JP2003522856A - Industrial cloth to be seamed - Google Patents

Abstract

An industrial fabric (20) is woven from machine-direction (MD) (24) and cross-machine-direction (CD) yarns (22), wherein the MD yarns (24) are multicomponent yarns having a plurality of individual strands and at least one thermofusible strand of a thermoplastic material. The at least one thermofusible strand of a thermoplastic material has a melting point lower than that of the individual strands of the multicomponent yarn. Upon application of a heat treatment, the multicomponent yarns are stiffened and the individual strands thereof are held together by the thermoplastic material of the at least one thermofusible strand.

Description

Detailed Description of the Invention

TECHNICAL FIELD The present invention relates to papermaking and technology related thereto. More specifically, the present invention is an industrial fabric of a machine-seamable type, such as a machine-seamable press fabric in the press section of a paper machine.

In the papermaking process, a cellulosic fibrous web is used to precipitate a fibrous slurry, ie, an aqueous dispersion of cellulose fibers, on a running fabric in the forming section of a paper machine. It is formed by A large amount of water is drained from the slurry through the forming fabric, leaving the cellulosic fibrous web on the surface of the forming fabric.

A newly formed cellulosic fibrous web proceeds from the forming section to a press section that includes a series of press nips. The cellulosic fibrous web passes through the press nip, either supported by one press fabric, or often between two press fabrics.
At the press nip, the cellulosic fibrous web is subjected to a compressive force that squeezes water therefrom and bonds the cellulosic fibers in the web to one another to convert the cellulosic fibrous web into a sheet of paper. Water is taken up by the press fabric and ideally does not return to the paper sheet.

The sheet of paper finally goes to a dryer section which comprises at least a series of rotatable dryer drums or cylinders which are internally heated by steam. The newly formed paper sheet is then guided into a serpentine path around each of the rows of drums by a dryer cloth that holds the paper sheet against the surface of the drum. The heated drum reduces the water content of the paper sheet to the desired level by evaporation.

It should be appreciated that the forming, pressing and dryer fabrics all function on the paper machine in the form of endless loops and functions similar to a conveyor. Further, it should be appreciated that papermaking is a continuous process that proceeds at a reasonable speed. That is, the fibrous slurry is continuously deposited on the forming fabric in the forming station, while the newly produced paper sheet is continuously wound onto rolls after it exits the dryer section.

For the time being, it should be recalled that by reference only to press fabrics, press fabrics were once supplied only in endless form. This is because the newly formed cellulosic fibrous web is extremely sensitive to marking due to any non-uniformity of the press fabric in the press nip. Endless, seamless fabrics, such as those produced by a process known as endless weaving, have their warp (machine)
It has a uniform structure in both the horizontal and transverse directions (perpendicular to the machine). Seams, such as those used to endlessly close a press fabric when installed on a paper machine, exhibit discontinuities in the uniform structure of the press fabric. The use of seams thus greatly increases the likelihood that the cellulosic fibrous web will be marked in the press nip.

For this reason, in order to avoid periodic marking of the paper product made by the seam area under load, ie under compression in the press nip, any workable seam area of the press seamable. In addition, it must behave like the rest of the press fabric and must have the same permeability to water and air as the rest of the press fabric.

Despite the considerable technical obstacles presented by these requirements, it is relatively easy and safe for such fabrics to be placed in the press section, and the presses that are seamable on the machine for reasons of safety. The high demand for the development of cloth remained. Ultimately, these obstacles have been overcome by the development of a press fabric having a seam formed by the provision of seaming loops on the transverse edges of the fabric. The seaming loop itself is formed by the machine direction (MD) threads of the fabric. The seam brings together the ends of the press fabric, entangles the seaming loops at both ends of the fabric, and so-called pins through the passages defined by the entangled seaming loops to secure the ends of the fabric together. Alternatively, it is closed by guiding the shaft rod. It goes without saying that installing a seamable press cloth on the machine is much easier and far less time consuming than installing an endless press cloth on a paper machine.

One method of making press fabrics that can be joined on a paper machine with such seams is to plain weave the fabric. In this case, the warp threads are the machine direction (MD) threads of the press fabric. To form a seam loop, the warp yarns are folded back at the edges of the fabric and back-woven a distance in the fabric body in a direction parallel to the warp yarns. Another much more preferred technology is
A variation on the endless weave that is commonly used to produce endless loops of cloth. In a modified endless weave, the weft threads pass back and forth continuously around the loom in each passage forming a loop on one of the edges of the fabric being woven by passing around a loop-forming pin. It is woven. Since the weft yarns, which in the end are MD yarns in a press fabric, are continuous, the spliced loops obtained by this method are stronger than anything that can be made by weaving warp yarns into the ends of a plain woven fabric. .

