WO2021205995A1 - 不織布 - Google Patents

不織布 Download PDF

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Publication number
WO2021205995A1
WO2021205995A1 PCT/JP2021/014236 JP2021014236W WO2021205995A1 WO 2021205995 A1 WO2021205995 A1 WO 2021205995A1 JP 2021014236 W JP2021014236 W JP 2021014236W WO 2021205995 A1 WO2021205995 A1 WO 2021205995A1
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WO
WIPO (PCT)
Prior art keywords
woven fabric
binder
fiber
fibers
surface side
Prior art date
Application number
PCT/JP2021/014236
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English (en)
French (fr)
Japanese (ja)
Inventor
吉彦 瀬戸
凡 張
Original Assignee
花王株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 花王株式会社 filed Critical 花王株式会社
Priority to CN202180009596.XA priority Critical patent/CN115003873B/zh
Publication of WO2021205995A1 publication Critical patent/WO2021205995A1/ja

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/58—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/74—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being orientated, e.g. in parallel (anisotropic fleeces)

Definitions

  • the present invention relates to a non-woven fabric.
  • Non-woven fabrics are used in various situations, and there are many products that use non-woven fabrics. Techniques for imparting various functions to this non-woven fabric have been developed.
  • Patent Document 1 describes that a resin-bonded non-woven fabric formed by impregnating or applying an adhesive is incorporated into an absorbent article from the viewpoint of enhancing the thickness recovery of the absorbent article such as a diaper.
  • the resin-bonded non-woven fabric is arranged as a member that does not come into contact with the skin of the absorbent article.
  • a thermal bond non-woven fabric containing an air-through non-woven fabric or the like is usually used from the viewpoint of enhancing the softness to the touch.
  • the air-through non-woven fabric is manufactured by blowing hot air onto the fiber web to fuse the fiber intersections, and can be bulky while suppressing the basis weight.
  • Patent Documents 2 to 4 describe a non-woven fabric in which a fiber web is formed into a non-woven fabric in advance to form a non-woven fabric to improve the amount of compression deformation, cushioning property, and the like.
  • the present invention provides a non-woven fabric having a binder and thermoplastic fibers and having fusion points between the fibers.
  • the non-woven fabric preferably has a fiber intersection where fibers having a thickness direction component intersect with other fibers at the center of the thickness of the non-woven fabric, and the binder is present at the fiber intersection.
  • the binder preferably meets the requirements of either or both of the following (1) and (2).
  • (1) In a plan view of the non-woven fabric the abundance area ratio of the binder per unit area is smaller than the fiber area ratio of the portion not covered by the binder.
  • the ratio of the mass of the binder to the mass of the non-woven fabric is 65 percentage points or more smaller than the ratio of the mass of fibers to the mass of the non-woven fabric.
  • FIG. 5 is a schematic view showing a part of an observation image used in a method for measuring the abundance of a binder on a fiber intersection on one of the front and back surfaces of the nonwoven fabric when viewed in a plan view, together with a reference circle.
  • (A) is a side view showing a position (line AA) of cutting a cross section A orthogonal to a fiber layer forming a non-woven fabric surface (flat surface) through the center of thickness in a non-woven fabric having a flat shape.
  • (B) is a side view showing a position (line BB) at which a cross section B is cut out, which passes through the central portion of the thickness and is orthogonal to the cross section A.
  • (A) is a position (A-) in which a cross section A orthogonal to the fiber layer that passes through the center of thickness and forms a non-woven fabric surface (the surface of the wall portion that connects the top of the convex portion and the bottom of the concave portion) is cut out in the non-woven fabric having a concave-convex shape.
  • It is a side view which showed (A line)
  • (B) is a side view which showed the position (BB line) which cuts out the cross section B which passes through the thickness center part and is orthogonal to the cross section A.
  • It is a schematic diagram which showed a part of the observation screen used in the method of measuring the vertical orientation degree of a non-woven fabric together with a square reference line.
  • FIG. 14 is a partial cross-sectional view taken along the line CC of the non-woven fabric shown in FIG.
  • FIG. 14 is a partial cross-sectional view taken along the line DD of the nonwoven fabric shown in FIG.
  • FIG. 7 is a partial cross-sectional view taken along the line EE of the nonwoven fabric shown in FIG.
  • FIG. 7 is a partial cross-sectional view taken along the line FF of the nonwoven fabric shown in FIG.
  • the description schematically shows the manufacturing process of the nonwoven fabric sample in Example 5, and (A) is a step of arranging a fiber web on the male support material and pushing the female support material into the male support material from the fiber web. It is explanatory drawing which shows, (B) is explanatory drawing which shows the process of forming a fiber web by abducting the first hot air from above of a support female material, (C) is an explanatory view which removes a support female material, and is shown. It is explanatory drawing which shows the process of blowing the 2nd hot air from the upper part of the shaped fiber web, and fusing the fibers together.
  • the present invention relates to a non-woven fabric having excellent texture and excellent thickness recovery.
  • the non-woven fabric of the present invention has excellent texture and thickness recovery.
  • the non-woven fabric of the present invention has a binder and a thermoplastic fiber, and has a fusion point between the fibers.
  • the fusion point is a portion where the fibers are bonded to each other at the contact points between the intersecting fibers without interposing the binder. More specifically, the fusion point is one in which the surface of the thermoplastic fiber is partially melted by heat treatment in the manufacturing process of the non-woven fabric, and the fibers are bonded to each other by the melting.
  • an air-through non-woven fabric is used as the non-woven fabric of the present invention.
  • the non-woven fabric of the present invention has fiber intersections where fibers having a thickness direction component of the non-woven fabric intersect with other fibers.
  • a binder is present at the fiber intersection.
  • the fiber intersection is a portion where two or more fibers intersect.
  • the binder present at the fiber intersection preferably covers the outer surface of the portion where the fibers intersect and overlap. Further, it is preferable that the binder exists at the fiber intersection but extends to the fiber surface other than the fiber intersection.
  • the binder is a resin component different from the constituent fibers of the non-woven fabric, and is fixed to the surface of the constituent fibers after being made into a non-woven fabric.
  • a binder can be sprayed onto one surface of the non-woven fabric by spraying or the like to fix the binder at the fiber intersection. It is preferable to spray the binder from the side opposite to the surface of the non-woven fabric that comes into contact with the skin from the viewpoint of suppressing a sticky feeling when the non-woven fabric comes into contact with the skin.
  • the spraying mass of the binder is preferably 5 g / m 2 or less per unit area of the non-woven fabric. Further, from the viewpoint of effectively exhibiting the action of the binder on the fiber intersections, the spraying mass of the binder is preferably 0.3 g / m 2 or more per unit area of the non-woven fabric.
  • the non-woven fabric of the present invention has one side and the other side. Further, in the present specification, the one surface side is also referred to as a first surface side, and may be referred to with reference numeral 1A. The opposite surface side is also referred to as a second surface side, and may be referred to with reference numeral 1B.
  • the opposite surface (second surface) side is the surface side (non-skin surface side) that does not touch the skin during use.
  • the above “one surface” and “opposite surface” are the front and back surfaces of the non-woven fabric, and when the non-woven fabric is placed on the horizontal plane, the surface farthest from the horizontal plane and the surface closest to the horizontal plane in the vertical direction with respect to the horizontal plane. And.
  • the opposite side is the side on which the above-mentioned binder is sprayed.
  • the fixed binder has a binding property that is fixed to the surface of the fiber intersection and does not run off. Further, the binder has the strength to withstand the mobility of the fibers at the fiber intersections required for the cushioning property of the non-woven fabric, and has the elasticity to restore the positional relationship between the fibers after the movement. Further, it is preferable that the binder has an elastic strain larger than that of the fiber from the viewpoint of the above-mentioned action.
  • the binder acts on the fiber intersections, for example, as follows. As in the non-woven fabric 100 shown in FIGS. 1A and 1B, a compressive force (pressing pressure) F is applied to one surface 1A, and then the compressive force F is removed. At this time, at the fiber intersection 6 in the non-woven fabric 100, the grade separation of the fibers 7 is crushed by the compressive force F. However, when the pressing force F is removed, the binder 8 restores the arrangement of the overpasses of the fibers 7 at the fiber intersection 6 (FIG. 1 (C)).
  • the binder 8 causes the fiber 7 to cross over at the fiber intersection 6. The placement is restored.
  • the non-woven fabric 100 is shown in FIGS. 1 (A) and 1 (B) as being placed on the base material 200, the present invention is not limited to this form.
  • fiber having a thickness direction component of a non-woven fabric is a component in the vertical direction as a vector with respect to the horizontal plane when one of the front and back surfaces of the non-woven fabric of the present invention is allowed to stand on a horizontal plane.
  • the "other fibers” refer to other fibers when focusing on one "fiber having a thickness direction component of the non-woven fabric”.
  • “Having a thickness direction component” means that the vertical direction component is more than zero.
  • the fibers having the thickness direction component of the non-woven fabric can be confirmed by the same method as in (6a) and (6b) of (Method for measuring the vertical orientation of the non-woven fabric) described later. Further, the presence or absence of the binder in the fibers having the thickness direction component of the non-woven fabric can be confirmed by the same method as described later (method for measuring the abundance of the binder on the fiber intersection at the center of the thickness of the non-woven fabric). ..
  • the adhesive force of the adhesive or the like is weakened by a cooling means such as cold spray, and the non-woven fabric is taken out from the product to perform the above treatment.
  • This method of removing the non-woven fabric is similarly applied to other measurements herein.
  • Fibers having a thickness direction component of the non-woven fabric are dyed at the center of the thickness according to (4a) to (4c) of (Method for measuring the abundance of the binder on the fiber intersection at the center of the thickness of the non-woven fabric) described later.
  • intersection it means that the binder is present at "the fiber intersection where the fiber having the thickness direction component intersects with other fibers in the thickness center portion of the non-woven fabric".
  • the "fiber having the thickness direction component of the non-woven fabric” and other materials are present at the position of the fiber intersection where the binder is present. It acts to restore the positional relationship with the fibers (arrangement of three-dimensional intersections).
  • the orientation direction of the "fiber having the thickness direction component of the non-woven fabric” can be easily recovered, and as a result, the thickness recovery property of the non-woven fabric becomes excellent.
