MXPA98008477A - Laminated integrally woven papermaker's fabric - Google Patents

Abstract

A laminated integrally woven on-machine papermaker's fabric (10) includes two single-layer woven fabric plies sharing a common machine-direction (MD) yarn (20, 20'). The common MD yarn, which is the weft yarn on the loom during a modified endless weaving technique, forms seaming loops (18) which join the plies together at their ends. Solvent-removable binder yarns (22) interconnect the two plies, which are integrally woven. After weaving, the binder yarns are removed through dissolution with a solvent, yielding the laminated structure. A batt of staple fiber material (36) may be needed into and through the laminated structure. The papermaker's fabric may be used as a forming, press or dryer fabric, or as a base for a polymer coated, paper industry process belt, such as a long nip press, sheet-transfer or calender belt.

Description

LAMINATED FABRIC, INTEGRALLY WOVEN, TO MANUFACTURE PAPER Background of the Invention 1. Field of the Invention The present invention relates to papermaking techniques. More specifically, the present invention is a papermaking fabric for use in the pressing section of a paper machine, such a fabric is commonly known as press fabric, as well as for use on other sections of a paper machine and in other paper manufacturing applications, and a method to manufacture such a fabric. In particular, the papermaking fabric is of the WHO * variety (which can be sewn on the machine) and has a multilayer laminated base. 2. Description of the Prior Art During the papermaking process, a fibrous network is formed by depositing a fibrous suspension, i.e., an aqueous dispersion of cellulose fibers, on a movement forming fabric in the forming section of a machine. paper. A large amount of water is drained from the suspension through the forming fabric during this process, leaving the fibrous web on the surface of the forming fabric. The newly formed cellulosic fiber network proceeds from the forming section to a pressing section, which includes a series of clamping points of a press. The cellulosic fiber web passes through the clamping points of the press supported by a press fabric, or, as is often the case, between two such press fabrics. At the points of attachment of the press, the cellulosic fiber network is subjected to compressive forces which squeeze water from it, and which adhere the fibers in the network to each other to transform the cellulosic fiber network into a sheet of fiber. paper. The water is accepted by the press fabric or fabrics and, ideally, does not return to the sheet of paper. The sheet of paper finally proceeds to a drying section, which includes at least one series of rotating drying drums or cylinders, which are heated internally by steam. The newly formed web or sheet of paper, itself, is directed in a sinuous path sequentially around each of the drums in series by means of a drying fabric, which holds the net very close to the surface of the drums. The hot drums reduce the water content of the fabric to a desirable level through evaporation.

It should be noted that the forming, pressing and drying fabrics all take the form of an endless circuit and function in the form of conveyors. It should also be noted that papermaking is a continuous process which proceeds at considerable speed. That is, the fiber suspension is continuously deposited on the forming fabric in the forming section, while a freshly manufactured paper sheet is continuously wound onto rolls after they leave the drying section. The press fabrics used to wrap the press section are crucial components in the papermaking process. One of its functions is to support and transport the paper product that is being manufactured through the fastening points of the press. In this regard, the fabric serves as a conveyor belt during the manufacturing process. The press fabric also takes part in the finished surface of the paper sheet. That is to say, that the surface of the press fabric is designed to be smooth and uniformly elastic, so that, in the course of passing through the clamping points of the press, a smooth, free surface is imparted. marks to paper.

Perhaps more importantly, the press fabrics accept large quantities of water drawn from the wet paper web at the press clamping point. To satisfy this function, there must literally be somewhere in the fabric where the water can go (empty volume), and the fabric must maintain adequate water permeability and an acceptable porosity and void volume throughout its useful life. Contemporary press fabrics are available in a wide variety of styles designed to meet the requirements of the paper machines on which they are installed for the grades of paper that are manufactured. In general, they comprise a woven base fabric in which a block of fibrous material of fine, non-woven fibrous material has been sewn. The base fabrics can be woven from single filament yarns, from a single bent filament, from multiple filaments or bent multiple filaments, and can be single layer, multiple layers, multiple folds or laminated. The threads by themselves are typically extruded from any one of synthetic polymer resins, such as polyamide and polyester resins, used for this purpose by those skilled in paper machine wrapping techniques.

