FI68101B - TORKVAEV FOER ANVAENDNING I EN PAPPERSMASKIN OCH FOERFARANDE FOER DESS FRAMSTAELLNING - Google Patents

Abstract

A fluid-permeable, woven dryer fabric (12) for use in a paper making machine or the like having different permeabilities in different sections (18, 19, 20) across its width to control the moisture profile of a web being conveyed through the dryer section of the paper making machine. Additional cross-machine direction yarns (17) of different thicknesses are located in the dryer fabric (12) at selected positions across the dryer fabric in the cross-machine direction. The additional yarns of different thicknesses are introduced into the dryer fabric at selected positions in the cross-machine direction as part of the weaving process for the dryer fabric.

Description

68101

USED IN THE PAPER MACHINE K l! IV A U S U A DOSE AND METHOD FOR ITS MANUFACTURE - TORKVÄV FÖR ANVÄNDNING I ZU ΡΛPPE RSMASK I N OCH FÖR-FARANDE FÖR DESS FRAMSTÄLLNIMG

The present invention relates to a drying fabric for use in a paper machine, comprising yarns in the direction of the machine and yarns transverse to the direction of the machine, which are woven into a multilayer fabric. The invention further relates to a method for producing such a fabric.

A standard paper machine has three primary blocks: a wire section, a press section and a drying section. In the wire section, the wet mass is deposited on a wire formed by a liquid-permeable endless belt.

A vacuum is used under the wire to remove moisture from the pulp, causing the pulp to form a web on the wire. From the wire section, the web is transferred to the punch section and passed by means of a press felt through a set of press rollers to further remove water from the dough. From the spray section, the web is then transferred to a drying section where it is transported around a heated set of drying cylinders. One or more drying wires are used to press the wet web evenly and sequentially against dry worm cylinders to dry the web. As used herein and in the claims, the term "paper machine" is to be understood in a broad and general sense as a machine that produces paper or paper-like material, such as pulp, board, asbestos, or other similar products.

In the drying section, the drying cylinders are heated internally with steam or the like. Cylinders usually have flat surfaces that are in contact with the paper web. Other rolls, such as folding rolls, may have surfaces that are perforated or provided with slots to allow hot air to pass through them so that drying of the web is enhanced.

There are several problems with the drying section. First, it has been found that the surface temperature of the drying cylinders can vary from axial to machine cross-section by as much as 22 ° C. Thus, it is possible that some parts of the web dry more strongly than other parts of the web due to the uneven transverse moisture distribution of the web.

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Another problem is that moisture from the paper tends to accumulate in closed areas or "pockets" in the dryer section. Usually more moisture accumulates in the center portions of the pockets than in those portions closer to the side edges of the dryer section. ventilate more easily under the influence of ambient air.

Thus, due to temperature differences in the transverse direction of the machine or the drying cylinders and the moisture accumulated in the pockets in the drying section, the web generally has a higher moisture content in its central region than at its edges. This is undesirable The end proves in terms of quality control. Numerous attempts have been made by those skilled in the art to alleviate this problem. First, drying fabrics have been invented which are liquid permeable, with the fabrics having an open tissue. A typical open woven drying fabric is disclosed in U.S. Patent 2,180,054. If a fabric such as knitted fabrics and perforated plastic belts is also used, various types of air jets have been made to further alleviate the problem. devices to remove moisture from drying pockets. Such laws, teas are usually extremely complex and difficult to maintain, especially in new parts that are able to handle loans that are 1 i 7 e y d e 1 r. in the order of 10 m.

Yet another way to provide a more uniform moisture profile in the direction of the frame is disclosed in U.S. Patent 3,867,776.

According to this reference, a liquid-permeable drying wire is made, the permeability of which varies at different points in its width direction. This is done in several ways. First sove 1! according to the embodiment, the drying direction Iran r e u n a - a 1 u e e 11 a are parallel to the machine. The yarns are closer together than in the center of the drying wire. It should be noted that the term "machine direction" as used herein and in the claims refers to the direction of travel of the image or fabric with the wire mounted on the drying section of the paper machine. The term "transverse direction of the machine" refers to the direction transverse to the drying wire or fabric; a straight dry pulp with respect to the direction of travel of the drying wire in the drying section of the paper machine.

