JP2022050153A - Nonwoven fabric and its manufacturing method, and wiper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nonwoven fabric having a stronger tensile strength in a direction orthogonal to a direction in which each row constituting a fringe extends.
A non-woven fabric including a first entangled portion and a second entangled portion, wherein the first entangled portion and the second entangled portion are present in a striped shape, and the second entangled portion and the first entangled portion are present. Have different patterns from each other, or one of the second entanglement portion and the first entanglement portion is unpatterned, the other has a pattern, and the tension of the non-woven fabric in the direction in which the first entanglement portion extends. A non-woven fabric in which the strength S1 and the tensile strength S2 of the non-woven fabric in a direction orthogonal to the direction in which the first entangled portion extends satisfy S1 <S2.
[Selection diagram] None

Description

The present disclosure relates to a non-woven fabric having a striped pattern as a whole and having a larger tensile strength in a direction in which the striped pattern is repeated, and a wiper using the same.

One of the uses of non-woven fabric is a wiper for wiping dirt from a human body or an object. Various types of wiper configurations have been proposed depending on the purpose of the wiper (the object to be wiped (whether it is a person or an object), the type of dirt to be wiped).

As one of the methods for improving the wiping performance of the wiper, it has been proposed that the non-woven fabric has a three-dimensional pattern and that more dirt is scraped off by using the unevenness formed by the pattern. For example, Patent Document 1 proposes a non-woven fabric in which open rows in which through openings are continuously connected and non-open rows are alternately present. Further, in view of the fact that the strength characteristics of the nonwoven fabric disclosed in Patent Document 1 are not sufficient, Patent Document 2 exhibits a striped pattern by having a plurality of stripes each having a regular pattern and being separated from each other. , We are proposing a non-woven fabric with a stripe width of 4 mm to 50 mm. In the nonwoven fabrics disclosed in these patent documents, each row constituting the striped pattern extends in the MD direction (also referred to as a mechanical direction or a vertical direction) of the nonwoven fabric.

Japanese Unexamined Patent Publication No. 2000-45161 Japanese Unexamined Patent Publication No. 2009-287158

The present disclosure provides a nonwoven fabric having higher tensile strength in a direction orthogonal to the direction in which each row constituting the fringe extends.

The present disclosure is, in the first gist, a nonwoven fabric comprising a first entangled portion and a second entangled portion.
The first entangled portion and the second entangled portion exist in a striped pattern.
The second entanglement and the first entanglement have different patterns from each other, or one of the second entanglement and the first entanglement is unpatterned and the other has a pattern.
The tensile strength S1 of the nonwoven fabric in the direction in which the first entangled portion extends and the tensile strength S2 of the nonwoven fabric in the direction orthogonal to the direction in which the first entangled portion extends satisfy S1 <S2.
Provide non-woven fabric.

This disclosure is in the second gist.
Making a textile web,
Including placing the fiber web on a support and subjecting the fiber web to entanglement with a high pressure fluid flow.
In the entanglement process, it is assumed that the first section and the second section extending along the CD direction are present in a striped pattern on the fiber web.
The treatment conditions when the first section of the fiber web is subjected to the entanglement treatment and the treatment conditions when the second section of the fiber web is subjected to the entanglement treatment are different from each other, and the first section after the entanglement treatment is performed. The first entangled portion, which is one section, and the second entangled portion, which is the second section after entanglement processing, have different patterns from each other, or the first entanglement portion, which is the first section after entanglement processing, and the first after entanglement. The entanglement process is performed so that one of the two sections of the second entanglement portion has no pattern and the other has a pattern.
Provided is a method for manufacturing a nonwoven fabric.

In the nonwoven fabric of the present disclosure, the tensile strength S1 in the direction in which the first entangled portion and the second entangled portion constituting the striped pattern extend and the tensile strength S2 in the direction orthogonal to the direction have a relationship of S1 <S2. Meet. Therefore, the non-woven fabric is less likely to be deformed in the direction orthogonal to the direction in which the first entangled portion and the second entangled portion extend. When this is used, for example, as a wiper, stains can be satisfactorily wiped off by a striped pattern.

It is a top view which shows the acute angle a formed by the diagonal line of the diagonal line pattern and the direction in which the 1st entanglement part extends when the 1st entanglement part has a diagonal line pattern. FIG. 3 is a plan view showing the shortest distance D between the centers of adjacent openings when the second entanglement portion has a pattern in which the openings are arranged in a staggered pattern.

(Background to this embodiment)
In each of the nonwoven fabrics disclosed in Patent Documents 1 and 2, the striped pattern, that is, the rows or pattern portions constituting the striped pattern are formed mainly in the MD direction of the nonwoven fabric, and the pattern is formed along the CD direction. That is, the uneven pattern) is changing. In these non-woven fabrics, since the fibers are oriented in the MD direction, the strength in the MD direction is high, and the fibers are easily broken and deformed in the CD direction (also referred to as the lateral direction). That is, when these non-woven fabrics are used for wiping, for example, when the non-woven fabric is placed on a dirty object and the non-woven fabric is moved in a direction parallel to the CD direction to rub the object, the non-woven fabric breaks without wiping the dirt on the object. It tends to occur. Therefore, even if these non-woven fabrics are moved in the CD direction and an attempt is made to wipe off the stains by utilizing the change in the pattern in the CD direction, the non-woven fabrics may be twisted and the wiping property by the stripes may not be exhibited.

Therefore, the present inventors have configured each row constituting the striped pattern to extend in a direction (for example, the CD direction) orthogonal to the direction in which the mechanical strength of the nonwoven fabric is higher (for example, the MD direction). Considering that the above problem could be solved, we examined to realize this configuration. Then, the nonwoven fabric having the above structure is assumed to have the first section and the second section extending along the CD direction in a striped pattern on the fiber web, and the first section of the fiber web is subjected to the entanglement treatment. The present embodiment has been found by finding that the treatment conditions of the above and the treatment conditions when the second section of the fiber web is subjected to the entanglement treatment are different from each other and the entanglement treatment is carried out.

(Embodiment 1: Nonwoven fabric)
The nonwoven fabric described as the first embodiment is a nonwoven fabric including a first entangled portion and a second entangled portion.
The first entangled portion and the second entangled portion exist in a striped pattern.
The second entanglement and the first entanglement have different patterns from each other, or one of the second entanglement and the first entanglement is unpatterned and the other has a pattern.
The tensile strength S1 of the nonwoven fabric in the direction in which the first entangled portion extends and the tensile strength S2 of the nonwoven fabric in the direction orthogonal to the direction in which the first entangled portion extends satisfy S1 <S2.
It is a non-woven fabric.

[1st confounding part and 2nd confounding part]
The first entangled portion and the second entangled portion included in the nonwoven fabric of the present embodiment are present in a striped pattern and have different patterns from each other, or either the second entangled portion or the first entangled portion is used. It is unpatterned and the other has a pattern.
Here, "no pattern" does not make the design feel, and may have, for example, texture unevenness that occurs force majeure during web formation, nozzle streaks that occur force majeure during water flow confounding processing, and the like. However, it means that the intentional pattern is not added. More specifically, it is a convex portion, a concave portion, an opening, or the like, and its longest dimension (excluding the dimension in that direction when it extends continuously in one direction like a nozzle streak) is 0. When it is 1 mm or less, such protrusions, recesses, openings, etc. are not considered to form a pattern.

"Existing in stripes" means that these entangled parts repeatedly exist with a certain regularity as streaks extending in a certain direction. For example, when the nonwoven fabric of the present embodiment has only the first entangled portion and the second entangled portion, the first entangled portion and the second entangled portion are alternately and repeatedly present. When a third entanglement portion is provided in addition to the first entanglement portion and the second entanglement portion, these entanglement portions are, for example, the 1st 2-1st 1st-3rd, 1st-1st-2nd-3rd, and 1st entanglement portions. It may exist with the regularity of 2-first 1-3.

As long as the patterns of the first entanglement part and the second entanglement part have different patterns from each other, or one of the first entanglement part and the second entanglement part has a pattern and the other has a pattern, the form thereof is. Not particularly limited. The pattern may be formed, for example, by regularly arranging a region with a lower fiber density (“low density region”) and a region with a higher fiber density (“high density region”). .. In this case, the low density area is at least one pattern selected from the group consisting of regular patterns such as dot pattern, cedar twill pattern, checkered pattern, lattice pattern, staggered pattern, diagonal line pattern, wavy pattern, and zigzag pattern. May be.

The low density region may be a recess that is smaller in thickness than the high density region and is recessed from the high density region, or may be an open hole in which no fiber is present. In one entangled portion, recesses and openings may coexist as low-density regions. In particular, when forming an opening, depending on the manufacturing conditions, not all the low-density regions can be opened, and a part of the low-density region may exist as a recess. Such an embodiment is also acceptable in this embodiment.

In the present embodiment, the pattern of the first entanglement portion is preferably a diagonal line pattern. The diagonal line pattern is a pattern in which low-density regions and high-density regions extending in the diagonal direction are alternately arranged, and the "diagonal direction" is a direction that is not parallel to the MD direction and the CD direction of the nonwoven fabric in the present embodiment. Point to. The entangled portion having a diagonal pattern tends to improve the wiping property when the non-woven fabric is used as a wiper.

When the first entangled portion has a diagonal pattern, the acute angle a (see FIG. 1) formed by the diagonal line of the diagonal pattern and the direction in which the first entangled portion extends may be 10 degrees or more and 80 degrees or less, and particularly 15 degrees or more and 75 degrees or more. It may be 20 degrees or less, more particularly 20 degrees or more and 70 degrees or less. If the acute angle a is too small, the direction of the diagonal line approaches the direction in which the first entanglement portion extends, and if the acute angle a is too large, the direction of the diagonal line approaches the direction orthogonal to the direction in which the first entanglement portion extends. However, it becomes difficult to obtain the effect of improving the wiping property. Here, the extending direction of the first entanglement portion is a direction that satisfies S1 <S2 when the tensile strength of the nonwoven fabric in the direction is S1 and the tensile strength of the nonwoven fabric in the direction orthogonal to the direction is S2. , Generally in the CD direction of non-woven fabric. Further, the extending direction of the first entangled portion is also the extending direction of the second entangled portion.

