JP2009019282A - Seam-having press felt for producing paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seam-having press felt used for producing paper, which is used in the press part of a paper machine and has a base fabric comprising a woven fabric integrally woven on the paper machine so that loops for joining ends to each other in a portion where a pair of warps are returned are formed to keep two base fabric layers formed of warps, overlapped in the thickness direction, overlapped in two layers, and which realizes excellent compression resistance and can be produced at a low cost without using a special loom. <P>SOLUTION: This seam-having press felt is characterized by having binding wefts 5a to 5h moved between two base fabric layers 11, 12 to bind the base fabric layers to each other, wherein the binding wefts are woven to form the base fabric layers, while changing positions at every plurality of laterally arranged wefts 3, 4. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  INDUSTRIAL APPLICABILITY The present invention is a base fabric that is used in a press part of a papermaking machine, and is formed by warp yarns that are overlapped in the thickness direction, with loops for end joining formed by a pair of warp turning portions. The present invention relates to a press felt with a papermaking seam having a base fabric made of a woven fabric integrally woven on a loom so that two layers overlap each other.

  In order to improve the workability into the paper machine, a so-called seam felt in which end felts are drawn into a felt run and both ends thereof are joined to each other to be endless is widely used. In this type of felt with seam, the warp forming the base fabric is folded back in the thickness direction to form loops at both ends in the length direction, and the loops at both ends are alternately meshed so that the center holes of each other are aligned. In general, a configuration in which both ends are joined by passing a core wire through the common hole formed in this manner.

  On the other hand, in the press felt used in the press part of the paper machine, it is gradually thinned by being repeatedly compressed on the paper machine, and with this, the amount of voids in the base fabric gradually decreases. It is one of the important factors that influence water squeezing, and maintaining the level required by the part in which the paper machine is used is important for efficiently operating the paper machine.

  In order to suppress such a change in the amount of voids during continued use, the compression resistance, specifically, the compression resistance that does not easily crush against the compression force acting during use, and the original when the compression force is lost It is only necessary to improve the compression recovery property to recover the state, especially in the use part with a large amount of dewatering, the influence of the void amount on the water squeezing becomes large, so the felt for such a part ensures stable water squeezing Therefore, the importance of improving the compression resistance is further increased.

  Moreover, in order to increase the water squeezing of the felt, it is only necessary to increase the void amount of the base fabric. For this purpose, if a base fabric having a structure in which warp yarns are arranged in multiple layers is adopted in addition to thickening the yarn constituting the base fabric. Well, as such a multi-structure base fabric, there are known a multi-woven structure woven by multiple weaving with a loom and a laminated structure in which a plurality of woven fabrics separately woven by a loom are stacked. (See Patent Documents 1 to 5).

  However, the multi-woven structure has a disadvantage that the amount of voids during use is large, and sufficient compression resistance cannot be obtained. On the other hand, in the laminate structure, the change in the amount of voids during use is small, and in terms of compression resistance, it is more advantageous than that of the multi-woven structure. In the needling process of setting and further integrating the nonwoven fiber layer with the base fabric, it is necessary to adjust the size of the woven fabric to prevent wrinkles. There is.

  Therefore, the applicant of the present application aims to improve the difficulty of increasing the number of man-hours during production while retaining the advantages of a laminate structure having excellent compression resistance (Japanese Patent Application No. 2006-25558). ) Was proposed earlier. This is because a multiple weaving portion in which wefts are entangled so that a plurality of warps are integrated with each other, and a weft layer that is intertwined in each of the plurality of warps overlaps in the thickness direction to overlap a single weaving fabric layer. It is composed of repeating unit structures composed of a single-weave polymerized portion in a combined state.

  In addition, in the felt with seam, the greatest advantage is that it is easy to hang on the paper machine, but in the base fabric of the laminated structure, the loop tilts due to the displacement of the upper and lower fabric positions. There is a possibility, and the inclination of the loop becomes a factor of lowering the insertion property, and particularly when the inclination of the loop is unevenly generated, the insertion property is greatly reduced. From such a point of view, a laminated fabric is not suitable for a seamed felt, and a multiwoven fabric fabric is generally used.

