JP2011117095A - Nonwoven fabric and wiping material using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nonwoven fabric having high wiping performance and a wiping material. <P>SOLUTION: The nonwoven fabric 10 is a nonwoven fabric containing a fiber assembly. The nonwoven fabric is obtained by interlacing constituent fibers by needle punching to form first interlacement parts 1 in which parts remain in this state, further interlacing constituent fibers of prescribed places of the nonwoven fabric to form second interlacement parts 2. The first interlacement parts 1 and the second interlacement parts 2 are mutually separated and exist in a plurality of lines. The first interlacement parts 1 have a relatively low fiber density in comparison with the second interlacement parts 2. When observed in cross section, the first interlacement parts 1 are more projected to the surface of at least one side than the second interlacement parts 2. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a nonwoven fabric and a wiping material using the same.

  In order to give various functions to a nonwoven fabric, a nonwoven fabric provided with a pattern according to the application has been proposed. Patent Document 1 discloses a nonwoven fabric that is used for, for example, a bandage and has a large number of apertures formed on almost the entire surface. In the large number of openings, openings having various sizes and / or shapes are mixed so that a body fluid or the like is difficult to pass through. Patent Document 2 discloses a non-woven fabric that has been devised to improve its function as a wiping material, for example. In this non-woven fabric, there are alternately open rows and non-open rows in which through holes are continuously connected.

  Patent Document 3 discloses a composite in which a nonwoven fabric support and a nonwoven fabric are integrated, a bulky portion and a non-bulky portion are formed on one side of the nonwoven fabric, and the liquid absorbency is improved. Patent Document 4 discloses a method in which a fiber web is placed on a support sheet and integrated by performing a water flow treatment in a streak shape.

JP-A-63-182460 JP 2000-45161 A Japanese Patent Application Laid-Open No. 2003-103677 JP 2004-313559 A

  However, the non-woven fabrics of Patent Document 1 and Patent Document 2 are, for example, resin sheets laid on the floor of a supermarket or kitchen floor that are used as they are, a comparison of sand grains, bread crumbs, tobacco leaves, etc. on a flooring floor In order to wipe off a surface having large dust, the wiping performance is insufficient, and there is a demand for improvement. Moreover, since the nonwoven fabric of patent document 3 and patent document 4 has a bulky part, it is possible to wipe off with comparatively big dust, but the bulky part has weak intensity | strength and a nonwoven fabric is easy to deform | transform at the time of wiping off. In addition, there are many missing fibers and there is a demand for improvement.

  In order to solve the above-described conventional problems, the present invention provides a nonwoven fabric having high functionality and design and a wiping material using the nonwoven fabric.

  The non-woven fabric of the present invention is a non-woven fabric containing a fiber assembly, wherein the non-woven fabric is entangled with the constituent fibers by needle punching, and the portion remaining in this state is the first entangled portion, and further, the constituent fibers at predetermined locations of the non-woven fabric The first entangled part and the second entangled part are separated from each other in a plurality of rows, and the first entangled part is compared with the second entangled part. The fiber density is relatively low, and the first entangled part protrudes from the second entangled part to at least one surface when observed from a cross section.

  The wiping material of this invention contains the said nonwoven fabric, It is characterized by the above-mentioned.

  Since the nonwoven fabric of the present invention is more strongly entangled with the fibers of the second entangled portion, the strength of the entire nonwoven fabric is high and the durability is improved while having the functionality of the first entangled portion. In the nonwoven fabric of the present invention, the first entangled portion and the second entangled portion are separated from each other and exist in a plurality of rows, and when observed from a cross section, the first entangled portion is at least one side of the second entangled portion. Since it protrudes from the surface, it is excellent in design.

  In addition, when the nonwoven fabric of the present invention is used as a wiping material, the first entangled portion and the second entangled portion are separated from each other and exist in a plurality of rows, and the first entangled portion is in the second entangled portion. In comparison, the fiber density is relatively low, and when observed from a cross section, the first entangled portion protrudes from the second entangled portion at least on one surface, thereby improving dust collection and relatively large. Dust can also be collected efficiently, and a wiping material with high wiping performance can be provided. That is, since the first entangled portion has a relatively low fiber density compared to the second entangled portion and the degree of freedom of the fiber is large and bulky, the dust is not only in the surface portion of the nonwoven fabric but also inside the nonwoven fabric. Can be imported. Moreover, since the first entangled portion is entangled with the constituent fibers by needle punching, a unique punching hole is opened, and dust can be taken into this. As a result, a wiping material having high wiping performance can be provided. In addition, since the first entangled portion entangles the fibers by needle punching, the deformation of the nonwoven fabric and the dropout of the fibers are suppressed compared to the web, and the back contamination on the surface to be wiped off when rubbed strongly as a wiper is suppressed. You can also.

FIG. 1A is a plan view of a nonwoven fabric according to an embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along the line II. FIG. 2A is a plan view of a nonwoven fabric according to another embodiment of the present invention, and FIG. 2B is a sectional view taken along line II-II. FIG. 3 is an explanatory diagram of a needle punching process in one embodiment of the present invention. FIG. 4 is a side view of a needle used for needle punching. FIG. 5 is a perspective view of a needle board on which needles used for needle punching at the time of forming the second entangled portion are implanted. FIG. 6 is a process explanatory diagram of water entanglement processing in one embodiment of the present invention. FIG. 7 is a cross-sectional view of a nozzle used in the hydroentanglement process of FIG.

  The nonwoven fabric of this invention contains a fiber assembly as a main component. A main component means here the component whose content is 60-100 mass% with respect to the whole mass of a nonwoven fabric. The fiber may be any fiber as long as it is normally used as a web (an aggregate in which a large number of fibers are arranged). For example, natural fibers typified by cotton, hemp, wool, rayon, cupra, regenerated fibers typified by solvent-spun cellulose (for example, trade names “Lyocell”, “Tencel”), semi-synthetic fibers typified by acetate, Synthetic fibers such as polyester, polyolefin, nylon, and acrylic can be used. Examples of substances that can be used by mixing with fibers include pulp. The fiber fineness is preferably 0.1 to 60 dtex, more preferably 1 to 30 dtex, and still more preferably 1.5 to 10 dtex. It is preferable for the fineness to be within this range because the difference in thickness between the first entangled portion and the second entangled portion can be easily increased. If the fineness is large, the nonwoven fabric is bulky, which is preferable, but if it exceeds 60 dtex, it is difficult to make the thickness of the second entangled portion smaller than the thickness of the first entangled portion, or sufficient entanglement as a wiping material In some cases, the fibers are not obtained, and the fibers are likely to fall out. Moreover, if the fineness is less than 0.1 dtex, it is difficult to make the first entangled portion bulky, and a difference in thickness from the second entangled portion becomes difficult to occur.