The second entanglement portion may be a pattern in which the openings are regularly arranged. The pattern in which the openings are regularly arranged may be, for example, a pattern in which the openings are arranged in a staggered pattern, a pattern in which the openings are arranged squarely, or the like. In a pattern in which the openings are regularly arranged, the shortest distance between the centers of adjacent openings may be, for example, 1.0 mm or more and 4.0 mm or less, particularly 1.3 mm or more and 3.0 mm or less, and more particularly. May be 1.6 mm or more and 2.5 mm or less. Here, the shortest distance between the centers of adjacent openings is the shortest of the line segments connecting the centers in all combinations of adjacent openings. For example, when the openings are formed in a staggered pattern as shown in FIG. 2, the shortest distance between the centers of the adjacent openings is the distance indicated by the reference numeral D.

When the second confounding part is a pattern formed by the regular arrangement of the openings, the area of one opening may be, for example, 0.50 mm ² or less, particularly 0.45 mm ² or less, and more particularly 0. It may be 40 mm ² or less. The lower limit of the area of the opening may be, for example, 0.01 mm ² , particularly 0.02 mm ² , and more particularly 0.03 mm ² . If the area of the hole is too large, the strength of the non-woven fabric may be reduced, and when used as a wiper, the wiped dirt may adhere to the hand or jig through the hole, or the wiped dirt may be opened. It may be easier to detach from the hole. If the area of the holes is too small, it is no longer possible to say that the pattern is formed, and it may not be possible to obtain the effect of improving the wiping property of the pattern.

Further, when the second entanglement portion is patterned to be formed by the regular arrangement of the openings, the ratio of the openings to the second entanglement portion may be, for example, 1% or more and 30% or less, and particularly 3% or more. It may be 20% or less, more particularly 5% or more and 10% or less. If the ratio of the openings to one entangled portion is too small, it may not be possible to obtain the effect of improving the wiping property due to the formation of the openings. If the ratio of the perforations to one confounding part is too large, the strength of the non-woven fabric may decrease, and when used as a wiper, the wiped dirt may adhere to the hands or jig through the perforations. Alternatively, the wiped dirt may be easily removed from the opening.

When either one of the first entanglement portion and the second entanglement portion is unpatterned, the entanglement portion of the other may be a diagonal line pattern or a pattern formed by the regular arrangement of openings. In particular, when the other entangled portion has a diagonal line pattern, the difference in thickness from the non-patterned portion becomes large, and when used as a wiper, the scraping property tends to be improved.

As described above, in the nonwoven fabric of the present embodiment, the first entangled portion and the second entangled portion exist in a striped pattern and exist in a pattern repeated in a certain direction to form a pattern. When the non-woven fabric has only the first entangled portion and the second entangled portion, the first entangled portion and the second entangled portion are alternately present in the direction orthogonal to the direction in which the first entangled portion and the second entangled portion extend. A striped pattern is formed. When the first entanglement portion and the second entanglement portion extend parallel to, for example, the CD direction of the non-woven fabric, the striped pattern appears in the MD direction, and the CD direction is "horizontal" and the MD direction is "vertical". Will form a horizontal striped pattern in which two types of linear portions extending in the horizontal direction are alternately arranged in the vertical direction.

The first entangled portion may have dimensions of, for example, 2 mm or more and 200 mm or less, particularly 3 mm or more and 100 mm or less, more particularly 5 mm or more and 50 mm or less, and more particularly particularly, in a direction orthogonal to the direction in which the first entangled portion extends. It may have dimensions of 7 mm or more and 30 mm or less, and more particularly 10 mm or more and 25 mm or less. The second entangled portion may also have dimensions of, for example, 2 mm or more and 200 mm or less, particularly 3 mm or more and 100 mm or less, more particularly 5 mm or more and 50 mm or less, and more particularly particularly, in a direction orthogonal to the direction in which the first entangled portion extends. It may have dimensions of 7 mm or more and 30 mm or less, and more particularly 10 mm or more and 25 mm or less. The dimension in the direction orthogonal to the direction in which the first entangled portion extends of the first entangled portion (hereinafter, referred to as “width” for convenience) and the width of the second entangled portion may be the same or different. Further, in one nonwoven fabric, a plurality of first entangled portions having different widths may be present, and / or a plurality of second entangled portions having different widths may be present.

If the width of the first entangled portion is too small, the design effect due to the formation of the striped pattern may not be sufficiently obtained, and when the non-woven fabric is used as a wiper, the wiping performance is insufficient. There is. The same applies when the width of the second entangled portion is too small. If the width of the first entangled portion is too large, the design effect may not be sufficiently obtained, and the wiping performance may be insufficient. The same applies when the width of the second entangled portion is too large.

As described above, in the nonwoven fabric of the present embodiment, the tensile strength S1 of the nonwoven fabric in the direction in which the first entanglement portion extends and the tensile strength S2 of the nonwoven fabric in the direction orthogonal to the direction in which the first entanglement portion extends are S1 <S2. Meet. In general, the nonwoven fabric has a larger tensile strength in the MD direction (the direction in which the distance of the nonwoven fabric produced increases with the production of the nonwoven fabric) and is orthogonal to the CD direction (perpendicular to the MD direction, and during the fabrication of the nonwoven fabric). It has a smaller tensile strength in the given direction). Therefore, in the present embodiment, the direction in which the first entanglement portion and the second entanglement portion extend is generally the CD direction of the nonwoven fabric. The tensile strength S1 (N / 5 cm) and the tensile strength S2 (N / 5 cm) may satisfy S1 + 10 <S2 in particular, more particularly S1 + 20 <S2, and even more particularly S1 + 30 <S2. Alternatively, the relationship between the tensile strength S1 (N / 5 cm) and the tensile strength S2 (N / 5 cm) may be expressed by the ratio of S2 to S1 (S2 / S1). In this case, the value of S2 / S1 may be particularly 2.0 or more and 20 or less, more particularly 3.0 or more and 15 or less, and even more particularly 4.0 or more and 8.0 or less. It's okay.

[Fibers that make up non-woven fabric]
The fibers constituting the non-woven fabric of the present embodiment are not particularly limited, and those used in the production of non-woven fabric may be arbitrarily adopted. The nonwoven fabric of the present embodiment is, for example,
Polyester-based resins such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, and copolymers thereof, polyamide resins such as nylon 6, nylon 66, and copolymers thereof, polymethylpentene, polypropylene, and polyethylene (high). Selected from polyolefin resins (including density polyethylene, low density polyethylene, linear low density polyethylene), acrylic resins, polycarbonates, polyacetals, engineering plastics such as polystyrene and cyclic polyolefins, and their elastomers, 1 Or synthetic fibers made of multiple thermoplastic resins,
Natural fibers such as cotton, silk, wool, linen, and pulp, as well as rayon and polynosic obtained by the viscose method, cupra obtained by the cuprammonium method, and cellulosic fibers obtained by the solvent spinning method (lyocell and tencel (registered). Recycled fibers (including those whose surface has been treated with a hydrophobic agent), such as (trademark)), etc.
It may be formed of one or more fibers selected from cellulosic fibers obtained by a melt spinning method and semi-synthetic fibers such as acetate fibers.

The synthetic fiber may be either a single fiber or a composite fiber. The composite fiber may be, for example, a concentric or eccentric core-sheath type composite fiber, a sea-island type composite fiber, a side-by-side type composite fiber, or a split type composite fiber.

Synthetic fibers may also be melted or softened by heating or the like to exhibit adhesiveness. For example, the synthetic fiber may be a single fiber or a composite fiber containing a resin having a relatively low melting point such as polyethylene as one component, and the low melting point resin component occupies at least a part of the fiber surface. Such a fiber is, for example, a core-sheath type composite fiber composed of a combination of polyethylene / polypropylene and polyethylene / polyethylene terephthalate, in which polyethylene is a sheath component, or a split type composite fiber composed of a combination of these thermoplastic resins.

In the case of a core-sheath type composite fiber, the composite ratio of the core component to the sheath component (core component: sheath component) is preferably 80:20 to 20:80 in volume ratio, and is 70:30 to 30:70. More preferably, it is more preferably 60:40 to 40:60.

In the case of the split type composite fiber, the ratio of the two components (first 1: second) is preferably 80:20 to 20:80, more preferably 70:30 to 30:70 in terms of volume ratio. , 60:40 to 40:60 is more preferable. In the case of a split type composite fiber, the number of divisions (that is, the number of sections in the composite fiber) may be, for example, 4 or more and 32 or less, particularly 4 or more and 20 or less, and more particularly 6 or more. It may be 10 or less.

When a synthetic fiber capable of adhering fibers to each other is used, the synthetic fiber may be contained, for example, 5% by mass or more, particularly 10% by mass or more, and more particularly, when the total mass of the non-woven fabric is 100% by mass. May be contained in an amount of 15% by mass or more. The upper limit of the proportion of the adhesive synthetic fiber is, for example, 35% by mass, particularly 30% by mass, and more particularly 25% by mass. If the proportion of the adhesive synthetic fiber is too small, the effect of adhering the fibers to each other (for example, improvement of mechanical strength of the non-woven fabric, suppression of fluffing, maintenance of the imparted pattern) may not be sufficiently obtained. be. If the proportion of the adhesive synthetic fiber is too large, the texture of the non-woven fabric becomes hard and the drape property deteriorates, which may affect the wiping property when used as a wiper.

The nonwoven fabric of the present embodiment may contain cellulosic fibers in an amount of, for example, 30% by mass or more, particularly 50% by mass or more, and more particularly 80% by mass or more. Here, the cellulosic fibers include natural fibers derived from plants such as cotton, linen, ramie, jute, hemp, and pulp; rayon and polynosic obtained by the biscous method, and cupra obtained by the copper ammonia method. , And regenerated fibers such as cellulosic fibers obtained by the solvent spinning method (rayon lyocell (registered trademark) and tencel (registered trademark), etc.), cellulose fibers obtained by the melt spinning method, and semi-synthetic fibers such as acetate fibers. Can be mentioned. Cellulose-based fibers give a clear pattern because the fibers are easily entangled with each other and the entangled state is maintained well even after the entanglement treatment, especially when the non-woven fabric is produced by the entanglement treatment using a high-pressure fluid flow. Facilitates the formation of the non-woven fabric. In addition, the fibers are well entangled with each other, so that the fluffing of the non-woven fabric is suppressed.

