JP7015746B2 - Industrial textiles - Google Patents

Description

The present disclosure relates to industrial fabrics used in processes involving squeezing water from a moist paper material.

In a pulp machine that forms a pulp sheet, water is removed from a suspension of paper material in a press part, and the pulp is further pressed to squeeze water. Various woven fabrics for transporting water-containing paper materials used in this step have been proposed.

For example, Patent Documents 1 and 2 describe the fabrics used in this step. The woven fabrics described in Patent Documents 1 and 2 include warp yarns made of monofilaments, yarns in which small-diameter yarns such as multifilaments are put together to form a fine water-squeezed space between the yarns, and two types of wefts, monofilaments. It is a woven fabric having one layer of warp and two layers of weft. In the upper layer weft, one multifilament and one monofilament are alternately arranged, and in the lower weft, one or two multifilaments and two monofilaments are alternately arranged.

Japanese Patent No. 3793408 Japanese Patent No. 4828330

The water-containing paper material transported to the woven fabrics described in Patent Documents 1 and 2 is pressed by a roll having a rotation axis in the weft direction (cross machine direction), and the water squeezed by the press is in the warp direction (cross machine direction). Try to move in the direction of the machine). However, in the woven fabrics described in Patent Documents 1 and 2, since the extending direction of the multifilament is the weft direction, the movement of water in the warp direction is small and the amount of water squeezed is small. In addition, since the multifilament flattens with use, there is no gap between the monofilament and the weft due to its structure, which causes a decrease in water squeezing. Even if a structure in which two monofilaments of warp and weft were arranged side by side so that the gap between them could be maintained until the end of use, the press area by the multifilament was reduced, so that the water squeezing could not be sufficiently improved.

In view of such problems, it is an object of the present invention to provide an improvement in water squeezing in an industrial woven fabric used in a process including squeezing water from a water-containing paper material.

At least some embodiments of the present invention are industrial fabrics (1,11) used in a process comprising squeezing water from a water-containing paper material, the upper layer (4) and the lower layer (5). With a first warp (2a) arranged in two layers and made of a monofilament or a monofilament twisted yarn, and a warp (2) having a second warp (2b) thicker than the first warp and made of a twisted yarn containing a multifilament. It has a weft (3) arranged in one layer and made of a monofilament or a monofilament twisted yarn, and the weft has two adjacent yarns as a set, and each set has the same pattern as the first warp and the first warp. A predetermined number of the first warp and a predetermined number of the second warp are alternately arranged in each of the upper layer and the lower layer, which are entwined with the second warp, and the first warp and the first warp are arranged alternately. The two warps are characterized in that they do not overlap each other at the top and bottom.

According to this configuration, since the second warp is greatly bent by one set of wefts, the second warp is in contact with the roll for pressing, and the second warp composed of a twisted yarn containing a multifilament that absorbs water is formed. The second warp that not only exists in the warp direction but also forms a convex portion that applies pressure to the wet paper and the first warp thread that forms a concave portion that serves as an escape route for water that cannot be absorbed are present in the warp direction. As a result, water squeezing is improved. Further, since the bending of the second warp creates a gap in the diagonal weft direction between the first warp and the second warp, even at the end of use when the second warp made of a twisted yarn containing a multifilament is flattened, it is squeezed. The water content is stable and clogging due to dirt is unlikely to occur until the end of use.

The industrial woven fabric according to at least some embodiments of the present invention is a bag-shaped woven fabric having an endless shape in the warp direction in the above configuration, and the first warp is a core wire (6) extending in the weft direction. By folding back at and forming a loop (7), the second warp may move between the upper layer and the lower layer, and the second warp may form the loop before and after the warp direction of the core wire for forming the loop. The second warp that moves between the upper layer and the lower layer without moving between the upper layer and the lower layer in front of the core wire, and the second warp that moves between the upper layer and the lower layer behind the core wire. The second warp is characterized in that it is arranged alternately for each predetermined number.

According to this configuration, the industrial woven fabric according to the present invention can be woven by a loom having two or more shuttles. Further, since the upper and lower interchanged portions of the relatively thick second warp are dispersed before and after the loop, the number of warps can be increased. Further, since the core wire functions as a warp and weft, the thickness of the replacement portion becomes the same as that of the other portions, and uneven water squeezing of the selvage portion is suppressed.

