JP5073604B2 - Papermaking felt and method for producing the same - Google Patents

Description

  The present invention relates to a papermaking felt in which a batt fiber layer is integrated with a base fabric layer having a multilayer structure, and a method for producing the same.

  In felts for papermaking, a vat fiber layer of the required thickness is laminated and integrated with the base fabric layer. However, if the surface of the base fabric layer has significant irregularities, the pressure state during pressurization with a press roll is Due to the non-uniformity, marks (pressure spots) appear on the paper, which deteriorates the surface properties of the paper. For example, when high pressure occurs along the warp during pressurization, streaks in the warp direction appear on the paper. Conversely, when high pressure occurs along the weft during pressurization, the weft direction streak appears. Appears.

  In order to avoid the deterioration of the surface property of the paper due to this mark, the surface of the base fabric layer should be smooth with few irregularities. Specifically, the base fabric layer is made dense with a thin thread material. However, if the entire base fabric layer has a dense structure with thin thread material, weaving becomes troublesome and the air permeability and porosity that affect the water squeezing required for the base fabric layer The inconvenience that the characteristic of this is impaired arises.

Therefore, there is a laminate structure in which the base fabric woven densely using thin thread material and the base fabric woven coarsely using thick thread material are overlapped, and the densely woven base fabric is arranged on the paper surface side. Widely employed (see, for example, Patent Documents 1 and 2).
JP 2000-256984 A Japanese Patent Laid-Open No. 2005-200819

  However, in the base fabric layer having the above-described laminate structure, in order to improve the surface property of the paper, it is sufficient to increase the yarn density by making the upper base fabric yarn arranged on the paper-making surface side as thin as possible. Since the time required for weaving becomes longer, there arises a problem that productivity is lowered, and there is a limit to increasing the yarn density.

  On the other hand, a method of contriving the weaving structure of the upper base fabric so as to reduce the streak marks in the warp direction and the weft direction according to the characteristics of the lower base fabric arranged on the running surface side can be considered. For example, when the lower base fabric has a weave structure claimed by the weft and the streaks in the weft direction appear strongly, adopting the weave structure claimed by the warp in the upper base fabric reduces the streaks in the weft direction. be able to.

  However, in such a method, for example, in order to reduce the streaks in the weft direction, if the weaving structure claimed by the warp is adopted for the upper base fabric, the upper base fabric can be reduced even if the streaks in the weft direction are reduced. In some cases, streak marks in the warp direction due to the above may remain, and the demand for improving the surface property of paper cannot be sufficiently satisfied.

  The present invention has been devised on the basis of such inventor's knowledge, and the main object of the present invention is to improve the surface property of the paper and to make it easy to manufacture. It is to provide a felt for use and a manufacturing method thereof.

  In order to solve such a problem, in the present invention, as shown in claim 1, in the felt for papermaking in which the bat fiber layer is integrated with the base fabric layer having a multilayer structure, the running in the base fabric layer is performed. A lower base fabric in which warps and wefts extending in the length direction and the width direction are entangled with each other is arranged on the surface side, and is woven on the paper surface side of the base fabric layer separately from the lower base fabric. An upper base fabric in which a first direction yarn and a second direction yarn extending in a first direction and a second direction, respectively, are entangled with each other. The first direction yarn mainly comprises a structure in which the ratio of passing through the papermaking surface side is higher than that of the second direction yarn, and the first direction yarn is densely arranged with a thicker thread material than the second direction yarn. It was supposed to form a structure.

  According to this, the second direction yarn does not claim in the upper base fabric, that is, the upper base fabric resembles a structure in which only yarns extending in one direction are densely arranged along the surface of the lower base fabric. Since the upper base fabric is in a thin and flat state as a whole, the smoothness of the surface of the base fabric layer on the papermaking surface side is improved, and the surface property of the paper can be improved. Moreover, since it is not necessary to increase the yarn density using a thin thread material, the production is easy.

  In this case, since the upper base fabric is in a thin and flat state, there is not much increase in the amount of voids due to the overlapping of the upper base fabric, and an appropriate void amount is secured by the lower base fabric.

  In the papermaking felt, as shown in claim 2, at least the first direction yarn may be arranged so as to extend obliquely with respect to the length direction and the width direction.

  According to this, in the lower base fabric, the warp yarn and the weft yarn extend in the length direction and the width direction, respectively, whereas in the upper base fabric, the first direction yarn is inclined with respect to the length direction and the width direction. And the lower base fabric and the upper base fabric do not become parallel to each other. Therefore, the other yarn is prevented from being fitted between the one yarn, and the base fabric layer is not easily crushed. For this reason, it is possible to maintain an appropriate amount of voids over a long period of time, and further improve the smoothness of the surface of the base fabric layer on the papermaking surface side, thereby improving the surface property of the paper and reducing the surface property. Can be suppressed.

  In the papermaking felt, as shown in claim 3, the angle formed between the extending direction of the first direction yarn of the upper base fabric and each of the length direction and the width direction is 10 degrees or more. Can do.