The fineness of the fiber is not limited as long as a pattern is formed on both or one of the first and second entanglements, and is selected depending on the use of the nonwoven fabric and the like. The fineness of the fiber may be, for example, 0.3 dtex or more and 10 dtex or less, particularly 0.5 dtex or more and 5.0 dtex or less, more particularly 0.7 dtex or more and 4.0 dtex or less, and even more. In particular, it may be 1.0 dtex or more and 3.0 dtex or less, and more particularly 1.3 dtex or more and 2.5 dtex or less. When the fiber constituting the non-woven fabric is a natural fiber such as cotton, it may be difficult to use a fiber having a specific fineness range, and in that case, fibers having various finenesses may be included. If the fineness of the fibers is too small, the fibers may be entangled with the support when the nonwoven fabric is manufactured by the entanglement treatment using a high-pressure fluid flow, or the support may be clogged with the fibers. If the fiber is too fine, the pattern may be blurred.

The fiber length of the fiber is also not limited as long as a pattern is formed on both or one of the first and second entangled portions, and is selected according to the manufacturing conditions of the nonwoven fabric and the like. The fiber length of the fiber is, for example, 10 mm or more and 100 mm or less. If the fiber length is outside this range, it may be difficult to make a fiber web using, for example, a carding machine. Further, in a non-woven fabric having a low basis weight, if the fiber length exceeds 100 mm, the number of fibers constituting the non-woven fabric decreases, so that the texture of the non-woven fabric may not be stable or the required strength of the nonwoven fabric cannot be obtained. There is. Further, if the fiber length is too small, the strength of the nonwoven fabric may be reduced, and if the fiber length is too large, the pattern may not be clear. The fiber length is more preferably 25 mm or more and 90 mm or less, further preferably 32 mm or more and 70 mm or less, and particularly preferably 38 mm or more and 65 mm or less. Alternatively, when the nonwoven fabric is produced by a method including producing a fiber web by an air array method or a wet papermaking method, the fiber length may be, for example, 2 mm or more and 20 mm or less.

[Form of non-woven fabric]
The nonwoven fabric may have a single-layer structure or a laminated structure. The non-woven fabric is formed from a web selected from card webs such as parallel webs, cross webs, semi-random webs and random webs, air array webs, wet papermaking webs, melt blown webs, spunbond webs and the like. good. If the cellulosic fibers are all or part of the constituent fibers, a web selected from card webs, air array webs, and wet papermaking webs may be made. When a non-woven fabric is produced by entanglement treatment using a high-pressure fluid flow using these fiber webs containing cellulosic fibers, the fibers are easily entangled with each other, and the entangled state is good even after the entanglement treatment. Gives a non-woven fabric that is kept. As a result, it becomes easy to form a clear pattern on the nonwoven fabric, and the fibers are entwined well with each other, so that the fluffing of the nonwoven fabric is suppressed.

Further, by forming the nonwoven fabric into a laminated structure including an air array web, a wet papermaking web, a melt blown web or a spunbond web, the mechanical strength of the nonwoven fabric can be improved.

[Physical characteristics of non-woven fabric]
Hereinafter, the physical characteristics of the nonwoven fabric of the present embodiment will be exemplified. It should be noted that the nonwoven fabric of the present embodiment is not limited to those having the following physical properties because the physical properties of the nonwoven fabric change depending on the fibers constituting the nonwoven fabric, the basis weight of the nonwoven fabric, and the manufacturing conditions of the nonwoven fabric.

The thickness of the nonwoven fabric of the present embodiment (at a load of 294 Pa) may be, for example, 0.50 mm or more and 1.0 mm or less, particularly 0.55 mm or more and 0.90 mm or less, and more particularly 0.60 mm or more and 0.80 mm. It may be as follows.

The nonwoven fabric of the present embodiment has a striped pattern formed by a first entangled portion and a second entangled portion having different patterns from each other, or one having no pattern and the other having a pattern. .. When the line of sight of this non-woven fabric is aligned so as to be orthogonal to the MD and CD directions and the amount of change in thickness is observed, the amount of change in thickness in one direction is significantly larger than that in the other. It is a thing. The amount of change in thickness can be determined by measuring the thickness with a microscope under a load of 40 Pa. Specifically, the thickness measurement using a microscope is carried out as follows.

<Measurement method of thickness with a microscope>
The non-woven fabric is cut with a sharp cutting tool so that a rectangular sample whose sides are parallel to the MD direction and the CD direction can be obtained. The cut non-woven fabric is placed on a smooth table, a load of 40 Pa is applied, and a microscope is applied from the side of the cut surface obtained by cutting in the direction perpendicular to the MD direction. Measure the distance (thickness) in. The measurement is carried out at 6 points, and this average value is taken as the average value of the thickness in the MD direction. Similarly, a microscope is applied from the side of the cut surface obtained by cutting in the direction perpendicular to the CD direction, and the distance (thickness) in the thickness direction is measured at the portion where the fiber is present. The measurement is carried out at 6 points, and this average value is taken as the average value of the thickness in the CD direction.

When two entangled portions are arranged in a striped pattern as in the non-woven fabric of the present embodiment, the cut surface is only the first entangled portion or only the second entangled portion depending on the cutting direction (the cut surface of only the first entangled portion or the second entangled portion). It can be a cut surface consisting of any one confounding part). In that case, the thickness is measured at the cut surface of only one of the confounding portions.

When the thickness of the nonwoven fabric of the present embodiment is obtained by the above method, the average value of the thickness in the MD direction is, for example, 0.50 mm or more and 1.5 mm or less, particularly 0.60 mm or more and 1.0 mm or less, and more particularly 0. It may be .65 mm or more and 0.90 mm or less. The average value of the thickness in the CD direction may be, for example, 0.50 mm or more and 1.5 mm or less, particularly 0.60 mm or more and 1.0 mm or less, and more particularly 0.65 mm or more and 0.90 mm or less.

Further, in the nonwoven fabric of the present embodiment, the coefficient of variation of the thickness of the nonwoven fabric in the CD direction may be 0.09 or more, particularly 0.12 or more, and more particularly 0.15 or more. The upper limit of the coefficient of variation of the thickness of the nonwoven fabric in the CD direction may be, for example, 0.30. The coefficient of variation of the thickness in the CD direction is the standard deviation σ from the data obtained by measuring the thickness at 6 points when only one confounding part is seen on the cut surface (when the cutting surface consists of one confounding part). And calculate the coefficient of variation from the following formula. When multiple types of confounding parts are found on the cut surface (when the cut surface consists of multiple confounding parts), the thickness of 6 points is measured at each confounding part, and (6 × types of entangled parts). The standard deviation is calculated from the measured data, and the coefficient of variation is calculated from the following formula.
Coefficient of variation of thickness = standard deviation σ / mean value of thickness

The coefficient of variation in the thickness of the non-woven fabric indicates the variation in the thickness of the non-woven fabric in the direction, and the larger the coefficient of variation, the more firmly the unevenness is formed along the direction. If the coefficient of variation of the thickness of the non-woven fabric is too small, the unevenness is small and the wiping property may be inferior when used as a wiper. May decrease.

The basis weight of the nonwoven fabric of the present embodiment is not particularly limited, and may be appropriately selected depending on the intended use and the like. For example, when the nonwoven fabric of the present embodiment is used as a wiper, the basis weight may be 30 g / m ² or more and 80 g / m ² or less, particularly 35 g / m ² to 75 g / m ² , and more particularly 40 g. It may be / m ² to 70 g / m ² . Alternatively, when the nonwoven fabric of the present embodiment is used as a sanitary product, its basis weight may be 20 g / m ² to 70 g / m ² , particularly 25 g / m ² to 65 g / m ² , and more particularly 30 g. It may be / m ² to 60 g / m ² . If the basis weight is too large, a pattern may be formed on only one side, and the effect of the pattern may be exhibited on only one side. If the basis weight is too small, a clear pattern may not be formed and the effect of the pattern may not be exhibited.

The nonwoven fabric of the present embodiment has a tensile strength of 25N / 5cm to 140N / 5cm, particularly 30N / 5cm to 100N / 5cm, more particularly 35N / 5cm to 80N / in the direction orthogonal to the direction in which the first entanglement portion extends. It may have a tensile strength of 5 cm. Further, the nonwoven fabric has a tensile strength of 3.0N / 5cm to 25N / 5cm, particularly 3.5N / 5cm to 23N / 5cm, more particularly 4.0N / in the direction parallel to the direction in which the first entanglement portion extends. It may have a tensile strength of 5 cm to 20 N / 5 cm, and more particularly 5.0 N / 5 cm to 15 N / 5 cm. If the tensile strength in the direction orthogonal to the direction in which the first entanglement extends and / or the tensile strength in the direction parallel to the direction in which the first entanglement extends is too high, the texture may deteriorate, and if it is too low, The morphological stability of the non-woven fabric may not be sufficient.

Further, the nonwoven fabric of the present embodiment has an elongation rate of 20% to 50%, particularly 23% to 47%, and more particularly 26% to 43%, in a direction orthogonal to the direction in which the first entanglement portion extends. It may have an elongation of 70% to 140%, particularly 75% to 125%, more particularly 80% to 110% in a direction parallel to the direction in which the first entanglement extends. .. If the elongation rate in the direction orthogonal to the direction in which the first entanglement portion extends and / or the elongation rate in the direction parallel to the extension direction of the first entanglement portion is too high, elongation tends to occur and the morphological stability of the nonwoven fabric becomes insufficient. If it is too low, the non-woven fabric will not stretch when an external force is applied and will break immediately, which may result in insufficient morphological stability.

Further, the nonwoven fabric of the present embodiment has a stress at 10% elongation of 4.5N / 5cm to 110N / 5cm, particularly 5.5N / 5cm to 100N / 5cm, in a direction orthogonal to the direction in which the first entanglement portion extends. In particular, it may have a 10% elongation stress of 8.0 N / 5 cm to 50 N / 5 cm, and even more particularly 12 N / 5 cm to 25 N / 5 cm. Further, the nonwoven fabric has a stress at 10% elongation of 0.6N / 5cm to 3.0N / 5cm, particularly 0.7N / 5cm to 2.5N / 5cm, in a direction parallel to the direction in which the first entanglement portion extends. In particular, it may have a 10% elongation stress of 0.8 N / 5 cm to 2.0 N / 5 cm. If the 10% elongation stress in the direction orthogonal to the direction in which the first entanglement extends and / or the 10% elongation stress in the direction parallel to the extension of the first entanglement is too high, the fiber freedom of the nonwoven fabric is small. As a result, it becomes difficult for the nonwoven fabric to follow the shape of the object when it comes into contact with the object, and as a result, the contact area between the object and the nonwoven fabric may be reduced. If it is too low, the morphological stability of the nonwoven fabric becomes insufficient. ..

