Paper making felt and cutting method of paper making felt

Abstract

To provide a paper making felt and a cutting method of the paper making felt that can prevent deposition of fragments of yarns to a felt surface by excellent visibility of fragments of yarns caused by cutting.SOLUTION: A paper making felt 5 is assembled with a base cloth 30 and a batt fiber layer laminated on the base cloth 30, wherein the base cloth 30 has luminescence parts 10A, 20A, 30A comprising a plurality of luminescent yarns arranged over total lengths in a width direction (CMD) and a height direction (MD) so as to fragment the base cloth, and is provided with a broken-line mark 61 which points a position of the luminescence part 10A and broken-line marks 64, 65, 66 which point the position of the luminescence part 20A. In a cutting method of the paper making felt, sites having the luminescence parts 10A, 20A, 30A are cut based on the marks 61, 64, 65, 66.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present invention relates to a papermaking felt (hereinafter also referred to as "felt") used in the press part of a papermaking machine and a method for cutting this papermaking felt. More specifically, the present invention relates to a papermaking felt that has excellent visibility of broken threads generated by cutting, thereby preventing the adhesion of broken threads to the felt surface, and a method for cutting this papermaking felt. [Background technology]

[0002] Papermaking felts are used in the press part of a papermaking machine. Papermaking felts are endless in the warp direction, hung over the machine's rolls, and run as the rolls rotate. The papermaking felt receives the wet paper, which contains about 80% moisture, transported from the wire part, and pressurizes the wet paper between a pair of press rolls to squeeze out the water. In this way, by passing the spinning felt together with the wet paper between the press rolls, the wet paper is squeezed out and its surface is smoothed. The paper is then sent to the next drying part with a moisture content of about 50%. A papermaking felt has a base fabric made of yarn and batt fiber layers laminated and intertwined on both sides of the base fabric. Therefore, if foreign matter adheres to the surface of the batt fiber layer, the foreign matter will become entangled and adhere to the batt fiber layer, and unless it is removed, it will leave a dent in the felt at a circumferential period. The wet paper with the dent may become waste paper, and the damage at that time will be enormous.

[0003] One example of this foreign matter is fragments (approximately 1mm to 10mm) of the threads (single threads or twisted threads) that make up the base fabric contained within the felt. These fragments of the yarns constituting the base fabric are generated when the felt is cut and the yarns of the base fabric are also cut at the same time as the batt fiber layer. As shown in Figure 12, when cutting felt in the direction in which the thread extends, the thread is likely to be cut into small pieces and break into thread fragments. For example, as shown in Figure 12(a), if thread 90 extends in a curved state rather than in a straight line, cutting along a straight cutting line C3 will produce thread fragments 91a, 91b, and 91c from thread 91. Also, as shown in Figure 12(b), if cutting line C4 is not straight but fluctuates in the direction in which straight thread 95 extends, thread fragments 92a, 92b, and 92c will be produced from thread 92. There are three main reasons why thread fragments from the base fabric are generated. First, during the finishing process of felt production, thread fragments extending in the length direction are generated when the width-direction edge of the felt is cut in the length direction. Second, when the edge of the felt comes undone or threads extending in the length direction come loose while the papermaking machine is in operation, it becomes necessary to cut the width of the edge because there is a risk that the threads may become tangled in the papermaking machine rolls or come into contact with the human body. During this width cutting, thread fragments extending in the length direction are generated. Finally, when the felt is cut in the width direction to remove it from the papermaking machine after use, thread fragments extending in the width direction are generated. When a new felt is laid on the paper machine, the felt scrapes against the floor, causing yarn fragments to adhere to the batt fiber layer on the surface. The yarn fragments are small and translucent, making them easy to miss, and it takes a long time to find and remove them.