PROBLEM TO BE SOLVED BY THE INVENTION Initially, a single filament yarn was used both in the machine direction of a press fabric that was seamable on a machine and in the direction orthogonal to the machine. The associated stiffness of the monofilament ensures that it will have the necessary good splicing loop forming properties. However, experience has shown that single monofilament yarns are difficult to weave and have insufficient elasticity in the machine direction for many modern presses. Lack of tension and breakage of seams often occurred.

Another difficulty is that the base fabric woven from single monofilaments is very rough and stiff,
Presented by an incompressible structure. In some papermaking applications, this incompressibility is not a problem, or even ideal. However, softer, more compressible base fabrics are needed at locations with poor auxiliary fabric dewatering capacity or to make mark-sensitive grade paper.

A more compressible base fabric is obtained by weaving multifilament or twisted monofilament yarns instead of single monofilament yarns. However, these types of yarns do not have the necessary stiffness to maintain good loop formation and the integrity of the seam area during the loop entanglement required when the seam is to be closed. Moreover, because these types of yarns are twisted, the loops formed from them tend to rotate about an axis that lies in the plane formed by the loops. When this rotation, known as the quadratic spiral effect, occurs, it rotates the loop from the ideal orientation required for entanglement. Such deviations make it possible, even if not impossible, to accurately entangle the loops at each end of the press fabric during closing and to guide the axle through the passage defined by the similarly entangled loops. Even making it difficult.

Various attempts have been made in the prior art to overcome these difficulties by making non-monofilament looping MD yarns that act like monofilaments. US Patent No. 500561
In No. 0, the MD yarns in the machine-seamable paper machine fabric have a composite structure that includes knitted monofilament yarns. The knitted yarns form seam loops that resist deformation, because they form seam loops that are insensitive to "secondary spiral effect" rotation due to the ideal planar geometry of the seam, and This is because they are in equilibrium.

In US Pat. No. 5,204,150, the MD yarns in a machine machine seamable fabric are made from a resin partially melted by heat treatment of the fabric while imparting monofilament-like properties to the MD yarns. Extruded twisted / twisted yarn. Melting by partial melting of the individual ends prevents rotation of the loop from the ideal seam geometry, even if unbalanced due to twisting or twisting.

In US Pat. No. 5,391,419, MD of a paper machine cloth that is seamable on the machine.
A thread is a twisted / twisted thread that has a coating that gives the thread a monofilament-like structure. The coating may be permanent, semi-permanent or soluble. The coating prevents rotation of the loop even if the threads are not balanced.

In US Pat. No. 5,514,438, MD of a paper machine cloth seamable on the machine
The thread has a monofilament core surrounded by a multifilament sheath into a cable. A multifilament sheath bundles the monofilaments into a cable together and occludes the passage defined by the entangled loop formed by the MD yarns during seaming of any monofilament in the core. Prevent.

Finally, in US Pat. No. 5,875,822, the MD yarns of a machine-seamable paper machine fabric are twisted / twisted yarns and along the lateral edges at both ends of the fabric. To form a seamed loop. A monofilament seaming helix is attached to the seaming loop at each end. Seaming spirals are used to join fabrics in an endless fashion, thereby providing fabrics having twisted / twisted MD yarns with monofilament connecting means.

Means for Solving the Invention The present invention is a machine having twisted / twisted MD yarns with seaming loops that maintain their integrity and correct orientation during seaming. The above represents a different approach to providing a seamable industrial fabric.

Accordingly, it is an object of the present invention to provide a mechanically seamable industrial seam having multi-component MD yarns with seaming loops that maintain the correct orientation for seaming and the required integrity. To provide the cloth.