  The nonwoven fabric of this invention is comprised with the web which arranged the fiber in the predetermined direction. The form of the fiber web can be a card web such as a parallel web, a cross web, a Chris cross web, a semi-random web and a random web, a short fiber web such as an air lay web and a wet paper web, and a long web such as a spunbond web and a meltblown web. Any form selected from a fibrous web or the like may be used. The fiber web is preferably a short fiber web, and more preferably a card web, considering the entanglement of the fibers and the bulkiness of the nonwoven fabric. When the fiber web is a short fiber web, the fiber length of the fiber is preferably 5 to 110 mm, more preferably 25 to 80 mm, and still more preferably 35 to 70 mm, considering the entanglement of the fibers. In addition, the fiber layer may be a single layer, or fibers of different materials may be laminated.

  The shape of the constituent fibers of the fiber assembly used in the nonwoven fabric of the present invention is not particularly limited, and examples thereof include single fibers, sheath-core type composite fibers, split type composite fibers, and fibers having irregular cross sections. Examples of the irregular cross section include a Y shape, a W shape, a polygon such as a triangle, a star polygon, a tripas shape, and a flat shape. It is preferable to include a fiber having an irregular cross section because the wipeability of the nonwoven fabric is improved and the bulkiness is improved. In addition, it is preferable to include a fiber having an irregular cross section because the filtration efficiency is improved when used as a filter. In addition, it is preferable to use a fiber having a hollow cross section because the bulkiness of the nonwoven fabric is improved. When used as a filter, it is preferable because pressure loss is reduced due to the improved bulkiness.

  The constituent fibers of the fiber assembly include one or more materials. When the constituent fibers are composed of two or more kinds of materials, at least one of the two or more kinds of materials contains a material having a relatively lower melting point than other materials. It is preferable that the constituent fibers can be fused together while maintaining good. Here, when the constituent fiber is made of two or more materials, the fiber assembly is made of one kind of constituent fiber and the constituent fiber itself is made of two or more materials, and the fiber assembly is made of two kinds of materials different from each other. Including the above-described constituent fibers. The same applies to the following.

  It is preferable that the nonwoven fabric of the present invention contains a heat-sealing fiber. When heat-sealable fibers are included, they are heat-sealable with adjacent fibers, so that the shape stability of the nonwoven fabric is improved, and a decrease in thickness due to use is also suppressed. Moreover, since such a nonwoven fabric is hard to elongate, it is suitable for a wiping material, can be easily wiped, and can provide a wiping material that can be wiped lightly without applying force. Moreover, since such a nonwoven fabric is heat-seal | bonded with fibers, the fluff of a fiber can be suppressed and when used as a wiping material, the back contamination with respect to the wiping target surface can be suppressed. Such a heat-sealing fiber is preferably contained in an amount of 5 to 50% by mass with respect to the total mass of the nonwoven fabric. 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.

  When the nonwoven fabric of the present invention contains fibers having a thick fineness of 3 dtex or more, the bulkiness of the nonwoven fabric is easily obtained, which is preferable. In addition, it is preferable to include fibers having a large fineness because the distance between the fibers is larger than that of a nonwoven fabric having the same density and a finer fineness, so that dust can be easily taken in when used as a wiping material. Such a fiber having a large fineness is preferably contained in an amount of 30% by mass or more, more preferably 50% by mass or more, and further preferably 70% by mass or more with respect to the total mass of the nonwoven fabric. .

  When the nonwoven fabric of the present invention contains polyester fibers, it is preferable because the fibers themselves are stiff, the melting point is high, they are difficult to sag by heat treatment during the production of the nonwoven fabric, and the cost is low. Such polyester-based fibers are preferably contained in an amount of 30% by mass or more, more preferably 50% by mass or more, and more preferably 70% by mass or more based on the total mass of the nonwoven fabric. Further preferred.

  Further, the constituent fibers of the nonwoven fabric may contain 10% by mass or more of hydrophilic fibers. More preferably, it is 30 mass% or more. When hydrophilic fibers such as rayon and pulp are included, the affinity with water is high and the wiping efficiency is improved. Moreover, when hydrophilic fiber is contained in said range, when performing hydroentanglement, the confounding property of a fiber is good and the formation property of the regular pattern mentioned later becomes good. When a nonwoven fabric consists of a single layer, it is preferable that a hydrophilic fiber is 80 mass% or less. In particular, when the fineness of the hydrophilic fiber is 3 dtex or less, it is preferably 50% by mass or less. This is because, when the content of the hydrophilic fiber is large, the resistance is increased when the wet wiping target is wiped off.

  The nonwoven fabric of the present invention may have a laminated structure of two or more layers. For example, when a layer mainly containing hydrophilic fibers is included, excellent wiping properties can be obtained as a wiping material by holding a chemical solution or the like. 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. In addition, in the case where a layer mainly containing hydrophilic fibers such as pulp is included as an intermediate layer, it is preferable that the second entangled portion is formed by hydroentanglement because a regular pattern described later can be made clear. Here, “mainly” means that the layer mainly containing hydrophilic fibers contains 50% by mass or more of hydrophilic fibers as a main component. When a layer mainly containing hydrophilic fibers is included as an intermediate layer, it is not necessary to include hydrophilic fibers as fibers of the surface layer of the nonwoven fabric, and if only hydrophobic fibers are used, there is a sense of resistance when wiping a wet wipe object. Less and preferable. However, when the basis weight and thickness of the surface layer are large, it is difficult for the surface layer to absorb moisture only with hydrophobic fibers, so that hydrophilic fibers may be included or the basis weight and thickness may be adjusted as appropriate.