[0004] Here, documents relating to felt using luminescent threads have been disclosed (see, for example, Patent Documents 1 to 8). Patent document 1 discloses a method for manufacturing a spiral base fabric, and describes that some of the weft threads are made of luminous threads in order to align adjacent narrow base fabrics in the weft direction so that the length of the narrow base fabric does not vary in each winding. Patent Document 2 discloses that a detector is used to detect an increase in luminescence intensity when paper is placed on a papermaking cloth, and luminescent threads are arranged to determine the shrinkage of the paper. Patent Document 3 discloses that when threads or batt fibers that fall off during the use of felt get mixed into paper and contaminate the paper, it is possible to identify which manufacturer the foreign matter came from in order to seek compensation from the manufacturer, and the content of including a photochromic material in the threads or batt fibers is disclosed. Patent Document 4 discloses an industrial textile having a luminous portion formed by applying a resin containing a luminescent agent to the surface of a woven fabric made of yarn, in order to ensure durability even in a dark, hot, and humid environment, while making it easy to visually check running conditions such as meandering and deviation. Patent Document 5 discloses that some of the yarns in a base fabric are fluorescent yarns in order to improve visibility when loops are formed during the production of a warp seam base fabric. Patent Document 6 discloses that fluorescent thread is used as a marker (sewing position) when sewing adjacent narrow base fabrics together in order to improve the visibility of the sewing position when sewing narrow base fabrics together. Patent Document 7 discloses that luminescent yarns are used in at least some of the warp or weft yarns of a papermaking cloth, and the degree of contamination of the papermaking cloth and the degree of wear of the yarns can be determined from changes in luminescence intensity. Patent Document 8 discloses a method for detecting wear of a press felt by incorporating a luminescent material into yarn or batt fibers, thereby visualizing which layers of the press felt are exposed. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6497678 [Patent Document 2] Patent No. 3726118 [Patent Document 3] British patent number 2315499 [Patent Document 4] Patent No. 6997916 [Patent Document 5] Japanese Patent Publication No. 2023-70320 [Patent Document 6] Patent No. 6718731 [Patent Document 7] International Publication No. 2012 / 175670 [Patent Document 8] Special Publication No. 2007-521406 Summary of the Invention [Problem to be solved by the invention]

[0006] However, although all of the above documents are about felt using luminous thread, they do not use the luminous thread for the purpose of accurately detecting and removing thread fragments that arise when the felt is cut, and therefore do not describe specific means or techniques for accurately detecting and removing thread fragments while keeping costs down.

[0007] The present invention has been made in consideration of the above-mentioned current situation, and aims to provide a papermaking felt and a method for cutting this papermaking felt that suppresses adhesion of thread fragments to the felt surface by improving the visibility of thread fragments generated by cutting while keeping costs down. [Means for solving the problem]

[0008] The means for solving the above problem are as follows. 1. A papermaking felt comprising a base fabric having woven and / or nonwoven yarns and a batt fiber layer laminated to the base fabric, The base fabric has at least one light-emitting portion made of a plurality of light-emitting threads arranged so as to divide the base fabric, A papermaking felt characterized in that it is provided with a mark indicating the position of the light-emitting portion. 2. The papermaking felt according to 1., wherein the mark is arranged on the surface of the batt fiber layer so as to correspond to the thickness direction of the light-emitting portion. 3. The papermaking felt according to 2., wherein the marks are arranged in the form of lines or dots. 4. The papermaking felt according to 2. or 3. above, wherein the markings are written in ink. 5. The papermaking felt described in 1., wherein the marker is made of a plurality of luminous threads that emit light in a color different from the color of the luminous portion, and is arranged adjacent to both sides of the luminous portion to form part of the base fabric. 6. A method for cutting a papermaking felt comprising a base fabric having woven and / or nonwoven yarns and a batt fiber layer laminated to the base fabric, comprising: The base fabric has at least one light-emitting portion made of a plurality of light-emitting threads extending so as to divide the base fabric, A method for cutting papermaking felt, characterized in that the area having the light-emitting portion is cut based on a mark that indicates the position of the light-emitting portion. 7. The method for cutting papermaking felt according to 6., wherein the marks are arranged on the surface of the batt fiber layer so as to correspond to the thickness direction of the light-emitting section, and cutting is performed along the marks. 8. The method for cutting papermaking felt described in 6. above, in which a plurality of the marks are arranged in the form of dots on the surface of the batt fiber layer so as to correspond to the thickness direction of the light-emitting section, and lines are drawn connecting the marks, and then the paper is cut along the lines. 9. A method for cutting papermaking felt as described in 6., in which the marker consists of a plurality of luminous threads that emit light in a color different from that of the luminous part, and constitutes part of the base fabric on both sides of the luminous part in the width direction, the position of the luminous part is confirmed from the side end face of the papermaking felt and cutting is started, and when the marker of a different color is exposed, the cutting direction is changed toward the luminous part. [Effects of the Invention]

[0009] The papermaking felt of the present invention can selectively cut the luminescent yarns among the yarns that make up the base fabric when cutting the felt, so that even if tiny pieces of yarn fall onto the floor around the papermaking machine, they can be more easily found. This allows the floor to be thoroughly cleaned, and when a new felt is loaded into the papermaking machine, even if the felt rubs against the floor, remaining pieces of yarn can be prevented from adhering to the felt, preventing contamination of the felt. In addition, felt can be colored in various colors depending on the usage environment. Furthermore, felt is subjected to tension during manufacturing and use, which causes the luminous portions, especially those extending in the width direction, to bend. Therefore, it is difficult to accurately determine the position of the locally provided luminous portions across the entire width direction through the batt fiber layer. Meanwhile, luminous yarn is relatively expensive, so replacing all of the threads constituting the base fabric with luminous yarn would result in high costs. By providing a mark indicating the position of the luminous portion, even if luminous yarn is used only in part of the base fabric, it becomes possible to accurately determine the position of the luminous portion and cut it, regardless of the usage environment of the felt.