The purpose is seamable on the machine by using as the machine direction (MD) yarn a multicomponent yarn consisting of a plurality of individual yarns and at least one thermofusible yarn of a thermoplastic material. The thermoplastic material of the at least one heat-fusible yarn, which is compatible with various industrial fabrics, has a lower melting point than that of the individual yarns in the multicomponent yarn.
As a result, when any given length of multi-component yarn is heat treated at a temperature above the melting point of the heat soluble yarn but below that of the individual yarns, the thermoplastic material will melt and the space between the individual yarns will increase. After flowing into the interstices and after the heat treatment, it resolidifies to stiffen the multicomponent yarn and hold the individual yarns together along their given length. This ensures that the seaming loop formed by the multi-component yarn will maintain the correct orientation for the seaming and the required integrity.

Furthermore, the inclusion of one or more heat-soluble yarns in the multi-component yarn allows the stiffness of the yarn to be controlled based on the number and / or size of the heat-soluble yarns contained. To In turn, this allows the compressibility and resilience of the fabric to be controlled to a greater extent than is possible with fabrics made with yarns that do not have heat-soluble yarns.

The multicomponent yarn may be twisted monofilament, twisted polyfilament, polyfilament or twisted / twisted yarn or a combination thereof. Twisted / twisted yarns are twisted together to the desired degree, and often also have many ends or fibers combined or twisted with other fibers of the same or different types. Means any type of yarn used in the production of paper machine fabrics. During the twisting operation, the components of the yarn are combined together by twisting them in the opposite direction to that of the individual components. Thus twisted / twisted yarns may be considered to be multi-component yarns. The multi-component yarn may alternatively be a twisted or knitted yarn. In any case, the multicomponent yarn comprises at least one heat soluble yarn.

The individual yarns included in the multicomponent yarn are typically of circular cross section,
It should be understood that it may be of any other cross-sectional shape such as rectangular, oval or multilobal. Multi-component yarns made by twisting / twisting, twisting or knitting the components may have non-circular shaped cross-sections.

Industrial fabrics seamable on the machine may be woven by a modified endless weaving technique from a system of MD yarns and a system of machine direction orthogonal (CD) yarns, where the MD yarns are , The above-mentioned multi-component yarn. Alternatively, the industrial fabric may be plain weave, where the MD yarns, the warp yarns during the weaving process, are again multi-component yarns. In each case, the industrial fabric has a rectangular shape with a length, a width, two longitudinal edges and two lateral edges.

In the modified endless technique, MD yarns (multicomponent yarns) stretch back and forth continuously between the two lateral edges at the length of the industrial fabric, and one of the two lateral edges. Forming a first plurality of seaming loops along one and a second plurality of seaming loops along the other one of the two lateral edges. In the application of the heat treatment described above, it can be done at any time during the manufacturing process, even in the yarn forming stage, and the multicomponent yarn and the seaming loops formed from it are stiffened and their multiple individual loops are stiffened. The yarns are held together by the thermoplastic material of at least one heat soluble yarn in the multicomponent yarn.

On the other hand, if the industrial fabric is a plain weave, the warp threads extending from its two lateral edges are
It is folded back to form a seam loop and woven back a distance within the fabric body.

The industrial fabric is entangled to close the loop seam by interlocking the first plurality of seaming loops with the second plurality of seaming loops and securing the two lateral edges of the fabric together. They are connected endlessly by guiding the shaft through a passage defined by a spliced loop.

It should be appreciated that multi-component yarns may also be used to increase the CD stability of the fabric in the cross-machine direction (CD). In the endless woven structure, the stiffness of the CD yarn is directly related to the number of MD yarns and CD yarns contained in the cloth regardless of the presence or absence of a seam. The use of low stiffness yarns in weaves allows a wide range and particularly high end counts. If the multi-component yarn is used in a direction orthogonal to the machine, the number of MD and CD yarns in the fabric will be increased, and the multi-component yarn will be properly stiffened by heat treatment after weaving.

The present multi-component yarn can also be designed to have the folds needed to form such seams so that it can be machine direction (plain) in plain weave fabrics that are connected in an endless fashion by woven seams. It may also be used as a MD) thread.

DETAILED DESCRIPTION OF THE INVENTION The present invention will now be described more fully in detail with reference to the figures now related to the following.

Detailed Description of the Preferred Embodiments Turning now specifically to the drawings, FIG. 1 shows an industrial fabric 10 that is seamable on a machine.
It is a schematic perspective view of FIG. The fabric 10 takes the form of an endless loop once its two ends 12, 14 are joined together at a seam 16.