  In addition, when the nonwoven fabric of the present invention has a laminated structure of two or more layers, a spunbond nonwoven fabric, a meltblown nonwoven fabric, a spunbond / meltblown / spunbond (SMS) nonwoven fabric, a history orthogonal type nonwoven fabric, a net made of resin, a scrim, etc. Laminating the woven fabric is preferable because the shape retention of the nonwoven fabric is enhanced. 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.

Constituent fibers are entangled by needle punching over the entire surface of the fiber web containing the fibers. This technique is a technique in which the constituent fibers are entangled into a felt shape by piercing up to several tens / cm ² or more, and in some cases, several thousand / cm ² with a needle having a web layer. A portion that is entangled with the constituent fibers by the needle punch and corresponds to a portion other than a portion that forms the next second entangled portion is defined as a first entangled portion. The processing by the needle punch can be performed using a normal needle punch machine. As a condition for the needle punching process, it is preferable to use a needle board in which a needle (needle) is implanted, and move the needle board up and down from above or below the fiber web so that the needle penetrates the fiber web. At this time, the vertical movement of the needle board may be adjusted so that the needle depth is 3 to 20 mm. It is preferable to use needles having 3 to 9 barbs and 36 to 42 counts. Further, it is preferable to adjust the needle density and the web conveyance speed so that the number of penetrations (the number of needles driven per unit area) is 10 to 500 / cm ² . When the number of penes is less than 10 / cm ² , the fiber entanglement becomes weak and the dropout of the fiber may increase. When the number of penets exceeds 500 / cm ² , the entanglement of the fibers becomes strong, and the bulkiness of the first entangled portion may be reduced. A preferable range of the pene number is 30 to ²⁰⁰ / cm ² .

  In addition, as long as this 1st entangled part is a range with the effect of this invention, you may perform operation, such as heat-seal | fusing component fibers by heat processing, and is a structural requirement of this invention, "this state The term “remaining at” is also included when such an operation is performed. When the constituent fibers are entangled with a needle punch, a bulky nonwoven fabric can be obtained, and when used as a wiping material, the fiber density is low and the degree of freedom of the fibers is large and bulky. Moreover, dust can be taken not only into the surface portion of the nonwoven fabric but also into the nonwoven fabric. Further, since the constituent fibers are entangled by the needle punch, a unique punching hole is opened, and dust can be taken into this. As a result, a wiping material having high wiping performance can be provided. In addition, because the fibers are entangled, the strength of the nonwoven fabric is higher than that of the web, and it is possible to suppress deformation of the nonwoven fabric and dropout of the fibers, and to suppress back-contamination on the surface to be wiped when rubbed strongly as a wiper. it can.

  Furthermore, the constituent fibers at predetermined positions of the nonwoven fabric are entangled to form a second entangled portion. The second entangled portion may be formed by needle punching or may be hydroentangled. By forming the second entangled portion, the entanglement of the fibers in the second entangled portion is more strongly applied, so the strength of the entire nonwoven fabric is high and the durability is improved. When the second entangled portion is formed by hydroentanglement, the fibers are entangled more strongly than when formed by needle punching, which is preferable in that a stronger nonwoven fabric can be obtained. In addition, when the second entangled portion is formed by hydroentanglement treatment, since the hydroentangled portion exists at predetermined intervals while maintaining the characteristics (bulkyness etc.) of the needle punched nonwoven fabric, the needle punched nonwoven fabric and the hydroentangled portion are present. A non-woven fabric having the function of non-woven fabric can be obtained. The hydroentanglement process is performed by placing the fiber web on the conveyance support and jetting the water stream on one or both sides of the web. At this time, the constituent fibers are entangled to obtain a nonwoven fabric. The hydroentanglement treatment conditions can be appropriately set according to the basis weight of the fiber web, the speed of the conveyance support, and the like. For supplying the water flow, for example, one or more nozzles having a plurality of orifices (openings) arranged so that the longitudinal direction thereof is orthogonal to the traveling direction of the fiber web 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 web. preferable. As shown in FIG. 7, the orifice forms an orifice group 72 composed of one or more orifices 71, and the interval d between adjacent orifice groups is preferably 2 mm or more. A preferable upper limit is 300 mm, and a more preferable range is 5 to 150 mm. When obtaining the nonwoven fabric used as a wiping material, a preferable upper limit is 50 mm, and 5-30 mm is more preferable. The width c of one orifice group is preferably 2 mm or more. A preferable upper limit is 300 mm, and a more preferable range is 5 to 150 mm. When obtaining the nonwoven fabric used as a wiping material, a preferable upper limit is 50 mm, and 5-30 mm is more preferable. When the orifice group is composed of two or more orifices, the interval between adjacent orifices in the orifice group is preferably 0.2 to 1.5 mm. And using such a nozzle, it is good to inject the water flow of 1-20 Mpa of water from the front and back sides of a fiber web 1 to 4 times each. If the water pressure is less than 1 MPa, entanglement between fibers becomes insufficient, and fluffing may easily occur in the obtained nonwoven fabric. When the water pressure exceeds 20 MPa, the entanglement between the fibers becomes too strong, the degree of freedom of the fibers decreases, the texture becomes hard, and the fibers may be torn off.

  Moreover, when forming a 2nd entanglement part by a hydroentanglement, it also becomes possible to form a regular pattern in a 2nd entanglement part. The regular pattern is a pattern in which the structural unit constituting the pattern is selected from, for example, at least one selected from the group consisting of irregularities and apertures. Specific examples include a dot (circle, ellipse, triangle, polygon, etc.) pattern, a herringbone pattern, a checkered pattern, a lattice pattern, a staggered pattern, a zigzag pattern, and the like.

  As a method for forming such a regular pattern, a support having these regular patterns may be used. 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.

  Each regular pattern has various functions and effects. For example, a dot pattern in which apertures are formed at a predetermined interval contributes to improving scraping performance. In the herringbone pattern, the relatively high and low density portions of the fiber are repeated with a small period, so that a capillary phenomenon or the like is likely to occur and the water absorption of the nonwoven fabric is improved. Therefore, if a plurality of types of patterns are applied, a nonwoven fabric having a plurality of functions can be provided.

