JP2011021310A - Nonwoven fabric and method for producing the same, and wiping material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nonwoven fabric having both high designability and good functional properties, a method for producing the same, and a wiping material using the nonwoven fabric. <P>SOLUTION: The nonwoven fabric providing a stripe pattern is formed by rearranging a part of structural fibers of a fiber aggregate by hydroentanglement to have a plurality of stripes which includes a regular pattern and also mutually separated. The nonwoven fabric has groups of stripes in which stripes A and stripes B are alternately arranged, and the groups of the stripes are more than one and mutually separated. The nonwoven fabric also has a stripe C between a pair of adjacent groups of the stripes, wherein the stripes A, stripe B and stripe C are different in patterns from the adjacent stripes and the stripes A and/or the stripes B have the regular pattern. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a nonwoven fabric, a method for producing the same, and a wiping material.

  Conventionally, in order to give various functions to a nonwoven fabric, a nonwoven fabric provided with a pattern or the like according to the application has been proposed. Among them, various proposals have been made for non-woven fabrics having stripes in which the patterns are separated from each other. For example, Patent Document 1 discloses a nonwoven fabric in which a region A having a small area of openings and a region B having a large area of openings are alternately provided in one direction in the nonwoven fabric. Further, Patent Document 2 discloses a nonwoven fabric in which 1 to 4 aperture rows in which through holes are continuously connected and non-perforated rows are alternately present. Patent Document 3 discloses a nonwoven fabric wiper made of a nonwoven fabric in which substantially flat portions and striped portions are alternately present.

Japanese Patent Application Laid-Open No. 8-99459 JP 2000-45161 A Japanese Patent Laid-Open No. 2003-508

  However, in the nonwoven fabric disclosed in Patent Document 1, the width of the stripes of the region A and the region B are each formed constant, and when used as a wiping material, the wiping target is wiped concentrated at the edge of the nonwoven fabric. In some cases, the wiping ability at the central portion of the nonwoven fabric is not fully exhibited and discarded.

  In addition, the nonwoven fabric disclosed in Patent Document 2 also has a uniform width of the stripes of the aperture row and the non-aperture row, and when used as a wiping material, the wipe is concentrated on the edge of the nonwoven fabric. An object may be wiped off, and may be discarded without fully exhibiting the wiping ability at the central portion of the nonwoven fabric.

  In addition, the nonwoven fabric disclosed in Patent Document 3 is merely one in which the striped portion is clearly formed with the nozzle streaks due to hydroentanglement as a recess, and the design and wiping properties as a stripe pattern are not sufficient. Further, since there are 5 / cm or more of convex portions forming the striped portion, the width of each convex portion and the concave portion is about 1 mm, and the formation of the concave and convex portion itself so that it can be visually discerned, It was difficult.

  In this invention, the nonwoven fabric which has high designability and favorable functionality (for example, wiping off etc.), its manufacturing method, and the wiping material using the said nonwoven fabric are provided.

  The nonwoven fabric of the present invention is formed by rearranging some of the constituent fibers of the fiber assembly by hydroentanglement, has a regular pattern, and has a plurality of stripes spaced apart from each other, thereby exhibiting a stripe pattern. A non-woven fabric having stripe groups in which stripes A and B are alternately arranged, the stripe groups being spaced apart from each other, and having a stripe C between a pair of adjacent stripe groups, The stripe A, the stripe B, and the stripe C have a pattern different from the pattern of adjacent stripes, and the stripe A and / or the stripe B have a regular pattern.

  In the method for producing a nonwoven fabric of the present invention, a part of the constituent fibers of the fiber assembly is hydroentangled on a predetermined support having a regular pattern, whereby a plurality of the constituent fibers are rearranged. And stripes A and B are adjacent to each other, and a stripe group in which stripes A and B are alternately arranged, and a plurality of stripe groups spaced apart from each other, a stripe C is adjacent to each other. The method includes a step of forming a stripe pattern having a pattern different from a pattern of matching stripes, and the stripe A and / or the stripe B having a regular pattern.

  The wiping material of the present invention includes the nonwoven fabric of the present invention.

  ADVANTAGE OF THE INVENTION According to this invention, the nonwoven fabric which has high designability and favorable functionality (for example, wiping off property) characteristics, and its manufacturing method can be provided.

  Moreover, since the wiping material using the said nonwoven fabric contains the stripe which has a different pattern with a predetermined arrangement | sequence, favorable wiping off property can be provided.

Drawing 1 is a key map showing an example of the nonwoven fabric of the present invention. FIG. 2 is a conceptual diagram showing another example of the nonwoven fabric of the present invention. FIG. 3 is a conceptual diagram showing another example of the nonwoven fabric of the present invention. FIG. 4 is an enlarged schematic view showing an example of a regular pattern of the nonwoven fabric of the present invention. FIG. 5 is an enlarged schematic view showing another example of the regular pattern of the nonwoven fabric of the present invention. FIG. 6 is an enlarged schematic view showing another example of the regular pattern of the nonwoven fabric of the present invention. FIG. 7 is a conceptual diagram showing an example of an array of orifices used in the method for producing a nonwoven fabric of the present invention. FIG. 8 is a conceptual diagram showing another example of the nonwoven fabric of the present invention. FIG. 9 is a conceptual diagram showing another example of the nonwoven fabric of the present invention. FIG. 10 is a conceptual diagram showing another example of the arrangement of orifices used in the method for producing a nonwoven fabric of the present invention.

  The nonwoven fabric of the present invention is formed by rearranging some of the constituent fibers of the fiber assembly by hydroentanglement, has a regular pattern, and has a plurality of stripes spaced apart from each other, thereby exhibiting a stripe pattern. A non-woven fabric having a stripe group in which stripes A and B are alternately arranged, and a plurality of the stripe groups, the stripe groups being separated from each other, and between a pair of adjacent stripe groups The stripe C, the stripe A, the stripe B, and the stripe C have a pattern different from the pattern of the adjacent stripe, and the stripe A and / or the stripe B have a regular pattern.

  In the present invention, a stripe is a structural unit constituting a stripe pattern. In the nonwoven fabric of the present invention, a stripe group in which stripes A and stripes B having a different pattern from the stripe A are alternately formed is formed, and a plurality of stripe groups are present apart from each other. One or more stripes A and stripes B are included in one stripe group. The number of stripes A and the number of stripes B included in one stripe group may be the same, or the number of stripes A may be larger or smaller than the number of stripes B. When the number of stripes A and / or the number of stripes B included in one stripe group is n, it is preferable that 2 ≦ n ≦ 7. A more preferable upper limit value of the number n of stripes A and / or stripes B is 5. If the upper limit n of the number n of stripes A and / or stripes B exceeds 7, the nonwoven fabric in which stripes A and stripes B are alternately arranged may be indistinguishable in terms of design or wiping properties. If the number of stripes A and / or stripes B included in one stripe group is large, the wiping property may be improved, which is preferable. As long as the number of stripes A and / or stripes B satisfies n (2 ≦ n ≦ 7), each stripe group existing in the nonwoven fabric has the same number of stripes A and / or stripes B. It may be possible to have a different number. It is preferable that each stripe group present in the nonwoven fabric has the same number of stripes A and / or stripes B, since a nonwoven fabric having uniform design and functionality can be obtained.

  For example, when the number of stripes A included in one stripe group is larger than the number of stripes B, when the number of stripes A is two and the number of stripes B is one, stripe A / stripe B Stripe A and stripe B are alternately arranged in the order of / stripe A to form a stripe group.

  The width of the stripe group is preferably 6 to 75 mm. A more preferred lower limit is 9 mm, and a more preferred lower limit is 12 mm. Moreover, a more preferable upper limit is 60 mm, a still more preferable upper limit is 45 mm, and a still more preferable upper limit is 25 mm. If the width of the stripe group is less than 6 mm, it may be difficult to clearly distinguish the stripe A or stripe B, or the regular pattern of the stripe may be difficult to distinguish, which may be inferior in design. Further, if the width of the stripe group is less than 6 mm, sufficient wiping property may not be obtained. When the width of the stripe group exceeds 75 mm, the stripe group occupies a large number of nonwoven fabrics in actual usage, the number of stripe groups and the number of stripes C become small, and the stripes are formed at equal intervals. It may become indistinguishable from the nonwoven fabric in terms of design or wiping properties. In addition, the width of each stripe group included in the nonwoven fabric may be the same or different as long as it satisfies the range of 6 to 75 mm. It is preferable that the width of each stripe group included in the nonwoven fabric is the same because a nonwoven fabric having uniform design and functionality can be obtained.