In another embodiment, U.S. Patent 3,867,766 alternatively discloses varying the diameter of the machine direction yarns so that those yarns in the region where the permeability is desired to have a larger diameter than those machine direction yarns located in the more permeable portions of the drying wire. As a third embodiment, this reference discloses the use of machine direction yarns having a greater thickness near the side edges of the drying wire. These yarns tend to flatten and close the effective open area between adjacent yarns, thus reducing the permeability of the drying wire near its edges. Yet another application is that the drying wire is selectively treated with larger amounts of resin at its edges or the like than at its center to reduce the permeability of its edges.

The procedures disclosed in said U.S. Patent 3,867,766, despite their effectiveness, have certain disadvantages. For example, as the density of machine direction yarns is increased at the edges of the drying wire, the edges tend to resist stretching to a greater extent and operate at a higher tension than the center of the drying wire. Besides, when the yarns in the machine direction stretch and lose their corrugation, the transverse yarns seen in the machine direction must receive the corrugation. However, yarns transverse to the machine direction are more difficult to bend because their ability to receive corrugation depends on the distance between the yarns in the machine direction. As a result, it has been found that in the drying wire disclosed in U.S. Patent 3,867,766, the machine direction physical properties vary in the width direction of the drying wire. These differences in machine-oriented physical properties present problems in achieving uniform uniformity over the entire width of the drying wire and also make it difficult for the wire to run smoothly and wrinkle-free in the drying section of the paper machine. In addition, the general perception is that a higher operating stress in the drying wire promotes drying of the web. Therefore, drying wires with a higher frequency of machine direction yarns in the edge portions to reduce permeability and thus reduce the drying speed of the wire edge portions suffer from some of the effects of increased drying of the web at the wire edges due to higher stresses on the edges.

The use of one or more resin layers in the drying wire to vary its permeability across the width has not proven to be a particularly effective solution due to the difficulty in keeping the resin coating on the wire throughout its life. This is even more difficult to achieve with wires made of monofilament yarns due to the difficulty in getting the resin end to adhere to them.

The present invention is based on the finding that if in the woven drying wire or fabric, additional cross-machine yarns, which may be of different thickness or specific volume, are located at selected locations in the transverse direction of the fabric, the permeability of the drying fabric may be varied in different zones. The transverse sides of the machine have little or no effect on the machine load-bearing properties of the drying fabric. Thus, there are no significant differences in machine direction physical properties between the zones of the drying fabric in fabrics with different permeabilities. In addition, the present invention can be practiced in the manufacture of drying fabrics made from substantially monofilament yarns. The drying fabrics of this invention can also be sewn with a needle.

The drying fabric according to the invention is thus characterized in that the drying fabric has additional yarns transverse to the machine direction, the length of which is less than the width of the fabric and which are arranged in the width direction of the fabric so as to form different longitudinal zones of fluid.

One well-known problem that often occurs in the drying section of a paper machine is edge vibration in the web. This problem is more serious at the edges of the web and tends to limit the speed at which the drying section of the paper machine can be used. The drying fabrics or fabrics of this invention provide much better control of the edge vibration in the web and therefore allow the drying section to be operated at higher speeds.

Another problem well known in the art is the deformation at the edges of the web, known as "granular edges" or "wrinkled edges", due to the greater drying of the web at the edges and vibration. The drying fabric of the present invention eliminates, or at least reduces, such deformations at the edges of the web.

Woven drying fabrics or wires are used in the drying section of a paper machine as endless belts. The drying fabrics can be woven directly into endless belts by the endless weaving technique well known in the art. In such a case, the weft or filler yarns run in the machine direction and 1o i m i1 a n g a t run in the transverse direction of the machine. Alternatively, the drying fabrics may be flat weave ends combined in a well known manner to form a continuous belt. When the drying wires are t a s a k d o 11 u j a, the warp yarns run in the machine direction and the weft or filler yarns run in the transverse direction of the machine. Since the drying fabrics of the present invention can be woven by either technique, the drying fabric shown by way of example is described herein in the form of a flat woven felt.

According to the invention, a woven drying wire or fabric is prepared for use in a paper machine or the like, in which the fabric has different permeabilities in different zones to control the humidity profile of the web to be passed through the drying section of the paper machine. In order to achieve different permeabilities, additional yarns in the transverse direction of the machine, which may be of different thickness or characteristics, are placed in different zones of the drying fabric.