In recent years, interest in press fabrics having laminated base fabrics has been increasing. Base fabrics of this type comprise two or more layers of fabric, with one or more endless internal layers being placed inside an endless outer layer, the inner and outer layers are joined together by the fibrous material of the fibrous material block. sewn through it. Although laminated base fabrics allow the use of a variety of wavy patterns in the individual base fabric layers, and produce a smoother pressing fabric with a larger void volume, it is difficult to manufacture base fabric layers that fit adequately in dimensions and appearance and quality In addition, press fabrics having laminated base fabrics and comprising two or more fabric layers are usually stiffer than their integrally woven counterparts due to the increase in the total number of yarns in machine transverse direction (CD). The difficulty of producing a press fabric having a laminated base fabric that satisfies the requirements of uniformity, elasticity and adequate vacuum volume is further aggravated when it is desired to manufacture such a fabric sewn on the machine. At one time, it should be remembered, that pressing cloths were supplied only in endless form. One method used was to weave them in the form of an endless loop, without seams by a process known as endless weaving. In addition, the conditions in the press section present additional special requirements that have to be satisfied to use a sewn, workable press fabric. In short, these special requirements arise because the sewn region must behave under load, that is, under compression in the point or points of subjection of the press, like the rest of the press fabric, and because the The stitched region must have the same permeability to water and air as the rest of the press fabric, to avoid periodic marking of the paper product being manufactured by the stitched region. Despite its considerable obstacles, it is still highly desirable to develop a press fabric that can be sewn onto the machine, due to the comparative ease and security with which it can be installed over the pressing section. Finally, these obstacles were overcome with the development of OMS® products (which can be sewn on the machine) and SEAMTEACH® by Albany International. These products include a seam formed by providing seam rings on the opposite transverse edges at both ends of the machine. cloth. The sewing rings by themselves are formed by the threads in the direction of the machine (MD) of the fabric. The bolt seam is formed by placing the two ends of the press fabric together, interlacing the seam rings on the two ends of the fabric, and directing a so-called pin or bolt stitch, through a passage defined by the seam rings interlaced to hold the two ends of the press fabric. Needless to say, it is much easier and less time consuming to install a OMS press fabric on a paper machine and install an endless press fabric there. OMS® is a registered trademark of Albany International Corp. v One method of producing a press fabric that can be attached to the paper machine with a "bolt stitch" is to knit the fabric flat, then knit the ends rolled back of the fabric in a direction parallel to the coiled threads. Another technique, even more preferable, is a modified form of the endless fabric, which normally provides a continuous ring of fabric. In the modified endless fabric, the weft yarns are continuously woven back and forth through the loom, forming in each pass a mesh over the edges of the fabric being woven. When the weft yarn, which eventually becomes the yarn in the machine direction (MD) in the press fabric, it is continuous, the sewing rings obtained in this way are stronger than any that can be produced in a flat woven fabric. Although sewn press fabrics have been successfully used for many years, it has proven difficult to use these sewing techniques on laminated press filters. In a laminated press fabric of the prior art, a standard two-ply base fabric with a seam of the type that can be sewn onto the machine was used. On top of this two-layer base fabric, an endless base fabric of a different construction was placed. Alternatively, this additional base can be woven flat and with edges attached to stops on the seam area of the two-ply base fabric. The two fabrics of the base fabric are then laminated together by stitching them into a block of fibrous fiber cut material. However, to open the laminated fabric for installation on a paper machine, one of the final processing steps is to cut through the block of stitched fibrous material, and the machine direction yarns of the upper base fabric layer , where the upper base fabric layer is endless. Because the yarns in the machine-transverse direction of the upper base fabric layer are not perfectly straight across the top of the laminated fabric, ie, exactly perpendicular to the seam rings of the outer layer. the base fabric that can be sewn on the machine, across the width of the fabric, some threads in cross machine direction will be cut in this step of the process. As a consequence, the ends or lengths of the yarn in the machine direction and in the cross machine direction in the base fabric layer of the upper part will be shortened, which can migrate towards the seam ring area of the fabric layer. base that can be sewn on the machine. When the fabric is installed on the press of the paper machine, which requires that the seam rings become entangled together, those ends or short yarn lengths may get caught in the seam area and cause problems in the interlacing of the rings. sewing. They can also block or obstruct the path taken by the bolt or bolt used to keep the seam circuits interlaced together to 'close the seam. This makes the installation more difficult and time consuming, and more expensive in terms of an increase in unproductive machine time and loss of production. One method used to avoid this problem is to remove some threads in the cross machine direction of the upper fabric base layer before sewing. These threads are "removed" from the upper base fabric layer in the region that covers the seam rings of the lower base fabric layer, although this eliminates the possibility of accidentally cutting through the threads in the machine's transverse direction and cause the problems discussed in the preceding paragraph, gives the seam area a more pronounced mass and a gauge difference under load relative to the rest of the fabric.This difference can lead to an objectionable seam mark, and / or a "jump" of sewing. "Another way to eliminate this problem is to fabricate both base layers of the type that can be sewn onto the machine, their seams can be aligned one above the other, or slightly offset in relation to each other in a longitudinal direction, and both laminated bases During the application of the block of stitched fibrous material, although this can be done with multiple layer bases, it is difficult to do so with single-layer bases, which they are difficult to provide with seams that can be sewn on the machine that have the same porosity and thickness under load as the rest of the fabric. In any case, each layer of base fabric in the laminated press fabric would have to be closed separately. Not only is it physically difficult to separate the seam, of the base fabric layers intimately bonded in this manner, but that the seam region thus obtained is more susceptible to the problems of thickness and permeability discussed above since it comprises more than one separate seam.

