WO2013084752A1 - Sheet and absorbent article using same - Google Patents

Sheet and absorbent article using same Download PDF

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Publication number
WO2013084752A1
WO2013084752A1 PCT/JP2012/080621 JP2012080621W WO2013084752A1 WO 2013084752 A1 WO2013084752 A1 WO 2013084752A1 JP 2012080621 W JP2012080621 W JP 2012080621W WO 2013084752 A1 WO2013084752 A1 WO 2013084752A1
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WO
WIPO (PCT)
Prior art keywords
sheet
constricted
protrusion
sheet according
surface side
Prior art date
Application number
PCT/JP2012/080621
Other languages
French (fr)
Japanese (ja)
Inventor
猛史 宮村
泰樹 内山
宏子 川口
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.)
Filing date
Publication date
Application filed by 花王株式会社 filed Critical 花王株式会社
Priority to RU2014127656/12U priority Critical patent/RU151697U1/en
Priority to CN201290000928.4U priority patent/CN203915238U/en
Publication of WO2013084752A1 publication Critical patent/WO2013084752A1/en

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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51Absorbent 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
    • A61F13/511Topsheet, i.e. the permeable cover or layer facing the skin
    • A61F13/51104Topsheet, i.e. the permeable cover or layer facing the skin the top sheet having a three-dimensional cross-section, e.g. corrugations, embossments, recesses or projections

Definitions

  • the present invention relates to a sheet with protrusions and an absorbent article using the same.
  • Patent Document 1 discloses a laminated sheet having a protruding portion extending in a streak shape on one side of a sheet material and having a cross-section (substantially semicircle) in cross section. Thereby, it is supposed that it can be used, for example as a cushioning surface sheet.
  • Patent Document 2 discloses a sheet having a large number of frustoconical protrusions protruding from one side of the sheet as embossed sheets as a sheet having a high compression recovery rate.
  • Patent Document 3 is a sheet composed of a two-layer sheet that does not substantially expand and contract, and the upper sheet has a large number of rectangular parallelepiped protrusions. A surface sheet of an absorbent article having a space between the two is disclosed. With this sheet, it is supposed that the liquid can be captured in the closed hollow portion in the convex portion, and the liquid leakage prevention and concealing properties are improved.
  • the present invention projects to the first surface side on the side of the sheet in plan view, and has a first projecting portion having an internal space, projects to the second surface side opposite to the first surface side, and A second projecting portion having a space, and the first projecting portion and the second projecting portion continuously extend in the sheet plane direction through the wall portions alternately in different directions intersecting in plan view of the sheet.
  • the internal space of the first protrusion is opened to the second surface side, the internal space of the second protrusion is open to the first surface side, and the second space extends from the top of the first protrusion.
  • the wall portion connected to the top portion of the protruding portion provides a sheet having a portion constricted toward the internal space of the second protruding portion.
  • FIG. 3 is an enlarged cross-sectional view taken along line III-III in the sheet of FIG.
  • FIG. 4 is an enlarged cross-sectional view taken along the line IV-IV in the sheet of FIG. 1.
  • the present invention relates to a sheet excellent in cushioning and deformability and having good air permeability. Moreover, this invention relates to the absorbent article excellent in the excretion collection property using the said sheet
  • the inventors of the present invention have conducted extensive research and development for the purpose of searching for a form different from the above-described conventional one and providing a sheet capable of imparting a property different from the conventional one and a better function. Specifically, the production and properties / functions of continuous sheets having portions protruding on both the front and back surfaces as well as on one side of the sheet material were examined. The present invention has been completed based on these findings.
  • FIG. 1 is a partial cross-sectional perspective view schematically showing a main part of a sheet as a preferred embodiment of the present invention.
  • 2 is an enlarged view of a region II in the sheet of FIG. 1
  • FIGS. 3 and 4 are enlarged sectional views showing a section taken along line III-III and a section taken along line IV-IV, respectively.
  • the sheet 10 is preferably applied as a sheet member of an absorbent article such as a sanitary napkin or a disposable diaper, and the first surface side z 1 (see FIG. 2) is used toward the wearer's skin surface. it is preferable to use by placing the second adhesive surface z 2 to the article inside of the absorber (not shown) side.
  • the present invention is limited and interpreted by this Absent.
  • the sheet 10 according to the present embodiment has a large number of first protrusions 1 obliquely intersecting with each other in two vertical and horizontal directions on the first surface side when the sheet 10 is viewed in plan.
  • the arrangement is extended (hereinafter, this arrangement may be referred to as an oblique grid arrangement).
  • the lattice arrangement may be orthogonal (90 °), and in that case, the lattice arrangement may be distinguished as an orthogonal lattice arrangement.
  • the sheet 10 is formed with a number of second projecting portions 2 projecting to the second surface side opposite to the first surface side.
  • the second protrusions 2 are also arranged in an oblique grid pattern, but may be an orthogonal grid pattern. Since the preferable range of the crossing angle is determined along with the first protrusion 1, it is the same as described above.
  • the first projecting portion 1 and the second projecting portion 2 project in directions opposite to each other with respect to the sheet surface.
  • the 1st protrusion part 1 and the 2nd protrusion 2 are distribute
  • s 1 direction and s in two directions the first projecting portion 1 and the second protrusion 2 are continuously arranged in the sheet plane direction alternately.
  • the first protrusions and the second protrusions 2 are not located at the same position, that is, they are arranged alternately so as not to overlap (see FIG. 2).
  • the first projecting portion 1 and the second projecting portion 2 that are arranged to extend in the first direction (x direction) and the second direction (y direction) in the plane are continuous without contradiction in the sheet plane direction.
  • seat 10 is comprised.
  • continuous without contradiction means that when a specific shape portion is continuous and becomes planar, it is not refracted or discontinuous, and the whole is continuous with a gentle curved surface.
  • the “continuous” means that the sheet material is formed without any substantial breakage of the sheet material, for example, there are no interrupted portions or hole regions partially lacking the sheet material. Means. However, micropores such as interfiber pores are not included in the pore region. When distinguishing this, for example, the hole region can be defined as having a circle equivalent diameter of 1 mm or more.
  • the term “continuous” includes a laminated sheet. In the present embodiment, a single-layer sheet that is not laminated is shown as a preferred embodiment. Further, the meaning of the word “continuous” can also be expressed as the surface on the first surface side z 1 and the surface on the second surface side z 2 of the nonwoven fabric being substantially continuous.
  • substantially continuous here means that, as described above, the pores may be included and the micropores may be smaller than that without impairing the effects of the present invention.
  • the arrangement form of the first protrusions and the second protrusions is not limited to the above, and may be any form that can be arranged in an arrangement that can be continued without contradiction.
  • six second protrusions may be arranged at the apexes of the hexagon, and the pattern may be spread in the plane.
  • the second protrusions are adjacent to each other.
  • Such an arrangement is included in the meaning that the first protrusions and the second protrusions are arranged alternately.
  • the first projecting portion 1 and the second projecting portion 2 have a truncated cone shape or hemispherical shape with rounded top portions 11 and 21. More specifically, the protruding shape of the first protruding portion 1 is not sharp but rather hemispherical, while the protruding shape of the second protruding portion 2 is sharper and the top 21 has a round cone. It has a truncated cone shape.
  • the protruding portion is not limited to the above shape, and any protruding shape may be used. For example, various cone shapes (in this specification, the cone shape is a cone, a truncated cone, a pyramid, a pyramid It is practical to include a table, a slanted cone, etc.).
  • the first projecting portion 1 and the second projecting portion 2 hold frustoconical or hemispherical internal spaces 18 and 28 having rounded tops similar to the outer diameter thereof.
  • the internal space 18 of the 1st protrusion part 1 is open
  • the internal space 28 of the 2nd protrusion part 2 is open
  • each internal space 18 and 28 is separated through the ridge part 6, and is formed as a space which is not substantially continuous (refer FIG. 2).
  • a wall portion 3 is formed between the first protruding portion 1 and the second protruding portion 2 in the sheet thickness direction, and both protruding portions are continuous through the wall portion 3 or the ridge portion 6. It is structured.
  • the wall 3 is a portion that connects the first protrusion 1 and the second protrusion 2.
  • the wall 3 is not clearly distinguished from the two protrusions but is a skirt extending from the tops 11 and 21 of the two protrusions. That is, the wall part 3 is a shared part of both protrusion parts, and is a part of both protrusion parts. Moreover, the wall part 3 is a part which separates the internal space 18 of the 1st protrusion part 1, and the internal space 28 of the 2nd protrusion part adjacent to this, and is also a part which makes the outer edge of both internal space.
  • FIG. 5 is a drawing-substituting photograph in which a cross section of the sheet 10 of the present embodiment is imaged.
  • region of the narrow part 7 is shown with the dashed-dotted line, and the code
  • the constricted portions 7 are preferably formed in pairs at least at two places.
  • the pair of constricted portions 7 are literally portions (B) narrower than the width (A) of the cross-sectional parabola of the second projecting portion 2.
  • the width (B) is the distance between the inner walls at a position where the pair of constricted portions 7 and 7 are closest to each other, and the width (A) is the widest width between the wall portions 3 near and below the constricted portion 7. It is the distance between the inner walls of the part.
  • a form as shown in FIG. FIG. 6 is an enlarged cross-sectional view schematically showing an enlarged cross section in the thickness direction of the second protrusion 2 and the internal space 28 thereof.
  • the cross-sectional shape of the second protrusion 2 is a parabola, and the constricted part 7 is narrower (B 1 ) than the width (A 1 ) of the second protrusion.
  • the vicinity of the top portion 21 has a swelled shape, and the constricted portion 7 is narrower (B 2 ) than the width (A 2 ) of the second protruding portion.
  • FIG 6 (c) has a shape in the vicinity of the top portion 21 is smaller than the upper, constricted portion 7 relative to the width of the second projecting portion (A 3) is narrower (B 3).
  • the ratio (B / A) of each cross-sectional width is preferably 0.2 to 0.9, and more preferably 0.4 to 0.8. From the viewpoint of liquid permeability, 0.2 or more is preferable, and from the viewpoint of cushioning property, 0.8 or less is preferable.
  • the widths (A) and (B) in the sheet thickness (T) section of the second projecting portion 2 passing through the pair of constricted portions 7, the area around the top portion 21 of the second projecting portion 2. It is defined as a relationship in which the constricted portion 7 is arranged inside the curve u based on the curvature. That is, the narrow portion 7 is defined as narrower than the width formed by the curve u.
  • the width formed by the curve u is the width at the narrow (B) height position of the constricted portion 7 (see FIG. 6). Referring to FIG. 6 as an example of this definition, in FIG.
  • the curve u matches the shape of the entire second protrusion 2 and the constricted portion 7 with respect to the width (A 11 ) of the wall 3. Is narrow (B 1 ).
  • the width of the curve u is wider than the width of the wall portion extending from the top portion 11. That is, it is a drawstring shape in which the vicinity of the top 21 of the internal space 28 of the second protrusion 2 is enlarged.
  • the constricted portion is narrow (B 2 ) with respect to the width (A 21 ) of the curve u.
  • the width of the curve u is narrower than the width of the wall portion extending from the top portion 11.
  • the constricted portion is narrow (B 3 ) with respect to the width (A 31 ) of the curve u.
  • the constricted part 7 is arranged so that the internal space 28 is squeezed at the upper part with respect to the space area around the top part 21 of the internal space 28 of the second projecting part 2.
  • the ratio (B 1 / A 11 ) in FIG. 6A and the ratio (B 3 / A 31 ) in FIG. 6C are preferably 0.15 to 0.85, and 0.3 to 0 More preferred is .75.
  • the ratio (B 2 / A 21 ) in FIG. 6B is preferably from 0.1 to 0.8, and more preferably from 0.25 to 0.7. From the viewpoint of liquid permeability, 0.15 or more is preferable, and from the viewpoint of cushioning property, 0.85 or less is more preferable.
  • the constricted part 7 can be arranged at an arbitrary height with respect to the sheet thickness (T) in the wall part 3 connecting the top part 11 of the first projecting part 1 and the top part 21 of the second projecting part 2.
  • the constricted portion 7 is arranged in the range closer to the top of the regions P 2 to P 3 or the boundary between the region p ′ 2 and the region p ′ 3 where the curvature of the top portion 21 changes. It is preferable (see FIG. 2). Further, in the definition of the following two sections, it is preferable that the constricted portion 7 is arranged on the half thickness t 2 side of the center line (center plane) m or m ′ (see FIG. 2).
  • the ratio (T 7 / T) of the height (T 7 ) from the top 21 of the constricted part 7 to the sheet thickness (T) is preferably 0.1 to 0.9, 0.2 ⁇ 0.8 is preferred. From the viewpoint of cushioning properties, 0.1 or more is preferable, and from the viewpoint of cushioning properties or touch, 0.9 or less is preferable.
  • the region P ′ 2 and the curved and rounded region can be classified as P 1 and P ′ 3 , respectively. That is, the radius of curvature of the top 21 of the second protrusion top 2 is larger than the radius of curvature of the top 11 of the first protrusion 1 (the curvature is small).
  • This latter section can also be applied in FIG. 6C, in which the radius of curvature of the top portion 21 of the second protruding portion top portion 2 is smaller than the radius of curvature of the top portion 11 of the first protruding portion top portion 1 (the curvature is large).
  • the half thickness (t 1 ) on the first surface side and the half thickness (t 2 ) on the second surface side are the same as described above.
  • the line obtained by dividing the sheet thickness (T) into two equal parts is the center line ( It is assumed that the center plane is m and the thicknesses (t 1 , t 2 ) are equal.
  • the definition is made by dividing the position by the position m ′ evaluated as the center of the straight section of the wall portion. can do.
  • the half thickness t 1 on the first surface side ⁇ the half thickness t 2 on the second surface side.
  • the constricted part 7 may be in a part of the circumferential direction of the surface of the wall part 3 or may be in the entire circumference. In the case where it is in a part, it is preferable to be at two places facing each other through at least the internal space 28.
  • each constricted portion 7 has a predetermined shape on the curved surface of the wall portion 3 forming the second projecting portion 2 as shown in FIGS. It may be formed in a stripe shape in the width, or may be formed in a dot shape as shown in FIG. In FIG.
  • the constricted portion 7 approximates the semicircular length of the outer periphery of the wall 3 but is shorter than that, and in FIG. 7 (b), the constricted portion is shorter than that of (a).
  • the constriction is formed in a streak shape with a predetermined width as shown in FIGS. 7 (a) and (b). preferable.
  • the semicircular length of the outer periphery of the second projecting portion 2 at the height position where the constricted portion 7 is disposed is (C)
  • the peripheral length of the constricted muscle of the constricted portion 7 is (D).
  • these ratios (D / C) are preferably 0.2 to 0.9, more preferably 0.3 to 0.8, from the viewpoint of cushioning properties and the like.
  • the sheet 10 has portions (first and second protrusions) protruding on both sides as well as on the front and back sides.
  • the top part 11, the top part 21, and the periphery thereof are shaped like a convex lens with roundness. Therefore, even if the sheet 10 is pressed in the sheet thickness (T) direction, the force is distributed between the protruding portions on both sides, and the cushioning characteristic peculiar to the structure is exhibited.
  • the sheet 10 is formed with the constricted portion 7 that enters the inner space 28 of the second projecting portion 2 in the wall portion 3.
  • the constricted portion 7 has an effect of dispersing and relaxing the pressing in the sheet thickness (T) direction.
  • the pressure from the first projecting portion 1 side tries to reach the top portion 21 of the second projecting portion 2 from the top portion 11 through the wall portion 3, but the stress is distributed at the curved portion of the constricted portion 7.
  • the stress propagation to the second protrusion 2 is alleviated.