When the structural unit of the regular pattern is an opening, when the area of the opening and the distance between the openings are in the following ranges, a nonwoven fabric suitable for a wiping material having excellent dust collecting ability can be provided. Preferably the area of the apertures is 0.1~6.0mm ^2, more preferably a 0.3~5.5mm ^2. The distance between the openings closest to each other is preferably 1.0 to 3.0 mm, and more preferably 1.5 to 3.0 mm.

In the case where the second entangled portion is formed by needle punching, as shown in FIG. 5, in the needle board in which the needle is implanted, a needle group having a width of 2 mm or more in the direction intersecting the conveying direction of the fiber web It is preferable to use a needle board in which needles are implanted so that the interval b between adjacent needle groups is 2 mm or more. A preferable upper limit of the width a of the needle group is 300 mm, and a more preferable range is 5 to 150 mm. Moreover, when obtaining the nonwoven fabric used as a wiping material, the upper limit with a preferable needle group is 50 mm, and it is more preferable in it being 5-30 mm. A preferable upper limit of the interval b between adjacent needle groups is 300 mm, and a more preferable range is 5 to 150 mm. When obtaining the nonwoven fabric used as a wiping material, the preferable upper limit of the space | interval of an adjacent needle group is 50 mm, and it is more preferable in it being 5-30 mm. The needle punching process during the second entanglement may be performed by adjusting the needle density and the fiber web conveyance speed so that the number of penets is 30 to 700 / cm ² . When the number of penes is less than 30 / cm ^2, it is difficult to provide a difference in thickness (density) from the first entangled portion. If the number of penes exceeds 700 / cm ² , the fiber entanglement becomes strong, but when used as a wiping material, the second entangled part hardly contributes to wiping properties. A preferable range of the pene number is 50 to 400 / cm ² .

  In this way, the first entangled portion and the second entangled portion are separated from each other and exist in a plurality of rows. Thereby, the first entangled part has a relatively low fiber density compared to the second entangled part, and the first entangled part protrudes from the second entangled part to at least one surface when observed from the cross section. Is obtained. In this nonwoven fabric, the first entangled portion is bulky and has a low density, so that dust having a large particle diameter can be collected, and small dust can be collected at a high density portion of the second entangled portion. Moreover, this nonwoven fabric is excellent in design, and since there are a plurality of first entangled portions with a large thickness and second entangled portions with a small thickness in a row, it is folded along the row direction. It becomes easy. When the 1st entanglement part when it observes from a cross section protrudes from both surfaces from the 2nd entanglement part, since it has the wiping property excellent in both surfaces and a nonwoven fabric can be used effectively, it is preferable. Moreover, when the 1st entanglement part when it observes from a cross section protrudes only on the surface of one side from the 2nd entanglement part, since attachment to a wiping apparatus becomes easy, it is preferable.

In a state where a load of 3 g is applied per 1 cm ^{2 of the} nonwoven fabric, the first entangled portion preferably has a fiber density lower by 0.005 to 0.14 g / cm ³ than the second entangled portion. Thereby, dust collection property improves further, comparatively big dust can also be collected efficiently, and wiping performance can be improved. A more preferable range is 0.006 to 0.12 g / cm ³ . When the second entangled part is formed by the hydroentanglement process, the first entangled part preferably has a fiber density lower by 0.04 to 0.12 g / cm ³ than the second entangled part. When the second entangled portion is formed by needle punching, the first entangled portion preferably has a fiber density lower by 0.006 to 0.10 g / cm ³ than the second entangled portion.

In a state where a load of 3 g is applied per 1 cm ^{2 of the} nonwoven fabric, the fiber density of the first entangled portion is preferably 0.015 to 0.10 g / cm ³ . A more preferable range is 0.020 to 0.080 g / cm ³ . When the fiber density is less than 0.015 g / cm ³ , the strength of the nonwoven fabric is weak, and when used as a wiping material, the nonwoven fabric is likely to be deformed and the fibers are likely to fall off. When the fiber density exceeds 0.10 g / cm ³ , the degree of freedom of the fiber becomes small and it becomes difficult to take in dust.

In a state where a load of 3 g is applied per 1 cm ^{2 of the} nonwoven fabric, the fiber density of the second entangled portion is preferably 0.080 to 0.25 g / cm ³ when the second entangled portion is formed by hydroentanglement treatment. A more preferred upper limit is 0.15 g / cm ³ . Further, when the second entangled portion is formed by needle punching is preferably 0.020~0.15g / cm ^3, more preferable upper limit value is 0.10 g / cm ^3.

In the nonwoven fabric, in a state where a load of 3 g is applied per 1 cm ² of the nonwoven fabric, the first entangled portion preferably protrudes from the second entangled portion by 0.3 to 2.0 mm on the surface of at least one side. Thereby, dust collection property improves further, comparatively big dust can also be collected efficiently, and wiping performance can be improved. More preferably, it protrudes 0.4 to 1.8 mm, and more preferably 0.5 to 1.6 mm.

The basis weight of the nonwoven fabric is not particularly limited as long as it is generally a basis weight that can be processed by needle punching, but is preferably in the range of 40 to 300 g / m ² . This range is convenient as a wiping material. A more preferable range is 50 to 200 g / m ² , and a further preferable range is 60 to 150 g / m ² . Moreover, if it is use, such as a sound-absorbing material, it is preferable that it is the range of 100-500 g / m < ² >.

When the nonwoven fabric of the present invention is used as a wiping material, the 10% elongation stress in the direction perpendicular to the longitudinal direction of the first and second entangled portions is preferably 0.1 N / 5 cm or more. More preferably, it is 8 N / 5 cm or more. Within this range, the nonwoven fabric is less likely to sway during wiping and the durability as a wiping material is improved, which is preferable. However, if this 10% elongation stress is too large, the wiping property may be lowered. Therefore, if the basis weight is 40 to 300 g / m ² , the preferable upper limit value is 50 N / 5 cm, and more preferable upper limit value. Is 30 N / 5 cm.