  • the thickness recovery is evaluated by the compression recovery rate, and the larger the value of the compression recovery rate, the better the thickness recovery. From this viewpoint, it is preferable that the binder is present at a plurality of fiber intersections of the "fiber having a thickness direction component of the non-woven fabric".
  • the "thickness center portion” is defined as between the horizontal plane and the virtual plane in contact with the outermost portion on the side opposite to the surface of the non-woven fabric in contact with the horizontal plane when the non-woven fabric is allowed to stand on the horizontal plane. It means a portion located at a position of 50% of the distance in the vertical direction with respect to the horizontal plane (hereinafter, the vertical direction with respect to the horizontal plane may be simply referred to as "vertical direction”). The vertical distance between the horizontal plane and the virtual plane is also referred to as the apparent thickness of the non-woven fabric.
  • the apparent thickness is, for example, the vertical distance between the position of the top of the convex portion on one surface side and the position of the top of the convex portion on the other surface side when the nonwoven fabric of the present invention has an uneven shape on both sides.
  • the apparent thickness of the non-woven fabric can be measured by the following measuring method under a load of 50 Pa.
  • the 50 Pa load means a load that suppresses fluffing on the surface of the non-woven fabric, and is a load necessary for appropriately measuring the apparent thickness of the non-woven fabric.
  • the non-woven fabric to be measured is cut into 10 cm ⁇ 10 cm to prepare a measurement sample.
  • a laser thickness gauge high-precision displacement sensor ZS-LD80 (trade name) manufactured by OMRON Corporation. All laser thickness gauges used in the present specification are this) is used, and 50 Pa is applied to the measurement sample. Measure the thickness under load. Measure at 3 points and use the average value as the apparent thickness of the non-woven fabric to be measured.
  • a load of 50 Pa is applied to the non-woven fabric, for example, by placing a circular plate having a diameter of 2.5 cm and a mass of 2.45 g on the non-woven fabric.
  • the adhesive force of the adhesive or the like is weakened by a cooling means such as cold spray, and the non-woven fabric is taken out from the product to perform the above measurement.
  • This method of removing the non-woven fabric is similarly applied to other measurements herein. If the size of the non-woven fabric to be measured cannot be taken out in a size of 10 cm ⁇ 10 cm, it is taken out in a size as large as possible.
  • the thickness of the non-woven fabric here is measured by the following method.
  • the non-woven fabric to be measured is cut into 10 ⁇ 10 cm, and a laser thickness gauge (manufactured by OMRON Corporation, high-precision displacement sensor ZS-LD80 (trade name)) is used to measure the thickness under a load of 50 Pa. taking measurement. Measure at three points and use the average value as the thickness of the non-woven fabric (this thickness measurement is also applied to other measurements). If the non-woven fabric to be measured cannot be cut into 10 x 10 cm, cut it as large as possible.
  • a laser thickness gauge manufactured by OMRON Corporation, high-precision displacement sensor ZS-LD80 (trade name)
  • the apparent thickness of the nonwoven fabric under a load of 50 Pa is preferably 1.3 mm or more, more preferably 1.5 mm or more, further preferably 2.0 mm or more. 3.0 mm or more is even more preferable, 4.5 mm or more is even more preferable, and 5.5 mm or more is even more preferable. From the same viewpoint, the apparent thickness is preferably 15 mm or less, more preferably 10 mm or less, further preferably 9 mm or less, and even more preferably 8.5 mm or less.
  • the basis weight is preferably 10 g / m 2 or more, more preferably 15 g / m 2 or more, 20 g / m 2 or more is more preferable, 25 g / m 2 or more is even more preferable.
  • the basis weight is preferably 60 g / m 2 or less, more preferably 55 g / m 2, more preferably 50 g / m 2 or less, 48 g / m 2 or less still more preferably more.
  • the binder may be further present at other fiber intersections as long as it is present at "fiber intersections where fibers having a thickness direction component intersect with other fibers at the center of thickness of the non-woven fabric".
  • the positional relationship between the fibers can be restored while having soft deformability at the time of pressing.
  • the binder is present at the fusion point between the fibers, the positional relationship (overpass relationship) between the fixed fibers can be maintained more firmly.
  • the binder is present at both the fusion point between the fibers and the intersection portion between the fibers that are not fused.
  • the number of "fiber intersections where fibers oriented in the thickness direction intersect with other fibers" in which a binder is present is preferably the number of fused fiber intersections> the number of unfused fiber intersections.
  • the binder satisfies one or both of the following requirements (1) and (2).
  • the abundance area ratio of the binder per unit area is smaller than the fiber area ratio of the portion not covered by the binder.
  • the ratio of the mass of the binder to the mass of the non-woven fabric is 65 percentage points or more smaller than the ratio of the mass of fibers to the mass of the non-woven fabric.
  • the abundance area ratio and mass ratio of the binder defined in the requirements (1) and (2) are not limited to the binder existing at the "fiber intersection where the fiber having the thickness direction component intersects with other fibers", and the non-woven fabric. Indicates the value related to the binder contained in. For example, it includes a binder existing at "intersections between fibers other than" fibers having a thickness direction component "", a binder existing on a fiber surface that is not a fiber intersection, and a binder existing in a space between fibers.
  • the fiber area ratio and the fiber mass defined in the requirements (1) and (2) are the area ratio and the mass in the state where the binder is not present on the fiber (the fiber surface is not covered with the binder). Meaning (The same meaning applies to other matters described below).
  • the stickiness when the non-woven fabric comes into contact with the skin and the hardening of the entire non-woven fabric are achieved by appropriately suppressing the amount of adhesion of the binder while enabling the effective expression of the action of the binder described above. Can be suppressed. That is, the soft touch characteristic of the thermal bond non-woven fabric can be maintained. Since the binder has adhesiveness, the above-mentioned effects can be exhibited with a small amount. Therefore, it is preferable that the binder is present at the fusion point between the fibers. Since the fusion points have already formed the bonded intersections, it is not necessary to form the intersections with a binder for fixing the fibers to each other.
  • the above-mentioned action of the binder can be effectively expressed. Further, by making the mass ratio of the binder smaller than the mass ratio of the fibers by 65 percentage points or more, the amount of the binder becomes small and cannot exist between the fibers. As a result, the binder aggregates at the fiber entanglement point having high capillary force, and can be selectively attached to the fiber entanglement point appointed for recovery. As a result, the non-woven fabric of the present invention has excellent recovery of thickness after compression and maintains a fluffy texture.
  • the non-woven fabric of the present invention is incorporated as a surface sheet of an absorbent article such as a diaper, and the absorbent article is folded and enclosed in a packaging bag, the bulkiness and soft texture of the non-woven fabric of the present invention are obtained when the non-woven fabric of the present invention is taken out after opening. Is realized.
  • the requirements (1) and (2) can be measured by the following methods.
  • an oil agent, a treatment agent such as a skin care agent or a hot melt type adhesive, and polyethylene terephthalate, polyethylene, or polypropylene are used as the fiber composition, as appropriate.
  • the solvent, conditions, etc. can be adjusted according to the components.
  • the existing area of the binder and the fiber area not covered by the binder are calculated.
  • the surface on which the binder exists is larger (one surface or the opposite surface of the front and back surfaces of the non-woven fabric sample) is used as the measurement surface.
  • the above measurement is performed at each of the three points on the measurement surface, and the averaged value is used as the measured value data. From the averaged measured value, the abundance area ratio of the binder and the fiber area ratio not covered by the binder are compared to determine whether or not the requirement (1) is satisfied.
  • (1b-1) Shake the container of Bowken Stain II well and mix well.
  • (1b-2) Take 1.5 mL of the mixed Bowkenstain II in a beaker having a size of about 200 mL, add deionized water, and prepare a dyeing solution so that the total volume becomes 30 mL.
  • (1b-3) The dyeing solution is heated, a non-woven fabric sample is added at about 90 ° C. before boiling, and the dyeing solution is boiled at 95 ° C. for 2 minutes.
  • (1b-4) The non-woven fabric sample is taken out, washed thoroughly with water, and then dried.
  • (1b-5) Judgment is made by comparing with the distinguishing color. For example, a binder containing an acrylic resin or styrene-butadiene rubber is dyed red and the fibers remain white. However, the dyeing color of the binder differs depending on the binder component.
  • the binder region containing an acrylic resin or styrene-butadiene rubber is dyed red using the fiber discrimination reagent Bowkenstain II, the fiber region remains white, and other than the binder region and the fiber region. Areas (such as voids between fibers) are black.
  • the observed image is quantified (white, red, black). This is performed by image processing with a computer, and the red area and the white area are calculated in the RGB color model.
  • (1d-2) Convert from the RBG color model to the HSV color model.
  • red is defined as H: 0 ° or more and 90 ° or less, 270 ° or more and 360 ° or less, S: 30% or more and 100% or less, and V: 40% or more and 100% or more.
  • White is defined as H: 0 ° or more and 360 ° or less, S: 0% or more and 20% or less, and V: 40% or more and 100% or less.
  • Black is defined as a range other than the above. (1d-3) In this way, the red area (binder) and the white area (fiber) are calculated in the HVS color model, and the process of (d) is performed.
  • the non-woven fabric of the present invention preferably has a larger amount of binder on the opposite surface (second surface) side than on one surface (first surface) side of the front and back surfaces. It is preferable that the requirement (1) is satisfied on the opposite surface side. For example, when the binder is sprayed on one surface of the non-woven fabric and spread in the thickness direction, the amount of the binder fixed to the sprayed surface side increases. Based on this, in the above (measurement method of requirement (1)), the tendency of the amount of adhesion of the entire non-woven fabric can be grasped with the "surface side having the larger abundant area ratio of the binder" as the measurement surface side. ..
  • the observation image on the measurement surface side can capture not only the captured surface but also the inside of the thickness that can be observed from the surface (the range in focus in the observation image is the measurement target). It should be noted that these things also apply to the case where the observation image is acquired by the above (1a) to (1c) and the measurement is performed in another measurement method.
  • the above (measurement method of requirement (1)) not only the surface of the non-woven fabric but also the binder region inside the thickness is captured, and the amount of the binder adhered to the non-woven fabric is the relative area ratio in comparison with the fiber. Can be grasped as. Since the binder exhibits elasticity while also having adhesiveness, by spraying the binder on one side of the non-woven fabric, a smooth texture without adhesiveness and a fluffy texture with recovery are performed on the non-sprayed surface. Can be compatible with each other.
