JP2024034396A - Papermaking belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a papermaking belt in which warpage of ends during use is suppressed.

SOLUTION: A papermaking belt is used in a paper machine and has a first surface on which a wet paper is disposed and a second surface on the opposite side of the first surface. The papermaking belt has a reinforcement fiber substrate layer including at least one layer of woven fabric. At least one layer of the woven fabric has a double- or more layered texture. The layered texture has first yarns and second yarns disposed in parallel. The first yarns are disposed nearer to the first surface than the second yarns. The second yarns are disposed nearer to the second surface than the first yarns. The second yarn includes polyester yarn.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a papermaking belt.

Paper machines that remove moisture from paper raw materials generally include a wire part, a press part, and a dryer part. These wire part, press part, and dryer part are arranged in this order along the conveyance direction of the wet paper web.

In each part of such a paper machine, various papermaking belts are used for the purpose of conveying wet paper, compressing wet paper, and the like. Examples of such papermaking belts include wet paper web conveyance belts (transfer belts) for conveying and delivering wet paper webs, shoe press belts used in shoe press mechanisms, and the like.

Regarding the delivery of wet paper web using a wet paper web conveying belt in a press part, closed-draw paper machines that deliver wet paper web by closed draw are currently known as paper machines. In the press part of a closed-draw paper machine, the wet paper is conveyed while being placed on papermaking felt or a wet paper conveyor belt, so there is no place where the wet paper runs alone, which prevents the occurrence of paper breaks. has been done. Therefore, closed draw paper machines are superior in terms of suitability for high-speed operation and operational stability.

Patent Document 1 discloses a method having two layers made of a resin material, with one layer disposed on the side of the CD support layer, for the purpose of preventing warping of the ends caused by different shrinkage characteristics of different materials, finishing processes, etc. However, a papermaking belt has been proposed in which the other layer is placed on the front side.

International Publication No. 03/071030 specification

By the way, when using a papermaking belt, in order to prevent the papermaking belt from meandering, it is sometimes used together with an automatic guide device, a so-called guider. A guider generally detects the widthwise end of a running papermaking belt and adjusts the running position of the papermaking belt. Here, if the end portion of the papermaking belt is warped, the guider cannot detect the accurate position of the papermaking belt, and cannot appropriately adjust the running position of the papermaking belt. As a result, it becomes difficult to use the papermaking belt stably.

Additionally, papermaking belts are generally used in the presence of water, ie, in a wet state. Therefore, it is necessary to consider the occurrence of warpage at the end of the papermaking belt in a wet state. The papermaking belt described in Patent Document 1 is merely intended to prevent warpage of the ends of the papermaking belt as a finished product, and does not take into account warpage of the ends in a wet state.

Therefore, an object of the present invention is to provide a papermaking belt in which warping of the ends during use is suppressed.

As a result of intensive studies to achieve the above object, the inventor of the present invention found that the base fabric layer constituting the papermaking belt has a relatively large effect on the warp of the end of the papermaking belt during use. I found it. Furthermore, we discovered that by using a woven fabric with a layered structure as the base fabric layer and carefully selecting the material for the threads in the layered structure, it was possible to suppress the warping of the ends of papermaking belts, and we proceeded with further studies. As a result, the present invention was achieved.

The gist of the invention is as follows.
[1] A papermaking belt used in a papermaking machine and having a first surface on which wet paper is placed and a second surface opposite to the first surface,
having a reinforcing fiber base layer including at least one layer of woven fabric;
At least one layer of the woven fabric has a double or more layered structure,
The layered structure has first threads and second threads arranged in parallel,
the first thread is arranged on a first surface more than the second thread, the second thread is arranged on a second face more than the first thread,
The papermaking belt, wherein the second yarn includes a polyester yarn.
[2] The papermaking belt according to [1], wherein the second thread is crimped.
[3] The papermaking belt according to [1] or [2], wherein the second yarn is a multifilament twisted yarn.
[4] The papermaking belt according to any one of [1] to [3], wherein the first thread and the second thread are arranged along the machine direction of the papermaking belt.
[5] The papermaking belt according to any one of [1] to [4], which does not have a batt layer.
[6] The papermaking belt according to any one of [1] to [5], wherein the fineness of the first yarn is larger than the fineness of the second yarn.
[7] The woven fabric further includes a third thread woven into the first thread and the second thread,
The papermaking belt according to any one of [1] to [6], wherein the third thread is a twisted monofilament thread.
[8] The woven fabric having the layered structure further includes a third thread woven into the first thread and the second thread,
The layered structure includes a repetition in which the third thread passes through the first surface side of the K number of the first threads and passes through the second surface side of the L number of the first threads. , it is possible to simultaneously form repetitions in which the third thread passes through the first surface side of the M number of the second threads and passes through the second surface side of the N number of the second threads. It is a tissue with repeating units,
The papermaking belt according to any one of [1] to [7], which satisfies the relationship K/L≧N/M.
[9] The woven fabric having the layered structure further includes a third thread woven into the first thread and the second thread,
The number of intersection points of the first thread and the third thread in the complete tissue is larger than the number of intersection points of the second thread and the third thread in the complete structure, [1] to [8] ] The papermaking belt according to any one of the above.
[10] The papermaking belt according to any one of [1] to [9], which is a wet paper web conveying belt.
[11] The papermaking belt according to any one of [1] to [9], which is a shoe press belt.

With the above configuration, it is possible to provide a papermaking belt in which warping of the end portion during use is suppressed.

FIG. 1 is a machine cross-sectional view showing an example of a papermaking belt according to a preferred embodiment of the present invention. FIG. 2 is an enlarged sectional view of a reinforcing fiber base material included in a papermaking belt according to a preferred embodiment of the present invention. FIG. 3 is a complete organizational diagram of the woven fabric of the reinforcing fiber base material of the papermaking belt according to the preferred embodiment of the present invention. FIG. 4 is a complete organizational diagram of a woven fabric of reinforcing fiber base material with a papermaking belt according to a preferred embodiment of the present invention. FIG. 7 is an enlarged cross-sectional view of a reinforcing fiber base material included in a papermaking belt according to a modification of the present invention. It is a complete structure diagram of the woven fabric of the reinforcing fiber base material which the papermaking belt based on the modification of this invention has. It is a complete structure diagram of the woven fabric of the reinforcing fiber base material which the papermaking belt based on the modification of this invention has. FIG. 8 is a machine cross-sectional view of a papermaking belt according to another modification of the present invention. FIG. 9 is a schematic diagram for explaining a preferred embodiment of the method for manufacturing a papermaking belt according to the present invention. FIG. 10 is a schematic diagram for explaining a preferred embodiment of the method for manufacturing a papermaking belt according to the present invention. FIG. 11 is a schematic diagram for explaining another preferred embodiment of the method for manufacturing a papermaking belt according to the present invention. FIG. 12 is a schematic diagram for explaining another preferred embodiment of the method for manufacturing a papermaking belt according to the present invention. FIG. 13 is a schematic diagram for explaining a method for evaluating the warpage of the end portion of the wet paper web conveying belt used in the example. FIG. 14 is a schematic diagram for explaining a method for evaluating warpage at the end of the wet paper web conveying belt used in the examples. FIG. 15 is a schematic diagram showing an example of a papermaking belt and an automatic guide device mounted on a papermaking machine. FIG. 16 is a schematic diagram illustrating the relationship between the warpage at the end of the papermaking belt and the detection unit (palm) of the automatic guide device.

Hereinafter, preferred embodiments of the papermaking belt according to the present invention will be described in detail with reference to the drawings.

<1. Relationship between papermaking belt and automatic guide device>
First, prior to explaining the papermaking belt according to the present invention, the relationship between the papermaking belt and the automatic guide device will be explained.
Fig. 15 is a schematic diagram showing an example of a papermaking belt and an automatic guide device installed in a paper machine, and Fig. 16 shows the relationship between warping at the end of the papermaking belt and the detection part (palm) of the automatic guide device. It is a schematic diagram for explaining.

A papermaking belt 101 shown in FIG. 15 is an endless belt that runs via rolls. The automatic guide device 110 is a device that adjusts the running position of the papermaking belt 101 so that the running position of the papermaking belt 101 does not shift toward the drive side or the non-drive side of the paper machine during operation. The automatic guide device 110 constantly detects the position of the papermaking belt 101 and changes the angle of the guide roll 102 with respect to the running direction of the papermaking belt 101 so that the papermaking belt 101 is at an appropriate position. The traveling position of the belt 101 is being adjusted.

To control the angle of the guide roll 102, an end of an actuator 106 such as an air spring is connected to a bearing on one side of the guide roll 102, and a coil spring 107 is installed to balance the actuator 106 and the coil spring 107. is commonly used. By applying air pressure to the actuator 106, the bearing 108 on one side moves using the bearing 109 on the other end as a fulcrum. The position of the guide roll 102 (angle with respect to the running direction of the papermaking belt 101) is determined so that the force of the actuator 106 pushing the bearing 108 and the reaction force of the coil spring 107 are balanced.

Further, as a device that detects the position of the papermaking belt 101 and supplies air pressure corresponding to the position to the actuator 106 of the guide roll 102, an air pressure adjustment device 104 with a palm-type position detector is often used. A constant air pressure (supply pressure) is supplied to the air pressure adjusting device 104 through a pressure reducing valve 105, while the palm 103 is brought into contact with the end of the running papermaking belt 101. Then, a change in the position of the end 1011 of the papermaking belt 101 is detected as a displacement of the palm 103 in contact with the palm 103, and a part or all of the supplied air is released into the atmosphere inside the air pressure adjustment device 104 due to the displacement of the palm 103. The residual pressure is taken as the output pressure of the air pressure regulator 104. By supplying air at this output pressure to the actuator 106, the position of the guide roll 102 can be adjusted.

