JP7365214B2 - seam felt for paper making - Google Patents

Description

The present disclosure relates to a papermaking seam felt that includes loops formed at both ends to be connected to each other.

Papermaking felt is a press part for mechanically squeezing out water from wet paper in paper machines, pulp machines, etc., and is used for transporting and squeezing water from wet paper. Papermaking felt is formed by integrating a base fabric in which warps and wefts are woven together and a batt fiber layer made of staple fibers by needling. Paper-making felt has several characteristics: wet paper transportability, water squeezing ability, surface properties that do not leave marks on the paper surface (paper surface properties), initial conformability regarding the time from when it is attached to equipment until it reaches a desirable state, and stain resistance. , and durability are required.

In order to improve the work efficiency when attaching felt to a paper machine, so-called seam felt is widely used, which is made by drawing an end of felt into a felt running path, or so-called felt run, and then connecting both ends to make it endless. It is widespread. In this type of seam felt, the loops formed at both ends in the warp direction by folding back the warp yarns that make up the base fabric are arranged alternately so that the loop holes are aligned with each other, and the core wire is passed through the loop holes to connect both ends. This is a common configuration.

When the amount of voids in the felt increases, water squeezing performance improves. In order to increase the amount of voids in the seam felt, a seam base fabric for papermaking felt is known in which, in addition to a first base fabric layer including loops, a second base fabric layer is provided on the papermaking side of the first base fabric layer. ing.

Patent Document 1 discloses a base fabric 100a as shown in FIG. 4(A). The base fabric 100a includes a first base fabric layer 101a and a second base fabric layer 102. The first base fabric layer 101a and the second base fabric layer 102 are laminate type base fabric layers that are not bonded by weaving (does not have binding threads), and are bonded together with the batt fiber layer using needles. . The second base fabric layer 102 includes a warp 103 and a weft 104 interwoven with each other, and a loop 105 is formed by folding back the warp 103 at both ends in the length direction. By aligning the loops 105 at both ends with each other and passing the core wire 106 through the loops 105, it becomes endless. The first base fabric layer 101a includes warp yarns 107a and weft yarns 108a interwoven with each other, has no loops 105, and is cut at the seam portion.

Furthermore, a base fabric 100b as shown in FIG. 4(B) has been proposed. The base fabric 100b includes a first base fabric layer 101b and a second base fabric layer 102. The first base fabric layer 101b includes warp yarns 107b and weft yarns 108b interwoven with each other, has no loops 105, and is cut at the seam portion. The ends of the warp threads 107b located at the seam portion are tufted.

Further, a base fabric 100c as shown in FIG. 4(C) is actually used. In the base fabric 100c shown in FIG. 4(C), the first base fabric layer 101c is a non-woven base fabric consisting only of warp yarns 107c (the warp yarns 107c do not incorporate the weft yarns 104 of the second base fabric layer 102, and The fabric layer 101c is not connected to the second base fabric layer 102). Furthermore, a configuration in which the first base fabric layer 101c and the second base fabric layer 102 are used upside down is also used.

Japanese Patent Application Publication No. 11-100787

In the base fabrics 100a, b, c of the papermaking seam felt according to the above-mentioned prior art, since the first base fabric layers 101a, b, c and the second base fabric layer 102 are not connected to each other, both layers are woven together. That was difficult. Furthermore, if the two layers were woven separately and then stacked on top of each other, it was difficult to match the lengths of the two layers, uneven tension occurred, and wrinkles and blisters were likely to occur during use. When the first base fabric layer 101c, which does not contain weft yarns, as shown in FIG. 4(C) is used, there is a risk that the warp yarns 107c will come off, and they will not be entangled with the batt layer. Furthermore, although not shown in the drawings, if connecting loops were provided on both layers of the base fabric, it would be difficult to align the upper and lower seams, making it difficult to reduce marks.

In view of these problems, an object of the present invention is to provide a seam felt for paper making that increases the amount of voids in the felt and is easy to manufacture.

An embodiment of the present invention comprises a base fabric (2) having loops (4) formed at both ends to be connected to each other, and a batt layer (3) integrated with the base fabric (2). A papermaking seam felt (1) comprising: the base fabric (2) being folded back at the seam part to form the loop (4), and forming an upper part (9) and a part from the upper part (9). The first warp (5) is located in the middle section (10), which is located on the running surface side, and the second warp (6) is located in the lower section, which is located closer to the running surface than the middle section (10). ), the first weft (7) woven into the upper section (9) to form a single layer weave (11), and the middle section (10) and the and a second weft (8) woven into the lower part , and the complete structure of the base fabric consists of only the first warp, the second warp, the first weft, and the second weft. do. The second warp yarns may be twisted yarns that terminate at the seam portion.