There is also the problem of matching the size of the base, even with endless laminated fabrics. At any time two separate bases are woven, especially of different construction, the probabilities being that the lengths of the base at the point of lamination during sewing are sufficiently different to require that one of the bases be further processed. This costs money and takes time. Often, one of the bases must be discarded and a new one manufactured. Accordingly, the provision of a laminated pressing fabric, which can be sewn onto the machine easily, whose individual sheets are dimensionally coupled well and in appearance and quality, and whose seam can easily be closed on a paper machine, would fill a large need in the papermaking industry. The present invention, which will now be described in the following passages, is intended to fill this industry need.

Brief Description of the Invention The present invention is a laminated fabric, integrally woven, which can be sewn on the machine, for making paper and a method for manufacturing the fabric for making paper.

The papermaking fabric of the invention includes a first plurality of warp yarns and a second plurality of warp yarns interwoven with a continuous weft yarn by an endless weaving technique. That is, the continuous weft yarn interweaves alternately with the first plurality of warp yarns to produce a first woven pleat, and with the second plurality of warp yarns to produce a second woven pleat. The alternate continuous weft yarn interwoven with the first plurality of warp yarns and with the second plurality of warp yarns at each of the two ends across the width of the fabric. When alternated in this way, the continuous weft yarn forms a plurality of seaming rings to be used in the joining of the fabric in an endless form. It should be appreciated that the continuous weft yarn is the yarn in the machine direction (MD) of the first and second woven folds when the papermaking fabric is in its position of use on the paper machine. The papermaking fabric is accordingly a laminated structure having two woven folds joined together by the plurality of seam rings along the two ends in width. The papermaking fabric can be sewn with a block of fibrous material of cut fiber material, as is commonly done in the industry. The seam directs the fibers towards and through the two woven folds to join them together better. The sewing rings, as noted earlier, are used to join the ends across the width of the fabric together to place the fabric in the shape of an endless ring. Alternatively, a single-filament seam spiral can be attached to the seam rings at each of the two ends across the width of the papermaking fabric either before or after sewing the fabric with a block of fibrous material of staple fibers. The spirals of the single-filament seam are connected to the seam rings by at least one connecting thread. The spiral clusters at the two ends of the fabric can then intertwine and join together on the paper machine to form a seam which is commonly referred to as a spiral seam. During weaving of the papermaking fabric, a plurality of solvent-removable ligature yarns are interwoven with at least one of the continuous weft yarn and the first and second plurality of warp yarns for ligating the two woven folds together. That is, the fabric may include a warp ligature, a weft ligature, or ligatures in both directions of the fabric. The ligature threads are made of a material soluble in a particular solvent that does not affect the functional knitted core yarns, that is, the first and second plurality of warp yarns and the continuous weft yarn. Once the fabric is woven, and before or after it is woven with fibrous material block of cut fiber material, the ligating yarns are removed through the solution with the particular solvent to give a laminated structure. The present invention is also a method for manufacturing a fabric for manufacturing paper that can be sewn onto the machine comprising the steps of providing the yarns mentioned above, and for weaving a two-pleat fabric with a ligature thereon by means of a technique endless seam, where the seam lines are formed at the two ends across the width of it. In the endless weaving process, the continuous weft number alternates between the first and second plurality of warp yarns at the two ends across the width of the fabric, providing at each alternation one of a plurality of seam rings to join the fabric in an endless form. At the same time, the plurality of solvent-removable ligature yarns are interwoven with at least one of the endless weft yarn and the first and second plurality of warp yarns for ligating the first and second folds together. Subsequently, the solvent-removable warp and / or weft ligature yarns are removed by dissolution with the particular solvent to give a laminated papermaking fabric which can be sewn onto the machine, comprising first and second folds joined together and the ends across the width of the fabric by the sewing rings, which are formed by themselves by the continuous weft yarn used to weave the folds. Although it is intended that the present laminated papermaking fabric, which can be sewn onto the machine, be used primarily as a press fabric, it can also find use as a forming or drying fabric, or as a base for a Process Band. in the Paper Industry, coated with polymeric resin, such as a given clamping point press band (LNP), a sheet transfer belt, or a calender band. The present invention will now be described in greater detail with frequent reference to the figures identified as follows.