WO2012041962A1

WO2012041962A1 - Belt for a machine for producing web material, in particular corrugated board

Info

Publication number: WO2012041962A1
Application number: PCT/EP2011/066984
Authority: WO
Inventors: Jean Alphonse Marie Rouhling
Original assignee: Voith Patent Gmbh
Priority date: 2010-10-01
Filing date: 2011-09-29
Publication date: 2012-04-05
Also published as: DE102010041888A1

Abstract

The invention relates to a belt for a machine for producing web material, in particular corrugated board, comprising a belt body (20) with a woven structure with first threads (30, 32, 34, 36) that extend in a belt longitudinal direction (L) and second threads (38, 40) that extend in a belt lateral direction. At least some of the first threads (30, 32, 34, 36) and/or some of the second threads (38, 40) have floats (T) over at least two threads (40) of the respective other type on a machine contact side (M) of the belt. The invention is characterized in that at least some of the threads (30, 32, 34, 36) that have the floats (F) on the machine contact side (M) are designed as monofilament threads.

Description

a machine for the production of web material,

especially corrugated board

description

The present invention relates to a belt for a machine for producing web material, in particular corrugated board, comprising a belt body having a weave structure with extending in a band longitudinal direction first yarns and in a cross-belt direction extending second yarns, wherein at least a portion of the first yarn or / and a portion of the second yarns on a machine contact side of the belt has floats over at least two yarns of the other type. Such a known from DE 32 09 118 A1 band for a machine for the production of corrugated cardboard is shown in Fig. 2 in longitudinal section. The band 10 has a web body 20 formed with a woven structure. The weave structure of the band body 20 is formed with a total of four fabric layers. These are essentially provided by first yarns 18 extending in a belt longitudinal direction L and second yarns 16 extending transversely to the belt longitudinal direction L and arranged in four planes in a thickness direction D of the belt 10. The first yarns 18 each run between the uppermost and the lowest level of the second yarns 16. The first yarns 18 and the second yarns 16 may be constructed as monofilament yarns in this known belt 10. In principle, however, also twisted multifilament yarn or spun yarns can be used.

At a machine contact side M, with which the belt 10, which is provided in an endless configuration during operation, comes into contact with various drive or deflection rollers of a corrugating machine, further first yarns 12 'extending in the longitudinal direction L of the belt 10 are located, as well as transversely to the belt longitudinal direction L extending second yarns 14 'are arranged. These first yarns 12 'form tie-down points A with second yarns 16 of the belt body 20 and floatations F which are respectively free between these two tie-down points A and machine-facing side M. The floats F each cover three second yarns 14', with floats F of immediately adjacent first yarns 12 'on the machine contact side M in the extension direction of these first yarns 12' are offset from one another. In particular, when all floats F have the same length, this means, of course, that the bonding points A of immediately adjacent first yarns 12 'are offset from each other.

The first yarns 12 'used for providing the floats F and also the second yarns 14' connected thereto by the band body 20 are formed in this known band as spun yarns, as multifilament yarns or bulking yarns. Due to their voluminous structure, they provide a comparatively soft surface protecting the belt body 20, which is also intended to contribute to the slip occurring in contact with the drive and deflection rollers and thus also the wear of the belt 10 resulting from the contact with these rollers to reduce.

It is the object of the present invention to provide a belt for a machine for producing sheet material, in particular corrugated cardboard, which has a higher wear resistance.

According to the invention, this object is achieved by a belt for a machine for producing web material, in particular corrugated board, comprising a belt body having a weave structure extending in a band longitudinal direction first yarns and in a belt transverse direction extending second yarns, wherein at least a portion of the first yarn or / and a portion of the second yarns on a machine contact side of the belt has floats over at least two yarns of the other type. It is further provided that at least a part of, preferably all, the floats on the machine contact side having yarns is formed as monofilament yarns.