According to one embodiment of the invention, the drying fabric has threads transverse to the machine direction. which op s 1j o it e 11u into the fabric so as to extend a certain distance from the other edge of the fabric towards its center so that the fabric still has slits 1i transverse to the machine direction which are positioned in the fabric so as to pass opposite the fabric. 6 68101 a certain distance from its edge towards its center, and that the additional yarns are of equal length on each side of the fabric, the fabric comprising two edge zones and a central zone therebetween, the central zone of which is more permeable to fluid than the edge zone.

In another embodiment of the invention, the weft yarns are guided to the edge zones of the drying fabric as in the above-mentioned embodiment. Additional weft yarns with a smaller diameter or lower specificity are passed to the center of the drying fabric and run in the cross-machine direction between the weft yarns of the opposite edge zones. The drying fabric obtained as a result of this second embodiment differs from the above embodiment in that the central part of the drying fabric has a slightly reduced permeability, although the central part has an ever higher permeability than the edge portions of the drying fabric.

The invention can be further applied in that the drying fabric has additional yarns transverse to the machine direction, positioned in the fabric so as to start at one edge of the fabric and run towards its center, some of which are longer than others, the fabric still having additional yarns transverse to the machine direction. , placed in the fabric so as to begin at the opposite edge of the fabric and towards the center thereof, some of which are very long than others, and that the longer yarns mentioned on each side of the fabric are of equal length and the other, shorter yarns so age equal to each other, wherein the fabric comprises two edge zones, two intermediate zones inside the edge zones, and a central zone between the intermediate zones, of which the central zone has the highest permeability, the lower zones have the lowest permeability, and the marginal zones have the lowest permeability.

It is possible to deviate from the above embodiment by omitting weft yarns having a smaller diameter or specific volume. Thus, again, five-zone drying patterns are obtained, with the highest permeability in the middle portion.

In all embodiments of the present invention, the width of the different permeable zones of the drying fabric 7 68101 is not limited. The various zones may be of any suitable width depending on the basic conditions of use of the drying fabric, the material to be dried, the axial temperature variation of the drying fabric, and the like. Likewise, there are no restrictions on the quality of the yarns from which the drying fabric is woven. Threaded yarns, single-stranded yarns, multi-stranded yarns, and combinations thereof can be used.

The method for producing a drying fabric according to the invention, in which the fabric is formed by weaving machine direction yarns and machine direction transverse yarns into a multilayer fabric, is characterized in that the drying fabric is further provided with machine direction yarns that longitudinal zones of tissue are formed in the tissue that permeate the fluid in different ways.

The invention will now be described in more detail by way of example with reference to the accompanying drawings, in which

Fig. 1 is a half-schematic representation of a typical drying section of a paper machine.

Fig. 2 is a partial side plan view of a first embodiment of a drying fabric or fabric according to the invention.

Fig. 3 is a partial semi-schematic cross-sectional view taken along line 3-3 of Fig. 2.

Fig. 4 is a partial sectional semi-schematic cross-sectional view taken along line 4-4 of Fig. 2.

Fig. 5 is a partial semi-schematic plan view of another embodiment of a drying fabric or wire according to the invention.

68101

Fig. 6 is a partial semi-schematic cross-sectional view taken along line 6-6 of Fig. 5.

Fig. 7 is a partial semi-schematic plan view of a third embodiment of a drying fabric or wire according to the invention.

Fig. 8 is a partial semi-schematic cross-sectional view taken along line 8-8 of Fig. 7.

Fig. 9 is a partial semi-schematic plan view of a fourth embodiment of a drying fabric or wire according to the invention.

Fig. 10 is a partial semi-schematic cross-sectional view taken along line 10-10 of Fig. 9.

Reference is first made to Figure 1, which shows a typical drying section of a paper machine. The drying section consists of an upper series of drying cylinders 1, 2 and 3 and a lower series of drying cylinders 4 and 5. The drying cylinders 1-5 are heated in a suitable manner, such as steam or the like. As discussed above, other rollers, such as rollers 9 and 11, may have flat surfaces or routed surfaces to allow heated air to pass through them and the web to be dried.