[0010] Furthermore, when at least one light emitting portion extending in the width direction is provided, the felt that is hung can be cut in the width direction to remove the felt as an endless belt. When the mark is disposed on the surface of the batt fiber layer so as to correspond to the thickness direction of the light emitting portion, the position of the light emitting portion can be confirmed by the mark. When the marks are provided in the form of lines or dots in the direction in which the light-emitting portions extend, the positions of the light-emitting portions can be more easily grasped with high accuracy. Indicia may be ink markings that do not alter the appearance of the felt. The marker is made of a plurality of luminous threads that emit light in a color different from the color of the luminous portion, and is particularly preferable when it is arranged adjacent to both sides of the luminous portion along the extension direction of the luminous portion to form part of the base fabric, since the felt marker is not visible externally. According to the method for cutting papermaking felt of the present invention, the portion having the light-emitting portion can be easily cut based on the mark indicating the position of the light-emitting portion. If the mark is arranged on the surface of the batt fiber layer so as to correspond to the thickness direction of the light emitting portion, the mark can be easily cut along the mark. The markings are arranged in a dot pattern on the surface of the batt fiber layer in a thickness direction of the light-emitting portion, and a line is drawn connecting the markings, and then the cutting is performed along the line. This is preferable in terms of appearance, as it does not change the appearance much except when the felt is cut. The markings are made of a plurality of luminous threads that emit light in a color different from that of the luminous portion, and constitute part of the base fabric on both sides of the luminous portion in the width direction. The position of the luminous portion is confirmed from the side end face of the papermaking felt, cutting is started, and when the marker of a different color is exposed, the cutting direction is changed toward the luminous portion to cut the felt, which is particularly preferred because the marker on the felt is not visible externally. [Brief explanation of the drawings]

[0011] The present invention will be further described in the following detailed description by way of non-limiting examples of exemplary embodiments according to the present invention and with reference to the mentioned drawings, in which like reference numerals refer to like parts throughout the several views of the drawings. [Figure 1] 1 is a schematic plan view showing a papermaking felt according to a first embodiment. FIG. [Figure 2] 2 is a schematic cross-sectional view taken along the line A-A' in FIG. 1. [Figure 3] 1A is a schematic diagram showing the state of the felt of the first embodiment when it is being put into a paper machine, and FIG. 1B is a schematic diagram showing the state of the felt when it is being replaced. [Figure 4] 1A is a schematic plan view showing the state of the felt of the first embodiment when it is being hung on a paper machine, and FIG. 1B is a schematic plan view showing the state of the felt when it is being replaced. [Figure 5] 1A is a schematic plan view showing the state of the felt of the second embodiment when it is being hung on a paper machine, and FIG. 1B is a schematic plan view showing the state of the felt when it is being replaced. [Figure 6] 1A is a schematic plan view showing the state of the felt of the third embodiment when it is being hung on a paper machine, and FIG. 1B is a schematic plan view showing the state of the felt when it is being replaced. [Figure 7] FIG. 7 is a schematic cross-sectional view taken along the line BB′ in FIG. [Figure 8] FIG. 10 is a schematic plan view showing a papermaking felt according to a fourth embodiment. [Figure 9] 9 is a schematic cross-sectional view taken along the line CC' in FIG. 8. [Figure 10] FIG. 10 is a schematic plan view showing the light-emitting portion of the papermaking felt of the fifth embodiment. [Figure 11]11 is a schematic cross-sectional view taken along the line DD' in FIG. 10. [Figure 12] (a) is a schematic diagram showing how a non-straight thread is cut and fragments are generated, and (b) is a schematic diagram showing how a straight thread is cut and fragments are generated. DETAILED DESCRIPTION OF THE INVENTION

[0012] The matters set forth herein are for illustrative purposes only and are intended to provide an illustrative description of the embodiments of the present invention, with the aim of providing what is believed to be the most effective and easily understandable explanation of the principles and conceptual features of the present invention. In this regard, it is not intended to show structural details of the present invention beyond the extent necessary for a fundamental understanding of the present invention, and the description, taken together with the drawings, will make clear to those skilled in the art how some forms of the present invention may be actually embodied.