Here, the relationship between the palm 103 and the end portion 1011 of the papermaking belt 101 will be considered. As shown in FIG. 16, when the papermaking belt 101 is not warped (papermaking belt 101'), the end 1011' of the papermaking belt 101' contacts the palm 103 at an appropriate position, The automatic guide device 110 can accurately detect the position of the papermaking belt 101'. On the other hand, when the end 1011 of the papermaking belt 101 is warped, the end 1011 is warped, and as a result, the end 1011 exists at a distance D from the position where it should be detected, and the palm 103 is located at the end. Problems may arise, such as not being able to make contact with the end portion 1011, coming into contact with the end portion 1011 at a position away from the position where the palm 103 should originally make contact, and coming into contact with a portion of the automatic guide device 110 other than the palm 103.

When the papermaking belt 101 is warped in this manner, the automatic guide device 110 cannot accurately detect the position of the papermaking belt 101, making it difficult to stably use the papermaking belt 101. In addition, in the above explanation, problems that may occur due to warping of papermaking belts were explained using a palm-type automatic guide device that uses a palm as an example of the automatic guide device, but other mechanical automatic guide devices or optical A similar problem may occur in an automatic guide device because the end of the papermaking belt is detected and the position of the papermaking belt is adjusted.
In view of these circumstances, the inventors of the present invention have developed a papermaking belt in which warping of the end portions during use is suppressed as described below.

<2. Wet paper transport belt (papermaking belt)>
Next, a papermaking belt according to a preferred embodiment of the present invention will be described.
FIG. 1 is a machine cross-sectional view showing an example of a wet paper web conveyance belt (papermaking belt) according to a preferred embodiment of the present invention, and FIG. 2 is a reinforcing fiber base material included in the wet paper web conveyance belt shown in FIG. 3 and 4 are complete organization diagrams of the woven fabric of the reinforcing fiber base material included in the wet paper web conveying belt shown in FIG. 1. In the drawings, the size of each member is appropriately emphasized for ease of explanation, and the actual ratio and size of each member are not shown. Here, the above-mentioned Cross Machine Direction is also referred to as "CMD", and the Machine Direction is also referred to as "MD". Further, in this embodiment, a wet paper web conveying belt will be described as an example of a papermaking belt, but the papermaking belt of the present invention is not limited to this.

A wet paper web transport belt (papermaking belt) 1 shown in FIG. 1 is used for transporting and delivering wet paper web W in a press part of a paper machine. The wet paper web conveying belt 1 is an endless belt-shaped body. That is, the wet paper web conveyance belt 1 is an annular belt. The wet paper web conveying belt 1 is normally arranged such that its circumferential direction is along the machine direction (MD) of the paper making system.

The wet paper web conveying belt 1 includes a reinforcing fiber base layer 11 and a first resin layer (wet paper A support side resin layer) 13 and a second resin layer (roll side resin layer) 15 provided on the other main surface (second surface 151) on the inner surface side of the reinforcing fiber base material layer 11. However, these layers are stacked. Furthermore, the first resin layer 13 is a layer that forms the outer surface (outer peripheral surface) of the ring formed by the wet paper web conveying belt 1 .

The reinforcing fiber base material layer 11 is composed of a reinforcing fiber base material 111 and a resin 113. The resin 113 is present in the reinforcing fiber base material layer 11 as a matrix resin so as to fill the gaps between the fibers in the reinforcing fiber base material 111. That is, a portion of the resin 113 is impregnated into the reinforcing fiber base material 111, while the reinforcing fiber base material 111 is embedded in the resin 113.

The reinforcing fiber base material 111 is a woven fabric having a double structure in this embodiment, and includes a first warp 115, a second warp 117, and a weft 119. In the double structure of the reinforcing fiber base material 111, the first warp 115 is arranged on the first surface 131 side (wet paper web carrying side), and the second warp 117 is arranged on the opposite side to the first surface 131. side, that is, the second surface 151 side (roll side). Further, the first warp 115 and the second warp 117 are arranged in parallel. Further, the first warp threads 115 and the second warp threads 117 are arranged along the direction perpendicular to the plane of the paper, that is, the machine direction (MD) in FIGS. 1 and 2. On the other hand, the weft threads 119 are arranged substantially perpendicular to the first warp threads 115 and the second warp threads 117, ie along the cross machine direction (CMD). The weft threads 119 are interwoven with the first warp threads 115 and the second warp threads 117.
Note that in FIGS. 1 and 2, a part of the structure of the reinforcing fiber base material 111 is schematically illustrated for easy understanding.

In this specification, the term "warp" refers to yarns arranged along the machine direction (MD), that is, the circumferential direction, of a wet paper web conveyance belt (papermaking belt), and the term "weft" refers to yarns arranged along the machine direction (MD), that is, the circumferential direction of a wet paper web conveyance belt It is a thread that is arranged along the cross machine direction (CMD) of the belt (papermaking belt), that is, a direction perpendicular to the circumferential direction and parallel to the first surface of the papermaking belt. In other words, the warp direction is set based on the machine direction of the papermaking belt and paper machine, that is, the wet paper web conveyance direction, and the weft direction is perpendicular to the machine cross direction of the papermaking belt and paper machine, that is, the wet paper web conveyance direction. The direction is set as a reference. Further, the warp yarns do not need to be parallel to the machine direction (MD) of the papermaking belt, and may be arranged, for example, at an angle within ±10° with respect to the machine direction (MD) of the papermaking belt. Furthermore, the weft yarns do not have to be parallel to the cross-machine direction (CMD) of the paper-making belt; for example, they may be arranged at an angle within ±10° with respect to the cross-machine direction (CMD) of the paper-making belt. good.

In this embodiment, the second warp threads 117 include polyester threads. As a result, warping of the ends of the wet paper web conveyance belt 1 during use, that is, the ends in the width direction (CMD) is suppressed.

To explain in more detail, the warping of the edge of the wet paper web conveying belt during use is caused not only by the initial warping that exists in the finished product immediately after its manufacture, but also by the warping caused by wetting with water during use and during the paper machine. The inventors have discovered that there is a warpage caused by mechanical action. Furthermore, the present inventor has focused on the possibility that the warpage caused by swelling of the wet paper web conveying belt with water or the like during use may have the greatest effect on the warpage of the end portion of the papermaking belt during use.

The present inventor has a woven fabric in which the reinforcing fiber base material has a layered structure, and furthermore, of the two parallel threads in the woven fabric, the second yarn on the side opposite to the wet paper web carrying side, that is, on the roll side. It has been found that by including the polyester yarn in the yarn, it is possible to control the warpage at the end of the wet paper web conveying belt. Specifically, first, when a papermaking belt is used, it is in the presence of a large amount of water. Polyester thread is a material that is relatively difficult to absorb water. For this reason, in a reinforcing fiber base material equipped with a woven fabric having such second threads, the second threads on the roll side do not absorb water and do not swell when a papermaking belt is used, so that the end portions of the second threads do not absorb water and do not swell. Curving toward the wet paper web carrying side is suppressed. As a result of the above, warping of the end portion of the wet paper web conveying belt during use, especially warping toward the wet paper web carrying side, is prevented. In this embodiment, the first warp 115 is used as the first thread, and the second warp 117 is used as the second thread.

As described above, in this embodiment, the second warp threads 117 include polyester threads. A polyester thread is a thread that contains at least a polyester resin. Polyester resin has low water absorption, and swelling due to water absorption is suppressed under the usage environment of papermaking belts such as the wet paper web conveying belt 1, where a large amount of water is used. Therefore, the second warp yarns 117 are prevented from swelling due to water absorption even when the wet paper web conveyance belt 1 is used, and deformation of the reinforcing fiber base layer 11 and, by extension, the wet paper web conveyance belt 1 is suppressed.

The polyester resin constituting the polyester yarn included in the second warp 117 is not particularly limited, but examples thereof include polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, etc. One of these may be used alone or two or more may be used in combination.

Among the above, the polyester resin preferably contains one or more selected from the group consisting of polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, and more preferably polyethylene terephthalate, polytrimethylene terephthalate. , and polybutylene terephthalate. As a result, even when the wet paper web conveyance belt 1 is used, swelling due to water absorption is suppressed, and deformation of the reinforcing fiber base material layer 11 and, by extension, the wet paper web conveyance belt 1 is suppressed.

Furthermore, the polyester yarn included in the second warp 117 may contain resin other than polyester resin. Such resins are not particularly limited, and include, for example, aliphatic polyamides (polyamide 6, polyamide 66, polyamide 11, polyamide 12, polyamide 610, polyamide 612, etc.), aromatic polyamide (aramid), polyvinylidene fluoride, polypropylene , polyetheretherketone, polytetrafluoroethylene, and polyethylene.

In such a case, the polyester yarn included in the second warp 117 may be a yarn made of a mixture of polyester resin and a resin other than polyester resin, or a yarn made of a mixture of polyester resin fibers and a resin other than polyester resin. It may also be a yarn mixed with resin fibers. However, in such a case, the content of the polyester resin contained in the polyester yarn included in the second warp 117 is preferably 50% by mass or more, more preferably 65% by mass or more. In particular, the polyester threads included in the second warp threads 117 are more preferably made essentially of polyester resin, particularly preferably made of polyester resin.