Further, the nonwoven fabric of the present embodiment has a 20% elongation stress of 15N / 5cm to 140N / 5cm, particularly 17N / 5cm to 100N / 5cm, more particularly 20N / in the direction orthogonal to the direction in which the first entanglement portion extends. It may have a 20% elongation stress of 5 cm to 80 N / 5 cm. Further, the nonwoven fabric has a 20% elongation stress of 1.0 N / 5 cm to 3.5 N / 5 cm, particularly 1.2 N / 5 cm to 3.0 N / 5 cm, in a direction parallel to the direction in which the first confounding portion extends. In particular, it may have a 20% elongation stress of 1.4 N / 5 cm to 2.5 N / 5 cm. If the 20% elongation stress in the direction orthogonal to the direction in which the first entanglement extends and / or the 20% elongation stress in the direction parallel to the extension of the first entanglement is too high, the fiber freedom of the nonwoven fabric is small. As a result, it becomes difficult for the nonwoven fabric to follow the shape of the object when it comes into contact with the object, and as a result, the contact area between the object and the nonwoven fabric may be reduced. If it is too low, the morphological stability of the nonwoven fabric becomes insufficient. Sometimes.

The nonwoven fabric of the present embodiment has lower water absorption and tends to be less likely to cause liquid diffusion as compared with a nonwoven fabric having the same pattern formed on the entire surface. Specifically, the nonwoven fabric of the present embodiment has a water absorption of 1 mm or more and 90 mm or less in the CD direction and 1 mm or more in the MD direction when the water absorption is measured by the Birec method according to JIS L 1907 7.1.2. It may exhibit water absorption of 70 mm or less. Further, in the nonwoven fabric of the present embodiment, when the water absorption in the MD direction is A (mm) and the water absorption in the CD direction is B (mm), the area of the pseudo-diffusion ellipse measured by A × B × π is For example, it may be 146 cm ² or less, particularly 144 cm ² or less, and more particularly 142 cm ² or less. The lower limit of the area of the pseudodiffusion ellipse is, for example, 0.03 cm ² , especially 0.3 cm ² , and more particularly 0.8 cm ² . It is considered that the non-woven fabric of the present embodiment exhibits the above-mentioned water absorption characteristics because the progress of water is hindered by the recesses and openings formed in the first entangled portion and the second entangled portion during water absorption.

(Embodiment 2: Method for Producing Nonwoven Fabric of Embodiment 1)
As the second embodiment, a method for producing the nonwoven fabric of the first embodiment will be described. The nonwoven fabric of the first embodiment is, for example,
Making a textile web,
Including placing the fiber web on a support and subjecting the fiber web to entanglement with a high pressure fluid flow.
In the entanglement process, it is assumed that the first section and the second section extending along the CD direction are present in a striped pattern on the fiber web.
The treatment conditions when the first section of the fiber web is subjected to the entanglement treatment and the treatment conditions when the second section of the fiber web is subjected to the entanglement treatment are different from each other, and the first section after the entanglement treatment is performed. The first entangled portion and the second entangled portion, which is the second section after the entanglement process, have different patterns from each other, or the first entangled portion, which is the first section after the entanglement process, and the second section after the entanglement process. The entanglement process is performed so that one of the second entanglement portions is unpatterned and the other has a pattern.
It can be manufactured by a manufacturing method.

This manufacturing method corresponds to a method in which fibers are entangled with each other to integrate the fibers by injecting a high-pressure fluid flow onto the fiber web. The high-pressure fluid is, for example, a high-pressure gas such as compressed air and a high-pressure liquid such as high-pressure water. In the production of a non-woven fabric, a water flow entanglement treatment using high pressure water as a high pressure fluid is often used, and in this embodiment as well, the water flow entanglement treatment is preferably used from the viewpoint of ease of implementation. Hereinafter, a manufacturing method will be described when a high-pressure water flow (hereinafter, also simply referred to as “water flow”) is used as the high-pressure fluid flow.

In this manufacturing method, when the surface of the fiber web to be subjected to the water flow confounding treatment is viewed, it is assumed that the first section and the second section extending along the CD direction exist in a striped pattern in the fiber web, and two Sections are subjected to water confounding treatment under different treatment conditions. The conditions of the water flow entanglement treatment include, for example, the hole diameter of the orifice, the distance between the orifices, the number of times of water flow injection in the MD direction, the water pressure, the amount of water, the transport speed of the fiber web, and the support for transporting the fiber web during the water flow entanglement treatment. The structure of the surface in contact with the fiber web of the above is included. The water flow confounding treatments in the two sections will be carried out under different treatment conditions by making at least one of them different.

The conditions for the water flow entanglement treatment of the two sections are that the first entangled portion formed by entwining the first section and the second entangled portion formed by entwining the second section have different patterns from each other. One of the first entangled portion formed by entwining the first section and the second entangled portion formed by entwining the second section is selected to be unpatterned and the other to have a pattern. In order to obtain such two entangled portions after the entanglement process, the conditions that make them different from each other may be, for example, the structure of the surface of the support.

For example, as the support, one support in which two types of woven structures are regularly and repeatedly formed along the MD direction (hereinafter, referred to as "striped pattern forming support" for convenience) may be used. .. By spraying a stream of water onto the first and second sections of the fiber web simultaneously on this support (ie, by not changing the conditions under which the stream is jetted between the two sections), as Embodiment 1. The first entanglement portion and the second entanglement portion of the described non-woven fabric can be formed. The first entanglement is re-fibered to have a pattern determined by one of the two woven structures constituting the striped pattern-forming support (referred to as "woven structure A" for convenience). It is arranged and formed to form a streak extending in the CD direction. Similarly, the second entanglement may have a pattern determined by the other woven structure (conveniently referred to as "woven structure B") of the two types of woven structure constituting the striped pattern forming support. , The fibers are rearranged and formed.

In the striped pattern forming support, for example, the woven structure A and the woven structure B are arranged in the order of ABAB ... along the MD direction. Therefore, the first entangled portion and the second entangled portion formed by the woven structures A and B of the support are also formed in the order of the 1st, 2nd, 1st, 2nd, and so on along the MD direction. It will be. Therefore, the nonwoven fabric produced by this method has a striped pattern in which the first entanglement portion and the second entanglement portion extend along the CD direction.

The striped pattern forming support is woven with, for example, a filament having a diameter of 0.5 mm or more and 1.0 mm or less, and a twill weave portion as a weave structure A and a plain weave portion as a weave structure B are alternately formed along the MD direction. It may have been done. According to such a support, a first entangled portion having a diagonal pattern is formed in the twill woven portion, and a second entangled portion in which openings are arranged in a staggered pattern is formed in the plain woven portion. In the support, the woven structure A and the woven structure B may be woven with filaments having different thicknesses as wefts.

In the striped pattern forming support, the MD-direction dimensions of the woven structures A and B are the MD-direction dimensions of the first and second entanglements in the obtained non-woven fabric (that is, the direction in which the first and second entanglements extend). The dimensions of the first and second entanglements in the orthogonal direction) are determined. In the present embodiment, the dimension of the woven structure A in the MD direction may be 2 mm or more and 200 mm or less, particularly 3 mm or more and 100 mm or less, more particularly 5 mm or more and 50 mm or less, further particularly 7 mm or more and 30 mm or less, and even more particularly. It may be 10 mm or more and 25 mm or less. Similarly, the dimension of the woven structure B in the MD direction may be 2 mm or more and 200 mm or less, particularly 3 mm or more and 100 mm or less, more particularly 5 mm or more and 50 mm or less, further particularly 7 mm or more and 30 mm or less, and even more particularly 10 mm or more. It may be 25 mm or less. The dimensions of the woven structure A in the MD direction may be the same as or different from the dimensions of the woven structure B in the MD direction. Further, in one support, a plurality of woven structures A having different dimensions in the MD direction may be present, and / or a plurality of woven structures B having different dimensions in the MD direction may be present.

When the weaving structure A is a twill weft, in addition to the fiber diameter, warp density and weft density of the monofilament, the number of warps floating above and / or sinking under the weft in the twill weft also determines the number. 1 The morphology of the diagonal pattern at the entanglement part changes. The twill weave structure consists of either adjacent or non-adjacent locations where the warps float on the wefts, and when the floating parts of the warps are connected by a straight line, all the floating parts are connected. When a straight line extending diagonally can be drawn in the included state, the first entangled portion of the diagonal line pattern is obtained. If the straight line cannot be drawn, a mottled first confounding portion is obtained.

When the woven structure B is a plain woven portion, the size of the opening formed in the second entanglement portion changes depending on the fiber diameter of the monofilament constituting the structure, and the larger the fiber diameter of the monofilament, the larger the opening area. It tends to be. Further, the spacing between the openings varies depending on the weft density and the warp density of the plain weave portion, and as the weft density and / or the warp density increases, the spacing between the openings tends to become narrower.

In the striped pattern forming support, the woven structures A and B may both be plain woven portions. In that case, the two weft structures can be different from each other by varying the thickness of the weft and / or the density of the weft. Further, the woven structures A and B may both be twill woven portions. In that case, the two weaving structures are different from each other by using one method selected from changing the number of warps floating on the weft, changing the number of sinking under the weft, changing the thickness of the weft, etc. Can be.

When the woven structure B is a fine-grained plain woven portion (for example, 80 mesh or more and 100 mesh or less), a patternless second entangled portion is formed corresponding to the structure. In this case, the woven structure A may be a structure capable of forming a pattern, for example, a twill woven portion, or a plain woven portion made of a filament having a large diameter.

Alternatively, the condition of the water flow entanglement treatment is a plate processed into a shape between the fiber web and the nozzle so that the water flow does not hit the fiber web at the portion corresponding to one section (hereinafter, "intercalated disc"). Can also be made different between the two sections by arranging and advancing according to the advancing speed of the fiber web. Such an intercalated disc may be a ladder-shaped plate in which rectangular openings are provided at regular intervals in the MD direction (the traveling direction of the fiber web). In the part where the injection of the water flow is hindered by the intercalated disc, the entanglement does not proceed in the fiber web and becomes unpatterned, and in the part located at the opening of the intercalated disc and the water flow is injected, the entanglement progresses in the fiber web and at the same time. A pattern corresponding to the weave structure of the support is formed. Therefore, by using such an intercalated disc, it is possible to obtain a nonwoven fabric in which one entangled portion is unpatterned and the other has a pattern.

