JP4852659B2 - Nonwoven fabric, method for producing the same, and wiping material - Google Patents

Description

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

  In order to give various functions to a nonwoven fabric, a nonwoven fabric having a pattern or the like 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 body fluids and the like are difficult to pass through. Patent Document 2 describes a wiping material in which parallel straight lines and inclined straight lines or curves are combined. Patent Document 3 discloses a nonwoven 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 4 describes a wiping material in which a low entanglement portion is surrounded by a high entanglement portion, where a low entanglement density portion and a high entanglement portion are formed by hydroentanglement.

JP-A-63-182460 Japanese Patent Laid-Open No. 10-117981 JP 2000-45161 A JP 2006-187313 A

  However, since the non-woven fabric described in Patent Document 1 has pores formed on the entire surface of the non-woven fabric, when used as a wiping material, streaks due to dirt are generated, and there is a demand for improvement. The nonwoven fabric described in Patent Document 2 has inclined straight lines and curved portions formed by heat compression, and the fibers are thermally fused and hardened, so there is a demand for improvement in wiping properties. When the nonwoven fabric described in Patent Document 3 is used as a wiping material, it shows good wiping properties when wiped in a direction perpendicular to the longitudinal direction of the aperture row, but the longitudinal direction of the aperture row and its diagonal 45 When wiping in the direction of the degree, wiping lines due to dirt are generated, so there is a demand for improvement. The non-woven fabric described in Patent Document 4 needs to be moved because a high-weight nozzle head needs to be moved in order to form a portion having a high entanglement density, and the cost of equipment increases. In addition, the portion with high entanglement density (high entanglement portion) is formed by water entanglement, but this high entanglement portion is simply a nozzle line due to water flow, and there is a demand for improvement in terms of functionality and design. .

  In order to solve the above-described conventional problems, the present invention provides a nonwoven fabric having a high wiping performance, a method for producing the same, and a wiping material.

  The nonwoven fabric of this invention is a nonwoven fabric containing a fiber assembly, Comprising: The said nonwoven fabric has a 1st entanglement part and a 2nd entanglement part, and the said 2nd entanglement part hydroentangles the constituent fiber of the predetermined location of the said nonwoven fabric. The first entangled portion and the second entangled portion are spaced apart from each other and there are a plurality of rows, and at least one of the first entangled portion and the second entangled portion. One side is meandering along one direction of the nonwoven fabric while maintaining an interval of 2 mm or more in width.

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

  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, thereby rearranging a part of the constituent fibers, A method for manufacturing a nonwoven fabric, wherein the second entangled part having a regular pattern and the first entangled part spaced apart from the second entangled part are formed in a plurality of rows, wherein the second entangled part is formed. At the time of the water entanglement forming the part, at least one of the first entangled part and the second entangled part meanders by injecting the pressurized water flow onto the nonwoven fabric through the perforated member and vibrating the perforated member. It is characterized by forming.

  The nonwoven fabric of the present invention has a high wiping performance because the first entangled portion and the second entangled portion having a regular pattern are separated from each other and exist in a plurality of rows. In addition, at least one of the first entangled part and the second entangled part is meandering along one direction of the nonwoven fabric while maintaining an interval of 2 mm or more in width, thereby having high design as a nonwoven fabric, In addition, the wiping material of the present invention exhibits excellent wiping properties regardless of the vertical, horizontal, or diagonal directions, and can provide a wiping material having high wiping performance. In the method for producing a nonwoven fabric of the present invention, the meandering length and amplitude per cycle of the meandering are freely formed by forming the meandering first entangled portion and / or second entangled portion by vibrating the perforated member. In addition, the first entangled portion and / or the second entangled portion meandering without causing wrinkles in the nonwoven fabric can be formed, and a meandering pattern closer to a curve can be formed.

FIG. 1A is a cross-sectional explanatory view of a nonwoven fabric manufacturing process in one embodiment of the present invention, and FIG. 1B is a perspective view thereof. FIG. 2 is an explanatory view of meandering in one embodiment of the present invention. FIG. 3 is a plan view of the nonwoven fabric in one embodiment of the present invention. FIG. 4 is a plan view of the nonwoven fabric in one embodiment of the present invention. FIG. 5 is a plan view of a nonwoven fabric in one embodiment of the present invention. FIG. 6 is a plan view of a nonwoven fabric in one embodiment of the present invention. FIG. 7 is a plan view of a nonwoven fabric of a comparative example. FIG. 8 is a plan view of a nonwoven fabric of a comparative example. FIG. 9A is a plan view of the nonwoven fabric in one example of the present invention, and FIG. 9B is a plan view of the nonwoven fabric in the comparative example. FIG. 10A is a plan view of the nonwoven fabric in one example of the present invention, and FIG. 10B is a plan view of the nonwoven fabric in the comparative example. FIG. 11A is a plan view of a nonwoven fabric in one example of the present invention, and FIG. 11B is a plan view of a nonwoven fabric in a comparative example. FIG. 12A is a plan view of the nonwoven fabric in one example of the present invention, and FIG. 12B is a plan view of the nonwoven fabric in the comparative example. FIG. 13 is a plan view of a nonwoven fabric of a comparative example. FIG. 14 is an explanatory diagram of the shapes of the first interlaced portion and the second interlaced portion in one embodiment of the present invention. FIG. 15 is an explanatory view of the shapes of the first entangled portion, the second entangled portion, and the third entangled portion in one embodiment of the present invention.

  In the present invention, the fiber assembly is not particularly limited as long as the constituent fibers can be rearranged by hydroentanglement. For example, a fiber web, an entangled web, a bonded web, a woven or knitted fabric, or a laminate thereof can be used. The fiber web is not particularly limited as long as the web can be rearranged by hydroentanglement, and examples thereof include a card web, an air lay web, a wet paper web, a long fiber web (for example, a spunbond web), and a meltblown web. Can be mentioned. The entangled web is a fiber aggregate, particularly in a state where the fiber web is entangled, and the entanglement of the fiber web is, for example, needle punching method, hydroentanglement method, steam flow (steam jet) entanglement from the viewpoint of productivity. Although it may be performed by any method such as a method, since the second entangled portion is formed by hydroentanglement, it is preferably performed by hydroentanglement method. The bonded web is a fiber aggregate, in particular, a part of the constituent fibers of the fiber web bonded together. Examples of the bonding method include an embossing method, an air-through method, a chemical bond method, and the like.

  The nonwoven fabric of this invention contains a fiber assembly as a main component. Here, the main component refers to a component having a content of 60 to 100% by mass with respect to the total mass of the nonwoven fabric. In the fiber assembly, the constituent fiber may be any fiber as long as it is normally used as a web (an assembly in which a large number of fibers are arranged). For example, natural fibers such as cotton, hemp, wool, and pulp, regenerated fibers such as rayon, semi-synthetic fibers such as acetate, polyester, polyolefin, nylon, synthetic fibers such as acrylic it can. Moreover, in a fiber assembly, it is preferable that the fiber length of a fiber is 5-110 mm. A more preferable fiber length is 25 to 70 mm. If the fiber length is less than 5 mm, the fiber entanglement is not good. When the fiber length exceeds 110 mm, the strength of the nonwoven fabric becomes weak.

  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 irregular cross-sections include Y-shaped, W-shaped, triangular and other polygonal shapes, star-shaped polygonal shapes, cross-shaped, flattened shapes, and multileaf shapes. In addition, these irregular cross sections may be rounded in outline. It is preferable to include a fiber having an irregular cross section because the wipeability of the nonwoven fabric is improved.

  The constituent fibers of the fiber assembly include one or more materials. When at least one of the two or more materials includes a material having a relatively lower melting point than the other materials, the constituent fibers are fused together while maintaining a regular pattern well. This is preferable. Here, the case where the constituent fiber is made of two or more materials means that the fiber aggregate is made of one or more kinds of constituent fibers and the constituent fiber itself is made of two or more kinds of materials, and the fiber aggregate is made of two different materials. Including the case of consisting of more than one type of constituent fiber. The same applies to the following.

  The fineness of the constituent fibers is preferably 0.1 to 6.6 dtex, preferably 0.25 to 3.3 dtex, because the hydroentanglement is good and a clear pattern can be formed without adversely affecting the fibers. Is more preferable.