In addition, there are a plurality of second warp threads 117 in the reinforcing fiber base material layer 11, but all of them may be polyester threads, or may include threads of resin other than polyester resin in addition to polyester threads. You can stay there. The thread made of resin other than polyester resin is not particularly limited, and includes, for example, aliphatic polyamide (polyamide 6, polyamide 66, polyamide 11, polyamide 12, polyamide 610, polyamide 612, etc.), aromatic polyamide (aramid), polyvinylidene fluoride, It is composed of one or more resins such as polypropylene, polyetheretherketone, polytetrafluoroethylene, and polyethylene.

Moreover, in this case, preferably 50% or more, more preferably 65% or more, and still more preferably 80% or more of the plurality of second warp threads 117 are polyester threads. Preferably all second warp threads are polyester threads. Thereby, the effect of the polyester thread mentioned above can be obtained more reliably.

Further, the materials constituting the first warp 115, the second warp 117, and the weft 119 are not particularly limited, and include polyester (polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), aliphatic Polyamide (polyamide 6, polyamide 66, polyamide 11, polyamide 12, polyamide 610, polyamide 612, etc.), aromatic polyamide (aramid), polyvinylidene fluoride, polypropylene, polyetheretherketone, polytetrafluoroethylene, polyethylene, wool, cotton , metals, etc. can be used alone or in combination of two or more.
Any two or more of the first warp 115, the second warp 117, and the weft 119 may be made of the same material, or may be made of different materials.

Among those mentioned above, the first warp 115 preferably contains one or more selected from the group consisting of polyester, aliphatic polyamide, and aromatic polyamide (aramid), and more preferably polyethylene terephthalate, polytrimethylene terephthalate, and polyester. It contains one or more selected from the group consisting of butylene terephthalate, polyethylene naphthalate, polyamide 6, polyamide 66, polyamide 11, polyamide 12, polyamide 610, and polyamide 612. This makes it possible to maintain both strength and dimensional stability when the wet paper web conveying belt 1 is used.

Among the above, the weft 119 preferably includes one or more selected from the group consisting of polyester, aliphatic polyamide, and aromatic polyamide (aramid), and more preferably polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, It contains one or more selected from the group consisting of polyethylene naphthalate, polyamide 6, polyamide 66, polyamide 11, polyamide 12, polyamide 610, and polyamide 612. This makes it possible to maintain both strength and dimensional stability when the wet paper web conveying belt 1 is used.

Further, the fineness of the first warp yarns 115 is not particularly limited, and is, for example, 500 dtex or more and 8000 dtex or less, preferably 1000 dtex or more and 6000 dtex or less, and more preferably 2000 dtex or more and 4000 dtex or less. Thereby, the stiffness of the reinforcing fiber base material 111 can be made sufficient, and warping of the end portions of the wet paper web conveying belt 1 toward the wet paper web carrying side and the roll side can be more effectively suppressed.

Further, the fineness of the second warp yarns 117 is not particularly limited, but is, for example, 500 dtex or more and 8000 dtex or less, preferably 1000 dtex or more and 6000 dtex or less, and more preferably 2000 dtex or more and 4000 dtex or less. This results in
The strength of the reinforcing fiber base material 111 and thus the strength of the wet paper web conveying belt 1 can be made sufficient, while warping of the end portions of the wet paper web conveying belt 1 can be suppressed more effectively.

Further, the fineness of the first warp 115 is preferably larger than the fineness of the second warp 117. In this way, the fineness of the first warp 115 on the first surface 131 side where the wet paper web W is arranged is made larger than the fineness of the second warp 117 on the opposite second surface 151 side. By doing so, the density on the first surface 131 side (wet paper web carrying side) of the woven fabric increases, and as a result, the rigidity on the first surface 131 side (wet paper paper carrying side) increases. As a result, the end portion of the reinforcing fiber base material layer including the woven fabric is further prevented from warping toward the first surface 131 side (wet paper web carrying side).

Specifically, the fineness of the first warp yarns 115 can be greater than the fineness of the second warp yarns 117 by 50 dtex or more, preferably by 100 dtex or more, and more preferably by 200 dtex or more. Thereby, it is possible to more effectively suppress warping of the end portion of the wet paper web conveying belt 1 during use. Further, the fineness of the first warp yarns 115 can be greater than the fineness of the second warp yarns 117 by, for example, 3000 dtex or less, preferably 2500 dtex or less, and more preferably 1000 dtex or less. This can prevent the fineness of the first warp yarns 115 from becoming excessively large compared to the fineness of the second warp yarns 117, thereby preventing the ends of the wet paper web conveying belt 1 from warping toward the roll side. .

Further, the fineness of the weft yarn 119 is not particularly limited, but is, for example, 500 dtex or more and 6000 dtex or less, preferably 800 dtex or more and 3000 dtex or less, and more preferably 1000 dtex or more and 2000 dtex or less. Thereby, the strength of the reinforcing fiber base material 111 and thus the strength of the wet paper web conveying belt 1 can be made sufficient, and the waviness caused by weaving of the reinforcing fiber base material 111 can be sufficiently suppressed.

Further, the first warp 115, the second warp 117, and the weft 119 may be yarns of any type, and may be spun yarns (spun yarns) or filament yarns. However, from the viewpoint of ensuring the strength of the reinforcing fiber base material 111 and, by extension, the wet paper web conveying belt 1, it is preferable that the first warp 115, the second warp 117, and the weft 119 are all filament yarns. Note that the first warp 115, the second warp 117, and the weft 119 may have different forms, or may have the same form.

Furthermore, examples of the filament yarn include multifilament or monofilament twisted yarn, multifilament or monofilament aligned yarn, and monofilament single yarn.

Here, in this specification, a "multifilament" is a filament that includes two or more single filaments. Usually, the single yarns constituting the multifilament have such a fineness that they cannot be used alone as yarns for the reinforcing fiber base material. Specifically, the fineness of the single yarn constituting the multifilament is, for example, less than 100 dtex, preferably 5 dtex or more and 50 dtex or less. Moreover, a monofilament is a filament consisting of one filament. Usually, the single yarn constituting the monofilament has a fineness that allows it to be used alone as the yarn of the reinforcing fiber base material. The fineness of the monofilament is, for example, 100 dtex or more and 6000 dtex or less, preferably 200 dtex or more and 2500 dtex or less.

Moreover, "multifilament twisted yarn" refers to twisted yarn using multifilament as the raw yarn. Moreover, "aligned multifilament yarn" refers to a yarn in which a plurality of single yarns constituting the above-mentioned multifilament are aligned as a raw yarn.

When used as a multifilament or monofilament aligned yarn, the aligned yarn can be obtained by aligning the raw yarns so that the obtained filament yarn has, for example, a desired fineness. In this case, the fineness of the single yarn constituting the raw yarn of the multifilament is preferably 5 dtex or more and less than 100 dtex, more preferably 5 dtex or more and 50 dtex or less. Further, the fineness of the monofilament yarn is preferably 100 dtex or more and 1000 dtex or less, more preferably 100 dtex or more and 500 dtex or less.

When using multifilament or monofilament twisted yarn, twisted yarn or single twisted yarn can be used. In the case of twisting, a plurality of raw yarns are aligned so as to have, for example, 200 dtex or more and 2500 dtex or less, preferably 300 dtex or more and 2000 dtex or less, and the aligned raw yarns are twisted. In this case, a plurality of yarns, for example 2 to 10 yarns, are aligned and further twisted to obtain a multifilament or monofilament twisted yarn so that the twisted and uniform raw yarn has the desired fineness. The number of twists in the first twist is not particularly limited, but is, for example, 0.05 times/cm or more and 20.0 times/cm or less, preferably 0.1 times/cm or more and 10.0 times/cm or less. Further, the number of twists of the ply is not particularly limited, but is, for example, 0.05 times/cm or more and 20.0 times/cm or less, preferably 0.1 times/cm or more and 10.0 times/cm or less.

In the case of single twist, a plurality of yarns are aligned so as to have the desired fineness, and the aligned yarns are twisted to obtain multifilament or monofilament twisted yarn. It can be twisted yarn. In this case, the number is not particularly limited, but is, for example, 0.05 times/cm or more and 20.0 times/cm or less, preferably 0.1 times/cm or more and 10.0 times/cm or less.

When using twisted yarn, the fineness of the single yarn constituting the raw yarn of the multifilament is preferably 5 dtex or more and less than 100 dtex, more preferably 5 dtex or more and 50 dtex or less. Further, the fineness of the monofilament yarn is preferably 200 dtex or more and 1500 dtex or less, more preferably 300 dtex or more and 1000 dtex or less.

Further, the first warp 115, the second warp 117, and the weft 119 may be processed as appropriate. Examples of such processing include stretching processing and crimp processing.

Among those described above, the first warp yarns 115 preferably include monofilaments, more preferably monofilament twists, and still more preferably monofilament twists.

Among those mentioned above, the second warp yarns 117 preferably include multifilaments, more preferably multifilament twists, and still more preferably twists of multifilament pieces. When the second warp yarns 117 are twisted yarns made of multifilament pieces, the impregnation speed of the resin material from the second surface 151 side can be reduced during manufacturing of the wet paper web conveying belt 1, and the batt layer It is possible to form the second resin layer 15 with sufficient thickness without forming the second resin layer 15. As a result, it becomes possible to omit the batt layer, and warping of the end portions of the wet paper web conveying belt 1 is further suppressed.

Further, the second warp threads 117 are preferably crimped. Thereby, when manufacturing the wet paper web conveying belt 1, the impregnation speed of the resin material from the second surface 151 side can be reduced, and the second resin layer 15 with a sufficient thickness can be formed. .