In Fig. 1, the web to be dried is denoted by the number 6. The web has an upper surface 6a and a lower surface 6b. The web is guided into and out of the drying section by guide rollers 7. As described above, the web 6 may be any material normally made in a paper machine or paper machine-like machines, including paper, pulp, board, asbestos or the like. It should be noted from Figure 1 that the web passes through the drying section in a tortuous path, touching each of the upper and lower drying cylinders in order. It should further be noted that the upper surface 6a of the web 6 contacts the lower series of cylinders 4 and 5 and the lower surface 6b of the web contacts the upper series of cylinders 1, 2 and 3.

68101 9

The drying section shown in Figure 1 is of the type using two drying wires. The first drying wire 8 is shown passing over the parts of the upper series formed by the cylinders 1, 2 and 3. The drying wire is suitably guided and tensioned by additional folding rollers 9. The purpose of the drying wire 8 is to support the web 6 as it passes over the cylinders 1, 2 and 3 and to bring the underside 6b of the web into close contact with the cylinders 1, 2 and 3.

The drying wire 10 passes over parts of the lower series formed by cylinders 4 and 5 and is suitably tensioned and guided by folding rollers 11. Again the lower drying wire 10 is intended to press the web 6 against the drying rollers 4 and 5 and bring the web upper surface 6a into close contact with the drying cylinders 4 and 5. . The drying wires 8 and 10 are substantially similar in length, and the invention is applicable to either the upper or lower drying wire.

A first embodiment of the invention is illustrated in Figures 2, 3 and 4, in which like parts are given like reference numerals. Reference is first made to Figures 2 and 3. The drying fabrics of the invention are woven from yarns, and the yarns may be twisted yarns, single yarns, multifilament yarns, or combinations thereof. As mentioned above, the drying fabrics of the invention are described herein in plan view.

The invention requires that a multilayer fabric be used in the woven fabrics. In this case, the embodiment of Figures 2, 3 and 4, generally designated 12, is shown schematically in a simple manner of a simple double fabric. supply i machine direction yarns are shown at number 13. K od e - or full rolls (machine direction yarns) are arranged;. »·· 'in two layers. The upper filler yarns are denoted by the number 14 and the lower filler yarns by the number 15. Since the yarns 14 and 15 are arranged vertically in pairs, only the yarns 14 are shown in Fig. 2. Both layers of the filler yarn are shown in Figs.

From the half-schematic representation of the simple double fabric according to Fig. 3, it is obvious that the filling 1 between the vertical pairs of ducks 14 and 15 has a series of diamond-shaped openings. These diamond-shaped openings are shown at 16.

In the embodiment of Figures 2-4, the weft yarns are arranged in diamond-shaped openings 16. The weft yarns are denoted by the number 17 in Figure 4. As shown more clearly in Figure 2, the weft yarns 17 extend from the longitudinal edges of the drying wire 12 to a predetermined distance to the center of the drying wire. It is immediately apparent from Figure 2 that the drying wire 12 has three blocks or zones. The edge blocks 18 and 19 comprise weft yarns 17. The central block or zone 20 is free of weft yarns. Due to the weft yarns 17 in blocks 18 and 19, these blocks have lower permeability than the middle block 20.

It will be apparent to those skilled in the art that the width of blocks 18, 19 and 20 does not place limitations on this invention. During the weaving process, the blocks 18, 19 and 20 are dimensioned to any desired width so that the drying wire 12 can have a cross-machine direction permeability profile appropriate to its intended use. The width of the blocks 18, 19 and 20 depends on a number of factors, such as the quality of the web 6 material, the desired moisture profile for the dried web, the axial temperature variation of the drying cylinders 1-5 in the cross machine direction, the yarns from which the drying wire is made, the drying wire and the web 6. width, etc.

Figures 5 and 6 show another embodiment of the present invention. In this embodiment, the drying wire is generally designated 12a. The drying wire 12a is substantially similar to the drying wire 12 shown in Figs. 2-4, and similar parts are given the same reference numerals. The drying wire 12a has warp or machine direction yarns 13, weft or filler yarns 14 and 15 in the transverse direction of the machine, and weft yarns 17 extending inwardly from both longitudinal sides of the drying wire. As a result, the drying wire 12a is again divided into two edge zones 18a, and 19a and a center zone 20a. The only difference between the drying wire 12a shown in Figures 5 and 6 and the drying wire 12 shown in Figures 2-4 11 681 01 is that the additional weft yarns are located in the central block or zone 20a. Each of the additional weft yarns 21 runs the full width of the central block 20a and is generally aligned with opposite edge weft yarns 17 in the same diamond-shaped opening 16.