  • the seat 10 becomes difficult to sag and an excellent cushioning property is obtained.
  • the constricted portion 7 exhibits the spring property against the force in the plane direction, and the sheet 10 is excellent in elastic deformation and shape recoverability at the time of weight removal.
  • the constricted portion 7 is preferably a rounded shape with as few corners as possible. Thereby, even if it repeats, a stress is not easily concentrated on the constriction part 7, but it is relieve
  • the sheet 10 there are open internal spaces on the first surface side and the second surface side.
  • this sheet 10 When this sheet 10 is applied to an absorbent article, a large number of opened internal spaces can diffuse moisture generated from the wearer, while effectively diffusing vapor emanating from the absorber side.
  • the sheet 10 Since the sheet 10 has the internal spaces 18 and 28, when used as a sheet member of the absorbent article, the sheet 10 can collect and deal with these in various forms according to the physical properties of the excretory liquid and excrement. For example, when explained by assuming that the first surface z 1 of the sheet 10 of Figure 1 and the skin face side, if a low excrement viscosity high permeability, its excrement temporary internal space 28 is Stock Is done.
  • the constricted portion 7 is preferably deformed into a laminated thickness portion 71 in which the sheet material is folded without spreading in the plane direction even under high pressure.
  • the constricted portion 7 becomes a triple laminated thickness portion 71 as shown in FIG. Since the laminated thickness portion 71 forms a certain height in the thickness direction, the internal spaces 18 and 28 remain even partially. Thereby, air permeability is maintained, a liquid holding region remains, and liquid outflow is suppressed.
  • the sheet thickness is thinner than the pitch length between the protrusions on the sheet, and is less than a quarter of the pitch length between the protrusions on the sheet. Thickness is preferred.
  • the sheet 10 has first and second protrusions in both directions, and the top is rounded. Therefore, when the skin comes into contact with the sheet 10, a soft and good touch is realized with respect to the skin.
  • the contact point with the pressure at the time of mounting increases or decreases in a planar shape, making it possible to suppress the shape deformation of the entire sheet with respect to the pressure while reducing the shape deformation from the pressure deformation. Can be easy.
  • action resulting from said favorable cushioning property and a unique favorable touch is obtained with the effect
  • the point contact mentioned above has an effect also when excretion etc. are received, and the smooth touch is implement
  • the compression hardness (LC) is preferably 0.01 to 0.35, Furthermore, it is 0.05 to 0.3, more preferably 0.1 to 0.25. Since the compression hardness (LC) is in the above range, the sheet 10 can have an appropriate gap, and can achieve high absorption performance while maintaining flexibility.
  • the compression hardness (LC) of the sheet can be measured using a texture measurement system KES-FB3-AUTO-A (trade name, manufactured by Kato Tech Co., Ltd.).
  • the measurement settings are: sensitivity 2, compression speed 50 seconds / mm, data capture sensation 0.1 seconds, pressurization area 2 cm 2 (attached jig), and the size of the sheet to be measured is 15 cm ⁇ 15 cm And placed in the center of the measuring table. Three points are measured according to the standard setting of the measuring instrument, and the average value is obtained as the measured value.
  • FIG. 9 is an explanatory diagram schematically showing the relationship between the first protrusion and the second protrusion in plan view.
  • a model in which the first protrusion 1 and the second protrusion are arranged extending in the first direction (x) and the second direction (y) in the plane is shown (the x direction and the y direction are one point) Including the direction illustrated by the chain line and the direction in which it is translated).
  • Each of the first protrusion 1 and the second protrusion 2 (broken line) indicated by a circle indicates a schematic position in plan view, and its center substantially coincides with the apex of the top.
  • the sheet 10 is a schematic view of the deformed state of the nonwoven fabric when the contact plane is viewed as a hard member (for example, a metal base and a pressing plate) as described above, or actually pressed using a predetermined pressure. It is explanatory drawing shown in. The field of view is similar to the cross section shown in FIG. 2, but is simplified.
  • the sheet 10 maintains the internal spaces 18 and 28 between the pressing surface and the sheet even when the nonwoven fabric is pressed in the surface direction with a pressure of 50 gf / cm 2 by the non-deformable pressing surface. It is preferable. Such maintainability of the internal space may be only on the first surface side or the second surface side.
  • the pressure of 50 gf / cm 2 is a pressure corresponding to the pressure when the infant is seated when applied to an actual absorbent article, for example.
  • the measurement of pressure was performed according to the procedure described in the examples described below unless otherwise specified.
  • the sheet 10 has a contact area S 0.5 between the pressing surface and the nonwoven fabric and the pressing surface.
  • the ratio (S 0.5 / Sa) to the unit total area Sa (see FIG. 9) (excluding the space when there is a space of 1 mm 2 or more in the surface direction) is 0.1 to 0.4, and further 0 .12 to 0.35, and particularly preferably 0.15 to 0.3. That the contact area S 0.5 is smaller than the unit total area with respect to the pressure in such a range means that the internal spaces 18 and 28 are maintained even under the pressure as shown in FIG.
  • the pressure of 0.5 gf / cm 2 is a pressure corresponding to a contact state between the seat and the skin when not sitting, for example, when applied to an actual absorbent article.
  • the contact area ratio as described above is preferably on both the first surface side and the second surface side, but may be only on one side.
  • a unit total area Sa as shown in FIG. 9 may be any region in a plan view in the nonwoven fabric, preferably, the This is a region in which a plurality of the first protrusions 1 and the second protrusions 2 are evenly included.
  • the contact area S 0.5 of the first projecting portion in the unit total area Sa was hatching This is the total area of each region. This ratio is the contact area ratio (S 0.5 / Sa).
  • the pressing surface and the contact area S 50 of the sheet 10 and the unit of the pressing surface when the sheet 10 is pressed in the surface direction with a pressure of 50 gf / cm 2 by the non-deformable pressing surface, the pressing surface and the contact area S 50 of the sheet 10 and the unit of the pressing surface.
  • the ratio (S 50 / Sa) to the total area Sa is preferably 0.3 to 0.9, more preferably 0.4 to 0.85, and particularly preferably 0.5 to 0.8.
  • the contact area S 50 is smaller than the unit total area with respect to the pressing (see FIG. 10C), and there is a space as a non-woven fabric structure even during pressing such as when sitting. This means that absorbency and breathability are maintained.
  • the contact area ratio as described above is preferably on both the first surface side and the second surface side, but may be only on one side.
  • the contact area ratio (S 50 / Sa) is viewed in the same manner as the contact area ratio (S 0.5 / Sa) except that the front and back sides are different.
  • the sheet thickness T 0.5 when pressed by a non-deformable pressing surface with a pressure of 0.5 gf / cm 2 is preferably 2.5 to 5, and more preferably 2.8. Preferably, it is ⁇ 4.5.
  • the sheet thickness T 50 when pressed at a pressure of 50 gf / cm 2 with a non-deformable pressing surface is preferably 0.5 to 1.3, more preferably 0.7 to 1.1. It is preferable.
  • the sheet 10 is non-deformability of the sheet thickness T 0.5 when pressed with a pressure of 0.5 gf / cm 2 by the pressing surface, nondeformable the nonwoven fabric at a pressure of 50 gf / cm 2 by the pressing surface of the
  • the ratio with respect to the sheet thickness T 50 (T 0.5 / T 50 ) when pressing in the surface direction is preferably 2.5 to 10, and more preferably 2.5 to 8.
  • the thicknesses T 0.5 and T 50 of the sheet 10 can be measured using the texture measurement system KES-FB3-AUTO-A.
  • the measurement settings are: sensitivity 2, compression speed 50 seconds / mm, data capture sensation 0.1 seconds, pressurization area 2 cm 2 (attached jig), and the size of the sheet to be measured is 15 cm ⁇ 15 cm Measure in the center of the measuring table.
  • the measurement is performed at three locations, the thickness at a load of 0.5 g / cm 2 is T 0.5 , the thickness at a load of 50 g / cm 2 is T 50, and the average value at each of the three locations is a measured value. It was.
  • the constricted part 7 of the seat 10 is in a part of the circumferential direction of the surface of the wall part 3, the constricted part 7 is formed from the second projecting part 2 from the viewpoint of providing cushioning and deformability of the sheet 10 as described above.
  • the wall 3 is preferably formed where stress is likely to concentrate. For example, when a sheet material is conveyed in the machine direction (MD direction) in order to shape the sheet, the sheet material is easily stretched in the MD direction, and the strength of the member is likely to decrease in the CD direction. Therefore, in the shaped sheet, stress tends to concentrate on the portion of the second protrusion 2 that matches the CD direction at the time of manufacture. It is preferable that the constricted portion 7 is formed in pairs at least at this portion.
  • the constricted portion 7 is preferably in the CD direction because the fiber web before shaping at the time of manufacture and conveyance tends to have the fibers oriented in the MD direction.
  • MD refers to the direction in which the sheet material flows during manufacture, and is an abbreviation for “Machine Direction”. Also called flow direction.
  • CD is a direction orthogonal to the MD in the sheet in-plane direction, and is an abbreviation of “Cross Direction”.
  • FIG. 11 is an explanatory view schematically showing a second protrusion having an elliptical planar shape with a major axis and a minor axis, (a) is a plan view, (b) is a front view, and (c) ) Is a cross-sectional side view. As shown in FIG.
  • the constricted portions 7 and 7 are formed in the minor axis n direction of the wall 3 of the second projecting portion 2. Is preferred.
  • the material for forming the sheet 10 having the above shape and characteristics will be described.
  • various sheet materials used for this type of article can be used as long as the above-described shape can be obtained.
  • a nonwoven fabric, a film, a woven fabric, paper, etc. are mentioned.
  • a composite sheet in which a plurality of these same or different materials are combined may be used.
  • the sheet 10 is applied to an absorbent article, it is preferable to appropriately select materials and properties in accordance with the function of the member.
  • a liquid-permeable sheet is preferred.
  • the sheet is preferably a moisture-permeable or leak-proof sheet.
  • seat for preventing the side leakage of a liquid it is preferable that it is a water-repellent sheet
  • the sheet 10 When the sheet 10 is applied to an absorbent article as a liquid-permeable member such as a top sheet, it is preferable to arrange the first surface side of the sheet 10 on the skin contact surface side. That is, the 2nd protrusion part 2 with the narrow part 7 becomes a non-skin contact surface side. Thereby, the collection property of the excrement of the sheet
  • nonwoven fabric air-through nonwoven fabric, spunbond nonwoven fabric, spunlace nonwoven fabric, melt blown nonwoven fabric and the like can be used.
  • the material is not particularly limited, and examples thereof include the following fibers.
  • Polyolefin fibers such as polyethylene (PE) fibers and polypropylene (PP) fibers; fibers using a thermoplastic resin such as polyethylene terephthalate (PET) and polyamide alone; composite fibers having a structure such as a core-sheath type and a side-by-side type, such as A core-sheath structure fiber in which the sheath component is polyethylene or low-melting-point polypropylene is preferable, and typical examples of the core / sheath structure fiber include PET (core) / PE (sheath), PP (core) / PE ( Sheath), fibers having a core-sheath structure such as PP (core) / low melting point PP (sheath).
  • the constituent fibers preferably include polyolefin fibers such as polyethylene fibers and polypropylene fibers, polyethylene composite fibers, and polypropylene composite fibers.
  • the composite composition of the polyethylene composite fiber is polyethylene terephthalate / polyethylene
  • the composite composition of the polypropylene composite fiber is preferably polyethylene terephthalate / low melting point polypropylene, and more specifically, PET (core). / PE (sheath), PET (core) / low melting point PP (sheath).
  • PET core
  • PE sheath
  • PET (core) / low melting point PP low melting point PP
  • a hydrophilic nonwoven fabric or the nonwoven fabric by which the hydrophilic treatment was carried out is preferable.
  • a water-repellent nonwoven fabric is preferable.
  • a non-woven fabric with a film moisture permeable / non-moisture permeable
  • a film As a film, the thing using synthetic resins, such as polyethylene and a polypropylene, is mentioned, for example. Moreover, it is good also as a sheet
  • a sheet made of a film as a back sheet of an absorbent article, etc. from the viewpoint of both leakage prevention and moisture permeability, for example, a hydrophobic thermoplastic resin, a minute inorganic filler made of calcium carbonate or the like, or compatibility
  • a hydrophilic microporous film etc. are preferable from a liquid-permeable viewpoint.
  • a film for a surface sheet, a side sheet, etc. since it touches skin directly, it is preferable that the embossing which has a cloth-like touch is given from the viewpoint of the touch.
  • the sheet 10 When the sheet 10 is made into a liquid-permeable sheet such as a surface sheet using the above-described forming material, and the sheet 10 is applied to an absorbent article, the following effects are further obtained in combination with the above-described shape. . (Absorption performance (liquid permeability, liquid diffusibility, liquid return prevention, etc.))
  • the sheet 10 also has an internal space 18 corresponding to the first protrusion 1 on the second surface side.
  • the internal space 18 of the first projecting portion 1 is disposed between the lower member such as the absorbent body.
  • the excrement may be temporarily stored in the internal space 28 of the second projecting portion 2, or may be transmitted to the second surface side through the top portion 11 and the wall portion 3, and the interior of the first projecting portion 1.
  • the constricted portion 7 included in the second projecting portion 2 retains the internal space by its spring property as described above and becomes like an inner lid of the internal space 28.
  • the liquid return to the first surface side is suppressed, and the force to the lower layer works in the internal space 28 to facilitate the extrusion of the liquid to the second surface side.
  • the liquid is easily transmitted to the non-skin contact surface side of the sheet 10 and is easily diffused between lower-layer members such as the absorber. That is, the sheet 10 is excellent in liquid permeability, liquid diffusibility, and liquid return preventing property.
  • the seat 10 can suppress liquid return from the internal space to the skin surface side by holding the internal space due to the above-described cushioning property, the spring property of the constricted portion 7, and the like. Further, the constricted portion 7 acts to push the liquid toward the absorber, and the absorption speed from the top sheet to the absorber can be maintained fast. Further, when the sheet 10 is a top sheet, the pressure applied to the lower absorbent body is appropriately dispersed and the shape restoring force is large, so that the liquid return amount from the absorbent body is reduced. In addition, when the liquid overflows from the absorbent body in the case of an overabsorbing state, the liquid is appropriately diffused by the internal space 18 to other absorption sites that still have room for absorption. Therefore, the sheet 10 has high absorption performance stability.
  • the wall portion 3 of the sheet 10 preferably has the orientation of the nonwoven fabric fibers oriented in the direction in which the wall stands up. A firm stiffness is born in the fiber portion thus oriented, and an appropriate cushioning property is realized without the fiber being crushed in the thickness direction. Furthermore, even if the nonwoven fabric is crushed by receiving the pressing force due to the fiber orientation of the wall portion 3 described above, the shape restoring force is large, and even if the packing state and wearing are continued, the initial cushioning property is not easily lost. Moreover, in the constricted part 7 of the wall part 3, since there exists the clearance gap between the fibers of a nonwoven fabric, it is easy to move more flexibly and stress is relieve
  • FIG. 10 The nonwoven fabric sheet 10 has a first protruding portion 1 (shown by an execution line) and a second protruding portion 2 (shown by a broken line), which are shown as simple circles in FIG. The sizes of these circles are slightly different for distinction, and do not coincide with the form shown in FIG.
  • the 1st protrusion part 1 and the 2nd protrusion part 2 are arrange
  • the first protrusion 1 and the second protrusion 2 in each row are alternately arranged, and when the protrusions of each row are projected in a direction (y direction) oblique to each row within the sheet surface, the first protrusions and the second protrusions are adjacent in the adjacent rows. Overlapping relationship. More specifically, the first protrusion 1 and the second protrusion 2 overlap each other in the n-th row and the (n + 2) -th row.