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic perspective view of a press fabric which can be sewn onto the machine (OMS®) / Figure 2 is a schematic perspective view of the two ends of the press fabric of OMS® before being joined to others; Figure 3 is a cross-sectional view taken as indicated by line 3-3 in Figure 2; Figure 4 is a cross-sectional view, corresponding to that of Figure 3, after removal of a removable thread with solvent; Figure 5 is a cross-sectional view taken as indicated by line 5-5 in Figure 3; Figure 6 is a cross-sectional view taken as indicated by line 6-6 in Figure 4; Figure 7 is a cross-sectional view of the seam of the OMS * press fabric of the present invention taken as indicated by line 7-7 in Figure 1; Figure 8 is a cross-sectional view of the seam of the OMS® press fabric of the present invention taken in the same manner as indicated by line 7-7 in Figure 1 after removal of the yarns from Removable ligatures with solvent / and Figure 9 is a cross-sectional view of an alternative embodiment of the seam taken in the same manner as indicated by line 7-7 of Figure 1.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Turning now specifically to the figures, FIGURE 1 is a schematic perspective view of a papermaking fabric which can be sewn onto the machine (OMS®) 10. The fabric 10 takes the form of a endless ring once its two ends 12, 14 have been joined together in the seam 16. Figure 2 is a schematic perspective view of the two ends 12, 14 of the fabric OMS '"' 10 before its joining Between each other, a plurality of sewing means 18 are found across the edges of each of the two ends 12, 14. To join the two ends 12, 14 together, they are put together, making the Seam rings at each end are alternated and interwoven or interlaced together The interlocking seam rings 18 define a passage through which a bolt or pin may be directed, a strand or member similar to a thread, to secure the ends 12, 14 with each other to form the seam. The sewing rings 18 are formed by the yarns in the machine direction (MD) 10, the direction of the machine is the direction of movement of the fabric 10 on the paper machine. In the fabric of the fabrics 10 of the present invention, the machine direction yarns (MD) forming seam rings 18 are the continuous weft yarns on the loom. These weft threads are woven endlessly back and forth through the loom in a process known in the industry as modified endless fabric. At suitable intervals, they are woven around an edge cord, joining the seaming ring 18 which is finally used to sew the fabric during the installation of a paper machine. Several schemes, described and claimed in the U.S. Patent No. 3,815,645 to Codorniu, the teachings of which are incorporated herein by reference, for weaving OMS® fabrics by the modified endless seam are available and may be used in the practice of the present invention. In a scheme, an edge cord is deposited on one of the two edges of the loom. The continuous weft yarns woven around the edge cord alternately form sewing rings 18 for the upper and lower cloths on a loom. The other edge of the loom, the weft threads take a continuous path from the upper cloth to the lower cloth, or vice versa, as in the traditional endless fabric. As a consequence, the upper and lower cloths are connected by a series of continuous weft threads on this last edge of the loom, connected at the same time by two sets of seam rings 18., one for the upper cloth and the other for the lower cloth, joined by the edge cord on the first edge of the loom. Finally, the upper and lower cloths together form an endless cloth ring which can be opened by removing the edge cord. Figure 3 is a cross-sectional view taken as indicated by line 3-3 in Figure 2. The cross-section, in the machine direction (CD) and, consequently, the MD 20, 20 'threads. , 22 is ventilation in cross section while the CD 26, 28 threads are ventilated from the side. It should be understood that in this and other figures the separation scale between MD yarns 20, 20 ', 22 and CD yarns 26, 28 has been greatly exaggerated for purposes of clarity. It should be recognized, with the yarns MD 20, 20 ', 22 being weft yarns, that the fabric 10 shown in Figure 3 is a two-pleat fabric with a weft ligature. The yarn CD 26, which is a warp yarn on the loom used to weave the fabric 10, is interwoven with the MD yarns 20, 22 to form one of the two folds. The CD yarn 28, on the other hand, is interwoven with the MD yarns 20, 22 to form the other of the two folds. This can also be described as a 2H layer fabric. Although a specific fabric pattern is shown in Figure 3, it should be understood that it is shown for purposes of illustration only, and that a two-pleat fabric, any woven pattern having a warp tie, a weft tie, may be used. , or both types of ligature for weaving the fabric 10 of the present invention. It should also be understood that the MD yarns 20, 20 ', 22 and the CD yarns 26, 28 can be of any yarn classifications conventionally used by those in the bath industry for paper machines for weaving press fabrics. That is, any MD 20, 20 ', 22 threads and CD threads 26, 28 can be single filament, single bent filament, multiple filaments, multiple bent filaments, spin, single woven filament, of multiple filaments woven to point, of a single interlaced filament, of multiple intertwined filaments, of a single filament coated with polyurethane, of a single filament or multiple double strands, of two components or any other type of thread.