Figure 4 is to be understood as a longitudinal cross-sectional view of both blocks or zones 18a or 19a shown in Figure 5. Fig. 6 is a longitudinal cross-sectional view of the central zone 20a shown in Fig. 5. It is immediately apparent that the weft webs 21 are selected to have a smaller size or smaller specific volume than the weft web 17a. As a result, the drying wire 12a differs from the drying wire 12 in that the central zone or central block 20a has a slightly lower permeability than the center of Figure 2. 11a 20, while having an increasing permeability than the edge blocks 18a and 19a. Again, the width of the blocks 18a, 19a and 20a can be varied, as shown in connection with the embodiment shown in Figures 2-4.

A third embodiment of the present invention, generally designated 12b, is shown in Figures 7 and 8. Typically, by way of example, the drying wire 12b is shown woven with a simple double fabric. The warp or machine direction yarns are again shown at 13 and the weft or filler yarns running in the transverse direction of the machine are again shown at 14.

As in the previous embodiments, the filler yarns are arranged on the edge portions of the drying wire 12b. The filler yarns, which are similar to the previous embodiments, are shown at 17. The drying wire 12b differs from the previous embodiments in that the alternating edge filler yarns are longer and extend inwardly from the edge of the drying wire toward the center. These filler yarns are denoted by the number 17a.

The drying wire 12b is also provided with filler yarns of smaller diameter or specific volume which pass between the edge filler yarns. These intermediate filling yarns running between the edge filling yarns 17 are similar to those shown in Fig. 5 and are again given the reference number 21. These intermediate filling yarns 1, which run along the filling 1 between the holes 17a, are of course shorter and are marked with reference number 21a.

Due to this structure, it is clear from Fig. 7a that the drying wire 12b is divided into five zones or blocks in its width direction (i.e., in the cross-sectional area of the machine). First are the outermost blocks: 22 and 23. These edge blocks are similar to the edge blocks 18 and 19 shown in Figure 2 and the edge blocks 18a and 19a shown in Figure 5. Therefore, the cross-sectional view, Fig. 4, can be considered to be a longitudinal cross-section of the blocks 22 and 23 shown in Fig. 7, differing only in that the alternating wires shown in Fig. 4 are indicated by reference numeral 17a. The outermost blocks or zones would have the lowest permeability.

The middle block 24 of the drying wire 12b is substantially similar to the central block 20a shown in Figure 5, except that it is considerably narrower. The cross-sectional view, Fig. 6, can be considered as a cross-section of the central block of Fig. 7, except that the alternating filler yarns shown in Fig. 6 would be denoted by 21a. This is the block of the drying wire 12b with the highest permeability.

Finally, the drying wire 12b has two intermediate zones or intermediate blocks 25 and 26. In these zones, the filler yarns 17a and 21 are alternating. The longitudinal cross-section of block 25 is shown in Figure 8. It is to be understood that Figure 8 is also a longitudinal cross-section of block 26. Thus, these blocks 25 and 26 have alternating large diameter filler yarns and filler yarns having a smaller diameter or a smaller cm volume and providing a permeability between the permeabilities of the block 24 on the one hand and the blocks 22 and 23 on the other. As a result, the drying wire 12b has a high permeability center block 24, a medium permeability intermediate block 25 and 26, and a low permeability edge block 22 and 23.

Figures 9 and 10 show a fourth embodiment of the present invention, in which the drying wire is generally designated 12c. The drying wire 12c is similar to the drying wire 12b shown in Figs. 7 and 8, with the only exception that the filler yarns 21 and 21a having a smaller diameter or a smaller specific volume are omitted. In Figures 9 and 10, similar parts are given the same reference numerals as in Figures 7 and 8.