  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 fibers used, the basis weight of the nonwoven fabric, etc. may be appropriately set, for example, the nonwoven fabric of the present invention is fine dust, When used as a dry wipe such as a flooring wiper or precision wiper for wiping off dust, etc., or as a wet wipe such as a wet tissue, antiperspirant sheet or makeup remover, the non-woven fabric is non-compatible. It is preferable that it contains 5% by mass or more of split-type composite fibers that are composed of two soluble components and at least one component is divided into two or more in the fiber cross section, and more preferably 10% by mass or more. Examples of the combination of the two components include nylon and polyester, polyester and polypropylene, ethylene-vinyl alcohol copolymer and polypropylene, and polyester and polyethylene. The fineness of these fibers is preferably 3.5 dtex or less because the wiping property is good and the liquid remaining property is low, and because the water entanglement 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 chemical fibers composed of a single component. Among these, polyester fibers and rayon fibers having a fineness of 6.6 dtex or less are preferable.

  It is preferable that 5-50 mass% heat-fused fibers are contained in the constituent fibers of the nonwoven fabric. As a result, a nonwoven fabric having a balance between strength and elongation can be obtained. Moreover, the shape stability of a nonwoven fabric improves and the fall of the thickness accompanying 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. . In such a nonwoven fabric, after forming the second entangled portion having a predetermined regular pattern, the fiber web is heat-treated to fuse at least a part of the constituent fibers to fuse the constituent fibers together. Is obtained.

  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 a hydrophilic fiber is contained in said range, the entanglement property of the fiber at the time of hydroentanglement will be good, and the formation property of a regular pattern will become good.

  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, a wiping material having excellent wiping properties, such as a high-quality wet wiper, a wet tissue, or a wet towel such as a disposable towel, can be obtained by holding a chemical solution or the like. 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 placed on the surface. Since it can be put out gradually, it is preferable. In addition, it is preferable to include a layer mainly containing hydrophilic fibers such as pulp as an intermediate layer because a regular pattern obtained by hydroentanglement treatment 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.

  The nonwoven fabric of the present invention has a first entangled portion and a second entangled portion, and the first entangled portion and the second entangled portion are separated from each other and exist in a plurality of rows. In the present invention, "the first entangled part and the second entangled part are separated from each other and exist in a plurality of rows" means that the first entangled part and the second entangled part exist independently and the first entangled part And a plurality of second entangled portions are formed, that is, a plurality of two types of entangled portions that exist independently are formed. As will be described later, the second entangled portion is formed by entanglement of constituent fibers at predetermined locations of the fiber assembly. On the other hand, the first entangled portion may be in the state of the fiber web, the state of the bonded web, the state of the entangled web, or any of the above-described fiber aggregates, and is not particularly limited. Compared with the fiber, because the entanglement of the fiber is good, the formation of the second entangled part is good, and since the fiber entanglement is strong compared to the fiber web, the fluff of the fiber is suppressed, and the constituent fibers are entangled. It is preferable that it is formed. Further, the entanglement of the fibers may be performed by any method such as needle punching method, hydroentanglement method, steam flow (steam jet) entangling method, etc., because the formation of the second entangled portion is performed by hydroentanglement, It is preferable to carry out by the hydroentanglement method.

  When the first entangled portion is entangled by the water flow, the constituent fibers are entangled by the water flow (water jet, hereinafter also referred to as WJ) over the entire surface of the fiber web including the fibers. The WJ treatment is carried out by placing the fiber web on a conveyance support and jetting a water flow onto one or both sides of the web. At this time, the constituent fibers are entangled, the web is integrated, and a nonwoven fabric is obtained. 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 example, from a nozzle in which orifices having a hole diameter of 0.05 to 0.5 mm are provided at intervals of 0.2 to 1.5 mm, a water flow with a water pressure of 1 to 20 MPa is applied 1 to 4 times from the front and back sides of the fiber web. It is good to inject one by one. More preferably, the water pressure is 1 to 10 MPa. 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, and the degree of freedom of the fibers decreases, the texture becomes hard, or the texture of the nonwoven fabric may deteriorate. Thereby, the part (part other than the next second entangled part) where the constituent fibers are entangled is defined as the first entangled part. In addition, as long as this 1st entangled part is a range with the effect of this invention, you may perform operation of heat-bonding constituent fibers by heat processing.

  Further, the constituent fibers at predetermined positions of the nonwoven fabric are hydroentangled to form a second entangled portion. The second entangled portion is preferably entangled by WJ.

The second entangled portion has a regular pattern. 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, and a plain pattern. Specifically, a dot (circle, ellipse, triangle, polygon, etc.) pattern, a herringbone pattern, a checkered pattern, a lattice pattern, a zigzag pattern, a zigzag pattern, etc. are mentioned. The pattern of the second entangled part is preferably different from the pattern of the first entangled part. In addition, when the second entangled portion and the first entangled portion have the same pattern, a difference in thickness, that is, an unevenness difference, for example, when the second entangled portion is a concave portion, the first entangled portion is a convex portion. When the second entangled part is a convex part, two types of entangled parts that can be clearly distinguished by forming the first entangled part as a concave part can be formed, thereby improving the wiping property and easily taking in large dust. . When thickness unevenness difference is applied between the second entangled portion and the first entangled portion, the thickness difference (unevenness difference) is preferably 0.10 to 3.00 mm, more preferably 0.20 to 2.00 mm. Preferably, it is 0.30-1.00 mm. The thickness ratio (roughness ratio) is preferably 1.03 to 2.00, more preferably 1.05 to 1.70, and even more preferably 1.10 to 1.50. . In addition, two types of entangled portions that are clearly distinguished by forming a difference in density between the second entangled portion and the first entangled portion can be formed, thereby improving the wiping property and easily capturing large dust. When attaching a difference in density in the second intertwined portions and the first entangled portion, it is preferable that the difference in density is 0.005~0.15g / cm ^3, a 0.008~0.12g / cm ³ Is more preferable, and it is still more preferable that it is 0.010-0.10 g / cm < ³ >. The density ratio is preferably 1.05 to 3.00, more preferably 1.10 to 2.00, and even more preferably 1.15 to 1.50.

  The first entangled portion preferably has a regular pattern similar to the second entangled portion, and is different from the pattern of the second entangled portion. It is preferable that the first entangled portion is a regular pattern different from the pattern of the second entangled portion because a plurality of various functions and effects described later that the regular pattern has can be obtained.

  Each regular pattern has various functions and effects. For example, a dot pattern or the like in which openings are formed at a predetermined interval contributes to improving the scraping property, and brings an effect of making it difficult to stick to the skin because the contact area becomes small when contacting with the skin. . 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. Moreover, since the part where the density of the fiber is originally relatively high and the part where the fiber density is low runs diagonally, the serpentine pattern is combined with the meandering of the entangled part that forms the herringbone pattern, so that the wiping property is further improved. Get better. A plain pattern is preferable because, for example, when used as a wiping material, streaks due to dirt remaining when the dirt is scraped off can be wiped off cleanly. Therefore, if a plurality of types of patterns are applied, a nonwoven fabric having a plurality of functions can be provided.

  As a method for forming such a regular pattern, a support having such a regular pattern 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.

When the regular pattern is an aperture pattern, one area of the aperture (hereinafter, also simply referred to as an aperture area) is preferably 0.1 to 6.0 mm ² , and preferably 0.3 to 5 More preferably, it is 5 mm ² . Further, the distance between the centers of the apertures closest to each other (hereinafter also simply referred to as the aperture distance) is preferably 1.0 to 3.0 mm, and preferably 1.5 to 3.0 mm. Is more preferable. If it does in this way, the nonwoven fabric excellent in the scraping property of dirt will be obtained. In the present invention, the aperture area and the distance between the centers of the apertures can be measured using a stereomicroscope as will be described later.

  One of the preferable configurations of the nonwoven fabric of the present invention is a configuration in which one of the first entangled portion and the second entangled portion is a plain pattern and the other is an open pattern. For example, if the first entangled portion is a plain pattern and the second entangled portion is an open pattern, this configuration scrapes dirt off by the second entangled portion and scrapes off at the second entangled portion. The first entangled portion can be wiped off so that the unstained dirt does not become a streak. The non-woven fabric with a plain pattern on the entire surface is inferior in scraping performance, and the non-woven fabric with an open pattern on the entire surface is excellent for scraping off dirt, but the scraped dirt cannot be collected and streaks due to the dirt remain. . In addition, in the non-woven fabric of the stripe pattern in which the plain pattern portion and the aperture pattern portion are arranged in a straight line, the wiping property in the direction crossing the longitudinal direction of the stripe is good, but in the longitudinal direction of the stripe and the direction of 45 degrees obliquely In some cases, wiping lines due to dirt may remain. However, this configuration in which the first entangled portion and the second entangled portion meander in one direction of the nonwoven fabric is preferable because wiping lines due to dirt do not remain in any direction.