Among those mentioned above, the weft yarn 119 preferably includes a monofilament, more preferably a monofilament twist, and even more preferably a monofilament twist. Thereby, it is possible to more effectively suppress warping of the end portion of the wet paper web conveying belt 1 during use.

Further, as described above, the reinforcing fiber base material 111 is a woven fabric having a double structure in which the first warp 115 and the second warp 117 are warps, and the weft 119 is a weft. The structure of the reinforcing fiber base material 111 will be explained below with reference to FIGS. 2 to 4.

As shown in FIG. 2 and as described above, in the double structure of the reinforcing fiber base material 111, the first warp 115 is arranged on the first surface 131 side (wet paper web carrying side), and the second warp 117 is arranged on the opposite side to the first surface side, that is, on the second surface 151 side (roll side). The weft yarns 119 are then woven into the first warp yarns 115 and the second warp yarns 117 to form the fabric structure of the reinforcing fiber base material 111.

Specifically, regarding the relationship between the first warp 115 and the weft 119, the weft 119 passes through the first surface 131 side of one first warp 115 (1, 5, 9 in FIG. 2). , 13, 17), then pass through the second surface 151 side of the three first warps 115 (2-4, 6-8, 10-12, 14-16, 18-20 in FIG. 2) It has repetition. Furthermore, regarding the relationship between the second warp 117 and the weft 119, the weft 119 passes through the first surface 131 side of the seven second warps 117 (4 to 10, 12 to 18 in FIG. 2). , and then passes through the second surface 151 side of one second warp 117 (3, 11, 19 in FIG. 2) repeatedly. Then, the reinforcing fiber base material 111 is formed so that the repeating relationship between the first warp threads 115 and the weft threads 119 and the repeating relation between the second warp threads 117 and the weft threads 119 can be formed simultaneously. The stacked structure has repeating units R.

In addition, in the following explanation, the weft passes through the first surface side of K first warps and then passes through the second surface side of L first warps, and the weft passes through M warps repeatedly. "L/K /M" is also written. Therefore, the textile structure shown in FIG. 2 can be expressed as a "3/1 1/7" double structure.

Preferably, K, L, M, and N described above satisfy the relationship K/L≧N/M. As a result, the density of the woven fabric of the reinforcing fiber base material 111 on the wet paper web carrying side (first surface 131) increases, and as a result, the rigidity of the wet paper paper carrying side increases. Therefore, the reinforcing fiber base material 111 is more effectively prevented from warping at its end toward the wet paper web carrying side, and more effectively prevents the end of the wet paper web conveying belt 1 from warping and warping toward the wet paper web carrying side during use. is suppressed. More preferably, K, L, M, and N satisfy the relationship K/L>N/M.

FIG. 3 is a complete organization diagram showing the relationship between the first warp 115 and weft 119 of the reinforcing fiber base material 111. This complete organization diagram can be obtained by observing which of the first warp yarns 115 and weft yarns 119 are exposed on the first surface 131 side when the reinforcing fiber base material 111 is viewed from the first surface 131 side. Can be done. In FIG. 3, in the black portion, the first warp 115 is exposed on the first surface 131 side, and in the white portion, the weft yarn 119 is exposed on the first surface 131 side. In other words, in the white portion, the weft yarn 119 intersects with the first warp yarn 115 and turns back to form an intersecting point (knuckle portion). In this embodiment, the number of crossing points between the weft 119 and the first warp 115 in the complete design is 16.

FIG. 4 is a complete organization diagram showing the relationship between the second warp 117 and weft 119 of the reinforcing fiber base material 111. This complete organization chart can be obtained by observing which of the second warp yarns 117 and weft yarns 119 are exposed on the second surface 151 side when the reinforcing fiber base material 111 is viewed from the second surface 151 side. Can be done. In FIG. 4, in the black portion, the second warp 117 is exposed on the second surface 151 side, and in the white portion, the weft yarn 119 is exposed on the second surface 151 side. In other words, in the white portion, the weft yarn 119 intersects with the second warp yarn 117 and is folded back to form an intersecting point (knuckle portion). In this embodiment, the number of crossing points between the weft 119 and the second warp 117 in the complete design is eight.

Thus, in the present embodiment, the number of intersection points between the weft 119 and the first warp 115 in the complete design is greater than the number of intersection points between the weft 119 and the second warp 117 in the complete design. As a result, the density of the woven fabric of the reinforcing fiber base material 111 on the wet paper web carrying side (first surface 131) increases, and as a result, the rigidity of the wet paper paper carrying side increases. Therefore, the reinforcing fiber base material 111 is more effectively prevented from warping at its end toward the wet paper web carrying side, and more effectively prevents the end of the wet paper web conveying belt 1 from warping and warping toward the wet paper web carrying side during use. is suppressed.

Note that the reinforcing fiber base material 111 includes, in addition to the above-mentioned specific woven fabric, other woven fabrics and/or other fibrous materials such as a lattice-like material in which warp rows and weft rows are overlapped without weaving. It's okay to stay. Further, the reinforcing fiber base material 111 may include threads arranged in a spiral along the circumferential direction.
Further, the fineness of the fibers constituting the reinforcing fiber base material 111 may differ depending on the region where the fibers are used.

The material of the resin 133 included in the reinforcing fiber base layer 11 is not particularly limited, and may include thermosetting resins such as urethane resin, epoxy resin, and acrylic resin, or thermoplastic resins such as polyamide resin, polyarylate resin, and polyester resin. One type of resin or the like can be used alone or two or more types can be used in combination, and urethane resin can be preferably used.

The urethane resin used for the resin 133 is not particularly limited, but for example, a urethane prepolymer having an isocyanate group at the end obtained by reacting a polyisocyanate compound and a polyol, and curing it with a curing agent having an active hydrogen group. It can be made into a urethane resin obtained by Further, anionic, nonionic, cationic self-emulsifying or forced emulsifying water-based urethane resins can be used.

As mentioned above, urethane resin is produced by curing a urethane prepolymer having isocyanate groups at the terminals obtained by reacting a water-based urethane resin and/or a polyisocyanate compound with a polyol together with a curing agent having active hydrogen groups. Contains the urethane resin obtained. Note that any urethane resin is formed using a polyisocyanate compound, a polyol, and, if necessary, a curing agent. Therefore, the polyisocyanate compound, polyol, and curing agent that constitute the urethane resin will be explained below.

Examples of the polyisocyanate compound include aromatic polyisocyanate compounds and aliphatic polyisocyanate compounds, and one type of these compounds can be used alone or two or more types can be used in combination. Examples of aromatic polyisocyanate compounds include 2,4-tolylene diisocyanate (2,4-TDI), 2,6-tolylene diisocyanate (2,6-TDI), and 4,4'-methylenebis(phenylisocyanate). (MDI), p-phenylene diisocyanate (PPDI), dimethylbiphenylene diisocyanate (TODI), naphthalene-1,5-diisocyanate (NDI), 4,4-dibenzyl diisocyanate (DBDI), xylylene diisocyanate (XDI), tetra Examples include methylxylylene diisocyanate (TMXDI), polymethylene polyphenyl polyisocyanate (polymeric MDI), and the like.

Examples of the aliphatic polyisocyanate compound include, but are not limited to, chain aliphatic polyisocyanates such as 1,6-hexamethylene diisocyanate (HDI) and 1,5-pentamethylene diisocyanate, and 1-isocyanate-3-isocyanate. Methyl-3,5,5-trimethylcyclohexane (IPDI), dicyclohexylmethane-4,4'-diisocyanate (H12MDI), 1,3-cyclohexyl diisocyanate, 1,4-cyclohexyl diisocyanate (CHDI) and 1,4-bis- (Isocyanate methyl) cyclohexane (H6XDI) and other alicyclic polyisocyanates are mentioned, and one type of these can be used alone or two or more types can be used in combination.

Among the above-mentioned polyisocyanate compounds, preferably one or more selected from the group consisting of aromatic polyisocyanate compounds and aliphatic polyisocyanate compounds, more preferably 2,4-tolylene-diisocyanate (2,4- TDI), 2,6-tolylene diisocyanate (2,6-TDI), 4,4'-methylenebis(phenylisocyanate) (MDI), 1-isocyanate-3-isocyanatomethyl-3,5,5-trimethylcyclohexane ( IPDI), and dicyclohexylmethane-4,4'-diisocyanate (H12MDI). Thereby, the crack resistance, abrasion resistance, and wet paper web transportability (balance between adhesion and peelability between the wet paper web W and the wet paper web transport belt 1) of the wet paper web transport belt 1 can be improved.

The polyol compound is not particularly limited, and long-chain polyol compounds such as polycaprolactone polyol, polyester polyols such as polyethylene adipate, polyethylene glycol, polyoxypropylene glycol, polyhexamethylene ether glycol, and polytetramethylene ether glycol (PTMG) can be used. polyether polyols such as polyether polyols, polycarbonate polyols such as polycarbonate diols, silicone polyols such as polyether carbonate diols, polybutadiene polyols, perfluoropolyether polyols, and silicone diols, and one of these may be used alone or Two or more types can be used in combination.