  In the nonwoven fabric of the present invention, the width of the stripe A and / or the stripe B is preferably 2 to 25 mm. A more preferable lower limit is 3 mm, and a further preferable lower limit is 4 mm. Moreover, a more preferable upper limit is 20 mm, a still more preferable upper limit is 15 mm, and a still more preferable upper limit is 10 mm. If the width of the stripe A and / or the stripe B is less than 2 mm, it may be difficult to discriminate as a stripe pattern, and it may be difficult to discriminate a regular pattern included in the stripe. Further, if the width of the stripe A and / or the stripe B is less than 2 mm, sufficient wiping property may not be obtained. If the width of the stripe A and / or the stripe B exceeds 25 mm, the design and wiping properties may not function sufficiently when the area of the nonwoven fabric used is small. Further, the widths of the stripes A and / or stripes B constituting the stripe group may be the same or different as long as the range of 2 to 25 mm is satisfied. It is preferable that the stripes A and / or stripes B constituting the stripe group have the same width, because a nonwoven fabric having uniform design and functionality can be obtained.

In the nonwoven fabric of this invention, it has the stripe C between a pair of adjacent stripe groups. The width of the stripe C may be an arbitrary width, but is preferably a width different from the width of the stripe A and / or the stripe B, and more preferably a width different from the width of the stripe A and the stripe B. The width of the stripe C may be larger or smaller than the width of the stripe A and / or the stripe B, but is preferably larger than the width of the stripe A and / or the stripe B. More preferably, the width is larger than the width of the stripe B. The width of the stripe C is different from the width of the stripe A and / or the stripe B, which is different from the stripe A and / or the stripe B included in the stripe group located immediately adjacent to the stripe C. What is necessary is just a width | variety, and it is preferable that the width | variety of all the stripes C differs compared with the width | variety of all the stripes A and / or the stripes B contained in a nonwoven fabric. When the number of stripes A and / or stripes B included in one stripe group is plural, the width of the stripe A and / or stripe B closest to the stripe C is equal to the width of the stripe C. It only has to be different. The preferable lower limit of the width of the stripe C is 2 mm, the more preferable lower limit is 4 mm, the still more preferable lower limit is 6 mm, and the still more preferable lower limit is 10 mm. The stripe C width has a preferable upper limit of 90 mm, a more preferable upper limit of 75 mm, a more preferable upper limit of 50 mm, an even more preferable upper limit of 30 mm, and a still more preferable upper limit of 20 mm. If the width of the stripe C is less than 2 mm, it may be difficult to discriminate as a stripe pattern and the wiping property may be inferior. When the width of the stripe C exceeds 90 mm, the stripe C occupies a large number in the actual usage form, the number of stripe groups and the number of the stripes C become small, and the nonwoven fabric in which the stripes are formed at equal intervals In some cases, the design or wiping property becomes indistinguishable. When the width of the stripe C is larger than the width of the stripe A and / or the stripe B, the width of the stripe C is preferably 4 to 75 mm. In this case, when the width of the stripe C is less than 4 mm, the difference between the width of the stripe A and / or the stripe B is reduced, and the non-woven fabric in which the stripe A and the stripe B are arranged alternately and the design or wiping property. It may become indistinguishable in terms of points. For example, when the number of stripes A included in one stripe group is larger than the number of stripes B and the patterns of stripes B and C are the same, stripe B has a width of less than 4 mm. Since the difference between the width of the stripe and the width of the stripe C is reduced, there is a high possibility that it is difficult to distinguish the non-woven fabric in which the stripes A and B are arranged alternately and the design or wiping property. When the width of the stripe C exceeds 75 mm, the stripe C occupies a large number in the actual usage form, and the number of stripe groups and the number of stripes C become small, and the non-woven fabric in which the stripes are formed at equal intervals In some cases, the design or wiping property becomes indistinguishable. As long as the width of the stripe C satisfies 2 to 90 mm, the width of each stripe C present in the nonwoven fabric may be the same or different. It is preferable that the width of each stripe C existing in the nonwoven fabric is the same because a nonwoven fabric having uniform design and functionality can be obtained. When the number of stripes A included in one stripe group is larger than the number of stripes B and the width of each stripe C present in the nonwoven fabric is different, the minimum width of the stripe C exists in the nonwoven fabric. A width larger than the maximum width of the stripe B included in each stripe group is preferable because it is superior to a nonwoven fabric in which stripes are arranged at equal intervals in terms of design and wiping.

  The stripe C exists between a pair of adjacent stripes. The stripe C may be composed of a single stripe, or two or more as long as the width of the stripe C is 2 to 90 mm. It may be composed of a plurality of stripes. One stripe is preferable. When the stripe C is composed of two or more stripes, adjacent stripes have different patterns (regular patterns or plain patterns). The stripes constituting these stripes C preferably have different widths from the stripes A and B, respectively. More preferably, the width is larger than that of the stripe A and / or the stripe B, and still more preferably larger than the width of the stripe A and the stripe B.

  The nonwoven fabric of the present invention has a stripe group in which the stripe A and the stripe B are alternately arranged. The stripe group includes a plurality of stripe groups, the stripe groups are separated from each other, and a pair of adjacent stripe groups. By having the stripe C between them, it has a high degree of design, which is different from the conventional nonwoven fabric having a stripe pattern arranged at regular intervals, and exhibits excellent wiping properties.

  In the case where the width of the stripe group, stripe A, stripe B, and / or stripe C and the number of stripes A and / or stripes B included in the stripe group are different as described above, excellent design as a nonwoven fabric. Is obtained. Another effect is that when such a non-woven fabric is used as a wiping material, the particle size and type of dust that is easily trapped differ depending on the width and number of each. There is also an effect that you can collect. In addition, as another effect, when using a nonwoven fabric as a wiping material, the particle size and type of dust that is easily trapped vary depending on the width and number of each, so when wiping, floor etc. Dust is not collected intensively at the edge of the wiping surface that is in contact with the surface to be wiped, but the dust tends to migrate to the center of the nonwoven fabric, and as a result, the entire surface of the nonwoven fabric can be used effectively. is there. Moreover, as an example of the nonwoven fabric of the present invention, the width of the stripe group, stripe A, stripe B, and / or stripe C and the number of stripes A and / or stripes B that the stripe group has are each in the longitudinal direction of the stripe. The repeating unit that becomes larger in the direction orthogonal to the direction may be formed by being repeated a plurality of times.

  The ratio between the width of the adjacent stripe A and the width of the stripe B is preferably 0.25 to 3.0. More preferably, it is 0.5-2.0. More preferably, it is 0.7-1.5. When the ratio is less than 0.25, the ratio of the stripe A in the stripe group decreases, and it becomes difficult to distinguish the stripe A, and the design and wiping properties may be inferior. If the ratio exceeds 3.0, the designability may not be good or the wiping property may not be good.

  The ratio between the width of the adjacent stripe group and the width of the stripe C is preferably 0.2 to 8.0. More preferably, it is 0.3-5.0. If the ratio is less than 0.2, the ratio of stripes C in the nonwoven fabric increases, and the design and wiping properties may be inferior. If the ratio exceeds 8.0, the nonwoven fabric in which stripes A and stripes B are alternately arranged may be indistinguishable in terms of design or wiping properties.

  When one stripe group and one adjacent stripe C are made into one set, the total value of the widths of the stripes B and C included in the set, and the total value of the widths of the stripes A The ratio is preferably 1.0 to 9.0. More preferably, it is 1.0-7.0. More preferably, it is 1.0-5.0. When the ratio is less than 1.0, the width of the stripe C becomes small, and the nonwoven fabric in which the stripe A and the stripe B are alternately arranged may be indistinguishable in terms of design or wiping property. If the ratio exceeds 9.0, the proportion of stripes C in the nonwoven fabric increases, and the design and wiping properties may be inferior.

  The nonwoven fabric of the present invention is formed by rearranging some of the constituent fibers of the fiber assembly by hydroentanglement, has a regular pattern, and has a plurality of stripes spaced apart from each other, thereby exhibiting a stripe pattern. Examples of the structural unit constituting the regular pattern include at least one selected from the group consisting of irregularities and apertures. Examples of the pattern include a dot (circle, ellipse, triangle, polygon, etc.) pattern, a herringbone pattern, a checkered pattern, a lattice pattern, a staggered pattern, a spiral net pattern, and a zigzag pattern. However, nozzle streaks due to simple water flow are not included in the regular pattern.

  Each regular pattern has various functions and effects. For example, a dot pattern or the like in which apertures are formed at a predetermined interval contributes to improving the scraping property, and brings about an effect that it becomes difficult to stick to the skin because the contact area becomes small when contacting with the skin. In the herringbone pattern or spiral net pattern, the relatively high density and low density fiber repeats with a small period, so that the capillary phenomenon is likely to occur and the water absorption of the nonwoven fabric is improved. In addition, in the case of the herringbone pattern or spiral net pattern, because it is a pattern formed in an oblique direction with respect to the direction in which the stripe is formed, when used as a wiping material, dust to be wiped off from the edge of the nonwoven fabric It becomes easy to shift to the central part, and brings about an effect that the central part of the nonwoven fabric can be effectively utilized. Therefore, if a plurality of patterns are provided, a nonwoven fabric having a plurality of functions can be provided.

  The stripe A and / or stripe B included in the nonwoven fabric of the present invention has the regular pattern. The stripe A and the stripe B may have the regular patterns different from each other.