  The first interlaced portion and the second interlaced portion are separated from each other and exist in a plurality of rows. Thereby, since it has at least two patterns having different functions and effects, a non-woven fabric having high design properties is obtained compared to a conventional non-woven fabric having only one pattern, and also when used as a wiping material, Has better wiping properties.

  In the nonwoven fabric of the present invention, the first entangled portion and / or the second entangled portion meander along one direction of the nonwoven fabric while maintaining an interval of 2 mm or more in width. Further, in the nonwoven fabric of the present invention, it is preferable that the second entangled portion meanders along one direction of the nonwoven fabric while maintaining an interval of 2 mm or more in width, and the first entangled portion and the second entangled portion are 2 mm or more in width. It is more preferable to meander along one direction of the nonwoven fabric while maintaining the interval. In addition, the width | variety of a 1st entangled part and the width | variety of a 2nd entangled part point out the length in the direction orthogonal to one direction of a nonwoven fabric. Further, the first entangled portion and / or the second entangled portion may not be continuous and may be interrupted in the middle. This also applies to a third entangled portion described later, and the third entangled portion may not be continuous and may be interrupted in the middle. When using a nonwoven fabric as a wiping material or the like, the preferred range of the width of the first entangled portion is 3 to 200 mm, more preferred range is 3 to 100 mm, even more preferred range is 3 to 50 mm, and particularly preferred range is 5 to 30 mm. Moreover, the preferable range of the width | variety of a 2nd entanglement part is 3-200 mm, The more preferable range is 3-100 mm, The still more preferable range is 3-50 mm, The especially preferable range is 5-30 mm. Thereby, even if it wipes in any direction of length, breadth, and slanting, the outstanding wiping property is shown, and the nonwoven fabric and wiping material with high wiping performance can be provided. Moreover, the 1st entangled part and / or the 2nd entangled part meander along one direction of a nonwoven fabric in this way, and the 1st entangled part and / or 2nd entangled part follow one direction of a nonwoven fabric. A stronger nonwoven fabric can be obtained as compared with a nonwoven fabric existing in a straight line. In particular, the non-woven fabric of the present invention has a higher 10% elongation stress in one direction along which the meanders are aligned. When the first entangled portion is a plain pattern, the width of the first entangled portion is preferably 2 to 10 mm. If the width of the plain portion is too large, the scraping ability of dirt is deteriorated, and the wiping performance as a nonwoven fabric may be deteriorated. Moreover, when the 1st entangled part is a plain pattern, the value of the ratio of the width of the 1st entangled part and the width of the 2nd entangled part in the nonwoven fabric (first entangled part / second entangled part) is 0.1. It is preferable that it is-4, It is more preferable that it is 0.3-3, It is further more preferable that it is 0.5-2. If the value of the ratio of the width of the first entangled portion and the width of the second entangled portion is less than 0.1, a wiping line may remain, and if it exceeds 4, the scraping property of dirt is poor. And the wiping property may deteriorate.

  In addition, meandering refers to the case where the entangled portions such as the first entangled portion and the second entangled portion do not exist in a straight line along one direction of the nonwoven fabric but exist in a wavy shape along one direction of the nonwoven fabric. Point to. The wavy shape refers to, for example, a shape such as a sine wave, a triangular wave, a rectangular wave, a sawtooth wave, or a combination thereof. In particular, the meandering shape is preferably a curved shape at the meandering turn point, such as a sine wave.

  One direction in the nonwoven fabric of the present invention is the longitudinal direction of the first entangled portion and the second entangled portion, and as long as the effect of the present invention is ensured, the machine direction (MD direction) and the width direction (CD direction). It may be parallel to any of the above, but is preferably parallel to the MD direction. 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 may include a third entangled portion in addition to the first entangled portion and the second entangled portion. The third entangled portion may be formed at the same time as the second entangled portion is formed after forming the first entangled portion, or may be formed after forming the second entangled portion. The third entangled portion may be formed so as to intersect with a part of the second entangled portion, or may be formed between adjacent second entangled portions (that is, inside the first entangled portion). , And may be formed inside the second entangled portion. The third entangled portion may meander along one direction of the nonwoven fabric, meander along a direction different from one direction of the nonwoven fabric, or exist in a straight line along one direction of the nonwoven fabric. Alternatively, it may exist in a straight line along a direction different from one direction of the nonwoven fabric, but preferably meanders along one direction of the nonwoven fabric. Although the nonwoven fabric in case the 3rd entangled part is included in FIG. 15 is illustrated, as shown in FIG. 15, the 3rd entangled part is formed inside the 1st entangled part, and one of the 2nd entangled part. It is formed so as to cross the part. What is necessary is just to measure the width | variety of the 1st entanglement part in the case of including a 3rd entanglement part, and the width | variety which assumed the case where the 3rd entanglement part is not included. The width of the third entangled portion is preferably 2 mm or more, more preferably 3 to 50 mm, and even more preferably 5 to 30 mm.

  The width of the first interlaced part and the width of the second interlaced part do not have 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. Further, in each of the second interlaced portions, the width does not have to be constant. As shown in FIG. 14A, the width X at the meander folding point (hereinafter also simply referred to as the width X) and the others. It is preferable that the width Y of the portion (hereinafter also simply referred to as the width Y) is different, and it is more preferable that the width X at the meander folding point is smaller than the width Y of the other portion. Here, “width Y” means a maximum value width in a direction parallel to the width X in a portion other than the folding point as shown in FIG. 14, and the portion other than the folding point is in one meandering. The part between a certain turn-back point and the next turn-back point. On the other hand, in the first interlaced portion, the width X at the meander folding point is preferably different from the width Y at the other portion, and the width X at the meander folding point is larger than the width Y at the other portion. preferable.

  In each 2nd entangled part and / or 1st entangled part, it has a 2nd entangled part and a 1st entangled part in all directions, such as a direction orthogonal to a longitudinal direction and a longitudinal direction of a nonwoven fabric, by having a different width. A function and an effect will be mixed and multi-functionalization in the nonwoven fabric surface can be realized. In each of the second entangled portions and / or the first entangled portions, the nonwoven fabric having different widths injects a pressurized water flow, which will be described later, onto the nonwoven fabric through a perforated member having a predetermined shape. It can be obtained by a method of forming the perforated member by vibrating. Further, in the second entangled portion, the width Y of the other portion is larger than the width X of the turning point, so that the effect of the regular pattern of the second entangled portion can be further exhibited. Since the width X is larger than the width Y, the effect of the regular pattern of the first entangled portion can be further exhibited. Further, when the constituent fibers of the second entangled portion are entangled more strongly than the constituent fibers of the first entangled portion, the width Y of the other portion is larger than the width X of the turning point of the second entangled portion. Therefore, the strength of the non-woven fabric becomes stronger at the portion corresponding to the width Y. For example, when the regular pattern of the second entangled part is an open pattern and the regular pattern of the first entangled part is a plain pattern, the dirt is scraped off by the open pattern at a portion other than the meander folding point. A non-woven fabric is obtained that has higher properties and that has higher wiping properties of the wipes of the dirt that has been scraped off at the meandering point.

  In the above, the difference | X−Y | between the width X and the width Y in the second entangled portion is preferably 0.2 to 7.0 mm, more preferably 0.5 to 6.0 mm. More preferably, it is 1.0-5.0 mm, Most preferably, it is 1.3-5.0 mm. Further, the ratio of the width Y to the width X (Y / X) is preferably 1.05 or more, more preferably 1.20 or more, and further preferably 1.50 or more. Similarly, the difference | X−Y | between the width X and the width Y in the first entangled portion is preferably 0.2 to 7.0 mm, more preferably 0.5 to 6.0 mm. More preferably, it is 1.0-5.0 mm, Most preferably, it is 1.3-5.0 mm. Further, the ratio (X / Y) of the width X to the width Y is preferably 1.05 or more, more preferably 1.20 or more, and further preferably 1.50 or more.