  • the difference (M2-M1) between the abundance area ratio (M1) of the binder per unit area and the fiber area ratio (M2) which is a portion not covered by the binder is the adhesiveness of the binder. From the viewpoint of effectively expressing elasticity, 80 percentage points or more are preferable, 90 percentage points or more are more preferable, and 99 percentage points or more are further preferable.
  • the difference (M2-M1) is preferably 99.99 percentage points or less, more preferably 99.95 percentage points or less, still more preferably 99.9 percentage points or less, from the viewpoint of exhibiting the elastic effect of the binder.
  • the HFIP insoluble matter heated xylene insoluble matter obtained in (2c) above is weighed and TG / DTA measurement is performed.
  • the amount burned in the TG / DTA measurement is defined as the binder mass (the fiber may contain additives such as titanium oxide. If the fiber has titanium oxide, this will cause the binder and oxidation.
  • Titanium can be separated.
  • the ratio (%) of the binder mass is calculated by dividing the binder mass obtained in (2d) by 1.0 g of the non-woven fabric sample prepared in (2a). Further, the weight of the HFIP insoluble matter heated xylene insoluble matter obtained in the above (2d) is divided by 1.0 g of the non-woven fabric sample prepared in the above (2a) to calculate the ratio (%) of the fiber mass. From the difference between the ratio (%) of the binder mass and the ratio (%) of the fiber mass, it is determined whether or not the requirement (2) is satisfied.
  • the amount of binder adhered to the entire non-woven fabric can be grasped as a mass ratio to the mass of the non-woven fabric as a relative relationship with fibers.
  • the relationship between the fiber and the binder can be grasped by excluding the influence of the skin care agent, hot melt, oil agent, etc. that may be contained in the weight of the non-woven fabric.
  • the ratio of the mass of the binder to the mass of the non-woven fabric (W1) is the ratio of the mass of fibers to the mass of the non-woven fabric (W2). It is more preferably 78 percentage points or more smaller, and even more preferably 81 percentage points or more smaller. Further, from the viewpoint of exhibiting the elastic effect of the binder, the difference (W2-W1) is preferably 90 percentage points or less, more preferably 85 percentage points or less.
  • the abundance of the binder on the fiber intersections of the non-woven fabric on at least one of the front and back surfaces of the non-woven fabric when viewed in a plan view is 5% or more and 60% or less per unit area of the non-woven fabric. preferable.
  • an appropriate amount of the binder is present at the fiber intersection of the non-woven fabric, the sticking of the fibers to each other by the binder is suppressed, and the arrangement of the grade separation of the fibers at the fiber intersection can be more smoothly restored.
  • the thickness recovery due to the action of the binder described above and the sticky feeling of the non-woven fabric can be suppressed.
  • the abundance of the binder on the fiber intersections is more preferably 10% or more per unit area of the non-woven fabric from the viewpoint of further enhancing the above effect. It is preferably 20% or more, and more preferably 20% or more.
  • the abundance of the binder on the fiber intersections is the unit area of the non-woven fabric from the viewpoint of more effectively expressing elasticity than the adhesiveness of the binder. It is more preferably 50% or less, and further preferably 35% or less.
  • the surface side of any of the above-mentioned front and back surfaces is the second surface side.
  • the second surface side is the surface (non-skin surface) side that does not come into contact with the skin during use, as described above.
  • the fiber intersections in the abundance of the binder on the fiber intersections are fusion points.
  • the abundance of the binder on the fusion point is preferably in the above-mentioned numerical range.
  • the amount of the binder can be significantly reduced as compared with the case where the binder itself binds the fibers to each other, and as a result, the formation of a film between the fibers is suppressed, the sticky feeling is reduced, and the thickness recovery is further improved. It becomes possible to make it easy to express.
  • the fiber intersections are fusion points for the same reason as described above. Further, the abundance rate of the binder on the fusion point is preferably in each numerical range shown for various "presence rates of the binder on the fiber intersection point" described later.
  • the range in focus in the observation image is the measurement target.
  • the fiber intersection counts both fibers that are fused and those that are not fused.
  • the covering area ratio (K) of the binder on one surface (first surface) side of the nonwoven fabric is preferably 0.05% or less, preferably 0.03% or less, per unit area. More preferably, it is more preferably 0.02% or less. Thereby, the sticky feeling on the surface of the non-woven fabric can be suppressed. Further, the covering area ratio (K) of the binder on one surface (first surface) side of the nonwoven fabric is preferably 0.0001% or more from the viewpoint of giving elasticity to the surface of the nonwoven fabric.
  • the coating area ratio (K) of the binder on the opposite surface (second surface) side of the non-woven fabric is preferably 0.001% or more per unit area from the viewpoint of exhibiting the elastic effect of the binder to be higher. It is more preferably 01% or more, and further preferably 0.025% or more. Further, the covering area ratio (K) of the binder on the opposite surface (second surface) side of the non-woven fabric is preferably 1% or less from the viewpoint of preventing the adhesive from increasing due to contact between the binders.
  • the above-mentioned coverage area ratio (K) applies mutatis mutandis to the above (method for measuring the abundance of the binder on the fiber intersection on any surface side of the front and back surfaces of the non-woven fabric when viewed in a plan view), and is opposite to one surface side. Obtained by measuring on the surface side.
  • the coverage area ratio (K) of the binder is calculated by using the area of the observation screen of the non-woven fabric (the total area of the fibers (fibers covered with the binder and the fibers not covered with the binder) and the voids between the fibers) as the denominator. calculate.
  • the abundance (H) of the binder on the fiber intersection at the thickness center portion is 10% or more and 60% or less per unit area. preferable. Since the binder exists up to the inside in the thickness direction, the thickness recovery property of the non-woven fabric is further improved, and a fluffy texture can be maintained. From the viewpoint of further enhancing the above effect, the abundance (H) of the binder at the fiber intersection at the center of the thickness of the non-woven fabric is more preferably 20% or more, and further preferably 30% or more per unit area. ..
  • the abundance (H) of the binder on the fiber intersection at the center of the thickness of the non-woven fabric is more preferably 50% or less per unit area from the viewpoint of more effectively expressing elasticity than the adhesiveness of the binder. It is preferably 45% or less, and more preferably 45% or less.
  • the above-mentioned "thickness center portion” is as defined above.
  • the above-mentioned “cross section passing through the thickness center portion” refers to the fiber layer passing through the thickness center portion and forming the non-woven fabric surface, as shown below (method for measuring the abundance of the binder on the fiber intersection at the thickness center portion of the non-woven fabric). It means a cross section A that is orthogonal to the cross section and a cross section B that passes through the center of the thickness and is orthogonal to the cross section A.
  • the cross section is a cross section along the MD (Machine Direction) direction (machine flow direction in the manufacturing process) on the non-woven fabric plane, a cross section along the CD (Cross Direction) direction (direction orthogonal to the machine flow direction), and an arbitrary cross section between them. It may be any of the cross sections of. A cross section that passes through the center of the thickness along at least one of the plane directions may satisfy a predetermined requirement. (4c) The sample prepared in (4b) above is allowed to stand on a horizontal plane with its cross section facing upward. In the stationary state, an observation image is taken at 100 times using a digital microscope.
  • the two cross sections A and B of (4b) are, for example, the following cross sections.
  • the cross section A passes through the center of the thickness with respect to the fiber layer forming the non-woven fabric surface (flat surface).
  • the cross section B is a cross section that passes through the central portion of the thickness and is along the plane of the non-woven fabric.
  • the cross section A is a cross section along the line AA in the vertical direction passing through the thickness center 105 of the non-woven fabric 100S.
  • FIG. 3A the cross section A is a cross section along the line AA in the vertical direction passing through the thickness center 105 of the non-woven fabric 100S.
  • the cross section B is a cross section along the horizontal line BB at the position of the thickness center portion 105 of the non-woven fabric 100S. Further, when the fiber layer of the non-woven fabric meanders in the thickness direction and has a concave-convex shape in which convex portions and concave portions are alternately provided, the cross section A passes through the central portion of the thickness and passes through the non-woven fabric surface (the top of the convex portion and the bottom of the concave portion). It is a cross section orthogonal to the fiber layer forming the surface of the connecting wall portion).
  • the cross section B is a cross section along the fiber layer that passes through the central portion of the thickness and forms the non-woven fabric surface (the surface of the wall portion that connects the top of the convex portion and the bottom of the concave portion).
  • the cross section A is a cross section along the line AA passing through the thickness center 105 of the non-woven fabric 100W.
  • the cross section B is a cross section along the line BB (the line orthogonal to the line AA) at the position of the thickness center 105 of the non-woven fabric 100W.
  • the abundance (H) on the fiber intersection of the binder when the non-woven fabric is viewed in a plan view is opposite to the one surface (first surface) side of the front and back surfaces (second surface) of the non-woven fabric. It is preferable that the surface) side is large.
  • the opposite surface (second surface) side in this case is preferably the surface side (non-skin surface side) that does not touch the skin.
  • the one surface (first surface) side is preferably the surface side (skin surface side) that comes into contact with the skin.
  • the thickness recovery property due to the action of the binder is maintained, the sticky feeling when touching the skin is suppressed, and the soft texture of the non-woven fabric is maintained. can do.
  • the non-woven fabric of the present invention is manufactured by the air-through method, the fusion point of the fibers is relatively smaller on the opposite surface side than on the surface side on which the hot air is blown, and the texture becomes smoother due to the difference in the amount of heat during production. .. Therefore, in the non-woven fabric of the present invention, it is preferable that the surface side on which the hot air is blown is the opposite surface (second surface, non-skin surface side) having a large amount of the binder described above.
  • the abundance (H) of the binder on the fiber intersection when the non-woven fabric is viewed in a plan view is 10 percentage points or more larger on the opposite surface side than the one surface side of the front and back surfaces of the non-woven fabric. Is preferable. Further, it is more preferable that the abundance (H) of the binder on the fiber intersection when the non-woven fabric is viewed in a plan view is 15 percentage points or more larger on the opposite surface side than the one surface side of the front and back surfaces of the non-woven fabric. , 18 percentage points or more is more preferable.
  • the abundance (H) on the fiber intersection of the binder when the non-woven fabric is viewed in a plan view is one surface side of the front and back surfaces of the non-woven fabric. It is larger on the opposite side than the above, and the difference is preferably 50 percentage points or less, preferably 30 percentage points or less, and further preferably 20 percentage points or less.
