FI119065B - Paper machine fabric with flat machine direction yarns - Google Patents

Abstract

A papermakers fabric having a system of flat monofilament machine direction yarns 22,23 (hereinafter MD yarns) interwoven with a system of cross machine direction yarns 21a,21b (hereinafter CMD yarns). The MD yarns 22,23 have an aspect ratio of greater than 3:1. Furthermore the MD yarns are vertically stacked with at least paired upper 22 and lower 23 MD yarns which weave over and under CMD yarns 21a,21b in such a manner that when a lower MD yarn 23 weaves over a CMD yarn 21a an upper MD yarn 22 is weaving (or floating) over the lower MD yarn 23. This ensures that no knuckles are apparent on the upper surface of the fabric. The weave gives rise to a warp-fill in the range of 80-125%.

Description

119065

PAPER MACHINE FABRIC WITH FLAT MACHINE DIRECT YARNS

This invention relates to fabrics for a papermaking machine, and particularly to fabrics comprising flat monofilament yarns.

BACKGROUND OF THE INVENTION Paper machines generally comprise three parts: forming, pressing and drying. Paper machine fabrics are used to transport a continuous sheet of paper through the papermaking equipment when making paper. The requirements and desirable characteristics of the paper machine fabrics vary depending on the part of the machine in which the 10 fabrics are used.

With the development of synthetic yarns, shaped monofilament yarns have been used to form papermaking fabrics. For example, U.S. Patent 4,290,209 discloses a fabric that is woven from flat monofilament yarns; U.S. Patent No. 15,475,420 describes a nonwoven structure wherein the fabric of a papermaking machine comprises spirals made of flat monofilament yarns.

Numerous tissues are known in the art and are used to achieve various results. For example, U.S. Patent No. 20,438,788 discloses a drying fabric having three layers of machine transverse yarns woven with flat machine direction monofilament yarns so that unbound yarn runs are formed on both the top and bottom surfaces of the fabric. * "* The yarn runs tend to form a smooth surface on the fabric.

** “25 Permeability is an important criterion in the fabric structure of papermaking machinery. Especially fabrics that are made to run at high speeds in modern drying equipment have t · · • \! it is desirable to provide drying fabrics having a relatively low permeability.

US Patent 4,290,209 discloses the use of flat monofilament yarns woven side by side to provide a fabric with reduced permeability.

Although flat warp yarns are woven side by side with each other, additional means, such as filler yarns 35, are required to reduce fabric permeability. As mentioned in the said patent • · · *. it is advisable to avoid the use of fluffy, bulky filling yarns to reduce the permeability, as noted in the Scrap, as they render the fabric susceptible to foreign matter or water retention.

U.S. Pat. No. 4,290,209 and U.S. Pat. No. 4,755,420 address practical limitations in the aspect ratio of machine directional warp yarns defining the fabric structure of the fabric (ratio of section width to height). The highest practical aspect ratio apparent from these patents is 3: 1, and the aspect ratio is preferably less than 2: 1.

U.S. Patent 4,621,663, assigned to the holder of the present 10 inventions, describes one attempt to use high aspect ratio yarns (5: 1 and larger) to determine the surface of a papermaking dryer fabric. As described in that patent, a woven base fabric is provided to support high aspect ratio surface yarns. The woven base fabric comprises conventional circular yarns and provides structural support and stability to the fabric described in that patent.

U.S. Patent 4,815,499 describes the use of flat yarns in connection with a forming fabric. This patent describes a composite fabric consisting of an upper fabric and a lower fabric bound together by binding yarns. The aspect ratios used for flat machine direction yarns in both the top and bottom fabrics are well below 3: 1.

• · · · In use, paper machine fabrics are formed into endless Γ "25 straps. There are weaving techniques available to weave endlessly. · · · · · ;; there are practical limitations * on the total size of endless woven fabrics and I * ·: *, · Related installation problems, and not all paper-making equipment is designed to receive 30 fabrics at a time.

Flat woven fabrics are often delivered with • · ·. ···. they have opposing ends that are sewn together when the fabric is • installed in the papermaking equipment. Typically, the other end of the fabric is threaded through a winding web defined by the papermaking equipment and then joined. at the opposite end to form a continuous strap.

. Various sealing techniques are well known in the art.