  In the nonwoven fabric of the present invention, it is only necessary that a part of the first entangled portion or the second entangled portion of the nonwoven fabric satisfies the above-mentioned range related to the difference between the width Y and the width X and the ratio between the width Y and the width X. And in the nonwoven fabric of this invention, it is preferable that the part which satisfy | fills said range regarding the width | variety Y and the width | variety X is 50% or more of the number of the meandering folding points of the whole nonwoven fabric, More preferably, it is 70% or more. is there.

  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, the repeating unit that sequentially 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 size and type of dirt that is easily captured is different depending on the width of the first entangled portion or the second entangled portion. Alternatively, it is preferable to have the second entangled portion because various types of dirt can be wiped off.

  In addition, in the conventional wiping material in which the entire surface is plain or a pattern such as a large number of apertures is formed on almost the entire surface, dirt is formed on the edge of the surface of the wiping material that contacts the surface to be wiped such as the body or floor. Since it is wiped intensively, the central portion of the surface of the wiping material that contacts the surface to be wiped cannot be effectively used 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 wiping performance at the center of the surface in contact with the surface to be wiped is higher than that of a conventional non-woven fabric wiping material.

  As described above, when the width of the first entangled portion or the second entangled portion is different, the size and type of dirt that is easily captured is different. Therefore, of the wiping material, the dirt that has not been captured by the first entangled part or the second entangled part located at the edge of the surface in contact with the surface to be wiped such as the body or floor enters inside the edge, Captured by the first entangled part or the second entangled part with different widths located inside the first entangled part or the second entangled part located at the edge, and also captured by the first entangled part or the second entangled part. Dirt that has not been captured is captured by the first entangled portion or the second entangled portion having different widths located further inside. 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 Alternatively, the wiping performance is better than the nonwoven fabric having the same width of the second entangled portion.

  In addition, the nonwoven fabric of the present invention does not have to satisfy the above range for the widths of all the first entangled portions or the second entangled portions contained in the nonwoven fabric, so long as the effects of the present invention are not impaired. There may be a first interlaced portion or a second interlaced portion that is not included in the width. Among the first entangled part or the second entangled part included in the nonwoven fabric of the present invention, when the number of rows of the first entangled part or the second entangled part satisfying the above range is 50% or more in the whole nonwoven fabric, As a wiping material, since the wiping property more excellent is shown, it is preferable. It is more preferable that 70% or more is included.

  The meandering length of the second entangled portion is preferably 5 mm or more per cycle (that is, the wavelength). As shown in FIG. 2, the length of the meandering of the second entangled portion per cycle is a direction 32 orthogonal to the one direction 31 in which the second entangled portion 42 meanders (the orthogonal direction). The point e is the point at which the meandering direction (positive direction) changes from the positive direction to 180 ° direction (negative direction), and then the meandering direction changes from the positive direction to the negative direction. When the changing point is a point f (not a point changing from a negative direction to a positive direction), one direction of a straight line in the orthogonal direction 32 including the point e and a straight line in the orthogonal direction 32 including the point f The length I at 31 is indicated. When the meandering portion where the meandering direction changes from the positive direction to the negative direction is a straight line parallel to one direction 31 (for example, meandering like a rectangular wave), the midpoint of the straight line is determined from the positive direction. The point changes in the negative direction. If the usage pattern is as large as a wiping material, the upper limit of the wavelength is preferably 200 mm. The wavelength is more preferably a period of 10 to 150 mm, and further preferably 30 to 100 mm. Thereby, the setting to the wiping apparatus becomes easy. In addition, the meandering of the second entangled portion preferably has an amplitude of 1 mm or more. As shown in FIG. 2, the amplitude is a point g where the meandering described above changes from a positive direction to a negative direction, and then the meandering changes from a negative direction to a positive direction. Is a length J in the orthogonal direction 32 between a straight line in one direction 31 including the point g and a straight line in one direction 31 including the point h. Here, the point g and the point h are points located at the midpoint of the width of the second entangled portion. If the usage pattern is as large as a wiping material, the upper limit of the amplitude is preferably 200 mm. The amplitude is more preferably 2 to 150 mm, still more preferably 5 to 100 mm, and particularly preferably 10 to 50 mm. Most preferably, the amplitude is 15 to 30 mm because the wiping property is improved. The meandering of the second interlaced part may be different in length per period, and may have different amplitudes like a damped wave, and these meanders are repeated regularly. However, a preferred meandering configuration is that the meandering length per cycle is the same and the amplitude is the same, that is, the same pattern is repeated. The value (wavelength / amplitude) of the ratio (wavelength / amplitude) of the length (wavelength) and amplitude per cycle of meandering is preferably 1-15. A more preferable range is 1.5 to 12, and a further preferable range is 2 to 8. When the value of the ratio between the wavelength and the amplitude is less than 1, the second entangled portion is close to a non-woven fabric that exists linearly in the orthogonal direction, and the wiping property may be inferior. Moreover, if the value of the ratio between the wavelength and the amplitude exceeds 15, the second entangled portion may be close to a nonwoven fabric that exists linearly in one direction of the nonwoven fabric, and the wiping property may be inferior. 2 shows an example in which the meandering phases of the adjacent second interlaced parts or the first interlaced parts are similar, but as shown in FIG. 14B, the adjacent second interlaced parts or the first The meandering phase of one interlaced part may be shifted.

  The WJ process for forming the meandering second entangled portion in the present invention is a method of using a support capable of forming a meandering pattern as a support, and an orifice group comprising one or more orifices is provided at a predetermined interval. A method in which the nozzles are formed by vibrating the nozzles, a method in which the nozzles are provided with orifice groups at the predetermined intervals, the nozzles are not vibrated and the conveying support is vibrated, and pressurized water. For example, a method may be used in which a flow is jetted onto a non-woven fabric through a perforated member having a predetermined shape, and the perforated member is vibrated and formed.

  In the method of using a support capable of forming a meandering pattern as the support, it is preferable to use a support in which the width of the first entangled portion or the second entangled portion is wide. For example, it is preferable to use a support having a width of the first entangled portion or the second entangled portion of 2 mm or more, more preferably a support having 3 to 50 mm, and further preferably 5 to 30 mm. The hydroentanglement treatment conditions in this method can be appropriately set according to the basis weight of the fiber web, the speed of the transport support, and the like. For example, from a nozzle in which orifices having a hole diameter of 0.05 to 0.5 mm are provided at intervals of 0.2 to 1.5 mm, a water flow with a water pressure of 1 to 20 MPa is applied 1 to 4 times from the front and back sides of the fiber web. It is good to inject one by one. More preferably, the water pressure is 1 to 10 MPa. 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, and the degree of freedom of the fibers decreases, the texture becomes hard, or the texture of the nonwoven fabric may deteriorate.

  In a method in which a nozzle having a group of one or more orifices provided at a predetermined interval is used and the nozzle is vibrated, the second entangled portion is formed by a water flow by the orifice group and adjacent to each other. The interval between the orifice groups is preferably 2 mm or more, more preferably 3 to 50 mm, and even more preferably 5 to 30 mm. Moreover, it is preferable that the width | variety of one orifice group is 2 mm or more, 3-50 mm is more preferable, and 5-30 mm is further more preferable. The number of orifices included in one orifice group is preferably 2 or more. When the number of orifices is 2 or more, the ratio of the regular pattern of the second entangled portion to a simple nozzle line can be reduced. 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. The water entanglement treatment condition is preferably such that a water flow having a water pressure of 1 to 20 MPa is ejected from the nozzles 1 to 4 times from the front and back sides of the fiber web. More preferably, the water pressure is 1 to 10 MPa. 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, and the degree of freedom of the fibers decreases, the texture becomes hard, or the texture of the nonwoven fabric may deteriorate.

  In a method in which a nozzle having orifice groups provided at a predetermined interval is used, and the nozzle is not vibrated and the conveying support is vibrated, the orifice group including the one or more orifices is provided at a predetermined interval. It is preferable to use a nozzle similar to the method of forming the nozzle by vibrating the nozzle. Moreover, what is necessary is just to carry out on the same conditions also about hydroentanglement process conditions.