  • the abundance of the binder on the fiber intersection when the non-woven fabric is viewed in a plan view on one surface side and the opposite surface side is the fiber of the binder on any surface side of the front and back surfaces of the non-woven fabric when viewed in a plan view.
  • Method of measuring the abundance rate at the intersection is applied mutatis mutandis.
  • (3b) of the above method for measuring the abundance of the binder on the fiber intersection on any of the front and back surfaces of the non-woven fabric when viewed in a plan view
  • the fiber intersection is performed on one surface side and the opposite surface side, respectively.
  • the score (N) and the number of dyed fiber intersections (Nb) are counted.
  • the abundance rate (H) (%) on each surface side is calculated based on the formula (S1) of (3c).
  • three-point observation images are prepared and measured for each of one side and the other side, and the average is used as the measured value data. From the measured value data, the abundance of the binder on the opposite surface side on the fiber intersection is subtracted from the abundance of the binder on one surface side on the fiber intersection, and the difference is calculated.
  • the binder covering area ratio (K1) on one surface side is the binder covering area ratio (K2) on the opposite surface side. It is preferably 0.9 times or less, more preferably 0.6 times or less, and further preferably 0.53 times or less.
  • the coating area ratio of the binder on one surface side is preferably 0.01 times or more of the coating area ratio of the binder on the opposite surface side from the viewpoint of exhibiting recoverability due to the elasticity of the binder, and is 0. More preferably, it is 0.05 times or more. This makes it possible to achieve both a fluffy texture and smoothness on the skin surface side.
  • the area where the binder exists between the fibers (gap) when the fibers are separated by the fiber diameter or more suppresses the binding property between the fibers by the binder and facilitates the arrangement of the three-dimensional intersections of the fibers at the fiber intersection. From the viewpoint of facilitating recovery, 15% or less is preferable, 5% or less is more preferable, and 1% or less is further preferable. Further, it is preferable that the area where the binder exists between the fibers (gap) is as small as possible when the fibers are separated by the fiber diameter or more, but from the viewpoint of exhibiting the elasticity of the binder, 0.005% or more. Is practical.
  • the ratio of the mass of the binder to the mass of the nonwoven fabric is preferably 1% or more and 20% or less.
  • the ratio of the mass of the binder to the mass of the non-woven fabric is more preferably 7% or more, further preferably 8% or more, from the viewpoint of further enhancing the above effect.
  • the ratio of the mass of the binder to the mass of the non-woven fabric is more preferably 10% or less, still more preferably 9% or less, from the viewpoint of further enhancing the effect of suppressing stickiness.
  • the ratio of the mass of the binder to the mass of the non-woven fabric described above can be measured based on the above (measurement method of requirement (2)).
  • the nonwoven fabric of the present invention preferably contains a composite fiber having two or more kinds of resin components having different melting points.
  • a composite fiber having two or more kinds of resin components having different melting points.
  • the temperature is raised to 300 ° C. at a heating rate of 10 ° C./min, and the endothermic peak is measured.
  • the measured peaks are two or more, it is determined that there are two or more types of resin components contained in the composite fiber.
  • the degree of vertical orientation of the non-woven fabric is preferably 60% or more.
  • the degree of longitudinal orientation of the nonwoven fabric of the present invention is more preferably 65% or more, further preferably 70% or more, from the viewpoint of further enhancing the above effects.
  • the degree of longitudinal orientation of the nonwoven fabric of the present invention is preferably 95% or less, more preferably 80% or less, still more preferably 75% or less, from the viewpoint of increasing the strength of the nonwoven fabric.
  • the "longitudinal orientation” referred to here is a value measured by the following (measurement method of the longitudinal orientation of the non-woven fabric), and is a value indicating the degree to which the directions of the fibers having the thickness direction component are aligned.
  • the reference line L is composed of an upper side L1 and a lower side L2 aligned in the direction along the horizontal plane, and a left side L3 and a right side L4 aligned in the vertical direction. (6d) Count the total number of fibers passing through the reference line consisting of each side of the square.
  • the total number of fibers passing through the reference lines L of the upper and lower sides L1 and L2 of the square is defined as the "upper and lower fibers”
  • the total number of fibers passing through the reference lines L of the left and right sides L3 and L4 of the square is defined as the "number of left and right fibers".
  • the degree of longitudinal orientation Q of the non-woven fabric is calculated as (number of upper and lower fibers) / (number of upper and lower fibers + number of left and right fibers) ⁇ 100.
  • Three-point observation images are prepared and measured with the same non-woven fabric sample, and the average is used as the measured value data. Note that FIG. 5 shows an observation screen with a square reference line L. In the figure, the black dot 71 is a position where the fiber 7 passes through the reference line L (L1 to L4).
  • the recoverability of the non-woven fabric is synergistically improved.
  • the degree of longitudinal orientation is equal to or higher than the above lower limit% and the abundance of the binder on the fiber intersections is equal to or higher than the above lower limit per unit area of the non-woven fabric, the intersections of the vertically oriented fibers are elastic in the binder. It is preferable from the viewpoint of improving the recoverability.
  • the non-woven fabric of the present invention preferably has the above-mentioned structure, but has a concavo-convex shape including a convex portion, a concave portion, and a wall portion connecting the convex portion and the concave portion in the thickness direction of the non-woven fabric.
  • the non-woven fabric of the present invention becomes bulkier (thicker) and feels better while suppressing the basis weight.
  • the non-woven fabric of the present invention is enhanced in compressibility in the thickness direction, and at the same time, has compressibility recovery by the binder. That is, the non-woven fabric of the present invention can remarkably exhibit thickness recovery with respect to high compressibility, and can have high cushioning properties.
  • the non-woven fabric of the present invention has high cushioning properties and can be retained even after compression.
  • the amount of the binder fixed is suppressed to the range required for thickness recovery, and the sticky feeling is reduced. Therefore, the sticking of the fiber to the support at the time of shaping the unevenness is suppressed, and good shaping of the unevenness can be realized.
  • the binder is present on the wall portion. As a result, the above effect becomes more excellent.
  • the "concavo-convex shape” refers to a shape in which the cross-sectional shape of the non-woven fabric differs depending on the position of the non-woven fabric in the vertical direction with respect to the horizontal plane.
  • the “wall portion” is 25% of the thickness (apparent thickness) in the vertical direction with respect to the horizontal plane when the non-woven fabric of the present invention is allowed to stand on a horizontal plane, and is opposite to 25% on one side (first side). (Second surface side) It means a fibrous layer portion in a region of 50% (hereinafter referred to as a thickness intermediate layer) excluding 25%.
  • the apparent thickness referred to here is a value obtained by using the method for measuring the "thickness of the non-woven fabric" shown in the above-mentioned definition of the "thickness center portion".
  • the non-woven fabric having an uneven shape various materials usually used as a material that comes into contact with the skin can be used.
  • the convex portion is solid, the convex portion is hollow, the fiber layer has a one-layer structure, the fiber layer has a two-layer structure, and the convex portion has a scattered point shape in the plane direction.
  • the convex portion has a scattered point shape in the plane direction.
  • There are various types such as those arranged in a ridge and those in which convex portions and concave portions are arranged in a ridge shape. Specific examples of each type include the non-woven fabrics shown in FIGS. 6 to 19.
  • the convex portion of the concave-convex shape may be a solid, two-layer structure.
  • the non-woven fabric 10 (Specific Example 1) contains thermoplastic fibers and heat-shrinkable fibers, and is the upper layer 11 and the second surface 1B (surface sheet) on the first surface 1A (skin contact surface when used as a surface sheet). It has a two-layer structure of the lower layer 12 on the non-skin contact surface) side. Further, two layers are joined by embossing (squeezing) from the first surface 1A in the thickness direction (the embossed portion is referred to as an embossed recess (concave joint portion) 13).
  • the lower layer 12 is a layer in which heat shrinkage of heat-shrinkable fibers is exhibited. Due to the heat shrinkage of the lower layer 12, the upper layer 11 has a solid convex portion 14 raised on the first surface 1A side in the region of the embossed recess 13. Further, the upper layer 11 is provided with a wall portion 15 that connects the convex portion 14 and the embossed concave portion 13.
  • the non-woven fabric 10 typically has the shape shown in FIG.
  • the non-woven fabric 10 can be manufactured, for example, by the materials and manufacturing methods described in paragraphs [0032] to [0048] of JP-A-2002-187228.
  • a non-woven fabric having a two-layer structure with a hollow convex portion having an uneven shape can be mentioned.
  • the non-woven fabric 20 (Specific Example 2) has a two-layer structure including a hollow portion 21. Both layers contain thermoplastic fibers.
  • the non-woven fabric 20 has a joint portion 22 in which the first non-woven fabric 20A and the second non-woven fabric 20B are partially heat-sealed. In the non-joint portion surrounded by the joint portion 22, the first non-woven fabric 20A protrudes in a direction away from the second non-woven fabric 20B, and has a plurality of convex portions 23 having a hollow portion 21 inside.
  • the non-woven fabric 20 is provided with a wall portion 25 connecting the convex portion 23 and the concave portion 24.
  • the non-woven fabric 20 typically has the shape shown in FIG.
  • the non-woven fabric 20 can be formed by a commonly used method. For example, the first non-woven fabric 20A is formed into a concavo-convex shape by engaging two concave-convex rolls, and then the second non-woven fabric is bonded to obtain the non-woven fabric 20.
  • the non-woven fabric 30 (Specific Example 3) contains thermoplastic fibers and has a two-layer structure including an upper layer 31 and a lower layer 32. Hollow convex portions 33 and concave portions 34 are alternately arranged in the upper layer 31, and the concave portions 34 are perforated.
  • the non-woven fabric 30 is provided with a wall portion 35 connecting the convex portion 33 and the concave portion 34.
  • the non-woven fabric 30 typically has the shape shown in FIG.
  • Such a non-woven fabric 30 can be produced, for example, by the method described in Japanese Patent Application Laid-Open No. 4-24263, page 6, lower left column, line 12 to page 8, upper right column, line 19.
  • Examples thereof include a non-woven fabric having a single-layer structure having an uneven shape on both sides.