By using monofilament yarns to form floats on the machine contact side, a significantly higher wear resistance is achieved as compared to the structure of the prior art described above. At the same time, the rolling friction resistance in the contact between the belt and the rollers driving and deflecting it is reduced, which lowers the energy required to drive the belt. On the other hand, it has been found that the use of monofilament yarns to form the floats on the machine contact side reduces the risk of slippage between the belt and the rollers that drive it. This makes it possible to reduce the tension under which such a belt is held in a machine for producing web material, for example, a corrugated cardboard machine, which contributes to a further increase in service life due to the lower load on the belt. Contributing in particular also to the fact that the Monofilamentgarn floats impressed on the machine contact side in the surface of the generally rubber material, textile material or coated textile material, in any case so compressible material formed roller surface, so that the driving force not only by frictional interaction, but also can be transmitted by generated in the region of such Eindrückung positive locking.

In order to be able to take into account in a further improved manner the requirements occurring in such a band, such as sufficient strength, sufficient void volume and reduction in the load on the machine contact side, it is proposed that the yarns having the machine contact side floats be tied to yarns of the band body. This means that the tape body as a structural whole, taking into account the requirements placed on it, can be built. The floats on the machine contact side are provided, at least in part, by yarns which themselves do not contribute to the structure or structural integrity of the tape body. Alternatively, it is of course also possible that the yarns comprising the floats on the machine contact side are yarns of the belt body. This structure is particularly advantageous if a comparatively thin band is to be provided. The band body can, depending on requirements, be formed with at least one, but preferably a plurality of fabric layers.

Further, the construction may be such that the yarns having the floats on the machine-contact side alternately have a bonding site with at least one yarn of the other type and a float over at least two yarns of the other species.

In order to provide a more or less closed surface on the machine contact side, in which there are no larger structures leading to irregularities in the barrel, it is proposed that floats formed in the direction of extension of these yarns are formed offset by directly adjacent yarns on the machine contact side. Further, it may be provided in this case that the bonding points immediately adjacent, the floats on the machine contact side having yarns in the direction of extension of these yarns are preferably offset from each other by a yarn of the other kind.

In an embodiment variant which is particularly advantageous for providing a regular structure on the machine contact side, it is proposed that yarns immediately adjacent to one another on the machine contact side are assigned to one another in pairs such that where one yarn of one pair has a float, the other yarn is the same Couple one over the length of the fleet of the has a yarn extending Abbindestelle.

In order to be able to provide on the side of the band which comes into contact with the web material to be produced, on the one hand wear-protected, on the other hand relatively flat, regular surface, it is proposed that at least a part of the first yarns and / or at least a portion of the second yarns on a web material contact side has floats over at least two yarns of the other type.

It may further be provided that floats on the web material contact side having yarns in the direction of extension of these yarns immediately consecutive floats and floats on the machine contact side having yarns between in the extension direction of these yarns directly successive floats each Abbindestellen on yarns of another kind and that at least a portion of the tying positions of the floats on the web material contacting side yarns is positioned in a thickness direction of the tape substantially over a tying point of the floats on the machine contact side having yarns.

Since such belts are generally used in endless configuration machines and have a comparatively long length in machines for producing web material, it is advantageous if yarns or / and floats on the machine material contact side yarns or / and floats are warp yarns or / and themselves extend in the tape longitudinal direction.

The present invention further relates to a machine for producing web material, in particular corrugated board, comprising at least one strip constructed according to the invention, on which the web material can be transported through different sections of such a machine or between such sections. The present invention will be described below with reference to the accompanying drawings. It shows:

Figure 1 is a perspective view of a belt provided in an endless configuration for a machine for producing web material.

Fig. 2 is a partial longitudinal sectional view of a band known in the prior art;

Fig. 3 is a partial longitudinal sectional view of a band constructed according to the invention;

Fig. 4 is a principle view of the band of Figure 3, viewed at the

Machine contact side;

Fig. 5 is a representation corresponding to Figure 3 of an alternative embodiment of a band.

Fig. 6 is a representation corresponding to Figure 3 of an alternative embodiment of a band.

Fig. 7 is a representation corresponding to Figure 3 of an alternative embodiment of a band.

Fig. 8 is a representation corresponding to Figure 3 of an alternative embodiment of a band.

Fig. 9 is a representation corresponding to Figure 3 of an alternative embodiment of a band.