  The width of the first entangled portion of the nonwoven fabric is preferably 2 mm or more, and the width of the second entangled portion is preferably 2 mm or more. The upper limit value may be set freely depending on the use of the nonwoven fabric. For example, in the nonwoven fabric in use, the upper limit value may be set so that there are two or more rows of first and second entangled portions. A preferable upper limit value of the width of the first interlaced part or the width of the second interlaced part is 300 mm, and a more preferable range is 5 to 150 mm. In the use of the wiping material, a preferable width of the first entangled portion is 2 to 50 mm, and a preferable width of the second entangled portion is 2 to 50 mm. Thereby, dust collection property improves further, comparatively big dust can also be collected efficiently, and wiping performance can be improved. A more preferable range is that the width of the first entangled portion is 5 to 30 mm. In the use of the wiping material, the shorter the width of the second entangled portion, the better the wiping property, the more preferable upper limit is 30 mm or less, the further preferable upper limit is 15 mm, and the particularly preferable upper limit is 5 mm. Moreover, in the use of the wiping material, the value of the ratio of the width of the first interlaced portion and the width of the second interlaced portion (the width of the first interlaced portion / the width of the second interlaced portion) is 1 to 8. Since the wiping property is improved, the range is preferably 2 to 6.

  The width of the first interlaced part and the width of the second interlaced part do not need to be the same and may be different. Further, the widths of the plurality of first interlaced parts do not have to be the same. The widths of the plurality of second entangled portions need not be the same. The width of the plurality of first entangled portions or second entangled portions of the nonwoven fabric of the present invention is gradually increased along the CD direction (lateral direction) or MD direction (longitudinal direction) of the nonwoven fabric in order to improve the design properties of the nonwoven fabric. It may be bigger.

  In the nonwoven fabric of the present invention, a repeating unit in which the widths of the plurality of first entangled portions sequentially increase in the direction orthogonal to the longitudinal direction may be repeated a plurality of times. Regarding the widths of the plurality of second entangled portions, a repeating unit that gradually increases in the direction orthogonal to the longitudinal direction may be repeated a plurality of times. When the nonwoven fabric is used as a wiping material, the particle size of the dust that is easily captured and the type of the dust are different depending on the width of the first entangled portion or the second entangled portion. Having the entangled portion or the second entangled portion is preferable because various types of dust can be collected.

  In addition, with conventional wiping materials that have a solid surface or a large number of openings formed on the entire surface, dust is concentrated at the edge of the surface of the wiping material that comes into contact with the surface to be wiped. Therefore, the central part of the surface of the wiping material that contacts the surface to be wiped cannot be used effectively for wiping. However, when the repeating unit in which the width of the plurality of first entangled portions or the second entangled portions is sequentially increased multiple times toward the direction orthogonal to the longitudinal direction is repeated for the following reasons, The dust collecting ability at the center of the surface in contact with the surface to be wiped is higher than that of a conventional non-woven fabric wipe.

  As described above, when the width of the first entangled portion or the second entangled portion is different, the particle diameter of dust that is easily captured and the type of dust are different. Therefore, of the wiping material, dust that has not been captured by the first entangled portion or the second entangled portion located at the edge of the surface that comes into contact with the surface to be wiped, such as the floor, enters inside the edge, and the edge It was captured by the first interlaced part or the second interlaced part having a different width located inside the first interlaced part or the second interlaced part located in the first entangled part or the second interlaced part, and was not captured by the first entangled part or the second interlaced part. Dust is further captured by the first entangled portion or the second entangled portion having different widths located on the inner side. Therefore, when it is a nonwoven fabric in which the repeating unit in which the width of the first entangled portion or the second entangled portion sequentially increases in the direction orthogonal to the longitudinal direction is a plurality of times, the plurality of first entangled portions Or dust collection ability is better than the nonwoven fabric in which the width of the 2nd entanglement part is equal.

  Moreover, the width | variety of all the 1st entanglement parts contained in a nonwoven fabric does not need to satisfy | fill said range, and unless the effect of this invention is impaired, the nonwoven fabric of this invention is not included in the width | variety of said range. There may be a first interlaced portion. Regarding the second entangled portion, the widths of all the second entangled portions included in the nonwoven fabric do not need to satisfy the above range, and as long as the effect of the present invention is not impaired, the second entangled portion is not included in the width of the above range. There may be two entangled portions. Of the first entangled portions included in the nonwoven fabric of the present invention, the number of columns of the first entangled portion whose width satisfies the above range is 50% or more of the total number of columns of the first entangled portions included in the nonwoven fabric. It is preferable because it exhibits better wiping properties as a wiping material. It is more preferable that 70% or more is included. In addition, among the second entangled portions included in the nonwoven fabric of the present invention, the number of columns of the second entangled portion whose width satisfies the above range is 50% of the total number of columns of the second entangled portions included in the nonwoven fabric. If it is contained, it is preferable because it shows better wiping properties as a wiping material. It is more preferable that 70% or more is included.

  The first entangled portion and the second entangled portion in the nonwoven fabric of the present invention may be parallel to either the MD direction or the CD direction as long as the effect of the present invention is ensured, but is parallel to the MD direction. Preferably there is. Usually, since the tension in the MD direction is applied to the fiber assembly in the manufacturing process of the nonwoven fabric, when forming the first entangled portion and the second entangled portion along the MD direction, a desired width of the entangled portion is obtained. In the case where the second entangled portion is formed by hydroentanglement and a regular pattern is obtained, it is preferable because it can be stably formed.

  The nonwoven fabric of the present invention is suitably used as a wiping material, but other uses include air filters, liquid filters, absorbent articles (particularly absorbent base fabrics), carpet surface materials, heat exchangers, and dew condensation. Prevention sheet, wallpaper, cushioning material, sound absorbing material, heat insulating material, heat insulating material, seeding sheet, base material for poultice, core for sponge, sponge, mat, liquid holding material, desiccant / adsorbent / deodorant, etc. It is also suitable for various uses such as storage items. In applications such as carpet surface materials, wallpaper, cushion materials, sound absorbing materials, heat insulating materials, heat insulating materials, seeding sheets, sponges, mats, and liquid holding materials, the excellent design properties of the nonwoven fabric of the present invention can be exhibited. In applications such as heat exchangers and anti-condensation sheets, desired performance can be exhibited by the presence of the second entangled portion like a groove. In applications such as a liquid wick, the life of the second entangled portion can be increased and the wicking property of the first entangled portion can be set low to increase the life when used as a fragrance. . In addition, by alternately stacking a plurality of layers of non-woven fabrics, a space can be formed in the second entangled portion using the difference in thickness between the first entangled portion and the second entangled portion. Such a laminated nonwoven fabric can be used as a stored item containing a desiccant, an adsorbent, a deodorizing agent, and the like.