Alternatively, the conditions of the water flow confounding treatment can be made different from each other between the two sections by using two types of supports and the above intercalated discs. Specifically, first, the fiber web is placed on one of the supports, and the ladder-shaped intercalated disc is arranged between the web and the nozzle, and a water stream is sprayed onto the fiber web, for example, only in the first section. Form a pattern. Then, by placing the fiber web with the pattern formed in the first section on another support, and arranging the intercalated disc so that the opening of the intercalated disc is located in the second section, the water flow is sprayed. , A pattern corresponding to the woven structure of the other support is formed in the second section. Also by this method, the first entangled portion and the second entangled portion having different patterns can be formed.

In the present embodiment, the fiber web is subjected to a treatment for totally entwining its constituent fibers (total entanglement treatment) and then subjected to a water flow entanglement treatment such that different water flow entanglement treatment conditions are applied between the two sections. good. The whole entanglement treatment may be carried out under the same treatment conditions throughout the fiber web. Further, the whole entanglement treatment may be carried out so that the fiber web after the entanglement treatment has no pattern, that is, no pattern. By entwining the fibers to some extent in advance by the whole entanglement treatment, patterning becomes easier in the subsequent entanglement treatment.

The whole entanglement process is carried out by placing a fiber web on the support and injecting a columnar water stream. For example, the support is preferably a plain weave support having 80 mesh or more and 100 mesh or less. With such a support, it is possible to entangle the fibers of the fiber web so as to have a good texture without forming a pattern on the fiber web.

The fiber web can be made by a known method. The form of the fiber web may be any one selected from, for example, a card web such as a parallel web, a cross web, a semi-random web and a random web, an air array web, a wet papermaking web and the like. In the present embodiment, the card web is preferably used because it is easy to obtain the thickness and it is easy to make unevenness.

For the entire entanglement process, the water flow with a water pressure of 1 MPa or more and 15 MPa or less is applied to the surface of the fiber web from nozzles provided with orifices with a hole diameter of 0.05 mm or more and 0.5 mm or less at intervals of 0.3 mm or more and 1.5 mm or less. This may be carried out by injecting the back surface 1 to 5 times each. The water pressure is preferably 1 MPa or more and 10 MPa or less, and more preferably 1 MPa or more and 7 MPa or less.

The entanglement treatment for the first and second sections (hereinafter referred to as "section entanglement treatment") is performed from nozzles provided with orifices having a hole diameter of 0.05 mm or more and 0.5 mm or less at intervals of 0.3 mm or more and 1.5 mm or less. , The water pressure of 1 MPa or more and 15 MPa or less may be sprayed on the front and back surfaces of the fiber web 1 to 5 times each. The water pressure is preferably 1 MPa or more and 10 MPa or less, and more preferably 1 MPa or more and 7 MPa or less. In the present embodiment, when the total entanglement process is not performed and only the section entanglement process is performed, a higher water pressure than when the total entanglement process is performed is set so that the desired entanglement state is achieved. You can do it. Further, in the present embodiment, when the section entanglement treatment is performed twice using two types of supports, the water pressure of the water flow injected into each section may be within the above range.

The nonwoven fabric of Embodiment 1 can be obtained by forming the first entanglement portion and the second entanglement portion by subjecting the first section and the second section to a water flow entanglement treatment and then subjecting the fiber web to a drying treatment. ..

When the fiber web contains adhesive fibers, an adhesive treatment may be performed at the same time as the drying treatment or after the drying treatment so that the resulting nonwoven fabric has a structure in which the fibers are bonded to each other. The bonding treatment may be a thermal bonding treatment, or may be bonding by electron beam irradiation or ultrasonic welding. According to the heat treatment, the adhesive fibers (for example, the low melting point component of the composite fiber) can be melted or softened by heating during the heat treatment to bond the fibers constituting the fiber web to each other. According to the heat treatment, the drying treatment can be carried out at the same time.

The heat treatment is, for example, a hot air processing treatment in which hot air is blown, a hot roll processing (heat embossing roll processing), or a heat treatment using infrared rays. The hot air processing may be performed using a device that blows hot air at a predetermined temperature onto the fiber web, for example, a hot air penetration type heat treatment machine or a hot air blowing type heat treatment machine.

The heat treatment temperature (for example, the temperature of hot air) may be a temperature at which the components constituting the adhesive fibers and functioning as the adhesive components soften or melt. For example, the heat treatment temperature may be a temperature equal to or higher than the melting point of the component. For example, when the adhesive fiber contains polyethylene as a component and polyethylene is an adhesive component, the heat treatment temperature may be set to 130 ° C to 150 ° C.

The above exemplifies a striped pattern forming support in which two different woven structures are regularly and repeatedly formed in the MD direction. In a modification of the present embodiment, three or more different woven structures (eg, woven structures A, B, C) are present in the MD direction, for example, ABC-, or ABAC-. A support formed repeatedly in the order of the above may be used. When this support is used, a nonwoven fabric in which a third entanglement portion is formed corresponding to the woven structure C can be obtained. Further, in order to form three types of confounding parts, for example, three types of supports are used, and the intercalated disc is shaped so that the water flow is sprayed only to the portion corresponding to one of the three sections. The water flow confounding treatment may be carried out by the method described above.

(Embodiment 3: Use of non-woven fabric of Embodiment 1)
As the third embodiment, a product using the nonwoven fabric of the first embodiment will be described.
The nonwoven fabric of Embodiment 1 may be used as a wiper alone or in combination with other nonwoven fabrics or sheet-like materials. In the nonwoven fabric of the first embodiment, the tensile strength S1 in the extending direction of each striped portion constituting the striped pattern is smaller than the tensile strength S2 in the direction orthogonal to the extending direction of each striped portion constituting the striped pattern. .. Therefore, even if this non-woven fabric is placed on a dirty object and reciprocated in a direction orthogonal to the direction in which the first and second entangled portions corresponding to the strips extend, the object is less likely to be twisted. , Dirt on the object can be effectively wiped off by the striped pattern.

In the nonwoven fabric of the first embodiment, when the gradation change rate at the time of wiping is measured by the following method, the gradation change rate T1 at the time of wiping in the direction in which the first entanglement portion extends and the direction in which the first entanglement portion extends The gradation change rate T2 at the time of wiping in the orthogonal direction may satisfy T2 / T1> 1.0.
(Measurement method of gradation change rate at the time of wiping)
A transparent acrylic plate (thickness 3 mm, product number: KAC9143-1S, manufactured by Hikari Co., Ltd.) with a mark (a square frame with a side of 1.5 cm drawn with a pen) opposite to the side with the mark. Pseudo-stain (blue acrylic paint (brand name: acrylic paint (blue), manufactured by Daiso Sangyo Co., Ltd.), ethanol (brand name: Wako first-class ethanol (99.5), manufactured by Fujifilm Wako Junyaku Co., Ltd.) and distilled water. 3 drops (0.05 ml per drop) of the mixture (blue acrylic paint: ethanol: distilled water = 10: 50: 40 (mass ratio)) was dropped and spread evenly over the area marked above 60. After air-drying for a minute, the gray scale gradation A in the innai (not including the square frame drawn with the pen) after air-drying is obtained. Image analysis processing software (software name: Image J) is used for gradation measurement. Place another acrylic plate on the side to which the pseudo-stain is applied to protect the stain, and capture the image data with a scanner (trade name: Docu Center VIIC4473, manufactured by Fuji Xerox Co., Ltd.). The captured image data is divided into RGB channels (Split Channels), and the average value of the gradations in the markings is confirmed by a histogram (Histogram) for only the Red component, and this is referred to as grayscale gradation A.

A plate-shaped jig (wiping area 6 cm x 6 cm) is applied with a non-woven fabric (100 parts by mass of non-woven fabric impregnated with 300 parts by mass of distilled water) of 10 cm in the MD direction and 6 cm in the CD direction, which is a sample of the pseudo-dirt applied to the acrylic plate. ), While applying a pressure of 510 Pa, reciprocate twice in a predetermined direction at a speed of 10 mm / sec and a moving distance of 100 mm, and the grayscale gradation B of pseudo-dirt remaining on the acrylic plate after wiping is the same as gradation A. The gradation change rate T (%) is calculated according to the following formula.

T1 and T2 may satisfy T2 / T1 ≧ 1.05, more particularly T2 / T1 ≧ 1.10. Further, the upper limit value of T2 / T1 may be, for example, 3.0, particularly 2.5, and more particularly 2.0.

Satisfying T2 / T1> 1.0 means that the direction orthogonal to the extending direction of the first entanglement portion is the wiping direction as compared with the wiping property when the extending direction of the first entanglement portion is the wiping direction. It means that it has a high wiping property. Therefore, when the extending direction of the first entanglement portion is the CD direction of the non-woven fabric, the wiping property when the MD direction is the wiping direction is higher than the wiping property when the CD direction is the wiping direction. .. Such wiping property cannot be obtained with the conventional non-woven fabric having a striped pattern in which each line portion extends in the MD direction.

When the non-woven fabric of the first embodiment satisfies T2 / T1> 1.0 and is used as a wiper, the user can easily recognize the wiping direction having a higher wiping effect. That is, if the relationship between the striped pattern and the preferable moving direction of the wiper is described in the package or the like, the user can move the wiper in combination with the fact that a clear striped pattern is formed on the wiper itself. You can wipe in the correct direction without making a mistake.

Alternatively, the nonwoven fabric of the present embodiment may be used for sanitary products such as menstrual napkins, baby diapers, and adult diapers. As described above, the non-woven fabric of the present embodiment has a peculiar water absorption property, and the non-woven fabric of the present embodiment does not easily diffuse the absorbed liquid. Therefore, the nonwoven fabric of the present embodiment may be used as a member, particularly a surface material, which is required to suppress the spread of blood and excrement in sanitary products. Alternatively, the nonwoven fabric of the present embodiment may be used for hand towels, face masks, sanitary masks, filters, poultices and the like.

Hereinafter, this embodiment will be described with reference to Examples.
The following fibers were prepared as the fibers used in the examples and comparative examples.
Rayon (cellulosic fiber): Viscose rayon fiber with a fineness of 1.7 dtex and a fiber length of 40 mm (Corona CD (trade name) manufactured by Daiwa Bow Rayon Co., Ltd.).
PET: A single fiber made of polyethylene terephthalate having a fineness of 1.45 dtex and a fiber length of 38 mm (trade name: Tetron T403, manufactured by Toray Industries, Inc.).
PP / PE: Polypropylene is the core, high-density polyethylene (melting point: about 133 ° C) is the sheath, the composite ratio (core: sheath) is 37:63 (volume ratio), the fineness is 1.7 dtex, and the fiber length is 51 mm. Concentric sheath type composite fiber (NBF (H) (trade name) manufactured by Daiwa Spinning Co., Ltd.).