FIG. 10 is a partial cross-sectional view of the belt of FIG. 9 taken along a line X - X in FIG. 9. FIG. FIG. 1 shows in perspective view a belt 10 which can be used in an endless configuration in a machine for the production of web material, in particular corrugated board. The band 10 is generally provided as a woven band. The ends resulting from the weaving process are connected together in a seam region 22, for example by using a connecting wire or the like. The band 10 is generally elongated in a band longitudinal direction L which substantially corresponds to the machine direction. A band transverse direction Q essentially denotes the extent of the band 10 in the transverse machine direction, ie orthogonal to the machine direction or band longitudinal direction L. A thickness direction D denotes a direction substantially orthogonal to the band longitudinal direction L and band transverse direction Q, in which also the thickness of the band Bandes 10 can be measured.

An outer side of the band 10 provided or used in an endless configuration serves for receiving or transporting the web material to be produced and is generally also referred to as the web material contact side B. The inner side of the belt 10 provided in an endless configuration is also generally referred to as the machine contact side M and comes into contact with various belt 10 leading, deflecting or driving rollers of a machine for producing web material.

The configuration of the band 10 or the weave structure thereof will be explained below with reference to FIGS. 3 to 10 with reference to various exemplary embodiments.

3 shows a belt 10 with a web body 20 provided in a woven structure. It is constructed with first yarns 30, 32, 36 extending essentially in a belt longitudinal direction L and provided for example by warp threads. These are interwoven with in the belt transverse direction extending second yarns, here provided by the weft yarns 38, 40 arranged in two layers. The weft yarns 38, 40 are in two levels arranged one above the other, whereby here in these two levels a shot ratio of 1: 1 exists. Thus, FIG. 3 shows a fabric structure of the band body 20 with two fabric layers. The first yarns or Kettgame 30, 32, 34, 36 extending in the band longitudinal direction L form on the machine contact side M floats F, which in each case extend over two second yarns, ie weft yarns 40. The arrangement of these floats on the machine contact side M can be seen in FIG. The floats F formed by first yarns of the belt body 20 directly adjacent to one another in the belt transverse direction overlap one another in that the setting of a yarn beginning to floats and a yarn terminating in a float takes place on the same second yarn. In the exemplary embodiment of a weave structure for a band 10 shown in FIGS. 3 and 4, it can be seen that the first yarns 30, 32, 34, 36 used to build up the web body 20 provided with woven structure also serve the floats at the machine contact side M. To provide F. These first yarns 30, 32, 34, 36 are preferably all provided as monofilament yarns. This means that they consist of a single fiber, for example formed by extrusion of a polymer material. As a building material, for example, PES, a mixture of PES and PTFE, PA or other polymer material can be used. The first yarns 30, 32, 34, 36 used to provide the floats F can have different cross sections, such as round, flat or flattened, oval or else with a slightly angular structure. In principle, it is also conceivable not to provide all of these first yarns 30, 32, 34, 36 used for providing the floats F from the same construction material or / and with the same cross-sectional geometry or cross-sectional dimensioning. Again, there may be a variation in the belt body 20.

Through the use of monofilament yarns to provide the fleet gene F on the machine contact side M various advantages are achieved. On the one hand, it has been shown that the use of monofilament fibers leads to a comparatively low abrasion in the region of the drive shaft or drive train. Deflecting rolls passing floats F leads. Such monofilament fibers are also comparatively incompressible, for example, in comparison to bulking fibers or bulked fibers, which reduces the compressibility of the entire band, in particular also on the machine contact side M. The band constructed in this way has a higher permeability, which essentially remains completely intact over the service life of the band 10.

Also in connection with the used building materials or cross-sectional geometries has been shown that a so constructed band, especially when used in a machine for the production of corrugated board, shows an excellent drive interaction with the drive rollers, since the monofilament fibers in the floats in the im Generally elastically deformable surfaces of such rolls can impress and thus not only by frictional engagement, but also by positive engagement torque or a driving force can be transmitted. This makes it possible to set the tension exerted on the belt to make a sufficient driving force transmission interaction with the driving rollers comparatively small, which reduces the stress of the belt and thus contributes to an increase in its service life. At the same time, due to this lower voltage, the energy required to advance the tape is lowered.