Again, the drying wire 12c has five zones or blocks. Thus, the wire 12c has edge zones 22 and 23 similar to the edge zones 22 and 23 of the wire 12b shown in Fig. 7. The wire 12c has a central zone 24a having the same width as the zone 24 shown in Fig. 7 but with filler yarns 21 and 21a having a smaller diameter. or a smaller specific capacity is omitted. Similarly, the intermediate zones? 5a and 26a of the drying wire 12c differ from the intermediate zones 25 and 26 of the wire 12b only in that the yarns 21 having a smaller diameter or a smaller specific volume are omitted.

As a result of these differences, the drying wire 12c has the same permeability at its edges as the drying wire 12b. The central zone 24a of the drying wire 12c has the highest permeability and therefore a higher permeability than the central zone 24 of the drying wire 12b. Fig. 10 is a schematic cross-sectional view illustrating a longitudinal section of the zone 25a of the drying wire 12c. It is to be understood that Fig. 10 may also be understood as a longitudinal section of the intermediate zone 26a shown in Fig. 9. Because yarns 21 with a smaller diameter or smaller specific volume are omitted in blocks 25a and 26a, these blocks have lower permeability than the central block 24a but greater permeability than the weft blocks 25 and 26 of the wire 12b.

The embodiments described above are only an example of the way in which the present invention can be used to provide drying fabrics with zones of different permeability in the width direction (i.e., in the transverse direction of the machine, a: The same i1 a when all muccos are described with a drying fabric made of a simple double , it is to be understood that any suitable multilayer fabric may be used to which filler yarns may be added, and by varying the quality of the filler yarns and their location, a wide variety of drying fabrics having different permeabilities in their width direction may be obtained.

Since, according to the invention, the frequency of the warp or machine direction yarns is equal and does not vary in the width direction of the wire, there have been no significant changes in the width direction, load-bearing properties of the drying wire 1. It is recommended that the filler yarns are not harder or stiffer and stiffer than the base yarns.

In the drying fabrics disclosed in the aforementioned U.S. Patent 3,867,766, it has been found that the load-bearing or elongation properties of the edge blocks and the center block can differ from each other by as much as 1: 3.5. The drying fabrics of this invention have much more uniform load-bearing or elongation properties in their various zones.

Example 1

A drying wire of the type shown in Fig. 5 was made utilizing a simple double fabric. The warp or machine direction yarns 13 were 20 mils of single strand synthetic yarn at a frequency of 52 yarns / 2.5 cm. Both polyester and nylon yarns were used arranged in alternating groups of four yarns over the entire width of the drying wire.

The filler or cross-machine yarns 14 and 15 were 20 mil single core polyester yarns. The outer filler yarns 17 were 0.7 number cotton yarns spun from polyester yarns. The middle filling yarns 21 were 4/4 number cotton yarns spun from polyester staple fibers. The total yarn density was 41 yarns / 2.5 cm including the fill yarns.

The drying wire was about 690 cm wide with the outer zones 18a and 19a being about 100 cm wide and the center zone 20a being about 490 cm wide. The drying wire is heated in a conventional manner to make the wire heat resistant and to achieve the final desired dimensions.

The permeabilities of blocks 18a, 19a, and 20a were tested using a standard Frazier air permeability tester that provides permeability values in cubic feet / minute / square foot of wire with a pressure drop of 0.5 inches of water. The permeability of the blocks or zones 18a and 19a was about 90 cubic feet per minute while the permeability of the central block 20 was about 180 cubic feet per minute.

The standard elongation test was on samples taken from blocks 18a, 19a and 20a with an elongation of 0.65% in the machine direction. Under these conditions, the edge blocks 18a and 19a showed a force of 1.7 kg per cm width, while the middle blocks 20a showed a force of 1.3 kg per cm width. Thus, the ratio of the load-bearing properties between the edge blocks 18a and 19a and the center block 20a was 1: 1.3. Thus, it can be seen that the wire blocks had almost similar load-bearing properties.

E s i ^ merkk i_2

A second drying wire of the type shown in Fig. 9 was made utilizing a simple double fabric. The warp or machine direction yarns 13 were 3,250 denier continuous multifilament polyester yarns arranged at a density of 32 yarns / 2.5 cm in the edge blocks 22 and 23, 30 yarns / 2.5 cm in their intermediate blocks 25a and 26a, and 24 yarns / 2.5 cm in the middle block 24a. In the permeability test described in connection with Example 1, the edge regions 22 and 23 had a permeability of 100 cubic feet per minute, the intermediate blocks 25a and 26a had a permeability of 275 cubic feet per minute, and the center block 24a had a permeability of 400 cubic feet per minute.