  The stripe A, stripe B, and stripe C included in the nonwoven fabric of the present invention have a pattern different from the pattern of adjacent stripes. Since at least the stripes A and B are alternately arranged, the stripes A and B have different patterns.

  As long as the stripe A and / or the stripe B has the regular pattern, the stripes included in the nonwoven fabric of the present invention may be plain. When the pattern of the stripe A is a regular pattern, the pattern of the stripe B may be a pattern different from the pattern of the stripe A, that is, the pattern of the stripe B may be plain, A regular pattern different from the pattern may be used. When the pattern of the stripe B is a regular pattern, the pattern of the stripe A may be plain or a regular pattern different from the pattern of the stripe B. For example, when the number of stripes A included in one stripe group is two, the number of stripes B is one, and the pattern of stripes A has a regular pattern, the pattern of stripe A / stripe B Pattern / stripe A pattern / stripe C pattern may be a regular pattern / solid color / regular pattern / a regular pattern different from the stripe A in order, or a regular pattern. It may be a regular pattern / regular pattern / plain color different from the pattern / stripes A, or may be a regular pattern / plain color / regular pattern / plain color.

  For example, when the number of stripes A included in one stripe group is larger than the number of stripes B (one more), the patterns of stripes B and C may be the same or different. If the patterns of the stripe B and the stripe C are the same, the manufacturing cost can be reduced. When the patterns of the stripe B and the stripe C are different, a nonwoven fabric excellent in design and wiping properties can be obtained.

  In the nonwoven fabric of the present invention, the patterns of the stripes are roughly classified into regular patterns and plain patterns. In this case, the plain pattern is a pattern other than a pattern that is intentionally provided with a regular pattern. However, nozzle lines and texture irregularities that are inevitable in production are distinguished from the regular patterns of the present invention and fall into the plain category. Specifically, when the design is not felt by the naked eye, more specifically, when the longest part is measured with respect to convex portions, concave portions, openings, etc., the length is 0.2 mm or less Falls into the plain category. In addition, even if it has a color pattern, it is plain when a part of the constituent fibers does not have a regular pattern formed by rearrangement by hydroentanglement.

  When the structural unit of the regular pattern is an aperture, if the area of the aperture and the distance w between apertures (see FIGS. 4 and 5) are in the following ranges, the wiping material has an excellent dust collecting property. A suitable nonwoven fabric can be provided. The area of the opening is preferably 0.5 mm2 to 6.0 mm2, and more preferably 3.0 mm2 to 5.5 mm2. The distance between the apertures closest to each other is preferably 1.0 mm to 3.0 mm, and more preferably 1.5 mm to 3.0 mm.

  The longitudinal direction of the stripe in the nonwoven fabric of the present invention may be parallel to either the MD direction or the CD direction, but is preferably parallel to the MD direction. Usually, the tension in the MD direction is applied to the fiber aggregate during the manufacturing process of the nonwoven fabric. Therefore, when the stripe is formed along the MD direction, a desired pattern can be stably formed.

  The value of the ratio of the thickness of the stripe A to the thickness of the stripe B (the thickness of the stripe A / the thickness of the stripe B) is larger because the dust collection performance is further improved when the value is large. When it is large, it is preferably 1.03 or more, more preferably 1.08 or more, and further preferably 1.15 or more. Further, when the thickness of the stripe B is large, the value of the ratio between the thickness of the stripe A and the thickness of the stripe B is preferably 0.97 or less, more preferably 0.92 or less, and 0.87 or less. Is more preferable. Further, although there is no particular limitation on the upper limit of the ratio value (stripe A thickness / stripe B thickness) when the thickness of the stripe A is large, it is preferably 4.0 or less from the viewpoint of ease of production, More preferably, it is 3.0 or less, and further preferably 2.0 or less. Similarly, the lower limit of the ratio value when the thickness of the stripe B is large is preferably 0.25 or more, more preferably 0.33 or more, and more preferably 0.50 or more from the viewpoint of ease of production. More preferably.

  In an example of the nonwoven fabric of the present invention, it is preferable that the constituent fibers include heat-sealing fibers and they are heat-sealed with adjacent fibers. In this case, the shape stability of the nonwoven fabric is improved, and a decrease in thickness due to use is also suppressed. Such a nonwoven fabric is suitable for a wiper because it is difficult to stretch. Therefore, if an example of the nonwoven fabric of the present invention in which the constituent fiber includes a heat-sealing fiber is used, a wiper that is easy to wipe and can be wiped lightly without applying force can be provided. . Such a non-woven fabric is obtained by fusing at least a part of the constituent fibers by heat-treating the fiber assembly after the step of expressing stripes having a predetermined regular pattern, thereby fusing the constituent fibers together. It is done. The constituent fibers preferably contain 5% by mass to 40% by mass of heat-sealing fibers. When the content of the heat-fusible fiber is within the above range, it is possible to provide a non-woven fabric that has good shape stability and little fuzz and is difficult to sway.

  The nonwoven fabric is not limited to a single layer, and may have a laminated structure of two or more layers. For example, when a layer mainly containing split-type conjugate fibers is used as a wiping surface layer (surface layer), and a layer mainly containing hydrophilic fibers is laminated as a layer for retaining a chemical solution, etc., the unique properties of the split-type conjugate fibers, For example, a wet wiper such as a high quality wet wiper, wet tissue, or disposable wet towel capable of maximizing excellent scraping property and flexibility can be provided. In particular, when the nonwoven fabric has a laminated structure of three or more layers and includes a layer mainly containing hydrophilic fibers such as pulp as an intermediate layer, the layer mainly containing hydrophilic fibers becomes a liquid retaining layer, and the liquid is applied to the surface. Since it can be put out gradually, it is preferable. Further, when a layer mainly containing hydrophilic fibers such as pulp is included as an intermediate layer, the pattern of the stripe A becomes clear, which is preferable. Here, “mainly” means that 50% by mass or more of the split-type conjugate fiber is contained as a main component in the layer mainly containing the split-type conjugate fiber, and the hydrophilic fiber is used as the main component in the layer mainly containing the hydrophilic fiber. It means that 50 mass% or more is contained. In the case of a laminated structure of two or more layers, a spunbond nonwoven fabric, a meltblown nonwoven fabric, a spunbond / meltblown / spunbond (SMS) nonwoven fabric, a weft orthogonal nonwoven fabric, a net made of a resin, a fabric such as a scrim, This is preferable because the shape retention of the nonwoven fabric is increased. In particular, it is preferable to have a laminated structure of three or more layers and include the above woven fabric as an intermediate layer. Examples of such spunbond nonwoven fabrics and nets include the Nihonishi Plast Co., Ltd. process-orthogonal non-woven fabric (trade name “Milife”) and the company's process-orthogonal net (product name “Conweed Net”). Can be mentioned. In particular, a background-orthogonal net such as a conweed net is preferred because the shape retention of the nonwoven fabric is high even if the degree of entanglement is low.

  In an example of the nonwoven fabric of the present invention, when the stripe A has a regular pattern as described above, the stripe B and / or the stripe C having a pattern different from the stripe A may be so-called plain or You may have a regular pattern different from a pattern. That is, the stripe pattern as an example of the nonwoven fabric of the present invention may have two or more stripes having different patterns. In this case, it is possible to provide a nonwoven fabric with more excellent design and functionality.

  A nonwoven fabric in which the number of stripes A included in one stripe group is greater than the number of stripes B, the pattern of stripes A has a regular pattern, and the patterns of stripes B and C are plain, For example, it can be formed as follows.

  First, the constituent fibers of the fiber assembly are entangled (hereinafter sometimes referred to as “first entanglement”. The first entanglement has a regular pattern by rearranging the fibers by hydroentanglement (second entanglement). This is performed before forming the stripe pattern by forming a plurality of stripes A). The first entanglement is performed so that the fiber assembly after the entanglement has a so-called plain pattern. Then, after the first entanglement, for example, a predetermined pattern corresponding to the pattern of the support (second entanglement) is made by hydroentanglement (second entanglement) on a support having a predetermined pattern. A plurality of stripes A having a regular pattern are developed to form a stripe pattern. This second entanglement is performed so that the portions other than the stripe A after the entanglement form the stripe B and the stripe C. In this manner, a non-woven fabric including the stripe A having a predetermined pattern and the stripe B and the stripe C having a plain pattern different from the predetermined pattern is obtained. According to this method, a nonwoven fabric excellent in design and wiping properties, which is different from the conventional striped nonwoven fabric aligned at regular intervals, can be obtained by one entanglement treatment (second entanglement).

  In addition, the number of stripes A included in one stripe group is larger than the number of stripes B, the pattern of stripes A has a regular pattern, and the pattern of stripes B and / or stripes C is The nonwoven fabric in the case of a regular pattern different from the pattern can be formed as follows, for example.