Note that the polycarbonate polyol is not particularly limited, but includes, for example, a polycarbonate polyol synthesized from a polycarbonate polyol raw material polyol and a polycarbonate source. In addition, the polycarbonate polyol raw material polyol is not particularly limited, but examples thereof include linear or branched alkylene glycols having 2 to 20 carbon atoms, hydroxyl group-containing cyclic hydrocarbons having 2 to 20 carbon atoms, and the like. One of these may be used alone or two or more may be used in combination. Examples of the linear alkylene glycol include ethylene glycol, propanediol, butanediol, pentanediol, hexanediol, heptanediol, octanediol, nonanediol, decanediol, undecanediol, dodecanediol, and the like. Examples of the branched alkylene glycol include 2-methyl-1,3-propanediol, 2,2-dimethyl-1,3-propanediol, 3-methyl-1,5-pentanediol, 2-methyl-1, Examples include 8-octanediol. Examples of the hydroxyl group-containing cyclic hydrocarbon include hydroxyl group-containing alicyclic alkanes such as 1,3-cyclohexanediol, 1,4-cyclohexanediol, and 1,4-cyclohexanedimethanol.

Among the above-mentioned polyol compounds, preferably one or more selected from the group consisting of polyether polyol, polycarbonate polyol, and polyether carbonate diol, more preferably polytetramethylene ether glycol (PTMG) and hexanediol. and a polycarbonate polyol synthesized from a polycarbonate source. Thereby, the crack resistance, abrasion resistance, and wet paper web transportability (balance between adhesion and peelability between the wet paper web W and the wet paper web transport belt 1) of the wet paper web transport belt 1 can be improved.

The curing agent having an active hydrogen group is not particularly limited, and one or more compounds selected from the group consisting of polyol compounds and polyamines can be used.

As polyol compounds that can be included in the curing agent, in addition to the long-chain polyol compounds mentioned above, various aliphatic polyol compounds and various alicyclic or aromatic polyol compounds can be used.

The aliphatic polyol compound is not particularly limited and includes, for example, ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, 1,2-propanediol, 1,3-propanediol, dipropylene glycol, tripropylene glycol, 1 , 2-butanediol, 1,3-butanediol, 1,4-butanediol, 2,3-butanediol, 1,5-pentanediol, 1,5-hexanediol, 1,6-hexanediol, 2, 5-hexanediol, 1,7-heptanediol, 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, 1,11-undecanediol, 1,12-dodecanediol, 1,13 -tridecanediol, 1,14-tetradecanediol, 1,16-hexadecanediol, 1,18-octadecanediol, 1,20-icosanediol, 2-methyl-1,3-propanediol, neopentyl glycol, 2 -Alkylene glycols such as butyl-2-ethyl-1,3-propanediol, 3-methyl-1,5-pentanediol, 2-ethyl-1,3-hexanediol, 2-methyl-1,8-octanediol, etc. Examples include compounds such as glycerin, ditrimethylolpropane, trimethylolpropane (TMP), pentaerythritol, and dihydroxymethylpropionic acid (DHPA).

The alicyclic polyol compound is not particularly limited, and examples thereof include 1,4-cyclohexanedimethanol, hydrogenated bisphenol A, and the like.
The aromatic polyol compound is not particularly limited and includes, for example, hydroquinone bis-β-hydroxyethyl ether (HQEE), hydroxyphenyl ether resorcinol (HER), 1,3-bis(2-hydroxyethoxybenzene), 1,4 -bis(2-hydroxyethoxybenzene), bisphenol A, alkylene oxide adducts of bisphenol A, bisphenol S, alkylene oxide adducts of bisphenol S, and the like.

Examples of polyamines include, but are not limited to, hydrazine, ethylenediamine, 4,4'-methylene-bis-(2-chloroaniline) (MOCA), dimethylthiotoluenediamine (DMTDA), diethyltoluenediamine (DETDA), and trimethylene glycol. Di(p-aminobenzoate) (TMAB), 4,4'-methylene-bis-(3-chloro-2,6-diethylaniline) (MCDEA), 4,4'-methylene-bis-(2,6- diethylaniline) (MDEA), triisopropanolamine (TIPA), p-bis(aminocyclohexyl)methane (PACM), naphthalene-1,5-diamine, xylylenediamine, phenylenediamine, toluene-2,4-diamine, t -butyltoluenediamine, 1,2-bis(2-aminophenylthioethane), 2-(2-aminoethylamino)ethanol and the like.

Among the above, the curing agent preferably contains one or more selected from the group consisting of aliphatic polyol compounds and polyamines, more preferably ethylene glycol, butanediol, trimethylolpropane (TMP), and dimethylthiotoluenediamine. (DMTDA) and diethyltoluenediamine (DETDA). As a result, the crack resistance, abrasion resistance, and wet paper web transportability (balance between adhesion and peelability between the wet paper web W and the wet paper web transport belt 1) of the wet paper web transport belt 1 can be improved.

Further, the resin 113 of the reinforcing fiber base material layer 11 may be crosslinked with a crosslinking agent. Examples of the crosslinking agent include various crosslinking agents such as carbodiimide type, melamine type, epoxy type, and isocyanate type, and these can be used alone or in combination of two or more types. Further, the crosslinking agent may be a crosslinking agent composition containing a solvent, a dispersant, a surfactant, etc., or may be a liquid (eg, a solution, a dispersion, an emulsion). Further, when the crosslinking agent is in the form of a solution, the crosslinking agent may be an aqueous solution.

The above-mentioned crosslinking agent may be used in combination with materials for forming the urethane resin, such as a urethane prepolymer and a curing agent, or may be used in combination with a water-based urethane resin dispersion.

Further, the resin 133 may contain one type or a combination of two or more types of inorganic fillers such as titanium oxide, kaolin, clay, talc, diatomaceous earth, calcium carbonate, calcium silicate, magnesium silicate, silica, and mica. Good too.

Note that the composition and type of the resin 113 in the reinforcing fiber base layer 11 may be different for each part in the reinforcing fiber base layer 11, or may be the same.

The first resin layer 13 is a layer provided on one main surface of the reinforcing fiber base layer 11 and mainly made of resin.
The first resin layer 13 constitutes a first surface 131 on which the wet paper web W is placed, on the main surface opposite to the main surface joined to the reinforcing fiber base layer 11 . That is, the wet paper web conveying belt 1 can carry the wet paper web W while supporting the wet paper web W on the first surface 131 of the first resin layer 13 . Note that in the illustrated embodiment, the wet paper web W is placed directly on the first surface 131. However, the wet paper web W may be indirectly placed on the first surface 131. For example, depending on the manner of use, another device such as felt may be placed between the first surface 131 and the wet paper paper W, and the wet paper paper W may be placed on the first surface 131 via the other device. You may.

The material of the resin constituting the first resin layer 13 is not particularly limited, and for example, various resins that can be used for the resin 113 of the reinforcing fiber base layer 11 described above may be used alone or in combination of two or more. Can be used. The resin constituting the first resin layer 13 may be the same as or different from the resin 113 of the reinforcing fiber base layer 11 in terms of type and composition.

In addition, one or two inorganic fillers such as titanium oxide, kaolin, clay, talc, diatomaceous earth, calcium carbonate, calcium silicate, magnesium silicate, silica, and mica are added to the resin constituting the first resin layer 13. A combination of more than one species may be included. By including such an inorganic filler in the resin constituting the first resin layer 13, the unevenness, surface roughness, hydrophilicity, etc. of the first surface 131 of the first resin layer 13 can be improved. 1 can more easily control the surface condition of the surface 131 of the wet paper web conveying belt 1, which is capable of conveying the wet paper web W with it attached (wet paper paper adhesion) and transporting the wet paper paper W to the subsequent stage. During delivery, the function of smoothly removing the wet paper web W (wet paper paper releasability) can be more reliably achieved.

On the other hand, when the wet paper web conveyance belt 1 is used, the inorganic filler absorbs moisture less easily compared to other parts of the wet paper web conveyance belt 1, so the end portions of the wet paper web conveyance belt 1 may warp. This is likely to be a contributing factor. However, in this embodiment, since the wet paper web conveyance belt 1 includes the above-mentioned reinforcing fiber base material 111, even when an inorganic filler is used, the warping of the end portion of the wet paper web conveyance belt 1 is sufficiently prevented. suppressed.

Moreover, it is preferable that the first resin layer 13 has a property of not permeating water. That is, the first resin layer 13 is preferably water-impermeable.

The second resin layer (roll-side resin layer) 15 is a layer provided on one main surface of the reinforcing fiber base material layer 11 and mainly made of resin.
The second resin layer 15 constitutes a second surface 151 for contacting a roll, which will be described later, on the main surface opposite to the main surface joined to the reinforcing fiber base material layer 11 . When the wet paper web conveying belt 1 is in use, the second surface 151 comes into contact with the roll, so that power for conveying the wet paper web can be obtained from the roll. Further, the second surface 151 can also be formed with unevenness by arranging the second warp threads 117 on the second surface 151, thereby causing so-called hydroplaning in which the wet paper web conveying belt 1 and the roll slip. The phenomenon can be prevented.

As the resin constituting the second resin layer 15, one or a combination of two or more resin materials that can be used for the first resin layer 13 as described above can be used. The resin constituting the second resin layer 15 may be the same or different in type and composition from the resin constituting the first resin layer 13 or the resin 113 constituting the reinforcing fiber base layer 11. It's okay.

Further, the second resin layer 15 may contain one or more types of inorganic fillers, similar to the first resin layer 13.
Note that the composition and type of the resin material and inorganic filler in the second resin layer 15 may be different for each part in the second resin layer 15, or may be the same.

The dimensions of the wet paper web conveying belt 1 as described above are not particularly limited, and can be appropriately set according to the intended use.
For example, the width of the wet paper web conveying belt 1 is not particularly limited, but can be 700 to 13,500 mm, preferably 2,500 to 12,500 mm.
Further, for example, the length (circumferential length) of the wet paper web conveying belt 1 is not particularly limited, but can be set to 4 to 35 m, preferably 10 to 30 m.