According to this configuration, the void volume of the felt is increased by the single-ply weave and the warp double-ply weave including both warp and weft, and since the single-ply weave and the warp double-ply weave are connected to each other by a loop, both the warp and weft wefts are can be woven together, making it easier to manufacture the base fabric.

In the papermaking seam felt (1) according to an embodiment of the present invention, in the above configuration, the first warp (5), the first weft (7), and the second weft (8) are made of monofilament, The second warp (6) is characterized by being made of twisted yarn.

According to this configuration, the dimensions of the base fabric are stabilized because the first warp, the first weft, and the second weft are made of monofilaments, and the second warp is prevented from coming off because the second warp is made of twisted yarn. This also improves the entanglement of the batt layer.

In the seam base fabric (2) for papermaking felt according to an embodiment of the present invention, in the above configuration, the second warp (6) includes 30 or less monofilaments having a diameter of 0.08 mm or more and 0.22 mm or less. It is characterized by being composed of a twisted yarn consisting of three or more twisted yarns, or a multifilament twisted yarn consisting of three twisted yarns.

According to this configuration, the second warp is prevented from being excessively flattened, and therefore, the amount of voids is prevented from decreasing.

The seam base fabric (2) for papermaking felt according to an embodiment of the present invention has any of the above configurations, and in a complete structure, the first warp (5) constituting the upper section (9), the middle section (10) The number of the first warp yarns (5) constituting the warp and the second warp yarns (6) constituting the lower section are equal to each other.

According to this configuration, the number of the second warp threads in the lower part is equal to the number of first warp threads in the upper part and the middle part, so it is possible to increase the amount of voids.

According to the present invention, it is possible to provide a seam base fabric for papermaking felt that increases the amount of voids in the felt and is easy to manufacture.

A schematic cross-sectional view in the warp direction of a seam portion of a papermaking seam felt according to an embodiment. A schematic cross-sectional view in the weft direction of the base fabric according to the embodiment and its modification example Explanatory diagram showing a method for manufacturing a base fabric according to an embodiment A schematic cross-sectional view of a seam portion of a base fabric according to conventional technology

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a longitudinal section (a section perpendicular to the latitudinal direction) of a seam portion of a papermaking seam felt (hereinafter simply referred to as "felt") 1 according to an embodiment. The felt 1 includes a base fabric 2 and a batt layer 3 formed by laminating short fibers on the paper-making surface side and the running surface side of the base fabric 2 and integrating them by needling. The felt 1 is endless in the length direction (machine direction, warp direction) and attached to a paper machine, with the outside serving as the papermaking surface on which the wet paper is placed, and the inside serving as the running surface. In addition, in the following description, the thickness direction of the felt 1 and the base fabric 2 is referred to as an up-down direction, the paper-making surface side is referred to as "upper", and the running surface side is referred to as "lower".

FIG. 2 shows a cross section in the latitudinal direction (a cross section perpendicular to the longitudinal direction) of the base fabric 2 according to the embodiment. As shown in FIGS. 1 and 2, the base fabric 2 has a first warp 5 that extends in the warp direction and is folded back to form a loop 4, and a first warp 5 that is arranged closer to the running surface than the first warp 5. A second warp 6 extending in the warp direction, a first weft 7 extending in the weft direction (width direction of the felt 1, orthogonal direction to the machine), and a first weft 7 disposed closer to the running surface than the first weft 7 in the weft direction. and a second weft 8 extending in the second direction.

The first warp yarns 5 include an upper section 9 disposed on the paper-making surface side, and a middle section 10 disposed closer to the running surface than the upper section 9. The loop 4 forms a boundary between the upper section 9 and the middle section 10. The second warp yarns 6 are arranged closer to the running surface than the middle section 10 and form a lower section.

The first weft 7 is woven into the upper part 9 of the first warp 5 in plain weave. A single layer structure 11 is formed by the upper part 9 of the first warp yarns 5 and the first weft yarns 7 that are interwoven with each other. Note that the single layer weave 11 may be a weave other than plain weave.

The second weft 8 is alternately woven into the middle section 10 and the lower section (second warp 6). Here, when the second weft 8 is woven alternately into the middle section 10 and the lower section, it means that the second weft 8 is woven once or twice between the upper section 9 and the middle section 10 of one set or a plurality of consecutive sets. This means that passing a plurality of times and passing under one or a plurality of consecutive lower parts one or more times appear alternately. In the illustrated example, the second weft 8 passes in order between the middle section 10 and the lower section, between the upper section 9 and the middle section 10, between the middle section 10 and the lower section, and under the lower section. It is woven into the middle section 10 of the first warp 5 and the second warp 6 so as to repeat this process. A warp double weave 12 is formed by the middle section 10, the lower section, and the second weft 8 that are interwoven with each other.