  • the present invention when the first protrusion and the second protrusion of the column k 1 is moved parallel to the y-direction, there is a superimposed relation to the first protrusions and second protrusions of the row k 3 .
  • the present invention is not construed as being limited to this, and there may be a shift between the adjacent first protrusion and second protrusion.
  • the wall part 3 is formed as these shared parts.
  • four wall portions 31, 32, 33, and 34 that are continuous from the four second protrusions 2 are formed.
  • the four wall portions 31 to 34 are connected by wall portions 31 ′, 32 ′, 33 ′, and 34 ′ in the in-plane direction of the sheet to form an annular wall portion 3 in series.
  • ridge portions 61 to 64 are formed.
  • FIG. 13 (a) is an illustration a rectangular model expand wall 3 shown in FIG. 12, line g 1 illustrated therein represents the orientation direction of the fibers.
  • the reference numerals 31 to 34 are added as positions that differ every 90 ° when viewed in a cross section cut along a plane orthogonal to the mother ship, with the annular wall portion as a cylinder.
  • the wall part 3 of this embodiment is orientated in the standing direction of the wall part in any location.
  • the 0 ° position (wall portion 31) and the 180 ° position (wall portion 33) are biased toward the second surface side (z 2 ) and have a strong orientation (line g 1b).
  • the 90 ° position (wall portion 32) and the 270 ° position (wall portion 34) are strongly oriented in a state of being biased to the first surface side (z 1 ) side.
  • a portion indicating (line g 1a ) is located.
  • the wall portion showing a strong orientation constitutes an orientation structure of an annular wall portion that gradually changes as a whole at the intermediate positions changing as 31, 32, 33, and 34. As described above, this produces a cushioning characteristic peculiar to the present embodiment.
  • an annular wall is usually used as shown in FIG.
  • the fiber orientation changes at each division position. Specifically, the fibers are oriented in the standing direction (line g 1c ) in the wall portions 31 and 33 as shown in the figure, whereas the fibers are oriented in the direction (line g 2 ) perpendicular to the wall portions 32 and 34. Are oriented.
  • FIG. 14 schematically shows the fiber orientation direction (line g 3 ) in a state where one second protruding portion 2 shown in FIG. 12 is taken out.
  • symbol of a wall part is attached
  • the fiber has a radial fiber orientation that converges toward the top 21 of the second protrusion 2.
  • the fibers are converged from the wall portion 3 to the second protrusion portion 2 so as to converge toward the top portion 21 of the second protrusion portion along the surface direction of the sheet surface. Is oriented.
  • action of uniformity of an external appearance, shape retainability, high absorption performance, etc. by having the fiber orientation in radiation
  • the method for manufacturing the nonwoven fabric sheet 10 may be a method generally used for this type of product as appropriate. If an example is given, the following aspects will be mentioned.
  • the fiber web before being fused is supplied from the card machine to the web shaping device so as to have a predetermined thickness.
  • air at normal temperature about 23 ° C.
  • the fiber web is fixed on a pedestal (not shown) having a large number of protrusions 9 (see FIG. 2) and air permeability.
  • hot air h see FIG. 2 is blown onto the fiber web on the pedestal at a temperature at which each fiber can be appropriately fused, and the fiber web is shaped along the protrusions 9 on the pedestal.
  • the fibers are fused.
  • the temperature of the hot air at this time is preferably 130 to 160 ° C. and the wind speed is preferably 20 to 80 m / s in consideration of a general fiber material used for this type of product.
  • pressing with a nip roll can be cited. It is preferable to press at a linear pressure of 20 to 50 kg / cm according to the state of the above-mentioned non-woven fabric.
  • the pedestal is transportable and the typed nonwoven fabric that is being conveyed is wound up by a roll.
  • the formation of the constriction may be performed immediately after the shaping process, or the constriction process may be performed when the shaped non-woven fabric is once wound on a roll and processed into an article such as a diaper or a sanitary product. You may go.
  • the thickness of the sheet 10 As a whole is referred to as the sheet thickness (T), and the local thickness of the sheet curved in the unevenness is distinguished as the layer thickness (S) (FIG. 2). reference).
  • the sheet thickness (T) may be appropriately adjusted depending on the use, but considering use as a surface sheet for diapers, sanitary products, etc., 1.0 mm to 4.5 mm is preferable, and 1.5 mm to 4.2 mm is more preferable. . By setting it as the range, it is possible to achieve both a good appearance with an appropriate stereoscopic effect and an excellent absorption performance.
  • the layer thickness may be different at each site in the sheet, and may be appropriately adjusted depending on the application.
  • the layer thickness (S 1 ) at the top of the first protrusion is preferably 0.1 mm to 1 mm, and more preferably 0.2 mm to 0.8 mm.
  • the preferred layer thickness ranges are the same for the layer thickness (S 2 ) at the top of the second protrusion and the layer thickness (S 3 ) at the wall.
  • the layer thickness S 1 of the first projecting portion 1, the layer thickness S 3 of layer thickness S 2, and the wall portion of the second projecting portion are substantially the same.
  • substantially the same means that the thickness is substantially the same when each cross section is observed.
  • the thickness of the sheet 10 does not substantially change between when it is dried and when it is wet. That is, it is preferably 85 to 115%, more preferably 90 to 110%, in the following thickness change rate.
  • Thickness change rate (%) Wet thickness (mm) / Dry thickness (mm) x 100 (Equation 1) -Thickness at the time of drying The thickness of the sheet after standing for 24 hours in a normal temperature (23 ° C, 50% RH) environment. -Thickness when wet The sheet is allowed to stand in a normal temperature (23 ° C., 50% RH) environment for 24 hours. Ion exchange water is put into a flat container larger than the sheet until the height becomes 10 mm. The sheet is put into this container and taken out after 1 hour. The thickness of this sheet.
  • the distance between the rows formed by the first protrusions 1 and the second protrusions 2 may be appropriately adjusted depending on the application, but is preferably 1 mm to 12 mm in consideration of use as a surface sheet for diapers, sanitary products, and the like. 5 mm to 6 mm is more preferable.
  • FIG. 15 is a perspective view schematically showing a disposable diaper 100 to which the sheet 10 is applied with a part cut away.
  • the diaper shown in the figure is a tape-type disposable diaper for infants, and is shown in a state where a diaper developed in a plane is bent slightly and viewed from the inside (skin contact surface side).
  • the disposable diaper 100 of the present embodiment includes a liquid-permeable top sheet 10 disposed on the skin contact surface side, a liquid-impermeable back sheet 81 disposed on the non-skin contact surface side, and a space therebetween. (See FIG. 15).
  • the sheet 10 of the above embodiment is applied as the top sheet, and the first protruding surface side is a skin contact surface.
  • an absorber 83 is interposed between the back sheet 81 and the top sheet 10.
  • the back sheet 81 is in the unfolded state, and has a substantially hourglass shape in which both side edges are confined inward in the longitudinal center c, and the back sheet 81 is composed of a plurality of sheets even if it is composed of one sheet. It may be a thing.
  • a side leakage preventing gather 82 formed by the side seat 85 is provided, and thereby side leakage of liquid or the like in the hip joint part due to an infant's exercise or the like can be effectively prevented.
  • a functional structure part, a sheet material, etc. may be provided.
  • FIG. 15 the arrangement
  • the diaper 100 of this embodiment is shown as a tape type, and a fastening tape 86 is provided on the flap portion on the back side r.
  • the diaper can be mounted and fixed by applying the tape 86 to a tape applying part (not shown) provided on the flap part on the ventral side f.
  • the center part c of the diaper is gently bent inward, and the absorbent body 83 is worn so as to run along the baby's buttocks and lower abdomen.
  • excreta is absorbed and held in the absorber 83 accurately.
  • seat 10 is applied as a surface sheet, and the favorable touch, cushioning property, and excretion collection property are shown.
  • the excrement collecting ability can achieve extremely high performance that cannot be achieved with a conventional surface sheet of linear protrusions or with a small hole, for example, the skin of an infant. It can be suitably protected from rough skin caused by diarrhea or soft stool.
  • the diaper 100 can suppress liquid return from the internal space to the skin surface side by holding the internal space due to the cushioning property of the seat 10, the spring property of the constricted portion 7, and the like. Further, the constricted portion 7 acts to push the liquid toward the absorber, and the absorption speed from the top sheet to the absorber can be maintained fast.
  • the sheet 10 moderately disperses the pressure applied to the lower-layer absorber and has a large shape restoring force, the amount of liquid return from the absorber to the top sheet is reduced.
  • the liquid is appropriately diffused by the internal space 18 to other absorption sites that still have room for absorption. Therefore, the diaper 100 is excellent in liquid permeability and high stability in absorption performance by suppressing liquid remaining and liquid return on the skin contact surface side of the top sheet.
  • the sheet of the present invention is excellent in cushioning properties and deformability, and has good air permeability. Moreover, the absorbent article of this invention becomes the thing excellent in the collection property of excrement using the said sheet
  • the sheet of the present invention can be used for various other purposes.
  • it can be suitably used as a surface sheet for absorbent articles such as the disposable diapers described above, sanitary napkins, panty liners, urine absorption pads and the like.
  • the surface sheet such as diapers and sanitary products and absorbents It can also be used as a sublayer interposed therebetween.
  • the form utilized as a surface sheet, a gather, an exterior sheet, and a wing is also mentioned.
  • the form used as a wiping wipe sheet, a cleaning sheet, and a filter is also mentioned.
  • This invention discloses the following sheets and absorbent articles further regarding embodiment mentioned above.
  • a first projecting portion projecting to the first surface side of the sheet in plan view and having an internal space, and a second surface side opposite to the first surface side, and the internal space
  • the first protrusion and the second protrusion are alternately spread in the plane direction of the sheet through the wall alternately in each of the different directions intersecting in plan view of the sheet.
  • the internal space of the first protrusion is open to the second surface side
  • the internal space of the second protrusion is open to the first surface side
  • the second protrusion protrudes from the top of the first protrusion.
  • the internal space held by the first protrusion and the second protrusion is in the shape of a truncated cone or hemisphere having a round top at the top similar to the outer diameter of each of the first protrusion and the second protrusion.
  • ⁇ 3> The sheet according to ⁇ 1> or ⁇ 2>, wherein the constricted portion is formed in pairs at least at two places.
  • ⁇ 4> In any one of the above items ⁇ 1> to ⁇ 3>, in the cross section in the thickness direction of the second protrusion, the constricted portion is narrower than the width of the second protrusion. Sheet.
  • the width B is the distance between the inner walls at a position where the pair of constricted portions are closest to each other
  • the width A is the width between the wall portions near and below the constricted portions. Is the distance between the inner walls of the widest portion, the ratio B / A of the width B to the width A is 0.2 to 0.9, according to any one of the above items ⁇ 1> to ⁇ 4> Sheet.
  • the constricted portion may be any one of the above items ⁇ 1> to ⁇ 5>, which is disposed at a boundary between the region p ′ 2 and the region p ′ 3 where the curvature of the top portion of the second projecting portion changes.
  • a ratio T 7 / T of a height T 7 from the top of the second protruding portion of the constricted portion to a thickness T of the sheet is 0.1 to 0.9.
  • ⁇ 12> The sheet according to any one of ⁇ 1> to ⁇ 11>, wherein the constricted portion of the sheet material is folded to form a laminated thickness portion by pressing in the sheet thickness direction.
  • ⁇ 13> The sheet according to any one of ⁇ 1> to ⁇ 12>, wherein the compression hardness LC of the sheet is 0.01 to 0.35.
  • ⁇ 14> When the sheet is pressed in the surface direction with a pressure of 50 gf / cm 2 by a non-deformable pressing surface, the contact area S 50 of the pressing surface and the sheet and the unit total area Sa of the pressing surface
  • ⁇ 17> The sheet according to any one of ⁇ 1> to ⁇ 16>, wherein the constricted portion is present in a direction orthogonal to a machine direction at the time of manufacture.
  • the internal space of the second projecting portion has an annular shape having a major axis and a minor axis in plan view, and the constricted portion is disposed in the minor axis direction.
  • the sheet according to any one of the above. ⁇ 19> The sheet according to any one of ⁇ 1> to ⁇ 18>, wherein the sheet is a nonwoven fabric.
  • ⁇ 20> The sheet according to ⁇ 19>, wherein the wall portion has a fiber orientation along a direction connecting the first projecting portion and the second projecting portion at any location in the planar direction of the sheet. .
  • An absorbent article in which the sheet according to any one of ⁇ 1> to ⁇ 20> is applied as a surface material with the second surface side facing the non-skin contact surface side.
  • a disposable diaper in which the sheet according to any one of ⁇ 1> to ⁇ 20> is applied as a surface material with the second surface side facing the non-skin contact surface side.
  • a fiber web containing thermoplastic fibers is transported onto a pedestal having a large number of protrusions and air permeability, and hot air is blown from the top of the fiber web toward the pedestal to form an uneven shape on the web.
  • a method for producing a nonwoven fabric comprising: Blowing the hot air to shape the fiber web along the protrusions on the pedestal; Then, the step of switching to a temperature higher than the hot air temperature and fusing each fiber, Furthermore, the manufacturing method of the nonwoven fabric which has the process of giving the press process by a nip roll.
  • Example 1 A 2.2-dtex ⁇ 51 mm core-sheath composite fiber having a core of polyethylene terephthalate and a sheath of polyethylene was supplied from the card machine to the web shaping device so as to have a basis weight of 30 g / m 2 .
  • normal temperature air was supplied to fix the fibrous web on a pedestal having a large number of protrusions and air permeability.
  • the pitch of the protrusions on this pedestal was 8 mm in the MD direction, 5 mm in the CD direction, and the protrusion height was 3 mm.
  • Example 2 A sheet test body 2 was obtained in the same manner except that the protrusion height of the protrusion on the base in Example 1 was set to 5 mm.
  • a nonwoven fabric having a bellows-like shape was produced in the same manner as in Example 1 of JP-A-2008-25081. Specifically, it is as follows.
  • As the first fiber layer low-density polyethylene (melting point 110 ° C.) and polyethylene terephthalate core-sheath structure, average fineness 3.3 dtex, average fiber length 51 mm, fiber A coated with a hydrophilic oil agent, and high-density polyethylene (melting point 135 ° C) and a core-sheath structure of polyethylene terephthalate, and a fiber layer in which an average fineness of 3.3 dtex, an average fiber length of 51 mm, and a fiber B coated with a water-repellent oil agent was used.
  • Fiber A and Fiber B were contained at a mixing ratio of 70:30, and the basis weight was adjusted to 15 g / m 2 .
  • a fiber layer having a core-sheath structure of high-density polyethylene and polyethylene terephthalate, an average fineness of 4.4 dtex, an average fiber length of 38 mm, and a fiber coated with a hydrophilic oil agent was used as the second fiber layer.
  • the basis weight in this fiber layer was 25 g / m 2 .
  • the apparatus similar to that shown in FIG. 8 and FIG. 9 of Japanese Patent Application Laid-Open No. 2008-25081 is used, while conveying the laminated fibers as described above, a temperature of 105 ° C. from the blowing part of the apparatus, A sheet test body c1 having a bellows-like shape was obtained by blowing hot air under conditions of an air volume of 1200 l / min.
  • Example 2 In the same manner as in Example 1 of Japanese Patent Application Laid-Open No. 2001-20168, a nonwoven fabric having irregularities was produced by embossing. Specifically, it is as follows. By forming a spunbonded nonwoven fabric made of polypropylene resin with a basis weight of 40 g / m 2 at 130 ° C.