[0013] [1] Papermaking felt The papermaking felt of the present invention will be described in more detail below with reference to the following embodiments. Embodiments 1 to 3 are papermaking felts having luminous portions in the width direction, embodiment 4 is a papermaking felt having luminous portions in the length direction, and embodiment 5 is a papermaking felt having luminous portions in both the width and length directions.

[0014] [Embodiment 1] A papermaking felt 1 according to a first embodiment is shown in Figure 1. Figure 1 is a schematic plan view of the papermaking felt 1, omitting the batt fiber layer (the same applies to Figures 4 to 6, 8, and 10). However, for conceptual purposes, marks 61 provided on the surface of the batt fiber layer are shown. The length of the papermaking felt 1 in the cross-machine direction (CMD) is not particularly limited, but is usually 3 to 10 m. As shown in Figure 2, the papermaking felt 1 has a base fabric 10, a front batt fiber layer 40, and a back batt fiber layer 50 that are intertwined and laminated on the base fabric 10. The base fabric 10 has at least one strip-shaped light-emitting portion 10A extending in the width direction, and a linear mark 61 is provided on the surface 40a of the front batt fiber layer 40 at a position corresponding to the thickness direction of the light-emitting portion 10A. When the felt 1 is laid over a paper machine, the front surface 40a of the front batt fiber layer 40 becomes the papermaking surface of the papermaking felt 1, and the back surface 50a of the back batt fiber layer 50 becomes the running surface.

[0015] The material for the front batt fiber layer 40 and the back batt fiber layer 50 is not particularly limited, but examples thereof include polyamide resins such as nylon 6, nylon 66, nylon 610, and nylon 612; polyester resins such as polyethylene terephthalate and polybutylene terephthalate; and polyolefin resins such as polyethylene and polypropylene; as well as synthetic resins, cotton, wool, and silk. Among these, polyamide resin is preferred as the material for the batt fiber layer from the viewpoints of abrasion resistance, compression recovery, impact resistance, hydrophilicity, hydrolysis resistance, chemical resistance, and the like.

[0016] 2, the base fabric 10 can be a plain double weave consisting of wefts 11 and 12 and a warp 14, but the weave is not particularly limited and may be a plain weave, twill weave, satin weave, or a combination thereof, and the weave structure may be either a single-layer structure or a multi-layer structure. Furthermore, the base fabric is not limited to a woven base fabric made of warp and weft threads, and may be a base fabric formed by melting molten fibers onto unwoven warp and weft threads.

[0017] The yarn material may be synthetic resins such as polyamide resins such as nylon 6, nylon 66, nylon 610, nylon 612, etc.; polyester resins such as polyethylene terephthalate, polybutylene terephthalate, etc.; polyolefin resins such as polyethylene, polypropylene, etc. Of these, polyamide resins are particularly preferred as the yarn material for the base fabric, as they can be used to produce papermaking felt that is excellent in abrasion resistance, compression recovery, impact resistance, etc.

[0018] The yarn may be in the form of a monofilament, a multifilament, or a twisted yarn obtained by twisting these yarns together. The diameter of the yarn is not particularly limited. When the yarn is in the form of a monofilament, its diameter is preferably 0.10 mm to 0.60 mm, more preferably 0.20 mm to 0.50 mm. When the yarn is in the form of a multifilament, the fineness of the monofilaments constituting the multifilament is usually 3 dtex to 1,000 dtex, preferably 5 dtex to 600 dtex. When the yarn is in the form of a multifilament, the number of filaments in the multifilament is usually 2 to 300, preferably 2 to 100. The yarn constituting the base fabric may be of one type or two or more types.

[0019] The base fabric according to the present invention has at least one luminous portion made of a plurality of luminous threads arranged so as to divide the base fabric. The extending direction of the luminous portion is not particularly limited, but it usually extends over the entire width of the base fabric in the cross-machine direction (CMD) or length direction (MD). The base fabric 10 according to the first embodiment has at least one strip-shaped light emitting portion 10A extending in the width direction. This light emitting portion 10A is the portion to be cut when removing the felt 1. The light emitting portion 10A extending in the width direction may be provided in multiple locations across the entire width of the base fabric 10.