Further, the thickness of the wet paper web conveying belt 1 is not particularly limited, but may be, for example, 1.5 to 7.0 mm, preferably 2.0 to 6.0 mm.
Further, the wet paper web conveying belt 1 may have different thicknesses for each part, or may have the same thickness.

The wet paper web conveyance belt 1 as described above can be manufactured, for example, by a method for manufacturing a wet paper web conveyance belt according to the present embodiment, which will be described later.

As described above, in the wet paper web conveying belt 1 according to the present embodiment, the reinforcing fiber base material 111 includes a woven fabric having a double weave, and the second warp 117 in the woven fabric includes a polyester yarn. As a result, warping of the ends of the wet paper web conveyance belt 1 during use, that is, the ends in the width direction (CMD) is suppressed. As a result, the automatic guide device can detect the position of the wet paper web conveyance belt 1 with higher accuracy and control the position of the wet paper web conveyance belt 1 more appropriately. Such a wet paper web conveying belt 1 can be used stably.

<2. Modified example>
Next, some modified examples of the papermaking belt according to the above-described embodiment will be described. Hereinafter, differences from the embodiments described above will be mainly described, and descriptions of similar matters will be omitted. Further, the modified examples described below and the features of the embodiments described above may be applied individually, but they may be applied in combination of two or more as long as it is technically permissible. Good too.

(2.1. First modification)
FIG. 5 is an enlarged sectional view of a reinforcing fiber base material included in a wet paper web conveyance belt (papermaking belt) according to a first modification, and FIGS. This is a complete organization diagram of the material's woven fabric.

The wet paper web conveying belt 1A according to the first modification has the same structure as described above in that it has a reinforcing fiber base material 111A as shown in FIGS. 5 to 7 instead of the reinforcing fiber base material 111 in the above-described embodiment. Unlike the embodiment, other aspects are basically the same. The reinforcing fiber base material 111A will be explained below.

The reinforcing fiber base material 111A is a woven fabric having a double structure, and includes a first warp 115A, a second warp 117A, and a weft 119A. In the double structure of the reinforcing fiber base material 111A, the first warp 115A is arranged on the first surface side (wet paper web carrying side, not shown), and the second warp 117A is arranged on the first surface side. is arranged on the opposite side, that is, on the second surface side (roll side, not shown). Further, the first warp 115A and the second warp 117A are arranged in parallel. Further, the first warp 115A and the second warp 117A are arranged along the machine direction (MD). On the other hand, the weft threads 119A are arranged substantially perpendicularly to the first warp threads 115A and the second warp threads 117A, that is, along the cross machine direction (CMD). The weft 119A is interwoven with the first warp 115A and the second warp 117A.

Specifically, as for the relationship between the first warp 115A and the weft 119A, the weft 119A passes through the first surface side of one first warp 115A (1, 5, 9, 13, 17), and then pass through the second surface side of the three first warp threads 115A (2 to 4, 6 to 8, 10 to 12, and 14 to 16 in FIG. 5). . Furthermore, regarding the relationship between the second warp 117A and the weft 119A, the weft 119A passes through the first surface side of the three second warp 117A (in FIG. 5, 4 to 6, 8 to 10, 12 14, 16 to 18), and then passes through the second surface side of one first warp 115A (3, 7, 11, 15 in FIG. 5). Then, the reinforcing fiber base material 111A is made so that the repeating relationship between the first warp 115A and the weft 119A and the repeating relationship between the second warp 117A and the weft 119A can be formed simultaneously. The stacked structure has repeating units R'. The fabric structure of the reinforcing fiber base material 111 shown in FIG. 5 described above can be expressed as a "3/1 1/3" double structure.

FIG. 6 is a complete organization chart showing the relationship between the first warp 115A and the weft 119A of the reinforcing fiber base material 111A. In this complete organization chart, it is possible to observe which of the first warp yarns 115A and the weft yarns 119A are exposed to the first surface side when the reinforcing fiber base material 111A is viewed from the first surface side. . In FIG. 6, in the black portion, the first warp 115A is exposed on the first surface side, and in the white portion, the weft yarn 119A is exposed on the first surface side. In other words, in the white portion, the weft 119A intersects with the first warp 115A and is folded back to form an intersecting point (knuckle portion). In this modification, the number of crossing points between the weft 119A and the first warp 115A in the complete design is four.

FIG. 7 is a complete organization diagram showing the relationship between the second warp 117A and the weft 119A of the reinforcing fiber base material 111A. In this complete organization chart, when the reinforcing fiber base material 111A is viewed from the second surface side, it can be observed which of the second warp yarns 117A and the weft yarns 119A are exposed to the second surface side. . In FIG. 7, in the black portion, the second warp 117A is exposed on the second surface side, and in the white portion, the weft yarn 119A is exposed on the second surface side. In other words, in the white portion, the weft 119A intersects with the second warp and turns back to form an intersecting point (knuckle portion). In this modification, the number of crossing points between the weft 119A and the second warp 117A in the complete design is four.

Also in the wet paper web conveying belt 1A as described above, the second warp threads 117A include polyester threads. Thereby, the same effects as in the embodiment described above can be achieved.

(2.2. Second modification)
FIG. 8 is a sectional view in the machine transverse direction of a wet paper web conveying belt (papermaking belt) according to a second modification. The wet paper web conveying belt 1B according to the second modification uses a first resin in which batt fibers are impregnated with a resin material in place of the first resin layer 13 and the second resin layer 15 in the above-described embodiment. This embodiment differs from the embodiment described above in that it includes a layer 13B and a second resin layer 15B in which batt fibers are impregnated with a resin material.

The first resin layer 13B is obtained by impregnating a resin material into a batt fiber layer formed on the reinforcing fiber base layer 11B. Therefore, the first resin layer 13B includes batt fibers and resin as a matrix. As the resin material for the first resin layer 13B, the same material as the resin material for the first resin layer 13 in the embodiment described above can be used. Furthermore, as the material for the batt fibers, materials that can be used for the reinforcing fiber base material 111 in the embodiment described above can be used singly or in combination of two or more.

The second resin layer 15B is obtained by impregnating a resin material into a batt fiber layer formed on the reinforcing fiber base layer 11B. Therefore, the second resin layer 15B includes batt fibers and resin as a matrix. As the resin material of the second resin layer 15B, the same material as the resin material of the first resin layer 13 in the above-described embodiment can be used. Furthermore, as the material for the batt fibers, materials that can be used for the reinforcing fiber base material 111 in the embodiment described above can be used singly or in combination of two or more.

Further, as described above, batt fiber layers are arranged on both sides of the reinforcing fiber base material layer 11B in conjunction with the formation of the first resin layer 13B and the second resin layer 15B. Such a batt fiber layer is formed by arranging batt fibers on both sides of the reinforcing fiber base layer 11B and entangling the batt fibers with the reinforcing fiber base layer 11B by needling. Therefore, batt fibers are entangled with the reinforcing fiber base material 111B of the reinforcing fiber base material layer 11B. Note that the other configurations of the reinforcing fiber base material layer 11B are the same as those of the reinforcing fiber base material 111 of the embodiment described above.

As explained above, in this modification, the first resin layer 13B and the second resin layer 15B contain not only resin but also batt fibers. In this way, when the first resin layer 13B and the second resin layer 15B contain batt fibers, the first surface 131B of the first resin layer 13B and the second surface 151B of the second resin layer 15B have a moderate amount of fiber. This causes unevenness. As a result, the adhesion and releasability of the wet paper web W can be more easily controlled on the first surface 131B. In addition, sufficient friction can be obtained on the second surface 151B against the rolls in contact with it, and power from the rolls can be transmitted to the wet paper web conveying belt 1 more efficiently. Furthermore, the second surface 151B can be made uneven by arranging batt fibers on the second surface 151B, thereby preventing the so-called hydroplaning phenomenon in which the wet paper web conveying belt 1B and the roll slip. can do.

Furthermore, when applying the resin material at the time of forming the first resin layer 13B and the second resin layer 15B, the rate of impregnation of the resin material into the batt fibers and the reinforcing fiber base material layer 11B is determined by the batt fibers. It will be smaller than if it does not exist. As a result, the first resin layer 13B and the second resin layer 15B can have sufficient thickness, and the wet paper web conveying belt 1 can have sufficient durability and strength.

On the other hand, when batt fibers are included in the resin layer as in the first resin layer 13B and the second resin layer 15B, the batt fibers absorb moisture and swell, so that the wet paper web conveying belt generally Warpage tends to occur at the edges. However, since the wet paper web conveyance belt 1B includes the reinforcing fiber base material layer 11B as described above, the occurrence of warpage at the end portions of the wet paper web conveyance belt 1B is suppressed.

(2.3. Other variations)
In the embodiment described above, the woven fabric included in the reinforcing fiber base layer 11 has a double structure, but the present invention is not limited thereto, and may have a triple or more layer structure. In this case, among any two parallel warps or wefts of the layered structure of the woven fabric, the threads arranged on the second surface side include polyester threads. Preferably, among the parallel warps or wefts of the layered structure of the woven fabric, the yarn closest to the second surface (roll side) contains polyester yarn.

Further, in the embodiment described above, the second warp 117 of the woven fabric included in the reinforcing fiber base layer 11 included polyester yarn, but the present invention is not limited to this, and the woven fabric included in the reinforcing fiber base layer 11 is a weft multiple weave, and of the two parallel wefts, the weft on the second surface side (roll side) may contain polyester yarn.