The yarn MD 22, or, in general, the yarn or yarns function as the ligature that holds the two folds together, can, however, be made of a soluble material, such as SOLVRON® (polyvinyl alcohol) or calcium alginate, which are soluble in water. Alternatively, certain uncured polymeric resin materials are soluble in hot water and could be used for MD yarn 22. Uncured acrylics are an example of such materials. On the other hand, the MD yarns 20, 20 ', 22 and the CD yarns 26, 28 can be made of polyamide, polyester, polyaramides, polyetheretherketone (PEEK) and polyurethanes, or any other polymeric resin material from which they can be extruded or formed yarns textiles Figure 4 is a cross-sectional view, corresponding to that provided in Figure 3, of the fabric 10 after removal, by dissolution using the appropriate solvent, of the MD 22 yarn. After the removal of the MD yarn 22 in this manner, the two folds 30, 32 are separated from each other. The fold 30 is a single layer fabric formed by the interweaving of the MD 20 threads with the CD threads 26, while the fold 32 is a single layer fabric formed by the interweaving of the threads MD 20 'with the threads CD 28. Figure 5 is a cross-sectional view of the fabric 10 taken according to what is indicated by the line 5-5 in Figure 3. Shown in Figure 5 is the seaming ring 18 formed at the end 12 thereof, wherein the yarn MD 20 turns back, wrapping around an edge cord (not shown) during the weaving process, and becomes the yarn MD 20 '. It can now be understood more clearly that the MD yarns 20, 20 'are one and the same continuous weft yarn, which is woven back and forth through the loom and which forms a seam ring 18 as it passes around the edge cord. on the edge that forms the ring of the loom.