[0020] 2, the light emitting section 10A has adjacent light emitting threads 111, 112 extending in the width direction. "Adjacent" means adjacent to the light emitting threads 111 in the first layer, adjacent to the light emitting threads 112 in the second layer, and adjacent to the light emitting threads 112 in the second layer that are adjacent to the light emitting threads 111 in the first layer. Specifically, of the weft threads 11, 12 that make up the base fabric 10, a plurality of weft threads 11 made up of luminous yarns 111, 112 make up the luminous portion 10A, and a plurality of weft threads 12 made up of ordinary weft threads 121, 122 make up the ordinary base fabric portion 10B. Note that the warp threads 14 made up of warp threads 141, 142 are not arranged along the width direction, so ordinary yarns are used for the warp threads 14. Here, "luminous yarn" refers to yarn that emits light containing pigments such as fluorescent, phosphorescent, luminescent, and phosphorescent, and also includes reflective yarn containing metal. Among these, yarn that emits light when irradiated with an ultraviolet light source such as black light (wavelength 365 to 405 nm) is preferred. Furthermore, "normal yarn" refers to yarn that does not have luminescence properties.

[0021] The width W1 of the light-emitting portion 10A in the length direction is not particularly limited, but is preferably 0.3 to 3 m, and typically 0.5 to 1.5 m. As shown in Figure 3(a), immediately after the felt 1 is placed between the rolls 80 and 81 of the papermaking machine, the light-emitting portion 10A extends relatively straight in the width direction (relatively perpendicular to the length direction). However, after the papermaking machine has been in operation for a long time, the light-emitting portion 10A curves in the running direction, as shown in Figure 3(b). Figure 3 is a schematic diagram; when the press felt is actually placed in the papermaking machine, it is pressed by the press rolls and rotates at high speed while bending inward and outward (receiving stress) through multiple rolls, which can easily cause problems such as distortion of the base fabric (streaks). Since the light-emitting portion cannot maintain a straight shape, markings can be used to help guide the cutting process. Furthermore, in order to cut the light-emitting portion 10A of the felt 1 straight across the width, the dimension of the width W1 in the height direction of the light-emitting portion 10A shown in Figure 1 must be approximately the above dimension so that the cut point does not stray from the light-emitting portion 10A. The number of the light-emitting threads 111 etc. is not particularly limited, but is preferably 200 to 2000, and more preferably 300 to 1500.

[0022] 2, a mark 61 is provided on the surface 40a of the front batt fiber layer 40 at a position corresponding to the light emitting unit 10A in the thickness direction. That is, the mark 61 is disposed on the surface 40a of the front batt fiber layer 40 so as to correspond to the light emitting unit 10A in the thickness direction. Specifically, a dashed line mark 61 is provided on the surface 40a of the front batt fiber layer 40 directly above the light-emitting portion 10A, extending across the entire width, at the center of the width W1 of the light-emitting portion 10A. This allows the felt 1 to be cut along the mark 61 accurately, even if the position of the light-emitting portion 10A is difficult to see from the surface 40a of the front batt fiber layer 40 because the felt 1 has been colored during use, or even if the light-emitting portion 10A is deformed by being curved in the length direction, as shown in FIG. 4(b). As a result, the visibility of yarns scattered around the papermaking machine can be improved without changing all of the yarns constituting the base fabric 10 to luminous yarns, and contamination of the felt 1 can be effectively reduced. The mark 61 is not limited to a dashed line, but may be a solid line, a dashed line, a two-dot dashed line, or a dotted line. The method for applying the mark 61 is not particularly limited, and the mark 61 may be printed, stamped, or drawn with a felt-tip pen. The mark 61 may be written in ink applied to the surface 40a of the front batt fiber layer 40. Furthermore, if the mark 61 is written in ink containing a luminescent material, the mark 61 will emit light only when the felt 1 is cut, without changing its appearance except when the felt 1 is cut, allowing the base fabric 10 to be cut accurately with the luminescent part 10A. Furthermore, this mark 61 is placed at a position corresponding to the position of the light-emitting unit 10A, and as long as the position of the light-emitting unit 10A can be confirmed, various marks may be used, such as at both ends in the length direction, rather than at the center of the width W1 of the light-emitting unit 10A. Furthermore, although the mark 61 in FIG. 4( a ) is provided on the surface 40 a of the front batt fiber layer 40 , it may also be provided on the surface 50 a of the back batt fiber layer 50 .

[0023] [Embodiment 2] As shown in Fig. 5(a), the papermaking felt 2 according to the second embodiment is similar to the papermaking felt 1 according to the first embodiment in that markers 62 and 63 are provided in the form of dots on the surface 40a of the front batt fiber layer 40 immediately above both edges of the light-emitting portion 10A in the width direction (CMD in Fig. 1). This configuration ensures that even if the light-emitting portion 10A cannot be seen from the surface 40a of the front batt fiber layer 40 shown in Fig. 2, or even if the light-emitting portion 10A is deformed by being curved in the length direction when cutting the felt as shown in Fig. 2(b), the base fabric 10 including the light-emitting portion 10A can be accurately cut by cutting along the cutting line C1, which is the straight line connecting the markers 62 and 63. The markers 62 and 63 may be provided by any method, such as by printing or stamping, or by drawing with a writing implement such as a felt-tip pen. The marks may be arranged in a dot pattern on the surface 40a of the batt fiber layer 40 so as to correspond to the thickness of the light-emitting unit 10A. In this case, the line connecting the marks can be used as the cutting line. The other configurations and effects are the same as those described in the first embodiment, and therefore the description thereof will be omitted.