  • the non-woven fabric 40 (Specific Example 4) has a single-layer structure containing thermoplastic fibers and has a shape of unevenness on both sides. Specifically, the first convex portion 41 projecting toward the first surface 1A side and the second convex portion 42 projecting toward the second surface 1B side alternately alternate in different directions when the non-woven fabric 40 is viewed in a plan view. It is arranged continuously.
  • the first convex portion 41 and the second convex portion 42 each have an open internal space on the opposite surface side, and this portion forms the concave portions 43 and 44 on that surface.
  • the first surface 1A has a concave-convex shape of the first convex portion 41 and the concave portion 44.
  • the second surface 1B has a concave-convex shape of the second convex portion 42 and the concave portion 43.
  • the non-woven fabric 40 has a wall portion 45 connecting the first convex portion 41 and the second convex portion 42.
  • the wall portion 45 forms the wall surface of the internal space of each of the first convex portion 41 and the second convex portion 42, and has an annular structure in the plane direction.
  • the fibers constituting the wall portion 45 have fiber orientation in the thickness direction of the non-woven fabric connecting the first protruding portion 41 and the second protruding portion 42 at any point of the annular structure.
  • the non-woven fabric 40 typically has the shape shown in FIG.
  • the non-woven fabric 50 (Specific Example 5) has a one-layer structure including thermoplastic fibers, and has a concavo-convex shape in which streaky convex portions 51 and concave portions 52 are alternately arranged on the first surface 1A side.
  • concave portions 53 corresponding to the convex portions 51 on the first surface 1A side and convex portions 54 corresponding to the concave portions 52 on the first surface 1A side are alternately arranged to form an uneven shape.
  • the non-woven fabric 50 is provided with a wall portion 55 that connects the convex portion 51 and the concave portion 52 (the concave portion 53 and the convex portion 54).
  • the non-woven fabric 50 typically has the shape shown in FIG.
  • Examples thereof include a non-woven fabric having a solid and one-layer structure in which the convex portion of the concave-convex shape is solid.
  • the non-woven fabric 60 (Specific Example 6) has a one-layer structure containing thermoplastic fibers, and is arranged along a semi-cylindrical solid convex portion 61 and a side edge of the convex portion 61 on the first surface 1A side. It has a shape in which a plurality of the recesses 62 are alternately arranged. Below the recess 62, a recess bottom 63 made of non-woven fiber is arranged.
  • the non-woven fabric 60 is provided with a wall 64 connecting the convex portion 61 and the concave portion 62.
  • the non-woven fabric 60 typically has the shape shown in FIG.
  • the non-woven fabric 70 (Specific Example 7) has a one-layer structure including thermoplastic fibers and heat-extensible fibers, and has an uneven shape on the first surface 1A side.
  • the second surface 1B side is flat or the degree of unevenness is much smaller than that of the first surface 1A side.
  • the concave-convex shape on the first surface 1A side has a plurality of solid convex portions 71 and linear concave portions 72 surrounding the convex portions 71.
  • the linear recesses 72 are arranged in a grid pattern, and the protrusions 71 are scattered in each region partitioned by the grid.
  • the recess 72 has a pressure-bonded portion in which the constituent fibers of the non-woven fabric 70 are pressure-bonded or bonded, and the heat-extensible fiber is in a non-stretchable state.
  • the convex portion 71 is a portion where the heat-extensible fiber is thermally stretched and raised toward the first surface 1A.
  • the non-woven fabric 70 has a wall portion 73 connecting the convex portion 71 and the concave portion 72.
  • the non-woven fabric 70 typically has the shape shown in FIG.
  • Such a non-woven fabric 70 can be produced by performing linear heat embossing on a fiber web and stretching heat-extensible fibers by air-through processing.
  • Examples thereof include a non-woven fabric having a one-layer structure in which the convex portion of the concave-convex shape is hollow and both sides of the non-woven fabric have the concave-convex shape.
  • the non-woven fabric 80 (Specific Example 8) has a single-layer structure containing thermoplastic fibers and has an uneven shape as shown below. That is, they are arranged between the outer surface fiber layers 81 and 82 on the first surface 1A side and the second surface 1B side, and between the outer surface fiber layer 81 on the first surface 1A side and the outer surface fiber layer 82 on the second surface 1B side.
  • the non-woven fabric 80 has a concave-convex shape including a hollow convex portion, a concave portion, and a wall portion connecting the convex portion and the concave portion in the thickness direction thereof. This uneven shape is formed on both the first surface 1A side and the second surface 1B side.
  • the convex portion 81 formed by the outer surface fiber layer 81 and the concave portion 88 between the outer surface fiber layer 81 have an uneven shape.
  • the convex portion 82 formed by the outer surface fiber layer 82 and the concave portion 89 between the outer surface fiber layer 82 have an uneven shape.
  • the convex portion 81 formed by the outer surface fiber layer 81 and the convex portion 82 formed by the outer surface fiber layer 82 are both hollow.
  • the connecting portion 83 forms a wall portion 83 that connects the convex portion 81 and the concave portion 88 (the convex portion 82 and the concave portion 89).
  • the uneven shape of the nonwoven fabric 80 may be such that the convex portion 81 formed by the outer surface fiber layer 81 and the concave portion 88 between them are arranged in a ridge shape on the first surface 1A side.
  • the convex portion 82 formed by the outer surface fiber layer 82 and the concave portion 89 between them may be arranged in a ridge-like shape.
  • the outer fiber layers 81 and 82 may have fibers oriented in the plane direction.
  • the wall portion 83 formed by the connecting portion 83 may have fibers having a thickness direction component.
  • first outer surface fiber layer 81A and second outer surface fiber having a length in which the outer surface fiber layer 81, which is a convex portion on the first surface 1A side, extends along different directions intersecting each other in a plan view of the non-woven fabric. It may have layer 81B).
  • the plurality of connecting portions 83 are arranged along the respective directions in which the non-woven fabrics intersect in a plan view, and the directions of the wall surfaces of the connecting portions 83 are different from each other (first connecting portion 83A and second connecting portion 83A).
  • Part 83B) may be provided.
  • the first connecting portion 83A and the second connecting portion 83B may have different wall surfaces or the fibers may be vertically oriented.
  • the non-woven fabric 80 typically has the shape shown in FIG. Such a non-woven fabric 80 can be produced by the method described in paragraphs [0049] to [0057] of JP-A-2019-44319.
  • the non-woven fabric 90 (Specific Example 9) has a single-layer structure containing thermoplastic fibers and has an uneven shape as shown below. That is, on the first surface (one surface) 1A side, a plurality of vertical ridges 911 protruding toward the first surface 1A side in the thickness direction of the non-woven fabric extend in one direction on the first surface 1A side in a plan view. It is arranged.
  • the vertical ridges 911 are arranged side by side so as to be separated from each other in the other direction on the first surface 1A side in a plan view different from one direction on the first surface 1A side.
  • the horizontal ridges 921 extending in the other direction on the first surface 1A side are arranged by connecting the vertical ridges 911.
  • the vertical ridge portion 911 and the horizontal ridge portion 921 each form a hollow convex portion.
  • the non-woven fabric 90 has a concave-convex shape including a convex portion, a concave portion, and a wall portion 911 W connecting the convex portion and the concave portion by means of the vertical ridge portion 911 and the horizontal ridge portion 921 and the concave portion 922 between them in the thickness direction thereof.
  • the convex portion formed by the vertical ridge portion 911 and the horizontal ridge portion 921 has a length extending along each of the different directions intersecting in the plan view of the non-woven fabric 90.
  • the concave-convex shape on the first surface side of the nonwoven fabric 90 may be a shape in which the convex portions formed by the vertical ridges 911 and the horizontal ridges 921 and the concave portions between them are arranged in a ridge-groove shape. Further, on the second surface (opposite surface) 1B side, it extends in one direction on the second surface 1B side in a plan view and is arranged in another direction on the second surface 1B side different from one direction on the second surface 1B side. A plurality of hollow ridges 931 are arranged. Further, the concave portion 936 sandwiched between the plurality of convex portions 931 extends in one direction on the second surface 1B side.
  • the uneven shape of the non-woven fabric 90 on the second surface 1B side has a shape in which the convex portion 931 and the concave portion 936 are arranged in a ridged groove shape.
  • a plurality of convex portions 934 are connected in a ridge shape, and narrow portions and thick portions are alternately connected and arranged in a plan view.
  • the non-woven fabric 90 has a concave-convex shape including a convex portion, a concave portion, and a wall portion 931W connecting the convex portion and the concave portion by the convex portion 931 and the concave portion 936 in the thickness direction thereof.
  • various configurations described in paragraphs [0012] to [0058] of JP-A-2019-44320 can be adopted.
  • the orientation directions of the fibers forming the vertical ridge portion 911 and the fibers forming the horizontal ridge portion 921 may be different.
  • the height of the vertical ridge portion 911 and the height of the horizontal ridge portion 912 may be different, the horizontal ridge portion 921 may be curved in the thickness direction of the non-woven fabric 90, or the height may be uniform. Further, each of the two lines forming the contour in the width direction of the convex portion 931 viewed from the second surface 1B side in a plan view may be a curve having a plurality of arcs. Fluff may be arranged on the side of the ridge portion 931.
  • the non-woven fabric 90 typically has the shapes shown in FIGS. 14-19. Such a non-woven fabric 90 can be produced by the method described in paragraphs [0059] to [0065] of JP-A-2019-44320.
  • thermoplastic fibers and binders constituting the non-woven fabric of the present invention will be described.
  • thermoplastic fiber those usually used as a material for a non-woven fabric can be adopted without particular limitation.
  • it may be a fiber composed of a single resin component, a composite fiber composed of a plurality of resin components, or the like.
  • the composite fiber include a core sheath type and a side-by-side type.
  • a composite fiber containing a low melting point component and a high melting point component for example, a core-sheath type composite fiber having a sheath having a low melting point component and a core having a high melting point component
  • the temperature is 10 ° C. lower than the melting point of the low melting point component and 10 ° C. lower than the melting point of the high melting point component. ..
  • the core component is large in terms of the cross-sectional area ratio.
  • core-sheath type composite fiber having a sheath having a low melting point component and a core having a high melting point component include a core-sheath type composite fiber having a sheath of PE and a core of PET.
  • the glass transition temperature of the sheath resin component when the glass transition temperature of the sheath resin component is lower than that of the core resin component (hereinafter referred to as low glass transition temperature resin) (for example, the core resin component is PET and the sheath is sheathed.