On the other hand, the MD 22 yarn does not need to be endless woven in the same manner as the yarns 20, 20 ', but can be woven in a different pattern. In Figure 5, the yarn MD 22 is shown as having an end adjacent to the seaming ring 18. There is no need to form such a seaming ring 18 with the yarn MD 22, or weave it in a modified endless form, since the MD 22 yarn, which is of a soluble material, has to be removed in any way by an appropriate solvent. In general, of course, that solvent is one that dissolves the MD yarn 22 without dissolving c any of the MD yarns 20, 20 ', or the CD yarns 26, 28. Figure 6 is a cross-sectional view of the fabric 10. taken as indicated by line 6-6 in Figure 4, and corresponding to the one provided in Figure 6 after the removal, by dissolution using the appropriate solvent, of MD 22 yarn. After removal of the MD yarn in this manner, the two folds 30, 32 are joined together only in the seaming rings 18. As a consequence, the laminated fabric 10, comprising two folds of a single layer 30, 32, each being woven from MD and CD threads, and endlessly joined by seam rings 18, as a result. Figure 7 is a cross-sectional view of the seam 16 taken according to that indicated by line 7-7 in Figure 1 before removal of the yarn MD 22. The seaming rings 18 at the ends 12, 14 are interleaved with each other, as explained above, and a bolt, or pin is punched, 34 through the passage defined by the interlocking sewing rings 18 to join the ends 12, 14 together. A block of the fibrous material 36 of cut fiber material is sewn through the papermaking fabric. The staple fiber fabrics can include polyamide, polyester, polyimide, polypropylene, polyolefin, polyethylene terephthalate (PET), polyetheretherketone (PEEK), polytetrafluoroethylene (PTFE), polyaramid, paraaramide or metaaramide fibers. Alternatively, or in addition to the fibrous material block 36 of staple fibers, the papermaking fabric can be impregnated with a polymeric resin material or a fiber reinforced polymeric resin material. Figure 8 is a cross-sectional view of the seam 16 taken in the same manner as indicated by line 7-7 in Figure 1 after removal of the removable MD yarn 22. The sewing rings 18 in the ends 12, 14 are again entangled with each other and a bolt, or pin, 34, is directed through a passage defined by the interlocked seam rings 18 to join the ends 12, 14 together. A block of fibrous material 36 of cut fiber material is sewn through the pleats 30, 32 to join them together. The block of fibrous material 36 may include fibers cut from any of the materials noted above. Alternatively, or in addition to the fibrous material block 36 of staple fibers, the folds 30, 32 can be joined together by impregnation with a poly-resin material or a fiber-reinforced polymer resin material. The removable MD yarn 22 can be removed at any time after weaving, during the manufacturing process after installation on the paper machine. Figure 9 is a cross-sectional view of a seam of alternative embodiment 39 taken in the same manner as indicated by line 7-7 in Figure 1. At seam 38, seam rings 18 are not interlaced between yes. In addition, an extruded single filament stitching spiral 40 is attached to each end 12, 14 by interlocking the single filament stitching spirals 40 with the stitching rings 18 at the ends 12, 14 and directing one or more threads connection 42 through the passages defined by the intersection of the single-filament seam spirals 40 and the seam rings 18. The seam 38 is then formed by interlocking the seam spiral clusters 40, and directing a bolt, or bolt. punzado, 34 through the passage defined by the spiral clusters iritersectados. A block of fibrous material 36 of staple fibers of any of the polymeric materials noted above is sewn through the pleats 30, 32 to join them together either before or after the single filament seam 40 spirals are joined to the ends 12, 14. As noted above, the present papermaking fabric can be used as the basis for a polymer-coated Process Paper Band (PIPB), such as a one-point press band. soft contact (LNP), a sheet transfer band, a calender band. In such a case, at least one side of the papermaking fabric is coated with a polymeric resin material, such as polyurethane, after the soluble ligature yarn is removed. Prior to the application of the coating, the papermaking fabric may be sewn with a block of fibrous material of cut fiber material. The present invention offers several advantages not provided by the fabrics of the prior art. First, and most importantly, the OMS® fabric is produced in an operation on the loom with both sheets, or folds, being woven in an integral manner. In the preferred embodiment, the fabric itself comprises two folds of a single layer, which by themselves could be difficult to sew, but which are sewn together because sewing rings are formed by themselves by means of a thread that It serves as the MD yarn of both folds. In addition, the two folds fit perfectly in size, obviating the endemic adjustment problems of the laminated pressing fabrics of the prior art. The seam formed in the manner of the present invention has characteristics much more similar to those of the rest of the body of the laminated fabric than one resulting from a seam made separately for each single layer fold, and is much less likely to mark the paper that is being manufactured. Finally, because the sheets are woven integrally, the count of CD yarns in each fold can be less than would be required if they were woven separately. This ensures that each fold is lighter and more open, and that the laminated press fabric thus obtained is not as heavy, dense or rigid as those of the prior art. Clearly, modifications to the foregoing would be obvious to those skilled in the art, but would not lead to the invention if they were modified beyond the scope of the appended claims.

Claims (32)

CHAPTER CLAIMEDICATORÍO Having described the invention, it is considered as a novelty and, therefore, the content is claimed in the following:

1. A laminated fabric, woven in an integral manner, for making paper, which can be sewn on the machine, the fabric has two ends and a plurality of seam rings at each of the two ends to be used in the joining of the fabric in an endless form with a bolt seam, the fabric is characterized in that it comprises: a first plurality of warp yarns; a second plurality of warp yarns; and a continuous weft yarn, wherein the continuous weft yarn interweaves alternately with the first plurality of warp yarns to produce a first woven pleat, and with the second plurality of warp yarns to produce a second woven weave, the yarn of continuous web alternates between the interwoven with the first plurality of warp yarns and with the second plurality of warp yarns at each of the two ends of the fabric, when alternated in this way, it forms one of the plurality of warp rings. seam for joining the fabric in endless form, therefore the fabric is a laminated structure having two woven folds joined together by the plurality of seam rings along the two ends.

The papermaking fabric according to claim 1, characterized in that it further comprises a block of fibrous material stitched in and through the laminated structure and further joining the two woven folds together.