[0024] [Embodiment 3] As shown in FIG. 6(a), the papermaking felt 3 according to the third embodiment includes a base fabric 15 having a luminescent portion 16A instead of the base fabric 10 having the luminescent portion 10A in the first and second embodiments. Specifically, the marker 17A is made up of multiple luminous threads that emit light in a different color from the luminous portion 16A, and is arranged adjacent to both sides of the luminous portion 16A along the luminous portion 16A extending in the width direction, forming part of the base fabric 15. The markers 17A are made of luminous thread, forming a luminous region 15A consisting of the luminous portion 16A extending in the width direction and the markers 17A arranged adjacent to both sides of the luminous portion 16A along the luminous portion 16A. With this configuration, the range of the luminous portion 16A can be more clearly identified when a light such as a black light is shone on the surface 40a of the front batt fiber layer 40. 7, in the luminous region 15A, the weft thread portion 11 consisting of luminous yarns 111 and 112 of the weft thread portions 11 and 18 constituting the base fabric 15 constitutes the luminous portion 16A, and the weft thread portion 18 consisting of luminous yarns 181 and 182 constitutes the mark 17A. The weft thread portion 12 consisting of weft threads 121 and 122, which are ordinary yarns, constitutes the ordinary base fabric portion 15B. Note that the warp thread portion 14 consisting of warp threads 141 and 142 is not arranged along the width direction, so ordinary yarn is used for the warp thread portion 14. The number of threads constituting the light emitting portion 16A and the mark 17A is not particularly limited, and can be appropriately selected so as to clearly define the range of the light emitting portion 16A. With this configuration, even if light-emitting portion 16A is bent and deformed in a complex manner during cutting of felt 4, as shown in FIG. 6(b), when the cross section of one edge of felt 4 is illuminated with a black light or the like, light-emitting portion 16A can be clearly identified due to the difference in brightness between light-emitting portion 16A and mark 17A. Then, the cutting blade is advanced along cutting line C2 while observing the cross section toward the other edge, and when the cutting blade approaches mark 17A, the difference in brightness between light-emitting portion 16A and mark 17A makes it possible to correct the cutting blade and advance it toward light-emitting portion 16A. As a result, the base fabric can be cut more accurately at the light-emitting regions (16A, 17A) made of light-emitting yarn. If it is difficult to determine the starting point of cutting the edge, a mark can be provided on the surface 40a of the face batt fiber layer 40 directly above the edge, as described in the third embodiment. The other configurations and effects are the same as those described in the first embodiment, and therefore the description thereof will be omitted.

[0025] [Embodiment 4] As shown in Fig. 8, the papermaking felt 4 according to the fourth embodiment has light-emitting portions 20A extending along the length of both widthwise edges of the base fabric 20. Fig. 8 is a schematic plan view of the papermaking felt 4, omitting the batt fiber layer. However, in the enlarged view, conceptual marks 64, 65, and 66 provided on the surface of the batt fiber layer are shown. The base fabric 20 consists of a lengthwise luminous portion 20A and a normal base fabric portion 20B, and has the same configuration as the base fabric 10 of embodiment 1, except that the widthwise luminous portion 10A is replaced by a lengthwise luminous portion 20A. The light-emitting portion 20A can be provided at one location along each widthwise edge of the base fabric 20, or multiple locations along the lengthwise edge. As shown in FIG. 8, the light-emitting portion 20 can have, for example, three light-emitting portions 21A, 22A, and 23A along both edges. The reason for providing multiple light-emitting portions 21A, 22A, and 23A in the light-emitting portion 20A is to allow for flexibility in the distance from the end edge 20e to the cutting point. The width W2 of each light-emitting portion is not particularly limited, but is preferably 1 to 3 cm, and more preferably 1.5 to 2.5 cm. The spacing U between the inter-light-emitting portions 22B and 23B that constitute the normal base fabric portion 20B is not particularly limited, but is preferably 3 to 7 cm, and more preferably 4 to 6 cm. The width V between the light-emitting portion 21A and the end edge 20e is also not particularly limited, but can be 6 to 8 cm. Furthermore, dashed line marks 64 (see FIG. 9), 65, and 66 are arranged lengthwise on the surface 40a of the batt fiber layer 40 directly above the light-emitting portions 21A, 22A, and 23A at the center of each width W2. This allows the light-emitting portion 20A to accurately cut the base fabric 20 along the marks 64, 65, and 66 when the light-emitting portion 20A is not visible from the surface 40a of the front batt fiber layer 40. The marks 64, 65, and 66 are not limited to dashed lines, but may be straight lines, dashed lines, or double-dashed lines, or may be dotted. The marks 64, 65, and 66 may be provided by any method, including printing, stamping, or drawing with a felt-tip pen. The other configurations and effects are the same as those described in the first embodiment, and therefore the description thereof will be omitted.