  According to this, it is possible to reliably avoid the inconvenience of being easily crushed when the yarn of the upper base fabric is fitted between the yarns of the lower base fabric. If the angle of the first direction yarn with respect to the length direction and the width direction is less than 10 degrees, the yarn of the upper base fabric is fitted between the yarns of the lower base fabric, which causes a disadvantage that the first direction yarn is easily crushed.

  It should be noted that the second direction yarn that is not the main body may be arranged so as to extend obliquely with respect to the length direction and the width direction. However, the second direction yarn is thinner than the first direction yarn. Since the second direction yarns are not crushed by being fitted between the yarns of the lower base fabric, they are arranged so as to be parallel or perpendicular to the length direction and the width direction. It is also possible to do.

  In the felt for papermaking, as shown in claim 4, the upper base fabric is a piece of woven fabric with ends obtained by cutting an original fabric woven by a loom as necessary. A plurality of warp yarns and weft yarns serving as one-direction yarns and second-direction yarns may be arranged in the length direction in a state where the warp yarns and the weft yarns are inclined with respect to the length direction and the width direction.

  According to this, it is possible to easily manufacture a base fabric in which the first direction yarn and the second direction yarn are arranged so as to extend obliquely with respect to the length direction and the width direction. Moreover, since the raw fabric woven fabric from which the woven fabric pieces are based only needs to have a small width dimension, weaving becomes easy.

  In order to increase the strength, it is advisable to join a plurality of woven fabric pieces arranged in the length direction. In this case, the woven fabric pieces can be joined by sewing with a sewing machine or welding with an ultrasonic welding machine. It is sufficient to do so.

  In the papermaking felt, as shown in claim 5, the upper base fabric is a raw fabric woven woven by a loom, with the yarn serving as the second direction yarn extending in the length direction, It can be set as the structure formed so that the thread | yarn used as a 1st direction thread | yarn may be distorted so that it may extend diagonally with respect to the width direction.

  According to this, it is possible to easily manufacture a base fabric in which only the first direction yarns are arranged so as to extend obliquely with respect to the length direction and the width direction. Here, since the 2nd direction thread | yarn is woven coarsely, the operation | work which distorts so that a 1st direction thread | yarn becomes diagonal can be performed easily.

  In the papermaking felt, as shown in claim 6, a plurality of one or both of staples and filaments are gathered so that the second direction yarns are flattened at the intersections with the first direction yarns. It can be set as the structure which consists of the gathered-yarn material.

  According to this, since the bending of the first direction yarn entangled with the second direction yarn is alleviated, the upper base fabric becomes thinner and flat, and the surface property of the paper can be further improved. Here, in order to make the aggregate yarn material flattened, that is, to make the yarn constituting the aggregate yarn material spread in the lateral direction along the first direction yarn, the binding force due to the entanglement between the yarns is relatively It needs to be weak.

  In the papermaking felt, as shown in claim 7, the second direction yarn is a sweet twist obtained by twisting a plurality of filaments weakly and a single twisted yarn obtained by twisting a plurality of filaments at a time. It can be set as the structure which becomes.

  According to this, since it is a twist yarn of a sweet twist, the binding force due to the entanglement between the filaments is weak, and the flattening easily occurs. Furthermore, since it is a single-twisted twisted yarn, the binding force due to the entanglement between the filaments is weak compared to a twisted yarn with two twists (twist yarn), such as twists and twists. It becomes easy.

  In the papermaking felt, as shown in claim 8, the second direction yarn is made of a sweet twisted yarn in which a plurality of filaments are weakly twisted, and the number of twists of the twisted yarn is 10 times / m to 150 times. / M.

  If the number of twists is more than 150 times / m, the restraint force due to the entanglement between the filaments is too strong, making it difficult to flatten. On the other hand, if the twist number is less than 10 times / m, the restraint force due to the entanglement between filaments is weak. This may cause the filament to come off when it is squeezed during use, so-called thread dropout may occur. In particular, if there is little bending in the second direction yarn, yarn dropout is likely to occur. Absent.

  The second direction yarn is preferably a twisted yarn in which a plurality of filaments are twisted, but in addition to this, a multifilament yarn (drawn yarn) that is simply a bundle of a large number of filaments or a staple is used. A spun yarn obtained by spinning is also possible.

  Further, it is preferable to use a thread material that is flattened to some extent as the main first direction thread. Specifically, a monofilament thread composed of a single filament with a crimp, or a twisted thread obtained by twisting a plurality of filaments. A twisted yarn of a monofilament yarn and a multifilament yarn in which a plurality of smaller diameter filaments are aggregated, a twisted yarn of a monofilament yarn and a spun yarn obtained by spinning a staple having a smaller diameter than this, and the like are suitable. According to this, it is possible to prevent the first direction yarn from being excessively flattened and to obtain an appropriate cushioning property.