  • low glass transition temperature resin for example, the core resin component is PET and the sheath is sheathed.
  • binders can be used.
  • acrylic resin, ester resin, vinyl acetate resin, styrene resin, vinyl acetate / ethylene resin, styrene / butadiene rubber and the like can be mentioned.
  • an acrylic resin, styrene-butadiene rubber, or the like is preferable as having viscosity, binding property, and softness capable of restoring the arrangement of the grade separation of the fibers at the fiber intersection.
  • the "acrylic resin” means a polymer containing at least one of a (meth) acrylic acid compound component and a (meth) acrylic acid derivative compound component as a main component as a component of the polymer.
  • the bonding form of the constituent components is not particularly limited, and the acrylic resin may be a block polymer or a random polymer.
  • (Meta) acrylic acid compound means (meth) acrylic acid and salts thereof.
  • the counter ion constituting the salt of (meth) acrylic acid include alkali metal ions such as sodium ion and potassium ion, and alkaline earth metal ions such as magnesium ion and calcium ion.
  • the "(meth) acrylic acid derivative compound” means a compound (monomer) that can be derived from the (meth) acrylic acid compound.
  • Examples of the (meth) acrylic acid derivative compound include (meth) acrylic acid ester, (meth) acrylamide, and (meth) acrylonitrile.
  • the (meth) acrylic acid compound and the derivative compound of (meth) acrylic acid may be used alone or in combination of two or more.
  • (meth) acrylic acid derivative compound used in the non-woven fabric of the present invention (meth) acrylic acid ester or (meth) acrylamide is preferable, and (meth) acrylic acid ester is more preferable.
  • the two hydrogen atoms contained in the nitrogen atom constituting the amide bond may be replaced with an arbitrary substituent such as an alkyl group.
  • This alkyl group may be an unsubstituted alkyl group or an alkyl group having a substituent.
  • the alkyl group having a substituent include an alkyl group having an amino group as a substituent which may be substituted with an arbitrary substituent such as an alkyl group, and an alkyl group having an acyl group as a substituent. ..
  • unsubstituted (meth) acrylamide and alkyl (meth) acrylamide are preferably mentioned.
  • Examples of the (meth) acrylic acid ester include (meth) acrylic acid alkyl ester, polyalkylene glycol (meth) acrylate, (meth) acrylic acid aryl ester and (meth) acrylic acid heteroaryl ester, and (meth) Acrylic acid alkyl esters or polyalkylene glycol (meth) acrylates are preferred.
  • the alkyl group bonded to the oxygen atom constituting the ester bond of the (meth) acrylic acid alkyl ester may be an unsubstituted alkyl group or an alkyl group having a substituent.
  • alkyl group having a substituent examples include an alkyl group having an amino group as a substituent which may be substituted with an arbitrary substituent such as a hydroxyalkyl group and an alkyl group, and an alkyl group having a betaine structure.
  • an alkyl group having a betaine structure examples include a carboxybetaine structure such as a carboxyquaternary ammonium structure is preferable, and a carboxydialkylammonium structure is more preferable.
  • the acrylic resin used for the non-woven fabric of the present invention preferably has (meth) acrylic acid and salts thereof, and constituent components derived from at least one of (meth) acrylic acid esters, and acrylic acid and salts thereof. , And it is more preferable to have a constituent component derived from at least one of the acrylic acid esters.
  • the acrylic resin used for the non-woven fabric of the present invention may have a constituent component derived from a compound (monomer) other than the (meth) acrylic acid compound and the derivative of (meth) acrylic acid, and examples of such a compound include , Ethylene, propylene, isopropylene, vinyl acetate, vinyl chloride, styrene, vinylpyrrolidone, and urethane compounds (monomers having a urethane bond).
  • acrylic resin used in the non-woven fabric of the present invention include (acrylic acid / acrylamide) copolymers such as (acrylic acid / t-butylacrylamide) copolymers and (acrylic acid / acrylamide / ethyl acrylate).
  • (Acrylic acid / acrylamide / acrylic acid alkyl ester) copolymer such as polymer, (alkyl acrylamide / acrylic acid / alkyl aminoalkyl acrylamide / polyethylene glycol methacrylate) copolymer, acrylic acid alkyl ester polymer, methacrylic acid alkyl ester Copolymer, (Acrylic acid / Acrylic acid alkyl ester) copolymer, (Acrylic acid / Acrylic acid alkyl ester) copolymer, (Acrylic acid / Acrylic acid alkyl ester) copolymer, (Acrylic acid / Acrylic acid alkyl ester) copolymer, (Acrylic acid / Alkyl methacrylate) (Acrylic acid alkyl ester / acrylamide) copolymer, (Acrylic acid alkyl ester / acrylamide) copolymer, (Acrylic acid alkyl ester / oc
  • the above-mentioned binder can be used as a binder coating material for non-woven fabrics containing the above-mentioned binder.
  • the binder coating material for a non-woven fabric may consist of only the above-mentioned binder, or may contain other components as long as the above-mentioned characteristics are not impaired.
  • examples of the constituent components of the binder coating material for a non-woven fabric include a solvent, a dispersant for mixing the binder with the solvent, an emulsifier, a solubilizer, and the like, in addition to the above-mentioned binder.
  • the solvent examples include water, alcohols such as ethanol, isopropanol and propylene glycol, glycol ethers such as propylene glycol monomethyl ether and butyl diglycol, and water is preferable from the viewpoint of improving the working environment and preventing fiber deterioration.
  • the content of the binder of the present invention in the binder coating material for a non-woven fabric can be appropriately set as long as the above-mentioned characteristics are not impaired. From the viewpoint of exhibiting recoverability by the elasticity of the binder, the content of the binder of the present invention is preferably 0.5% by mass or more, more preferably 1.0% by mass or more, and the upper limit is 100% by mass.
  • the nonwoven fabric of the present invention it is preferable that the nonwoven fabric has a different basis weight and the thickness intermediate layer has a region having a small basis weight. As a result, the binder adheres to the central portion of the thickness, and the recoverability can be exhibited.
  • the non-woven fabric of the present invention has a core-sheath type thermoplastic composite fiber, the core-sheath ratio (mass ratio) of the fibers is different in the non-woven fabric, and the sheath ratio (mass ratio) is in the thickness intermediate layer. It is preferable that there is a region with a small amount of.
  • Such a non-woven fabric of the present invention can be used for various purposes, for example, for an absorbent article.
  • the absorbent article typically has a front surface sheet arranged on the skin contact surface side, a back surface sheet arranged on the non-skin contact surface side, and an absorber sandwiched between the front surface sheet and the back surface sheet.
  • the nonwoven fabric of the present invention can be suitably used as a surface sheet of an absorbent article such as a diaper, a sanitary napkin, a panty liner, and a urine absorbing pad.
  • the absorbent article is used as a gathered sheet, an exterior sheet, or a wing sheet.
  • the non-woven fabric of the present invention can be used as an eye mask or a constituent member of the mask.
  • the present invention further discloses the following non-woven fabric and absorbent article.
  • a non-woven fabric having a binder and thermoplastic fibers and having fusion points between the fibers. At the center of the thickness of the non-woven fabric, there is a fiber intersection where a fiber having a thickness direction component intersects with another fiber, and the binder is present at the fiber intersection.
  • the binder is a non-woven fabric that meets the requirements of either or both of the following (1) and (2). (1) In a plan view of the non-woven fabric, the abundance area ratio of the binder per unit area is smaller than the fiber area ratio of the portion not covered by the binder. (2) The ratio of the mass of the binder to the mass of the non-woven fabric is 65 percentage points or more smaller than the ratio of the mass of fibers to the mass of the non-woven fabric.
  • ⁇ 2> The non-woven fabric according to ⁇ 1>, wherein the ratio of the mass of the binder to the mass of the non-woven fabric is preferably 78 percentage points or more and 81 percentage points or more smaller than the ratio of the fiber mass to the mass of the non-woven fabric.
  • ⁇ 3> The non-woven fabric according to ⁇ 1> or ⁇ 2>, wherein the non-woven fabric has a larger amount of binder on the opposite surface side than on one surface side of the front and back surfaces and satisfies the requirement (1) on the one surface. .. ⁇ 4>
  • the abundance of the binder on the fiber intersections of at least one of the front and back surfaces of the non-woven fabric is 5% or more and 60% or less per unit area of the non-woven fabric.
  • ⁇ 6> The non-woven fabric according to ⁇ 5>, wherein the abundance of the binder on the fiber intersection is 10% or more, preferably 20% or more, per unit area of the non-woven fabric.
  • ⁇ 7> The non-woven fabric according to ⁇ 5> or ⁇ 6>, wherein the abundance of the binder on the fiber intersection is 50% or less, preferably 35% or less, per unit area of the non-woven fabric.
  • ⁇ 8> The non-woven fabric according to any one of ⁇ 5> to ⁇ 7>, wherein the non-woven fabric is the non-woven fabric that does not come into contact with the skin when the non-woven fabric is used.
  • the abundance of the binder on the fiber intersection at the thickness center portion is 10% or more and 60% or less per unit area of the nonwoven fabric.
  • the non-woven fabric according to any one of.
  • the abundance of the binder on the fiber intersection at the thickness center portion is 20% or more, preferably 30% or more, per unit area of the nonwoven fabric.
  • ⁇ 12> Any one of ⁇ 1> to ⁇ 11>, wherein the abundance of the binder on the fiber intersection when the non-woven fabric is viewed in a plan view is larger on the opposite surface side than on one surface side of the front and back surfaces of the non-woven fabric.
  • the abundance of the binder on the fiber intersections when the non-woven fabric is viewed in a plan view is 10 percentage points or more larger and 15 percentage points or more larger on the opposite surface side than one surface side of the front and back surfaces of the non-woven fabric.
  • ⁇ 14> The non-woven fabric according to any one of ⁇ 5> to ⁇ 13>, wherein the fiber intersection in the abundance of the binder on the fiber intersection is the fusion point.
  • the coating area ratio of the binder on one surface side of the non-woven fabric is 0.9 times or less, preferably 0.6 times or less, and 0.53 times or less of the coating area ratio of the binder on the opposite surface side.
  • the non-woven fabric according to any one of ⁇ 1> to ⁇ 14>, more preferably present.