FIG. 5 shows an alternative embodiment variant of the band 10. Here, a substantially single-layered weave structure of the band body 20, ie only one layer of second yarns 38, can be seen. Of the first yarns 30, 32, 34, 36 shown in FIG. 5, the yarns or the warp yarns 34, 36 serve to provide the floats F at the machine contact side M. Between two successive floats in the belt longitudinal direction L, these are the first Yarns 34, 36 at Abbindestellen A to the second Yarns 38 tied and form in this way with the second yarns 38, the weave structure of the belt body 20. The Abbindepunkte A of the two flotations F forming and shown in FIG. 5 first yarns 34, 36 are, as well as the floats F These yarns in the tape longitudinal direction, ie also the direction of extension of these first yarns 34, 36 offset from one another, wherein the offset in each case immediately adjacent first yarns here corresponds to a second yarn 38. The first two yarns 30, 32, which are shown in FIG. 5, form floats F 'on the web material contact side B. Between two such floats F ^{1 of} a respective one of these first yarns 30, 32, a crimping point A 'with the second yarns 38 is provided. In this arrangement, therefore, floats F 'are also formed on the web material contact side B, which contribute there to a comparatively planar structure. It can be seen in particular that, for example, wherever a floats F on the machine contact side M exhibiting first yarn 34, 36 forms a Abbindestelle A with a second yarn 38, and a Abbindestelle A 'of a floats F' on the Bahnmaterialkontaktseite having the adjacent first yarn 30 or 32 is formed. Since such mutually corresponding or juxtaposed Abbindestellen A, A 'having yarns 34, 36 and 30, 32 are offset from each other in the transverse direction (in this case orthogonal to the plane), it should be noted that in the context of the present invention, this provision of "Superimposed" Abbindestellen A, A 'also includes a small offset in the tape transverse direction.

Also in this belt 10 of FIG. 5, the first yarns 34, 36 used to provide the floats F on the machine contact side M are formed as monofilament yarns. The yarns 30, 32 serving to provide the floats F 'on the web material contacting side B may also be provided as monofilament yarns. In principle, however, yarns composed of several filaments, ie multifilaments, could also be used here. lament yarn, spun yarns, floss or the like.

6 shows a belt 10 with a belt body 20 which is provided here with second yarns or weft yarns 38, 40, 42 stacked in three layers. First yarns 30, 32, 34, 36 extending in the belt longitudinal direction L are worn in conjunction with these second yarns 38, 40, 42 for constructing the belt body 20 having a weave structure. The first yarns 44, 46 serving for providing the floats F on the machine contact side M are in this embodiment tied off at tie-down points A with second yarns 40 of the machine-contact side M next layer of second yarns. Between two such Abbindestellen A the yarns float 44, 46 via two second yarns, in which case, for example, reference can be made to second yarns that layer of second yarns, with which the Abbindestellen A of the first yarns 44, 46 are formed. Here, too, there results a structure in which the floats F of directly adjacent first yarns 44, 46 are offset relative to each other in the band longitudinal direction L, as well as the crimping points A of these first yarns 44, 46.

It should be noted in this context that in the figures, only a part of the first yarn used to form the entire weave structure is shown. In the totality of first yarns, the pattern recognizable in the figures, for example represented by the offset of floats or tie-off points, can then continue or repeat in the transverse direction of the tape.

7 shows an embodiment variant in which the band body 20 is again constructed with three layers of second yarns 38, 42, 40 provided by weft yarns, for example, with which two first yarns 30, 32 assigned to one another in pairs and mutually in opposite directions are interwoven are. These form alternating ligation sites on second yarns 38, 40 of the web material contact side B or the machine contact side M closest layer of second yarns.

Mutually assigned or lying directly adjacent to each other, the first yarns 34, 36 are provided. Assigned in pairs here means that these two first yarns 34, 36 are also complementary in terms of their course, that is connected to the web body 20 extending in opposite directions. Where, for example, the first yarn 34 forms a float over two second yarns 40, the first yarn 36 forms a bonding point A, which here extends over two second yarns 40. In this case, for example, the arrangement may be such that in the strip transverse direction immediately adjacent each other, the two first yarns 34, 36, which serve to provide the floats F on the machine contact side M lie. This is followed, for example, by the two first yarns 30, 32 in the transverse direction of the strip, which serve for the structural cohesion of the band body 20 or for its construction. This sequence can then be repeated in the strip transverse direction. In principle, however, an alternating sequence of first yarns serving to provide floats F and first yarns serving to produce the belt body 20 could also be provided.