  First, the constituent fibers of the fiber assembly are entangled (first entanglement), and then the constituent fibers of the fiber assembly are hydroentangled (first support) on a predetermined support (first support) having a regular pattern. 3), a regular pattern is formed on almost the entire surface of the fiber assembly. Next, a part of the constituent fibers of the fiber aggregate in which the pattern is formed on almost the entire surface is hydroentangled (secondly) on a support (second support) different from the predetermined support (first support). 2), the regular pattern in the part is erased, and a plurality of stripes A having a regular pattern different from the above are developed. At this time, the stripe A is formed so that the portions other than the stripe A form the stripe B and the stripe C.

  Further, after performing the second entanglement so as to express the stripes A, B, and C, the entire surface of the fiber assembly is hydroentangled on the support having a pattern different from the support used in the above step (first 4 entanglement). In this case, the fourth entanglement uses a water flow having a lower water pressure than the high-pressure water flow used in the second entanglement so that the patterns of the stripes A, B, and C cannot be distinguished by the fourth entanglement. Do it. That is, a fiber entangled portion having a relatively regular entanglement and a predetermined regular pattern, and a fiber entangled portion having a relatively weak entanglement and a pattern different from the predetermined regular pattern, each having a predetermined width. Then, a stripe pattern is exhibited.

  As another method, first, the constituent fibers of the fiber assembly are entangled (first entanglement), and then a part of the constituent fibers of the fiber assembly is hydroentangled (fifth) on a support having a predetermined pattern. By entanglement), for example, a plurality of stripes having a predetermined pattern corresponding to the pattern of the support are developed to form a stripe pattern. Subsequently, after this step, a part of the constituent fibers existing between the stripes having the predetermined pattern adjacent to each other in the fiber assembly are placed on the support having a pattern different from the support used in the above step. Hydroentanglement (second entanglement) is performed to develop a pattern different from the predetermined pattern. For example, when the adjacent stripes having the predetermined pattern are plain, the stripe having the predetermined pattern is the stripe C, the stripe having the plain pattern is the stripe B, and the predetermined pattern expressed by the second entanglement A stripe having a pattern different from is a stripe A. Of course, at the time of the second entanglement, the stripe A and the stripe B may be formed by entanglement of some constituent fibers of the stripe having a predetermined pattern. In that case, the plain stripe located between the stripes having a predetermined pattern first becomes the stripe C.

  In addition, the number of stripes A included in one stripe group is larger than the number of stripes B, the pattern of stripes B and / or stripes C has a regular pattern, and the pattern of stripes A is a plain pattern. The nonwoven fabric in some cases can be formed, for example, as follows.

  First, after entanglement (first entanglement) of the constituent fibers of the fiber assembly, a part of the constituent fibers of the fiber assembly is hydroentangled (second entanglement) on a support having a predetermined pattern, for example, A plurality of stripes B and stripes C having a predetermined pattern (regular pattern) corresponding to the pattern of the support are developed to form a stripe pattern. That is, such a non-woven fabric is obtained by entanglement with the high-pressure water flow of the opposite part to the case where the stripe A having the regular pattern described above and the plain stripe B and the stripe C are formed.

  As another method, first, the constituent fibers of the fiber assembly are entangled (first entanglement), and then the fiber assembly is subjected to water flow on a predetermined support (first support) having a regular pattern. A regular pattern is formed on almost the entire surface of the fiber assembly by entanglement (third entanglement). Next, on the same support as that used in the first entanglement, that is, a support capable of forming a plain pattern, a high-pressure water stream is jetted to a part of the fiber assembly, and the constituent fibers of the part While the water is entangled with each other (sixth entanglement), the constituent fibers are rearranged to form a stripe pattern. At this time, the stripe A becomes a plain pattern, and the stripe B and the stripe C become regular patterns.

  As still another method, first, the constituent fibers of the fiber assembly are entangled (first entanglement), and then a part of the constituent fibers of the fiber assembly is flown on the support having a predetermined pattern. By entanglement (second entanglement), the stripe A having the predetermined pattern (regular pattern), the plain stripe B, and the stripe C are formed. Next, a regular pattern different from the predetermined pattern is formed in a portion of the stripe B and a portion of the stripe C and a portion adjacent to the stripe A located at one end of the stripe group adjacent to the stripe C. The stripe A having a predetermined pattern, the stripe B having a regular pattern different from the predetermined pattern, and the plain stripe C are formed by hydroentangling (seventh entanglement) on the support having The At this time, the number of stripes A and the number of stripes B included in one stripe group are the same.

  Further, in the above method, after the fifth entanglement, instead of hydroentangling a part of the constituent fibers existing between the stripes having the adjacent predetermined pattern, in the stripe having the adjacent predetermined pattern A part of the constituent fibers in (1) is hydroentangled (second entangled) on a support having a pattern different from that of the support used in the above step, and a pattern different from the predetermined pattern is expressed. For example, when the adjacent stripes having a predetermined pattern are plain, the stripe having the plain pattern is the stripe C, and the stripes having the predetermined pattern among the stripes having the predetermined pattern are not striped. B, a stripe having a pattern different from the predetermined pattern expressed by the second entanglement is a stripe A.

  In an example of the method for producing a nonwoven fabric of the present invention, hydroentanglement is performed by high-pressure water streams ejected from a plurality of orifices formed in a nozzle. In this case, if the hole diameter of the orifice is 0.05 to 0.5 mm, and the distance between the orifice and the fiber assembly is 7 mm to 30 mm, and more preferably 10 to 25 mm, the uniformity of the texture of the nonwoven fabric is improved. It is preferable because a stripe having a good and clear pattern can be formed.

  Further, when a plurality of orifices are used, as shown in FIG. 7, a plurality of orifice groups a9 and a nozzle divided into a plurality of orifice groups b10 in the orifice group a are included in one stripe group. The number of stripes A to be produced is larger than the number of stripes B, the stripe A has a regular pattern, and the non-woven fabric in which the pattern of stripes B and C is plain can be obtained. The length in the longitudinal direction of each group (for example, the length in the same direction as the CD direction) is suitably 6 to 75 mm for the orifice group a, preferably 9 to 60 mm, and more preferably 12 to 45 mm. A more preferred upper limit is 25 mm. The distance between adjacent orifice groups a is suitably 2 to 90 mm, preferably 4 to 75 mm, more preferably 6 to 50 mm, still more preferably 10 to 30 mm, and still more preferably the upper limit is 20 mm. It is. Moreover, 2-25 mm is suitable for the length of the longitudinal direction of the orifice group b, it is preferable in it being 3-20 mm, it is more preferable in it being 4-15 mm, and a more preferable upper limit is 10 mm. Moreover, 2-25 mm is suitable for the distance between the adjacent orifice groups b, it is preferable in it being 3-20 mm, it is more preferable in it being 4-15 mm, and a more preferable upper limit is 10 mm. The individual orifices constituting the orifice group b may be arranged in a straight line in the longitudinal direction, or may be arranged in a staggered pattern.

  Hereinafter, an example of the present invention will be described in more detail.

  The schematic diagram of an example of the nonwoven fabric of this invention is shown in FIG.1, FIG.2 and FIG.3. The non-woven fabric 1 shown in FIG. 1 forms stripe groups 4 by alternately arranging stripes A 2 having a regular pattern and plain stripes B 3, and between the individual stripe groups 4. Is a plain stripe C5 having a width different from the width of the stripes A2 and B3, in this case, a larger width. The nonwoven fabric 11 shown in FIG. 2 forms a stripe group 14 by alternately arranging a stripe A12 having a regular pattern and a plain stripe B13 different from the predetermined pattern. Between the individual stripe groups, a stripe C15 having a width different from that of the above-mentioned predetermined pattern and different from the widths of the stripe A12 and the stripe B13, in this case, a larger width is disposed. . The nonwoven fabric 21 shown in FIG. 3 forms a stripe group 24 by alternately arranging five stripes A22 having a regular pattern and four plain stripes B23. Between the stripe groups 24, a plain stripe C25 having a width different from the widths of the stripes A22 and B23, in this case, a larger width is arranged.

  The nonwoven fabric 1 shown in FIG. 1 can be produced, for example, as follows. First, the constituent fibers of the fiber assembly are first entangled. Next, after arranging the fiber assembly on a support having a predetermined pattern (pattern), a high-pressure water stream is jetted onto a part of the fiber assembly, and the constituent fibers of the part are second entangled, The constituent fibers are rearranged to form a stripe pattern. The portion of the fiber assembly that has received the high-pressure water stream becomes a stripe A2 having a regular pattern. At this time, in the portions other than the stripe A2, the second entanglement is performed by arranging the orifices formed in the nozzle so that the stripe B3 and the stripe C5 are formed and the stripe group 4 is formed.