  And, according to the method of forming the second interlaced portion meandering by vibrating the perforated member, compared with the method of using a support capable of forming a meandering pattern, the vibration speed and width of the perforated member, the conveyance By changing the conveyance speed of the support and the like, the length and amplitude of the meandering per cycle can be freely set, which is preferable. Moreover, in the method of forming using the support body which can form a meandering pattern, since a water flow is applied to the whole surface of a nonwoven fabric, it is difficult to obtain a difference in thickness and density between the first entangled portion and the second entangled portion. Also, according to the method of vibrating the perforated member, the perforated member is lighter in weight than the nozzle and having the same cost as the method of vibrating the nozzle having the orifice group provided at a predetermined interval. Then, it can be vibrated smoothly, especially at the turning point of vibration, and for example, when forming a meandering pattern having a sine wave-like curve at the turning point as a meandering pattern, nozzle vibration Then, the movement at the turning point of the amplitude cannot be smoothly performed, and the curve at the turning point of the meandering pattern is close to a straight line. However, the vibration of the perforated member can form a meandering pattern closer to the curve, which is preferable. Further, the method of vibrating the perforated member is preferable because it can be formed without generating wrinkles in the nonwoven fabric as compared with the method of vibrating the conveying support. In the method of forming the second entangled portion meandering by vibrating the perforated member, it is possible to use a nozzle in which orifice groups including the one or more orifices are provided at a predetermined interval.

  In this method, a perforated member having a plurality of holes is installed between a nozzle for injecting a pressurized water flow and a first entangled fiber assembly, and the pressurized water flow is transmitted through the perforated member to the fiber assembly. The second entangled part having a regular pattern is formed by rearranging a part of the constituent fibers of the fiber assembly by a pressurized water flow that is sprayed onto the perforated member and passes through the hole part of the perforated member. Since the plurality of holes of the perforated member are present at a predetermined interval, the pressurized water flow does not pass through the perforated member in the portion where there is no hole, so that the fiber assembly in that portion remains in the first entangled state. It becomes the 1st entanglement part. In this way, the first entangled portion and the second entangled portion are formed so as to exist in a plurality of rows separated from each other. At this time, the second entangled portion and / or the first entangled portion can be formed to meander by vibrating the perforated member and moving the fiber assembly.

The perforated member may be any member as long as it has a plurality of holes. For example, the material may be made of synthetic resin or metal, and the shape may be a plate shape or a roll shape. What is necessary is just to select suitably according to the manufacturing apparatus of this. The weight of the perforated member is preferably 20 kg or less, more preferably 1 to 15 kg. The weight per unit area of the perforated member is preferably at most 5 g / cm ² or less, more preferably 0.1~3.5g / cm ^2.

  The plurality of holes included in the perforated member preferably have a width in the direction of vibrating the perforated member of 2 mm or more, more preferably 3 to 50 mm, and still more preferably 5 to 30 mm. . Moreover, it is preferable that the space | interval of the adjacent hole contained in a perforated member is 2 mm or more, a more preferable range is 3-50 mm, and a more preferable range is 5-30 mm. The shape of the hole may be any shape, for example, a circle, a semicircle, an ellipse, a polygon such as a triangle or a quadrangle, a star polygon, a cross, a slit shape such as a straight line or a curve, and the like are preferable. .

  What is necessary is just to select suitably the vibration direction of a perforated member, such as MD direction, CD direction, diagonal direction. In addition, the diagonal direction said here means that an angle exists in the range of more than 0 degree | times and less than 90 degree | times from MD or CD direction along the surface direction of a nonwoven fabric. Considering the simplicity in production, the vibration direction is preferably the CD direction or the direction in which the angle is in the range of more than 0 degree and 45 degrees or less from the CD direction. The term vibration refers to reciprocating a perforated member along a certain direction, including reciprocating along a straight line, reciprocating along an elliptical orbit having a certain direction as a major axis, and the like. . In addition, the vibration direction of the perforated member and the longitudinal direction of the perforated member may or may not be parallel. The angle between the longitudinal direction of the perforated member and the vibration direction is changed during vibration. May be.

  The vibration speed of the perforated member can be increased to about 100 m / min. On the other hand, when the nozzle is vibrated, the vibration speed can be increased only to about 10 m / min if the equipment has the same cost. And by increasing the vibration speed of the perforated member, the difference between the width X at the turning point of the entangled part such as the first entangled part and the second entangled part and the width Y at the other part can be increased. .

  The distance between the perforated member and the nozzle is preferably 1 mm or more, the distance between the perforated member and the orifice is preferably 30 mm or less, and the distance between the perforated member and the fiber assembly is 5 to 5 mm. 50 mm is preferred. If the distance between the perforated member and the nozzle is less than 1 mm, the perforated member and the nozzle may come into contact with each other and one or both may be damaged. If the distance between the perforated member and the fiber assembly is less than 5 mm, the perforated member and the fiber assembly may come into contact with each other and damage the fiber assembly. If the distance between the perforated member and the orifice exceeds 30 mm, or if the distance between the perforated member and the fiber assembly exceeds 50 mm, the energy of the water flow may decrease and the confounding property may be insufficient.

  The hydroentanglement treatment conditions in this method can be appropriately set according to the basis weight of the fiber web, the speed of the transport support, and the like. For example, from a nozzle in which orifices having a hole diameter of 0.05 to 0.5 mm are provided at intervals of 0.2 to 1.5 mm, a water flow with a water pressure of 1 to 20 MPa is applied 1 to 4 times from the front and back sides of the fiber web. It is good to inject one by one. More preferably, the water pressure is 1 to 10 MPa. 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, and the degree of freedom of the fibers decreases, the texture becomes hard, or the texture of the nonwoven fabric may deteriorate.

  The nonwoven fabric of the present invention is suitably used as a wiping material, but other uses include water-absorbing articles (particularly, surface sheets and second sheets), gauze, face masks, filters, packaging materials, mats, cushion materials, and tables. It is suitable for various uses such as cloth, carpet backing and wallpaper. In applications such as gauze, packaging materials, cushion materials, wallpaper, etc., the excellent design properties of the nonwoven fabric of the present invention can be exhibited. In applications such as tablecloths, mats, and carpet backings, the first entangled portion and the second entangled portion meander along one direction of the nonwoven fabric while maintaining a predetermined distance, thereby providing excellent design properties. In addition to the above, it is possible to impart antiskid properties to the nonwoven fabric and meandering, and therefore, it is possible to impart antiskid properties in all directions. In applications such as a water-absorbent article, the first entangled portion and the second entangled portion maintain a predetermined distance and meander along one direction of the nonwoven fabric, thereby suppressing the fluidity of the liquid on the nonwoven fabric surface. Thereby preventing liquid leakage. In applications such as a face mask and a filter, a plurality of functions can be provided by providing separate functions for the first entangled portion and the second entangled portion. For example, in a filter, one side has a function with high filtration accuracy and the other side has a function with high filtration life.

  Next, it demonstrates using drawing. FIG. 1A is a cross-sectional explanatory view of a nonwoven fabric manufacturing process in one embodiment of the present invention, and FIG. 1B is a perspective view thereof. This hydroentanglement processing apparatus 10 arrange | positions the perforated member 2 on the nonwoven fabric 3 by which the 1st entanglement process was mounted mounted on the conveyance support body 4, and the nonwoven fabric 3 by which the 1st entanglement process was carried out is a high-pressure water flow ( Water jet: WJ) 1 is further entangled. At this time, as shown in FIG. 1B, the perforated member 2 is moved in the width direction (CD direction) 8a, 8b of the nonwoven fabric. The water flow WJ1a ejected from the water flow nozzle 7 passes through the hole 2a of the perforated member 2 and collides with the nonwoven fabric 3 to form a second entangled portion. Since the portion of the water flow 1b that does not pass through the perforated member 2 does not reach the nonwoven fabric 3, it remains as the first entangled portion. 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.