• · * * · One known method of seaming is to form machine direction yarns at each end of the fabric into a set of loops. Thereafter, the loops of the 3 119065 fabric ends are joined together during fabric installation to define a channel through which the connecting pin is pushed to lock the ends together.

For example, U.S. Patent Nos. 4,026,331, 4,438,789, 5,446,149, 4,846,231, 4,824,525, and 4,883,096 disclose various pin seams using machine direction yarns to form end loops. In each of these patents, however, the machine direction yarn protrudes from the end of the fabric and weaves back into the fabric adjacent to itself. Thus, the loops have 10 natural rotational or torsional factors and are not completely perpendicular to the plane of the fabric. U.S. Patent 4,883,096 explicitly addresses this problem.

SUMMARY AND OBJECTIVES OF THE INVENTION The present invention provides a papermaker's fabric comprising a machine transverse or KPS yarn system interwoven with a machine directional or KS yarn system 20 in a selected repeat pattern wherein the KS yarn system comprises at least a first layer of KS monofilament flat yarns, the yarn system comprises KPS. a layer of yarn having first diameter yarns alternating between yarns having a second, larger diameter; 25 and said first layer repeat pattern of KS yarns have two types of KS yarns, with the first type of KS yarns having runs that weave over three KPS yarns each time and weave next, under said first, KPS yarn having a first diameter, forming a loop, and the second type of KS yarns has a displacement of two KPS yarns relative to the first type and has a run. . *, which in each repetition weave over three KPS yarns and pass through the following, said first diameter:. Underneath the KPS yarn forming a joint, said first layer of KS yarns causes curling of the joints in the woven KPS yarns.

* * Advantageous embodiments of the invention are shown as being dependent on • · ·. * ·; in the claims.

119065 4

In a preferred embodiment, the fabric comprises a second layer of flat monofilament KS yarns such that the first layer of KS yarns defines one side of the fabric and the second layer of KS yarns defines the opposite side of the fabric.

In one embodiment, the second layer of KS yarns consists of two types of KS yarns such that the first type of KS yarns weave over every fourth KPS yarn to form a hinge, and the second type of KS yarns 10 has two KPS yarns offset with the first type and weaves every repetition over every fourth KPS yarn forming a joint, said second layer of KS yarns causing curling in the KPS yarns woven into the joints.

In one embodiment, said KS yarn system comprises yarns in pairs, vertically aligned.

In one embodiment, the actual warp fill of said KS yarn system is in the range of 160 to 250%.

In one embodiment, said system of KPS yarns has only said layer of KPS yarns in which the first and second diameter yarns alternate.

·· * j. BRIEF DESCRIPTION OF THE DRAWINGS t *** 25 Figure 1 is a schematic representation of a papermaking fabric which is not in accordance with the present invention; * '* Figure 2 is a cross-section of the fabric shown in Figure 1 ·· · • * #! along line 2-2; Fig. 3a is a cross-sectional view of the fabric * · * 30 of Fig. 1, taken along line 3-3; Fig. 3b is a cross-sectional view of a previously known tissue structure; Figure 4a shows the direction of the yarns of the fabric shown in Figure 1; ί background after the fabric is finished, showing only two: ***; 35 overlapping KS yarns; «·· *. Figure 6 is a schematic representation of an embodiment of a fabric made in accordance with the present invention; • · * * · *. Fig. 7 is a cross-sectional view of the fabric shown in Fig. 6, taken along line 7-7; 119065 Fig. 8 is a cross-sectional view of the fabric shown in Fig. 6, taken along line 8-8; Fig. 9 is a perspective view of a portion of the fabric shown in Figs. 6-8; Figure 10 shows the orientation of the yarns in the finished fabric shown in Figure 6, showing the end loop formed by a single KS yarn; Fig. 11 is a top plan view of opposite ends of the fabric formed according to Fig. 6 just before the ends are stitched together.

Detailed description

Referring to Figures 1, 2 and 3a, there is shown a papermaking fabric 15 of a papermaking machine comprising upper, middle and lower ply cross-machine yarns 11, 12, 13 (hereinafter KPS) woven with the KS yarn system 14-19. , which are woven sequentially according to the selected repeat pattern. The KS system comprises upper KS yarns 14, 16, 18 which coincide with KPS yarns 11, 12, and lower KS yarns 15, 17, 19 which interweave with KPS yarns 12, 13.