  • Example 3 A nonwoven fabric having a two-layer structure having irregularities was produced in the same manner as in Example 1 of JP-A No. 2004-174234. Specifically, it is as follows. As nonwoven fabrics constituting the first and second sheets, air through nonwoven fabrics each having a basis weight of 18 g / m 2 and comprising 2.2 dtex core-sheath type composite fibers having a core of polyethylene terephthalate and a sheath of polyethylene are prepared. did. Using these sheets, an absorbent article sheet (sheet specimen c3) for disposable diapers was produced using an apparatus disclosed in JP-A No. 2004-174234. The height h of the convex part in the obtained sheet was 1.4 mm, the width w of the convex part along the X direction was 4.0 mm, and the width k of the joint part (concave part) was 1.0 mm.
  • a 10 cm square acrylic plate was prepared. At this time, the weight placed on the acrylic plate was adjusted so that the load was 50 gf / cm 2 .
  • a sheet was placed on a flat desk, an acrylic plate and a weight were placed thereon, and it was observed whether or not there was a space on the desk and between the acrylic plate and the sheet.
  • the thickness of the nonwoven fabric was measured using a texture measurement system KES-FB3-AUTO-A.
  • the measurement settings are: sensitivity 2, compression speed 50 seconds / mm, data capture sensation 0.1 seconds, pressurization area 2 cm 2 (attached jig), and the size of the sheet to be measured is 15 cm ⁇ 15 cm And placed in the center of the measuring table. Three measurements were taken according to the standard settings of the measuring instrument.
  • the thickness at a load of 0.5 g / cm 2 was defined as T0.5
  • the thickness at a load of 50 g / cm 2 was defined as T50
  • average values at three locations were measured values.
  • LC compression hardness
  • the compression hardness (LC) of the nonwoven fabric was measured using a texture measurement system KES-FB3-AUTO-A.
  • the measurement settings are: sensitivity 2, compression speed 50 seconds / mm, data capture sensation 0.1 seconds, pressurization area 2 cm 2 (attached jig), and the size of the sheet to be measured is 15 cm ⁇ 15 cm And placed in the center of the measuring table. Measurements were made at three locations according to the standard settings of the measuring instrument, and the average value was taken as the measured value.
  • a non-woven fabric specimen cut out to 280 ⁇ 160 mm was formed into a sublayer (web having a basis weight of 1220 g / m 2 having a core-sheath composite fiber of 4.43.3 dtex whose core is made of polyethylene terephthalate and whose sheath is made of polyethylene, and On the pulp absorbent body through an air-through non-woven fabric produced by superimposing a web having a basis weight of 20 g / m 2 having a core-sheath composite fiber of 7.8 dtex having a core of polypropylene and a sheath of polyethylene. Installed.
  • a load of 20 g / cm 2 was evenly applied on the nonwoven fabric, and a cylinder with an inner diameter of 36 mm placed at the approximate center of the test specimen was applied, and physiological saline was injected therefrom. Thereafter, physiological saline was injected three times at a rate of 40 g every 10 minutes, and the time (seconds) to be absorbed when the third injection was performed was measured.
  • the measurement results of each sample are shown in Table 1 below. The evaluation of the measurement results was distinguished as follows in consideration of practical requirements.
  • B Absorption time is 180 to 300 seconds.
  • C Absorption time is 300 seconds or more.
  • the non-woven fabrics (Examples) according to preferred embodiments of the present invention have better air permeability, higher cushioning and deformability, and faster absorption speed than the comparative examples. It can be seen that it is excellent in skin-friendly properties that do not stick.

Abstract

This sheet (10) has a first protruding section (1) which protrudes to a first surface side on the planar view side and has an internal space (18), and a second protruding section (2) which protrudes to a second surface side on the opposite side to the first surface side and has an internal space (28). The first protruding section (1) and the second protruding section (2) are arranged so as to consecutively alternate, having a wall section (3) therebetween, in each different direction intersecting in the planar view of the sheet (10), and spread in the sheet planar direction. The internal space (18) of the first protruding section (1) opens to the second surface side, and the internal space (28) of the second protruding section (2) opens to the first surface side. The wall section (3) extending from the peak of the first protruding section (1) to the peak of the second protruding section (2) has a section (7) narrowing towards the internal space (28) of the second protruding section (2).

Description

シート及びこれを用いた吸収性物品Sheet and absorbent article using the same
 本発明は突起のあるシート及びこれを用いた吸収性物品に関する。 The present invention relates to a sheet with protrusions and an absorbent article using the same.
 生理用ナプキン、パンティーライナー、及び使い捨ておむつ等といった吸収性物品において、その機能に応じて、シート材の片面に突出した部分を設けたものや、筋状に隆起した部分を設けたもの、多数の孔をあけたものなどが開発されている。例えば特許文献1には、シート材の片面に筋状に延びる突出部があり、その断面がかまぼこ(略半円)形状にされた積層シートが開示されている。これにより、例えばクッション性のある表面シートとして用いることができるとされる。特許文献2には、圧縮回復率が高いシートとして、シートの片面側に突出した円錐台状の突出部をエンボスによって多数設けたシートが開示されている。特許文献3には、実質的に伸縮しない2層のシート状物からなるシートであって、上層のシート状物が多数の直方体状の凸部を有するものとされ、上層の凸部と下層との間が空洞となっている吸収性物品の表面シートが開示されている。このシートにより、凸部内の閉じた空洞部分に液を捕捉できて液漏れ防止や隠蔽性が良化するとされる。 Absorbent articles such as sanitary napkins, panty liners, disposable diapers, etc., depending on the function, those provided with a protruding part on one side of the sheet material, those provided with a line-like protruding part, many Products with holes have been developed. For example, Patent Document 1 discloses a laminated sheet having a protruding portion extending in a streak shape on one side of a sheet material and having a cross-section (substantially semicircle) in cross section. Thereby, it is supposed that it can be used, for example as a cushioning surface sheet. Patent Document 2 discloses a sheet having a large number of frustoconical protrusions protruding from one side of the sheet as embossed sheets as a sheet having a high compression recovery rate. Patent Document 3 is a sheet composed of a two-layer sheet that does not substantially expand and contract, and the upper sheet has a large number of rectangular parallelepiped protrusions. A surface sheet of an absorbent article having a space between the two is disclosed. With this sheet, it is supposed that the liquid can be captured in the closed hollow portion in the convex portion, and the liquid leakage prevention and concealing properties are improved.
特開2008-25081号公報JP 2008-25081 A 特開2001-20168号公報JP 2001-20168 A 特開2004-174234号公報JP 2004-174234 A
 本発明は、シートを平面視した側の第1面側に突出し、かつ、内部空間を有する第1突出部と、前記第1面側とは反対側の第2面側に突出し、かつ、内部空間を有する第2突出部とを有し、前記第1突出部及び第2突出部は、該シートの平面視交差する異なる方向のそれぞれに交互に壁部を介し連続してシート平面方向に広がって配され、前記第1突出部の内部空間は第2面側に開放され、前記第2突出部の内部空間は第1面側に開放されており、前記第1突出部の頂部から第2突出部の頂部へと繋がる前記壁部には、前記第2突出部の内部空間へ向けて括れた部分を有するシートを提供する。 The present invention projects to the first surface side on the side of the sheet in plan view, and has a first projecting portion having an internal space, projects to the second surface side opposite to the first surface side, and A second projecting portion having a space, and the first projecting portion and the second projecting portion continuously extend in the sheet plane direction through the wall portions alternately in different directions intersecting in plan view of the sheet. The internal space of the first protrusion is opened to the second surface side, the internal space of the second protrusion is open to the first surface side, and the second space extends from the top of the first protrusion. The wall portion connected to the top portion of the protruding portion provides a sheet having a portion constricted toward the internal space of the second protruding portion.
 本発明の上記及び他の特徴及び利点は、下記の記載からより明らかになるであろう。 The above and other features and advantages of the present invention will become more apparent from the following description.
本発明の一実施形態としてのシートを一部断面により模式的に示す斜視図である。It is a perspective view showing typically a sheet as one embodiment of the present invention by a partial section. 図1のシートにおける領域IIを拡大して示す断面図である。It is sectional drawing which expands and shows the area | region II in the sheet | seat of FIG. 図1のシートにおけるIII-III線断面を拡大して示す断面図である。FIG. 3 is an enlarged cross-sectional view taken along line III-III in the sheet of FIG. 図1のシートにおけるIV-IV線断面を拡大して示す断面図である。FIG. 4 is an enlarged cross-sectional view taken along the line IV-IV in the sheet of FIG. 1. 本実施形態のシートの断面を撮像した図面代用写真である。It is a drawing substitute photograph which imaged the section of the sheet of this embodiment. 第2突出部及びその内部空間について厚み方向断面を拡大して模式的に示す拡大断面図である。It is an expanded sectional view expanding and showing typically a thickness direction section about the 2nd projection part and its internal space. 第2突出部の外面を拡大して模式的に示す説明図である。It is explanatory drawing which expands and shows the outer surface of a 2nd protrusion part typically. 本実施形態のシートを押圧して括れ部が積層厚み部となった様子を模式的に示す説明図である。It is explanatory drawing which shows typically a mode that the sheet | seat of this embodiment was pressed and the constriction part became the lamination | stacking thickness part. 第1突出部と第2突出部との関係を平面視により模式的に示す説明図である。It is explanatory drawing which shows typically the relationship between a 1st protrusion part and a 2nd protrusion part by planar view. 本実施形態のシートを押圧したときの様子を模式化して示す説明図である。It is explanatory drawing which shows typically a mode when the sheet | seat of this embodiment is pressed. 長軸及び短軸のある楕円平面形状を有する第2突出部を模式的に示す説明図であり、(a)は平面図であり、(b)は正面図であり、(c)は断面側面図である。It is explanatory drawing which shows typically the 2nd protrusion part which has an ellipse plane shape with a long axis and a short axis, (a) is a top view, (b) is a front view, (c) is a cross-sectional side view FIG. 図9の一部を拡大して示す説明図である。It is explanatory drawing which expands and shows a part of FIG. 壁部の繊維配向の状態を展開して模式的に示す説明図である。It is explanatory drawing which expand | deploys and shows the state of the fiber orientation of a wall part typically. 第2突出部の繊維配向の状態を平面視により模式的に示す説明図である。It is explanatory drawing which shows typically the state of the fiber orientation of a 2nd protrusion part by planar view. 本発明の一実施形態のおむつを模式的に示す斜視図である。It is a perspective view showing typically a diaper of one embodiment of the present invention.
 本発明は、クッション性及び変形性に優れ、通気性が良好なシートに関する。また本発明は、前記シートを用いて排泄物の捕集性に優れた吸収性物品に関する。 The present invention relates to a sheet excellent in cushioning and deformability and having good air permeability. Moreover, this invention relates to the absorbent article excellent in the excretion collection property using the said sheet | seat.
 本発明者らは、上述の従来のものとは異なる形態を探求し、従来とは異なる性質やより良化した機能を付与しうるシートを提供することを目的に鋭意研究開発を行った。具体的には、シート材の片面側のみではなく、表裏両面に突出した部分を有する連続したシートの作製とその性質・機能を検討した。本発明はこれらの知見に基づいて完成させるに至ったものである。 The inventors of the present invention have conducted extensive research and development for the purpose of searching for a form different from the above-described conventional one and providing a sheet capable of imparting a property different from the conventional one and a better function. Specifically, the production and properties / functions of continuous sheets having portions protruding on both the front and back surfaces as well as on one side of the sheet material were examined. The present invention has been completed based on these findings.
 図1は本発明の好ましい実施形態としてのシートの要部を模式的に示す一部断面斜視図である。図2は図1のシートにおける領域IIを拡大して示し、図3及び図4はそれぞれそのIII-III線断面及びIV-IV線断面を示す拡大断面図である。このシート10は例えば生理用ナプキンや使い捨ておむつなどの吸収性物品のシート部材として適用することが好ましく、第1面側z(図2参照)を着用者の肌面側に向けて用い、第2面側zを物品内部の吸収体(図示せず)側に配置して用いることが好ましい。以下、上記図面に示した不織布10の上記のとおり第1面側を着用者の肌面に向けて用いる実施態様を考慮して説明するが、本発明がこれにより限定して解釈されるものではない。 FIG. 1 is a partial cross-sectional perspective view schematically showing a main part of a sheet as a preferred embodiment of the present invention. 2 is an enlarged view of a region II in the sheet of FIG. 1, and FIGS. 3 and 4 are enlarged sectional views showing a section taken along line III-III and a section taken along line IV-IV, respectively. The sheet 10 is preferably applied as a sheet member of an absorbent article such as a sanitary napkin or a disposable diaper, and the first surface side z 1 (see FIG. 2) is used toward the wearer's skin surface. it is preferable to use by placing the second adhesive surface z 2 to the article inside of the absorber (not shown) side. Hereinafter, although it explains considering the embodiment which uses the 1st surface side toward the wearer's skin surface as mentioned above of nonwoven fabric 10 shown in the above-mentioned drawing, the present invention is limited and interpreted by this Absent.
 本実施形態のシート10は、図1に示すように、シート10を平面視した第1面側には、多数の第1突出部1が縦横の2つの方向に面内で斜交する関係で延び配列されている(以下、この配列を斜交格子状配列ということがある。)。この格子状配列が直交(90°)する関係でもよく、そのときには直交格子状の配列として区別していうことがある。本実施形態においては、その面内における第1方向(x)と第2方向(y)が、30°~90°の角度で交差していることが好ましい。さらにシート10には、前記第1面側と反対側の第2面側に突出する多数の第2突出部2が形成されている。この第2突出部2も斜交格子状配列になっているが、直交格子状配列であってよい。その交差角度の好ましい範囲は、第1突出部1に伴って定まるため、上記と同様である。この第1突出部1と第2突出部2とは、シート面に対して互いに反対方向に突出している。 As shown in FIG. 1, the sheet 10 according to the present embodiment has a large number of first protrusions 1 obliquely intersecting with each other in two vertical and horizontal directions on the first surface side when the sheet 10 is viewed in plan. The arrangement is extended (hereinafter, this arrangement may be referred to as an oblique grid arrangement). The lattice arrangement may be orthogonal (90 °), and in that case, the lattice arrangement may be distinguished as an orthogonal lattice arrangement. In the present embodiment, it is preferable that the first direction (x) and the second direction (y) in the plane intersect at an angle of 30 ° to 90 °. Further, the sheet 10 is formed with a number of second projecting portions 2 projecting to the second surface side opposite to the first surface side. The second protrusions 2 are also arranged in an oblique grid pattern, but may be an orthogonal grid pattern. Since the preferable range of the crossing angle is determined along with the first protrusion 1, it is the same as described above. The first projecting portion 1 and the second projecting portion 2 project in directions opposite to each other with respect to the sheet surface.
 そして第1突出部1と第2突出2とは、シート10の平面視交差する異なる方向のそれぞれに交互に壁部3を介し連続して面方向に広がるよう配されている。図1においては、s方向及びs方向に第1突出部1と第2突出2とが交互にシート平面方向に連続的に配列されている。さらに平面視のみならず側面視においても第1突出部及び第2突出2が同一位置にない、つまり重なりのない関係で両者が交互に配置するようにされている(図2参照)。
 上記のようにして面内の第1方向(x方向)及び第2方向(y方向)にそれぞれ延び配列された第1突出部1と第2突出部2とは、シート平面方向に矛盾無く連続し、シート10を構成している。ここで、矛盾無く連続するとは、特定の形状部分が連なって面状になるとき、屈折したり不連続になったりせず、緩やかな曲面で全体が連続した状態になることをいう。
And the 1st protrusion part 1 and the 2nd protrusion 2 are distribute | arranged so that it may spread in the surface direction continuously via the wall part 3 by each in the different direction which cross | intersects the planar view of the sheet | seat 10. As shown in FIG. In Figure 1, s 1 direction and s in two directions the first projecting portion 1 and the second protrusion 2 are continuously arranged in the sheet plane direction alternately. Furthermore, not only in a plan view but also in a side view, the first protrusions and the second protrusions 2 are not located at the same position, that is, they are arranged alternately so as not to overlap (see FIG. 2).