3-6, FIG. 9A, FIG. 10A, FIG. 11A, and FIG. 12A are top views of the nonwoven fabric in the Example of this invention. The nonwoven fabric 11 of FIG. 3 consists of the 1st entangled part 12 and the 2nd entangled part 13, and maintains the space | interval of the width 2mm or more of the 1st entangled part 1, and the width 2mm or more of the 2nd entangled part 2, and the machine direction of a nonwoven fabric Serpentine along (MD direction). The nonwoven fabric 14 of FIG. 4 is the same as that of FIG. 3 except that the first entangled portion 15 and the second entangled portion 16 are formed. The nonwoven fabric 17 of FIG. 5 is the same as that of FIG. 3 except that the first entangled portions 18a and 18b and the second entangled portions 19a and 19b are formed. The nonwoven fabric 20 of FIG. 6 is the same as FIG. 3 except that the first entangled portions 21a and 21b and the second entangled portions 22a and 22b having different widths are formed. The nonwoven fabric 50 of FIG. 9A has plain interlaced first interlaced portions 51a, 51b and perforated pattern second interlaced portions 52a, 52b. The first interlaced portions 51a, 51b and the second interlaced portions 52a, 52b are: Each meanders along the machine direction (MD direction) of the nonwoven fabric while maintaining intervals of 3 mm, 3 mm, 3 mm, and 20 mm. In the hole pattern of FIG. 9A, one hole area is 1.05 mm ² and the distance between the centers of the holes closest to each other is 1.5 mm. The nonwoven fabric 70 shown in FIG. 10A has plain pattern first interlaced portions 71a and 71b and aperture pattern second interlaced portions 72a and 72b. In the aperture pattern, one aperture area is 4.8 mm ² . 9A is the same as FIG. 9A except that the distance between the centers of the apertures closest to is 2.3 mm. The nonwoven fabric 90 of FIG. 11A has plain interlaced first interlaced portions 91a, 91b and second interlaced portions 92a, 92b of a herringbone pattern. It is meandering along the machine direction (MD direction) of the nonwoven fabric while maintaining intervals of 3 mm width, 3 mm width, 3 mm width and 20 mm width. The nonwoven fabric 110 of FIG. 12A has a plain pattern first interlaced part 111, an aperture pattern second interlaced part 112, and a plain pattern third interlaced part 113, and the first interlaced part 111 and the second interlaced part 112 are , Meandering along the machine direction (MD direction) of the nonwoven fabric while maintaining an interval of 3 mm width and 3 mm width, respectively.

  7, 8, 9B, 10B, 11B, 12B, and 13 are plan views of the nonwoven fabric of the comparative example. As for the nonwoven fabric 23 of FIG. 7, the 1st entanglement part 24 and the 2nd entanglement part 25 are all formed in the straight line. This non-woven fabric has unwiped properties because the wiping lines remain. The nonwoven fabric 26 in FIG. 8 is a nonwoven fabric in which WJ is applied to the entire surface as the second entanglement process to form openings. This nonwoven fabric has wiping lines remaining in three directions, and the wiping property is not preferable. The nonwoven fabric 60 of FIG. 9B has first entangled portions 61a and 61b having a plain pattern and second entangled portions 62a and 62b having an aperture pattern, and the first entangled portions 61a and 61b and the second entangled portions 62a and 62b are All are similar to FIG. 9A except that they are formed in a straight line. The nonwoven fabric 80 of FIG. 10B has plain interlaced first interlaced portions 81a, 81b and perforated second interlaced portions 82a, 82b, and the first interlaced portions 81a, 81b and second interlaced portions 82a, 82b All are similar to FIG. 10A except that they are formed in a straight line. The nonwoven fabric 100 in FIG. 11B has plain interlaced first interlaced portions 101a and 101b and herringbone second interlaced portions 102a and 102b, and the first interlaced portions 101a and 101b and the second interlaced portions 102a and 102b are Is the same as FIG. 11A except that it is formed in a straight line. The nonwoven fabric 120 of FIG. 12B has a plain pattern first interlaced part 121, an aperture pattern second interlaced part 122, and a plain pattern third interlaced part 123, and the first interlaced part 121 and the second interlaced part 122 These are the same as in FIG. 12A except that they are formed in a straight line. The nonwoven fabric 130 of FIG. 13 is a nonwoven fabric in which WJ is applied to the entire surface as a second entanglement process to form a herringbone pattern.

  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) non-woven fabric of the entire thickness of the nonwoven fabric thickness measuring instrument (trade name "THICKNESS GAUGE", model: CR-60A, Daiei Kagaku Seiki Seisakusho Co., Ltd.) was used, the sample 1cm ² per 3g according to JIS L 1096 It measured in the state which added the load.
(2) Tensile strength 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 ″, manufactured by Orientec Co., Ltd.), 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 breaking strength and breaking elongation, respectively.
(3) Stress at 10% elongation Load value at 10% elongation at break strength measurement, that is, load value when stretched by 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.
(4) Basis weight According to JIS L 1096, test pieces were collected and weighed to determine the mass per 1 m ² (g / m ² ).
(5) Density Density was calculated from the thickness and basis weight.
(6) Opening area Under an environment where the temperature and humidity are kept constant, the surface of the nonwoven fabric is magnified and observed (magnification 50 times) using a stereomicroscope (trade name “SZX12”, manufactured by Olympus Corporation). The obtained image was printed on plain paper, and portions corresponding to arbitrary five openings were cut out from the plain paper. The aperture area was calculated from the basis weight (mass per unit area) of the cut-out plain paper, and the average value of these values was divided by the observed magnification to obtain the aperture area.
(7) Distance between adjacent apertures Using a stereomicroscope (trade name “SZX12”, manufactured by Olympus Corporation), the surface of the nonwoven fabric is magnified (magnification 50 times), and the apertures adjacent to each other with a ruler from the obtained image The distance between adjacent holes was calculated by measuring the distance between 10 points and dividing the average value by the observed magnification. However, the distance between the centers of adjacent openings was defined as the distance between the openings.
(8) Dirt wiping test A 30 cm square acrylic resin plate was attached to an apparatus having an inclination angle of 40 °. A lipstick (product name “DIOL316”) was applied in the center of the acrylic resin plate 3 mm in length and 60 mm in width. The nonwoven fabric sample was cut into a 10 cm square and impregnated with distilled water to 250%. Next, the nonwoven fabric sample was wound around a 1040 g metal flat plate (length 60 mm, width 170 mm) and fixed with an adhesive tape. The nonwoven fabric sample attached to the metal flat plate was slid down from the acrylic resin plate, and the lipstick was wiped off. The number of times until the lipstick disappeared in the direction of MD, CD and oblique (45 ° angle from MD or CD) of the nonwoven fabric was measured.

Example 1
Solvent-spun rayon fiber (fineness 1.7 dtex, fiber length 40 mm, trade name “Lyocell”, manufactured by Lenzing) 80% by mass, first component polyethylene terephthalate (melting point 253 ° C.), second component high density polyethylene 10% by mass of a split type composite fiber having a cross-sectional shape radially divided into 8 (melting point: 132 ° C.) (fineness: 2.2 dtex, fiber length: 51 mm, trade name “DFS (SH)”, manufactured by Daiwabo Polytech Co., Ltd.) And a sheath-core composite fiber (fineness of 2.2 dtex, having a sheath component of polyethylene (melting point: 132 ° C.) and a core component of polypropylene (melting point: 160 ° C., trade name “NBF (H)”, manufactured by Daiwabo Polytech Co., Ltd.) fiber length 51 mm) and cotton mixing a 10 wt%, and the card with a roller-type parallel card, a basis weight of 55 g / m ² the card web It was manufactured.

  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 2.0 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. A first entangled fiber web was obtained as described above. The first entangled net is 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, and the pattern of the first entangled portion is a plain pattern. It was made to become.

  Next, the second entanglement process was performed. As shown in FIGS. 1A and 1B, the acrylic resin holed member 2 is arranged on the nonwoven fabric 3 subjected to the first entanglement treatment, and the water flow WJ1a is passed through the hole 2a of the holed member 2 so that the second entangled part is formed. Formed. At this time, the perforated member 2 was vibrated in the width direction (CD direction) of the nonwoven fabric. The nonwoven fabric after the WJ treatment was dried and wound up. As the drying temperature, the nonwoven fabric of Example 1 was obtained by drying and heat treatment in a dryer having an atmospheric temperature of 140 ° C.

The traveling speed during the second entanglement was 4 m / min, and the water pressure was 4.0 MPa. The perforated member is an acrylic plate having a MD direction length of 14.5 mm, a CD direction length of 70 mm, and a thickness of 5 mm. The MD direction width is 3 mm and the CD direction width is 3 mm. Using a perforated member having a square hole with a size of 3 mm and an interval between adjacent holes of 3 mm, the distance between the nonwoven fabric and the perforated member is 15 mm, the distance between the nozzle and the perforated member is 1 mm, The distance between the surface of the fiber web and the orifice was 21 mm. The second interlacing net is 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 so that the regular pattern is an open pattern. did. The perforated member was vibrated within a width of 10 mm in the CD direction, and the vibration speed was 0.8 m / min. The obtained non-woven fabric is a corrugated stripe in which the meandering shown in FIG. 4 is present along the MD direction, and has a plain width of 3 mm, an opening width of 3 mm (one opening area of 1.05 mm ² , the opening closest to each other) The distance (1.5 mm between the centers) of the wavy stripes, the length (wavelength) per cycle of the wavy stripe meander was 100 mm, and the amplitude was 10 mm.