  The nonwoven fabric 11 shown in FIG. 2 can be produced as follows, for example. First, the constituent fibers of the fiber assembly are first entangled. Next, after the fiber assembly is arranged on a support having a predetermined pattern (pattern), a high-pressure water stream is jetted onto a part of the fiber assembly, and the constituent fibers of the part are fifth entangled. The constituent fibers are rearranged to form a stripe pattern. Next, a part of the constituent fibers existing between the stripes having the adjacent predetermined pattern is second entangled on a support having a pattern different from the support used in the step, and the predetermined A stripe A12 having a pattern different from the pattern is developed. And the part which exists between the stripes which have the said adjacent predetermined pattern which was not entangled in the 2nd entanglement becomes stripe B13, and the stripe formed by the 5th entanglement becomes stripe C15.

  The non-woven fabric 21 shown in FIG. 3 is, for example, in the case where the non-woven fabric of FIG. 1 is manufactured, so that the number of stripes A included in one stripe group is 5 in the second entanglement. It can be produced by performing two entanglements.

  Moreover, the schematic diagram of another example of the nonwoven fabric of invention is shown in FIG. 8, FIG. The nonwoven fabric 41 shown in FIG. 8 forms a stripe group 44 by alternately arranging one stripe B43 having a regular pattern and two plain stripes A42. Between the stripe groups 44, stripes C45 having the same regular pattern as the stripes B having a width different from the widths of the stripes A42 and B43, in this case, a larger width are arranged. The nonwoven fabric 51 shown in FIG. 9 has two stripes A52 having a regular pattern and two stripes B53 having a regular pattern different from the two stripes A are alternately arranged. The stripe group 54 is formed, and between the individual stripe groups 54, a plain stripe C55 having a width different from the width of the stripe A52 and the stripe B53, in this case, a larger width is arranged.

  The nonwoven fabric 41 shown in FIG. 8 can be produced, for example, as follows. First, the constituent fibers of the fiber assembly are first entangled. Next, after arranging the fiber assembly on a support having a predetermined pattern (pattern), a high-pressure water stream is jetted onto a part of the fiber assembly, and the constituent fibers of the part are second entangled, The constituent fibers are rearranged to form a stripe pattern. The portions of the fiber aggregate that have been subjected to the high-pressure water flow become stripes B43 and C45 having regular patterns. At this time, in the portions other than the stripe B43 and the stripe C45, the second entanglement is performed by arranging the orifices formed in the nozzle so that the stripe A42 is formed and the stripe group 44 is formed.

  Moreover, the nonwoven fabric 41 shown by FIG. 8 can be produced as follows as another method. First, the constituent fibers of the fiber assembly are first entangled. Next, after the fiber assembly is arranged on a support having a predetermined pattern (pattern), a high-pressure water stream is jetted onto the entire surface of the fiber assembly to make the constituent fibers of the entire surface third entangled, and the constituent fibers Rearrange. Next, on the same support as that used in the first entanglement, that is, a support capable of forming a plain pattern, a high-pressure water stream is jetted to a part of the fiber assembly, and the constituent fibers of the part A sixth pattern is entangled with each other and the constituent fibers are rearranged to form a stripe pattern. The portion of the fiber assembly that has received the high-pressure water flow during the sixth entanglement is a stripe A42 made of a plain pattern. At this time, in the portions other than the stripe A42, the orifices formed in the nozzles are arranged so that the stripes B43 and C45 having a regular pattern are formed and the stripe group 44 is formed. 6 Confounding.

  The nonwoven fabric 51 shown in FIG. 9 can be produced, for example, as follows. First, a nonwoven fabric similar to the nonwoven fabric shown in FIG. 1 is produced. Thereafter, a portion of the stripe B3 made of the plain pattern and a portion of the stripe C5 made of the same plain pattern and adjacent to the stripe A2 located at one end of the stripe group 4 adjacent to the stripe C5 The hydroentanglement (seventh entanglement) is performed on a support having a regular pattern different from the predetermined pattern of the support used in the case of two entanglements. At this time, the portion of the fiber assembly that received the high-pressure water flow at the time of the seventh entanglement becomes the stripe B53, and the original stripe A2 becomes the stripe A52 as it is. A group 54 is formed. Further, the portion of the stripe C5 that did not receive the high-pressure water flow during the seventh entanglement becomes the stripe C55.

  Although there is no restriction | limiting in particular about the form of a support body, What is used widely, such as the pattern net formed by weaving a monofilament or a metal wire, the roll provided with the protrusion, can be used arbitrarily. Specific examples include pattern nets such as plain weave, cedar weave, twill weave, and spiral weave, aperture plates, aperture rolls, and the like.

  As shown in FIG. 1 to FIG. 3, an example of the nonwoven fabric of the present invention has a stripe group in which the longitudinal direction is the same as the MD direction, and stripes A and stripes B are alternately arranged. The groups are separated from each other, and a stripe C is provided between a pair of adjacent stripe groups. The stripe group includes a plurality of stripe groups, and the stripe A, stripe B, and stripe C are different from the pattern of adjacent stripes. Since it has a pattern and the stripe A and / or the stripe B has a regular pattern, it exhibits a stripe pattern, so that the design is excellent. In particular, the nonwoven fabrics of FIGS. 1 to 3 are more excellent in design because the width of the stripes C is larger than the widths of the stripes A and B. Further, by changing the regular pattern or changing the width and number of stripe groups, wiping performance and usability suitable for the purpose can be given. Moreover, when the usage pattern is in a wet state, the weight of wiping can be adjusted by changing the width and number of each stripe.

  As described above, the structural unit of the regular pattern includes at least one selected from the group consisting of irregularities and apertures. Although there is no restriction | limiting in particular about the aspect of a pattern, For example, a dot pattern (for example, refer FIG. 4, FIG. 5) obtained by forming at least 1 sort (s) chosen from the group which consists of an unevenness | corrugation and an opening | open_hole, for example, Aya Sugi All patterns such as a pattern (see, for example, FIG. 6), a checkered pattern, a lattice pattern, a staggered pattern, a spiral net pattern, and a zigzag pattern are included.

  Here, for example, as shown in FIG. 6, the unevenness has no portion where no fiber is present when the convex portion is viewed with the naked eye, and the thickness of the convex portion 7 is T1 and the thickness T2 of the concave portion 8 is, T1 / T2 is 1.3 or more. However, when there is an opening in the recess (the area of the opening here may be 0.5 mm 2 or more, or may be less than 0.5 mm 2), the thickness of the portion where the fiber exists is set. Let T2. In addition, for a nonwoven fabric with large thickness unevenness (specifically, a nonwoven fabric having T1av10 / T2av10 exceeding 2; however, T1av10 and T2av10 are the average values of 10 points of T1 and T2), the unevenness is 1 for T1av5 / T2av5. .3 or more (T1av5 and T2av5 are average values of five points T1 and T2).

  T1 and T2 are measured using an electron microscope from a cross section obtained by cutting a nonwoven fabric in the thickness direction with a razor. Non-woven fabric fluff is not considered when determining the thickness.

  For example, as shown in FIG. 4 and FIG. 5, the opening 6 is a through-hole having a part where no fiber is present from the front surface to the back surface of the nonwoven fabric, and can be seen with the naked eye. If the area is 0.5 mm 2 or more, it is regarded as an opening.

  The zigzag pattern is a pattern formed by connecting the convex and concave portions of the above-mentioned irregularities to form a ridge, and further, the ridge is periodically zigzag changed in angle.

  For example, when the pattern is a dot pattern in which a large number of apertures are arranged in a staggered pattern (see FIG. 5), dust that has passed without being captured by the apertures in the front row can be captured in the rear row in the wiping direction. Therefore, a nonwoven fabric excellent in wiping property can be obtained. Such a dot pattern can be easily obtained by using, for example, a plain weave net in which the knuckle portions are arranged in a zigzag pattern or a plate-like body having a plurality of projections arranged in a zigzag pattern as the support.

  For example, when the pattern is a herringbone pattern or a spiral net pattern, a relatively high density part and a low density part of the fiber are repeated with a small period, so that a nonwoven fabric excellent in water absorption utilizing capillary action is obtained. I can do it. Moreover, since the unevenness | corrugations run in the diagonal direction, at the time of wiping off, dust can be taken in to the center part of the wiping surface more, and dust can be caught by the whole wiping surface, and it is preferable. The cedar pattern can be easily obtained, for example, by using a twill net as a support. The spiral net pattern can be obtained by using a spiral net as a support, for example.

  For example, as shown in FIG. 6, in the herb pattern, a line a that is inclined at a predetermined angle with respect to the MD direction and a line b that is symmetrical to the line a are alternately repeated along the CD direction. It is. In this case, it is preferable that the predetermined angle [theta] is 5 to 60 [deg.], Since dust collecting properties and slipping properties when a non-woven fabric is used as a wiping cloth are improved.

  The spiral net pattern is, for example, a pattern obtained when a spiral net is used as a support, and the portions arranged on the spiral line and the lot line in the fiber assembly become concave portions and are adjacent to each other in the fiber assembly. It is a concavo-convex pattern approximated to a herringbone pattern formed by forming a portion arranged in a space between spiral lines as a convex portion. For example, referring to FIG. 6, with respect to a line b that is symmetric with respect to the line a, when the line a is a convex part 7, the line b immediately adjacent to the line a is a concave part 8. is there.