  In the papermaking felt, as shown in claim 9, the second direction yarn can be made of a thermoplastic yarn material that is softened and melted by heat treatment.

  According to this, since the bending of the first direction yarn entangled with the second direction yarn is alleviated, the upper base fabric becomes thinner and flat, and the surface property of the paper can be further improved.

  In the production of the felt, before the needling process for integrating the batt fiber layer with the base fabric layer, a heat set for stabilizing the shape of the base fabric layer is performed. As the heat treatment for softening and melting, a thermoplastic synthetic resin material that softens and melts under the temperature conditions here may be employed.

  In the present invention, as shown in claim 10, in a felt for papermaking in which a bat fiber layer is integrated with a base fabric layer having a multilayer structure, a length direction and a width are formed on a running surface side of the base fabric layer. A base fabric in which warp yarns and weft yarns extending in the respective directions are entangled with each other is disposed, and only the yarn extending in one direction is provided on the surface of the base fabric on the running surface side in the base fabric layer. The yarn layers arranged along the line are arranged, and the one-direction yarns are arranged so as to extend obliquely with respect to the length direction and the width direction.

  According to this, since the yarn layer on the papermaking surface side becomes a thin flat sheet as a whole, the smoothness of the surface of the base fabric layer on the papermaking surface side is improved, and the surface property of the paper can be improved.

  In the base fabric on the running surface side, the warp and weft yarns extend in the length direction and the width direction, respectively, whereas in the yarn layer on the papermaking surface side, the warp and the weft are inclined with respect to the length direction and the width direction. Since the yarn extends and the yarn does not become parallel between the base fabric and the yarn layer, the other yarn is prevented from being fitted between the one yarn, and it is difficult to be crushed. For this reason, it is possible to maintain an appropriate amount of voids over a long period of time, and further, the smoothness of the surface of the base fabric layer on the papermaking surface side is improved, improving the surface property of the paper and reducing the surface property. Can be suppressed.

  In the papermaking felt, as shown in claim 11, the angle formed between the extending direction of the yarn extending in one direction constituting the yarn layer and each of the length direction and the width direction is 10 degrees or more, respectively. It can be configured.

  According to this, it is possible to surely avoid the inconvenience that the yarn of the yarn layer is easily crushed by being fitted between the yarns of the base fabric. When the angle of the yarn layer with respect to the length direction and the width direction of the yarn is less than 10 degrees, the yarn of the yarn layer is fitted between the yarns of the base fabric, which causes a disadvantage of being easily crushed.

  Further, in the present invention, as a method for producing the papermaking felt, as shown in claim 12, a woven fabric woven using a soluble yarn material that is soluble in a predetermined liquid in either one of the warp and the weft. The cloth is overlapped with the base fabric on the running surface side, and the bat fiber layer is integrated by needling, and then the soluble thread material is eluted and removed in the liquid, extending in one direction. It can be set as the structure which forms the said thread | yarn layer only of the thread | yarn to perform.

  According to this, it is possible to easily form a yarn layer only of yarns extending in one direction.

  In this case, the soluble yarn material is preferably made of a water-soluble polymer material from the viewpoint of ease of handling, and the water-soluble yarn material is eluted in the washing water in the washing step performed after the needling step. Should be removed. The soluble yarn material may be made of a polymer material that can be dissolved in an organic solvent, and the organic solvent is chemically stable and brittle with respect to felt constituent materials (polyamide, wool, etc.). Adopt one that does not adversely affect

  As described above, according to the present invention, since the base fabric or yarn layer on the papermaking surface is thin and flat as a whole, the smoothness of the surface on the papermaking surface side of the base fabric layer is improved, and the surface property of the paper is improved. Can be made. Moreover, since it is not necessary to increase the yarn density using a thin thread material, the production is easy. In particular, by arranging the first direction yarns so as to extend obliquely with respect to the length direction and the width direction, the base fabric layer is less likely to be crushed. be able to.

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

  FIG. 1 is a schematic cross-sectional view showing an example of a felt according to the present invention. This felt is formed by laminating a batt fiber layer 2 on a base fabric layer 1 by needling, and the base fabric layer 1 includes a lower base fabric 11 on the running surface 3 side and an upper base fabric on the papermaking surface 5 side. 15 has a multilayer structure.

  The lower base fabric 11 on the traveling surface 3 side has a warp double structure in which wefts 13 extending in the width direction are entangled with two warp yarns 12 extending in the length direction arranged in the thickness direction. There is no. The upper base fabric 15 on the papermaking surface 5 side is woven separately from the lower base fabric 11 and has a single weft structure in which wefts 17 extending in the width direction are entangled with warps 16 extending in the length direction. Yes.

  As the warp yarn 12 and the weft yarn 13 of the lower base fabric 11, a monofilament yarn or a twisted yarn obtained by twisting a plurality of filaments may be used.

  In the example of FIG. 1, the lower base fabric 11 has a warp double structure, but various tissue structures such as a warp single structure as described later are possible.