The supports used in the second water flow entanglement treatment in the production of the nonwoven fabrics of Examples and Comparative Examples are shown below.
Support 1: Warp wire diameters are 0.81 mm and 0.41 mm (two types of filaments are arranged alternately), weft wire diameter is 0.72 mm, warp density is 25 / inch, and weft density is 17 / inch. , Textile weave
Support 2: The diameter of the warp is 0.7 mm, the diameter of the weft is 0.9 mm, and the density of the warp is
41 threads / inch, weft density 16 threads / inch, texture 3/1 Sugi Aya woven fabric
Support 3: Warp wire diameters are 0.88 mm and 0.57 mm (two types of filaments are arranged alternately), weft wire diameters are 0.45 mm (plain weave part) and 0.9 mm (plain weave part), and warp yarn density is 30. / Inch, the density of wefts is 17 lines / inch, the structure is plain weave and 2/2 twill alternate in the MD direction, the dimension of one plain weave part in the MD direction is 24 mm, and one 2/2 twill Fabric support 4: warp wire diameters 0.88 mm and 0.57 mm (two types of filaments are arranged alternately), weave wire diameters 0.45 mm (plain weave part) and 0.8 mm (Twill weave part), the density of warps is 30 / inch, the density of wefts is 25 / inch, the structure is plain weave and 1/7 twill alternate in the MD direction, and the dimensions of one plain weave part in the MD direction are A fabric that is 24 mm and has a dimension of 1/7 twill in the MD direction of 11 mm.

(Test 1)
<Manufacturing of non-woven fabric 1-A: Comparative example>
80% by mass of rayon and 20% by mass of PP / PE were mixed and a fiber web was manufactured using a parallel card machine. The basis weight of this fiber web was about 40 g / m ² .
[1st water flow confounding process (whole confounding process)]
The above-mentioned fiber web was placed on a plain weave net having a warp wire diameter of 0.132 mm, a warp and weft wire diameter of 0.132 mm, and a mesh number of 90 mesh. While advancing the fiber web at a speed of 4 m / min, a columnar water stream having a water pressure of 1.0 MPa was sprayed onto the surface of the fiber web, and then a columnar water stream having a water pressure of 1.5 MPa was sprayed onto the back surface of the fiber web. For the water flow injection, a nozzle provided with orifices having a hole diameter of 0.12 mm at intervals of 0.6 mm was used. The distance between the surface of the fiber web and the orifice was 15 mm.

[Second water flow confounding treatment]
The fiber web after being subjected to the first water flow entanglement treatment was placed on the support 1, and a columnar water stream having a water pressure of 1.5 MPa was sprayed onto the back surface of the fiber web while advancing the fiber web at a speed of 4 m / min. For the injection of the water flow, the same nozzle as the nozzle used in the first water flow confounding treatment was used. By the second water flow entanglement treatment, a pattern in which the openings were regularly arranged in a staggered pattern was formed over the entire non-woven fabric. The area per opening was 0.4 mm ² , the shortest distance between the centers of adjacent openings was 1.8 mm, and the ratio of the openings to the surface of the non-woven fabric was 13%.

[Heat treatment]
The non-woven fabric after the second water flow entanglement treatment is heated at 135 ° C. for about 5 seconds using a hot air penetrating heat treatment machine to perform a drying treatment, and at the same time, the fibers are heat-bonded to each other by the sheath component of PP / PE to be a non-woven fabric. 1-A was obtained.

<Manufacturing of non-woven fabric 1-B: Comparative example>
Nonwoven fabric 1-B was obtained by the same procedure as that used in the production of nonwoven fabric 1-A, except that the support 2 was used in the second water flow entanglement treatment.
A cedar pattern was formed on the entire surface of the non-woven fabric 1-B.

<Manufacturing of Nonwoven Fabric 1-C: Example>
Nonwoven fabric 1-C is obtained by the same procedure as that used in the production of nonwoven fabric 1-A, except that the support 3 is used in the second water flow entanglement treatment and the second water flow entanglement treatment is performed as the section entanglement treatment. rice field.
In the non-woven fabric 1-C, a diagonal line pattern portion as a first entanglement portion extending along the CD direction of the non-woven fabric and a pattern portion in which openings are arranged in a staggered pattern as a second entanglement portion are alternately repeated in the MD direction. It was present and formed a striped pattern. The dimension of the first entangled portion (hatched pattern portion) in the MD direction was 24 mm, and the dimension of the second entangled portion (opened pattern portion) in the MD direction was 11 mm. The acute angle between the diagonal line of the first confounding part and the CD direction was 57 degrees. In the second entanglement, the area per opening is 0.04 mm ² , the shortest distance between the centers of adjacent openings is 1.5 mm, and the ratio of the opening to the second entanglement is 1.6. %Met.

<Manufacturing of non-woven fabric 1-D: comparative example>
Nonwoven fabric 1-D was obtained by the same procedure as that used in the production of nonwoven fabric 1-A, except that the second water flow entanglement treatment was carried out by the following procedure.
[Water flow confounding step 2]
The fiber web after being subjected to the first water flow entanglement treatment was placed on the support 1, and a columnar water stream having a water pressure of 1.5 MPa was sprayed on the back surface of the fiber web while advancing the fiber web at a speed of 4 m / min. For the injection of the water flow, the same nozzle as the nozzle used in the first water flow confounding treatment was used, but a nozzle was used in which a part of the orifice was blocked so that the water flow was not injected from the orifice. Specifically, the portion P1 that blocks the orifice and the portion P2 that does not block the orifice have lengths of 10 mm (P1) and 20 mm (P2) in the CD direction, respectively, and P1 and P2 alternate in the CD direction. Part of the orifice was closed so that it could be provided in. By using this nozzle, the fiber web has a pattern portion in which openings extending along the MD direction are regularly arranged and a plain portion extending along the MD direction alternately along the CD direction. Been formed.

Subsequently, the fiber web was placed on the support 2, and while the fiber web was advanced at a speed of 4 m / min, a columnar water stream having a water pressure of 1.5 MPa was sprayed onto the back surface of the fiber web to obtain a nonwoven fabric. For the injection of the water flow, the same nozzle as the nozzle used in the first water flow confounding treatment was used, but a nozzle was used in which a part of the orifice was blocked so that the water flow was not injected from the orifice. Specifically, the portion Q1 that blocks the orifice and the portion Q2 that does not block the orifice have lengths of 20 mm (Q1) and 10 mm (Q2) in the CD direction, respectively, and Q1 and Q2 alternate in the CD direction. Part of the orifice was closed so that it could be provided in. Using this nozzle, the water flow was made to hit the previously formed plain part.

By performing the second water flow entanglement treatment in the above procedure, the nonwoven fabric 1-D has a diagonal pattern portion extending along the MD direction of the nonwoven fabric and a pattern portion in which openings are regularly arranged in a staggered pattern (a pattern portion). (Opened pattern portions) were formed alternately along the CD direction. The dimension of the diagonal line pattern portion in the CD direction was 10 mm, and the dimension of the perforated pattern portion in the CD direction was 20 mm. In the opening pattern, the area per opening is 0.4mm ² , the shortest distance between the centers of adjacent openings is 1.8mm, and the ratio of the opening to the opening pattern is 13%. there were.

<Manufacturing of Nonwoven Fabric 1-E: Example>
Nonwoven fabric 1-E is obtained by the same procedure as that used in the production of nonwoven fabric 1-A, except that the support 4 is used in the second water flow entanglement treatment and the second water flow entanglement treatment is performed as the section entanglement treatment. rice field.
In the non-woven fabric 1-E, a diagonal line pattern portion as a first entanglement portion extending along the CD direction of the non-woven fabric and a pattern portion in which openings are arranged in a staggered pattern as a second entanglement portion are alternately repeated in the MD direction. It was present and formed a striped pattern. The dimension of the first entangled portion (hatched pattern portion) in the MD direction was 14 mm, and the dimension of the second entangled portion (opened pattern portion) in the MD direction was 9 mm. The acute angle formed by the diagonal line of the first confounding portion and the CD direction was 17 degrees. In the second entanglement, the area per opening is 0.04 mm ² , the shortest distance between the centers of adjacent openings is 1.5 mm, and the ratio of the opening to the second entanglement is 1.1. %Met.

(Test 2)
Nonwoven fabrics 1-A to 1-D produced in Test 1 except that a fiber web was produced by mixing 40% by mass of rayon, 40% by mass of PET, and 20% by mass of PP / PE using a parallel card machine. Nonwoven fabrics 2-A to 2-D were obtained by the same procedure as that adopted in the production of the above.

(Test 3)
The procedure adopted in the production of the nonwoven fabrics 1-A to 1-D produced in Test 1 except that the fiber web was produced by mixing 80% by mass of PET and 20% by mass of PP / PE using a parallel card machine. The non-woven fabrics 3-A to 3-D were obtained in the same procedure as above.

The wiping test (gradation change rate at the time of wiping), thickness, thickness coefficient of variation, water absorption characteristics, and run-off of each non-woven fabric produced in Tests 1 to 3 were evaluated by the following procedure. Further, among the nonwoven fabrics produced in Tests 1 to 3, the nonwoven fabrics 1-A to 1-D, the nonwoven fabrics 2-A to 2-D, and the nonwoven fabrics 3-A to 3-D have tensile strength, elongation, 10%, and the like. The 20% elongation stress was evaluated by the following procedure. The evaluation results are shown in Tables 1 and 2.

<Gradation change rate when wiping>
A transparent acrylic plate (thickness 3 mm, product number: KAC9143-1S, manufactured by Hikari Co., Ltd.) with a mark (a square frame with a side of 1.5 cm drawn with a pen) opposite to the side with the mark. Pseudo-stain (blue acrylic paint (brand name: acrylic paint (blue), manufactured by Daiso Sangyo Co., Ltd.), ethanol (brand name: Wako first-class ethanol (99.5), manufactured by Fujifilm Wako Junyaku Co., Ltd.) and distilled water. 3 drops (0.05 ml per drop) of the mixture (blue acrylic paint: ethanol: distilled water = 10: 50: 40 (mass ratio)) was dropped and spread evenly over the area marked above 60. After air-drying for a minute, the gray scale gradation A in the innai (not including the square frame drawn with the pen) after air-drying is obtained. Image analysis processing software (software name: Image J) is used for gradation measurement. Place another acrylic plate on the side to which the pseudo-stain is applied to protect the stain, and capture the image data with a scanner (trade name: Docu Center VIIC4473, manufactured by Fuji Xerox Co., Ltd.). The captured image data is divided into RGB channels (Split Channels), and the average value of the gradations in the markings is confirmed by a histogram (Histogram) for only the Red component, and this is referred to as grayscale gradation A.