  For example, when the pattern is a zigzag pattern, it is preferable to increase the height of the convex part of the zigzag pattern so that a relatively large amount of moisture or chemicals can be stored in the convex part. The zigzag pattern can be easily obtained by using, for example, a plain weave net with two warps as a support, or a punching plate with a zigzag pattern.

  Although there is no restriction | limiting in particular about the shape of an opening, For example, circular shape, an ellipse shape, a rectangular shape, a rhombus shape etc. are mentioned. For example, when the regular pattern is formed from a plurality of openings, the sizes of the openings may be the same or different. It is preferable that the sizes of the apertures are different because they can catch dirt of various sizes.

  The shape of the constituent fiber of the fiber assembly used for the production of the nonwoven fabric of the present invention is not particularly limited, and examples thereof include a single fiber, a sheath-core type composite fiber, a split type composite fiber, or a fiber having an irregular cross section.

  The material of the constituent fibers of the fiber assembly includes one or more materials. When the constituent fiber is composed of two or more materials (when the fiber aggregate is composed of one kind of constituent fiber and the constituent fiber itself is composed of two or more materials, and the fiber aggregate is composed of two or more constituent fibers different in material) When at least one of the two or more materials contains a material having a relatively lower melting point than the other materials, the regular pattern can be maintained well. However, it is preferable because the constituent fibers can be fused.

  The fineness of the constituent fibers is preferably 1 × 10 −4 dtex or more and 6.6 dtex or less, more preferably 0.1 dtex or more and 4.4 dtex or less, because a clear pattern can be formed without adversely affecting the fibers. More preferably, it is not less than 0.25 dtex and not more than 3.3 dtex.

  Examples of the constituent fiber material include natural fibers such as cotton, silk, and pulp, regenerated fibers such as rayon (solvent spinning type and viscose rayon), acetate, acrylic resin, polyamide such as nylon 6 and nylon 66, Examples thereof include polyesters such as polyethylene terephthalate and polybutylene terephthalate, and polyolefins such as polyethylene and polypropylene.

  When using the nonwoven fabric of the present invention as a wiping material, depending on the use of the wiping material, the type and fineness of the fiber to be used, the basis weight of the nonwoven fabric, etc. may be set as appropriate, for example, the nonwoven fabric of the present invention is fine dust, When used as a dry wiping material such as a flooring wiper or precision wiper for wiping off dust etc., the nonwoven fabric consists of two components that are incompatible, and at least one component in the fiber cross section is two or more. It is preferable to contain 50% by mass or more of split-type composite fibers that are divided into two, more preferably 70% by mass or more. Examples of the combination of the two components include nylon / polyester, polyester / polypropylene, ethylene-vinyl alcohol copolymer / polypropylene, and polyester / polyethylene. The fineness of these fibers is preferably 3.5 dtex or less for the reason that wiping property is good and the liquid entanglement property is good and the hydroentanglement property is good and the pattern tends to appear.

  Examples of the fibers contained in the nonwoven fabric in addition to the split type composite fibers include synthetic fibers composed of a single component. Among them, polyester fibers and rayon fibers having a fineness of 6.6 dtex or less are preferable.

  In the present invention, the fiber assembly may be any fiber as long as the constituent fibers can be rearranged by hydroentanglement, and for example, one of fiber webs, entangled webs, bonded webs, woven and knitted fabrics, or a laminate thereof can be used. .

  Examples of the fibrous web include a card web, an air laid web, a wet paper web, a long fiber web (for example, a spunbond web), a meltblown web, and the like, and are not particularly limited as long as the web can be rearranged by hydroentanglement.

  The entangled web is a fiber aggregate, in particular, a state in which the fiber web is first entangled. The first entanglement of the fiber web is, for example, a needle punching method, a hydroentanglement method, a water vapor flow (from the viewpoint of productivity) Steam jet) may be performed by any method such as entanglement method, but the second entanglement performed to form a stripe pattern by rearranging part of the constituent fibers by hydroentanglement is performed by hydroentanglement method. Therefore, it is preferable to carry out the hydroentanglement method.

  As the bonded web, a fiber aggregate, in particular, a part of the constituent fibers of the fiber web is bonded, and examples thereof include an embossing method, an air-through method, and a chemical bond method.

  When the use of the nonwoven fabric of the present invention is a wet wiper such as wet wiper, wet tissue, or disposable towel, etc., the nonwoven fabric may be natural fibers such as cotton, silk, pulp, rayon (solvent spinning type or screw). It is preferable to contain regenerated fibers such as coarse rayon), semi-synthetic fibers such as acetate, and hydrophilic fibers such as acrylic fibers. In particular, when the hydrophilic fiber contains at least one cellulose fiber selected from the group consisting of rayon, pulp, and cotton, for example, the synthetic fiber is equivalent to a non-woven fabric having no or no water absorption, such as polyester or polypropylene. The non-woven fabric has a higher water absorbability than the case of only consisting of, and is preferable. The constituent fibers preferably contain 30% by mass or more of hydrophilic fibers, and more preferably contain 50% by mass or more. The inclusion of hydrophilic fibers is also preferable in that a clear pattern is easily formed. The upper limit of the content of the hydrophilic fiber is preferably 90% by mass or less because the sufficient breaking strength is ensured.

  The basis weight of the first entangled fiber aggregate is preferably 20 to 300 g / m 2 and more preferably 20 to 100 g / m 2 because a clear pattern can be formed.

  When the first entanglement is performed by hydroentanglement, the form of the support used at that time is not particularly limited, and a conventionally known support may be used. For example, the warp wire diameter is 0. A plain weave net having a size of 05 mm to 1.5 mm, a weft wire diameter of 0.05 mm to 1.5 mm, and a mesh number of 15 to 110 mesh is suitable. In order to obtain a plain fiber aggregate by the first entanglement, for example, the warp wire diameter is 0.05 mm to 0.2 mm, the weft wire diameter is 0.05 mm to 0.2 mm, and the number of meshes is 70 to 110 mesh. It is preferable to use a plain weave net.

  The pressure of the water stream used when rearranging the constituent fibers of the fiber assembly (the set value of the water supply, hereinafter the same for any water stream pressure) is usually preferably 1 to 14 MPa, 10 MPa is more preferable.

  The pressure of the water flow at the time of performing the first entanglement is preferably 1 to 12 MPa from the viewpoint of improving the entanglement property and uniformity of the entanglement when, for example, a fiber aggregate of 20 to 300 g / m 2 is processed. ˜9 MPa is more preferable.

  When the third entanglement is performed in the manufacturing process of an example of the nonwoven fabric of the present invention, the pressure of the water flow when performing the third entanglement is set according to the basis weight of the fiber aggregate to be processed, the pattern to be formed, and the like. Although it is good, for example, when processing a fiber aggregate of 20 to 300 g / m 2, 1 to 14 MPa is preferable, and 2 to 10 MPa is more preferable.

  As above-mentioned, in an example of the manufacturing method of the nonwoven fabric of this invention, a high voltage | pressure water flow is injected with respect to a part of 1st entangled and / or 3rd entangled fiber assembly. The jet of the high-pressure water stream is performed under the condition that the constituent fibers of the fiber aggregate are rearranged to form holes or irregularities in the nonwoven fabric.

  When the second entanglement is performed in the manufacturing process of an example of the nonwoven fabric of the present invention, the pressure of the water flow when performing the second entanglement is set according to the basis weight of the fiber aggregate to be processed, the pattern to be formed, etc. For example, when a fiber aggregate of 20 to 300 g / m 2 is treated, 1 to 14 MPa is preferable and 2 to 10 MPa is more preferable because a clear pattern can be formed without damaging the support. .

  When the fourth entanglement is performed in the manufacturing process of an example of the nonwoven fabric of the present invention, the pressure of the water flow when performing the fourth entanglement is set according to the basis weight of the fiber aggregate to be processed, the pattern to be formed, and the like. For example, when a fiber aggregate of 20 to 300 g / m 2 is processed, 1 to 12 MPa is preferable, and 2 to 9 MPa is more preferable.

  When the fifth entanglement is performed in the manufacturing process of an example of the nonwoven fabric of the present invention, the pressure of the water flow when performing the fifth entanglement is set according to the basis weight of the fiber aggregate to be processed, the pattern to be formed, and the like. Although it is good, for example, when processing a fiber aggregate of 20 to 300 g / m 2, 1 to 14 MPa is preferable, and 2 to 10 MPa is more preferable.

  For supplying the high-pressure water flow, for example, one or more nozzles that are arranged so that the longitudinal direction thereof is orthogonal to the traveling direction of the fiber assembly and have a plurality of orifices (openings) can be used. The diameter of the orifice is preferably 0.05 mm or more from the reason that a clear pattern can be formed, and 0.5 mm or less from the reason that the texture can be adjusted without disturbing the fiber assembly. And preferred. When performing the 1st entanglement or the 3rd entanglement, 0.3 mm-1.5 mm are suitable for the space | interval of an adjacent orifice. The individual orifices may be arranged in a straight line in the longitudinal direction, or may be arranged in a staggered pattern.