  FIG. 2 shows an example of the combination of the structure of the lower base fabric and the upper base fabric shown in FIG. The upper base fabric 15 has a structure in which one of the warp yarn 16 and the weft yarn 17 (first direction yarn) passes through the surface side more than the other yarn (second direction yarn), and the first direction yarn. Has a structure mainly composed of first direction yarns arranged with a high density and thicker than the second direction yarns.

  As shown in FIG. 2, the upper base fabric 15 has a lower streak mark in the warp direction and the weft direction depending on which of the warp 12 and the weft 13 is claimed by the lower base fabric 11. In addition, one of a warp-based structure and a weft-based structure is selected.

  That is, when the lower base fabric 11 has a weaving structure claimed by the weft 13 and a streak mark in the weft direction appears strongly, adopting the weaving structure claimed by the warp 16 on the upper base fabric 15 makes the weft direction streaks. The shape mark can be reduced. On the other hand, when the lower base fabric 11 has a woven structure claimed by the warp yarn 12 and a streak mark in the warp direction appears strongly, adopting the woven structure claimed by the weft yarn 17 on the upper base fabric 15 The streak marks in the warp direction can be reduced.

  Here, as an example of a warp-based structure, 5/1 break weaving, that is, after the weft 17 passes through the lower side (running surface side) of the five warp yarns 16, the upper side of the single warp yarn 16 (the papermaking side). In this structure, the proportion of warp yarn (first main direction yarn) 16 passing through the surface side is higher than that of weft yarn (second main direction yarn) 17. . Further, the density (number of inclusions) of the warps 16 is high, and the density of the wefts 17 is low.

  Also, as an example of the weft-based structure, 1/2 weave, that is, the weft 17 passes the lower side (running side) of one warp 16 and then the upper side (paper side) of the two warps 16 is formed. In this structure, the ratio of passing the weft (first main direction thread) 17 through the surface side is higher than that of the warp (second main direction thread 16). Further, the density of the weft 17 is high and the density of the warp 16 is low.

  When the lower base fabric 11 is 2/2 oblique weave and 2/2 break weave as shown in (A), neither the warp 12 nor the weft 13 is claimed. Either a break weave or a 1/2 break weave mainly composed of weft may be used. Further, when the lower base fabric 11 has a 3/1 collapsed weave as shown in (B) and a 5/1 collapsed weave as shown in (D), the warp 12 has the textured structure. No. 15 is preferably a 1/2 weaving weave mainly. On the other hand, if the lower base fabric 11 has a 1/3 broken weave as shown in (C) and a 1/5 collapse weave as shown in (E), the weft 13 has the structure claimed, so the upper base fabric No. 15 is preferably a warp-based 5/1 break weave.

  In addition, since the lower base fabric 11 is warp 1.5 double weave as shown in (F) and weft 1.5 double weave as shown in (G), neither warp 12 nor weft 13 is claimed. The upper base fabric 15 may be either a warp-based 5/1 break weave or a weft-based 1/2 break weave. In addition, there are various types of warp 1.5 weave and weft 1.5 double weave. However, since neither warp 12 nor weft 13 is claimed, the upper base fabric 15 is made of 5 / Either 1 break weaving or 1/2 weaving mainly 1/2 weaving may be used.

  In addition, when the lower base fabric 11 has a warp double weave as shown in (H), the warp 12 has a structure that the warp 12 insists. . On the other hand, when the lower base fabric 11 has a weft double weaving structure as shown in (I), the weft 13 has an asserted structure. Therefore, the upper base fabric 15 is preferably a warp-based 5/1 break weave. . There are various types of warp double weaves and weft double weaves. However, since any warp double weave has an organizational structure claimed by the warp yarn 12, the upper base fabric 15 is composed mainly of weft yarns. / 2 break weaving is preferable, and any weft double weaving has the structure claimed by the weft 13, and therefore the upper base fabric 15 is preferably a warp-based 5/1 break weaving.

  FIG. 3 shows an example of the thickness and the number (density) of threads used for the upper base fabric shown in FIG. The warp yarns 16 and the weft yarns 17 of the upper base fabric 15 are preferably set as shown in FIG.

  Of the warp yarn 16 and the weft yarn 17, the first direction yarn as a main body is made of a thick yarn material, and is woven at a high density (number of inclusions). On the other hand, the second direction yarn that is not the main body is made of a thin yarn material and is woven at a low density (number of inclusions).

  In addition, a monofilament yarn can be used as the second direction yarn that is not the main body, but an aggregate yarn material in which a plurality of either one or both of staples and filaments are gathered may be used. The first direction in which the directional yarn is flattened at the intersection with the first direction yarn, that is, the yarn constituting the aggregate yarn material spreads in the lateral direction along the first direction yarn, and is entangled with the second direction yarn. Yarn bending can be relaxed. According to this, the upper base fabric 15 becomes thin and flat, and the surface property of the paper can be further improved.