A plate-shaped jig (wiping area 6 cm x 6 cm) is applied with a non-woven fabric (100 parts by mass of non-woven fabric impregnated with 300 parts by mass of distilled water) of 10 cm in the MD direction and 6 cm in the CD direction, which is a sample of the pseudo-dirt applied to the acrylic plate. ), While applying a pressure of 510 Pa, reciprocate twice in a predetermined direction at a speed of 10 mm / sec and a moving distance of 100 mm, and the grayscale gradation B of pseudo-dirt remaining on the acrylic plate after wiping is the same as gradation A. The gradation change rate T (%) is calculated according to the following formula.

<Thickness, coefficient of variation of thickness>
<Measurement method of thickness with a microscope>
The non-woven fabric is cut with a sharp blade so that a rectangular sample with each side parallel to the MD direction or the CD direction can be obtained. The cut non-woven fabric is placed on a smooth table, a load of 40 Pa is applied, and a microscope is applied from the side of the cut surface obtained by cutting in the direction perpendicular to the MD direction. Measure the distance (thickness) in. The measurement is carried out at 6 points, and this average value is taken as the average value of the thickness in the MD direction. Similarly, a microscope is applied from the side of the cut surface obtained by cutting in the direction perpendicular to the CD direction, and the distance (thickness) in the thickness direction is measured at the portion where the fiber is present. The measurement is carried out at 6 points, and this average value is taken as the average value of the thickness in the CD direction. For non-woven fabrics in which a plurality of entangled parts are arranged in a striped pattern, cutting in a direction parallel to the direction in which the streaks extend is performed only at one of the entangled parts, and the thickness at the cut surface of the entangled part is thick. To measure.

When only one confounding part is seen on the cut surface (when the cut surface consists of one confounding part), the standard deviation σ is calculated from the data obtained by measuring the thickness of 6 points, and the coefficient of variation is calculated from the following formula. calculate. If multiple types of entanglements are found on the cut surface (when the cut surface consists of multiple entanglements), measure the thickness of 6 points at each entanglement and measure the thickness of 6 points (6 x type of entanglement). The standard deviation is calculated from the measured data, and the coefficient of variation is calculated from the following formula.
Coefficient of variation of thickness = standard deviation σ / mean value of thickness

<Water absorption (Bilek method)>
The water absorption was measured by the Bilek method according to JIS L 1907 7.1.2., And the numerical values in the MD direction and the CD direction were measured. In each direction, four non-woven fabric sample pieces were used, and the immersion time in water was 5 minutes.
Further, when the water absorption in the MD direction was A (mm) and the water absorption in the CD direction was B (mm), the area (mm ² ) of the pseudo-diffusion ellipse measured by A × B × π was calculated.

<Tensile strength, elongation rate, 10% elongation stress, 20% elongation stress>
According to JIS L 1913: 2010 6.3, a sample piece is subjected to a tensile test under the conditions of a width of 50 mm, a grip interval of 10 cm, and a tensile speed of 30 ± 2 cm / min using a constant-speed tension type tensile tester, and then cut. The load value (tensile strength), elongation rate, and 10% and 20% elongation stress at the time were measured. The tensile test was carried out with the longitudinal direction (MD direction) and the transverse direction (CD direction) of the nonwoven fabric as the tensile direction. The evaluation results are all shown by averaging the values measured for the three samples.

In each of the non-woven fabrics 1-C, 2-C and 3-C, the first entanglement portion and the second entanglement portion extend in the CD direction, and the first entanglement portion and the second entanglement portion are alternately arranged in the MD direction. It has a striped pattern. As shown in Table 2, these non-woven fabrics satisfy the relationship of tensile strength in the CD direction <strength in the MD direction. All of these non-woven fabrics had a higher coefficient of variation in thickness in the CD direction than the other non-woven fabrics produced in the same test. Further, in these non-woven fabrics, a relatively high gradation change rate (wiping property) is shown in the MD direction, and the gradation change rate T2 in the MD direction / gradation change rate T1 in the CD direction is 1.0 or more. Met. The gradation change rate of the non-woven fabric 1-E was also the same. This indicates that the nonwoven fabric having the first entanglement portion and the second entanglement portion extending in the CD direction exhibits high wiping property when moved in the direction orthogonal to the CD direction.

In addition, the nonwoven fabrics 1-C and 1-E had smaller water absorption in the MD and CD directions and a smaller pseudo-diffusion elliptical area than the nonwoven fabrics 1-A and 1-B.

None of the other nonwoven fabrics (comparative examples) produced in Tests 1 and 3 have a striped pattern in which the strips extending in the CD direction are repeatedly arranged along the MD direction. Therefore, the other non-woven fabrics have a smaller wiping property in the MD direction than the non-woven fabric of the example, or have a very low wiping property in the CD direction although they do not have a large difference as compared with the examples. Met. In particular, in the striped non-woven fabrics 1-D, 2-D and 3-D in which the streaks are repeatedly arranged in the CD direction, the wiping property in the CD direction is higher than the wiping property in the MD direction, and the wiping property in the MD direction is higher. The gradation change rate T2 / the gradation change rate T1 in the CD direction was less than 1. Therefore, when the non-woven fabric of the comparative example is not fixed to the tool, for example, it is held by a human hand and moved in the direction of the CD to wipe it off, the non-woven fabric is broken and it tends to be difficult to wipe off the dirt.

（態様９）
前記不織布の質量を１００質量％としたときに、前記不織布がセルロース系繊維を３０質量％以上含む、態様１～８のいずれかの不織布。
（態様１０）
前記不織布の目付が３０ｇ／ｍ^２以上８０ｇ／ｍ^２以下である、態様１～９のいずれかの不織布。
（態様１１）
態様１～１０のいずれかの不織布を含むワイパー。
（態様１２）
繊維ウェブを作製すること、
前記繊維ウェブを支持体に載置して、前記繊維ウェブに高圧流体流による交絡処理を施すこと
を含み、
前記交絡処理において、前記繊維ウェブに、ＣＤ方向に沿って延びる第１セクションおよび第２セクションが縞状に存在するものと仮想し、
前記繊維ウェブの第１セクションが交絡処理に付されるときの処理条件と、前記繊維ウェブの第２セクションが交絡処理に付されるときの処理条件とを互いに異なるものとして、交絡処理後の第１セクションである第１交絡部と交絡処理後の第２セクションである第２交絡部とが互いに異なる模様を有するか、あるいは交絡処理後の第１セクションである第１交絡部および交絡後の第２セクションである第２交絡部のいずれか一方が無模様となり、他方が模様を有するように、前記交絡処理を実施する、
不織布の製造方法。
（態様１３）
前記繊維ウェブの第１セクションの交絡処理と、前記繊維ウェブの第２セクションの交絡処理とが、繊維ウェブを一つの支持体に載置して同時に行われる、態様１２の不織布の製造方法。
（態様１４）
前記交絡処理で用いられる支持体が、ＭＤ方向に沿って二種類の織組織が規則的に繰り返し形成されているものである、態様１３の不織布の製造方法。
（態様１５）
前記交絡処理で用いられる支持体が、平織部と綾織部とがＭＤ方向に沿って交互に繰り返し形成されているものである、態様１４の不織布の製造方法。
（態様１６）
前記交絡処理を行う前に、前記繊維ウェブの全体にわたって同じ処理条件にて高圧流体流による交絡処理を施す全体交絡処理を含む、態様１２～１５のいずれかの不織布の製造方法。 The present embodiment includes the following embodiments.
(Aspect 1)
A non-woven fabric containing a first entangled portion and a second entangled portion.
The first entangled portion and the second entangled portion exist in a striped pattern.
The second entangled portion and the first entangled portion have different patterns from each other, or one of the second entangled portion and the first entangled portion is unpatterned and the other has a pattern.
The tensile strength S1 of the nonwoven fabric in the direction in which the first entangled portion extends and the tensile strength S2 of the nonwoven fabric in the direction orthogonal to the direction in which the first entangled portion extends satisfy S1 <S2.
Non-woven fabric.
(Aspect 2)
The nonwoven fabric of aspect 1, wherein the dimension of the first entanglement portion is 2 mm or more and 200 mm or less in a direction orthogonal to the direction in which the first entanglement portion extends.
(Aspect 3)
The nonwoven fabric of aspect 1 or 2, wherein the dimension of the second entanglement portion is 2 mm or more and 200 mm or less in a direction orthogonal to the direction in which the second entanglement portion extends.
(Aspect 4)
The first entangled portion has a pattern, and the pattern of the first entangled portion is a diagonal line pattern.
The acute angle formed by the diagonal line of the diagonal line pattern and the direction in which the first entanglement portion extends is 10 degrees or more and 80 degrees or less.
A non-woven fabric according to any one of aspects 1 to 3.
(Aspect 5)
The nonwoven fabric according to any one of aspects 1 to 4, wherein the second entanglement portion has a pattern, and the pattern of the second entanglement portion is an opening pattern in which openings are regularly arranged.
(Aspect 6)
The nonwoven fabric of aspect 5 in which the area of one opening in the opening pattern is 0.50 mm ² or less.
(Aspect 7)
The nonwoven fabric according to any one of aspects 1 to 6, wherein the coefficient of variation of the thickness of the cut surface orthogonal to the CD direction of the nonwoven fabric is 0.09 or more.
(Aspect 8)
When measuring the gradation change rate at the time of wiping by the following method, the gradation change rate T1 at the time of wiping the non-woven fabric in the CD direction and the gradation change rate T2 at the time of wiping the non-woven fabric in the MD direction are T2 / T1. The nonwoven fabric according to any one of aspects 1 to 7, satisfying> 1.0.
(Measurement method of gradation change rate at the time of wiping)
A transparent acrylic plate (thickness 3 mm, product number: KAC9143-1S, manufactured by Hikari Co., Ltd.) with a mark (a square frame with a side of 1.5 cm drawn with a pen) opposite to the side with the mark. Pseudo-stain (blue acrylic paint (brand name: acrylic paint (blue), manufactured by Daiso Sangyo Co., Ltd.), ethanol (brand name: Wako first-class ethanol (99.5), manufactured by Fujifilm Wako Junyaku Co., Ltd.) and distilled water. 3 drops (0.05 ml per drop) of the mixture (blue acrylic paint: ethanol: distilled water = 10: 50: 40 (mass ratio)) was dropped and spread evenly over the area marked above 60. After air-drying for a minute, the gray scale gradation A in the innai (not including the square frame drawn with the pen) after air-drying is obtained. Image analysis processing software (software name: Image J) is used for gradation measurement. Place another acrylic plate on the side to which the pseudo-stain is applied to protect the stain, and capture the image data with a scanner (trade name: Docu Center VIIC4473, manufactured by Fuji Xerox Co., Ltd.). The captured image data is divided into RGB channels (Split Channels), and the average value of the gradations in the markings is confirmed by a histogram (Histogram) for only the Red component, and this is referred to as grayscale gradation A.
A plate-shaped jig (wiping area 6 cm x 6 cm) is applied with a non-woven fabric (100 parts by mass of non-woven fabric impregnated with 300 parts by mass of distilled water) of 10 cm in the MD direction and 6 cm in the CD direction, which is a sample of the pseudo-dirt applied to the acrylic plate. ), While applying a pressure of 510 Pa, reciprocate twice in a predetermined direction at a speed of 10 mm / sec and a moving distance of 100 mm, and the grayscale gradation B of pseudo-dirt remaining on the acrylic plate after wiping is the same as gradation A. The gradation change rate T (%) is calculated according to the following formula.