[0026] [Embodiment 5] 10, the papermaking felt 5 according to the fifth embodiment has a base fabric 30 that includes the width-direction light-emitting portion 10A according to the first embodiment and the length-direction light-emitting portion 20A according to the fourth embodiment. Similarly, a mark 61 is arranged on the surface 40a of the front batt fiber layer 40 directly above the light-emitting portion 10A, and marks 64, 65, and 66 are arranged on the surface 40a of the front batt fiber layer 40 directly above the light-emitting portion 20A. Furthermore, it has a light emitting portion 30A where the light emitting portion 10A and the light emitting portion 20A intersect. The area excluding the light emitting portions 10A and 20A is a normal base fabric portion 30B, which has substantially the same configuration as the normal base fabric portions 10B and 20B. 11, the luminescent section 30A (31A, 32A, 33A) including the luminescent section 10A and the luminescent section 20A is composed of a weft section 11 made of luminescent yarns 111 and 112 that make up the base fabric 30, and a warp section 13 made of luminescent yarns 131 and 132. As described above, the luminescent section 10A is composed of a weft section 11 made of luminescent yarns 111 and 112, and a warp section 14 made of normal yarns 141 and 142.

[0027] The papermaking felt 5 according to the fifth embodiment has the configurations of both the felt 1 according to the first embodiment and the felt 4 according to the fourth embodiment, and therefore can achieve the effects of both. The other configurations and effects are the same as those described in the first and fourth embodiments, and therefore a description thereof will be omitted.

[0028] [2] How to cut papermaking felt The papermaking felt cutting method will be described mainly with reference to the papermaking felt 5 according to the fifth embodiment. As shown in Figures 10 and 11, the papermaking felt 5 has a base fabric 30, a front batt fiber layer 40, and a back batt fiber layer 50, which are intertwined and laminated on the base fabric 30. The base fabric 30 has strip-shaped light-emitting portions 10A and 20A extending in the width and length directions. Marks 61, 64, 65, and 66 are arranged on the surface 40a of the front batt fiber layer 40. The details of the configuration are the same as those described in [1] above. It is preferable that the light-emitting portions 10A extending in the width direction are provided in multiple locations.

[0029] <How to cut widthwise> The papermaking felt 5 is usually cut in the width direction in order to remove it from the papermaking machine after use. Therefore, the felt 5 is cut while still hung in the papermaking machine. A mark 61 is placed in advance in the form of a line or a dot directly above the light-emitting portion 10A on the surface 40a of the outer batt fiber layer 40 along the direction in which the light-emitting portion 10A extends, and the material is cut in the width direction along the mark 61 to the other end using a cutting tool such as a cutter or scissors. After one cut is completed, the cut felt 5 is folded, for example, in an accordion shape and pulled out toward the side of the paper machine. The remaining felt 5 is then pulled down, and both widthwise edges are supported, and the cutting operation is carried out in the same manner as above, and the same operation is repeated thereafter. It is also possible to cut only one place, pull down, and fold it in an accordion shape.

[0030] Furthermore, as in the felt 2 of embodiment 2, dot-shaped marks 62, 63 can be placed directly above both widthwise edge portions of the light-emitting section 10A on the surface 40a of the surface batt fiber layer 40, and cutting can be performed along the distance between the marks 62, 63 at both edge portions. Alternatively, multiple dot-shaped marks may be arranged on the surface 40a of the batt fiber layer 40 in a dot pattern corresponding to the thickness direction of the light-emitting unit 10A, and lines may be drawn connecting these marks, followed by cutting along the lines. Furthermore, as in the felt 3 of embodiment 3, the mark 17A is made up of a plurality of luminous threads 181, 182 that emit light in a color different from the color of the luminous portion 16A, and is arranged adjacent to both sides of the luminous portion 16A along the extension direction of the luminous portion 16A to form part of the base fabric 15. Then, cutting can be started by checking the position of the luminous portion 16A from the side end face of the felt 3, and when the marker 17A of a different color is exposed, the cutting direction can be changed toward the luminous portion 16A and cutting can be continued. As described above, the fragments of the weft yarn generated when the yarn is cut are all made of luminous yarn, so even if they fall and scatter on the floor, they can be easily found and removed by illuminating with a black light or the like.