In any of the above configurations, the industrial woven fabric according to at least some embodiments of the present invention has one said first warp and one said second warp in each of the upper layer and the lower layer. , Characterized by being arranged alternately.

According to this configuration, the gap in the diagonal weft direction between the first warp and the second warp is increased, and the water squeezing is more stable even at the end of use when the second warp composed of the twisted yarn containing the multifilament is flattened. do.

In the industrial woven fabric (1) according to at least some embodiments of the present invention, in the above configuration, the first warp and the second warp overlap each other up and down, and the pattern is a set of the warp and weft. Above one warp in the upper layer, between one warp in the upper layer and one warp in the lower layer, below one warp in the lower layer, one warp in the upper layer. It is characterized in that it is formed by passing in the order between the warp and the warp of the lower layer.

According to this configuration, the second warp 2b is greatly bent to improve water squeezing.

In any of the above configurations, the industrial woven fabric according to at least some embodiments of the present invention has a monofilament having a diameter of 0.4 mm to 0.65 mm, or a monofilament having a diameter of 0.4 mm to 0.65 mm, each of which is 0.18 mm to 0. The second warp consists of 4 to 6 twisted yarns of monofilament having a diameter of .28 mm, the second warp containing a multifilament having a thickness of 5d to 50d, and from a twisted yarn having a thickness of 3000d to 6000d as a whole. It is characterized by becoming.

According to this configuration, the water squeezing is further improved.

According to the present invention, water squeezing is improved in an industrial woven fabric used in a process including squeezing water from a water-containing paper material.

Cross-sectional view in a cross section orthogonal to the warp direction of the industrial woven fabric according to the first embodiment. Explanatory drawing which shows weaving method of industrial woven fabric in comparative example and 1st Embodiment Cross-sectional view of the industrial woven fabric according to the second embodiment in a cross section orthogonal to the warp direction. Photograph of the industrial woven fabric according to the embodiment (A: upper surface, B: photograph of the surface from which the warp and weft was cut from the weft direction, C: photograph of the surface from which the warp and weft was cut from diagonally above the weft) Photographs showing the results of pressure distribution measurement according to Comparative Examples and Examples (A: Comparative Example, B: Bag selvage on the replacement portion side, C: Bag selvage on the opposite side to the replacement portion)

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of the industrial woven fabric 1 according to the first embodiment in a cross section orthogonal to the warp direction. The industrial woven fabric 1 is a woven fabric having two layers of warp and one layer of weft (double weft and one layer of warp). The industrial woven fabric 1 is endless in the warp direction, is hung on a roll of a machine, and travels according to the rotation of the roll. The water-containing paper material is transported to the industrial woven fabric 1 and pressed into a water-squeezing roll to be squeezed.

The industrial woven fabric 1 has a warp 2 and a warp 3 woven into the warp 2. The warp 2 is arranged in two layers of the upper layer 4 and the lower layer 5, and the weft 3 is arranged in one layer so as to be woven into the warp of the upper layer 4 and the lower layer 5. Two types of warp 2 of the first warp 2a and the second warp 2b are used for each of the upper layer 4 and the lower layer 5. The first warp 2a consists of a monofilament or a twisted monofilament, preferably four to six monofilaments having a diameter of 0.4 mm to 0.65 mm, or monofilaments each having a diameter of 0.18 mm to 0.28 mm. It consists of twisted yarn of a book. The second warp 2b is thicker than the first warp 2a. The second warp 2b comprises a twisted yarn containing a multifilament, for example, a twisted yarn of a multifilament, or a twisted yarn of a multifilament and a spun yarn or a monofilament, preferably containing a multifilament having a thickness of 5d to 50d, and It is composed of a twisted yarn having a thickness of 3000d to 6000d as a whole.

In each of the upper layer 4 and the lower layer 5, a predetermined number of first warp yarns 2a and a predetermined number of second warp yarns 2b (the same number as or different from the first warp yarn 2a) are alternately arranged, which is preferable. The first warp 2a and the second warp 2b are alternately arranged one by one. The first warp threads 2a and the second warp threads 2b do not overlap each other vertically, and preferably the first warp threads 2a and the second warp threads 2b overlap each other vertically.