(Aspect 9)
The nonwoven fabric according to any one of aspects 1 to 8, wherein the nonwoven fabric contains 30% by mass or more of cellulosic fibers when the mass of the nonwoven fabric is 100% by mass.
(Aspect 10)
The nonwoven fabric according to any one of aspects 1 to 9, wherein the nonwoven fabric has a basis weight of 30 g / m ² or more and 80 g / m ² or less.
(Aspect 11)
A wiper containing the nonwoven fabric according to any one of aspects 1 to 10.
(Aspect 12)
Making a textile web,
Including placing the fiber web on a support and subjecting the fiber web to entanglement with a high pressure fluid flow.
In the entanglement process, it is assumed that the first section and the second section extending along the CD direction are present in a striped pattern on the fiber web.
The treatment conditions when the first section of the fiber web is subjected to the entanglement treatment and the treatment conditions when the second section of the fiber web is subjected to the entanglement treatment are different from each other, and the first section after the entanglement treatment is performed. The first entangled portion, which is one section, and the second entangled portion, which is the second section after entanglement processing, have different patterns from each other, or the first entanglement portion, which is the first section after entanglement processing, and the first after entanglement. The entanglement process is performed so that one of the two sections of the second entanglement portion has no pattern and the other has a pattern.
Manufacturing method of non-woven fabric.
(Aspect 13)
The method for producing a nonwoven fabric according to aspect 12, wherein the entanglement treatment of the first section of the fiber web and the entanglement treatment of the second section of the fiber web are performed simultaneously by placing the fiber web on one support.
(Aspect 14)
The method for producing a nonwoven fabric according to aspect 13, wherein the support used in the entanglement treatment is one in which two types of woven structures are regularly and repeatedly formed along the MD direction.
(Aspect 15)
The method for producing a nonwoven fabric according to aspect 14, wherein the support used in the entanglement treatment is formed in which a plain weave portion and a twill weave portion are alternately and repeatedly formed along the MD direction.
(Aspect 16)
The method for producing a nonwoven fabric according to any one of embodiments 12 to 15, comprising a total entanglement treatment in which a high-pressure fluid flow entanglement treatment is performed over the entire fiber web under the same treatment conditions before the entanglement treatment is performed.

In the non-woven fabric of the present disclosure, each streak portion constituting the striped pattern extends in a direction orthogonal to the direction in which the tensile strength is larger, and each striation portion of the striped pattern extends on the surface of the object. Even if it is reciprocated in a direction orthogonal to the direction, twisting is unlikely to occur. Further, the striped pattern includes at least a first entangled portion and a second entangled portion having different patterns from each other or one having no pattern and the other having a pattern. Therefore, the non-woven fabrics of the present disclosure are suitable for use as sanitary products such as wipers, menstrual napkins, baby diapers, adult disposable diapers, hand towels, face masks, sanitary masks, filters, poultices and the like.

Claims (16)

A non-woven fabric containing a first entangled portion and a second entangled portion.
The first entangled portion and the second entangled portion exist in a striped pattern.
The second entangled portion and the first entangled portion have different patterns from each other, or one of the second entangled portion and the first entangled portion is unpatterned and the other has a pattern.
The tensile strength S1 of the nonwoven fabric in the direction in which the first entangled portion extends and the tensile strength S2 of the nonwoven fabric in the direction orthogonal to the direction in which the first entangled portion extends satisfy S1 <S2.
Non-woven fabric. The nonwoven fabric according to claim 1, wherein the dimension of the first entangled portion in a direction orthogonal to the extending direction of the first entangled portion is 2 mm or more and 200 mm or less. The nonwoven fabric according to claim 1 or 2, wherein the dimension of the second entanglement portion in a direction orthogonal to the extending direction of the second entanglement portion is 2 mm or more and 200 mm or less. The first entangled portion has a pattern, and the pattern of the first entangled portion is a diagonal line pattern.
The acute angle formed by the diagonal line of the diagonal line pattern and the direction in which the first entanglement portion extends is 10 degrees or more and 80 degrees or less.
The nonwoven fabric according to any one of claims 1 to 3. The nonwoven fabric according to any one of claims 1 to 4, wherein the second entanglement portion has a pattern, and the pattern of the second entanglement portion is an opening pattern in which openings are regularly arranged. The nonwoven fabric according to claim 5, wherein the area of one opening in the opening pattern is 0.50 mm ² or less. The nonwoven fabric according to any one of claims 1 to 6, wherein the coefficient of variation of the thickness of the cut surface orthogonal to the CD direction of the nonwoven fabric is 0.09 or more. When measuring the gradation change rate at the time of wiping by the following method, the gradation change rate T1 at the time of wiping the non-woven fabric in the CD direction and the gradation change rate T2 at the time of wiping the non-woven fabric in the MD direction are T2 / T1. The nonwoven fabric according to any one of claims 1 to 7, which satisfies> 1.0.
(Measurement method of gradation change rate at the time of wiping)
A transparent acrylic plate (thickness 3 mm, product number: KAC9143-1S, manufactured by Hikari Co., Ltd.) with a mark (a square frame with a side of 1.5 cm drawn with a pen) opposite to the side with the mark. Pseudo-stain (blue acrylic paint (brand name: acrylic paint (blue), manufactured by Daiso Sangyo Co., Ltd.), ethanol (brand name: Wako first-class ethanol (99.5), manufactured by Fujifilm Wako Junyaku Co., Ltd.) and distilled water. 3 drops (0.05 ml per drop) of the mixture (blue acrylic paint: ethanol: distilled water = 10: 50: 40 (mass ratio)) was dropped and spread evenly over the area marked above 60. After air-drying for a minute, the gray scale gradation A in the innai (not including the square frame drawn with the pen) after air-drying is obtained. Image analysis processing software (software name: Image J) is used for gradation measurement. Place another acrylic plate on the side to which the pseudo-stain is applied to protect the stain, and capture the image data with a scanner (trade name: Docu Center VIIC4473, manufactured by Fuji Xerox Co., Ltd.). The captured image data is divided into RGB channels (Split Channels), and the average value of the gradations in the markings is confirmed by a histogram (Histogram) for only the Red component, and this is referred to as grayscale gradation A.
A plate-shaped jig (wiping area 6 cm x 6 cm) is applied with a non-woven fabric (100 parts by mass of non-woven fabric impregnated with 300 parts by mass of distilled water) of 10 cm in the MD direction and 6 cm in the CD direction, which is a sample of the pseudo-dirt applied to the acrylic plate. ), While applying a pressure of 510 Pa, reciprocate twice in a predetermined direction at a speed of 10 mm / sec and a moving distance of 100 mm, and the grayscale gradation B of pseudo-dirt remaining on the acrylic plate after wiping is the same as gradation A. The gradation change rate T (%) is calculated according to the following formula.

The nonwoven fabric according to any one of claims 1 to 8, wherein the nonwoven fabric contains 30% by mass or more of cellulosic fibers when the mass of the nonwoven fabric is 100% by mass. The nonwoven fabric according to any one of claims 1 to 9, wherein the nonwoven fabric has a basis weight of 30 g / m ² or more and 80 g / m ² or less. A wiper containing the nonwoven fabric according to any one of claims 1 to 10. Making a textile web,
Including placing the fiber web on a support and subjecting the fiber web to entanglement with a high pressure fluid flow.
In the entanglement process, it is assumed that the first section and the second section extending along the CD direction are present in a striped pattern on the fiber web.
The treatment conditions when the first section of the fiber web is subjected to the entanglement treatment and the treatment conditions when the second section of the fiber web is subjected to the entanglement treatment are different from each other, and the first section after the entanglement treatment is performed. The first entangled portion, which is one section, and the second entangled portion, which is the second section after entanglement processing, have different patterns from each other, or the first entanglement portion, which is the first section after entanglement processing, and the first after entanglement. The entanglement process is performed so that one of the two sections of the second entanglement portion has no pattern and the other has a pattern.
Manufacturing method of non-woven fabric. The nonwoven fabric according to claim 12, wherein the entanglement treatment of the first section of the fiber web and the entanglement treatment of the second section of the fiber web are performed simultaneously by placing the fiber web on one support. Production method. The method for producing a nonwoven fabric according to claim 13, wherein the support used in the entanglement treatment is one in which two types of woven structures are regularly and repeatedly formed along the MD direction. The method for producing a nonwoven fabric according to claim 14, wherein the support used in the entanglement treatment is formed by repeatedly forming a plain weave portion and a twill weave portion alternately along the MD direction. The method for producing a nonwoven fabric according to any one of claims 12 to 15, further comprising an overall entanglement treatment in which an entanglement treatment with a high-pressure fluid flow is performed over the entire fiber web under the same treatment conditions before the entanglement treatment is performed.

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