As described above, the first projecting portion 1 and the second projecting portion 2 that are arranged to extend in the first direction (x direction) and the second direction (y direction) in the plane are continuous without contradiction in the sheet plane direction. And the sheet | seat 10 is comprised. Here, “continuous without contradiction” means that when a specific shape portion is continuous and becomes planar, it is not refracted or discontinuous, and the whole is continuous with a gentle curved surface.
 前記「連続」とは、シートの素材が実質的に断絶することなくシートの面状が形成されていることであり、例えば、断続した部分やシート素材を部分的に欠いた孔領域がないことを意味する。ただし、繊維間細孔のような微細孔は前記孔領域には含まれない。これを区別していうときには、例えば孔領域をその円相当直径で1mm以上のものと定義することができる。上記の「連続」の語には、積層シートであることも含まれるが、本実施形態においては積層していない単層のシートをその好ましい実施形態として示している。また、この「連続」という語の意味を、不織布の第1面側zの面と第2面側zの面とが実質的に連なっていると表現することもできる。ここでの実質的に連なるとは、上記のとおりに、本発明の効果を損なわない範囲で孔を有さずそれより小さな微細孔を有していてもよい意味である。 The “continuous” means that the sheet material is formed without any substantial breakage of the sheet material, for example, there are no interrupted portions or hole regions partially lacking the sheet material. Means. However, micropores such as interfiber pores are not included in the pore region. When distinguishing this, for example, the hole region can be defined as having a circle equivalent diameter of 1 mm or more. The term “continuous” includes a laminated sheet. In the present embodiment, a single-layer sheet that is not laminated is shown as a preferred embodiment. Further, the meaning of the word “continuous” can also be expressed as the surface on the first surface side z 1 and the surface on the second surface side z 2 of the nonwoven fabric being substantially continuous. The term “substantially continuous” here means that, as described above, the pores may be included and the micropores may be smaller than that without impairing the effects of the present invention.
 本発明のシートにおいて、第1突出部と第2突出部との配列形態は上記に限定されず、矛盾無く連続しうる配列で配置しうる形態であればよく、例えば、第1突出部を中心に6角形の頂点に6つの第2突出部が配置し、そのパターンが面内に広がる配列であってもよい。なお、この場合、第2突出部の数が第1突出部の数を上回るため、第2突出部同士が隣接する状態が生じるが、全体において連続したシート状態が構成される限りにおいて、このような形態の配列も第1突出部と第2突出部とが「交互」に配列したという意味に含まれる。 In the seat of the present invention, the arrangement form of the first protrusions and the second protrusions is not limited to the above, and may be any form that can be arranged in an arrangement that can be continued without contradiction. Alternatively, six second protrusions may be arranged at the apexes of the hexagon, and the pattern may be spread in the plane. In this case, since the number of the second protrusions exceeds the number of the first protrusions, the second protrusions are adjacent to each other. However, as long as a continuous sheet state is formed as a whole, this is the case. Such an arrangement is included in the meaning that the first protrusions and the second protrusions are arranged alternately.
 本実施形態において第1突出部1及び第2突出部2は頂部11及び21に丸みをもった円錐台形状もしくは半球状にされている。より詳細にみれば、第1突出部1の突出形状は尖鋭ではなくどちらかというと半球状であり、他方、第2突出部2の突出形状はより尖鋭であり頂部21に丸みのある円錐ないし円錐台形状になっている。なお、本実施形態において突出部は上記形状に限定されず、どのような突出形態でもよく、例えば、様々な錐体形状(本明細書において錐体形状とは、円錐、円錐台、角錐、角錐台、斜円錐等を含む意味である。)であることが実際的である。 In the present embodiment, the first projecting portion 1 and the second projecting portion 2 have a truncated cone shape or hemispherical shape with rounded top portions 11 and 21. More specifically, the protruding shape of the first protruding portion 1 is not sharp but rather hemispherical, while the protruding shape of the second protruding portion 2 is sharper and the top 21 has a round cone. It has a truncated cone shape. In the present embodiment, the protruding portion is not limited to the above shape, and any protruding shape may be used. For example, various cone shapes (in this specification, the cone shape is a cone, a truncated cone, a pyramid, a pyramid It is practical to include a table, a slanted cone, etc.).
 第1突出部1及び第2突出部2には、その外径と相似する頂部に丸みのある円錐台形状もしくは半球状の内部空間18、28を保持している。第1突出部1の内部空間18は第2面側に開放され、第2突出部2の内部空間28は第1面側に開放されている。また、それぞれの内部空間18及び28は、尾根部6を介して隔てられており実質的に連続しない空間として形成されている(図2参照)。
 他方、第1突出部1と第2突出部2のシート厚み方向における間には、壁部3が構成されており、この壁部3ないし上記尾根部6を介して両突出部が連続するシート構造とされている。壁部3は第1突出部1と第2突出部2とを繋ぐ部分である。壁部3は、両突出部とは明確に領域区別されるものではなく、両突出部それぞれの頂部11及び21から伸びる裾野部分である。つまり壁部3は、両突出部の共有部分であり両突出部の一部である。また壁部3は、第1突出部1の内部空間18とこれに隣接する第2突出部の内部空間28とを隔てる部分であり、両内部空間の外縁をなす部分でもある。
The first projecting portion 1 and the second projecting portion 2 hold frustoconical or hemispherical internal spaces 18 and 28 having rounded tops similar to the outer diameter thereof. The internal space 18 of the 1st protrusion part 1 is open | released by the 2nd surface side, and the internal space 28 of the 2nd protrusion part 2 is open | released by the 1st surface side. Moreover, each internal space 18 and 28 is separated through the ridge part 6, and is formed as a space which is not substantially continuous (refer FIG. 2).
On the other hand, a wall portion 3 is formed between the first protruding portion 1 and the second protruding portion 2 in the sheet thickness direction, and both protruding portions are continuous through the wall portion 3 or the ridge portion 6. It is structured. The wall 3 is a portion that connects the first protrusion 1 and the second protrusion 2. The wall 3 is not clearly distinguished from the two protrusions but is a skirt extending from the tops 11 and 21 of the two protrusions. That is, the wall part 3 is a shared part of both protrusion parts, and is a part of both protrusion parts. Moreover, the wall part 3 is a part which separates the internal space 18 of the 1st protrusion part 1, and the internal space 28 of the 2nd protrusion part adjacent to this, and is also a part which makes the outer edge of both internal space.
 シート10において、第2突出部2を形成する壁部3には、図5に示すように、第2突出部2の内部空間28へ向けて括れた部分(以後、括れ部7という。)が形成されている。図5は、本実施形態のシート10の断面を撮像した図面代用写真である。図5では、括れ部7の配置領域を一点鎖線で示し符号7を付している。図5に示すように、括れ部7は、少なくとも2箇所に対をなして形成されていることが好ましい。つまり一対の括れ部7は、文字どおり、第2突出部2の断面放物線の幅(A)に対して幅狭(B)にされた部分である。幅(B)は、一対の括れ部7,7が最も接近した位置でのその内壁の距離であり、幅(A)は、括れ部7付近及びその下方で壁部3同士の幅が最も広い部分の内壁間の距離である。
 括れ部7の幅狭に関して、例えば図6に示すような形態が挙げられる。図6は、第2突出部2及びその内部空間28について厚み方向断面を拡大して模式的に示す拡大断面図である。図6(a)では第2突出部2の断面形状が放物線状であり、第2突出部の幅(A)に対して括れ部7が幅狭(B)とされている。図6(b)では頂部21付近が膨らんだ形状であり、第2突出部の幅(A)に対して括れ部7が幅狭(B)とされている。図6(c)では頂部21付近が上方よりも小さくされた形状であり、第2突出部の幅(A)に対して括れ部7が幅狭(B)とされている。各断面幅の比率(B/A)は、0.2~0.9が好ましく、0.4~0.8がさらに好ましい。通液性の観点から0.2以上が好ましく、また、クッション性の観点から0.8以下が好ましい。
As shown in FIG. 5, in the sheet 10, the wall 3 that forms the second projecting portion 2 has a portion that is constricted toward the internal space 28 of the second projecting portion 2 (hereinafter referred to as the constricted portion 7). Is formed. FIG. 5 is a drawing-substituting photograph in which a cross section of the sheet 10 of the present embodiment is imaged. In FIG. 5, the arrangement | positioning area | region of the narrow part 7 is shown with the dashed-dotted line, and the code | symbol 7 is attached | subjected. As shown in FIG. 5, the constricted portions 7 are preferably formed in pairs at least at two places. That is, the pair of constricted portions 7 are literally portions (B) narrower than the width (A) of the cross-sectional parabola of the second projecting portion 2. The width (B) is the distance between the inner walls at a position where the pair of constricted portions 7 and 7 are closest to each other, and the width (A) is the widest width between the wall portions 3 near and below the constricted portion 7. It is the distance between the inner walls of the part.
Regarding the narrow width of the constricted portion 7, for example, a form as shown in FIG. FIG. 6 is an enlarged cross-sectional view schematically showing an enlarged cross section in the thickness direction of the second protrusion 2 and the internal space 28 thereof. In FIG. 6A, the cross-sectional shape of the second protrusion 2 is a parabola, and the constricted part 7 is narrower (B 1 ) than the width (A 1 ) of the second protrusion. In FIG. 6B, the vicinity of the top portion 21 has a swelled shape, and the constricted portion 7 is narrower (B 2 ) than the width (A 2 ) of the second protruding portion. FIG 6 (c) has a shape in the vicinity of the top portion 21 is smaller than the upper, constricted portion 7 relative to the width of the second projecting portion (A 3) is narrower (B 3). The ratio (B / A) of each cross-sectional width is preferably 0.2 to 0.9, and more preferably 0.4 to 0.8. From the viewpoint of liquid permeability, 0.2 or more is preferable, and from the viewpoint of cushioning property, 0.8 or less is preferable.
 この幅(A)及び(B)の関係について別の視点からいえば、一対の括れ部7を通る第2突出部2のシート厚み(T)断面において、第2突出部2の頂部21周辺の曲率に基づく曲線uよりも括れ部7が内側に配される関係と定義される。つまり曲線uがなす幅よりも括れ部7が幅狭として定義される。前記曲線uがなす幅は、前述の括れ部7の幅狭(B)の高さ位置における幅である(図6参照)。この定義の例として図6を参照すれば、図6(a)では、曲線uが第2突出部2全体の形状と一致し、その壁部3の幅(A11)に対して括れ部7が幅狭(B)とされている。図6(b)では、曲線uの幅が頂部11から延びる壁部の幅よりも広くされている。つまり、第2突出部2の内部空間28の頂部21付近が大きくされた巾着形状である。この例では、曲線uの幅(A21)に対して括れ部が幅狭(B)とされている。図6(c)では、曲線uの幅が頂部11から延びる壁部の幅よりも狭くされている。この例では、曲線uの幅(A31)に対して括れ部が幅狭(B)とされている。
 以上の例にあるように、第2突出部2の内部空間28の頂部21周辺の空間広さに対して、その上部で内部空間28が搾られるように括れ部7が配置されていることが好ましい。この観点から、図6(a)の比率(B/A11)及び図6(c)の比率(B/A31)は、0.15~0.85が好ましく、0.3~0.75がさらに好ましい。図6(b)の比率(B/A21)は、0.1~0.8が好ましく、0.25~0.7がさらに好ましい。通液性の観点から0.15以上が好ましく、また、クッション性の観点から0.85以下がさらに好ましい。
Speaking from another viewpoint about the relationship between the widths (A) and (B), in the sheet thickness (T) section of the second projecting portion 2 passing through the pair of constricted portions 7, the area around the top portion 21 of the second projecting portion 2. It is defined as a relationship in which the constricted portion 7 is arranged inside the curve u based on the curvature. That is, the narrow portion 7 is defined as narrower than the width formed by the curve u. The width formed by the curve u is the width at the narrow (B) height position of the constricted portion 7 (see FIG. 6). Referring to FIG. 6 as an example of this definition, in FIG. 6A, the curve u matches the shape of the entire second protrusion 2 and the constricted portion 7 with respect to the width (A 11 ) of the wall 3. Is narrow (B 1 ). In FIG. 6B, the width of the curve u is wider than the width of the wall portion extending from the top portion 11. That is, it is a drawstring shape in which the vicinity of the top 21 of the internal space 28 of the second protrusion 2 is enlarged. In this example, the constricted portion is narrow (B 2 ) with respect to the width (A 21 ) of the curve u. In FIG. 6C, the width of the curve u is narrower than the width of the wall portion extending from the top portion 11. In this example, the constricted portion is narrow (B 3 ) with respect to the width (A 31 ) of the curve u.
As in the above example, the constricted part 7 is arranged so that the internal space 28 is squeezed at the upper part with respect to the space area around the top part 21 of the internal space 28 of the second projecting part 2. preferable. From this viewpoint, the ratio (B 1 / A 11 ) in FIG. 6A and the ratio (B 3 / A 31 ) in FIG. 6C are preferably 0.15 to 0.85, and 0.3 to 0 More preferred is .75. The ratio (B 2 / A 21 ) in FIG. 6B is preferably from 0.1 to 0.8, and more preferably from 0.25 to 0.7. From the viewpoint of liquid permeability, 0.15 or more is preferable, and from the viewpoint of cushioning property, 0.85 or less is more preferable.
 括れ部7は、第1突出部1の頂部11と第2突出部2の頂部21とを結ぶ壁部3において、シート厚み(T)に対して任意の高さに配することができる。その中でも下記3区分の定義において、括れ部7は、領域PからPの上部寄りの範囲に、または頂部21の曲率が変化する領域p’と領域p’との境界に配されることが好ましい(図2参照)。また下記2区分の定義において、括れ部7は、中央線(中央面)m又はm’よりも半身厚みt側に、括れ部7が配されることが好ましい(図2参照)。
 より具体的には、括れ部7の頂部21からの高さ(T)の、シート厚み(T)に対する比率(T/T)は、0.1~0.9が好ましく、0.2~0.8が好ましい。クッション性の観点から0.1以上が好ましく、また、クッション性や肌触りの観点から0.9以下が好ましい。
The constricted part 7 can be arranged at an arbitrary height with respect to the sheet thickness (T) in the wall part 3 connecting the top part 11 of the first projecting part 1 and the top part 21 of the second projecting part 2. Among them, in the definition of the following three sections, the constricted portion 7 is arranged in the range closer to the top of the regions P 2 to P 3 or the boundary between the region p ′ 2 and the region p ′ 3 where the curvature of the top portion 21 changes. It is preferable (see FIG. 2). Further, in the definition of the following two sections, it is preferable that the constricted portion 7 is arranged on the half thickness t 2 side of the center line (center plane) m or m ′ (see FIG. 2).
More specifically, the ratio (T 7 / T) of the height (T 7 ) from the top 21 of the constricted part 7 to the sheet thickness (T) is preferably 0.1 to 0.9, 0.2 ~ 0.8 is preferred. From the viewpoint of cushioning properties, 0.1 or more is preferable, and from the viewpoint of cushioning properties or touch, 0.9 or less is preferable.