  In order to obtain the nonwoven fabric of the present invention, as an example, short fiber aggregates are opened with a card, and constituent fibers are arranged in a predetermined direction to form a web, and this web is first configured by needle punching as a first step. The fibers are entangled, and then, as a second step, a predetermined portion is needle punched or hydroentangled to form a second entangled portion.

  Next, it demonstrates using drawing. FIG. 1A is a plan view of a nonwoven fabric in one embodiment of the present invention, and FIG. 1B is a cross-sectional view thereof. This nonwoven fabric 10 is composed of a first entangled portion 1 and a second entangled portion 2, and the entire surface is first entangled with constituent fibers by needle punching, and then a hydroentangled portion is formed thereon to form a second entangled portion 2. Has been. Thereby, parts other than the 2nd entanglement part 2 become the 1st entanglement part 1, and the 1st entanglement part and the 2nd entanglement part are mutually spaced apart, and multiple rows exist. Further, as shown in FIG. 1B, the first entangled portion 1 has a relatively low fiber density compared to the second entangled portion 2, and the first entangled portion 1 is more than the second entangled portion 2 when observed from the cross section. A non-woven fabric protruding on the surface is obtained.

  FIG. 2A is a plan view of a nonwoven fabric according to another embodiment of the present invention, and FIG. 2B is a sectional view thereof. The nonwoven fabric 11 is different from FIGS. 1A-B in that the second entangled portion 4 is formed by a needle punching process. That is, both the first entangled portion 3 and the second entangled portion 4 are formed by the needle punching process.

  FIG. 3 is an explanatory diagram of a needle punching process in one embodiment of the present invention. The needle punch processing device 30 introduces the web 22 conveyed by the conveyor 21 between the upper and lower plates of the stripper plate 23 and the bed plate 24, and moves the needle board 26 on which the needle 25 is implanted by the needle beam 27. By doing so, the needle 25 penetrates into the web 22. Holes are drilled in the upper and lower plates according to each penetration position. The processed web 29 is taken out by the delivery rollers 28a and 28b.

  FIG. 4 is a side view of a needle used for needle punching. The needle 40 includes a blade portion 41, a shank portion 43, and a crank portion 44. A plurality of barbs 42 are formed on the blade portion 41 so as to oppose the penetrating direction. There is a function to be entangled.

  FIG. 5 is a perspective view of a needle board on which needles used for needle punching at the time of forming the second entangled portion are implanted. In the needle board 60, the needle group 62 has a width a, and the interval between adjacent needle groups is b. When the adjacent needle groups have a predetermined interval, the first entangled portion and the second entangled portion can be formed.

  FIG. 6 is a process explanatory diagram of the hydroentanglement process in one embodiment of the present invention. This water entanglement processing device 50 further entangles the nonwoven fabric 52 subjected to the first entanglement treatment with a high-pressure water flow (water jet: WJ) 51. A mesh screen 53 is disposed below or above the nonwoven fabric 52, and a roll shell 54 and a decompression line 55 are disposed on the lower side to remove the treated water 56 by suction. The nonwoven fabric after the WJ treatment is dried and wound up. In order to use this nonwoven fabric as a wiping material, it is cut into predetermined dimensions.

  FIG. 7 is a cross-sectional view of a nozzle used in the hydroentanglement process of FIG. The nozzle 70 has an orifice group composed of one or more orifices, the width of the orifice group is c, and the interval between adjacent orifice groups is d. When the adjacent orifice groups have a predetermined interval d, the first entangled portion and the second entangled portion can be formed.

  Hereinafter, the contents of the present invention will be described with reference to examples. The present invention is not limited to these examples.

  Each physical property of the nonwoven fabric obtained by the Example and the comparative example was measured as follows.

(1) Overall thickness including first interlaced portion and second interlaced portion Using a nonwoven fabric thickness measuring machine (trade name “THICKNESS GAUGE”, model: CR-60A, manufactured by Daiei Kagaku Seisakusho Co., Ltd.), JIS L According to 1096, the measurement was performed with a load of 3 g per 1 cm ^{2 of} the sample.

(2) Thickness of each of the first entangled portion and the second entangled portion Using a nonwoven fabric thickness measuring machine (trade name “THICKNESS GAUGE”, model: CR-60A, manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd.) to JIS L 1096 According to the same measurement, a load of 3 g was applied per 1 cm ^{2 of} the sample. During the measurement, only the first entangled portion and only the second entangled portion were cut from the nonwoven fabric and measured.

(3) Tensile strength at break and 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 distance between chucks is 10 cm, and a constant-speed extension type tensile tester (trade name: Tensilon UCT -1T Orienttech Co., Ltd.) was used to elongate the sample piece at a tensile rate of 30 cm / min, and the load value and elongation at break were measured as breaking strength and breaking elongation, respectively.

(4) Stress at 10% elongation Load value at 10% elongation at break strength measurement, that is, load value when stretched 1 cm from the measurement start point (when the distance between chucks (10 cm) is 11 cm) (Load value) was measured as 10% elongation stress.

(5) Fabric weight In accordance with JIS L 1096, test specimens were collected and weighed to determine the mass per 1 m ² (g / m ² ).

(6) Density Density was calculated from thickness and basis weight.