FIG. 2 is a schematic perspective view of the two ends 12, 14 of the mechanically seamable industrial fabric 10 before they are attached to each other. There are a plurality of seaming loops 18 across the edges of each of the two ends 12,14. In order to glue the two ends 12, 14 together, they are brought in alternating and intermeshing or intertwining seaming loops 18 at each end. The entangled seaming loop 18 defines a passageway through which a pin, or shaft, thread-like cord or member is guided to hold the ends 12, 14 together.

FIG. 3 is a cross-sectional view taken in the warp direction of an industrial fabric 20 in which the present invention is implemented.
Although the fabric 20 is shown as being woven in a double weave, this weave is shown as an example only, and the present invention is not limited to single, two, three or higher layers. It is to be understood that other woven fabrics 20 may be practiced, such as woven fabrics, or other woven fabrics that are laminated to include several fabric layers. The fabric 20 may be a base fabric in a press fabric, and thus may be sewn with one or more layers of staple fiber batting on one or both sides, or may be coated in some way. Alternatively, the fabric 20 may be used in one of the other sections of the paper machine, namely the forming or drying section, or as a base fabric for a polymeric resin coated paper industry process belt (PIPB). Further, the fabric 20 may be used as a corrugated belt or as its base fabric; as a pulp forming fabric such as a double nip concentrator belt; or as other industrial process belts.

The fabric 20 is woven using a modified endless weaving technique. In this case, the warp yarn 22 finally becomes the machine direction (CD) yarn, and the weft yarn 24 finally becomes the machine direction (M) yarn.
D) A yarn, the current relationship is made to the orientation of the yarn relative to the machine on which the cloth 20 is installed.

The warp yarn 22, the CD yarn in the machine seamable fabric 20, may be any type of yarn used to weave the basis of a paper machine fabric or PIPB, other fabrics and belts described above. Good. In other words, as mentioned above, monofilament yarns, which are monofilament yarns used alone or in multicomponent yarns, may be used as warp yarns 22.

On the other hand, the weft yarn 24, the MD yarn in the machine-seamable fabric 20, is a multi-component yarn. As mentioned above, the multicomponent yarn may be twisted monofilament, twisted polyfilament, polyfilament or twisted / twisted yarn or combinations thereof. The multicomponent yarn may also be a twisted or knitted yarn.

In any case, the warp yarn 22 (CD yarn) and the weft yarn 24 (MD yarn) are polyamide, polyester, polyetherketone, polypropylene, polyaramid, polyolefin, polyphenylene sulfide (PPS) and polyethylene terephthalate (PE).
T) resins, and extruded from synthetic polymeric resin materials such as copolymers thereof, and also incorporated into yarns according to techniques well known in the textile industry and especially in the paper machine textile industry.

The weft yarns 24 (MD yarns), in addition to having a plurality of individual yarns, also include heat-fusible yarns of at least one thermoplastic material, wherein the thermoplastic material constitutes a multicomponent yarn. It has a lower melting point than that of the individual yarns that it has. As a result, upon application of heat treatment at a temperature above the melting point of the heat soluble yarn but below that of the individual yarns of the multicomponent yarn, the thermoplastic material stiffens the multicomponent yarn and the seaming loops 18 formed therefrom. , And hold the individual threads of the multi-component thread tightly together. This ensures that the seaming loop formed by the multi-component yarn will maintain the correct orientation for the seaming and the required integrity. The thermoplastic material may be, for example, polyamide 66, low melting polyamide 6 or polyurethane.

As mentioned above, the multicomponent yarn comprises at least one thermofusible yarn of thermoplastic material.
That is, it may include one, two, three or more heat-fusible threads.
The heat soluble yarn may be monofilament or polyfilament, either of which may have a non-circular cross section. It may be an extruded thread or a thread cut from a film of thermoplastic material. It may also be a thread obtained or cut from a low melting polyamide or polyurethane nonwoven web. A nonwoven web of this type is available from Sharnet.

In the weaving of the fabric 20 by a modified endless weave, the weft threads 24 pass thereabout around the loop-forming pins while forming a seaming loop at one of the two lateral edges of the fabric 20 being woven. It is continuously weaved back and forth across the loom in the passageway that crosses the loom. The teachings incorporated herein by reference are available for weaving machine-seamable paper machine fabrics by several methods, modified endless weaves, as claimed in U.S. Pat. No. 3,815,645 to Codorniu. And can be used in the practice of the invention.

FIG. 4 is a cross-sectional view in the weft direction of the seam region of the fabric 20 taken at the end of the modified endless weaving process. The weft threads 24, and ultimately the MD threads of the fabric 20, are woven around the loop forming pins 26 in a continuous manner to provide the seaming loops 18.

It will be appreciated that the loop forming pin 26 must be removed to place the fabric 20 in a shape that allows it to be easily installed on a particular machine. Weft 24 (M
Since the (D yarn) is a multi-component yarn, the seaming loop 18 rotates from its ideal geometry, exemplifying a quadratic spiral effect, and also deforms as soon as the loop forming pin 26 is removed, It will also be appreciated that subsequent seaming may be difficult or impossible.

For this reason, the heat treatment to stiffen and harden the multi-component yarn is performed before the loop forming pin 26 is removed. However, it should be appreciated that heat treatment can be performed either before or after the fabric 20 is woven, or even during the yarn forming stage. Further, when the staple fiber batting material is sewn into the fabric 20, the heat treatment can be performed either before or after the stitching process, but the thermoplastic material of at least one heat-fusible yarn is staple fiber to the base fabric 20. A heat treatment following sewing is preferred for the purpose of improving the fixation of the batt material.

Industrial fabrics are made endless by entwining the splice loop 18 at one end of the fabric with that at the other end and by guiding the shaft through a passage defined by the intertwined splice loops 18. Be connected. Instead,
A seaming helix 28 is attached to the seaming loop 18 to connect the cloth 20 in the form of an endless loop, as shown in FIG. 5, another cross-sectional view of the seam region of the cloth 20 taken in the machine direction. May be used for.

More specifically, the splicing spiral 28 is entangled with the splicing loop 18 to form the connecting yarn 3.
Connected to it by 0. In this way, a cloth 2 having multi-component yarns in the machine direction
0 may be provided with monofilament seaming loops in the form of individual coils of seaming helix 28.

The splicing spiral 28 is preferably a single fiber spiral of a polyamide resin extruded. The diameter of the single fiber is, for example, 0.40 mm or 0.50 mm. During installation of the fabric 20 on the paper machine, the individual coils of the seaming helix 28, which are, for example, monofilaments, are easily intertwined with each other and guided by the guide shafts 32 through the passages defined by the intertwined coils. Be connected. A stuffing thread 34 may be inserted inside the seaming helix 28 to ensure that the seam region has similar properties to the rest of the fabric 20. The connecting yarn 30 and the filling yarn 34 may be the same type of yarn used as the warp yarn 22 (CD yarn) of the fabric 20. The axle 32 may be a single yarn of monofilament, multiple yarns of monofilament untwisted with each other, or twisted, twisted, co-woven or knitted, or MD yarns of the fabric 20. It may be one or more of the multi-component yarns described above for use as the (weft yarn 24).

Modifications to the above will be apparent to those of ordinary skill in the art, but would not result in a modified invention beyond the scope of the claims.

[Brief description of drawings]

[Figure 1]   1 is a schematic perspective view of an industrial fabric that can be seamed on a machine.

FIG. 2 is a schematic perspective view of both ends of an industrial fabric that is seamable on a machine before being connected to each other.

[Figure 3]   It is sectional drawing imaged in the warp direction of industrial cloth.

[Figure 4]   FIG. 5 is a cross-sectional view taken in the weft direction of the seam region of an industrial fabric.

FIG. 5 is a cross-sectional view of a seam region of an alternative embodiment of an industrial fabric, similar to that given in FIG.

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Claims (25)