(Comparative Example 1)
A nonwoven fabric was produced in the same manner as in Example 1 except that the corrugated stripe was a straight stripe having a plain width of 3 mm and an opening width of 3 mm shown in FIG.

(Comparative Example 2)
A non-woven fabric was produced in the same manner as in Example 1 except that in the second entanglement treatment, the corrugated stripe was made into the entire surface opening shown in FIG.

(Comparative Example 3)
A nonwoven fabric was produced in the same manner as in Example 1 except that the second entanglement treatment was not performed.

(Example 2)
In the second entanglement process, the nonwoven fabric is the same as in Example 1 except that the perforated member has a vibration width of 20 mm in the CD direction, a vibration speed of 1.6 m / min, a wavy stripe of 100 mm, and an amplitude of 20 mm. Was made.

(Example 3)
A nonwoven fabric was produced in the same manner as in Example 1 except that the vibration speed of the perforated member was 1.1 m / min, the waveform stripe was set to a wavelength of 70 mm, and the amplitude was set to 10 mm in the second entanglement treatment.

Example 4
In the second entanglement process, as the holed member, the holed member used in Example 1 and the shape and size of the hole are the same, and the interval between adjacent holes is 3 mm, 20 mm is used alternately, A non-woven fabric was prepared in the same manner as in Example 1 except that the pattern was a pattern having an aperture width of 3 mm / a plain width of 3 mm / aperture width of 3 mm / a plain width of 20 mm as shown in FIG. .

(Example 5)
In the second entanglement process, a holed member having a size of 3 mm and a hole of 20 mm is present at an interval of 3 mm, the vibration width of the holed member is 20 mm in the CD direction, and the vibration speed is 1.14 m / Non-woven fabric in the same manner as in Example 1 except that the pattern is a pattern having a solid width of 3 mm / aperture width of 3 mm / a plain width of 3 mm / aperture width of 20 mm shown in FIG. 9A, and the wavy stripe has a wavelength of 140 mm and an amplitude of 20 mm. Was made. In the second entangled portion having an opening width of 3 mm, the width X is 2.3 mm, the width Y is 3.0 mm, the width difference | X−Y | is 0.7 mm, and the width ratio Y / X is 1.30. In the second entangled portion with the opening width of 20 mm, the width X is 18.9 mm, the width Y is 20.0 mm, the width difference | X−Y | is 1.1 mm, and the width ratio Y / X is 1. In the first entangled portion, the width X was 3.3 mm, the width Y was 2.2 mm, the width difference | XY | was 1.1 mm, and the width ratio X / Y was 1.50. . Here, the width is a width measured in the direction (CD direction) orthogonal to the direction along which the meanders are along (MD direction), and the same applies to the following.

(Example 6)
In the second entanglement process, as shown in FIG. 10A, one aperture area is 4.8 mm ² , the distance between the centers of the apertures closest to each other is 2.3 mm, and the second entanglement net is warped. A nonwoven fabric was prepared in the same manner as in Example 5 except that a plain weave net having a wire diameter of 1.2 mm, a weft wire diameter of 1.2 mm, a warp density of 12 / inch, and a weft density of 12 / inch was used. In the second entangled portion having an opening width of 3 mm, the width X is 3.0 mm, the width Y is 3.4 mm, the width difference | X−Y | is 0.4 mm, and the width ratio Y / X is 1.13. And the width X is 19.0 mm, the width Y is 20.4 mm, the width difference | X−Y | is 1.4 mm, and the width ratio Y / X is 1. In the first entangled portion, the width X was 3.6 mm, the width Y was 3.0 mm, the width difference | X−Y | was 0.6 mm, and the width ratio X / Y was 1.20. .

(Example 7)
In the second entanglement process, a 3/1 herringbone weave net having a warp wire diameter of 0.4 mm, a weft wire diameter of 0.8 mm, and a weaving density of 68/18 pieces / inch is used for the second entanglement net. A nonwoven fabric was prepared in the same manner as in Example 5 except that the pattern was a plain width 3 mm / cedar width 3 mm / plain width 3 mm / cedar width 20 mm shown in FIG. In the second entangled portion having a width of 3 mm, the width X is 2.0 mm, the width Y is 3.0 mm, the width difference | X−Y | is 1.0 mm, and the width ratio Y / X is 1.50. Yes, in the second entangled part with a width of 20 mm, the width X is 18.8 mm, the width Y is 20.6 mm, the width difference | X−Y | is 1.8 mm, and the width ratio Y / X is 1.10. In the first entangled portion, the width X was 3.6 mm, the width Y was 3.0 mm, the width difference | X−Y | was 0.6 mm, and the width ratio X / Y was 1.20.

(Comparative Example 4)
In the second entanglement process, the same procedure as in Example 1 was carried out except that the corrugated stripe was entirely opened (one opening area was 4.8 mm ² and the distance between the centers of the openings closest to each other was 2.3 mm). A nonwoven fabric was prepared.

(Comparative Example 5)
A nonwoven fabric was produced in the same manner as in Example 1 except that in the second entanglement treatment, the corrugated stripe was made entirely of cedar as shown in FIG.

(Comparative Example 6)
A nonwoven fabric was produced in the same manner as in Example 5 except that in the second entanglement treatment, the wavy stripe was a straight stripe as shown in FIG. 9B.

(Comparative Example 7)
A nonwoven fabric was produced in the same manner as in Example 6 except that in the second entanglement process, the wavy stripe was a straight stripe as shown in FIG. 10B.

(Comparative Example 8)
A nonwoven fabric was produced in the same manner as in Example 7 except that in the second entanglement treatment, the wavy stripe was a straight stripe as shown in FIG. 11B.

(Example 8)
In the second entanglement process, using the same net as the net used in the first entanglement process, the water flow through the perforated member becomes a concave part, and the other part becomes a convex part, and the vibration width of the perforated member Is set to 20 mm in the CD direction, the vibration speed is set to 3.2 m / min, and the difference between the thickness of the convex part and the concave part is 0.12 mm, and the pattern of the solid convex part width is 3 mm / the plain concave part width is 3 mm. A nonwoven fabric was produced in the same manner as in Example 1 except that the amplitude was 20 mm. In addition, the ratio of the thickness of the convex part and the concave part is 1.20, the difference in density between the convex part and the concave part is 0.018 g / cm ³ , and the ratio of density (large density / small density) is 1.20. Yes, in the second entangled part with a 3 mm recess width, the width X is 1.6 mm, the width Y is 3.0 mm, the width difference | X−Y | is 1.4 mm, and the width ratio Y / X is 1.88. Yes, in the first entangled portion with a 3 mm convex width, the width X is 4.6 mm, the width Y is 3.0 mm, the width difference | X−Y | is 1.6 mm, and the width ratio X / Y is 1.53. Met. Here, for the measurement of thickness and density, a sample of a predetermined area is prepared, and for the thickness, first, the convex part and the concave part are separated, and only the convex part or the concave part is collected, and the same method as the above-described measuring method. Measured with Next, for the basis weight, similarly, only the convex portions or the concave portions were collected, the weight was measured, and the weight value was obtained by multiplying the predetermined area by the ratio of the area of the convex portion or the concave portion. The density was calculated from the above thickness and basis weight.

Example 9
In the second entanglement process, the nozzle is a water feeder in which orifices having a hole diameter of 0.13 mm are provided at intervals of 0.6 mm, and a part of the plurality of orifices is blocked so that no water flow occurs. The closed part and the intact part are alternately arranged, and the closed part and the intact part are each 24 mm in width, the perforated member has a vibration width of 20 mm in the CD direction, and the vibration speed. Is set to 3.2 m / min, the pattern is a mixed pattern width of 24 mm / solid width of 24 mm as shown in FIG. 12A, and the wavy stripe in the mixed pattern is set to a wavelength of 50 mm and an amplitude of 20 mm. A non-woven fabric was produced in the same manner as in Example 1 except that the plain 24 mm was a straight stripe. Note that, in the second entangled portion having the opening width of 3 mm, the width X is 2.8 mm, in the first entangled portion, the width X is 3.0 mm, and the second entangled portion and the first entangled portion are folded back. Since most of the portions other than the points are hole patterns, the width Y was not measured.