As in the embodiment of FIG. 6, it is therefore provided here to use different first yarns for constructing the band body 20 on the one hand and for providing the floats F on the other hand. This makes it possible to select optimized yarns for each of these two purposes, optimized with regard to their construction material, with regard to their dimensioning or also their geometry. In any case, however, the yarns used for providing the floats F on the machine contact side M are formed as monofilaments, for example with the above-indicated cross-sectional geometries or construction materials.

FIG. 8 shows a design variant which substantially coincides with that of FIGS. 3 and 4. Here, too, form the structure the belt body 20 used first yarns 30, 32, 34, 36 at the machine contact side M the floats F. The belt body 20 is constructed here for example with three layers of second yarns 38, 42, 40, wherein it should be emphasized that, for example the position of second yarns 38 may be incorporated into the belt body 20 by additional first yarns, not shown in this figure, which may be interlaced or set, for example, with the second yarns 42.

FIG. 9 again shows an embodiment of a band 10 in which different first yarns are again used to construct the band body 20 on the one hand and to provide the floats F on the machine contact side M on the other hand. The belt body 20 is constructed with the first yarns 30, 32, 34, 36 which are interwoven with the second yarns 38, 42, 40 arranged in three layers and thus form a belt body 20 provided with three fabric layers. It can be seen further in FIG. 9 that the belt body 20 comprises further first yarns 33, 35, which are located in the region of the belt body 20 which is close to the web material contact side B or the region of the belt body 20 lying close to the machine contact side M, with the second yarns 38 respectively present there respectively 40, but do not change to other layers of second yarns or set with these. At the machine contact side M, further first yarns 44, 46 extend, which form the floats F extending here via three second yarns 40 and therebetween a crimping point A on the second yarns 40 of the machine yarn contacting side M next layer of second yarns. The floats F are offset in the band longitudinal direction to each other, as well as the binding points A.

While the first yarns 30, 32, 34, 36 used to construct the band body 20 may be provided as monofilament yarns, but basically also as multifilament yarns, spun yarns or bulking yarns or the like, those used to provide the floats F at the machine contact side M are used first yarns 44, 46 again formed as monofilament yarns. At the web material contact side B, further first yarns 48, 50 are provided, which provide the floats F 'there and form tie-down points A' between the floats F 'on second yarns 38 of the web material contact side B next layer of second yarns. These first yarns 48, 50 may also be formed as monofilament yarns, but in principle may also be constructed as multifilament yarn, spun yarns, bulking yarns or the like. Fig. 10 illustrates that the pattern provided by the weave structure of the entire first yarns and second yarns is repeated in the tape transverse direction Q.

For example, in the example shown in Figures 9 and 10, the yarns 48, 50 providing the floats F 'on the web material contacting side B may be formed as polyester spun yarns having Nm 12X10 "ends" or warp yarns The first yarns 44, 46 used in the machine contact side may be formed as polyester monofilament yarns with a diameter of 0.6 mm. The first yarns used to construct the belt body 20, which may equally be warp yarns, ie the first yarns 30, 32, 34 , 36 and also 33 and 35 can be constructed as polyester monofilament yarns with a diameter of 0.5 mm The weft yarns, in this example the second yarns 38, 40, 42, can be polyester monofilament yarns with a diameter of 0.6 mm The warp density of the first yarns may be 1000 yarns per meter, and the density of the second yarn may be 1800 yarns per meter Furthermore, advantageously, the arrangement of the floats F or F 'or the respectively formed therefrom between tie points A and A' be such that in each case where a first yarn 44, 46 forms a bonding point A, in the thickness direction about a Abbindestelle A. 'of a first yarn 48, 50 is formed. Thus, in the band transverse direction, they result in depression structures which provide a comparatively regular arrangement. You can also see In accordance with the above-mentioned measures, the first yarns 44, 46 used to provide the floats F have a larger diameter than those yarns of the belt body 20 which can equally set with the second yarns 40 and thus also appear on the machine contact side M. However, since the first yarns 44, 46 used to form the floats F have a larger diameter, they do not cover these first yarns providing floats or project beyond them in the thickness direction D and thus protect them against wear.

It should finally be pointed out that the dimensions or ratios given above can also be used in the other embodiments. It should also be emphasized once again that not all of the first yarns and second yarns used to provide floats or else to provide the sheet body must necessarily be constructed from the same material or with the same cross-sectional geometry.