Further, in the second modification described above, the first resin layer 13B and the second resin layer 15B containing batt fibers were formed on both sides of the reinforcing fiber base layer 11B, but the present invention is not limited to this. First, a resin layer containing batt fibers may be formed only on one side of the reinforcing fiber base layer.

<4. Manufacturing method of paper belt>
Next, some examples of preferred embodiments of the above-described method for manufacturing a papermaking belt of the present invention will be described. In this embodiment, a method for manufacturing a wet paper web conveying belt 1 will be representatively described as an example of a papermaking belt. The wet paper web conveying belt 1 may be manufactured by any method. Below, as methods for manufacturing the wet paper web conveying belt 1, a back coat inversion manufacturing method and a front coat penetration manufacturing method will be representatively explained.

First, the back coat reversal manufacturing method will be described with reference to FIGS. 9 and 10. 9 and 10 are schematic diagrams for explaining a preferred embodiment of the method for manufacturing a papermaking belt according to the present invention. First, as shown in FIG. 9, an endless reinforcing fiber base material 111 is placed in contact with two rolls 21 arranged in parallel. At this time, the reinforcing fiber base material 111 is arranged so that the first warp threads 115 of the reinforcing fiber base material 111 are in contact with the roll 21 . Next, while rotating the roll 21, from the side where the second warp 117 of the reinforcing fiber base material 111 is arranged, that is, from the outside of the reinforcing fiber base material 111 currently being hung, from the resin discharge port 25 of the coater. , a resin material for forming the second resin layer 15 is discharged onto the surface of the reinforcing fiber base material 111, and the coater bar 23 is used to coat the resin material. Next, the applied resin material is cured by heating to form the second resin layer 15.

Next, as shown in FIG. 10, the reinforcing fiber base material 111 is reversed and hung so that the formed second resin layer 15 comes into contact with the roll 21. Thereafter, the resin 113 of the reinforcing fiber base material layer 11 and the resin material constituting the first resin layer 13 are discharged onto the surface of the reinforcing fiber base material 111 from the resin discharge port 25 of the coater, and the coater bar 23 is The resin material is coated using the resin material. As a result, the reinforcing fiber base material 111 is impregnated with the resin material to constitute the resin 113, and a precursor of the first resin layer 13 is formed on the reinforcing fiber base material 111. Then, the resin laminate including the obtained reinforcing fiber base material 111 is heated and cured to form a wet paper paper in which the first resin layer 13, the reinforcing fiber base material layer 11, and the second resin layer 15 are laminated in this order. A conveyor belt 1 is obtained. Note that, if necessary, the first surface 131 of the first resin layer 13 and/or the second surface 151 of the second resin layer 15 may be polished using a polishing device.

Next, the surface coat penetration manufacturing method will be described with reference to FIGS. 11 and 12. FIGS. 11 and 12 are schematic diagrams for explaining a preferred embodiment of the method for manufacturing a papermaking belt according to the present invention. First, as shown in FIG. 11, an endless reinforcing fiber base material 111 is placed in contact with two rolls 21 arranged in parallel. At this time, the reinforcing fiber base material 111 is arranged so that the second warp 117 of the reinforcing fiber base material 111 is in contact with the roll 21 . Next, while rotating the roll, from the side where the first warp 115 of the reinforcing fiber base material 111 is arranged, that is, from the outside of the reinforcing fiber base material 111 that is currently being hung, from the resin discharge port 25 of the coater, The resin material is discharged onto the surface of the reinforcing fiber base material 111, and coated with the resin material using the coater bar 23. The resin material applied at this time can penetrate the reinforcing fiber base material 111. Therefore, in this embodiment, it is possible to form not only the resin 113 contained in the reinforcing fiber base material 111 but also the resin constituting the second resin layer 15, and the resin 113 contained in the reinforcing fiber base material layer 11 and the second resin layer 15 can be formed. It is possible to form the resin layer 15 at the same time.

Next, as shown in FIG. 12, a resin material for the first resin layer 13 is applied to the outer surface of the formed reinforcing fiber base layer 11. Specifically, the formed reinforcing fiber base material layer 11 and second resin layer 15 are rotated by the roll 21 while the resin material is discharged from the resin discharge port 25 to coat the outer surface of the reinforcing fiber base material layer 11. This is done by applying a resin material. Further, the resin material applied at the same time is uniformly applied using the coater bar 23. Note that the resin material constituting each layer may be applied as a mixture with the above-mentioned inorganic filler.

Next, the applied resin material is dried and cured. As a result, a wet paper web conveying belt 1 is obtained in which the first resin layer 13, the reinforcing fiber base material layer 11, and the second resin layer 15 are laminated in this order from the outer surface. Note that, if necessary, the first surface 131 of the first resin layer 13 and/or the second surface 151 of the second resin layer 15 may be polished using a polishing device.

Although the present invention has been described in detail based on the preferred embodiments above, the present invention is not limited thereto, and each configuration can be replaced with any one that can perform the same function, or any It is also possible to add the following configuration.

Furthermore, in the above description, a wet paper web conveying belt was used as an example of a papermaking belt, but the present invention is not limited thereto. For example, the papermaking belt of the present invention may be a shoe press belt or another papermaking belt.

EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited by these Examples.

1. Manufacture of wet paper web conveyor belt (Example 1)
A wet paper web conveying belt according to Example 1 was manufactured as follows using a surface coat penetration manufacturing method.

(i) Preparation of reinforcing fiber base material First, a woven fabric with a warp double structure having the following configuration was prepared as a reinforcing fiber base material.
・First warp: 3810 dtex monofilament twisted yarn made of polyamide 6 (2 monofilaments of 370 dtex polyamide 6 were twisted together, and 5 of these were twisted together. The first twist was 2.1 times/cm, and the final twist was , 1.2 times/cm)
・Second warp: 3396 dtex multifilament twisted yarn made of polyethylene terephthalate (118 filaments of 8.5 dtex polyethylene terephthalate were drawn and twisted together, and three of them were twisted together. The final twist was 0.1 turns/cm. did.)

- Weft: 1582 dtex monofilament twisted yarn made of polyamide 610 (two monofilaments of 370 dtex polyamide 610 were twisted together, and the two were twisted together. The first twist was 3.1 times/cm, and the final twist was 2.0 times/cm. (2 times/cm)
・ Structure: 35 upper and lower warps/5cm, 40 wefts/5cm, double warp structure (3/1 1/7, equivalent to the structure in Figures 2 to 4)

(ii) Formation of laminate First, the prepared endless reinforcing fiber base material was placed between two rolls arranged in parallel. At this time, the reinforcing fiber base material was placed on the roll so that the second warp of the reinforcing fiber base material came into contact with the roll. While rotating the roll, the urethane composition was applied to the surface of the reinforcing fiber base material where the first warp was exposed. The urethane composition is prepared by reacting a mixture of 2,4-tolylene diisocyanate (2,4-TDI) and 2,6-tolylene diisocyanate (2,6-TDI) with polytetramethylene ether glycol (PTMG). A mixture of the obtained urethane prepolymer and dimethylthiotoluenediamine (DMTDA) as a curing agent was used.

When this urethane composition was applied, the urethane composition impregnated the reinforcing fiber base material and penetrated through the reinforcing fiber base material, so that the reinforcing fiber base material layer and the second resin layer on the roll side were simultaneously formed. Next, the urethane composition of the first resin layer on each wet paper web carrying side was applied to the outer surface of the formed reinforcing fiber base layer, and the first resin layer was laminated. Starting from the outermost layer, the laminate consisting of the first resin layer, reinforcing fiber base layer, and second resin layer was heated and dried to obtain a semi-finished wet paper web conveying belt.
(iii) Polishing and buffing The surface of the wet paper paper carrying side of the wet paper web conveying belt (semi-finished product) was polished by appropriately setting coated abrasive paper of #80 to #600 in a polishing device. Further, in order to adjust the surface roughness of the wet paper web contacting surface, buffing was performed as appropriate, and the arithmetic mean roughness of the wet paper web carrying surface of the wet paper web conveying belt in each example was set to 0.3 to 20 μm. Through the above steps, the wet paper web conveying belt according to Example 1 was completed.
The manufacturing dimensions of the wet paper web conveying belt were 20 m in length and 700 mm in width.

(Example 2)
A wet paper web conveyance belt according to Example 2 was manufactured in the same manner as Example 1 except that the reinforcing fiber base material was changed as follows.
The reinforcing fiber base material used in Example 2 used the same second warp, weft, and fabric structure as the reinforcing fiber base material used in Example 1, while the following was used as the first warp. Using.
・First warp: 2271 dtex monofilament twisted yarn made of polyamide 6 (two 370 dtex polyamide 6 monofilaments were twisted together, and three of these were twisted together. The first twist was 2.7 times/cm, and the final twist was , 2.1 times/cm)

(Example 3)
A wet paper web conveying belt according to Example 3 was manufactured in the same manner as in Example 1, except that the reinforcing fiber base material was changed as follows.
The reinforcing fiber base material used in Example 3 used the same first warp, second warp, and fabric structure as the reinforcing fiber base material used in Example 1, while the following were used as the weft. Using.
・Weft: 1059 dtex monofilament single yarn made of polyamide 610

(Example 4)
A wet paper web conveying belt according to Example 4 was produced in the same manner as in Example 1, except that the reinforcing fiber base material was changed as follows.
The reinforcing fiber base material used in Example 4 used the same second warp and textile structure as the reinforcing fiber base material used in Example 1, while the following were used as the first warp and weft. Using.
・First warp: 2271 dtex monofilament twisted yarn made of polyamide 6 (two 370 dtex polyamide 6 monofilaments were twisted together, and three of these were twisted together. The first twist was 2.7 times/cm, and the final twist was , 2.1 times/cm)
・Weft: 1059 dtex monofilament single yarn made of polyamide 610

(Example 5)
A wet paper web conveyance belt according to Example 5 was manufactured in the same manner as in Example 2, except that the reinforcing fiber base material was changed as follows.
The reinforcing fiber base material used in Example 5 used the same first warp, second warp, and weft as the reinforcing fiber base material used in Example 2, and on the other hand, a warp double weave was used as the textile structure. (3/1 1/3, corresponding to the structures shown in Figures 5 to 7).