(3区分)
 3区分は、典型的には壁部3をシート厚み(T)の3等分(P=P=P)として定義される。あるいは、図6(b)のように第1突出部1と第2突出部2との頂部の尖度ないし曲率が異なるときには、壁部3は、断面において直線状になった比較的狭い部分の領域P’と、そこから湾曲し丸みを帯びいく領域をそれぞれP、P’として区分することもできる。つまり、第2突出部頂部2の頂部21の曲率半径が第1突出部頂部1の頂部11の曲率半径より大きくされている(曲率が小さい)。この後者の区分は、図6(c)においても適用でき、第2突出部頂部2の頂部21の曲率半径が第1突出部頂部1の頂部11の曲率半径より小さくされている(曲率が大きい)。
(3 categories)
The three sections are typically defined by dividing the wall 3 into three equal parts of the sheet thickness (T) (P 1 = P 2 = P 3 ). Or when the kurtosis or curvature of the top part of the 1st protrusion part 1 and the 2nd protrusion part 2 is different like FIG.6 (b), the wall part 3 is a comparatively narrow part which became linear in the cross section. The region P ′ 2 and the curved and rounded region can be classified as P 1 and P ′ 3 , respectively. That is, the radius of curvature of the top 21 of the second protrusion top 2 is larger than the radius of curvature of the top 11 of the first protrusion 1 (the curvature is small). This latter section can also be applied in FIG. 6C, in which the radius of curvature of the top portion 21 of the second protruding portion top portion 2 is smaller than the radius of curvature of the top portion 11 of the first protruding portion top portion 1 (the curvature is large). ).
(2区分)
 第1面側の半身厚み(t)及び第2面側の半身厚み(t)も上記と同様であり、基本的には、シート厚み(T)を2等分した線を中央線(中央面)mとし、両半身厚み(t,t)が等しいものとしてみる。あるいは、第1突出部1と第2突出部2との頂部における尖度もしくは曲率半径に差がある場合には、壁部の断面直線状部分の中央と評価される位置m’で区分し定義することができる。図6(c)の例では、後者の定義によるならば、第1面側の半身厚みt<第2面側の半身厚みtとされている。
(2 categories)
The half thickness (t 1 ) on the first surface side and the half thickness (t 2 ) on the second surface side are the same as described above. Basically, the line obtained by dividing the sheet thickness (T) into two equal parts is the center line ( It is assumed that the center plane is m and the thicknesses (t 1 , t 2 ) are equal. Alternatively, when there is a difference in the kurtosis or the radius of curvature at the top of the first projecting portion 1 and the second projecting portion 2, the definition is made by dividing the position by the position m ′ evaluated as the center of the straight section of the wall portion. can do. In the example of FIG. 6C, according to the definition of the latter, the half thickness t 1 on the first surface side <the half thickness t 2 on the second surface side.
 次に括れ部7の壁面3表面における好ましい形状について説明する。
 括れ部7は、壁部3表面の周方向の一部にあってもよく、全周にあってもよい。一部にある場合は、少なくとも内部空間28を介して対向する2か所にあることが好ましい。
 括れ部7,7が対をなして配される場合、各括れ部7は、第2突出部2をなす壁部3の曲面において、図7(a)及び(b)に示すように所定の幅に筋状に形成されたものであってもよく、図7(c)に示すように点状に形成されたものであってもよい。なお図7(a)では括れ部7が壁部3外周の半円周長さに近似するがそれよりも短くされており、図7(b)では前記(a)のものよりも短い括れ部7とされている。シート10において、後述のクッション性や括れ部7のばね性による変形性の付与の観点から、図7(a)や(b)のように所定幅に筋状に括れが形成されていることが好ましい。この所定幅に関して、括れ部7が配される高さ位置の第2突出部2の外周の半円周長さを(C)とし、括れ部7の括れ筋の周長さを(D)としたとき、これらの比率(D/C)は、クッション性等の観点から0.2~0.9が好ましく、0.3~0.8がさらに好ましい。
Next, the preferable shape in the wall surface 3 surface of the narrow part 7 is demonstrated.
The constricted part 7 may be in a part of the circumferential direction of the surface of the wall part 3 or may be in the entire circumference. In the case where it is in a part, it is preferable to be at two places facing each other through at least the internal space 28.
When the constricted portions 7 and 7 are arranged in a pair, each constricted portion 7 has a predetermined shape on the curved surface of the wall portion 3 forming the second projecting portion 2 as shown in FIGS. It may be formed in a stripe shape in the width, or may be formed in a dot shape as shown in FIG. In FIG. 7 (a), the constricted portion 7 approximates the semicircular length of the outer periphery of the wall 3 but is shorter than that, and in FIG. 7 (b), the constricted portion is shorter than that of (a). 7 In the seat 10, from the viewpoint of imparting deformability due to the cushioning property described later and the spring property of the constricted portion 7, the constriction is formed in a streak shape with a predetermined width as shown in FIGS. 7 (a) and (b). preferable. With respect to this predetermined width, the semicircular length of the outer periphery of the second projecting portion 2 at the height position where the constricted portion 7 is disposed is (C), and the peripheral length of the constricted muscle of the constricted portion 7 is (D). In this case, these ratios (D / C) are preferably 0.2 to 0.9, more preferably 0.3 to 0.8, from the viewpoint of cushioning properties and the like.
 ここで上述したシート10の基本構造に基づく作用について説明する。
(クッション性及び変形性)
 シート10は表裏の片面だけではなく両面において突出した部分(第1及び第2突出部)を有する。両突出部においては、その頂部11,頂部21及びそれらの周辺が丸みのある凸レンズのような形状である。そのためシート10は、シート厚み(T)方向の押圧があっても、両面の両突出部で力が分散され、その構造に特有のクッション性を発現する。この点については、例えば従来の筋状の突起や片面の突起ではどうしても線ないし面としての弾力性を発現することとなるが、本実施形態によれば三次元的な動きに対してもよく追従して両面において点(圧力変化によって円形状に面積を増減する)で支持されたような立体的なクッション性を奏する。
 さらにシート10は、前述のとおり、壁部3に第2突出部2の内部空間28へ入り込んだ括れ部7が形成されている。括れ部7は、シート厚み(T)方向の押圧を分散し緩和する作用を奏する。例えば、第1突出部1側からの押圧は、頂部11から壁部3を伝って第2突出部2の頂部21まで及ぼうとするが、その応力が括れ部7の湾曲部分で分散されて、第2突出部2への応力伝播が緩和される。これにより、前記の丸みのある両突出部と相俟って、シート10はへたり難くなり優れたクッション性が得られる。またシート10は、平面方向の力に対しても括れ部7がそのばね性を発揮して、弾性変形と除重時の形状回復性が優れたものとなる。例えば第1突出部1側の面に平面方向の力が加わると、第1突出部1は括れ部7を起点としてその応力に柔軟に対応して変形し、また括れ部7のばね性によりもとの形状に回復され易い。他方、第2突出部2側は、括れ部7で力が緩和されるので変形が起こりにくく安定したものとなる。
 以上のようなクッション性及び変形性の維持の観点から、括れ部7は、できるだけ角の少ない丸みのある形状であることが好ましい。これにより、繰り返しの荷重に対しても括れ部7に応力が集中せずに好適に緩和され、良好なばね特性が発揮される。
Here, the operation based on the basic structure of the sheet 10 described above will be described.
(Cushioning and deformability)
The sheet 10 has portions (first and second protrusions) protruding on both sides as well as on the front and back sides. In both protrusion parts, the top part 11, the top part 21, and the periphery thereof are shaped like a convex lens with roundness. Therefore, even if the sheet 10 is pressed in the sheet thickness (T) direction, the force is distributed between the protruding portions on both sides, and the cushioning characteristic peculiar to the structure is exhibited. With regard to this point, for example, conventional line-like protrusions and single-sided protrusions will inevitably exhibit elasticity as lines or surfaces, but according to this embodiment, they also follow three-dimensional movements well. Thus, the three-dimensional cushioning is supported on both sides by points (increase or decrease the area in a circular shape by pressure change).
Further, as described above, the sheet 10 is formed with the constricted portion 7 that enters the inner space 28 of the second projecting portion 2 in the wall portion 3. The constricted portion 7 has an effect of dispersing and relaxing the pressing in the sheet thickness (T) direction. For example, the pressure from the first projecting portion 1 side tries to reach the top portion 21 of the second projecting portion 2 from the top portion 11 through the wall portion 3, but the stress is distributed at the curved portion of the constricted portion 7. The stress propagation to the second protrusion 2 is alleviated. Thereby, in combination with the rounded protrusions, the seat 10 becomes difficult to sag and an excellent cushioning property is obtained. Further, the constricted portion 7 exhibits the spring property against the force in the plane direction, and the sheet 10 is excellent in elastic deformation and shape recoverability at the time of weight removal. For example, when a planar force is applied to the surface of the first projecting portion 1, the first projecting portion 1 deforms flexibly corresponding to the stress starting from the constricted portion 7, and also due to the spring property of the constricted portion 7. It is easy to be restored to the shape. On the other hand, since the force is relieved by the constricted portion 7 on the second projecting portion 2 side, the deformation is unlikely to occur and the side is stable.
From the viewpoint of maintaining the cushioning property and the deformability as described above, the constricted portion 7 is preferably a rounded shape with as few corners as possible. Thereby, even if it repeats, a stress is not easily concentrated on the constriction part 7, but it is relieve | moderated suitably, and a favorable spring characteristic is exhibited.
(通気性)
 シート10では第1面側および第2面側それぞれの面に開放された内部空間が存在する。このシート10を吸収性物品に適用すると、開放された多数の内部空間が着用者から発生する湿気を拡散しつつ、吸収体側から発散する蒸気も効果的に拡散させることができる。
(排泄物の捕集性)
 シート10は、内部空間18及び28を有することで、吸収性物品のシート部材として用いると、排泄液や排泄物の物性に応じて多様な形態でこれらを捕集し対応することができる。例えば、図1のシート10の第1面側zを肌面側としたと想定して説明すると、粘度が高く浸透性の低い排泄物であれば、内部空間28に一時その排泄物がストックされる。また、粘度の低く拡散しやすい液であっても、複数の内部空間28に分散して一時貯蔵される。このように内部空間28に捕集された液は、前述のクッション性等によるシート10のへたり難さのために、第1面1側に液戻りし難い。また第2突出部2にある幅狭の括れ部7が、それより下方の内部空間に対する内部突起となって液の戻りを抑制するよう作用する。また、肌面にまず当たる部分が第1突出部1の頂部11であり、上記捕集された排泄液ないし排泄物は肌に接触しにくくされている。これにより、尿や便、経血やおりものの排泄ののちにも、幅広く対応して極めて良好なサラッと感じが持続される。
(Breathable)
In the sheet 10, there are open internal spaces on the first surface side and the second surface side. When this sheet 10 is applied to an absorbent article, a large number of opened internal spaces can diffuse moisture generated from the wearer, while effectively diffusing vapor emanating from the absorber side.
(Excretion collection)
Since the sheet 10 has the internal spaces 18 and 28, when used as a sheet member of the absorbent article, the sheet 10 can collect and deal with these in various forms according to the physical properties of the excretory liquid and excrement. For example, when explained by assuming that the first surface z 1 of the sheet 10 of Figure 1 and the skin face side, if a low excrement viscosity high permeability, its excrement temporary internal space 28 is Stock Is done. Even a liquid having a low viscosity and easily diffusing is dispersed and temporarily stored in the plurality of internal spaces 28. Thus, the liquid collected in the internal space 28 is difficult to return to the first surface 1 side due to the difficulty of sag of the seat 10 due to the above-described cushioning property or the like. Further, the narrow constricted portion 7 in the second projecting portion 2 acts as an internal projection for the internal space below it, and acts to suppress the return of the liquid. Moreover, the part which first hits the skin surface is the top part 11 of the 1st protrusion part 1, The said excretion liquid thru | or excrement collected are made difficult to contact skin. Thereby, after excretion of urine, stool, menstrual blood and vaginal discharge, a very good and smooth feeling can be sustained in a wide range.
 シート10の前記の通気性や捕集性に関し、高い押圧下にあっても、括れ部7は平面方向に広がらずにシート材が折り重なる積層厚み部71へと変形することが好ましい。たとえば、両面の突出部が潰れてしまうような押圧があっても、図8に示すように、括れ部7が3重の積層厚み部71となることが好ましい。この積層厚み部71が厚み方向にある程度の高さを形成するので、内部空間18及び28が部分的にでも残る。これにより、通気性が維持され、液の保持領域が残って液流出が抑制される。
 前記の積層厚み部71が好適に形成されるシート10の構造としては、シート厚みが、シート上の突起間ピッチ長さよりも薄く、またシート上の突起間ピッチ長さの4分の1よりも厚いことが好ましい。
Regarding the air permeability and collection property of the sheet 10, the constricted portion 7 is preferably deformed into a laminated thickness portion 71 in which the sheet material is folded without spreading in the plane direction even under high pressure. For example, it is preferable that the constricted portion 7 becomes a triple laminated thickness portion 71 as shown in FIG. Since the laminated thickness portion 71 forms a certain height in the thickness direction, the internal spaces 18 and 28 remain even partially. Thereby, air permeability is maintained, a liquid holding region remains, and liquid outflow is suppressed.
As the structure of the sheet 10 in which the laminated thickness portion 71 is preferably formed, the sheet thickness is thinner than the pitch length between the protrusions on the sheet, and is less than a quarter of the pitch length between the protrusions on the sheet. Thickness is preferred.
(肌触り)
 シート10には両面方向に第1及び第2の突出部があり、その頂部は丸みを帯びている。そのため肌がシート10に接触すると、その肌に対して点で柔らかく良好な肌触りが実現される。また、装着時の圧力に対しても接触する点が面状に増減することで肌触りを良好としながら、圧力に対するシート全体の形状変形を少なく抑えることができ、また、圧力変形からの形状復元も容易とすることができる。上記の良好なクッション性に起因する作用もあり、点接触のような肌との接触による作用と相俟って、独特の良好な肌触りが得られる。また、排泄等を受けたときにも、上述した点接触が効果を奏し、サラッとした肌触りが実現される。
(touch)
The sheet 10 has first and second protrusions in both directions, and the top is rounded. Therefore, when the skin comes into contact with the sheet 10, a soft and good touch is realized with respect to the skin. In addition, the contact point with the pressure at the time of mounting increases or decreases in a planar shape, making it possible to suppress the shape deformation of the entire sheet with respect to the pressure while reducing the shape deformation from the pressure deformation. Can be easy. There also exists an effect | action resulting from said favorable cushioning property, and a unique favorable touch is obtained with the effect | action by contact with skin like a point contact. Moreover, the point contact mentioned above has an effect also when excretion etc. are received, and the smooth touch is implement | achieved.
 シート10において、前述のクッション性及び変形性をより確かなものとし、これらの特性と柔らかな肌触りとを両立させるために、圧縮硬さ(LC)は、0.01~0.35が好ましく、更には0.05~0.3が、より好ましくは0.1~0.25の範囲である。シート10は、圧縮硬さ(LC)が上記の範囲であるため、適度な空隙を有することができ、柔軟性を保持しながら、高い吸収性能を達成することができる。 In the sheet 10, in order to make the above-mentioned cushioning property and deformability more reliable, and to achieve both of these characteristics and a soft touch, the compression hardness (LC) is preferably 0.01 to 0.35, Furthermore, it is 0.05 to 0.3, more preferably 0.1 to 0.25. Since the compression hardness (LC) is in the above range, the sheet 10 can have an appropriate gap, and can achieve high absorption performance while maintaining flexibility.