The papermaking fabric according to claim 2, characterized in that the block of fibrous material of cut fiber material includes staple fibers of a polymeric resin selected from the group consisting of polyamide, polyester, polyimide, polypropylene, polyolefin, terephthalate polyethylene (PET), polyetheretherketone (PEEK), polytetrafluoroethylene (PTFE), polyaramide, paraaramide or metaaramide.

4. The papermaking fabric according to claim 1, characterized in that it further comprises a polymeric resin material impregnating the laminated structure and further joining the two folds of fabric together.

5. The papermaking fabric according to claim 4, characterized in that the polymeric resin material is reinforced with fiber.

6. The papermaking fabric according to claim 1, characterized in that it comprises a first and second seam spiral of a single filament, the first seam spiral is attached to the seam rings at one of the ends of the fabric by at least one a connecting thread and the second seaming spiral is attached to the seaming rings at another end of the fabric by at least one connecting thread, the first and second seaming coils each having a plurality of threads, those of The first sewing spiral are intertwined with those of the second sewing spiral.

The papermaking fabric according to claim 1, characterized in that the first plurality of warp yarns, the second plurality of warp yarns and the continuous weft yarn are yarns of the types selected from the group consisting of a single yarn. filament, of a single bent filament, of multiple filaments, of multiple filaments bent, centrifuged and a single filament woven by point, of multiple filaments woven by point, of a single interlaced filament, of multiple strands interlaced, of a single filament coated with polyurethane, single-strand or double strands folded and two-component strands.

The papermaking fabric according to claim 1, characterized in that the first plurality of warp yarns, the second plurality of warp yarns, and the continuous weft yarn are yarns of polymeric resin materials selected from the group consisting of polyamide, polyester, polyaramides, polyetheretherketone (PEEK) and polyurethanes.

The papermaking fabric according to claim 1, characterized in that it further comprises a coating of a polymeric resin material on at least one side thereof, so that the papermaking fabric can be a process strip of the paper industry, coated with polymer.

The papermaking fabric according to claim 2, characterized in that it comprises a coating of a polymeric resin material on at least one side thereof, so that the papermaking fabric can be a process strip of the Paper industry, coated with polymer.

11. An intermediate felling product for making paper which can be sewn onto the machine, the intermediate fabric product has two ends and a plurality of seam rings at each of the two ends to be used in the joining of the fabric in an endless shape, the intermediate fabric product is characterized in that it comprises: a first plurality of warp yarns; a second plurality of warp yarns; a continuous weft thread; and a plurality of solvent-removable ligature yarns, the binding yarns are soluble in a particular solvent that does not affect the first and second plurality of warp yarns and the endless weft yarn, wherein the continuous weft yarn is interweave alternately with the first plurality of warp yarns to produce a first woven pleat, and with the second plurality of warp yarns to produce a second woven pleat, the continuous weft yarn alternates between the woven with the first plurality of warp yarns and with the second plurality of warp yarns at each of the two ends of the intermediate product of the fabric, when alternating in this way, it forms one of the plurality of seam rings to join the intermediate product of the fabric in a non-uniform manner. end, and wherein the plurality of solvent-removable ligature yarns is interwoven with at least one of the continuous weft yarn and the first and second plurality of weft yarns. rim to join the first and second folds together.

12. The fabric product for papermaking according to claim 11, characterized in that the plurality of solvent-removable ligature yarns is a plurality of warp-binding yarns.

13. The papermaking fabric product according to claim 11, characterized in that the plurality of solvent removable ligature yarns is a plurality of weft binding yarns.

The papermaking fabric product according to claim 11, characterized in that the plurality of solvent-removable ligature yarns is a plurality of warp-binding yarns and a plurality of weft-binding yarns.

The fabric product for papermaking according to claim 11, characterized in that the plurality of solvent-removable ligature yarns is of a material selected from the group consisting of polyvinyl alcohol, calcium alginate, and uncured acrylic, and wherein the particular solvent is water.

16. The fabric product for papermaking according to claim 11, characterized in that it comprises a block of fibrous material of cut fiber material sewn into and through the first and second woven folds.

The papermaking fabric product according to claim 16, characterized in that the fibrous material block of cut fiber material includes staple fibers of a polymeric resin selected from the group consisting of polyamide, polyester, polyimide, polypropylene, polyolefin , polyethylene terephthalate (PET), polyetheretherketone (PEEK), polytetrafluoroethylene (PTFE), polyara ida, paraara ida or metaaramide.

18. The paper fabric product according to claim 11, characterized in that it further comprises a polymeric resin material that impregnates the first and second folds woven.

19. The product of papermaking fabric according to claim 18, characterized in that the polymeric resin material is reinforced with fiber.