  • the binder covering area ratio on one surface side of the nonwoven fabric is 0.01 times or more, preferably 0.05 times or more, the binder covering area ratio on the opposite surface side, as described in ⁇ 15>.
  • Non-woven fabric is 0.01 times or more, preferably 0.05 times or more, the binder covering area ratio on the opposite surface side, as described in ⁇ 15>.
  • the area where the binder is present between the fibers (gap) in a state where the fibers are separated by the fiber diameter or more is 15% or less per unit area, preferably 5% or less, more preferably 1% or less, and further.
  • ⁇ 18> The non-woven fabric according to any one of ⁇ 1> to ⁇ 17>, wherein the mass of the binder is 1% or more and 20% or less of the mass of the non-woven fabric.
  • ⁇ 19> The non-woven fabric according to ⁇ 18>, wherein the mass of the binder is 7% or more, preferably 8% or more, of the mass of the non-woven fabric.
  • ⁇ 20> The non-woven fabric according to ⁇ 18> or ⁇ 19>, wherein the mass of the binder is 10% or less, preferably 9% or less, of the mass of the non-woven fabric.
  • non-woven fabric according to any one of ⁇ 1> to ⁇ 20>, wherein the non-woven fabric contains composite fibers having two or more kinds of resin components having different melting points.
  • ⁇ 22> The non-woven fabric according to any one of ⁇ 1> to ⁇ 21>, wherein the degree of longitudinal orientation of the non-woven fabric is 60% or more, preferably 65% or more, and more preferably 70% or more.
  • ⁇ 23> The non-woven fabric according to any one of ⁇ 1> to ⁇ 22>, wherein the degree of longitudinal orientation of the non-woven fabric is 95% or less, preferably 80% or less, and more preferably 75% or less.
  • ⁇ 24> The non-woven fabric according to any one of ⁇ 1> to ⁇ 23>, which has a concave-convex shape including a convex portion, a concave portion, and a wall portion connecting the convex portion and the concave portion in the thickness direction of the non-woven fabric.
  • ⁇ 25> The non-woven fabric according to ⁇ 24>, wherein the binder is present on the wall portion.
  • ⁇ 26> The non-woven fabric according to any one of ⁇ 1> to ⁇ 25>, wherein the non-woven fabric has a different basis weight and has a region having a small basis weight in the thickness intermediate layer.
  • ⁇ 27> The non-woven fabric according to any one of ⁇ 1> to ⁇ 26>, wherein the core-sheath ratio (mass ratio) of the fibers is different in the non-woven fabric, and the thickness intermediate layer has a region having a small sheath ratio (mass ratio).
  • the binder is one or more selected from acrylic resin, ester resin, vinyl acetate resin, styrene resin, vinyl acetate / ethylene resin, and styrene / butadiene rubber, and is preferably acrylic resin or styrene / butadiene. It is a rubber, more preferably an acrylic resin, further preferably a (meth) acrylic acid ester or (meth) acrylamide, and even more preferably a (meth) acrylic acid ester, as described above ⁇ 1> to ⁇ 27. >
  • the non-woven fabric according to any one of.
  • the difference (M2-M1) between the abundance area ratio (M1) of the binder per unit area and the fiber area ratio (M2) which is the portion not covered by the binder is 80 percentage points or more.
  • the difference (M2-M1) between the abundance area ratio (M1) of the binder per unit area and the fiber area ratio (M2) which is the portion not covered by the binder is 99.99%.
  • the concave-convex shape has a solid convex portion, a hollow convex portion, a single-layered fiber layer structure, a two-layered fiber layer structure, and the convex portions arranged in a scattered pattern in the plane direction.
  • the non-woven fabric according to any one of ⁇ 24> to ⁇ 30> which has a structure of 1 selected from those having protrusions and recesses arranged in a ridge shape, or a structure in which a plurality of them are combined. .. ⁇ 32>
  • the non-woven fabric according to any one of ⁇ 1> to ⁇ 31> which has a shape concavo-convex on both sides.
  • a non-woven fabric having one surface of the front and back surfaces of the non-woven fabric and the opposite surface on the opposite side to the one surface. It has an outer fiber layer on one side and the opposite side, and a plurality of connecting portions arranged between the outer fiber layer on the one side and the outer fiber layer on the opposite side. 4. The method according to any one of ⁇ 1> to ⁇ 32>, wherein some fibers are fused to each other between the outer fiber layer on one surface side, the outer fiber layer on the opposite surface side, and the connecting portion.
  • Non-woven fabric is any one of ⁇ 1> to ⁇ 32>, wherein some fibers are fused to each other between the outer fiber layer on one surface side, the outer fiber layer on the opposite surface side, and the connecting portion.
  • the convex portion formed by the outer fiber layer on one surface side and the concave portion between them have a concave-convex shape arranged in a ridge shape, and the convex portion formed by the outer fiber layer on the opposite surface side and the concave portion between them are formed.
  • the non-woven fabric according to ⁇ 33> which has an uneven shape arranged in a ridge shape.
  • a plurality of vertical ridges protruding toward one surface side in the thickness direction of the non-woven fabric extend in one direction on one surface side in a plan view, and one in a plan view different from one direction on the one surface side.
  • the non-woven fabric according to ⁇ 35> which has a concavo-convex shape in which convex portions formed by each of the vertical ridges and horizontal ridges on one surface side and concave portions between them are arranged in a ridge groove shape.
  • the convex portion has a convex portion extending in one direction, and the convex portion has a shape in which a plurality of convex portions are connected in a ridge shape and narrow portions and thick portions are alternately connected in a plan view.
  • the apparent thickness of the nonwoven fabric under a load of 50 Pa is 1.3 mm or more and 15 mm or less, preferably 1.5 mm or more, more preferably 2.0 mm or more, further preferably 3.0 mm or more, and further preferably 4.5 mm or more.
  • the basis weight of the nonwoven fabric 10 g / m 2 or more 60 g / m 2 or less, preferably 15 g / m 2 or more, 20 g / m 2 or more, and further preferably 25 g / m 2 or more and, 55 g /
  • the non-woven fabric according to any one of ⁇ 1> to ⁇ 38>, wherein m 2 or less is preferable, 50 g / m 2 or less is more preferable, and 48 g / m 2 or less is further preferable.
  • ⁇ 41> It has a front sheet arranged on the skin contact surface side, a back sheet arranged on the non-skin contact surface side, and an absorber sandwiched between the front sheet and the back sheet.
  • ⁇ 42> The absorbent article according to ⁇ 41>, wherein the side opposite to one of the front and back surfaces of the non-woven fabric is the side that does not come into contact with the skin.
  • Example 1 (1) Preparation of Raw Material Nonwoven Fabric Using the core-sheath type thermoplastic composite fiber having the fiber diameter shown in Table 1, the raw material non-woven fabric having an uneven shape shown in FIGS. 14 to 19 was prepared by an air-through method. The size of the raw material non-woven fabric was 100 mm ⁇ 100 mm. Specifically, it was produced based on the production method described in paragraphs [0059] to [0065] of Patent Document 4. At this time, the first blowing treatment with hot air was performed under the conditions of a temperature of 160 ° C., a wind speed of 54 m / sec, and a blowing time of 6 seconds.
  • the second hot air blowing treatment was performed under the conditions of a temperature of 160 ° C., a wind speed of 6 m / sec, and a blowing time of 6 seconds.
  • the binder coating solution was prepared by mixing a binder solution having a solid content of about 50% to 10% by mass and deionized water to 90% by mass.
  • a highly elastic type was used as the binder (Boncoat AB-886 (trade name, manufactured by DIC Corporation), pH 6.6, viscosity 40 mPa ⁇ s, glass transition point -40 ° C, component: acrylic.
  • the binder coating liquid was evenly applied to the raw material non-woven fabric by spraying onto the second surface (opposite surface) 1B on which the convex portions 931 and the concave portions 936 were arranged.
  • the coating amount of the binder coating liquid was 3.5 g / m 2 . This was measured by the change in the mass of the non-woven fabric before and after the binder was applied.
  • the non-woven fabric sample A1 of Example 1 having the basis weight shown in Table 1 was prepared. The binder adhered to the center of the thickness of the non-woven fabric, and was present so as to adhere particularly to the fiber intersections.
  • Example 2 The non-woven fabric sample A2 of Example 2 was prepared in the same manner as in Example 1 except that the basis weight was as shown in Table 1. The binder adhered to the center of the thickness of the non-woven fabric, and was present so as to adhere particularly to the fiber intersections.
  • Example 3 The non-woven fabric sample A3 of Example 3 was prepared in the same manner as in Example 1 except that the fiber diameter and the basis weight were as shown in Table 1.
  • Example 4 In the manufacturing methods described in paragraphs [0059] to [0065] of Patent Document 4, the apparent thickness and basis weight of the non-woven fabric under a load of 50 Pa are shown in Table 1 by changing the height of the protrusions of the support to 6.0 mm. As shown, the non-woven fabric sample A4 of Example 4 was prepared in the same manner as in Example 1 except that the bulk was lower than that of Example 1.
  • Example 5 As the raw material non-woven fabric, the non-woven fabric of Example 5 is produced by the same method as in Example 1 except that it is produced by the production method described in paragraphs [0049] to [0057] of Patent Document 3 using the support shown in FIG. Sample A5 was prepared.
  • the non-woven fabric sample A5 has an uneven shape shown in FIG.
  • the support male material 120 shown in FIG. 20 a square pillar shape having a prismatic shape and a square shape of 2 mm ⁇ 2 mm when viewed from the upper surface was used, in which the height of the protrusion 121 was 8 mm.
  • the pitch of the prism was 5 mm in each of the MD direction and the CD direction.
  • a metal material having a grid-like protrusion 131 corresponding to the recess 122 of the support male material 120 was used.
  • the protrusion 131 of the female support member 130 was pushed between the protrusions 121 of the male support member 120.
  • the adjacent protrusions 121 and 121 of the support female material 130 are arranged at a pitch of 5 mm, and the space where the fibers enter when the support male material 120 and the support female material 130 are pushed is 0.5 mm on one side. There was a total of 1 mm on both sides of the protrusion 120 of the support male material 120.
  • the blowing treatment with hot air was performed under the conditions of a temperature of 160 ° C., a wind speed of 6 m / sec, and a blowing time of 6 seconds.