  The orifice formation location in the nozzle, the interval between adjacent orifices, and the like are appropriately set according to the pattern formed on the fiber assembly, but the number of stripes A included in one stripe group is the number of stripes B. When a non-woven fabric is obtained in which the stripe A has a regular pattern and the stripe B and the pattern of the stripe C are plain, the plurality of orifices are divided into a plurality of orifice groups as shown in FIG. Is done. The orifice group is divided into a plurality of orifice groups a9, and the width of each orifice group a is preferably 6 to 75 mm. The distance between adjacent orifice groups a is preferably 2 to 90 mm, more preferably 4 to 75 mm. Each orifice group a is further divided into a plurality of orifice groups b10. The distance between adjacent orifice groups b is preferably 2 to 25 mm, and the width of the orifice group b itself is preferably 2 to 25 mm. The distance between adjacent orifices in the orifice group b is preferably 0.3 to 1.5 mm because the pattern can be clearly displayed. The number of orifice groups b present in each orifice group a is preferably 2 to 7. The individual orifices constituting the orifice group b may be arranged in a straight line in the longitudinal direction, or may be arranged in a staggered pattern.

  In addition, the number of stripes A included in one stripe group is larger than the number of stripes B, the stripes B and C have the same regular pattern, and the stripe A pattern is the stripe B and stripe B. When obtaining a nonwoven fabric having a different pattern (for example, a plain pattern), the plurality of orifices are divided into a plurality of orifice groups as shown in FIG. The orifice group is divided into a plurality of orifice groups c31 and an orifice group d32. The width of each orifice group d is preferably 2 to 90 mm, more preferably 4 to 75 mm, and even more preferably 6 to 50 mm. It is further more preferable that it is -30 mm, and the upper limit further more preferable is 20 mm. Between the pair of orifice groups d, one or more orifice groups c exist, and the width of each orifice group c is preferably 2 to 25 mm, more preferably 3 to 20 mm, and 4 to 15 mm. More preferably, the upper limit is 10 mm. The distance x between the orifice group d and the orifice group c or the distance x between the adjacent orifice groups c when there are a plurality of orifice groups c is preferably 2 to 25 mm, more preferably 3 to 20 mm. It is more preferable that it is 4-15 mm, and a still more preferable upper limit is 10 mm. The interval between the orifice groups d is preferably 6 to 75 mm, more preferably 9 to 60 mm, still more preferably 12 to 45 mm, and still more preferably the upper limit is 25 mm.

  Further, the distance between the orifice and the fiber aggregate is preferably 7 to 30 mm, more preferably 10 to 25 mm because a clear pattern can be formed.

  Hereinafter, the contents of the present invention will be described with reference to examples. The thickness, breaking strength, breaking elongation, and 10% and 20% elongation stress of the obtained nonwoven fabric were measured as follows.

[Thickness]
Using a nonwoven fabric thickness measuring machine (trade name: THICKNESS GAUGE model CR-60A, manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd.), the measurement was performed in accordance with JIS L 1096 with a load of 3 g per 1 cm 2 of the sample.

[Strength at break, elongation at break]
In accordance with JIS L 1096, a sample piece having a width of 5 cm and a length of 15 cm is gripped so that the chuck spacing is 10 cm, and a constant speed extension type tensile tester (trade name: Tensilon UCT-1T manufactured by Orientec Co., Ltd.) is used. The sample piece was stretched at a tensile speed of 30 cm / min, and the load value and elongation rate at break were measured as the breaking strength and breaking elongation, respectively.

[10%, 20% elongation stress]
10% elongation at the time of 10% elongation at the time of 10% elongation at the time of breaking strength measurement, that is, the load value when it is elongated by 1 cm from the measurement start point (the load value when the distance between chucks (10 cm) is 11 cm) Measured as stress. Similarly, for the stress at 20% elongation, the load value when stretched 2 cm from the measurement start point was measured as the stress at 20% elongation.

[Examples 1 to 14]
Solvent-spun rayon fiber (fineness 1.5 dtex, fiber length 40 mm, trade name: Lyocell Lenzing) 80% by mass, the first component is polyethylene terephthalate (melting point 253 ° C.), and the second component is high-density polyethylene (melting point) 132 ° C.) 10% by mass of a split type composite fiber (fineness 2.2 dtex, fiber length 51 mm, product name: DFS (SH), manufactured by Daiwabo Polytech Co., Ltd.) Core-sheath type composite fiber (fineness: 1.7 dtex, fiber length: 51 mm, product name: NBF (H), manufactured by Daiwabo Polytech Co., Ltd.) 10 mass with polyethylene (melting point: 132 ° C.) and core component as polypropylene (melting point: 160 ° C.) %, And the resulting product is carded using a roller-type parallel card, and the basis weight is about 50 g / m 2. The card web was produced.

  Next, while placing the card web on the first entanglement net and proceeding at a speed of 4 m / min, orifices with a hole diameter of 0.13 mm are provided at 0.6 mm intervals on the surface of the card web. After injecting a columnar water flow having a water pressure of 2.5 MPa using the water supply device, a columnar water flow having a water pressure of 2.5 MPa was injected to the back surface using the same water supply device. The distance between the surface of the card web and the orifice was 15 mm. The first entangled fiber web (entangled web) was obtained as described above. A plain weave PET net having a warp wire diameter of 0.132 mm, a weft wire diameter of 0.132 mm, and a mesh count of 90 mesh was used for the first interlacing net.

  Next, using the following nets A to C as a support, second entanglement is performed from the surface side of the fiber web (entangled web) to form a plurality of stripes A having a regular pattern and parallel to the MD direction. did. Next, drying and heat treatment were performed in a dryer having an atmospheric temperature of 100 ° C., followed by drying and heat treatment at an atmospheric temperature of 135 ° C. for 10 seconds to obtain the nonwoven fabrics of Examples 1 to 14 shown in Table 1. Table 2 shows the physical properties of the obtained nonwoven fabric.

  When performing the second entanglement, the water supply unit used when performing the first entanglement was used, but some of the plurality of orifices were closed so that there was no water flow. The traveling speed was 4 m / min, the water pressure during the second entanglement was 3.5 MPa, and the distance between the surface of the fiber web (entangled web) and the orifice was 15 mm. The arrangement of the plurality of orifices in the water feeder is such that the width and number of stripes A having a regular pattern formed at the time of the second entanglement and the pattern different from the regular pattern of the stripe A (plain color) ) And the number of the stripes B and the width of the stripes C and the width of the stripes C are determined as shown in Table 1.

[Net A] A plain weave net with a warp wire diameter of 0.132 mm, a weft wire diameter of 0.132 mm, and a mesh count of 25 mesh. [Net B] A warp wire diameter of 0.4 mm and a weft wire diameter of 0. 3/1 cypress weave net of 8mm, weaving density 68/18 / inch [Net C] Spiral wire diameter 0.92mm, lot wire diameter 0.85mm, lot pitch 5mm, spiral wire 1 Spiral net made of 11 polyester monofilaments per inch

[Comparative Example 1]
In the same manner as in Examples 1 to 14, the card web was first entangled to obtain a fiber web (entangled web). Using the same support as the first entanglement on the back surface of the obtained fiber web (entangled web), using a water feeder in which orifices with a hole diameter of 0.13 mm are provided at intervals of 0.6 mm in the nozzle A columnar water flow having a water pressure of 2.5 MPa was sprayed over the entire surface without blocking any orifice. The distance between the surface of the fiber web (entangled web) and the orifice was 15 mm. Subsequently, it dried and heat-processed in the dryer similarly to Example 1, and the nonwoven fabric of the comparative example 1 was obtained. Table 2 shows the physical properties of the obtained nonwoven fabric.

[Comparative Examples 2 to 4]
In the same manner as in Examples 1 to 14, the card web was first entangled to obtain a fiber web (entangled web). The obtained fiber web (entangled web) is arranged on the nets A to C, and orifices having a diameter of 0.13 mm are provided at 0.6 mm intervals on the nozzle with respect to the entire surface of the fiber web (entangled web). A columnar water flow with a water pressure of 3.5 MPa was jetted without blocking any orifice. The distance between the surface of the fiber web (entangled web) and the orifice was 15 mm. Subsequently, similarly to Example 1, it dried and heat-processed in the dryer, and obtained the nonwoven fabric of Comparative Examples 2-4. Table 2 shows the physical properties of the obtained nonwoven fabric.

[Comparative Examples 5 to 7]
When performing the second entanglement, the nozzle is an orifice group in which two orifices having a hole diameter of 0.15 mm are provided at intervals of 1 mm, and an orifice having an interval between the orifice groups of 10 mm is provided. The nonwoven fabric which used net | network AC as a support body was manufactured like Example 1 except having used the container. The actually obtained nonwoven fabric is not a discriminating stripe A and stripe B, but a nonwoven fabric in which stripes A having a width of 2 mm and stripes C having a width of 10 mm are alternately arranged one by one. Obtained. Table 2 shows the physical properties of the obtained nonwoven fabric.