(7) Dust adsorption test On a P tile (manufactured by Sangetsu Co., Ltd.) (length 26 cm, width 60 cm), 0.50 g of JIS dust type 1 was uniformly dispersed in a width of 7 cm length and 20 cm width, and the mass was measured in advance. I left it. Thereafter, the dust was wiped off with the nonwoven fabrics of the examples and comparative examples (length 7 cm, width 12 cm). For wiping, a non-woven fabric sponge (Yamazaki Sangyo Co., Ltd., trade name “Glass Wiper Wiper”, polyethylene sponge pad attached to the product is cut to 70 mm in length and 50 mm in width so that the area contributing to wiping is 35 cm ^2. The mass was set to 4.4 g), and it was reciprocated twice in the CD direction of the nonwoven fabric (direction perpendicular to the longitudinal direction of the first entangled portion) with a weight of 500 g applied. By this measuring method, the mass of the wiping material nonwoven fabric before and after the measurement, the dust adsorption amount and the dust adsorption rate were determined, and the dust adsorption evaluation was performed as follows.
A Dust adsorption rate of 40% or more B Same as above, 30% or more but less than 40% C Same as above, 20% or more but less than 30% D Same as above, less than 20%

[Example 1]
In Example 1, first, as a fiber material, polyethylene terephthalate (PET) single fiber (fineness 6.6 dtex, fiber length 64 mm, trade name “Tetron”, manufactured by Toray Industries, Inc.) and viscose rayon fiber (fineness 1. 7 dtex, fiber length 40 mm, trade name “Corona”, manufactured by Daiwabo Rayon Co., Ltd.) and polypropylene (PP) / polyethylene (PE) core-sheath composite fiber (core PP, sheath PE, PP / PE = 37: 63 (mass ratio) )) (Fineness 1.7 dtex, fiber length 51 mm, trade name “NBF (H)”, manufactured by Daiwabo Polytech Co., Ltd.). Thereafter, PET single fiber, viscose rayon fiber and PP / PE core-sheath composite fiber were uniformly mixed at a mass ratio of 50:30:20 to obtain a parallel card web. The web was processed as shown in Table 1. The needle punching process (hereinafter also referred to as NP) is the method shown in FIGS. 3 to 5, and the needle is RBA-40 (manufactured by Foster Needle, No. 40, barb number 9), and the needle density is 1.4. A needle board having the number of needles / cm ² was used, the number of pens was 50 / cm ² (the number of needles to be driven per unit area), and the entire surface was vertically projected. The needle depth was 8 mm. For the water jet treatment (hereinafter also referred to as WJ), the method shown in FIGS. WJ places the card web on a plain weave PET net with a warp wire diameter of 0.132 mm, a weft wire diameter of 0.132 mm, and a mesh count of 90 mesh. The width of the orifice group and the width of the adjacent orifice group were adjusted so that the width of the first entangled portion and the second entangled portion was as shown in Table 1 with respect to the surface of the surface. Specifically, this is a nozzle adjusted so that one orifice group includes five orifices, the width of one orifice group is 3 mm, and the interval between adjacent orifice groups is 15 mm. Using a nozzle having a hole diameter of 0.13 mm and an interval between orifices included in one orifice group of 0.6 mm, a columnar water flow with a water pressure of 6.0 MPa is jetted to obtain a striped second interlaced portion. It was. After forming the second entangled portion, heat treatment was performed at 135 ° C. for 10 seconds to obtain the nonwoven fabric of Example 1.

[Example 2]
In Example 2, PET single fibers (fineness 1.7 dtex, fiber length 51 mm, trade name “Tetron”, manufactured by Toray Industries, Inc.) were prepared, and two parallel card webs were produced. Between two card webs, a tissue paper (weight per unit: 17 g / m ² , manufactured by Havix Co., Ltd.) composed of 100% by mass of pulp fibers was laminated to form a laminated web composed of three layers. Then, the process shown in Table 1 was performed with respect to the said web. The needle punch process (NP) was performed in the same manner as in Example 1. Thereafter, water jet treatment (WJ) was performed in the same manner as in Example 1 except that the nozzle adjusted so that the width of one orifice group was 6 mm and the interval between adjacent orifice groups was 6 mm, The nonwoven fabric of Example 2 was obtained.

[Example 3]
The water jet treatment (WJ) was carried out in the same manner as in Example 2 except that the nozzle was adjusted so that the width of one orifice group was 12 mm and the interval between adjacent orifice groups was 12 mm. The nonwoven fabric of Example 3 was obtained.

[Example 4]
In Example 4, first, PET single fiber (fineness 1.7 dtex, fiber length 51 mm, trade name “Tetron”, manufactured by Toray Industries, Inc.) and PP / PE core-sheath composite fiber (core PP, sheath PE, PP / PE = 37: 63 (mass ratio)) (fineness 1.7 dtex, fiber length 51 mm, trade name “NBF (H)”, manufactured by Daiwabo Polytech Co., Ltd.) is uniformly mixed at a mass ratio of 85:15, Parallel card web. The web was needle punched. The needle punching process (NP) for forming the first entangled portion was the same as in Example 1 except that the needle depth was 4 mm and the number of penets was 50 / cm ² . In the second entangled portion, the needle is replaced with a conical needle (manufactured by Foster Needle, barb number 9, 38th), in the needle board in which the needle is implanted, in the width in the direction intersecting the conveying direction of the fiber web, A needle group implanted over a width of 25 to 30 mm using a needle board in which the needles are implanted so that the interval between adjacent needle groups is 25 to 30 mm. The number was set to 100 / cm ² to form stripes. After forming the second entangled portion, heat treatment was performed at 135 ° C. for 10 seconds to obtain a nonwoven fabric of Example 4.

[Example 5]
Example 5 is a PET single fiber (fineness 1.7 dtex, fiber length 51 mm, trade name “Tetron”, manufactured by Toray Industries, Inc.) and PP / ethylene-propylene copolymer (EP) eccentric core-sheath composite fiber (core PP, sheath EP, PP / EP = 50: 50 (mass ratio)) (fineness 2.2 dtex, fiber length 51 mm, trade name “CPP”, manufactured by Daiwabo Polytech Co., Ltd.) is uniform at a mass ratio of 70:30 To make a cross lay card web. Thereafter, in the same manner as in Example 4, the first entangled portion and the second entangled portion were formed, and the nonwoven fabric of Example 5 was formed.

[Example 6]
A nonwoven fabric of Example 6 was obtained in the same manner as Example 5 except that heat treatment was performed at 135 ° C. for 10 seconds after forming the second entangled portion. In Example 6, the nonwoven fabric was thermally contracted by the heat treatment, and the widths of the first and second entangled portions were as shown in Table 1.

[Comparative Example 1]
The same card web as in Example 1 was used, and the WJ treatment was performed at a water pressure of 3.0 MPa and once for each of the front and back surfaces of the entire web surface. After WJ treatment, heat treatment was performed at 135 ° C. for 10 seconds.

[Comparative Example 2]
The same card web as in Example 1 was used, and the NP treatment was RBA-40 (manufactured by Foster Needle Co., Ltd., No. 40, number of barbs 9), the number of penets was 100 / cm ^2, and the entire upper and lower bumps were made. . The needle depth was 10 mm. After NP, heat treatment was performed at 135 ° C. for 10 seconds.