(圧縮硬さ(LC)の測定方法)
 シートの圧縮硬さ(LC)は、風合い計測システムKES-FB3-AUTO-A(カトーテック株式会社製、商品名)を使用して測定しできる。測定時の設定は、感度2,圧縮速さ50秒/mm、データ取込感覚0.1秒、加圧面積2cm(付属治具)とし、また測定するシートの大きさは15cm×15cmとし、測定台の中央に配置した。測定器の基準設定に従い3カ所の測定を行い、その平均値を測定値として求められる。
(Measurement method of compression hardness (LC))
The compression hardness (LC) of the sheet can be measured using a texture measurement system KES-FB3-AUTO-A (trade name, manufactured by Kato Tech Co., Ltd.). The measurement settings are: sensitivity 2, compression speed 50 seconds / mm, data capture sensation 0.1 seconds, pressurization area 2 cm 2 (attached jig), and the size of the sheet to be measured is 15 cm × 15 cm And placed in the center of the measuring table. Three points are measured according to the standard setting of the measuring instrument, and the average value is obtained as the measured value.
 さらにシート10のクッション性及び変形性について図9及び10を参照して以下に説明する。
 図9は、第1突出部と第2突出部との関係を平面視により模式的に示す説明図である。第1突出部1と第2突出部とが面内の第1方向(x)及び第2方向(y)に延びて配置された形態をモデル化して示している(x方向及びy方向は一点鎖線で図示した方向及びこれを平行移動した方向を含む。)。円で示された第1突出1及び第2突出部2(破線)はそれぞれ、その平面視の概略的な位置を示しており、その中心が頂部の頂点にほぼ一致する。図10は、接触平面を上述したような硬質の部材(例えば金属製の台座と押圧板)とみて、あるいは実際にそれを用いて、所定の圧力で押圧したときの不織布の変形状態を模式的に示した説明図である。視野としては、図2に示した断面と同様であるが、簡略化して示している。
 シート10は、非変形性の押圧面により50gf/cmの圧力で前記不織布を面方向に押圧したときにも、該押圧面と前記シートとの間の内部空間18及び28が維持されていることが好ましい。このような内部空間の維持性は第1面側もしくは第2面側のみであってもよい。これは、つまり相応の押圧を受けても適度に反発し不織布が良好なクッション性を発揮することを示している。この、50gf/cmの圧力とは、たとえば実際の吸収性物品に適用されたときに、乳幼児が着座したときの圧力に相当する圧力である。なお、本発明において圧力の測定は特に断らない限り、後記実施例に記載の手順で行った。
Further, cushioning properties and deformability of the seat 10 will be described below with reference to FIGS.
FIG. 9 is an explanatory diagram schematically showing the relationship between the first protrusion and the second protrusion in plan view. A model in which the first protrusion 1 and the second protrusion are arranged extending in the first direction (x) and the second direction (y) in the plane is shown (the x direction and the y direction are one point) Including the direction illustrated by the chain line and the direction in which it is translated). Each of the first protrusion 1 and the second protrusion 2 (broken line) indicated by a circle indicates a schematic position in plan view, and its center substantially coincides with the apex of the top. FIG. 10 is a schematic view of the deformed state of the nonwoven fabric when the contact plane is viewed as a hard member (for example, a metal base and a pressing plate) as described above, or actually pressed using a predetermined pressure. It is explanatory drawing shown in. The field of view is similar to the cross section shown in FIG. 2, but is simplified.
The sheet 10 maintains the internal spaces 18 and 28 between the pressing surface and the sheet even when the nonwoven fabric is pressed in the surface direction with a pressure of 50 gf / cm 2 by the non-deformable pressing surface. It is preferable. Such maintainability of the internal space may be only on the first surface side or the second surface side. This means that even when subjected to a corresponding pressure, the nonwoven fabric rebounds moderately and the nonwoven fabric exhibits good cushioning properties. The pressure of 50 gf / cm 2 is a pressure corresponding to the pressure when the infant is seated when applied to an actual absorbent article, for example. In the present invention, the measurement of pressure was performed according to the procedure described in the examples described below unless otherwise specified.
 シート10はさらに、非変形性の押圧面により0.5gf/cmの圧力で前記不織布を面方向に押圧したときに、該押圧面及び前記不織布の接触面積S0.5と前記押圧面の単位総面積Sa(図9参照)(面方向に1mm以上の空間がある場合、その空間は除く)との比率(S0.5/Sa)が0.1~0.4、更には0.12~0.35、特に0.15~0.3であることが好ましい。このような範囲で接触面積S0.5が押圧に対して単位総面積より小さくされているということは、図10(b)のように押圧下においても内部空間18,28が維持されていることを意味し、不織布を触ったときの柔らかさ、もしくは滑らかさ、といった優れた触感を有することを意味する。なお、0.5gf/cmの圧力とは、たとえば実際の吸収性物品に適用されたときに、着座していないときの、シートと肌との接触状態に相当する圧力である。 Further, when the non-deformable pressing surface presses the nonwoven fabric in the surface direction with a pressure of 0.5 gf / cm 2 , the sheet 10 has a contact area S 0.5 between the pressing surface and the nonwoven fabric and the pressing surface. The ratio (S 0.5 / Sa) to the unit total area Sa (see FIG. 9) (excluding the space when there is a space of 1 mm 2 or more in the surface direction) is 0.1 to 0.4, and further 0 .12 to 0.35, and particularly preferably 0.15 to 0.3. That the contact area S 0.5 is smaller than the unit total area with respect to the pressure in such a range means that the internal spaces 18 and 28 are maintained even under the pressure as shown in FIG. It means having excellent touch feeling such as softness or smoothness when touching the nonwoven fabric. The pressure of 0.5 gf / cm 2 is a pressure corresponding to a contact state between the seat and the skin when not sitting, for example, when applied to an actual absorbent article.
 なお、上記のような接触面積比率となるのは、第1面側及び第2面側の両者であることが好ましいが、片方のみであってもよい。上記単位総面積Saと接触面積S0.5との関係について少し補足すると、図9に示したように単位総面積Saは不織布内の平面視における任意の領域であればよく、好ましくは、第1突出部1及び第2突出部2が複数均等に包含される領域である。これに対して、図中の実線による円を第1突出部1の押圧面との接触部分としてみると、上記単位総面積Saにおける第1突出部の接触面積S0.5は、ハッチングをした各領域の面積の総和となる。この比率が上記接触面積比率(S0.5/Sa)となる。 Note that the contact area ratio as described above is preferably on both the first surface side and the second surface side, but may be only on one side. With little supplementary relationship between the contact area S 0.5 with the unit total area Sa, a unit total area Sa as shown in FIG. 9 may be any region in a plan view in the nonwoven fabric, preferably, the This is a region in which a plurality of the first protrusions 1 and the second protrusions 2 are evenly included. In contrast, when viewed as a contact portion between the circle of the first pressing surface of the projecting portion 1 by a solid line in the drawing, the contact area S 0.5 of the first projecting portion in the unit total area Sa was hatching This is the total area of each region. This ratio is the contact area ratio (S 0.5 / Sa).
 また、本実施形態においては、非変形性の押圧面により50gf/cmの圧力でシート10を面方向に押圧したときに、該押圧面及びシート10の接触面積S50と前記押圧面の単位総面積Saとの比率(S50/Sa)が0.3~0.9、更には0.4~0.85、特に0.5~0.8であることが好ましい。
 このような範囲で接触面積S50が押圧に対して単位総面積より小さくされているということは(図10(c)参照)、着座時などの加圧時においても不織布構造として空間が存在し、吸収性や通気性が維持されるということを意味する。なお、上記のような接触面積比率となるは、第1面側及び第2面側の両者であることが好ましいが、片方のみであってもよい。接触面積比率(S50/Sa)の見方については、表裏を異にする以外、上記接触面積比率(S0.5/Sa)と同様である。
In the present embodiment, when the sheet 10 is pressed in the surface direction with a pressure of 50 gf / cm 2 by the non-deformable pressing surface, the pressing surface and the contact area S 50 of the sheet 10 and the unit of the pressing surface. The ratio (S 50 / Sa) to the total area Sa is preferably 0.3 to 0.9, more preferably 0.4 to 0.85, and particularly preferably 0.5 to 0.8.
In this range, the contact area S 50 is smaller than the unit total area with respect to the pressing (see FIG. 10C), and there is a space as a non-woven fabric structure even during pressing such as when sitting. This means that absorbency and breathability are maintained. Note that the contact area ratio as described above is preferably on both the first surface side and the second surface side, but may be only on one side. The contact area ratio (S 50 / Sa) is viewed in the same manner as the contact area ratio (S 0.5 / Sa) except that the front and back sides are different.
 さらにシート10においては、非変形性の押圧面により0.5gf/cmの圧力で押圧したときのシート厚みT0.5が、2.5~5であることが好ましく、更には2.8~4.5であることが好ましい。また、非変形性の押圧面により50gf/cmの圧力で押圧したときのシート厚みT50が、0.5~1.3であることが好ましく、更には0.7~1.1であることが好ましい。
 さらにシート10においては、非変形性の押圧面により0.5gf/cmの圧力で押圧したときのシート厚みT0.5と、非変形性の押圧面により50gf/cmの圧力で前記不織布を面方向に押圧したときのシート厚みT50との比率(T0.5/T50)が、2.5~10であることが好ましく、更には2.5~8であることが好ましい。このようなシート厚み方向のコシを有する不織布とすることで、優れたクッション性を有するとともに、素早く液を落とし込む、また液戻りの低減化、といった吸収性能にも寄与する。
Furthermore, in the sheet 10, the sheet thickness T 0.5 when pressed by a non-deformable pressing surface with a pressure of 0.5 gf / cm 2 is preferably 2.5 to 5, and more preferably 2.8. Preferably, it is ˜4.5. Further, the sheet thickness T 50 when pressed at a pressure of 50 gf / cm 2 with a non-deformable pressing surface is preferably 0.5 to 1.3, more preferably 0.7 to 1.1. It is preferable.
In addition the sheet 10 is non-deformability of the sheet thickness T 0.5 when pressed with a pressure of 0.5 gf / cm 2 by the pressing surface, nondeformable the nonwoven fabric at a pressure of 50 gf / cm 2 by the pressing surface of the The ratio with respect to the sheet thickness T 50 (T 0.5 / T 50 ) when pressing in the surface direction is preferably 2.5 to 10, and more preferably 2.5 to 8. By using such a nonwoven fabric having a stiffness in the sheet thickness direction, it has excellent cushioning properties, and contributes to absorption performance such as dropping liquid quickly and reducing liquid return.
(厚みの測定方法)
 シート10の厚みT0.5及びT50は、風合い計測システムKES-FB3-AUTO-Aを使用して測定することができる。測定時の設定は、感度2,圧縮速さ50秒/mm、データ取込感覚0.1秒、加圧面積2cm(付属治具)とし、また測定するシートの大きさは15cm×15cmとし、測定台の中央に配置して測定する。測定器の基準設定に従い3カ所の測定とし、荷重0.5g/cm時の厚みをT0.5、荷重50g/cm時の厚みをT50とし、それぞれ3カ所の平均値を測定値とした。
(Measurement method of thickness)
The thicknesses T 0.5 and T 50 of the sheet 10 can be measured using the texture measurement system KES-FB3-AUTO-A. The measurement settings are: sensitivity 2, compression speed 50 seconds / mm, data capture sensation 0.1 seconds, pressurization area 2 cm 2 (attached jig), and the size of the sheet to be measured is 15 cm × 15 cm Measure in the center of the measuring table. According to the standard setting of the measuring device, the measurement is performed at three locations, the thickness at a load of 0.5 g / cm 2 is T 0.5 , the thickness at a load of 50 g / cm 2 is T 50, and the average value at each of the three locations is a measured value. It was.
 シート10の括れ部7が壁部3表面の周方向の一部にある場合、前述のようにシート10のクッション性や変形性を付与する観点から、括れ部7は、第2突出部2の壁部3において応力が集中し易いところに形成されることが好ましい。
 例えば、シートを賦形するために機械方向(MD方向)にシート材を搬送していくとき、シート材はMD方向に伸長され易く、CD方向に対して部材の強度が低下し易い。そのため賦形されたシートにおいて、製造時のCD方向に一致する第2突出部2の部分に応力が集中し易くなる。少なくともこの部分に括れ部7が対をなして形成されることが好ましい。特にシート10が不織布からなる場合、製造搬送時の賦形前の繊維ウェブはMD方向に繊維が配向する傾向にあるため、括れ部7はCD方向にあることが好ましい。なお、「MD」はシート材が製造時に流れる方向をいい、「Machine Direction」の略語である。流れ方向ともいう。「CD」は上記MDにシート面内方向で直交する方向であり、「Cross Direction」の略語である。
When the constricted part 7 of the seat 10 is in a part of the circumferential direction of the surface of the wall part 3, the constricted part 7 is formed from the second projecting part 2 from the viewpoint of providing cushioning and deformability of the sheet 10 as described above. The wall 3 is preferably formed where stress is likely to concentrate.
For example, when a sheet material is conveyed in the machine direction (MD direction) in order to shape the sheet, the sheet material is easily stretched in the MD direction, and the strength of the member is likely to decrease in the CD direction. Therefore, in the shaped sheet, stress tends to concentrate on the portion of the second protrusion 2 that matches the CD direction at the time of manufacture. It is preferable that the constricted portion 7 is formed in pairs at least at this portion. In particular, when the sheet 10 is made of a nonwoven fabric, the constricted portion 7 is preferably in the CD direction because the fiber web before shaping at the time of manufacture and conveyance tends to have the fibers oriented in the MD direction. “MD” refers to the direction in which the sheet material flows during manufacture, and is an abbreviation for “Machine Direction”. Also called flow direction. “CD” is a direction orthogonal to the MD in the sheet in-plane direction, and is an abbreviation of “Cross Direction”.
 また同様の観点から、第2突出部2の内部空間28の平面形状が長軸及び短軸を有する環形状であると、短軸方向に応力が集中し易い。そのため、第2突出部2の短軸方向に、括れ部7が少なくとも対をなして形成されることが好ましい。例えば図11に示すような形態が挙げられる。図11は、長軸及び短軸のある楕円平面形状を有する第2突出部を模式的に示す説明図であり、(a)は平面図であり、(b)は正面図であり、(c)は断面側面図である。図11に示すように、平面形状が長軸m及び短軸nを有する楕円形状である場合、第2突出部2の壁部3の短軸n方向に括れ部7,7が形成されることが好ましい。 From the same viewpoint, if the planar shape of the internal space 28 of the second protrusion 2 is an annular shape having a major axis and a minor axis, stress tends to concentrate in the minor axis direction. Therefore, it is preferable that the constricted portions 7 are formed at least in pairs in the minor axis direction of the second projecting portion 2. For example, a form as shown in FIG. FIG. 11 is an explanatory view schematically showing a second protrusion having an elliptical planar shape with a major axis and a minor axis, (a) is a plan view, (b) is a front view, and (c) ) Is a cross-sectional side view. As shown in FIG. 11, when the planar shape is an elliptical shape having a major axis m and a minor axis n, the constricted portions 7 and 7 are formed in the minor axis n direction of the wall 3 of the second projecting portion 2. Is preferred.
 次に、上記のような形状と特性を有するシート10の形成素材について説明する。
 シート10の形成素材としては、前述の形状が得られるのであれば、この種の物品に用いられる各種のシート材を用いることができる。例えば、不織布、フィルム、織り布、紙等が挙げられる。また、これらの同種又は異類の素材を複数組み合わせた複合シートであってもよい。
 シート10を吸収性物品に適用する際、その部材の機能に合わせて素材や性質を適宜選択することが好ましい。たとえば、液保持性の吸収体の肌当接面側にある表面シートや中間シートあるいは吸収性コアの被覆シートである場合は、液透過性のシートであることが好まし。吸収体よりも非肌当接面側に配されるシートである場合は、透湿性又は防漏性のシートであることが好ましい。また液の横漏れ防止のためのサイドシートとする場合は、撥水性のシートであることが好ましい。
Next, a material for forming the sheet 10 having the above shape and characteristics will be described.