The warp and weft 3 is composed of a monofilament or a monofilament twisted yarn, and is entwined with the first warp 2a and the second warp 2b in the same pattern for each set as a set of two. The pattern in which the weft 3 is entwined with the warp 2 is such that a set of wefts 3 is placed above one warp 2 in the upper layer 4, between one warp 2 in the upper layer 4 and one warp 2 in the lower layer 5, and the lower layer 5 It is formed so as to pass under one warp 2 of the above layer 4 and between one warp 2 of the upper layer 4 and one warp 2 of the lower layer 5.

Two first warp threads 2a and two second warp threads 2b arranged in the upper layer 4, two first warp threads 2a and two second warp threads 2b arranged in the lower layer 5, and four sets (8 in total). The complete structure is composed of the weft 3 of the book). The monofilament or multifilament used for the warp 2 and the weft 3 is made of a synthetic resin such as polyamide, polyester, polyethylene, polypropylene and polyvinyl chloride.

The operation and effect of the industrial woven fabric 1 according to the first embodiment will be described. The second warp 2b made of a twisted yarn containing a multifilament extends in the warp direction and forms a convex portion that applies pressure to the wet paper, and a concave portion that serves as an escape route for water that cannot be completely absorbed. Since the first warp 2a is present in the warp direction, water easily moves in the warp direction, which is the traveling direction of the industrial woven fabric 1. Further, since the two warp threads 3 and 3 adjacent to each other form a set to form the same structure and give a large bend to the second warp thread 2b, the second warp thread 2b comes into contact with the roll for pressing. .. Therefore, the water receives a large force including the meridional component from the roll, and more water can be squeezed. Even if the amount of voids decreases, water moves in the warp direction, which makes it difficult for water to be squeezed poorly. When the weft 3 is woven between the first warp 2a and the second warp 2b, as shown by the arrow in FIG. 1, the gap in the diagonal weft direction caused by the step between the second warp 2b and the first warp 2a causes an initial stage. As the amount of voids increases, water squeezing becomes stable until the end of use, and clogging due to dirt is less likely to occur until the end of use.

FIG. 2 shows a weaving method for the industrial woven fabric 1. In the industrial woven fabric 1 woven by bag weaving, the warp and weft 3 is the warp and warp yarn at the time of weaving, and the warp and yarn 2 is the driving yarn at the time of weaving. Weaving is possible if there are a total of 4 shuttles for the 1st warp 2a of the upper layer 4, the 2nd warp 2b of the upper layer 4, the 1st warp 2a of the lower layer 5, and the 2nd warp 2b of the lower layer 5. However, looms with four or more shuttles are not widely used. Therefore, a method of weaving the industrial woven fabric 1 with two shuttles will be described. In this case, the first warp 2a of the upper layer 4 and the first warp 2a of the lower layer 5 are of the same type, and the second warp 2b of the upper layer 4 and the second warp 2b of the lower layer 5 are of the same type. ..

In the left figure of FIG. 2, the warp 2 is woven by exchanging the upper and lower sides of the warp 2 at one of the selvage ears (right side of the paper surface) at the time of weaving (moving the warp 2 from the upper layer 4 to the lower layer 5 and from the lower layer 5 to the upper layer). The right figure of FIG. 2 shows a state in which the bag ears of the industrial woven fabric 1 attached to the device extend straight back and forth (left and right of the paper surface).

As shown in Comparative Example 1 of FIG. 2A, the first warp 2a and the second warp 2b are between one set of wefts 3 and 3 and another set of wefts 3 and 3 adjacent thereto. When the upper and lower parts of each of the above are exchanged, the distance between one set of wefts 3 and 3 and another set of wefts 3 and 3 adjacent thereto becomes larger in the upper and lower exchanged parts than in the other parts. As a result, the thickness of the upper and lower interchanged portions becomes thinner than that of the other portions, which causes vibration and uneven wear. Even if the first warp 2a is separated from the left selvage ear and the second warp 2b is separated from the right selvage selvage, the difference in thread thickness is too large, which is meaningless, such as vibration and uneven wear. It only increases the dangerous part of.