The upper KS yarns 14, 16, 18 define unbound. yarn runs on the upper surface of the fabric 10 by weaving over two upper kahden "25 layers of KPS yarn 11 and dropping into the fabric to form an internal joint * 9 · ** · j below one middle layer of KPS yarn 12 and * * under one KPS yarn 11 and then rising to the surface of the fabric 91 »: *, · to continue the repetition of the yarn. The unbound runs of the upper KS yarns 14, 16, 18 ··» over the upper layer KPS yarns 11 are 30 staggered so that all upper and middle layer KPS yarns 11, 12 are held tissue.

*, * ', · * · As will be appreciated by those skilled in the art, the weaving pattern shown in FIGS. 1, 2 and 3a results in a functional fabric band on the upper surface of the fabric. Although the twill 35 yarn twill over two yarns shown in Figures 1, 2 and 3a is a preferred application, those skilled in the art * 99 * will appreciate that the yarn run length, KS- [[number of yarns per repeat pattern, and order of KS yarns • · * * · select as desired to produce other templates, twill or non-twill.

6 119065

As best seen in Figures 2 and 3a, the lower KS yarns 15, 17, 19 are woven directly below the respective upper KS yarns 14, 16, 18 in a vertically overlapping relationship. The lower yarns are woven into their respective upper yarns. Each of the lower KS yarns 15, 17, 19 runs underneath the two KPS yarns 13 of the lower layer, rises to the fabric over one of the KPS yarns 13 and forms a center pivot about one KPS yarn 12, returning to the lower surface of the fabric to continue repeating 10 KPS yarn 13 under.

For each pair of overlapping yarns, the internal joint formed by one KS yarn forming a middle layer around the KPS yarns 12 remains hidden by the running of the other KS yarn. For example, in Figures 1 and 3a, the lower KS yarn 15 is illustrated to weave a joint 15 over the KPS yarn 12, while the KS yarn 14 weaves its run over the KPS yarns 11, thereby concealing the inner joint of the lower KS yarn 15. Similarly, in Figures 1 and 3a, the upper KS yarn 18 is illustrated to weave a hinge beneath the KPS yarn 12, while the lower KS yarn 19 hides as it runs over the KPS yarns 13. The upper KS-20 yarns 14, 16, 18 are woven side by side relative to one another. This preserves their parallel machine direction and reduces permeability. Such dense weaving of machine direction yarns is known in the art as 100% warp filler as described in U.S. Patent No. 4,290,209. As described in (and used herein), the actual warp • ♦ · Σ "ί number in a woven fabric can vary from about 80 to 125% ♦ in one layer and still be considered 100% warp-j fill.

; ***; The narrowing of the KS yarns 14, 16, and 18 also forces the KS yarns 15, 17, 19 to overlap below their respective KS yarns 14, 16, 18. Preferably, the KS yarns 15, 17, and • I · 19 are the same size as the KS yarns 14, 16, and 18, so that they are · · * ··· * woven into a 100% warp filling. This results in:: *: that the overall fabric of the preferred embodiment has 200% ··· i 35 warp filling of KS yarns.

Since the lower KS yarns 15, 17, 19 are preferably also woven for * 100% warp filling, they also have the effect of keeping the upper KS yarns 14, 16, 18 in overlap with the lower KS yarns. with respect to yarns 15, 17, 19. Thus, the respective 7119065 KS yarn pairs 14 and 15, 16 and 17, 18 and 19 are double locked in place, thereby increasing fabric stability.

As disclosed in U.S. Patent No. 4,290,209, it has been found that machine-direction flat yarns weave in tighter contact around the machine's transverse yarns than circular yarns. However, a 3: 1 aspect ratio was considered a practical limit for such woven yarns in order to maintain overall fabric stability. The present 10 overlap KS yarn system maintains fabric stability and machine directional strength and allows the use of yarns with an added aspect ratio, preferably in the range 2: 1-6: 1, to more effectively control the permeability.

The high aspect ratio of KS yarns means reduced permeability. High aspect ratio yarns are wider and thinner than conventional flat yarns with an aspect ratio of less than 3: 1 and having the same cross-sectional area. Equally large cross-sectional area means that comparable yarns have substantially the same linear strength. The greater width of the high aspect ratio yarns means less gaps in the width of the fabric than conventional yarns, so that there are fewer openings in the fabric through which fluids can flow. The relative thinness of the high aspect ratio yarns f · · ·. · Allows the KS flat yarns to be wound, i.e. j * ”25, more efficiently to bind the cross machine direction yarns, reducing the size of the space between the machine direction and machine direction yarns.