Therefore, the first warp threads 5 form a loop 4 between the upper section 9 forming the single-ply weave 11 and the middle section 10 forming the double-ply weave 12. The felt 1 is drawn into the felt run so that the single layer weave 11 is on the outside and the warp double layer 12 is on the inside, and then the loops 4 are arranged alternately so as to be aligned with each other, and the core wire 13 is placed inside the loop 4. By passing it through, both ends are connected and the felt 1 becomes endless. The second warp threads 6 do not form a loop 4 and are cut at the seam.

A complete weave is the smallest unit of the basic weave of a textile, and a textile is woven by repeating the complete weave in the length and width directions. The complete structure of the base fabric 2 consists of four upper sections 9 (first warps 5), four middle sections 10 (first warps 5), four lower sections (second warps 6), and four middle sections 10 (first warps 5). It is composed of a book first weft 7 and four second wefts 8. The complete weave of the base fabric 2 is not limited to the above configuration, but preferably, in the complete weave, the numbers of the upper section 9, the middle section 10, and the lower section are the same, and the numbers of the first weft 7 and the second weft 8 are the same. The numbers are the same.

As materials for the first warp 5, second warp 6, first weft 7, second weft 8, and core wire 13, for example, synthetic resins such as nylon, polyamide, polyester, polyethylene, polypropylene, and polyvinyl chloride can be used. The core wire 13 is preferably 5 to 10 strands of threads of these materials. The first warp yarns 5 are preferably monofilaments having a thickness of 0.3 mm or more and 0.55 mm or less, and about 15 or more and about 24 or less threads per 1 cm in the width direction (40 or more and 60 or less threads per inch). It will be placed in The first weft 7 and the second weft 8 are preferably monofilaments having a thickness of 0.3 mm or more and 0.55 mm or less, and have about 11 to about 24 threads per 1 cm (30 threads per inch) in the length direction. 60 or less).

The second warp 6 constituting the lower section has a thickness equal to or greater than the first warp 5, is preferably a twisted yarn, and is more preferably a monofilament having a diameter of 0.08 mm or more and 0.22 mm or less. A twisted yarn consisting of 30 or less and 3 or more (the smaller the monofilament diameter, the larger the number, and the larger the yarn diameter, the smaller the number), or a multifilament twisted yarn consisting of 3 ply-twisted yarns. For example, the second warp 6 is a 3/10/8 yarn (8 monofilaments are twisted into 10 yarns, and the 10 pre-twisted yarns are further twisted into 3 yarns (twisted in the opposite direction to create a final twist). ) plied yarn), 3/8/10 yarn, or 3/6/12 yarn. For example, the second warp 6 is a 3/20 yarn (a single-twisted yarn made by twisting three 20 monofilaments (a yarn made by collecting three untwisted 20 monofilaments and twisting them in one direction). )). Further, for example, the second warp yarns 6 are plied yarns obtained by further twisting three multifilament yarns, which are first twisted several to several dozen yarns.

FIG. 3 shows a method for manufacturing the base fabric 2. The base fabric 2 is woven using a hollow weave. That is, the base fabric 2 is woven by using the first weft 7 and the second weft 8 as regular warp yarns, and using the first warp 5 and second warp 6 as driving yarns. One selvage thread 14 (core wire for weaving) is arranged parallel to the first weft thread 7, which is a warp thread. The first warp threads 5 are woven into the first weft threads 7 and the second weft threads 8 by turning a shuttle (not shown) attached to the first warp threads 5 while turning them around the selvedge threads 14. Further, by making a shuttle (not shown) attached to the second warp threads 6 go around the outside of the first warp threads 5, the second warp threads 6 are woven into the second weft threads 8. A felt 1 (see FIG. 1) is manufactured by integrating a batt layer 3 (see FIG. 1) made of short fibers with a base fabric 2 by needling. The second warp threads 6 are cut at the seam before or after needling. The felt 1 is used with the front and back sides reversed when the base fabric 2 is manufactured.

The effects of the base fabric 2 according to the embodiment shown in FIGS. 1 and 2 will be explained in comparison with the base fabrics 100a, b, and c according to the prior art shown in FIG. 4.

The base fabric 100c according to the prior art has a small increase in the amount of voids because the first base fabric layer 101c does not contain wefts, but the base fabric 2 according to the embodiment has a single layer weave 11 and a warp double layer 12. Since the warp and the weft are included in both structures 11 and 12, the void volume of the felt 1 is increased to the same extent as the base fabrics 100a and 100b according to the prior art, and the water squeezing property is improved.

The base fabrics 100a, b according to the prior art are difficult to weave together because the first base fabric layers 101a, b and the second base fabric layer 102 are not connected to each other and tend to shift from each other. The base fabric 100c according to the prior art needs to be manufactured separately from the second base fabric layer 102 because the first base fabric layer 101c consists of only the warp yarns 107c. On the other hand, in the base fabric 2 according to the embodiment, the single-ply weave 11 and the warp double-ply weave 12 are connected to each other by the loops 4 and are difficult to shift from each other, so that they can be woven together as shown in FIG. 3, and manufacturing is easy. It's easy. Further, when the first base fabric layers 101a, b, c and the second base fabric layer 102 of the base fabrics 100a, b, c according to the prior art are created separately and then overlapped, the lengths of both layers can be matched. However, since the base fabric 2 according to the embodiment is woven together with the single layer weave 11 and the warp double layer weave 12, No problems will occur.

In the base fabrics 100a, b, and c according to the prior art, the lower side of the loop 105 in particular tends to wear out over time due to contact with the paper machine, and this wear greatly affects the product life of the felt 1. In the base fabric 2 according to the embodiment, the second warp threads 6 are present below the loops 4 to prevent wear on the lower side of the loops 4, so durability is greatly improved.

The base fabric 2 according to the embodiment has good surface properties because the single layer weave 11 disposed on the paper-making surface side is composed of a plain weave.

When the second warp threads 6 have a thickness equal to or greater than that of the first warp threads 5, abrasion resistance is improved. Further, since the second warp yarns 6 are made of twisted yarns, the batt layer 3 is well entangled with the base fabric 2. By using, as the second warp 6, a twisted yarn consisting of 30 or less but 3 or more monofilaments having a diameter of 0.08 mm or more and 0.22 mm or less, or a multifilament twisted yarn consisting of 3 ply-twisted yarns. , it is possible to suppress the second warp yarns 6 from being excessively flattened and the void amount to decrease. Dimensional stability is improved by using monofilament, which has less elasticity than twisted yarn, as the first warp 5, first weft 7, and second weft 8.

In the complete structure, the number of second warps 6 forming the lower section is equal to the number of first warps 5 forming the upper section 9 and the middle section 10, so the amount of voids increases.

Since the second warp 6 does not have loops 4 and the base fabric 2 has one row of loops 4, it is easier to connect the loops 4 than when there are two rows of loops 4 above and below. Marks are reduced.

Although the description of the specific embodiments has been completed above, the present invention is not limited to the above-mentioned embodiments and can be widely modified and implemented. For example, the felt 1 may be used not in a paper machine but in other paper making machines such as pulp machines.

1: Seam felt for papermaking 2: Base fabric 4: Loop 5: First warp 6: Second warp (lower section)
7: First weft 8: Second weft 9: Upper section 10: Middle section 11: 1 layer weave 12: Warp double layer weave

Claims (5)

A seam felt for papermaking, comprising a base fabric having loops formed at both ends to be connected to each other, and a batt layer integrated with the base fabric,
The base fabric is
a first warp that is folded back at a seam to form the loop and is located in an upper section and a middle section that is located closer to the running surface than the upper section;
a second warp located in a lower step portion that is located closer to the running surface than the middle step portion;
a first weft woven into the upper section to form a single layer weave;
a second weft woven into the middle section and the lower section to form a warp double weave ;
A seam felt for paper making, wherein the complete structure of the base fabric consists of only the first warp, the second warp, the first weft, and the second weft. The first warp, the first weft, and the second weft are made of monofilament,
The papermaking seam felt according to claim 1, wherein the second warp is made of twisted yarn. The second warp is composed of a twisted yarn consisting of three or more of 30 or less monofilaments having a diameter of 0.08 mm or more and 0.22 mm or less, or a multifilament twisted yarn consisting of three ply-twisted yarns. The seam felt for papermaking according to claim 2, characterized in that: Claim characterized in that, in the complete structure, the numbers of the first warp yarns constituting the upper stage section, the first warp yarns constituting the middle stage section, and the second warp threads constituting the lower stage section are equal to each other. Seam felt for papermaking according to any one of items 1 to 3. The seam felt for papermaking according to any one of claims 1 to 4, wherein the second warp is a twisted yarn that terminates at the seam portion.

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