As shown in Comparative Example 2 of FIG. 2B, a loop 7 is formed with respect to the core wire 6 with a predetermined set of wefts 3 and 3 as the core wire 6 for each of the first warp yarn 2a and the second warp yarn 2b. When the loop 7 is folded back and the top and bottom are exchanged, the number of warp threads 2 in the loop 7 becomes twice as thick as that in the other portions, which causes vibration. Further, since there is a loop 7 portion in which the number of warp threads 2 is doubled, the number of warp threads 2 per unit width cannot be increased.

Therefore, in the industrial woven fabric 1 according to the first embodiment, as shown in FIGS. 2C and 2D, the relatively thin first warp yarn 2a is folded back and forth by the core wire 6 so as to form a loop 7. The relatively thick second warp 2b is swapped up and down without forming a loop (without folding back) before and after the core wire 6. The second warp 2b whose upper and lower parts are exchanged in front of the core wire 6 and the second warp 2b whose upper and lower parts are exchanged behind the core wire 6 are alternately arranged in a predetermined number. In the illustrated example, the second warp 2b that moves from the upper layer 4 to the lower layer 5 behind the core wire 6, the second warp 2b that moves from the lower layer 5 to the upper layer 4 behind the core wire 6, and the upper layer 4 to the lower layer 5 in front of the core wire 6. The moving second warp 2b and the second warp 2b moving from the lower layer 5 to the upper layer 4 in front of the core wire 6 are arranged in this order.

Since the overlapping portion of the relatively thick second warp 2b is dispersed before and after the core wire 6, the number of warps 2 can be increased. Further, since the core wire 6 functions as the weft 3, the thickness of the replacement portion is substantially the same as the thickness of the other portion, and vibration and uneven wear can be suppressed.

Next, the industrial woven fabric 11 according to the second embodiment will be described with reference to FIG. In the description, the configurations common to the first embodiment are omitted from the description and the same reference numerals are given. The industrial woven fabric 11 according to the second embodiment is different from the first embodiment in the weaving pattern of the weft 3 into the warp 2.

In the industrial fabric 11, the warp 2 is arranged in the same manner as in the first embodiment, and the weft 3 is placed on the warp 2 of the upper layer 4, one warp 2 of the upper layer 4, and one of the lower layer 5. Between the warp 2 and above one warp 2 in the upper layer 4, between one warp 2 in the upper layer 4 and one warp 2 in the lower layer 5, below and above one warp 2 in the lower layer 5. Between one warp 2 of 4 and one warp 2 of the lower layer 5, under one warp 2 of the lower layer 5, one warp 2 of the upper layer 4 and one warp 2 of the lower layer 5. The weaving pattern of the weft 3 into the warp 2 is formed by passing the wefts 3 in the order between them.

FIG. 4 is a photograph of an embodiment corresponding to the first embodiment. The first warp 2a is made of monofilament, the second warp 2b is made of multifilament twisted yarn, and the weft 3 is made of monofilament.

As shown in FIG. 4A, the second warp 2b made of a multifilament twisted yarn that moves water squeezed from the pressed paper material by a capillary phenomenon or the like extends in the warp direction and becomes a wet paper. The second warp 2b forming a convex portion to which pressure is applied and the first warp 2a forming a concave portion serving as an escape route for water that cannot be completely absorbed exist in the warp direction. Since the direction of the pressure received from the press roll contains the meridional component, water can be efficiently squeezed.

As shown in FIG. 4B, the uppermost portion and the lowermost portion of the second warp yarn 2b are the uppermost portion and the lowermost portion of the industrial woven fabric 1. This is because two sets of wefts 3 and 3 adjacent to each other are entwined with the warp 2 in the same pattern for each set, so that the second warp 2b is greatly bent. As a result, the second warp 2b comes into contact with the roll for pressing directly or via a paper material, so that the water squeezing property is improved.

As shown in FIG. 4C, a gap is formed in the diagonal weft direction between the second warp 2b and the first warp 2a adjacent to each other. This is also because two sets of wefts 3 and 3 adjacent to each other are entwined with the warp 2 in the same pattern for each set, so that the second warp 2b is greatly bent. As a result, even if the second warp 2b made of multifilament twisted yarn is flattened, the decrease in water squeezing is suppressed, and clogging due to dirt is unlikely to occur until the end of use.