For example, Fig. 3b shows a single-layer, flat machine-directional weave fabric 30 of warp yarns having a width of 1.5 units and a height of 1 unit, i.e., an aspect ratio of 1.5: 1. Such a fabric could be replaced by a fabric having the present dual system of overlapping KS yarns, K · · · · · having a KS yarn twice as wide as 35 or 3 units, and half as large as 0, 5 units. Thus, such KS yarns have a quadruplicate inner. 6: 1 as shown in Figure 3a.

• <· * · * ϊ Thinner, wider KS yarns control the permeability more efficiently while maintaining the machine-directional strength of the fabric 8 119065, since the cross-sectional area of the KS yarns remains the same across the fabric width. For the above example, illustrated in Figures 3a and 3b, the conventional KS yarn single system fabric 5 has six conventional adjacent flat yarns of 9 units of width of 9 square units, i.e. 6 x (1 y. x 1.5 yrs.). The thinner, wider, high aspect ratio yarns, woven side by side as overlapping KS yarns, define a fabric having three 10 pairs of overlapping KS yarns at 9 weft units. Thus, such a fabric also has a cross-sectional area of 9 units, i.e., (3 x (0, 5 y. X 3 y.)) + (3 x (0, 5 y. X 3 y.))) By 9 units of fabric width.

In one example, the fabric was woven according to Figures 1, 2 and 3, wherein the KPS yarns 11, 12, 13 were polyester monofilament yarns of 0.6 mm diameter woven with KS yarns 14-19, which were flat polyester monofilament yarns of 1.12 mm wide and 0.2 mm high. Thus, the aspect ratio of flat KS yarns was 5.6: 1. The fabric was woven using 48 weft / inch and weaving machine at 40 PLI (pounds / linear inch) and 12.5 KPS punch / inch / layer (three layers). ).

The fabric was heat-fixed in a conventional heat-fastening apparatus under temperature, tension and time conditions of *** 25 in known areas for polyester monofilament yarns.

• «· ··· | For example, conventional polyester fabrics are heat-bonded

* * · With parameters between 340 - 380 ° F, stress 6-15 PLI

M »; (pounds per linear inch) and time 3-4 minutes. However, due to their stable structure, the fabrics of the present invention are ··· 30 more permissive in terms of thermal attachment parameters.

The fabric had a warp factor of 6000 PLI (pounds per square inch) • · · ** as measured by the American Society for Testing and Materials J ASTM D-1682-64. The fabric stretched to less than 0.2%; ***; 35 during thermal fitting. This result makes the fabrics ready- ·· «*. In accordance with the present invention, it is highly reliable when it achieves the desired measurement properties as compared to conventional ones. *: for fabrics.

The resulting heat-bonded fabric had 12.5 9119065 KPS yarns / inch / layer with a warp fill of 106% for both the upper and lower KS yarns, resulting in an actual warp fill of 212%. The finished fabric has a permeability of 83 CFM as measured by ASTM D-737-75.

As shown in Figure 4a, when the fabric 10 is woven, three layers of KPS yarns 11, 12, 13 are compressed. This compression combined with the relatively thin dimension of the KS yarns lowers the caliber of the fabric. Thus, the overall caliber of the fabric can be considered relatively low and not significantly higher than that of conventional fabrics woven without overlapping KS yarn pairs. In the example above, the finished fabric had a caliber of 0.050 inches.

It will be appreciated by those skilled in the art that if either the upper KS yarns 14, 16, 18 or the lower KS yarns 15, 17, 19 are woven at 100% warp fill, the total warp fill on the overlapping fabric is significantly more than 100%, which contributes to reducing fabric permeability.

This fabric with overlapping KS yarns is found to have a significantly higher warp fill percentage than the hinge-20 with an actual warp fill of 125% non-overlapping KS yarns, as a result of stitching and lateral waving of the warp filaments. Although 200% warp filling is most suitable, the fabric can be woven with 100% filling • · «· for either the upper or lower KS yarns with a smaller filler j *]! 25 teas for other KS yarns using yarns other than '· * | as wide as those KS yarns woven with 100% warp filling. For example, the top yarns 14, 16, 18 could be 1 · ♦ ·: V units wide, while the bottom yarns 15, 17, 19 would be 0.75 units ί Ϊ wide, which would result in a fabric having a warp fill of 30 175%.