  Here, in order to make the aggregate yarn material flattened, it is necessary that the binding force due to the entanglement between the yarns is relatively weak. Specifically, the twist is formed by bundling a large number of filaments. Multi-filament yarns (drawn yarns) that are free of twist, sweet-twisted yarns in which a plurality of filaments are weakly twisted, and spun yarns obtained by spinning staples are suitable.

  In the example shown in FIG. 3, the second direction yarn includes (I) a multifilament yarn of 800d or less (drawn yarn or twisted yarn) made of 6 to 50d filaments, (II) a monofilament yarn of φ0.25 mm or less, (III A spun yarn of 800 d or less, (IV) a water-soluble yarn of 800 d or less, for example, a yarn formed of PVA (polyvinyl alcohol).

  In particular, the second direction yarn is preferably made of a sweet-twisted yarn obtained by twisting a plurality of filaments weakly. According to this, the binding force due to the entanglement between the filaments is weak, and the second direction yarn is easily flattened. . Furthermore, the second direction yarn is preferably composed of a single twisted yarn obtained by twisting a plurality of filaments at a time, and according to this, the twist is doubled by an upper twist and a lower twist as in various twists (twist yarn). Compared with the twisted yarn applied to the wire, flattening is facilitated because the binding force due to the entanglement between the filaments is weak.

  Further, the number of twists of the twisted yarn that becomes the second direction yarn is preferably 10 times / m to 150 times / m. If the number of twists is more than 150 times / m, the restraint force due to the entanglement between the filaments is too strong, making it difficult to flatten. On the other hand, if the twist number is less than 10 times / m, the restraint force due to the entanglement between filaments is weak. This may cause the filament to come off when it is squeezed during use, so-called thread dropout may occur. In particular, if there is little bending in the second direction yarn, yarn dropout is likely to occur. Absent.

  As described above, the upper base fabric 15 has a ratio in which the first direction yarn (one of the warp yarn 16 and the weft yarn 17) passes through the paper surface side compared to the second direction yarn (the other of the warp yarn 16 or the weft yarn 17). If the structure is mainly made of the first direction yarns with a high structure and the first direction yarns are thicker than the second direction yarns and are densely arranged, the second direction yarns do not claim, that is, the upper base fabric 15 is similar to a structure in which only yarns extending in one direction (first direction yarns) are densely arranged along the surface of the lower base fabric 11, and the upper base fabric 15 is thin and flat as a whole. Therefore, the smoothness of the surface on the papermaking surface 5 side of the base fabric layer 1 is improved, and the surface property of the paper can be improved.

  Since the upper base fabric 15 is in a thin and flat state, there is not much increase in the amount of voids due to the overlapping of the upper base fabric 15, and an appropriate void amount is ensured by the lower base fabric 11.

  On the other hand, it is possible to use monofilament yarn for the first direction yarn, but as with the second direction yarn 17, it is better to flatten to some extent using an aggregate yarn material. Monofilament yarn with a single filament with a twist, a twisted yarn in which a plurality of filaments are twisted together, a twisted yarn of a monofilament yarn and a multifilament yarn in which a plurality of smaller diameter filaments are assembled, a monofilament yarn and a staple having a smaller diameter than this A twisted yarn with a spun yarn obtained by spinning is preferred. According to this, it is possible to prevent the first direction yarn from being excessively flattened and to obtain an appropriate cushioning property.

  In the example shown in FIG. 3, (A) a twisted yarn obtained by twisting three filaments having a diameter of 0.15 mm and (B) a twisted yarn obtained by twisting two filaments having a diameter of 0.15 mm are twisted in the first direction yarn. (C) a twisted yarn in which two filaments having a diameter of 0.20 mm are twisted together, (D) a twisted yarn in which three filaments having a diameter of 0.20 mm are twisted, and (E) a twisted yarn in which two filaments having a diameter of 0.20 mm are twisted. Are used, and twisted yarns of (F) 6 to 50d and twisted yarns of 1500d or less and spun yarns (G) of 1500d or less.

  Moreover, you may make it use a thermoplastic thread | yarn material for the 2nd direction thread | yarn which is not a main body. If it does in this way, it can soften and melt | dissolve by heat processing, the bending of the 1st direction thread | yarn which entangles with the 2nd direction thread | yarn can be relieve | moderated, Thereby, the upper base fabric 15 will be in a thin and flat state, The surface property can be further improved.

  In the manufacture of the felt for papermaking, a heat set for stabilizing the form of the base fabric layer 1 is performed before the needling process for integrating the batt fiber layer 2 with the base fabric layer 1. As the heat treatment for softening and melting the second direction yarn, a thermoplastic synthetic resin material that is softened and melted under the temperature conditions here may be employed.

  FIG. 4 is a schematic perspective view showing another example of the felt according to the present invention, and shows a section cut in the length direction and the width direction. FIG. 5 is a schematic plan view showing the upper base fabric and the lower base fabric shown in FIG. 4, wherein (A) shows the upper base fabric and (B) shows the lower base fabric.