On the other hand, in order to secure the compression resistance, which is an advantage of the laminate structure, there is a technology that stabilizes the shape of the loop while making the base part a laminate structure and making the vicinity of the loop a multi-woven structure. It is known (see Patent Document 6). According to this, it is possible to prevent the loop from inclining unevenly due to the displacement of the woven fabric constituting the base fabric, and to suppress a decrease in layability.
Japanese Patent Publication No. 5-47675 Japanese Patent Laid-Open No. 9-31881 JP 2001-254287 A JP 2000-256984 A Japanese Patent Laid-Open No. 2005-200819 WO2006 / 045892 Publication

  However, in the structure constituted by repeating the unit structure consisting of the multiple woven part and the single woven polymer part, the compression resistance can be improved by ensuring a large proportion of the single woven polymer part, Since there is a limit to the number of twills that can be allocated to the wefts of the single weaving polymerization part in a normal loom, there is a limit to increasing the ratio of the single weaving polymerization part, and a loom that can use more twill than usual is used. However, in this case, there is a problem that the manufacturing cost is significantly increased.

  In addition, in the case where the ground portion has a laminate structure and only the vicinity of the loop has a multi-woven structure, the structure difference is different between the vicinity of the loop and the ground portion. As a result, seam marks may occur on the paper, and if the width of the multi-woven structure portion is reduced to avoid the seam marks, the upper and lower base fabric layers are not sufficiently connected. Inconvenience occurs. Furthermore, when weaving a base fabric having such a structure, it is necessary to use two or more stitches to form a multi-woven structure in the vicinity of the loop. At this time, it is necessary to install a device for supplying warp yarns for multiple weaving parts, which increases the manufacturing cost.

  The present invention has been devised to solve such problems of the prior art, and its main purpose is to realize excellent compression resistance and at a low cost without using a special loom. It is an object of the present invention to provide a press felt with a paper seam configured so as to be manufactured.

  In order to solve such a problem, in the present invention, as shown in claim 1, a loop for end joining is formed at a folded part of a pair of warp yarns used in a press part of a paper machine. In a press felt with a seam for papermaking, having a base fabric made of a woven fabric integrally woven on a loom so that two base fabric layers composed of warps arranged in the thickness direction overlap each other, It has a plurality of binding wefts that move between the two base fabric layers and bond the base fabric layers to each other, and the plurality of binding wefts are spaced apart by a plurality of warp yarns arranged in the width direction. It was woven so as to constitute the base fabric layer while being replaced.

  According to this, except for the part where the connected wefts are replaced, many parts are laminated structures in which wefts that are intertwined with the warp yarns overlap each other in the thickness direction, so that multiple woven fabrics that are woven separately are overlapped Because it has a laminate structure similar to the base fabric, it is possible to obtain higher compression resistance than a base fabric with multiple woven structure, and by increasing the ratio of the laminate structure, Equivalent compression resistance can be achieved.

  In addition, the ratio of the laminate structure part is not related to the number of looms of the loom, and in order to increase the ratio of the laminate structure part, the number of texture rows (patterns of warp yarn movement patterns) is increased. It is only necessary to increase the number of tissue rows input to the personal computer that controls the machine, and the structure of the loom is not limited. For this reason, a base fabric having high compression resistance can be manufactured at low cost using an existing loom without introducing an expensive loom capable of using a particularly large number of twills.

  In the press felt with a seam for papermaking, as shown in claim 2, the structure structures of the base fabric layers on the papermaking surface side and the running surface side, each composed of a pair of warps forming the loop, are the same. It can be set as the structure which is. According to this, since the structure structure of the base fabric layer by each of the pair of warps forming the loop is the same, that is, the weft entanglement form for each warp is the same in the two base fabric layers. Thus, the external force acting on each of the warp yarns from the weft yarns becomes uniform at the base portion, the distortion of the loop can be sufficiently removed, and the shape of the loop can be accurately stabilized.

  In the press felt with a seam for papermaking, as shown in claim 3, the warp and the weft are composed of a monofilament single yarn having a diameter of 0.30 mm or more, or a monofilament twist yarn having a yarn count of 10.0 or less. It can be. According to this, in addition to the compression resistance improvement effect by the structure of the base fabric, the compression resistance of the felt can be further enhanced by using the thread material having excellent compression resistance.