Such variations can be used to provide an intermediate degree of permeability. Alternatively, such variations • · * y could be used to make the forming fabric. In such a case, the lower KS yarns would be woven with 100% warp: ***; 35 Fill To Determine Fabric Machine Side And Upper KS Yarns ··· * Woven With Substantially Lower Fill Percentage To Obtain] | more transparent papermaking fabric.

• · · • · ♦ • f

Referring to Figures 6, 7 and 8, a preferred embodiment of fabric 20 made in accordance with the present invention is shown. The papermaker's fabric 20 consists of a single layer of KPS yarns 21a, 21b woven with a system of overlapping KS yarns 22-25 that are woven in the selected binding pattern. The KS yarn system comprises upper KS yarns 22, 24 which define yarn runs on the upper surface of the fabric 20 by weaving over three KPS yarns, forming a joint below the next one KPS yarn 21a, and then returning to run over the next three KPS yarns, .

The lower KS yarns 23, 25 are woven directly below the respective upper KS yarns 22, 24 in a vertical superimposed relationship. The lower KS yarns are woven in reverse of their respective upper KS yarns. Each lower KS yarn 15 23, 25 runs under the three KPS yarns, weaves upward around the next one KPS yarn 21a to form a joint, and then continues to run under the next three KPS yarns in the repetition pattern.

As shown in Figures 6 and 8, the joints formed by the lower KS yarns 23, 25 20 are covered by the thread runs formed by the upper KS yarns 22, 24. Similarly, the joints formed by the upper KS yarns 22, 24 remain covered by the thread runs formed by the lower KS yarns 23, 25.

····. ·, The caliber of the fabric Γ "25 near the hinge region shown in Figure 8 tends to be somewhat larger than that of the non-hinged KPS yarns 21b shown in Figure 7. However, the KPS yarns 21a around which the joints are formed become curled, which reduces the caliber of the fabric in the region shown in Figure 8. 30 In addition, the KPS yarns with a slightly larger diameter preferably, the yarns are used as KPS yarns 21b, shown in Fig. 7 * · * ·, ··· ^, and no KS yarns are woven around the joints, to weave the fabric calipers *; *, preferably with thicker KPS yarns. the diameter of the yarn 21b • · · · · · is equal to the diameter t of the thinner KPS yarn 21a and the thickness t of the KS yarns.

· * · *. In one example, the fabric was woven as shown in Figures 6-9, with the KPS yarns 21a, 21b having a diameter of 0.6 · · · * · * and 0.8 mm polyester monofilament yarns woven together in KS yarns 22-25. with flat poly-ester monofilament yarns of 1.12 mm in width and 0.2 mm in height. Thus, the aspect ratio of flat KS yarns was 5.6: 1. The fabric was woven using a total of 48 warp yarns per inch at a weaving machine tension of 40 PLI (pounds per linear 5 inch) and 20 KPS punching yarns per inch. The average permeability was 90 CFM in the resulting fabric.

In another example, the fabric was woven as shown in Figures 6, 7 and 8, wherein the KPS yarns 21a, 21b were polyester monofilament yarns of 0.7 mm diameter and woven with 10 KS yarns 22-25, which were flat polyester monofilament yarns of the width was 1.12 mm and the height 0.2 mm. Thus, the aspect ratio of flat KS yarns was 5.6: 1. The fabric was woven using 22 KPS punch yarns per inch. The fabric was heat fixed using conventional procedures. The fabric had a factor of 6000 PSI. The fabric stretched to less than 0.2% length during thermal attachment. The resulting fabric had 22 KPS yarns per inch with 106% warp filling for both the upper and lower KS yarns, resulting in 212% actual warp filling for the fabric. The finished fabric had a caliber of 0.048 inches and an air permeability of 60 CFM.