  In the example shown in FIG. 1, the warp 16 and the weft 17 extend in the length direction and the width direction in the upper base fabric 15 constituting the base fabric layer 1, respectively, whereas in the example shown in FIG. In the upper base fabric 42 constituting the base fabric layer 41, the first direction thread 43 and the second direction thread 44 extend obliquely with respect to the length direction and the width direction, that is, with respect to the length direction and the width direction. They are arranged so that they are not parallel or orthogonal. The lower base fabric 11 is the same as the example of FIG.

  Thus, the warp 12 and the weft 13 extend in the length direction and the width direction in the lower base fabric 11, respectively, while the upper base fabric 42 is inclined with respect to the length direction and the width direction. Since the first direction yarn 43 and the second direction yarn 44 extend to the lower base fabric 11 and the upper base fabric 42, the other yarn is prevented from being fitted between the one yarn. Therefore, it is difficult to collapse. For this reason, it is possible to maintain an appropriate amount of voids over a long period of time, and further, the smoothness of the surface of the base fabric layer 41 on the papermaking surface 5 side is improved. Can be suppressed.

  Even in this configuration, the structure of the upper base fabric 42 and the lower base fabric 11, the thickness and the number (density) of the first direction threads 43 and the second direction threads 44 of the upper base fabric 42 are shown in FIG. It may be set according to the conditions shown in FIG.

  6 is a schematic plan view illustrating another example of the upper base fabric illustrated in FIG. 4. Here, the angle β1 formed by the extending direction of the first direction thread 43 as the main body and the width direction is smaller than the angle β1 in the example of FIG. As described above, the angle β1 with respect to the width direction of the first direction thread 43 may be reduced. However, in order to obtain characteristics that are difficult to be crushed, the angles α1 and β1 with respect to the length direction and the width direction of the main first direction thread 43 are set. It should be 10 degrees or more. If the angles α1 and β1 are less than 10 degrees, the warp 12 and the weft 13 of the lower base fabric 11 affect the first direction thread 43 of the upper base fabric 42, that is, the gap between the warp yarns 12 of the lower base fabric 11 or Since the first direction thread 43 of the upper base fabric 42 fits into the gap between the wefts 13, the inconvenience of being easily crushed arises.

  On the other hand, the angles α2 and β2 with respect to the length direction and the width direction of the second direction yarn 44 that is not the main body are preferably 10 degrees or more. Here, since the first direction yarn 43 and the second direction yarn 44 are orthogonal to each other, the angles α2 and β2 of the second direction yarn 44 are automatically determined according to the angles α1 and β1 of the first direction yarn 43.

  FIG. 7 is a schematic view showing a procedure for manufacturing the upper base fabric shown in FIGS. 4 and 5. Here, the upper base fabric 42 is formed by arranging a plurality of end woven fabric pieces 71 in the length direction. The woven fabric piece 71 is obtained by cutting the raw fabric 73 woven by the loom 72, and the weft 75 and the warp 74 that become the first direction yarn 43 and the second direction yarn 44 are in the length direction and the width direction. Then, the woven fabric pieces 71 are sequentially arranged in an inclined state so as to extend diagonally, and an excess portion is cut out so that the ears are straight in the length direction.

  If it does in this way, the base fabric 42 distribute | arranged so that the 1st direction thread | yarn 43 and the 2nd direction thread | yarn 44 thread may extend diagonally with respect to the length direction and the width direction can be obtained easily. In addition, since the raw fabric cloth 73 from which the woven cloth piece 71 is based only needs to have a small width dimension, weaving is facilitated.

  In order to increase the strength, the woven cloth pieces 71 arranged in the length direction may be joined together. In this case, the woven cloth pieces 71 may be joined by sewing with a sewing machine or an ultrasonic welding machine. It may be carried out by welding with an adhesive or adhesive with an adhesive.

  FIG. 8 is a schematic perspective view showing another example of the felt according to the present invention, and shows a section cut in the length direction and the width direction. FIG. 9 is a schematic plan view showing the upper base fabric shown in FIG. 8, wherein (A) shows a completed state, and (B) shows a manufacturing procedure.

  As shown in FIG. 8 and FIG. 9A, in the base fabric layer 81, only the main first direction thread 83 in the upper base fabric 82 on the papermaking surface 5 side is oblique with respect to the length direction and the width direction. The second direction yarns 84 that are not the main body are arranged so as to extend in the length direction.

  In this configuration, since the second direction yarn 84 extends in the length direction, there is a concern that the second direction yarn 84 may be easily crushed by fitting into the gap between the warp yarns 12 of the lower base fabric 11. Since the second direction yarns 84 are thinner than the first direction yarns 83 and are arranged at a low density, the second direction yarns 84 are not crushed by being fitted into the gaps between the warp yarns 12 of the lower base fabric 11. It doesn't matter much.