  In the press felt with a seam for papermaking, as shown in claim 4, apart from the binding wefts, normal wefts constituting only a single base fabric layer without moving between the plurality of base fabric layers are provided. The normal wefts can be woven so that adjacent ones overlap each other in the thickness direction. According to this, since the laminate structure is formed by overlapping the normal weft yarns in the thickness direction and the ratio of the laminate structure portion can be further increased, the compression resistance can be improved.

  The base fabric according to the present invention is composed of only one woven fabric that is integrally woven on a loom, and a woven fabric that is woven separately from the woven fabric having the binding wefts. A laminated structure can also be used.

  As described above, according to the present invention, since many portions have a laminate structure except for the portion where the binding wefts are replaced, high compression resistance can be realized, thereby reducing the change in the amount of voids during continued use. Stable water squeezing can be ensured. Furthermore, the laminate structure portion can be appropriately increased without being limited by the structure of the loom, so that it is possible to produce a felt excellent in compression resistance at a low cost using an existing loom.

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

  FIG. 1 is a cross-sectional view in the length direction showing a felt according to the present invention. FIG. 2 is a schematic cross-sectional view in the width direction of the base fabric shown in FIG. FIG. 3 is a schematic diagram showing a state of weaving of the base fabric shown in FIG. FIG. 4 is a schematic diagram showing the A portion shown in FIG. 3 in an enlarged manner.

  As shown in FIG. 1, this felt is formed by laminating and integrating a non-woven fiber layer 2 on a base fabric 1 by needling, and the base fabric 1 travels with the first warp 3 on the papermaking surface 8 side. The second warp 4 on the surface 9 side is overlapped in the thickness direction to form a warp double structure. The first and second warps 3 and 4 are intertwined with the wefts 5a to 5h. First and second base fabric layers 11 and 12 are formed.

  In addition, end joining loops 17 and 18 are formed at both ends 15 and 16 in the length direction by turning back the yarns to be warp yarns 3 and 4, respectively, and are alternately meshed so that their center holes are aligned. The end portions 15 and 16 are joined to each other by inserting the core wire 19 for joining into the formed common hole.

  As shown in FIG. 2, the wefts (binding wefts) 5a to 5h are composed of two adjacent wefts 5a and 5b, wefts 5c and 5d, wefts 5e and 5f, and wefts 5g and 5h. In the region where one of the first warp 3 is intertwined to form the first base fabric layer 11, the other is intertwined with the second warp 4 to form the second base fabric layer 12, The two base fabric layers are moved between the first and second base fabric layers 11 and 12 so as to be interchanged at the same width direction position with a predetermined interval (for 5 sides of the warps 3 and 4). 11 and 12 are connected to each other.

  In this base fabric 1, the first and second base fabric layers 11, 12 by the first and second warps 3, 4 have the same structure, that is, the wefts for the first and second warps 3, 4. The entanglement forms 5a to 5h are the same in the first and second base fabric layers 11 and 12. Specifically, in the first base fabric layer 11 on the papermaking surface side, the wefts 5a to 5h are woven in a plain weave that floats and sinks for each warp 3, and the second base fabric layer on the running surface side. 12, the wefts 5 a to 5 h are woven in a plain weave that floats and sinks for each warp 4.

  As shown in FIG. 3, the base fabric 1 is woven using first and second warps 3 and 4 on the paper machine as driven yarns on the loom, and the wefts 5a to 5h on the paper machine are warps on the loom. The base fabric 1 is woven in an endless manner by bag weaving while forming the loops 17 and 18 by winding the thread into the loop forming core material 31 and forming the loops 17 and 18.

  Specifically, the loops 17 and 18 are formed on one of the ear portions 32 and 33 on the loom, and the thread to be warped 3 and 4 is hooked on the loop forming core member 31 at the ear portion 32 and folded back. After the loops 17 and 18 are formed and the base fabric 1 is woven in an endless manner in this way, the loop forming core material 31 is pulled out from the loops 17 and 18 so as to be unfolded.

  In FIG. 4, the numbers given to the warp yarns that become the weft yarns 5a to 5h indicate the twill numbers when weaving using 16 warps, and the warp yarns that become the weft yarns 5a to 5h are passed through different weir yarns. Then, as shown by a dotted line in FIG. 4, the yarn is moved so as to be entangled with the driving yarn to be the first and second warps 3 and 4.