[0031] <How to cut lengthwise> The cutting of the papermaking felt 5 in the length direction is mainly carried out during the finishing process of the felt production and while the felt is in operation on the paper machine. As shown in Fig. 11, the felt 5 is obtained by laminating a front batt fiber layer 40 and a back batt fiber layer 50, which are formed by interlacing batt fibers, on both sides of a woven base fabric 30. As a finishing touch, both end edges in the width direction are cut lengthwise. When cutting, as shown in FIG. 8 (FIG. 10), the light emitting portion 20A (30A) extending in the length direction is cut in the length direction to even out both edge portions. Specifically, a mark 64 is placed in advance in the form of a broken line along the direction in which the light-emitting portion 20A (30A) extends directly above the light-emitting portion 20A (30A) on the surface 40a of the front batt fiber layer 40, and cutting is performed using a cutting tool such as a cutter or scissors along the mark 64. If the pre-applied marks are in the form of dots and there are only a few of them, additional lines may be drawn to connect the marks before cutting.

[0032] During operation of the papermaking machine, the warp threads of the base fabric 30 may protrude or come loose from the cut ends of the widthwise edge of the felt 5. In such cases, the edge can be trimmed even by cutting the adjacent light-emitting portion 22A (32A) over its entire length in the length direction. If the papermaking machine is operated further and the warp threads protrude or come loose, the edge can be trimmed even by cutting the light-emitting portion 23A (33A) adjacent to the light-emitting portion 22A (32A) on the inside in the width direction over its entire length in the length direction. As described above, all of the warp thread fragments that are produced when the felt 5 is cut are made of luminous threads, so even if the fragments fall and scatter on the floor when the felt 5 is cut, they can be easily found and removed by illuminating with a black light or the like. [Industrial Applicability]

[0033] The papermaking felt and cutting method of the present invention can be suitably used at any stage during the production of the felt, while the felt is in operation in a paper machine, and when the felt is removed after use. [Explanation of symbols]

[0034] 1, 2, 3, 4, 5; papermaking felt, 10, 15, 20, 30; base fabric, 10A, 16A, 20A (21A, 22A, 23A), 30A (31A, 32A, 33A); luminous part, 11 (111, 112), 13 (131, 132); luminous thread, 40, 50; batt fiber layer, 61, 62, 63, 64, 65, 66, 17A; marker.

Claims

1. A papermaking felt comprising a base fabric having woven and / or nonwoven yarns and a batt fiber layer laminated to the base fabric, the base fabric has at least one light-emitting portion made of a plurality of light-emitting threads arranged so as to divide the base fabric, A papermaking felt characterized in that it is provided with a mark indicating the position of the light-emitting portion.

2. 2. The papermaking felt according to claim 1, wherein the marks are arranged on the surface of the batt fiber layer so as to correspond to the thickness direction of the light emitting portion.

3. 3. The papermaking felt according to claim 2, wherein the marks are provided in the form of lines or dots.

4. 4. The papermaking felt according to claim 2, wherein the markings are written in ink.

5. 2. The papermaking felt according to claim 1, wherein the markers are made of a plurality of luminous threads that emit light in a color different from the color of the luminous portion, and are arranged adjacent to both sides of the luminous portion to form part of the base fabric.

6. A method for cutting a papermaking felt comprising a base fabric having woven and / or nonwoven yarns and a batt fiber layer laminated on the base fabric, comprising: The base fabric has at least one light-emitting portion made of a plurality of light-emitting threads extending so as to divide the base fabric, A method for cutting papermaking felt, characterized in that the area having the light-emitting portion is cut based on a mark that indicates the position of the light-emitting portion.

7. 7. The method for cutting papermaking felt according to claim 6, wherein the marks are arranged on the surface of the batt fiber layer so as to correspond to the thickness direction of the light-emitting portion, and cutting is performed along the marks.

8. 7. The method for cutting papermaking felt according to claim 6, wherein the marks are arranged in a dot pattern on the surface of the batt fiber layer so as to correspond to the thickness direction of the light-emitting section, and lines are drawn connecting the marks, and then the papermaking felt is cut along the lines.

9. 7. A method for cutting papermaking felt according to claim 6, wherein the markers are made of a plurality of luminous threads that emit light in a color different from that of the luminous portion, and constitute part of the base fabric on both sides of the luminous portion in the width direction, the method comprising confirming the position of the luminous portion from a side end face of the papermaking felt before starting cutting, and changing the cutting direction toward the luminous portion when the markers of a different color are exposed.

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