(Example 6)
A wet paper web conveying belt according to Example 6 was produced in the same manner as in Example 5, except that batt fibers were needled on both sides of the reinforcing fiber base material to form batt fiber layers.
In Example 6, short fibers made of polyamide 66 with a length of 22 dtex and a cut length of 76 mm were used as batt fibers, and on the side where the first resin layer was formed (wet paper web carrying side), the fibers were 100 g/m ² and the second resin layer was On the layer forming side (roll side), batt fiber layers were formed on both sides so that the basis weight was 100 g/m ² .

(Comparative example 1)
A wet paper web conveyance belt according to Comparative Example 1 was manufactured in the same manner as in Example 1, except that the reinforcing fiber base material was changed as follows.
- First warp and second warp: twisted yarn of 2271 dtex monofilament made of polyamide 6 (two monofilaments of 370 dtex polyamide 6 were twisted together, and three of these were twisted together. The first twist was 2.7 times/ cm, and the ply twist was 2.1 times/cm.)
- Weft: 1582 dtex monofilament twisted yarn made of polyamide 610 (two monofilaments of 370 dtex polyamide 610 were twisted together, and the two were twisted together. The first twist was 3.1 times/cm, and the final twist was 2.0 times/cm. (2 times/cm)
・ Structure: 35 upper and lower warps/5cm, 40 wefts/5cm, double warp structure (3/1 1/3, equivalent to the structures in Figures 5 to 7)
In addition, for the reinforcing fiber base material, short fibers made of polyamide 66 with a length of 22 dtex and a cut length of 22 mm were used as ^batt fibers. On the side where the second resin layer was formed (roll side), batt fiber layers were formed on both sides so that the basis weight was 100 g/m ² .

(Comparative example 2)
A wet paper web conveyance belt according to Comparative Example 2 was manufactured in the same manner as in Example 1, except that the reinforcing fiber base material was changed as follows.
・First warp: 2271 dtex monofilament twisted yarn made of polyamide 6 (two 370 dtex polyamide 6 monofilaments were twisted together, and three of these were twisted together. The first twist was 2.7 times/cm, and the final twist was , 2.1 times/cm)
・Second warp: 3333 dtex multifilament twisted yarn made of polyamide 6 (68 filaments of 22.1 dtex polyamide 6 were drawn and twisted together, and two of these were twisted together. The first twist was 0.7 times. /cm, and the final twist was 0.7 times/cm.)

・ Weft: Single monofilament yarn of 1059 dtex made of polyamide 610 ・ Structure: 35 upper and lower warps/5 cm, 40 wefts/5 cm, double warp structure (3/1 1/7, structure shown in Figures 2 to 4) )

2. Evaluation The produced wet paper web conveying belts of Examples 1 to 6 and Comparative Examples 1 and 2 were evaluated for the occurrence of warpage at the ends according to the following procedure.
First, a test piece S having a length of 3.2 m and a width of 22 cm was cut out from the wet paper web conveying belts of Examples 1 to 6 and Comparative Examples 1 and 2. Next, the test pieces S of each of Examples 1 to 6 and Comparative Examples 1 and 2 were immersed in water for 24 hours in a room with a room temperature of 20±2° C. and a humidity of 50±10%.

Next, the longitudinal ends of the test pieces S of each of Examples 1 to 6 and Comparative Examples 1 and 2 were made endless with suture thread. Then, each test piece S was hung between two parallel rolls 30, as shown in FIG. Next, the roll 30 was rotated to rotate the test piece S twice at a cloth speed of 4 m/min, and water 41 was sprayed from the sprayer 40 onto the surface of the test piece.

After the spraying, the tension acting on the test piece S was adjusted to 5 kN/m, and then the roll 30 was stopped. Then, as shown in FIG. 14, the metal rule 50 is brought into contact with the second resin layer side of the test piece S, the metal rule 50 is adjusted horizontally, and the test piece farthest from the metal rule 50 is The distance from the S part was measured as the ear curl amounts d ₁ and d ₂ . Note that the end portion of the test piece S may be warped toward the roll side, that is, toward the metal scale 50 side. In this case, the distance between the highest point near the center in the width direction of the test piece S and the metal ruler 50 was measured as the amount of edge curl. The amount of edge curl was measured at four locations, and the average value was taken as the amount of edge curl of the test piece S.

The above evaluation results are shown in Tables 1 and 2 together with the structures of the reinforcing fiber base materials of Examples 1 to 6 and Comparative Examples 1 and 2.

As shown in Tables 1 and 2, the wet paper web conveyance belts according to Examples 1 to 6 have a smaller amount of edge curling than the wet paper web conveyance belts according to Comparative Examples 1 and 2, and the warping of the ends is suppressed. was. In addition, in the above evaluation, a test piece S with a width of 22 cm was used, but the wet paper web conveying belt that is hooked onto an actual paper machine has a width of several meters, and the warpage of the ends is approximately proportional to this. also becomes larger.

Further, when comparing Example 1 and Example 2, and Example 3 and Example 4, it is found that Example 1 has a fineness of the first warp on the wet paper paper carrying side than the fineness of the second warp on the roll side. , 3, the fineness of the first warp on the wet paper web carrying side is smaller than the fineness of the second warp on the roll side, compared to the wet paper web conveyance belt according to Examples 2 and 4. The amount of curling of the ears was small, and the warping of the ends was suppressed.

Further, when comparing Example 1 and Example 3 and Example 2 and Example 4, it is found that the wet paper web conveying belts according to Examples 1 and 3 using monofilament twisted yarn as the weft, Compared to the wet paper web conveying belts according to Examples 2 and 4 using the wet paper web conveying belts, the amount of edge curling was small and the warping of the ends was suppressed.

Further, when comparing Example 2 and Example 5, the wet paper web conveying belt according to Example 2 using the reinforcing fiber base material having a woven structure of 3/1 1/7 has a fabric structure of 3/1 1/3. The amount of edge curl was smaller than that of the wet paper web conveying belt according to Example 5, which used a reinforcing fiber base material having a woven texture.

Further, when comparing Example 5 and Example 6, the wet paper web conveying belt according to Example 5, which does not have a batt fiber layer on the reinforcing fiber base material, is different from that in Example 6, which has a batt fiber layer on the reinforcing fiber base material. The amount of edge curl was smaller than that of the wet paper web conveying belt. On the other hand, the wet paper web conveyance belt according to Example 6, which has a batt fiber layer in the reinforcing fiber base material, also has a smaller amount of edge curling and less warpage at the ends compared to the wet paper web conveyance belts according to Comparative Examples 1 and 2. was suppressed.

1, 1A, 1B Wet paper paper conveyor belt (papermaking belt)
11, 11B Reinforcing fiber base layer 111, 111A, 111B Reinforcing fiber base material 113 Resin 115, 115A First warp 117, 117A Second warp 119, 119A Weft 13, 13B First resin layer 131, 131B First surface (wet paper contact surface)
151, 151B Second resin layer (roll contact surface)

Claims (11)

A papermaking belt used in a papermaking machine and having a first surface on which wet paper is placed and a second surface opposite to the first surface,
having a reinforcing fiber base layer including at least one layer of woven fabric;
At least one layer of the woven fabric has a double or more layered structure,
The layered structure has first threads and second threads arranged in parallel,
the first thread is arranged on a first surface more than the second thread, the second thread is arranged on a second face more than the first thread,
The papermaking belt, wherein the second yarn includes a polyester yarn. The papermaking belt according to claim 1, wherein the second thread is crimped. The papermaking belt according to claim 1, wherein the second yarn is a multifilament twisted yarn. The papermaking belt of claim 1, wherein the first thread and the second thread are arranged along the machine direction of the papermaking belt. The papermaking belt according to claim 1, which does not have a batt layer. The papermaking belt according to claim 1, wherein the fineness of the first yarn is larger than the fineness of the second yarn. The woven fabric further includes a third thread woven into the first thread and the second thread,
The papermaking belt according to claim 1, wherein the third yarn is a twisted monofilament yarn. The woven fabric having the layered structure further includes a third thread woven into the first thread and the second thread,
The layered structure includes a repetition in which the third thread passes through the first surface side of the K number of the first threads and passes through the second surface side of the L number of the first threads. , it is possible to simultaneously form repetitions in which the third thread passes through the first surface side of the M number of the second threads and passes through the second surface side of the N number of the second threads. It is a tissue with repeating units,
The papermaking belt according to claim 1, which satisfies the relationship K/L≧N/M. The woven fabric having the layered structure further includes a third thread woven into the first thread and the second thread,
The number of crossing points of the first thread and the third thread in a complete tissue is larger than the number of crossing points of the second thread and the third thread in a complete tissue. Paper making belt. The papermaking belt according to claim 1, which is a wet paper web conveying belt. The papermaking belt according to claim 1, which is a shoe press belt.

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