As best shown in Figure 9, high aspect ratio yarns 22-24 efficiently bind KPS yarns 21a in the fabric structure. The amount of this binding can be expressed as the degree of the touch arc ja and the area of the contact binding, KSP follows: · · 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 9,999 30 where d = diameter of the KPS yarn Θ = the degree of arc of contact between KS and KPS yarns • · 9 M ti * “1 w = width of the KS yarn • · I:: n = constant pn ♦ ·· 1. ···. 35

The degree of arc of the KS yarns 22-25 in contact with M · 1 · * with the KPS yarns 21a depends on the density of the KPS yarns *, 1 ·; tissue. In the example above, using alternately 0.6 mm and 0.8 mm KPS yarns with 0.2 mm thick KS yarns, the contact arc degree can be maintained within a preferred range of 60-180 ° by varying the stroke rate of the KPS yarns from 14 strokes per minute. up to 28.22 beats per inch.

In a preferred embodiment, where the stroke rate is 20 strokes at 5 per inch, the degree of contact arc Θ is approximately 101 °. This results in a binding contact area of approximately 0.79 mm 2 at each of the fabric joints.

The use of high aspect ratio yarns of the applicant, i.e. yarns having a width to thickness ratio of at least 3: 1, results in an increased bonding contact of the flat KS yarns with the KPS yarns 21a. A comparative example is obtained by converting the equation for binding bond, KSP, to be determined by the thickness of the KS yarns.

Since the width w of the KS yarn is equal to the packing t of the KS yarn t multiplied by the aspect ratio, w> 3t for yarns with an aspect ratio greater than 3: 1. Thus, fabrics made in accordance with the present invention using high aspect ratio KS yarns have an increased binding of KPS yarns with KS yarns such that: 20 KSP> n d (®) 3t 360 ° 4 • 44 4 • •• 4

As shown best in Fig. 10, the seam loops form 4 I *** 25 upper KS yarns 22. Corresponding lower KS yarns 23 cut the selected distance from the fabric end and upper KS yarns 22 weave * * is released into the 23 space of the lower-cut lower KS yarns.

The upper KS yarns 24 are similarly woven backward into the space released by cutting backward the lower KS yarns 25. As best seen in Figure 10, however, the upper KS yarns 24 are woven backward at the outermost end of the KPS yarn 21b * “ against.

4 · j As shown in Figure 11, a series of seaming loops are formed by: *** · 35 at each opposite end of the fabric 27, 28. When the fabric • 44 * is installed in the papermaking apparatus, the corresponding end loops formed by the KS yarns 4 ···· 22 are matched 29 push 4 4 «· * 'niiden through them to lock the matching running sets.

Since the seaming loops L are formed by weaving backwardly the yarns 22 of KS-13 11906 5 directly below itself, no lateral rotation or torsion is applied to the loop and the loops are perpendicular to the plane of the fabric. This facilitates the matching of the loop sets of opposite ends of the fabric 27, 28.

Perpendicular loops are particularly advantageous when the KS yarns 22, 24 form 100% warp fill and adjacent loops are separated by individual KS yarns having the same width as the KS loop yarns 22, as seen in Figure 10. Lateral rotation or torsion in seam loops makes the sealing step 10 more difficult, especially when the loop receiving spacing between the loops of one end of the fabric is substantially the same width as the loops at the opposite end of the fabric and vice versa.

Referring to the fabric shown in Figs. 6-11, the loop-forming KS yarns 22 preferably are woven backward about 2 inches, while the non-loop-forming KS yarns 24 are preferably woven backward 1 inch.

Various other tissue designs utilizing the tissue structure of the present invention may be formed within the scope of this invention. Such fabrics are readily formed in accordance with the present invention.

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Claims (6)