[Claims] 1. A system of machine direction (MD) yarns and a direction perpendicular to the machine (CD
) In an industrial fabric consisting of a system of yarns: the yarns of the system of MD yarns have a rectangular shape with a length, a width, two surfaces, two longitudinal edges and two lateral edges. Is interwoven with the yarns of the CD yarn system to form an industrial fabric,
The MD yarn is a multi-component yarn consisting of a plurality of individual yarns and a heat-soluble yarn of at least one thermoplastic material, the at least one heat-soluble yarn having a lower melting point than that of the individual yarns. And therefore applying a heat treatment causes the multicomponent yarn to stiffen and the plurality of its individual yarns to be held together by the thermoplastic material of the at least one heat soluble yarn. Characteristic industrial cloth. 2. The industrial fabric can be closed endlessly by a loop seam when installed on a machine, wherein the yarns of the MD yarn system are deformed with the yarns of the CD yarn system. Woven by the endless weaving technique, the MD yarns extend continuously back and forth the length of the industrial cloth between the two lateral edges to one of the two lateral edges. Forming a first plurality of seaming loops along and a second plurality of seaming loops along another one of the two lateral edges, whereby the industrial fabric comprises the first plurality of seaming loops. Endlessly connected by entwining a seaming loop with the second plurality of seaming loops and by guiding a shaft through a passage defined by the entangled seaming loops to close the loop seam. Contract Industrial fabric as claimed in claim 1. 3. The industrial fabric can be closed endlessly by pin seams when installed on a machine, wherein the yarns of the MD yarn system and the yarns of the CD yarn system are plain weave. A first plurality of seaming loops along one of the two lateral edges and a second plurality of seaming loops along the other of the two lateral edges. Along the two lateral edges, the MD yarns are folded back and woven into the industrial fabric so that the industrial fabric includes the first plurality of seaming loops. 2. Endless connection by interlocking with two or more seaming loops and by guiding an axle through a passage defined by the interlocking seaming loops to close the pin seam. Industrial cloth. 4. The yarns of the system of MD yarns are woven with the yarns of the system of CD yarns by plain weave technology, wherein the two lateral edges of the industrial fabric form the industrial fabric in an endless form. An industrial fabric according to claim 1, wherein the fabrics are connected to each other by a woven seam for placement in the fabric. 5. The industrial cloth according to claim 1, wherein the multi-component yarn is a twisted monofilament yarn. 6. The industrial cloth according to claim 1, wherein the multi-component yarn is a twisted multi-fiber yarn. 7. The industrial cloth according to claim 1, wherein the multi-component yarn is a multi-fiber yarn. 8. The industrial fabric of claim 1, wherein the multi-component yarn is a twisted / twisted yarn. 9. A yarn selected from the group consisting of twisted monofilament yarns, twisted polyfilament yarns, polyfilament yarns, twisted / twisted yarns and combinations thereof, The industrial cloth according to claim 1, wherein 10. The industrial cloth according to claim 1, wherein the multi-component yarn is a knitted yarn. 11. The industrial cloth according to claim 1, wherein the multi-component yarn is a twisted yarn. 12. The industrial fabric of claim 1, wherein the individual yarns of the multi-component yarn are extruded from a polymeric resin material. 13. The polymer resin material is selected from the group consisting of polyamide, polyester, polyetherketone, polypropylene, polyaramid, polyolefin, polyphenylene sulfide (PPS) and polyethylene terephthalate (PET) resins, and copolymers thereof. 13. The industrial cloth according to claim 12, 14. The industrial fabric of claim 1, wherein the thermoplastic material of the at least one heat soluble yarn is selected from the group consisting of polyamide 66, low melting polyamide 6 and polyurethane. 15. The at least one heat soluble yarn is a monofilament.
The industrial cloth described in. 16. The at least one heat soluble yarn is multifilament.
The industrial cloth described in. 17. The industrial fabric of claim 1, wherein the at least one heat soluble yarn is a yarn cut from the film of thermoplastic material. 18. The industrial fabric of claim 1, wherein the at least one heat soluble yarn is a yarn of non-woven material. 19. The industrial fabric of claim 1, wherein the CD yarn is also the multicomponent yarn. 20. The industrial fabric of claim 1, further comprising at least one layer of staple fiber batt attached to one of the two surfaces. 21. At least one connecting yarn entwined with said first plurality of said seaming loops at one of said two lateral edges of said industrial fabric and extending in a direction orthogonal to the machine. A first seaming helix having a plurality of coils attached thereto; and entwined with the second plurality of the seaming loops at another one of the two lateral edges of the industrial fabric And a second seaming helix having a plurality of coils attached thereto by at least one connecting thread extending in a direction orthogonal to the machine, whereby the industrial fabric comprises the first seam. Entangling the coil of the mating helix with the coil of the second seaming helix and guiding the shaft through a passage defined by the coils entwined to close the loop seam. The industrial fabric according to claim 2 or 3, which is connected in the form of a dress. 22. The first and second seaming helices are monofilament helices.
The industrial cloth according to 1. 23. The industrial fabric according to claim 22, wherein the monofilament helix is extruded from a polyamide resin. 24. The industrial fabric of claim 21, further comprising at least one stuffing thread inside the first seaming spiral. 25. The industrial fabric of claim 21, further comprising at least one stuffing thread inside the second seaming spiral.