the end pieces are constructed as end battens.
3. 3. Dehydration band according to claim 2, characterized in that the end battens extend over the entire width of the dehydrating band.
4. 4. Dehydration band according to claims 1 to 3, characterized in that the binding strips extend over the entire length of the dewatering band.
5. 5. Dehydration band according to one of claims 1 to 4, characterized in that the flat bodies are crossed by at least two connecting strips.
6. 6. Dehydration band according to one of claims 1 to 5, characterized in that the flat bodies form alternating cross-sectional series, where the connecting strips run in such a way that the bodies alternated with each other cross neighboring transverse series.
7. 7. Dehydration band according to claim 1 to 6, characterized in that the flat bodies, have geometric shapes, which are complemented in the form of puzzles.
8. 8. Dehydration band according to claim 1 to 7, characterized in that the flat bodies are constructed as polygons, especially as regular hexagons.
9. 9. Dehydration band according to claim 1 to 7, characterized in that the flat bodies are constructed as cross-shaped
10. 10. -Dehydration band according to claim 6, characterized in that the flat bodies, they are constructed as planar bars, of which several times are arranged in the transverse direction of the dewatering band, forming a transverse series, where the flat bars of two neighboring rows are arranged in such a way that the gaps or spaces of a of the transverse rows are bridged by the flat bars of the other transverse row.
11. 11. Dehydration band according to claim 1 to 10, characterized in that the flat bodies are sharpened loose in the connecting strips.
12. 12. - Dehydration band according to one of claims 1 to 10, characterized in that the flat bodies are joined with the connecting strips, especially are glued or pressed.
13. 13. - Dehydration band according to one of claims 1 to 12, characterized in that the flat bodies are understood in the transverse direction of the dewatering band, and have flexing hinges.
14. 14. Dehydration band according to one of claims 1 to 13, characterized in that the end pieces have passage channels in the form of lugs, through which a coupling wire is snapped into the aligned position.
15. 15. Dehydration band according to one of claims 1 to 14, characterized in that the end pieces have path openings that can be traversed by a current.
16. 16. Dehydration band according to one of claims 1 to 15, characterized in that, the end pieces and / or the flat bodies are composed of two complementary halves, which enclose the connecting strips between them.
17. 17. Dehydration band according to one of claims 1 to 15, characterized in that the halves present in the channels between them semi-channel opposites for the taking of the connecting strips.
18. 18. - Dehydration band according to claim 16 or 17, characterized in that the halves have coupling elements, which grip each other and thus join the halves.
19. 19. Dehydration band according to claim 16 or 17, characterized in that the halves are joined by hot sealing or glue together.