The drying wire shown in this example was about 710 cm wide, with the edge blocks 22 and 23 being about 11 G cm, the silicon blocks 25a and 26a being about 97 cm, and the center block 24a being 295 cm. The drying wire was treated with a resin to improve the stability of the wire, and the wire was heat-treated in a conventional manner to render the wire heat-resistant and to obtain the final desired dimensions on the wire.

Samples from five blocks 22, 23, 25a, 26a and 24a were subjected to a standard elongation test as described in Example 1 above. By 1.3% elongation in the machine direction, the edge blocks 22 and 23 showed a force of 1.56 kg per cm width. The intermediate blocks 25a and 26a showed a force of 1.36 kg per cm width and the middle block 24a showed a force of 1.4 kg per cm width. It should again be noted that the load resistance characteristics in the machine direction were very much more uniform than in the prior art, with a maximum to minimum ratio of 1: 1.5.

Variations can be made to the invention without departing from its inventive idea.

Claims (9)

1. Drying fabric for use in a paper mask in which fabric (12) consists of trees (13) lying in the machine direction and of extending trees (14,15) which are woven into a fabric consisting of several layer, characterized in that in the drying fabric (12) there are also in addition to the machine direction transverse extra threads (17), the length of which is less than the width of the fabric and which are placed along the width of the fabric, so that it extends zones (18). 20, 22-26) in the longitudinal direction of the fabric, which are permeable to liquid in various ways. Drying fabric according to Claim 1, characterized in that in the drying fabric (12, 12a) there are transverse strands (17) which are arranged in the machine direction, which are positioned in the fabric so that they extend from one end of the fabric a certain distance towards its middle, that in the weave there are further extending strands (17) in the machine direction, which are placed in the weave, that they like from the opposite edge of the weave a certain distance towards its middle, and that the extra trees are equally long on the web. both sides of the fabric, the fabric comprising two edge zones (18-19, 18a-19a) and a central zone (20,20a) located between them, of which the middle zone is better permeable to liquid than the edge zone. Drying fabric according to claim 1, characterized in that in the drying fabric (12b, 12c) there are transverse trees (17,17a) placed in the machine direction which are placed in the fabric so that they start from one end of the fabric and like to its middle, and some of which (17a) are longer than others (17), and that the approximate longer trees (17a) on both sides of the web are mutually equal and the other shorter trees (17) are equally long , wherein the web comprises two edge zones (22-23), two intermediate zones (25-26, 25a-26a) located on the inner side of the edge zones, and a middle zone (24,24a) located between the intermediate zones, of which the middle zone has the largest, intermediate zone. - the lance zones a smaller, and the edge zones the least permeable. 68101 Drying fabric according to claim 2, characterized in that in the drying fabric (12a) there are transverse trees (21) which are transverse to the machine direction, which run between the said extra threads (17) at the edges of the fabric. Drying fabric according to claim 3, characterized in that, in the drying fabric (12b), there are transverse strands (21a) which are transverse to the machine direction, which run between the said extra strands (17a) at the edges of the fabric. Drying fabric according to claim 1, characterized in that in the drying fabric (12), there are in the relative direction of the machine direction, extra trees (17), which start from one end of the fabric and enter towards its center without exceeding it, and that the in the weave, in addition to the machine direction, there are transverse extra trees (17), which start from the opposite edge of the weave and go towards its center without exceeding it. A method of making a drying fabric (12) according to claim 1, wherein the fabric is formed by weaving trees (13) lying in the machine direction and in relation to the machine direction transverse trees (14,15) to a fabric consisting of several layer, characterized in that the drying fabric (12) is additionally provided with transversely extending trees (17) relative to the machine direction, the length of which is less than the width of the fabric and which are placed along the width of the fabric, so that it strikes zones (18-20, 22). 26) in the longitudinal direction of the fabric, which are permeable to liquid in various ways. Method according to claim 7, characterized in that the drying fabric (12, 12a) is provided with transverse trees (17), which are positioned in relation to the machine direction, which are placed in the fabric so that they extend from one end of the fabric a certain distance towards its center. , that the fabric is further provided in the relative tili