The papermaking fabric product according to claim 11, characterized in that it further comprises a first and second single filament stitch spiral, the first stitch spiral is attached to the stitch rings at one end of the stitch. the fabric by at least one connecting thread and the second seaming spiral is joined to the sewing rings at another end of the fabric by at least one connecting thread, the first and second seaming spirals each having a plurality of threads, those of the first sewing spiral are intertwined with those of the second sewing spiral.

21. The fabric product for papermaking according to claim 11, characterized in that the first plurality of warp yarns, the second plurality of warp yarns and the continuous weft yarn are yarns of the types selected from the group consisting of a single filament, of a single bent filament, of multiple filaments, of multiple filaments bent, centrifuged and a single filament woven on the spot, of multiple filaments woven on the spot, of a single interlaced filament, of multiple interlaced filaments, of a single filament coated with polyurethane , of a single strand or multiple strands folded and two-component strands.

22. The fabric product for papermaking according to claim 11, characterized in that the first plurality of warp yarns, the second plurality of warp yarns, and the continuous weft yarn are yarns of polymeric resin materials selected from the group. consisting of polyamide, polyester, polyaramides, polyetheretherketone (PEEK) and polyurethanes.

The papermaking fabric product according to claim 11, characterized in that it further comprises a coating of a polymeric resin material on at least one side thereof, so that the papermaking fabric can be a web of paper. process of the paper industry, coated with polymer.

24. The papermaking fabric product according to claim 11, characterized in that it comprises a coating of a polymeric resin material on at least one side thereof, so that the papermaking fabric can be a process strip. of the paper industry, coated with polymer.

25. A method for manufacturing a laminated fabric, integrally, for making paper, which can be sewn on the machine, characterized in that it comprises the steps of: providing a first plurality of warp yarns, a second plurality of warp yarns , a continuous weft yarn, and a plurality of solvent removable ligature yarns, the ligation yarns are soluble in a particular solvent that does not affect the first and second plurality of warp yarns and the continuous weft yarn; weaving a two-pleat fabric from the yarns by an endless weaving technique, wherein the two-pleat fabric has two ends and where two-end seam rings are formed by weaving the continuous weft yarn around a cord at the edge, the alternate weft yarn interwoven with the first plurality of warp yarns and with the second plurality of warp yarns following each the alternate passage around the edge bead to provide a first fold and a second fold, respectively, interweaving the plurality of solvent-removable ligature yarns with at least one of the continuous weft yarn and the first and second plurality of warp yarns to provide the first and second folds together.

26. The method according to claim 25, characterized in that the plurality of solvent-removable ligature yarns is a plurality of warp ligature yarns, and wherein the plurality of warp ligature yarns are woven with the weft yarn. continuous.

27. The method of compliance with the claim 25, characterized in that the plurality of solvent-removable ligature yarns is a plurality of weft binder yarns, and wherein the plurality of binder yarns are interwoven with the first and second plurality of warp yarns.

28. The method according to claim 25, characterized in that the plurality of solvent-removable ligature yarns is both a plurality of warp ligature yarns and a plurality of weft binding yarns, and wherein the plurality of yarns The warp tie is interwoven with the continuous weft yarn and the plurality of weft tie yarns are interwoven with the first and second plurality of warp yarns.

The method according to claim 25, characterized in that it further cises the step of: removing the plurality of solvent-removable ligature yarns through the solution with the particular solvent, whereby a laminated papermaking fabric is obtained which can be sewn onto the machine cising the first and second pleats joined together in the seam rings.

30. The method according to claim 25, characterized in that the plurality of solvent-removable ligature yarns is of a material selected from the group consisting of polyvinyl alcohol, calcium alginate, and uncured acrylic, and wherein the particular solvent is water.

31. The method according to claim 25, characterized in that it further cises the step of: sewing a block of fibrous material of the fiber material cut in and through the first fold and the second fold.

32. The method according to claim 25, characterized in that it further cises the steps of: providing one. first and a second plurality of single-filament seams; remove the cord from the edge to separate the two ends of the fabric from two folds together; connect the first single-filament seam spiral to the seam rings on one of the two ends of the two-pleat fabric by interlacing the first seam spiral of a single strand with the seam rings and choosing at least one connecting thread through the passage defined by these; and connecting the second seam spiral of a single strand to the seam rings on the other of the two ends of the two-pleat fabric by interlacing the second seam spiral of a single strand with the seam rings and directing at least one thread connection through a passage defined by these.