(Comparative Example 9)
A nonwoven fabric was produced in the same manner as in Example 9 except that in the second entanglement treatment, the wavy stripe in the mixed pattern was changed to a straight stripe as shown in FIG. 12B.

  The physical properties of the obtained nonwoven fabrics of Examples and Comparative Examples and the results of the wiping test are summarized in Table 1 below.

  The nonwoven fabric of Example 1 was not affected by the wiping direction, showed good wiping properties, and no wiping lines due to dirt remained. On the other hand, the non-woven fabric having a hole pattern on the entire surface of Comparative Example 2 has good dirt scraping properties, but wiping lines due to dirt remained in all directions of MD, CD, and slant. Moreover, although the wiping streaks did not remain in the non-woven fabric having a plain pattern on the entire surface of Comparative Example 3, the scraping property was not sufficient and the wiping property was inferior to that of Example 1. In addition, the nonwoven fabric having the perforated pattern and the plain pattern of Comparative Example 1 and formed in a straight line has good scraping property, and there was no wiping streak in the CD and oblique directions, but in the MD direction. Streaks remained.

  Moreover, when paying attention to the stress at 10% elongation in the MD direction, the strength of the nonwoven fabric of Example 1 and Comparative Example 1 takes a value between Comparative Example 2 and Comparative Example 3, and Example 1 and Comparative Example 1 Then, the nonwoven fabric of Example 1 was stronger. That is, the nonwoven fabrics of Example 1 and Comparative Example 1 are the same in that they have the perforated pattern of Comparative Example 2 and the plain pattern of Comparative Example 3 at the same time, and have the functions at the same time. The non-woven fabric with meandering portion has a large stress at the time of 10% elongation in the MD direction as a non-woven fabric, which is advantageous in that it is less distorted during wiping and has less fiber loss. I understand that.

  Moreover, the nonwoven fabrics of Examples 2 and 3 show good wiping properties as compared with the nonwoven fabrics of Comparative Examples 1 to 3 as in Example 1, and the stress at 10% elongation in the MD direction is that of Comparative Example 1. It was larger than the nonwoven fabric. In addition, the nonwoven fabric of Example 4 was inferior in wiping performance as compared with the nonwoven fabrics of Examples 1 to 3, but the 10% elongation stress in the MD direction was larger than that of Comparative Example 1. there were. Considering the cause of poor wiping performance in the nonwoven fabric of Example 4, in the nonwoven fabric of Example 4, the width of the first entangled portion that is a plain pattern is larger than the width of the second entangled portion that is a hole pattern, This is thought to be due to the lack of scraping ability due to the aperture. Actually, in the nonwoven fabrics of Examples 1 to 3, the value of the ratio of the width of the first entangled portion and the width of the second entangled portion (first entangled portion / second entangled portion) is 1, whereas In the nonwoven fabric of Example 4, it was 4.

  In addition, the nonwoven fabrics of Examples 5 to 9 were not affected by the wiping direction, showed good wiping properties, and had few wiping lines remaining due to dirt. On the other hand, the non-woven fabric of Comparative Example 4 has good dirt scraping property, but there are wiping lines due to a large amount of dirt in all directions of MD, CD, and diagonal, and the non-woven fabric of Comparative Example 7 has a dirt scraping property. Although it is good, there are wiping lines due to a large amount of dirt in the MD and oblique directions, and the nonwoven fabrics of Comparative Examples 6, 8 and 9 have good scraping properties, but the wiping lines due to a large amount of dirt in the MD direction. was there. The non-woven fabric of Example 6 having the plain and aperture pattern simultaneously meandering is the nonwoven fabric of Comparative Example 4 having the entire aperture pattern and the non-woven fabric of Comparative Example 7 having the plain and aperture pattern formed linearly. Compared to non-woven fabrics, it has excellent wiping properties. In addition, the nonwoven fabric of Example 6 has a larger breaking strength in the MD direction and a stress at 10% elongation than the nonwoven fabrics of Comparative Example 4 and Comparative Example 7, so that there is less warping during wiping, and the fibers fall off. There is an advantage in that there are few. The non-woven fabric of Example 7 having a plain and serpentine pattern meandering at the same time is compared with the non-woven fabric of Comparative Example 5 of the entire surface of the Sayaka pattern and the non-woven fabric of Comparative Example 8 having the plain and the Sayaka pattern formed linearly. Excellent wipeability. In addition, the nonwoven fabric of Example 7 has a higher elongation at break than the nonwoven fabrics of Comparative Example 5 and Comparative Example 8, and is suitable for applications that require stretchability. In addition, the nonwoven fabric of Example 7 has a higher breaking strength than the nonwoven fabric of Comparative Example 8, and is excellent in handleability when tension is applied to the nonwoven fabric during wiping. The nonwoven fabric of Example 9 is superior to the nonwoven fabric of Comparative Example 9 in that it has a large stress at 10% elongation, so that there is less warping during wiping and less fiber loss.

  The nonwoven fabric of the present invention is also useful for medical materials such as surface sheets, second sheets and gauze for absorbent articles, table cloths, face masks, filters, packaging materials, mats, cushion materials, carpet backing materials, wallpaper, etc. Particularly, it is suitable for wiping materials such as precision wipers, cleaning wipers, wet wipers and wipes. The nonwoven fabric of the present invention is suitable for wet wipes such as wet wipers, wet tissues, or disposable towels when the constituent fibers contain 10% by mass of hydrophilic fibers. When the nonwoven fabric of the present invention contains 5% by mass or more of split-type composite fibers made of incompatible two-component resins 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, 1a, 1b Water flow (water jet: WJ)
2 Perforated member 2a Hole 3 Non-woven fabric 4 Transport support 7 Water nozzle 8a, 8b Non-woven fabric width direction (CD direction)
10 Hydroentanglement processing device 11, 14, 17, 20, 23, 26, 50, 60, 70, 80, 90, 100, 110, 120, 130 Non-woven fabric 12, 15, 18a, 18b, 21a, 21b, 24, 42 51a, 51b, 61a, 61b, 71a, 71b, 81a, 81b, 91a, 91b, 101a, 101b, 111, 121 The first interlaced parts 13, 16, 19a, 19b, 22a, 22b, 25, 41, 52a, 52b, 62a, 62b, 72a, 72b, 82a, 82b, 92a, 92b, 102a, 102b, 112, 122 Second interlaced portion 113 Third interlaced portion

Claims (9)

A nonwoven fabric comprising a fiber assembly,
The nonwoven fabric has a first entangled part and a second entangled part,
The second entangled portion has a regular pattern formed by hydroentangling constituent fibers of a predetermined portion of the nonwoven fabric,
The first entangled part and the second entangled part are separated from each other and exist in a plurality of rows,
A nonwoven fabric characterized in that at least one of the first entangled portion and the second entangled portion meanders along one direction of the nonwoven fabric while maintaining an interval of 2 mm or more in width.   The nonwoven fabric according to claim 1, wherein the first entangled portion and the second entangled portion meander along one direction of the nonwoven fabric while maintaining an interval of 2 mm or more in width.   The nonwoven fabric according to claim 1 or 2, wherein the meandering of the second entangled portion is regularly repeated at a cycle of 5 to 200 mm.   The nonwoven fabric according to any one of claims 1 to 3, wherein the regular pattern is an aperture pattern.   The nonwoven fabric according to any one of claims 1 to 4, wherein the first entangled portion is formed by hydroentanglement.   The wiping material containing the nonwoven fabric of any one of Claims 1-5. Second entanglement having a regular pattern by rearranging a part of the constituent fibers by hydroentangling a part of the constituent fibers of the fiber assembly on a predetermined support having a regular pattern And a second entangled portion and a first entangled portion that is spaced apart from each other, and a method of manufacturing a nonwoven fabric that forms a plurality of rows,
At the time of water entanglement forming the second entangled portion, at least one of the first entangled portion and the second entangled portion is caused by injecting a pressurized water flow onto the nonwoven fabric through the perforated member and vibrating the perforated member. A method for producing a non-woven fabric, characterized by being formed by meandering.   The method for producing a nonwoven fabric according to claim 7, wherein the first entangled portion and the second entangled portion are formed by meandering.   The direction of vibrating the perforated member is the width direction of the nonwoven fabric or the direction in which the angle is in the range of more than 0 degree and 45 degrees or less from the width direction, The nonwoven fabric production according to claim 7 or 8 Method.

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