  • Example 6 A non-woven fabric sample A6 of Example 6 was prepared in the same manner as in Example 1 except that Sumikaflex 730 (trade name, manufactured by Sumika Chemtex Co., Ltd.) ethylene-vinyl acetate copolymer emulsion was used as the binder.
  • Sumikaflex 730 trade name, manufactured by Sumika Chemtex Co., Ltd.
  • ethylene-vinyl acetate copolymer emulsion was used as the binder.
  • the non-woven fabric sample A7 of Example 7 was prepared.
  • Example 8 A fiber web formed of 1.2 dtex thermoplastic fibers composed of concentric core-sheath type composite fibers (core-sheath ratio 50% by mass: 50% by mass) in which the core component shown in Table 1 is PET and the sheath component is PE.
  • the core component is PET
  • the sheath component is PE
  • it is composed of concentric core-sheath type composite fibers (core-sheath ratio 50% by mass: 50% by mass).
  • a fiber web (hereinafter referred to as "2.0 dtex fiber web”) formed of 0 dtex thermoplastic fiber was prepared.
  • a heat treatment step of blowing hot air by an air-through method under the conditions of a temperature of 140 ° C., a wind speed of 6 m / sec, and a blowing time of 6 seconds was performed to prepare a raw material non-woven fabric.
  • the heat treatment was performed so that the 2.0 dtex fiber web side of the laminated web became the spray surface.
  • the 1.2dtex fiber web side of the obtained raw material non-woven fabric was used as the binder coating surface, and the binder coating liquid was sprayed in the same manner as in Example 1 to prepare the non-woven fabric sample A8 of Example 8.
  • Comparative Example 1 Using the core-sheath type thermoplastic composite fiber having a fiber diameter shown in Table 2, a non-woven fabric having a concavo-convex shape described in Example 1 of Patent Document 2 was produced by an air-through method. The basis weight is as shown in Table 2. The non-woven fabric sample C1 of Comparative Example 1 was used as it was without applying the binder coating liquid to the non-woven fabric.
  • Comparative Example 2 Using the core-sheath type thermoplastic composite fibers having the fiber diameters shown in Table 2, a flat non-woven fabric having no unevenness was produced by an air-through method. The basis weight is as shown in Table 2. The non-woven fabric sample C2 of Comparative Example 2 was used as it was without applying the binder coating liquid to the non-woven fabric.
  • Example 3 Using the fibers (PET) having the fiber diameters shown in Table 2, the resin-bonded nonwoven fabric described in Example 1 of Patent Document 1 was produced.
  • the binder coating liquid (coating liquid of Boncoat AB-886) used in Example 1 described above was spray-coated using the resin bond coating liquid.
  • the coating amount was 16.6 g / m 2 .
  • This resin-bonded non-woven fabric was used as the non-woven fabric sample C3 of Comparative Example 2.
  • the non-woven fabric sample C3 had a flat shape without having an uneven shape.
  • Comparative Example 4 Take out the non-woven fabric placed on the back of the surface sheet from the M size tape diaper of The Procter & Gamble Company Pampers ultra-thin dry (obtained in May 2018) sold in China and put it in a beaker of 100 mL of ethyl acetate. The non-woven fabric sample was put in and stirred for 30 minutes, and then the non-woven fabric sample was taken out and dried. The non-woven fabric thus obtained was used as the non-woven fabric sample C4 of Comparative Example 4. The non-woven fabric sample C4 had a flat shape without having an uneven shape.
  • Comparative Example 5 A non-woven fabric sample C5 of Comparative Example 5 was prepared based on Example 1 described in JP-A-2012-136803.
  • Comparative Example 6 The non-woven fabric sample C6 of Comparative Example 6 was prepared by the same method as in Example 5 except that the binder was not applied.
  • Comparative Example 7 The non-woven fabric sample C7 of Comparative Example 7 was prepared by the same method as in Example 1 except that the binder was not applied.
  • Comparative Example 8 The non-woven fabric sample C8 of Comparative Example 8 was prepared by the same method as in Example 8 except that the binder was not applied.
  • the measurement was performed based on the method for measuring the abundance of the binder on the fiber intersections in the part), and the abundance of the binder on the fiber intersections was calculated based on the above formula (S1). That is, the abundance of the binder on the fiber intersections on the first and second surfaces and the abundance of the binder on the fiber intersections at the center of the thickness of the nonwoven fabric in the plan view of the nonwoven fabric were measured and calculated.
  • (IV) Measurement of Covered Area Ratio and Covered Area of Binder The covering area (Ka) and the covering area ratio (K) of the binder on the first and second surfaces of the non-woven fabric of the binder are the above-mentioned (non-woven fabric when viewed in a plan view).
  • VII Texture Measurement method of MMD (variation of average friction coefficient) Using an automatic surface tester (KES-FB4-A-SE: manufactured by Kato Tech Co., Ltd.), fluctuation of the average friction coefficient of the surface of the non-woven fabric (MMD) was measured.
  • a 100 mm ⁇ 100 mm test piece was prepared and mounted on a test table on a smooth metal surface. The contact surface was crimped to the test piece with a force of 49 cN, and the test piece was moved horizontally by 2 cm at a constant speed of 0.1 cm / sec. A uniaxial tension of 19.6 cN / cm was applied to the test piece.
  • the contact was made by arranging 20 piano wires having a diameter of 0.5 mm and bending them into a U shape with a width of 10 mm, and the contact surface was crimped to the test piece with a force of 49 cN by a weight.
  • the measured value of the mean deviation of the coefficient of friction is represented by the MMD value. This measurement was performed for both MD and CD, and the average value was calculated by the following formula (S2), which was used as the average deviation of the friction coefficient.
  • Mean deviation of friction coefficient ⁇ (MMD MD 2 + MMD CD 2 ) / 2 ⁇ 1/2 (S2)
  • S2 Mean deviation of the coefficient of friction indicates the degree of variation in friction, and the smaller the value, the higher the smoothness when touched by hand.
  • the non-woven fabric was compressed so as to have a thickness of 0.7 mm, for example, by biting a spacer. After holding this compressed state in an atmosphere of 50 ° C. for 24 hours, it was released from the compressed state and left in an atmosphere of 25 ° C. for 30 minutes. After that, a laser thickness gauge was used to measure the thickness under a load of 50 Pa. Three points were measured, and the average value was used as the measurement data to obtain the "apparent thickness of the non-woven fabric after compression and release". Finally, the recovery rate of the apparent thickness of the non-woven fabric was calculated by the following formula.
  • Recovery rate [%] of apparent thickness of non-woven fabric after compression release "Appearance thickness of non-woven fabric after compression release (mm) -0.7” ⁇ "Appearance thickness of non-woven fabric before compression (mm)” x 100 Further, the thickness "apparent thickness of the non-woven fabric after compression / release (mm) -0.7" recovered after compression to 0.7 mm is defined as the recovery amount.
  • the non-woven fabric samples of Examples 1 to 5 did not contain a binder, and Comparative Examples 1 and 2 and While exhibiting a sufficient texture equivalent to that of the non-woven fabric samples of 6 to 8, it was superior to the non-woven fabric samples of Comparative Examples 1, 2 and 6 to 8 in terms of the thickness recovery property indicated by the compression recovery rate and the amount of recovery.
  • the non-woven fabric sample of Example 1 showed a sufficient texture equivalent to that of the non-woven fabric of Comparative Example 7 in which the same non-woven fabric raw material did not contain a binder, and the compression recovery rate was higher than that of the non-woven fabric sample of Comparative Example 7.
  • the non-woven fabric sample of Example 5 showed the same texture as the non-woven fabric of Comparative Example 6 in which the same non-woven fabric raw material did not contain a binder, and the compression recovery rate was about 1. as compared with the non-woven fabric sample of Comparative Example 6. It was 4 times, and the amount of recovery was about 1.4 times, showing excellent thickness recovery.
  • the flat-shaped non-woven fabric sample of Comparative Example 2 had a high compression recovery rate to some extent due to the small initial thickness, but the recovery amount was small and had a large thickness like the non-woven fabric samples of Examples 1 to 5. It did not show recovery behavior.
  • non-woven fabric samples of Examples 1 to 5 show a compression recovery rate equal to or higher than that of the non-woven fabric samples of Comparative Examples 3 to 5 containing a binder, and the recovery amount is 3 with respect to the non-woven fabric samples of Comparative Examples 3 to 5. It was more than doubled, and was superior to the non-woven fabric samples of Comparative Examples 3 to 5 in terms of texture.
  • the non-woven fabric samples of Examples 6 and 7 have a compression recovery rate and a compression recovery rate as compared with the non-woven fabric samples of Comparative Examples 1 to 8 while maintaining a sufficient texture even if the binder is changed from the non-woven fabric sample of Example 1.
  • the amount of recovery was high, showing excellent thickness recovery.
  • the non-woven fabric of Example 8 had an extremely thin apparent thickness of 1.5 mm and had no unevenness, but maintained a better texture than the non-woven fabric samples of Comparative Examples 3 to 5 containing a binder. rice field. Further, the non-woven fabric of Example 8 showed a higher compression recovery rate than the non-woven fabric of Comparative Example 8 in which the same non-woven fabric raw material did not contain a binder.
  • the terminal for measuring friction receives an irregular adhesive force derived from the binder on the fiber surface, and the fluctuation of the average friction coefficient becomes large. Further, when the fibers are strongly bonded to each other by the binder and hardened, when the terminal picks up the frictional force on the surface of the non-woven fabric, it cannot be flexibly deformed and the frictional force to the terminal fluctuates. Micro phenomena such as hardening and stickiness of fibers caused by these make a big difference in texture.
  • the difference in MMD values shown in Tables 3 and 4 means a significant difference in texture as a delicate skin surface sensation, even if the numerical value is small.
  • the non-woven fabric samples of Examples 1 to 8 have realized excellent texture and thickness recovery which cannot be obtained with the non-woven fabric samples of Comparative Examples 1 to 8.
  • Examples 1 and 4 showed superior effects on the compression recovery rate and the amount of recovery as compared with Examples 2, 3 and 5.
  • the basis weight is suppressed and the amount of fibers is small as compared with Example 2, so that the degree of longitudinal orientation is high and the proportion of the binder that can adhere to the fibers having the thickness direction component is also large. It is considered that the excellent effect was obtained as described above.
  • Fiber intersection 7 Fiber 8 Binder 10, 20, 30, 40, 50, 60, 70, 80, 90

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Citations (5)

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