  As shown in FIG. 9 (B), the upper base fabric 82 is an original fabric in which the second direction yarn 84 is woven as warp yarn 92 on the loom, and the first direction yarn 83 is woven as weft (driving yarn) 93 on the loom. The anti-woven fabric 91 is distorted so that the extending direction of the weft thread 93 (first direction thread 83) is oblique to the width direction while the warp thread 92 (second direction thread 84) extends in the length direction. It can be easily obtained. Here, since the warp yarn 92 (second direction yarn 84) is roughly arranged on the raw fabric 91, the operation of distorting the weft yarn 93 (first direction yarn 83) so as to be inclined is easily performed. be able to.

  Even in this configuration, the structure of the upper base fabric 82 and the lower base fabric 11, the thickness and the number (density) of the first direction yarn 83 and the second direction yarn 84 of the upper base fabric 82 are shown in FIG. It may be set according to the conditions shown in FIG.

  FIG. 10 is a schematic perspective view showing another example of the felt according to the present invention, and shows a section cut in the length direction and the width direction. FIG. 11 is a schematic plan view showing the yarn layer on the running surface side and the base fabric on the paper making surface side shown in FIG. 10, wherein (A) shows the yarn layer on the running surface side, and (B) shows the paper making surface. Each side fabric is shown.

  Here, similar to the above example, the base fabric layer 101 has a multilayer structure. However, unlike the above example, only the yarn 102 extending in one direction on the papermaking surface 5 side is disposed on the papermaking surface side. A thread layer 103 arranged along the surface of the base fabric 11 is disposed, and the thread 102 in one direction is arranged so as to extend obliquely with respect to the length direction and the width direction.

  For the yarn 102 of the yarn layer 103, a monofilament yarn or a twisted yarn obtained by twisting a plurality of filaments may be used.

  In this configuration, since the yarn layer 103 becomes a thin flat sheet as a whole, the smoothness of the surface of the base fabric layer 101 on the papermaking surface 5 side is improved, and the surface property of the paper can be improved.

  In the base fabric 11, the warp yarns 12 and 13 and the weft yarn 13 extend in the length direction and the width direction, respectively, whereas in the yarn layer 103, the yarn 102 is inclined with respect to the length direction and the width direction. And the base fabric 11 and the yarn layer 103 do not become parallel to each other, so that the other yarn is prevented from being fitted between the one yarn, and the base fabric layer 101 does not easily collapse. For this reason, it is possible to maintain an appropriate amount of voids over a long period of time, and further, the smoothness of the surface of the base fabric layer 101 on the papermaking surface 5 side is improved, thereby improving the surface property of the paper and improving the surface property. Can be suppressed.

  In this case, the angles α and β of the yarn layer 103 with respect to the length direction and the width direction of the yarn 102 are preferably 10 degrees or more. If the angle is less than 10 degrees, the yarn 102 of the yarn layer 103 is affected by the warp yarn 12 and the weft yarn 13 of the base fabric 11, that is, the yarn layer 103 in the gap between the warp yarns 12 of the base fabric 11 or the gap between the weft yarns 13. This causes a disadvantage that the yarn 102 is easily crushed.

  By the way, the yarn layer 103 including only the yarn 102 extending in one direction is formed while fixing a proper position of the yarn 102 to the base fabric 11 by adhesion with an adhesive or welding by an ultrasonic welding machine, and thus, it is troublesome to manufacture. Cost.

  On the other hand, in the examples shown in FIGS. 4 and 5 and FIGS. 8 and 9, the water-soluble yarn material made of the water-soluble polymer material such as PVA (polyvinyl alcohol) on the second directional yarns 44 and 84 which are not the main body. When the second directional yarns 44 and 84 are eluted and removed in the washing water in the washing step, the same ones as shown in FIGS. 10 and 11 can be obtained.

  The cleaning process for removing the water-soluble second direction yarns 44 and 84 may be performed after the needling process. That is, after a woven fabric woven using a water-soluble yarn material for either one of the warp and the weft is overlaid on the base fabric 11 on the papermaking surface side, and the bat fiber layer 2 is integrated by needling, By eluting and removing the water-soluble thread material by washing in the washing water, the thread layer 103 of only the thread extending in one direction is formed, and the thread layer 103 is in a woven fabric state during the production. Easy to manufacture.

  The water-soluble polymer material forming the water-soluble yarn material may be one that dissolves in water at room temperature, but it is desirable to employ one that dissolves in water heated to 40 ° C to 70 ° C, As a result, it is possible to avoid dissolution of the water-soluble thread material during normal operation, and handling becomes easy.

  The felt for papermaking according to the present invention has an effect of improving the surface property of paper, and the felt for papermaking in which bat fiber layers are integrated on the surface or both front and back surfaces of a base fabric layer having a multilayer structure, In particular, it is useful as a press felt used in a press part (squeezing part) of a paper machine.