14 1 19065 A woven paper machine fabric comprising a machine cross-machine or KPS yarn system interwoven with a machine-machine or KS yarn system in a selected repetition pattern, wherein the KS yarn system comprises at least a first layer of KS monofilament flat yarns (22, 24), characterized by that the KPS yarn system comprises a KPS yarn layer 10 (21a, 21b) wherein the yarns (21a) having a first diameter and the yarns (21b) having a second, larger diameter alternating; and said first layer repeat pattern of KS yarns has two types of KS yarns; Wherein the first type (22) of KS yarns has strands weaving over each of the three KPS yarns (21b, 21a, 21b) and weaving beneath the next KPS yarn (21a) having said first diameter; 20 and the second type (24) have KS yarns having a displacement of two KPS yarns relative to the first type, and have runs that weave three KPS yarns each time. (21b, 21a, 21b) and passes under the next said first KPS yarn (21a) having a diameter of 21 to form a hinge; • ·:, · ♦ wherein said first layer of KS yarns ai *: 1 2 3 4 5 ·: warps the crimp in the woven KPS yarns (21a). ·· «• · · • · •» .1 ··. Fabric according to claim 1, characterized in that it comprises a second layer of flat monofilament KS. yarns (23, 25) such that a first layer of KS yarns (22, 24) • I · j [· 1 defines one side of the fabric, and a second layer of KS yarns · ··· 1 layer defines fabric opposite j1. side. Fabric according to Claim 2, characterized in that the second layer of KS yarns (23, 25) is formed by two KS yarns of the type I1.j. (25) the type weaves every repetition over every fourth KPS yarn is 1 19065 (21a) forming a joint; and the second type of KS yarns (23) has a displacement of two KPS yarns relative to the first type and weaves over every fourth KPS yarn (21a) to form a joint; wherein said second layer of KS-5 yarns (23, 25) causes curling in the woven KPS yarns (21a). Fabric according to claim 2 or 3, characterized in that said system of KS yarns has yarns 10 in pairs superimposed vertically. Fabric according to Claim 2, 3 or 4, characterized in that said KS yarn system has an effective warp fill in the range of 160 to 250%. 15 Fabric according to one of the preceding claims, characterized in that said KPS yarn system has only said layer of KPS yarns in which the first and second diameter yarns alternate. 20 · * ·· 1. Vävt pappersmaskintyg flashes omfattar ett system av trädar Mf 25 tvärs maskinriktningen (CMD-trädar) samvvda med ett sy- • · · · Stem av trädar i maskinriktningen (MD-trädar) i en tremendously • Ϊ * ·! repetitionsmönster, varvid systemet av MD-trädar omfattar · *** · ätminstone et första lager f loading MD-monof ilamentträdar (22, • ·, ···, 24), kännetecknat därav, att • · 30 systemet av CMD-trädar omfattar that lager CMD tread,, (21a, 21b) color tread (21a) med en första diameter förekom- * · · * · * · mer tread med trädar (21b) med an andra, större diameter; och • · '. i repetitionsmönstret för nämnda första lager MD-trädar * ··! , ···, 35 förekommer tvä typer av MD-trädar; • · "* varvid den första typen (22) MD-trädar har lopen lively i ***** shadow repetition vävs över tre CMD-trädar (21b, 21a, 21b) och ϊ, * · ί vävs under feljande CMD-träd (21a) I am looking at this första typen, ild den endra; 16 1 1 9065 och den andra typen (24) av MD-trädar bar en förskjut-Ning om tvä CMD-trädar i förhällande account den första typen, och den lop lopka CMD-trädar (21b, 21a, 21b) och vävs under feljande CMD-träd (21a) 5 blades har nd första diameter, bildande en led; trädar (21a) is a busy leader. 2. Tyg enligt patent krav 1, kangnetecknat davav att den omfat-10 tar et andra lager flata monofilament MD-retractor (23, 25), att det första lagret MD-retractor (22, 24) definierar tygets ena sida, och det andra lagret MD-trädar (23, 25) definierar tygets motsatta sida. 3. Tyg enligt patentkrav 2, kännetecknat därav att det andra lagret MD-trädar (23, 25) molded typer MD-träd, att den första typen MD-trädar (25) i shield repetition vävs över var fjärde CMD-träd (21a) bildande en led; och den and typen MD-trädar (23) har en förskjutning om tvä CMD trädar i 20 förhällande account den första typen och i shade repetition vävs över var fjärde bildande en led; the colors such as andra lager MD rider (23, 25) förorsakar rynkning hos de, CMD rider (21a) lively. * ·· MM ··· ··· * 25 4. Tyg enligt patentkrav 2 eller 3, kännetecknat därav att i • «:, · · such system av MD-trädar finns trädar blazing ligger flock i * ϊ ** ϊ jämnbredd vertically for the fort. ·· · • I I • I • ·, ···, 5. Tyg enligt patentkrav 2, 3 eller 4, kännetecknat därav att M «* 30 den reel varpfyllnaden hos such MD-trädsystem or inom .. intervals 160 * 250%. ::: • · ··· • · *. «« * 6. Tyg enligt nägot av föregäende patentkrav, kännetecknat • · '. därav, att det i nämnda system av CMD-trädar finns itself M * «. · * ·. 35 such lager CMD-trädar, i lightning trädar med en första och en • · · * andra diameter förekommer tread. e • e i ·. ·: