JP2021088794A - Seam felt for paper making - Google Patents

Abstract

To provide a seam felt for paper making improved in durability.SOLUTION: A base fabric 2 of a felt 1 for paper making includes: a ground weft 8; a ground warp 9 including an upper stage part 10 weaved into the ground weft 8 by a paper making face side, and an intermediate stage part 11 weaved into the ground weft 8 by a running face side to form a loop 6 by folding back; and an additional warp 12 weaved into the ground weft 8 by a more running face side than the upper stage part 10. A time number and a yearn number weaved so that the additional warp 12 passes through a paper making face side to the ground weft 8 is half or less of a time number and a yearn number weaved so that the intermediate stage part 11 composed of the ground warp 9 passes through a paper making face side to the ground weft 8, and the additional warp 12 composes a lower stage part. The additional warp 12 is thicker than the ground warp 9.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to papermaking seam felts that include loops formed at both ends to be connected to each other.

Paper felt is a press part that mechanically squeezes water from wet paper in a paper machine, pulp machine, etc., and is used for transporting and squeezing wet paper. The felt for papermaking is formed by kneading a base fabric in which warp and weft are woven together and a butt fiber layer made of short fibers by needling. Paper felt has wet paper transportability, water squeezing, surface property that does not mark the surface of the paper (paper surface property), initial familiarity with respect to the time from mounting on the device to a favorable state, and antifouling property. , And durability are required.

In order to improve workability when attaching felt to a paper machine, so-called seam felt is widely used, in which endless felt is pulled into the running path of felt, so-called felt run, and both ends are connected to each other to make it endless. It is widespread. In this type of seam felt, loops formed at both ends in the warp direction by folding back the warp threads constituting the base fabric are alternately arranged so that the loop holes are aligned with each other, and the core wires are passed through the loop holes to connect both ends. The configuration is common.

Increasing the amount of felt voids improves water squeezing. In order to increase the amount of voids in the seam felt, a seam base cloth for papermaking in which a second base cloth layer is provided on the papermaking surface side of the first base cloth layer in addition to the first base cloth layer including a loop is known. ing.

Patent Document 1 discloses a base cloth 100a as shown in FIG. 4 (A). The base cloth 100a includes a first base cloth layer 101 and a second base cloth layer 102a. The first base cloth layer 101 and the second base cloth layer 102a are laminate-type base cloth layers that are not bonded by weaving (do not have a binding thread), and are bonded together with the butt fiber layer by a needle. .. The first base fabric layer 101 includes warp threads 103 and weft threads 104 woven together, and the warp threads 103 are folded back at both ends in the length direction to form a loop 105. The loops 105 at both ends are aligned with each other and the core wire 106 is passed through the loop 105 to form an endless shape. The second base fabric layer 102a includes warp threads 107a and weft threads 108a woven into each other, does not have a loop 105, and is cut at a seam portion.

Patent Document 2 discloses a base cloth 100b as shown in FIG. 4 (B). The base cloth 100b includes a first base cloth layer 101 and a second base cloth layer 102b. The second base fabric layer 102b includes warp threads 107b and weft threads 108b woven into each other, does not have a loop 105, and is cut at a seam portion. The warp 107b weaves the weft 104 of the first base cloth layer 101, so that the second base cloth layer 102b is connected to the first base cloth layer 101.

A base cloth 100c as shown in FIG. 4C has been proposed. The base cloth 100c includes a first base cloth layer 101 and a second base cloth layer 102c. The second base fabric layer 102c contains warp threads 107c and weft threads 108c woven together, does not have a loop 105, and is cut at a seam portion. The end of the warp 107c located at the seam has loops at both ends, but the loops at both ends are not connected to each other through the core wire.

Patent Document 3 discloses a base cloth 100d as shown in FIG. 4 (D). The base cloth 100d includes a first base cloth layer 101 and a second base cloth layer 102d. The second base fabric layer 102d contains only the warp 107d. The warp 107d weaves the weft 104 of the first base cloth layer 101, so that the second base cloth layer 102d is connected to the first base cloth layer 101.

Further, the base fabrics 100e and 100f as shown in FIGS. 4 (E) and 4 (F) are actually used. In the base cloth 100e shown in FIG. 4 (E), the second base cloth layer 102e is composed only of the non-woven fabric base cloth (the wefts 108e are arranged in the weft direction and integrated by using the molten butt layer). In the base cloth 100f shown in FIG. 4 (F), the second base cloth layer 102f is a non-woven fabric base cloth (warp threads 107f are arranged in the warp direction and integrated using a molten butt layer). It is a base cloth layer composed of only the modified warp 107f). The first base fabric layer 101 and the second base fabric layers 102e and 102f are laminated type base fabric layers, and are bonded together with the butt fiber layer by a needle (the weft yarn 108e and the warp yarn 107f are the first base fabric layer). The second base cloth layers 102e and 102f are not connected to the first base cloth layer 101 without weaving the weft 104 of 101). Further, the first base cloth layer 101 and the second base cloth layers 102e and 102f are also used in a form in which they are used upside down.

Japanese Unexamined Patent Publication No. 11-100787 Special Table 2004-571226 Gazette Japanese Unexamined Patent Publication No. 2010-14917

The running surface side of the seam felt wears over time due to contact with a paper machine or the like. In particular, wear on the running surface side of the loop greatly affects the durability of the seam felt. An object of the present invention is to provide a seam felt for papermaking, which has improved durability by suppressing loop wear.

In one embodiment of the present invention, a base cloth (2) having loops (6) formed at both ends so as to be connected to each other and a butt layer (3) integrated with the base cloth (2) are formed. The papermaking seam felt (1) is provided, and the base cloth (2) is folded back to form the ground weft (8) and the loop (6), and the ground weft (8) is provided on the papermaking surface side. The ground warp yarn (9) including the upper step portion (10) woven into the ground weft portion (10) and the middle step portion (11) woven into the ground weft yarn (8, 8b) on the running surface side, and the ground weft yarn (8) on the running surface side. An additional warp (12) including a lower portion woven into (8, 8b) is provided so that each of the additional warp (12) passes through the papermaking surface side with respect to the ground weft (8, 8b) in a complete structure. The number and number of weaving is less than half of the number and number of weaving so that each of the middle steps (11) passes through the papermaking surface side with respect to the ground weft (8, 8b), and the additional warp (12) is , It is characterized in that it is thicker than the ground warp (9).

According to this configuration, most of the additional warp threads are arranged on the running surface side of the middle step portion, and the threads that wear over time due to contact with a paper machine or the like become thick additional warp threads, and the middle step portion and the loop run. Since wear on the surface side is suppressed, it is possible to provide a seam felt for papermaking with improved durability.

In the papermaking seam felt (1) according to an embodiment of the present invention, the ground weft threads (8) and the ground weft threads (8) and the above-mentioned ground weft threads are alternately woven into the upper and middle steps in the above configuration. It is characterized in that the ground warp yarn (9) forms a double weave structure.

According to this configuration, since the density of the ground weft and the ground warp is high as compared with the single weave, the elongation is small, the dimensional stability is high, and the rigidity is improved. Further, since the ground weft thread connects the upper and middle steps, it is possible to prevent the upper and middle steps from being displaced from each other in the length direction during needling.

In the papermaking seam felt (1) according to an embodiment of the present invention, in the first configuration, the ground weft (8) is woven into the upper portion (10), and the upper ground weft (8a) and the above. By including the base weft (8b) woven into the middle portion (11), a laminated structure in which two single-layer weave structures are overlapped with each other is formed.

According to this configuration, the amount of voids in the felt increases due to the increase in the number of ground weft threads.

In any of the above configurations, the papermaking seam felt (1) according to an embodiment of the present invention has the thickness of the additional warp (12) 1.02 times or more the thickness of the ground warp (9). It is characterized by being 1.5 times or less.

Durability is improved when the thickness of the additional warp is 1.02 times or more the thickness of the ground warp, and the thickness of the additional warp is 1.5 times or less the thickness of the ground warp. A gap in the base cloth is secured to suppress a decrease in water squeezing.

In the papermaking seam felt (1) according to an embodiment of the present invention, in the above configuration, the ground warp yarn (9) is composed of a monofilament having a thickness of 0.3 mm or more and 0.55 mm or less, and the additional warp yarn. (12) was composed of a twisted yarn obtained by twisting 30 or less and 3 or more monofilaments having a diameter of 0.08 mm or more and 0.22 mm or less, or a multifilament twisted yarn composed of three upper twists. It is characterized by.

According to this configuration, excessive flattening of the additional warp threads is suppressed, so that the decrease in the amount of voids is suppressed. Further, it becomes easy to adjust the thickness of the additional warp yarn to 1.02 times or more and 1.5 times or less with respect to the ground warp yarn while exerting these effects.

In any of the above configurations, the papermaking seam felt (1) according to an embodiment of the present invention has the ground warp yarn (9) and the middle stage portion (11) constituting the upper stage portion (10) in the complete structure. The number of the ground warp threads (9) constituting the above-mentioned ground warp threads (9) and the number of the additional warp threads (12) constituting the lower stage portion (12) are equal to each other.

According to this configuration, since the number of the lower portion composed of the additional warp yarns is equal to the number of the ground warp yarns of the upper stage portion and the middle stage portion, the amount of voids can be increased.

According to the present invention, it is possible to provide a papermaking seam felt having improved durability by suppressing loop wear.

Schematic sectional view of the seam portion of the papermaking seam felt according to the embodiment in the longitudinal direction. Schematic cross-sectional view in the weft direction of the base fabric according to the embodiment and its modified example (A: embodiment, B: modified example) Explanatory drawing which shows the manufacturing method of the base cloth which concerns on embodiment Schematic cross-sectional view of the seam portion of the base fabric according to the prior art

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a cross section (cross section orthogonal to the weft direction) of the seam portion of the papermaking seam felt (hereinafter, simply referred to as “felt”) 1 according to the embodiment. The felt 1 includes a base cloth 2 and a butt layer 3 formed by laminating short fibers on the papermaking surface side and the running surface side of the base cloth 2 and integrating them by needling. The felt 1 has an endless shape in the length direction (machine direction, warp direction) and is attached to a paper machine. The outside side is the papermaking surface side on which the wet paper is placed, and the inside side is the running surface side. Further, in the following description, the thickness direction of the felt 1 and the base cloth 2 is the vertical direction, the papermaking surface side is referred to as "upper", and the traveling surface side is referred to as "lower".

FIG. 2A shows a cross section of the base cloth 2 according to the embodiment in the weft direction (cross section orthogonal to the warp direction). As shown in FIGS. 1 and 2 (A), the base cloth 2 has loops 6 at both ends in the length direction. After pulling the felt 1 into the felt run, the loops 6 at both ends of the base cloth 2 are alternately arranged so as to be aligned with each other, and the core wire 7 is passed through the loop 6 to connect both ends to the felt. 1 becomes endless.

The base cloth 2 includes a ground weft thread 8 extending in the width direction of the felt 1 (machine orthogonal direction, weft direction) and a ground warp thread 9 woven into the ground weft thread 8 and extending in the length direction of the felt 1. The ground warp thread 9 includes an upper step portion 10 woven into the ground weft thread 8 on the papermaking surface side and a middle step portion 11 woven into the ground weft thread 8 on the running surface side. The boundary portion between the upper step portion 10 and the middle step portion 11 of the ground warp thread 9 is folded back to form a loop 6.

The ground weft threads 8 and the ground warp threads 9 form a double weave structure by alternately weaving the ground weft threads 8 into the upper step portion 10 and the middle step portion 11. Here, the fact that the ground weft 8 is woven alternately into the upper portion 10 and the middle stage 11 means that the ground weft 8 passes over one or a plurality of continuous upper portions 10 once or a plurality of times. It means that passing under one or a plurality of continuous middle portions 11 once or a plurality of times alternately appears.

FIG. 2B shows a cross section of the base cloth 2 according to the modified example in the weft direction (cross section orthogonal to the warp direction). The longitudinal cross section of the modified example is the same as that of FIG. 1 except for the reference numerals (in FIG. 1, the reference numerals in parentheses are the reference numerals of the modified examples, and the reference numerals without the reference numerals in parentheses are shown. It is a common reference numeral in the embodiment and the modification). In the modified example shown in FIG. 2B, the two single weave structures overlap each other by including the upper ground weft 8a woven into the upper portion 10 and the base weft 8b woven into the middle portion 11. A laminated structure is formed. In the figure, the structure formed by the ground weft thread 8 and the ground warp thread 9 is a laminated structure, the upper ground weft thread 8a and the upper step portion 10 are woven in a plain weave, and the base weft thread 8b and the middle step portion 11 are woven in a plain weave. Although the case where it is woven is shown, it may be woven with a structure other than plain weave.

As shown in FIGS. 1 and 2, the base cloth 2 has a ground weft 8 (when the layer composed of the ground weft 8 and the ground warp 9 has a double weave structure) or a base weft 8b (ground weft) on the running surface side. Further includes an additional warp 12 woven into the layer (when the layer composed of 8 and the ground warp 9 is a laminated structure). The additional warp 12 does not form a connecting loop 6 and is cut at the seam.

The complete structure is the smallest unit of the basic structure of the woven fabric, and the woven fabric is woven by repeating the complete structure in the length direction and the width direction. In the complete structure, the number of times the ground weft 8 is woven so that the additional warp 12 passes over the ground weft 8 and the number of the ground weft 8 woven are such that the ground weft 8 is woven so that the middle stage portion 11 passes over the ground weft 8. It is less than half the number of times of weaving and the number of ground wefts 8 to be woven. Therefore, in the thickness direction of the base cloth 2, the additional warp threads 12 have more portions located on the running surface side than the middle step portion 11, and form the lower step portion of the warp threads. Here, the middle stage portion 11 and the additional warp yarn 12 may pass over a plurality of continuous ground weft yarns 8 in a section passing over the ground weft yarn 8.

The complete structure of the base cloth 2 according to the embodiment includes eight ground weft threads 8, an upper step portion 10 composed of eight ground warp threads 9, a middle step portion 11 composed of eight ground warp threads 9, and eight additional threads. It is composed of warp threads 12. The ground weft 8 is between one set of upper part 10 and middle part 11, above one upper part 10, between one set of upper part 10 and middle part 11, under the additional warp thread 12, and one set of upper part. It is arranged so as to pass in order between the portion 10 and the middle stage portion 11, above one upper stage portion 10, between one set of upper stage portion 10 and the middle stage portion 11, and between one set of middle stage portion 11 and the additional warp yarn 12. To. Therefore, in the present embodiment, in the complete structure, the middle stage portion 11 passes over one ground weft thread 8 twice, while the additional warp thread 12 passes over one ground weft thread 8 once. ing. Further, in the portion of the ground weft thread 8 where the additional warp thread 12 passes above, the middle step portion 11 also passes over the portion. As described above, the number of times the additional warp thread 12 weaves the ground weft thread 8 is less than half the number of times the middle step portion 11 weaves the ground weft thread 8, and the number of the ground weft threads 8 woven into the additional warp thread 12 is the number of times the ground weft thread 8 is woven into the middle step portion 11. It is less than half the number of woven ground weft threads 8. The structure of the complete structure is not limited to the above structure, but it is preferable that the number of the upper portion 10, the middle stage portion 11 and the additional warp threads 12 (lower stage portion) in the complete structure is equal to each other.

The complete structure of the base cloth 2 according to the modified example is composed of four upper ground wefts 8a, four base wefts 8b, an upper portion 10 composed of four ground warp threads 9, and four ground warp threads 9. It is composed of a middle section 11 and four additional warp threads 12. The upper weft 8a is woven into the upper portion 10 in a plain weave, and the base weft 8b is placed between the upper portion 10 and the middle portion 11 of one set, under one additional warp thread 12, and with the upper portion 10 of one set. It is arranged so as to pass in order between the middle stage portion 11 and the pair of middle stage portions 11 and the additional warp threads 12.

As a material for the core wire 7, the ground weft thread 8, the ground warp thread 9, and the additional warp thread 12, for example, a synthetic resin such as nylon, polyamide, polyester, polyethylene, polypropylene, or polyvinyl chloride can be used. The core wire 7 is preferably 5 to 10 twisted yarns of these material yarns. The ground weft 8 is preferably a monofilament having a thickness of 0.3 mm or more and 0.55 mm or less, and has about 11 or more and about 24 or less (30 or more and 60 or less per inch) per 1 cm in the length direction. Be placed. The ground warp yarn 9 is preferably a monofilament having a thickness of 0.3 mm or more and 0.55 mm or less, and has about 15 or more and about 24 or less per cm in the width direction (40 or more and 60 or less per inch). Be placed.

The additional warp thread 12 constituting the lower step portion is thicker than the ground warp thread 9 including the upper step portion 10 and the middle step portion 11. Preferably, the thickness of the additional warp thread 12 is 1.02 times or more and 1.5 times or less the thickness of the ground warp thread 9. The additional warp yarn 12 is preferably a twisted yarn, and more preferably 30 or less and 3 or more monofilaments having a diameter of 0.08 mm or more and 0.22 mm or less (the smaller the yarn diameter of the monofilament, the larger the number of yarns). It is a twisted yarn twisted with a large diameter (the number is small when the diameter is large), or a multifilament twisted yarn composed of three upper twists. For example, the additional warp 12 is a 3/10/8 yarn (10 monofilaments are twisted, and 10 lower-twisted twisted yarns are further twisted (twisted in the opposite direction and upward-twisted). Twisted yarn), 3/8/10 yarn, or 3/6/12 yarn. Further, for example, the additional warp yarn 12 is a 3/20 yarn (a single-twisted yarn in which three 20 monofilaments are twisted (a yarn in which three untwisted 20 monofilaments are collected and twisted in one direction). ). Further, for example, the additional warp yarn 12 is a multi-twisted yarn obtained by further twisting three multifilament yarns obtained by twisting several to several tens of yarns downward.

FIG. 3 shows a method of manufacturing the base cloth 2. The base cloth 2 is woven by bag weaving. That is, the base cloth 2 is woven using the ground weft yarn 8 as the warp yarn and the ground warp yarn 9 and the additional warp yarn 12 as the driving yarn. One ear thread 13 (core wire for weaving) is arranged in parallel with the ground weft thread 8 which is a warping thread. The shuttle thread 9 is woven into the ground weft thread 8 by rotating the shuttle (not shown) attached to the ground warp thread 9 while folding it back at the ear thread 13. Further, the additional warp thread 12 is woven into the ground weft thread 8 by rotating the shuttle (not shown) attached to the additional warp thread 12 on the outside of the ground warp thread 9. Felt 1 (see FIG. 1) is manufactured by integrating the butt layer 3 (see FIG. 1) made of short fibers laminated with the base cloth 2 by needling. The additional warp 12 is cut at the seam before or after needling. The felt 1 is used with the front and back sides reversed from those at the time of manufacturing the base cloth 2.

The action and effect of the base cloth 2 according to the embodiment and the modified example shown in FIGS. 1 and 2 will be described in comparison with the base cloth 100a, b, c, d, e, f according to the prior art described in FIG. ..

Since the base cloth 2 includes not only the ground weft yarn 8 and the ground warp yarn 9 but also the additional warp yarn 12, the amount of voids in the felt 1 is increased and the water squeezing is improved as compared with the case where the additional warp yarn 12 is not provided.

The number and number of times and the number of additional warp threads 12 woven so as to pass above the ground weft thread 8 of the base cloth 2 are less than half the number and number of times the additional warp threads 12 are woven so as to pass above the ground weft thread 8. Therefore, most of the additional warp threads 12 are located below the middle stage portion 11. Therefore, the yarn that wears with the usage time due to contact with the paper machine is mainly the additional warp yarn 12. Since the additional warp yarn 12 to be worn is thicker than the ground warp yarn 9, the durability of the base cloth 2 is improved. In the base fabrics 100a, b, c, d, e, and f according to the prior art shown in FIG. 4, the lower side of the loop 105 is particularly prone to wear, and this wear greatly affects the product life of the felt 1. In the base cloth 2 according to the modified example, the wear on the lower side of the loop 6 is prevented by the additional warp thread 12, so that the durability is greatly improved. In particular, when the thickness of the additional warp 12 is 1.02 times or more the thickness of the ground warp 9, the durability is improved, and the thickness of the additional warp 12 is 1.5 times or less the thickness of the ground warp 9. In the case of, since the gap between the additional warp threads 12 is secured, the durability can be improved without significantly reducing the water squeezing.

Further, in the base cloths 100e and f according to the prior art shown in FIG. 4, when the second base cloth layers 102e and f are arranged under the first base cloth layer 101, the second base cloth layers 102e and f may be formed on the second base cloth layers 102e and f. Since the welding bat is used to greatly hinder water squeezing and the weft 108e or warp 107f is in a free state, the entanglement is poor and the wear suppressing effect is lowered. On the other hand, in the base cloth 2 according to the embodiment, since it is not necessary to use a welding bat, water squeezing is not hindered, and since the additional warp yarn 12 is woven into the ground weft yarn 8, a high wear suppressing effect is exhibited.

Further, since the portion of the additional warp threads 12 constituting the lower step portion passing under the ground weft thread 8 is longer than the portion passing under the ground weft thread 8 in the middle step portion 11, compared with the case where the additional warp threads 12 are not provided. Vibration is suppressed.

In the base fabrics 100a, b, c, d, e, and f according to the prior art, the warp 107 and / or the weft 108 arranged on the papermaking surface side is thinner than the warp 103 and the weft 104 arranged on the running surface side. By doing so, the paper quality was improved. However, in the seam part, the paper manufactured has a mark. This is because the gap at the cut end of the warp 107 cut at the seam portion becomes a mark. In the base cloth 2 according to the embodiment and the modified example, even if another layer is added to the papermaking surface side of the layer composed of the ground weft thread 8 and the ground warp thread 9, the paper surface property of the seam portion cannot be sufficiently improved. 12 is provided on the running surface side of the layer composed of the ground weft thread 8 and the ground warp thread 9 to improve durability.

When the second base cloth layers 102a, b, c include both the warp threads 107a, b, c and the weft threads 108a, b, c as in the base cloths 100a, b, c according to the prior art, the basis weight (per unit area). Weight) increases. Further, since the base fabrics 100e and f according to the prior art use a welding bat, the basis weight is increased. Since the product price of felt 1 is set based on the basis weight in business practice, the consumer wants to reduce the basis weight of felt 1. In the felt provided with the base fabrics 100a, b, c, e and f, it is necessary to reduce the amount of the bat used in order to suppress the increase in the basis weight. On the other hand, in the base fabric 2 according to the embodiment and the modified example, since only the additional warp 12 increases the weight with respect to the layer composed of the ground weft thread 8 and the ground warp thread 9, the increase in the basis weight is suppressed. Will be done.

In the base fabrics 100a, c, e, f according to the prior art, since the second base fabric layers 102a, c, e, f are not connected to the first base fabric layer 101, the first base fabric is used during needling. The layer 101 and the second base cloth layers 102a, c, e, and f are displaced from each other in the length direction. In the base cloth 2 according to the embodiment, the additional warp yarn 12 is woven into the ground weft yarn 8. Therefore, it is possible to prevent the layer composed of the ground weft yarn 8 and the ground warp yarn 9 and the additional warp yarn 12 from being displaced from each other in the length direction during needling. Further, in the base cloth 100e according to the prior art, the weft 108e is easily frayed at the seam portion, and in the base cloth 100f, the warp 107f is easily pulled out, but in the base cloth 2 according to the embodiment, the additional warp 12 woven into the ground weft 8 is used. Since it is used, these problems are unlikely to occur.