  In this base fabric 1, as shown in FIG. 2, the wefts 5a to 5h which are intertwined with the warp yarns 3 and 4 are thick except for the portion where the pairs of wefts 5a to 5h are interchanged. Laminate structure with overlapping fabric layers that overlap each other in the vertical direction, so that high compression resistance can be obtained, thereby suppressing the change in void volume during continued use and ensuring stable water squeezing. can do.

  In addition, the ratio of the laminate structure part is not related to the number of looms of the loom, and in order to increase the ratio of the laminate structure part, the number of texture rows (patterns of warp yarn movement patterns) is increased. It is only necessary to increase the number of tissue rows input to the personal computer that controls the machine, and the structure of the loom is not limited.

  In particular, here, the first and second base fabric layers 11 and 12 by the first and second warp yarns 3 and 4 have the same structure, that is, the weft yarns 5a to 5 for the first and second warp yarns 3 and 4. Since the entangled form of 5h is the same in each of the first and second base fabric layers 11 and 12, the form of the loops 17 and 18 can be made uniform.

  The warps 3 and 4 and the wefts 5a to 5h are both monofilament single yarns. Polyamide is preferred as the material for both the warps 3 and 4 and the wefts 5a to 5h. The thickness of the warp yarns 3 and 4 and the weft yarns 5a to 5h is preferably 0.35 mm or more for both the warp yarns 3 and 4 and the weft yarns 5a to 5h. According to this, in addition to the compression resistance improvement effect by the structure of the base fabric, the compression resistance of the felt can be further enhanced by using the yarn excellent in compression resistance.

  FIG. 5 is a schematic sectional view in the width direction showing another example of the felt base fabric according to the present invention. The lengthwise cross section is substantially the same as the example of FIG.

  As in the above example, the base fabric 51 has a warp double structure in which the first warp 53 on the papermaking surface side and the second warp 54 on the traveling surface side are provided to overlap in the thickness direction. However, here, unlike the above example, the structure of the first and second base fabric layers 57 and 58 by the first and second warps 53 and 54 is different from each other, that is, the first and second warps. The entanglement form of the wefts 55a to 55h with respect to 53 and 54 is different between the first and second base fabric layers 57 and 58.

  Specifically, in the first base fabric layer 57 on the papermaking surface side, the wefts 55a to 55h pass through the papermaking surface side of one warp 53 after passing through the traveling surface side of the three warps 53. It is woven in one break. On the other hand, in the second base fabric layer 58 on the running surface side, the wefts 55a to 55h are woven in a plain weave that floats and sinks for each warp 54.

  As in the above example, the wefts (binding wefts) 55a to 55h are regions in which one of the paired ones is intertwined with the first warp 53 to form the first base fabric layer 57, and the other is A second base fabric layer 58 is formed by being intertwined with the second warp 54, and the first and second base fabric layers 57 are replaced with each other at a predetermined interval (seven sides of the warps 53 and 54). -It moves between 58 and the two base fabric layers 57 and 58 are mutually joined.

  In this base fabric 51, except for the portion where the wefts 55a to 55h that are paired with each other are interchanged, many portions of the wefts 55a to 55h entangled with the warps 53 and 54 overlap in the thickness direction and are independent of each other. Since the laminated structure is formed by laminating the woven fabric layers, high compression resistance can be obtained, whereby the change in the amount of voids during continuous use can be kept small, and stable water squeezing can be ensured.

  Further, in the base fabric 51, since the two base fabric layers 57 and 58 are securely joined, the base fabric layers 57 and 58 are not displaced from each other, and the inclination of the end joining loop is as follows. Almost does not occur. However, in this base fabric 51, since the structure structures of the two base fabric layers 57 and 58 are different from each other, the external force acting on each of the warp yarns 53 and 54 from the weft yarns 55a to 55h becomes uneven at the base portion of the loop. There is a possibility that slight distortion will occur. On the other hand, if the structure structure of the two base fabric layers 11 and 12 is the same as in the example shown in FIG. 2, the weft yarns 5a to 5h are changed to the warp yarns 3 and 4 at the base portions of the loops 17 and 18, respectively. The applied external force becomes uniform, the distortion of the loops 17 and 18 can be sufficiently removed, and the form of the loops 17 and 18 can be accurately stabilized.

  FIG. 6 is a cross-sectional view in the length direction showing another example of the felt according to the present invention. FIG. 7 is a schematic cross-sectional view in the width direction of the base fabric shown in FIG.