[Comparative Example 3]
The same card web as in Example 1 was used, and the NP treatment was RBA-40 (manufactured by Foster Needle Co., Ltd., No. 40, number of barbs 9), the number of penets was 100 / cm ^2, and the entire upper and lower bumps were made. . The needle depth was 8 mm. The WJ treatment after NP was a water pressure of 3.5 MPa, and the treatment was performed once for each of the front and back surfaces of the entire web.

  The above conditions are summarized in Table 1 below. Moreover, the physical property of the nonwoven fabric of Examples 1-6 and Comparative Examples 1-3 was measured as mentioned above, and the result was shown in following Table 1. In Table 1, MD is the machine direction (longitudinal direction) of the nonwoven fabric, and CD is the width direction (lateral direction).

  When comparing the data of Examples 1 to 6 and Comparative Examples 1 to 3 in Table 1, the entire surface of the nonwoven fabric of Example 1 is formed by Comparative Example 1 of the nonwoven fabric by hydroentanglement and the second entanglement in Example 1. Although the strength of the nonwoven fabric was inferior to that of the nonwoven fabric of Comparative Example 3 in which the WJ treatment was performed on the entire surface of the nonwoven fabric, good results were shown for the wiping performance. This is because in the nonwoven fabric of Example 1, the portion entangled with NP (first entangled portion) is appropriately entangled, and the degree of freedom of the fibers is large, so that dust is easily taken up. Moreover, compared with the comparative example 2 whose whole surface is a nonwoven fabric by NP entanglement, the direction of Example 1 had a larger breaking strength and 10% elongation stress. That is, the nonwoven fabric of Example 1 has two functions of wiping performance and strength of the nonwoven fabric, which cannot be possessed by conventional hydroentangled nonwoven fabrics and NP nonwoven fabrics. Therefore, the nonwoven fabric of Example 1 is a nonwoven fabric that exhibits good wiping properties and is less likely to be deformed or have fibers dropped during wiping.

  In addition, when Example 2 and Example 3 are compared, Example 3 has better wiping performance. This seems to be because the larger the width of the low entanglement (NP) portion, the more the dust can be entangled during wiping. Further, in Example 5 and Example 6, Example 5 has better wiping performance. This is because the nonwoven fabric of Example 6 was heat-treated and the constituent fibers were crimped and bulky, but the density also increased, the degree of freedom of the fibers was lost and the bulk was too high, and the high density portion (second This is probably because the contribution to the wiping of the entangled part) was small. However, the nonwoven fabric of Example 6 is a nonwoven fabric having a great difference in thickness between the first entangled portion and the second entangled portion and excellent in design. Moreover, since it was high-strength and especially strong in the CD direction, the nonwoven fabric was difficult to twist during wiping.

  Moreover, when Example 1 and Examples 2-6 are compared, the wiping property of Example 1 is good. This is considered to be due to the use of fibers having a large fineness (6.6 dtex), and the nonwoven fabric of Example 1 was actually easy to take up dust. In addition, regarding the value of the ratio of the width of the first interlaced portion and the width of the second interlaced portion (the width of the first interlaced portion / the width of the second interlaced portion), Example 1 is 5, Examples 2-5 1 is 1 and Example 6 is about 0.7, the largest value of Example 1 is considered to be the reason why the wiping property of Example 1 was good.

  The nonwoven fabric of the present invention is suitable for wiping off surfaces having relatively large dust, such as resin sheets and flooring floors, which are laid on, for example, supermarket floors and kitchen floors. In addition, air filters, liquid filters, absorbent articles (especially absorbent fabrics), carpet surface materials, heat exchangers, anti-condensation sheets, wallpaper, cushioning materials, sound absorbing materials, heat insulating materials, heat insulating materials, It is also suitable for various uses such as seeding sheets, poultice base fabrics, liquid wicks, sponges, mats, liquid holding materials, stored items containing desiccants, adsorbents, deodorants and the like.

DESCRIPTION OF SYMBOLS 1,3 1st entangled part 2,4 2nd entangled part 10,11 Nonwoven fabric 21 Conveyor 22 Web 23 Stripper plate 24 Bed plate 25, 40, 61 Needle 26 Needle board 27 Needle beam 28a, 28b Delivery roller 29 Web 30 after processing Needle punch processing device 41 Blade portion 42 Barb
43 Shank part 44 Crank part 50 Hydroentanglement processing device 51 High-pressure water stream (water jet: WJ)
52 Nonwoven fabric 53 subjected to first entanglement treatment 53 Mesh screen 54 Roll shell 55 Depressurization line 56 Treated water 60 Needle board 62 with needles implanted Needle group 70 Nozzle 71 Orifice 72 Orifice group

Claims (6)

A nonwoven fabric comprising a fiber assembly,
The nonwoven fabric is entangled with the constituent fibers by a needle punch, and the portion remaining in this state is the first entangled portion,
Furthermore, the constituent fibers at predetermined locations of the nonwoven fabric are entangled to form a second entangled portion,
The first entangled part and the second entangled part are separated from each other and exist in a plurality of rows,
The first entangled portion has a relatively low fiber density compared to the second entangled portion,
When observed from a cross section, the first entangled portion protrudes from the second entangled portion at least on one surface. 2. The nonwoven fabric according to claim 1, wherein the first entangled portion has a fiber density lower by 0.005 to 0.14 g / cm ³ than the second entangled portion in a state where a load of 3 g is applied per 1 cm ² of the nonwoven fabric. . ^{3. The} nonwoven fabric according to claim 1, wherein the first entangled portion protrudes from the second entangled portion to a surface of at least one surface by 0.3 to 2.0 mm in a state where a load of 3 g is applied per 1 cm ² of the nonwoven fabric. .   The nonwoven fabric according to any one of claims 1 to 3, wherein the second entangled portion is formed by needle punching or hydroentanglement.   The width of the 1st entangled part is 2 mm or more, and the width of the 2nd entangled part is 2 mm or more, The nonwoven fabric given in any 1 paragraph of Claims 1-4.   The wiping material containing the nonwoven fabric of any one of Claims 1-5.

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