[Comparative Example 8]
When performing the second entanglement, the nozzle is an orifice group in which two orifices having a hole diameter of 0.15 mm are provided at intervals of 1 mm, and an orifice having an interval between the orifice groups of 10 mm is provided. A nonwoven fabric was obtained in the same manner as in Example 1 except that the net used in the first entanglement was used as a net. The obtained non-woven fabric had a pattern in which nozzle streaks were simply formed by hydroentanglement.

[Examples 15 to 41]
In the same manner as in Examples 1 to 14, the card web was first entangled to obtain a fiber web (entangled web). The obtained fiber web (entangled web) is arranged on the nets A to C, the second entanglement is performed from the surface side of the fiber web (entangled web), has a regular pattern, and is parallel to the MD direction. A plurality of stripes B and stripes C were formed. Next, in the same manner as in Example 1, drying and heat treatment were performed in a dryer to obtain nonwoven fabrics of Examples 15 to 41. Table 4 shows the physical properties of the obtained nonwoven fabric.

  When performing the second entanglement, the water supply unit used when performing the first entanglement was used, but some of the plurality of orifices were closed so that there was no water flow. The traveling speed was 4 m / min, the water pressure during the second entanglement was 3.5 MPa, and the distance between the surface of the fiber web (entangled web) and the orifice was 15 mm. The arrangement of the plurality of orifices in the water feeder is such that the width and number of stripes B having a regular pattern formed at the time of the second entanglement, and a pattern different from the regular pattern of the stripe B (plain color) ) And the number of the stripes A and the width of the stripes C were determined so as to have the values shown in Table 3.

  When the total widths of the stripes A having a regular pattern in a certain range are the same, it is possible to increase the number of stripes A included in the stripe group and / or stripe A and stripe included in the stripe group. The smaller the width of B, the greater the strength. For example, when Examples 1 to 6 are compared, in the nonwoven fabrics of Example 1 and Example 6, Example 1 in which the widths of stripe A and stripe B are smaller is particularly 10% and 20% in the MD direction. It showed a big value. This is because the total number of stripes A in a certain range increases, so that the columnar water flow at the time of hydroentanglement interferes with the adjacent columnar water flow (for example, by deviating from the vertical direction) Since the probability of energy loss decreases, it seems that the strength of the nonwoven fabric as a whole increases in the pattern in which the strength is greater than that of the plain. In this case, as described above, the energy loss is reduced, so that the manufacturing cost is reduced.

  Moreover, about the nonwoven fabric of Examples 15-41 in which the stripe B and the stripe C have a regular pattern, and the stripe A has a plain pattern, it is a nonwoven fabric of Examples 1-14, Comprising: Each width | variety of a stripe Compared with the nonwoven fabric in which the regular pattern and the plain pattern are interchanged, the values of the breaking strength in the MD direction and the CD direction were higher. The nonwoven fabric of Example 16 and the corresponding nonwoven fabric of Example 1 are examples.

  Next, about the nonwoven fabric of Examples 1-41 and Comparative Examples 1-7, the wiping off characteristic was evaluated by the method shown below.

[Wiping properties]
The non-woven fabrics of Examples 1-14 and Comparative Examples 1-7 (7 cm in length, 7 cm in length) in which 0.50 g of JIS dust 7 types were uniformly dispersed in a 7 × 20 cm area on the glass surface and the mass was measured in advance. The dust was wiped off at a width of 12 cm). Wiping was performed in a state where a nonwoven fabric was attached to the sponge so that the area contributing to wiping was 35 cm 2 and a weight of 500 g was applied. The mass of the nonwoven fabric after two reciprocations in the direction perpendicular to the longitudinal direction of the stripe was measured, the dust adsorption rate was calculated according to the following (formula 1), and the wiping characteristics according to the following criteria were evaluated. The results are shown in Table 5 for Examples 1-14 and Comparative Examples 1-7, and in Table 6 for Examples 15-41.

Dust adsorption rate (%) = (mass after wiping-mass before wiping) /0.5 x 100 (Formula 1)
[Wiping property evaluation criteria]
×: Dust adsorption rate is less than 10% ○: Dust adsorption rate is 10% to 14%
A: Dust adsorption rate is 15% or more

  As can be seen from the results described in Tables 5 and 6, the dust adsorption rate of the nonwoven fabrics in which the stripes of Examples 1 to 14 and Examples 15 to 41 were formed was the same as that of the nonwoven fabric with the entire surface of Comparative Example 1 being plain. A numerical value greater than the rate value is shown. In particular, when the number of stripes A having a regular pattern included in one stripe group is large, a higher dust adsorption rate is shown. Moreover, compared with the nonwoven fabric in which the conventional stripe patterns of Comparative Examples 5 to 7 are arranged at equal intervals, Examples 1 to 14 and Examples 15 to 41 of the present application having stripes C having different widths from the stripes A and B. The non-woven fabric shows a higher dust adsorption rate. Moreover, when each net | network A, B, and C was compared, the net | network B showed the comparatively better wiping off property. This is presumably because the non-woven fabric of the herringbone pattern by the net B has a structure in which dust can be easily fed deeper into the wiping surface. In addition, when compared between non-woven fabrics using the same net, when the total width of the stripes A having a regular pattern in a certain range is the same, it is better to increase the number of stripes A included in the stripe group, And / or the one where the width | variety of the stripe A and the stripe B contained in a stripe group was smaller showed the better wiping off property. This is because, under the condition that the stripe A has a regular pattern with the same width, the stripe A and the stripe B have a larger number of stripes A and / or a smaller stripe A width. This seems to be because the unevenness increases. The same tendency is observed in the non-woven fabric in which the stripe B and the stripe C have a regular pattern and the stripe A has a plain pattern, and the stripe A, the stripe B, and the stripe C have a narrower width ( In Examples 15 to 17, 22 to 26, 31 to 35, 40, and 41), the value of the dust adsorption rate was higher.

  The non-woven fabric of the present invention is also useful as a surface material for absorbent articles, medical materials such as gauze, table cloths, etc., especially for wiping materials such as precision wipers, cleaning wipers, interpersonal / objective wet wipers, and wipes. Is preferred. When the constituent fibers contain 30% by mass of hydrophilic fibers, the nonwoven fabric of the present invention is suitable for wet wipes such as interpersonal / objective wet wipers, wet tissues, or disposable towels. When the nonwoven fabric of the present invention contains 50% by mass or more of a split type composite fiber made of an incompatible two-component resin and having at least one component divided into two or more in the fiber cross section, the nonwoven fabric of the present invention is a wiper for OA equipment. Suitable for high-performance wipes such as precision wipers.

1, 11, 21, 41, 51 Nonwoven fabric 2, 12, 22, 42, 52 Stripe A
3, 13, 23, 43, 53 Stripe B
4, 14, 24, 44, 54 Stripe group 5, 15, 25, 45, 55 Stripe C
6 Opening 7 Convex 8 Concave 9 Orifice Group a
10 Orifice group b
30 Orifice 31 Orifice group c
32 Orifice group d

Claims (7)

A part of the constituent fibers of the fiber assembly is formed by rearrangement by hydroentanglement, and has a regular pattern and a plurality of stripes spaced apart from each other, thereby presenting a stripe pattern,
A stripe group in which stripes A and B are alternately arranged;
The stripe group has a plurality, the stripe groups are spaced apart from each other, and have a stripe C between a pair of adjacent stripe groups,
Stripe A, stripe B, and stripe C have a pattern different from the pattern of adjacent stripes,
A nonwoven fabric in which stripes A and / or stripes B have a regular pattern.   The nonwoven fabric according to claim 1, wherein the longitudinal direction of the stripe is parallel to the MD direction (longitudinal direction) of the nonwoven fabric.   The nonwoven fabric according to claim 1 or 2, wherein the width of the stripe A is 2 to 25 mm, and the width of the stripe B is 2 to 25 mm.   The width of the stripe C is larger than the width of the stripe A and the stripe B, The nonwoven fabric according to any one of claims 1 to 3.   A part of the constituent fibers of the fiber assembly is hydroentangled on a predetermined support having a regular pattern, thereby expressing a plurality of stripes in which a part of the constituent fibers are rearranged, and the stripe A Stripes C and stripes B are alternately arranged, and stripes C are arranged between the plurality of stripe groups spaced apart from each other, and stripes A, stripes B, and stripes C have a pattern different from the adjacent stripe pattern. And the manufacturing method of the nonwoven fabric including the process of forming the stripe pattern in which the stripe A and / or the stripe B have a regular pattern.   The method for producing a nonwoven fabric according to claim 5, wherein the orifices of the nozzles used for the hydroentanglement include a plurality of orifice groups a and an orifice group b which is further divided into a plurality of orifice groups a.   A wiping material comprising the nonwoven fabric according to any one of claims 1 to 4.