Since the additional warp yarn 12 is composed of twisted yarns, the butt layer 3 is entangled with the base fabric 2 better.

When a monofilament having a thickness of 0.3 mm or more and 0.55 mm or less is used as the ground warp thread 9, 30 or less and 3 or more monofilaments having a diameter of 0.08 mm or more and 0.22 mm or less are used as the additional warp thread 12. The thickness of the additional warp 12 can be adjusted to 1.02 times or more and 1.5 times or less the thickness of the ground warp 9 by using the twisted yarn twisted in or a multifilament twisted yarn consisting of three upper twists. It's easy to do. Further, by using such a twisted yarn as the additional warp 12, it is possible to prevent the additional warp 12 from being excessively flattened and the amount of voids being reduced.

When the layer composed of the ground weft 8 and the ground warp 9 is formed into a double weave structure as in the base cloth 2 according to the embodiment, the density of the ground weft 8 and the ground warp 9 is higher than that of the single weave. The elongation is small, the dimensional stability is high, the rigidity is improved, and since the ground weft thread 8 connects the upper portion 10 and the middle stage portion 11, the upper stage portion 10 and the middle stage portion 11 are displaced from each other in the length direction during needling. Can be suppressed. Further, when the layer composed of the ground weft yarn 8 and the ground warp yarn 9 is formed into a laminated structure of two single woven structures as in the base cloth 2 according to the modified example, the amount of the ground weft yarn 8 increases and the amount of voids increases. ..

In the complete structure, the number of additional warp threads 12 constituting the lower stage portion is equal to the number of the upper stage portion 10 and the middle stage portion 11, so that the amount of voids increases.

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, the felt 1 may be used not in a paper machine but in another paper making machine such as a pulp machine.

1: Paper seam felt 2: Base cloth 6: Loop 7: Core wire 8: Ground weft 8a: Upper ground weft 8b: Base weft 9: Ground warp 10: Upper 11: Middle 12: Additional warp

Claims (6)

A papermaking seam felt comprising a base fabric having loops formed at both ends so as to be connected to each other and a butt layer integrated with the base fabric.
The base cloth is
With the ground weft
A ground warp yarn that is folded back to form the loop and includes an upper stage portion that is woven into the ground weft yarn on the papermaking surface side and a middle stage portion that is woven into the ground weft yarn on the running surface side.
An additional warp yarn including a lower part woven into the ground weft yarn on the running surface side is provided.
In the complete structure, the number and number of times each additional warp is woven so as to pass through the papermaking surface side with respect to the ground weft is the number of times each middle step is woven so as to pass through the papermaking surface side with respect to the ground weft. And less than half of the number
The additional warp is a seam felt for papermaking, which is thicker than the ground warp. The papermaking according to claim 1, wherein the ground weft and the ground warp form a double weave structure by alternately weaving the ground weft and the middle stage. For seam felt. By including the upper ground weft that is woven into the upper part and the base weft that is woven into the middle part, the ground weft forms a laminated structure in which the two single weave structures are overlapped with each other. The seam felt for papermaking according to claim 1. The seam felt for papermaking according to any one of claims 1 to 3, wherein the thickness of the additional warp is 1.02 times or more and 1.5 times or less the thickness of the ground warp. The ground warp yarn is composed of a monofilament having a thickness of 0.3 mm or more and 0.55 mm or less.
The additional warp was composed of a twisted yarn obtained by twisting 30 or less and 3 or more monofilaments having a diameter of 0.08 mm or more and 0.22 mm or less, or a multifilament twisted yarn composed of three upper twists. The seam felt for papermaking according to claim 4. Claims 1 to 5 are characterized in that, in the complete structure, the number of the ground warp yarns constituting the upper portion, the ground warp yarns constituting the middle stage portion, and the additional warp yarns constituting the lower stage portion are equal to each other. The seam felt for papermaking according to any one of the above.

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