5 (A) shows the results of pressure distribution measurement of the replacement portion of the warp 2 of the woven fabric corresponding to Comparative Example 1 shown in FIG. 2 (A), and FIG. 5 (B) shows FIGS. 2 (C) and (2). The result of the pressure distribution measurement of the replacement part of the industrial woven fabric 1 of the Example corresponding to the 1st Embodiment shown in D) is shown, and FIG. The result of the pressure distribution measurement of the side sac ear is shown. In the photograph of the measurement result, the dark part indicates that the pressure is high, and the light part indicates that the pressure is low.

As shown in FIG. 5A, in Comparative Example 1 in which the replacement portion becomes thin, the pressure applied to the replacement portion becomes small, and the water squeezing decreases. As shown in FIG. 5B, in a configuration in which the first warp forms a loop and is switched up and down, and the second warp is switched up and down before and after the core wire, the pressure of the replacement portion and the normal portion (other than the bag ear portion). The pressure and difference of the part) are small. Further, as shown in FIG. 5C, the pressure of the selvage portion on the opposite side of the replacement portion is substantially the same as the pressure of the normal portion. As described above, in the configuration in which the first warp forms a loop and is swapped up and down, and the second warp is swapped up and down before and after the core wire, compared to the configuration in which the warp is swapped up and down at one place without forming a loop. , Water squeezing and paper surface are good.

Although the description of the specific embodiment is completed above, the present invention can be widely modified without being limited to the above embodiment. For example, as the core wire, a different type and / or number of threads from the set of weft threads may be used. The industrial woven fabric according to the present invention may be applied to the base fabric of the felt for papermaking.

1,11: Industrial woven fabric 2: Warp 2a: First warp 2b: Second warp 3: Weft 4: Upper layer 5: Lower layer 6: Core wire 7: Loop

Claims (5)

An industrial woven fabric used in processes involving the extraction of water from moist paper materials.
A warp having a first warp which is arranged in two layers, an upper layer and a lower layer and is made of a monofilament or a monofilament twisted yarn, and a second warp which is thicker than the first warp and is made of a twisted yarn containing a multifilament.
Arranged in one layer, it has a monofilament or a warp and weft made of monofilament twisted yarn.
The warp and weft are entwined with the first warp and the second warp in the same pattern for each set, with two adjacent threads as a set.
In each of the upper layer and the lower layer, a predetermined number of the first warp threads and a predetermined number of the second warp threads are alternately arranged.
An industrial woven fabric characterized in that the first warp threads and the second warp threads do not overlap each other vertically. The industrial woven fabric is a bag-shaped woven fabric that is endless in the warp direction.
The first warp moves between the upper layer and the lower layer by folding back at a core wire extending in the weft direction to form a loop.
The second warp moves between the upper layer and the lower layer before and after the warp direction of the core wire without forming the loop.
The second warp that moves between the upper layer and the lower layer in front of the core wire and the second warp that moves between the upper layer and the lower layer behind the core wire alternate with each predetermined number. The industrial woven fabric according to claim 1, wherein the woven fabric is arranged. The industrial woven fabric according to claim 1 or 2, wherein one first warp and one second warp are alternately arranged in each of the upper layer and the lower layer. The first warp and the second warp overlap each other up and down, and
In the pattern, a set of warps is placed above one warp in the upper layer, between one warp in the upper layer and one warp in the lower layer, and one warp in the lower layer. The industrial woven fabric according to claim 3, wherein the woven fabric is formed by passing one warp of the upper layer and one warp of the lower layer in this order. The first warp consists of 4 to 6 twisted yarns of a monofilament having a diameter of 0.4 mm to 0.65 mm or a monofilament each having a diameter of 0.18 mm to 0.28 mm.
The second warp is according to any one of claims 1 to 4, wherein the second warp contains a multifilament having a thickness of 5d to 50d, and is composed of a twisted yarn having a thickness of 3000d to 6000d as a whole. Industrial textiles.

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