In the preceding examples, reference was made to a particularly advantageous embodiment, in which the floats F and also F 'extend in the band longitudinal direction L, thus also the machine direction and running direction of the band. This is a variant which is advantageous with regard to smooth running and with regard to the wear properties or the load. In principle, however, it would also be conceivable to provide such flotings extending in the strip transverse direction. It is also conceivable in principle to use the yarns forming the floats as weft yarns and the yarns extending transversely thereto, which in particular also serve to build up the woven structure of the tape body, as warp yarns.

Claims

claims

A belt for a machine for producing web material, in particular corrugated cardboard, comprising a belt body (20) having a weave structure with first yarns (30, 32, 33, 34, 35, 36, 44, 46, 48) extending in a belt longitudinal direction (L) , 50) and in a belt transverse direction extending second yarns (38, 40, 34), wherein at least a portion of the first yarns (30, 32, 33, 34, 35, 36, 44, 46, 48, 50) and / or a portion of the second yarns (38, 40, 42) on a machine contact side (M) of the belt has floats (F) over at least two yarns (40) of the other type in each case,

characterized in that at least a part of the yarns (30, 32, 34, 36, 44, 46) comprising the floats (F) on the machine contact side (M) is formed as monofilament yarns.

Tape according to claim 1,

characterized in that the yarns (34, 36; 44, 46) comprising the floats on the machine contact side are set to yarns of the belt body (20).

A tape according to claim 1 or 2,

characterized in that the yarns (32, 34, 36, 38) of the belt body (20) having the floats (F) on the machine contact side (M).

Tape according to claim 2 or 3,

characterized in that the band body (20) is formed with at least one, preferably a plurality of fabric layers.

Tape according to one of claims 1 to 4,

characterized in that the yarns (30, 32, 34, 36; 44, 46) comprising the floats on the machine contact side alternately have a tying point (A) with at least one yarn (40) of the other type and a float (F) over at least two yarns (40) of the other type.

6. Tape according to one of claims 1 to 5,

characterized in that by directly adjacent yarns

(30, 32, 34, 36, 44, 46) on the machine contact side (M) formed floats (F) in the extension direction of these yarns (30, 32, 34, 36, 44, 46) are offset from each other. 7. Tape according to claim 5 and 6,

characterized in that the tying points (A) of immediately adjacent yarns (30, 32, 34, 36, 44, 46) having floats (F) on the machine contact side (M) in the direction of extension of these yarns (30, 32, 34, 36, 44, 46) are preferably offset from each other by a yarn of the other type.

8. Tape according to claim 5,

characterized in that immediately adjacent, floats (F) on the machine contact side (M) having yarns (34, 36) are paired with each other in such a way that where there

Yarn (34, 36) of one pair has a float (F), the other yarn (36, 34) of the same pair has a lacing point (A) extending over the length of the float (F) of the one yarn (34, 36). 9. Tape according to one of claims 1 to 8,

characterized in that at least a portion of the first yarns (30, 32, 33, 34, 35, 36, 44, 46, 48, 50) and / or at least a portion of the second yarns (38, 40, 42) on a web material contact side (B) floats (F ') over at least two yarns of the other type.

10. Tape according to claim 9, characterized in that floats on the web material contact side having yarns (30, 32, 48, 50) between in the direction of extension of these yarns (30, 32, 48, 50) directly successive floats (F ') and floats (F) on the Machine in tact side (M) having yarns (34, 36, 44, 46) between in the extension direction of these yarns (34, 36, 44, 46) immediately successive floats (F) each Abbindestellen (A, A ") on yarns of the other type, and that at least part of the tying points (Α ') of the floats (F') on the web material contact side (B) have yarns (30, 32, 48, 50) in a thickness direction (D) of the tape (10) in FIG Substantially over a Abbindestelle (A) of the floats (F) on the machine contact side (M) having yarns (34, 36, 44, 46) is positioned.

11. Tape according to one of claims 1 to 10,

characterized in that floats (F) on the machine contact side (M) having yarns and / or floats (F ') on the web material contact side (M) having yarns warp yarns and / or extending in the tape longitudinal direction (L).

12. Machine for the production of web material, in particular corrugated cardboard, comprising at least one band (10) according to one of the preceding claims.