  As in the above example, the base fabric 61 has a warp double structure in which a first warp 63 on the papermaking surface side and a second warp 64 on the running surface side are provided to overlap in the thickness direction. However, here, unlike the above example, of the wefts 65a to 65h constituting the unit structure, the wefts (ordinary wefts) 65c, 65d, 65g and 65h are the base fabrics of the first and second warp threads 63 and 64. Only one of the first and second base fabric layers 67 and 68 is configured without moving between the layers 67 and 68.

  As shown in FIG. 7, the wefts (binding wefts) 65 a, 65 b, 65 e, and 65 f are regions in which one of the pairs is intertwined with the first warp 63 to form the first base fabric layer 67. Then, the other is intertwined with the second warp 64 to form the second base fabric layer 68, and the first and second are so arranged that they are interchanged with each other at a predetermined interval (three sides of the warps 63 and 64). By moving between the base fabric layers 67 and 68, the two base fabric layers 67 and 68 are bonded to each other.

  In this base fabric 61, the two wefts 65a and 65b and the wefts 65e and 65f intertwined with the warps 63 and 64 are in the thickness direction except for the portion where the wefts (joining wefts) 65a, 65b, 65e and 65f are switched. Because it has a laminated structure that overlaps the fabric layers independent of each other, high compression resistance can be obtained, thereby suppressing the change in the amount of voids during continued use and ensuring stable water squeezing. Can do.

  In particular, here, weft yarns (normal weft yarns) 65c, 65d, 65g, and 65h that do not move between the base fabric layers 67 and 68 are provided close to each other, and the two weft yarns 65c and 65d and the weft yarns are provided. Since the laminate structure is formed by overlapping 65 g and 65 h in the thickness direction, the ratio of the laminate structure portion can be increased, so that the compression resistance can be improved.

  The press felt with a seam for papermaking according to the present invention achieves excellent compression resistance and has the effect of being able to be manufactured at low cost without using a special loom. ), Especially for parts that require a large amount of voids in the base fabric to ensure a large amount of dewatering, or parts that require high compression resistance due to high press pressure, etc. Useful as.

It is sectional drawing of the length direction which shows the felt by this invention. It is typical sectional drawing of the width direction of the base fabric shown in FIG. It is a schematic diagram which shows the condition of weaving of the base fabric shown in FIG. It is a schematic diagram which expands and shows the A section shown in FIG. It is typical sectional drawing of the width direction which shows another example of the felt base fabric by this invention. It is sectional drawing of the length direction which shows another example of the felt by this invention. It is typical sectional drawing of the width direction of the base fabric shown in FIG.

Explanation of symbols

1, 51, 61 Base fabric 2, Non-woven fiber layer 3, 4, 53, 54, 63, 64 Warp 5a-5h, 55a-55h, 65a, 65b, 65e, 65f Weft
65c ・ 65d ・ 65g ・ 65h Weft (normal weft)
8 Papermaking surface 9 Running surface 11, 12, 57, 58, 67, 68 Base fabric layer 17, 18 Loop

Claims (4)

Used in a press part of a papermaking machine, a loop for end joining is formed at a pair of folded warp yarns, and two base fabric layers composed of warp yarns arranged in the thickness direction are two layers. A press felt with a paper seam having a base fabric made of a woven fabric integrally woven on a loom so as to overlap,
It has a plurality of binding wefts that move between the two base fabric layers and bond the base fabric layers to each other, and the plurality of binding wefts are spaced apart by a plurality of warp yarns arranged in the width direction. A press felt with a seam for papermaking, which is woven so as to constitute the base fabric layer while being replaced.   2. The papermaking seam according to claim 1, wherein the structure structure of the base fabric layer on the papermaking surface side and the running surface side, which is constituted by each of the pair of warp forming the loop, is the same. Press felt.   The papermaking seam according to claim 1 or 2, wherein the warp and weft are made of a monofilament monofilament having a diameter of 0.30 mm or more, or a monofilament twist yarn of a yarn count of 10.0 or less. Press felt with.   Separately from the binding wefts, there is a normal weft that constitutes only a single base fabric layer without moving between the plurality of base fabric layers, and these normal wefts are adjacent to each other in the thickness direction. The press felt with a seam for papermaking according to any one of claims 1 to 3, wherein the press felt is woven so as to overlap with each other.

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