It is typical sectional drawing which shows an example of the felt by this invention. It is a figure which shows an example of the combination of the structure | tissue structure of the lower base fabric and upper base fabric shown in FIG. It is a figure which shows an example of the thickness of the thread | yarn used for the upper base fabric shown in FIG. 1, and the number of inclusions (density). It is a typical perspective view which shows another example of the felt by this invention. FIG. 5 is a schematic plan view showing an upper base fabric and a lower base fabric shown in FIG. 4. It is a typical top view which shows another example of the upper base fabric shown in FIG. It is a schematic diagram which shows the point of manufacture of the upper base fabric shown to FIG. 4, FIG. It is a typical perspective view which shows another example of the felt by this invention. It is a typical top view which shows the upper base fabric shown in FIG. It is a typical perspective view which shows another example of the felt by this invention. It is a typical top view which shows the yarn layer by the side of a running surface shown in FIG. 10, and the base fabric by the side of papermaking.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base fabric layer 2 Butt fiber layer 3 Running surface 5 Paper making surface 11 Lower base fabric, 12 Warp, 13 Weft 15 Upper base fabric, 16 Warp (first direction yarn or second direction yarn), 17 Weft (first direction yarn) Or second direction thread)
41 base fabric layer 42 base fabric, 43 first direction yarn, 44 second direction yarn 71 woven fabric piece 72 loom 73 original fabric woven fabric, 74 warp yarn, 75 weft 81 base fabric layer 82 base fabric, 83 first direction yarn, 84 Second direction yarn 91 Raw fabric 101 Base fabric layer 102 Yarn 103 Yarn layer

Claims (12)

A felt for papermaking in which a batt fiber layer is integrated with a base fabric layer having a multilayer structure,
On the running surface side in the base fabric layer, a lower base fabric in which warps and wefts extending in the length direction and the width direction are entangled with each other is arranged,
A first direction yarn and a second direction yarn that are woven separately from the lower base fabric and extend in the first direction and the second direction, respectively, are entangled with each other on the papermaking surface side of the base fabric layer. An upper base fabric is disposed, and the upper base fabric has a structure in which the ratio of the first direction yarn passing through the papermaking surface side is higher than that of the second direction yarn, and the first direction yarn is the second direction. A felt for papermaking, characterized in that it has a structure mainly composed of first direction yarns arranged densely with a thicker yarn material than yarns.   2. The papermaking felt according to claim 1, wherein at least the first direction yarns are arranged so as to extend obliquely with respect to the length direction and the width direction.   The papermaking felt according to claim 2, wherein the angle formed between the extending direction of the first direction yarn of the upper base fabric and each of the length direction and the width direction is 10 degrees or more.   The upper base fabric is formed by cutting, as necessary, a piece of woven fabric obtained by cutting an original fabric woven by a loom into warps and wefts serving as the first direction yarn and the second direction yarn. 4. The papermaking felt according to claim 2, wherein a plurality of the felts are arranged in the length direction in an inclined state with respect to the length direction and the width direction.   The upper base fabric is a raw fabric woven by a loom, and the yarn serving as the first direction yarn is oblique to the width direction while the yarn serving as the second direction yarn is extended in the length direction. The papermaking felt according to claim 2 or 3, wherein the felt for papermaking is formed to be distorted so as to extend.   The said 2nd direction thread | yarn consists of an aggregate thread | yarn material which aggregated one or both of the staple and the filament so that it may become flat at the cross | intersection part with a 1st direction thread | yarn. The papermaking felt according to any one of claims 5 to 5.   The paper for papermaking according to claim 6, wherein the second direction yarn is composed of a sweet twist obtained by twisting a plurality of filaments weakly and a single twisted yarn obtained by twisting a plurality of filaments at a time. felt.   The said 2nd direction thread | yarn consists of the twist thread of the sweet twist which twisted together several filaments weakly, The twist number of the twist thread | yarn was 10 times / m-150 times / m, It is characterized by the above-mentioned. Papermaking felt.   The papermaking felt according to any one of claims 1 to 5, wherein the second direction yarn is made of a thermoplastic yarn material that is softened and melted by heat treatment. A felt for papermaking in which a batt fiber layer is integrated with a base fabric layer having a multilayer structure,
On the running surface side of the base fabric layer, a base fabric in which warps and wefts extending in the length direction and the width direction are entangled with each other is disposed,
A yarn layer formed by arranging only yarns extending in one direction along the surface of the base fabric on the traveling surface side is disposed on the papermaking surface side of the base fabric layer, and the yarns in the one direction are in the length direction. And a felt for papermaking, which is arranged so as to extend obliquely with respect to the width direction.   11. The papermaking felt according to claim 10, wherein an angle formed by an extending direction of the yarn extending in one direction constituting the yarn layer and each of the length direction and the width direction is 10 degrees or more. . It is a manufacturing method of the felt for paper manufacture of Claim 10,
A woven fabric woven using a soluble yarn material that can be dissolved in a predetermined liquid in either warp or weft is overlaid on the base fabric on the running surface side, and the bat fiber layer is integrated by needling. The method for producing a felt for papermaking is characterized in that the soluble yarn material is eluted and removed in the liquid to form the yarn layer of only yarn extending in one direction.

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