As the material for forming the sheet 10, various sheet materials used for this type of article can be used as long as the above-described shape can be obtained. For example, a nonwoven fabric, a film, a woven fabric, paper, etc. are mentioned. Further, a composite sheet in which a plurality of these same or different materials are combined may be used.
When the sheet 10 is applied to an absorbent article, it is preferable to appropriately select materials and properties in accordance with the function of the member. For example, in the case of a surface sheet or intermediate sheet on the skin contact surface side of a liquid-retaining absorbent body or a covering sheet of an absorbent core, a liquid-permeable sheet is preferred. In the case where the sheet is disposed on the non-skin contact surface side with respect to the absorbent body, the sheet is preferably a moisture-permeable or leak-proof sheet. Moreover, when it is set as the side sheet | seat for preventing the side leakage of a liquid, it is preferable that it is a water-repellent sheet | seat.
 シート10を表面シート等の液透過性の部材として吸収性物品に適用する場合、シート10の第一面側を肌当接面側に配することが好ましい。つまり、括れ部7のある第2突出部2は非肌当接面側となる。これにより、括れ部7による、シート10の排泄物の捕集性や後述の液透過性、液拡散性、液戻り防止性、吸収性能を発揮させることができる。 When the sheet 10 is applied to an absorbent article as a liquid-permeable member such as a top sheet, it is preferable to arrange the first surface side of the sheet 10 on the skin contact surface side. That is, the 2nd protrusion part 2 with the narrow part 7 becomes a non-skin contact surface side. Thereby, the collection property of the excrement of the sheet | seat 10 by the narrow part 7, and the below-mentioned liquid permeability, liquid diffusibility, liquid return prevention property, and absorption performance can be exhibited.
 不織布としては、エアスルー不織布、スパンボンド不織布、スパンレース不織布、メルトブローン不織布等のものを用いることができる。その素材としては、特に限定されず、例えば次の繊維などが挙げられる。ポリエチレン(PE)繊維、ポリプロピレン(PP)繊維等のポリオレフィン繊維;ポリエチレンテレフタレート(PET)、ポリアミド等の熱可塑性樹脂を単独で用いてなる繊維;芯鞘型、サイドバイサイド型等の構造の複合繊維、例えば鞘成分がポリエチレン又は低融点ポリプロピレンである芯鞘構造の繊維が好ましく挙げられ、該芯/鞘構造の繊維の代表例としては、PET(芯)/PE(鞘)、PP(芯)/PE(鞘)、PP(芯)/低融点PP(鞘)等の芯鞘構造の繊維。更に具体的には、上記構成繊維は、ポリエチレン繊維、ポリプロピレン繊維等のポリオレフィン系繊維、ポリエチレン複合繊維、ポリプロピレン複合繊維を含むのが好ましい。ここで、該ポリエチレン複合繊維の複合組成は、ポリエチレンテレフタレート/ポリエチレンであり、該ポリプロピレン複合繊維の複合組成が、ポリエチレンテレフタレート/低融点ポリプロピレンであるのが好ましく、より具体的には、PET(芯)/PE(鞘)、PET(芯)/低融点PP(鞘)が挙げられる。また、これらの繊維は、単独で用いて不織布を構成してもよいが、2種以上を組み合わせて用いることもできる。
 不織布からなるシートを吸収性物品の表面シートとして用いる場合には、親水性の不織布又は親水化処理された不織布が好ましい。またサイドシートとして用いる場合には、撥水性の不織布が好ましい。吸収体の非肌当接面側にある裏面シート等のシートとして用いる場合は、防漏性の観点から不織布をフィルム(透湿性/非透湿性)と組み合わせることが好ましい。
As the nonwoven fabric, air-through nonwoven fabric, spunbond nonwoven fabric, spunlace nonwoven fabric, melt blown nonwoven fabric and the like can be used. The material is not particularly limited, and examples thereof include the following fibers. Polyolefin fibers such as polyethylene (PE) fibers and polypropylene (PP) fibers; fibers using a thermoplastic resin such as polyethylene terephthalate (PET) and polyamide alone; composite fibers having a structure such as a core-sheath type and a side-by-side type, such as A core-sheath structure fiber in which the sheath component is polyethylene or low-melting-point polypropylene is preferable, and typical examples of the core / sheath structure fiber include PET (core) / PE (sheath), PP (core) / PE ( Sheath), fibers having a core-sheath structure such as PP (core) / low melting point PP (sheath). More specifically, the constituent fibers preferably include polyolefin fibers such as polyethylene fibers and polypropylene fibers, polyethylene composite fibers, and polypropylene composite fibers. Here, the composite composition of the polyethylene composite fiber is polyethylene terephthalate / polyethylene, and the composite composition of the polypropylene composite fiber is preferably polyethylene terephthalate / low melting point polypropylene, and more specifically, PET (core). / PE (sheath), PET (core) / low melting point PP (sheath). These fibers may be used alone to form a nonwoven fabric, but may be used in combination of two or more.
When using the sheet | seat which consists of a nonwoven fabric as a surface sheet of an absorbent article, a hydrophilic nonwoven fabric or the nonwoven fabric by which the hydrophilic treatment was carried out is preferable. Moreover, when using as a side sheet, a water-repellent nonwoven fabric is preferable. When used as a sheet such as a back sheet on the non-skin contact surface side of the absorbent body, it is preferable to combine a non-woven fabric with a film (moisture permeable / non-moisture permeable) from the viewpoint of leakage prevention.
 フィルムとしては、例えば、ポリエチレンやポリプロピレン等の合成樹脂を用いたものが挙げられる。また前記不織布と張り合わせたシートとしてもよい。
 フィルムからなるシートを吸収性物品の裏面シート等に用いる場合、防漏性と透湿性との両立の観点から、例えば疎水性の熱可塑性樹脂と、炭酸カルシウム等からなる微小な無機フィラー又は相溶性のない有機高分子等とを溶融混練してフィルムを形成し、該フィルムを一軸又は二軸延伸して得られる多孔性フィルムなどが好ましい。また表面シート等に用いる場合は、液透過性の観点から親水性微細孔フィルムなどが好ましい。またフィルムを表面シートやサイドシートなどに用いる場合、肌に直接触れるため、肌ざわりの観点から布様の感触にあるようなエンボス加工が施されていることが好ましい。
As a film, the thing using synthetic resins, such as polyethylene and a polypropylene, is mentioned, for example. Moreover, it is good also as a sheet | seat bonded together with the said nonwoven fabric.
When using a sheet made of a film as a back sheet of an absorbent article, etc., from the viewpoint of both leakage prevention and moisture permeability, for example, a hydrophobic thermoplastic resin, a minute inorganic filler made of calcium carbonate or the like, or compatibility A porous film obtained by melt-kneading an organic polymer or the like without a film to form a film and stretching the film uniaxially or biaxially is preferable. Moreover, when using for a surface sheet etc., a hydrophilic microporous film etc. are preferable from a liquid-permeable viewpoint. Moreover, when using a film for a surface sheet, a side sheet, etc., since it touches skin directly, it is preferable that the embossing which has a cloth-like touch is given from the viewpoint of the touch.
 シート10を上記の形成素材を用いて表面シート等の液透過性のシートとし、該シート10を吸収性物品に適用する場合、前述の形状と相俟って、さらに以下のような作用を奏する。
(吸収性能(液透過性、液拡散性、液戻り防止性など))
 シート10は、第2面側にも第1突出部1に対応した内部空間18を有する。シート10を吸収性物品の表面シート等として第1面側を肌当接面に配すると、吸収体等の下層部材との間に第1突出部1の内部空間18が配置される。この場合、排泄物は、第2突出部2の内部空間28に一時貯蔵されるものもあれば、頂部11及び壁部3を介して第2面側に透過され、第1突出部1の内部空間18に捕集されるものもある。つまり、シート10は、液を肌から遠ざけつつ非肌面側へと透過させ、その位置で多くの液を一時貯蔵できるので液透過性に優れたものとなる。
 さらに第2突出部2が有する括れ部7は、前述のとおりそのばね性によって内部空間を保持するとともに内部空間28の中蓋のようになる。括れ部7のこのような作用によって、第1面側への液戻りが抑制されるとともに、内部空間28内で下層への力が働き液を第2面側へと押出し易くする。これにより液は、シート10の非肌当接面側へと透過されやすく、吸収体等の下層の部材との間で拡散されやすくなる。つまりシート10は、液透過性、液拡散性、液戻り防止性に優れたものとなる。
When the sheet 10 is made into a liquid-permeable sheet such as a surface sheet using the above-described forming material, and the sheet 10 is applied to an absorbent article, the following effects are further obtained in combination with the above-described shape. .
(Absorption performance (liquid permeability, liquid diffusibility, liquid return prevention, etc.))
The sheet 10 also has an internal space 18 corresponding to the first protrusion 1 on the second surface side. When the sheet 10 is used as a surface sheet or the like of the absorbent article and the first surface side is disposed on the skin contact surface, the internal space 18 of the first projecting portion 1 is disposed between the lower member such as the absorbent body. In this case, the excrement may be temporarily stored in the internal space 28 of the second projecting portion 2, or may be transmitted to the second surface side through the top portion 11 and the wall portion 3, and the interior of the first projecting portion 1. Some are collected in the space 18. That is, the sheet 10 is excellent in liquid permeability because it allows the liquid to permeate to the non-skin surface side while keeping it away from the skin and can temporarily store a large amount of liquid at that position.
Further, the constricted portion 7 included in the second projecting portion 2 retains the internal space by its spring property as described above and becomes like an inner lid of the internal space 28. By such an action of the constricted portion 7, the liquid return to the first surface side is suppressed, and the force to the lower layer works in the internal space 28 to facilitate the extrusion of the liquid to the second surface side. Thereby, the liquid is easily transmitted to the non-skin contact surface side of the sheet 10 and is easily diffused between lower-layer members such as the absorber. That is, the sheet 10 is excellent in liquid permeability, liquid diffusibility, and liquid return preventing property.
 以上のとおりシート10は、上記のクッション性や括れ部7のばね性等に起因する内部空間の保持によって、内部空間から肌面側への液戻りを抑制することができる。また括れ部7によって液の吸収体側への押出し作用が働き、表面シートから吸収体への吸収速度を速く維持できる。またシート10を表面シートとすると下層の吸収体にかかる圧力が適度に分散され形状復元力が大きいことから、吸収体からの液戻り量が低減される。加えて過吸収状態の場合などに吸収体から液が溢れてきた際には、まだ吸収に余裕のある他の吸収部位に、前記内部空間18により適切に液が拡散する。したがってシート10は、吸収性能の安定性の高いものとなる。 As described above, the seat 10 can suppress liquid return from the internal space to the skin surface side by holding the internal space due to the above-described cushioning property, the spring property of the constricted portion 7, and the like. Further, the constricted portion 7 acts to push the liquid toward the absorber, and the absorption speed from the top sheet to the absorber can be maintained fast. Further, when the sheet 10 is a top sheet, the pressure applied to the lower absorbent body is appropriately dispersed and the shape restoring force is large, so that the liquid return amount from the absorbent body is reduced. In addition, when the liquid overflows from the absorbent body in the case of an overabsorbing state, the liquid is appropriately diffused by the internal space 18 to other absorption sites that still have room for absorption. Therefore, the sheet 10 has high absorption performance stability.
 次に、シート10が不織布からなる場合について以下に詳述する。不織布は、液透過性等の吸収性能を高め、繰り返しの押圧にも耐えてクッション性や変形性などを維持させる観点から好ましい。特に、詳細については後述するが、シート10の壁部3においてはその壁の起立する方向に向け配向した不織布繊維の配向性を有することが好ましい。このように配向した繊維部分にしっかりとしたコシが生まれ、繊維が厚み方向に潰れてしまうことのない適度のクッション性を実現する。さらに、上述した壁部3の繊維配向性により、押圧力を受けて不織布が潰されても、その形状復元力が大きく、梱包状態や着用が継続されても初期のクッション性を喪失しにくい。また、壁部3の括れ部7においては、不織布の繊維の隙間があることによってより柔軟に動きやすく応力緩和され、ばね性がより効果的に発揮され易い。 Next, the case where the sheet 10 is made of a nonwoven fabric will be described in detail below. Nonwoven fabrics are preferred from the viewpoint of enhancing absorption performance such as liquid permeability and withstanding repeated pressing to maintain cushioning and deformability. In particular, although details will be described later, the wall portion 3 of the sheet 10 preferably has the orientation of the nonwoven fabric fibers oriented in the direction in which the wall stands up. A firm stiffness is born in the fiber portion thus oriented, and an appropriate cushioning property is realized without the fiber being crushed in the thickness direction. Furthermore, even if the nonwoven fabric is crushed by receiving the pressing force due to the fiber orientation of the wall portion 3 described above, the shape restoring force is large, and even if the packing state and wearing are continued, the initial cushioning property is not easily lost. Moreover, in the constricted part 7 of the wall part 3, since there exists the clearance gap between the fibers of a nonwoven fabric, it is easy to move more flexibly and stress is relieve | moderated and a spring property is easy to be exhibited more effectively.
 上記の繊維配向性を含め不織布からなるシート10のより詳細な特徴について、その形状をモデルとして簡略化して示した図12~14に基づいて説明する。以下、不織布からなるものを不織布シート10として説明する。不織布シート10には第1突出部1(実施線で示した)と第2突出部2(破線で示した)とがあり、図9ではそれらがそれぞれ単純な円として示されている。それらの円の大きさは、区別のため若干異なるものとしており、図1等に示した形態とその寸法等において一致するものではない。不織布シート10においては、第1突出部1と第2突出部2とが格子状配列になって配置されている。これを、別の言い方で示すと、所定方向に第1列k、第2列k、第3列k、としてみたとき、各列の第1突出部1と第2突出部2とは交互に配置されており、各列の突出部をシート面内で各列に斜交する方向(y方向)に投影したときに、隣接する列において第1突出部と第2突出部とが重なる関係となる。さらに言うと、第n列と第n+2列において、第1突出部1と第2突出部2とがそれぞれ重なる状態とされている。つまり、本実施形態においては、列kの第1突出部及び第2突出部がy方向に平行移動したとき、列kの第1突出部及び第2突出部と重なる関係とされている。ただし、本発明がこれに限定して解釈されるものではなく、上記隣接する第1突出部と第2突出部とにずれがあってもよい。 More detailed features of the sheet 10 made of a nonwoven fabric including the above fiber orientation will be described with reference to FIGS. 12 to 14 in which the shape is simplified as a model. Hereinafter, what consists of a nonwoven fabric is demonstrated as the nonwoven fabric sheet 10. FIG. The nonwoven fabric sheet 10 has a first protruding portion 1 (shown by an execution line) and a second protruding portion 2 (shown by a broken line), which are shown as simple circles in FIG. The sizes of these circles are slightly different for distinction, and do not coincide with the form shown in FIG. In the nonwoven fabric sheet 10, the 1st protrusion part 1 and the 2nd protrusion part 2 are arrange | positioned by the grid | lattice-like arrangement | sequence. In other words, when the first row k 1 , the second row k 2 , and the third row k 3 are viewed in a predetermined direction, the first protrusion 1 and the second protrusion 2 in each row Are alternately arranged, and when the protrusions of each row are projected in a direction (y direction) oblique to each row within the sheet surface, the first protrusions and the second protrusions are adjacent in the adjacent rows. Overlapping relationship. More specifically, the first protrusion 1 and the second protrusion 2 overlap each other in the n-th row and the (n + 2) -th row. That is, in the present embodiment, when the first protrusion and the second protrusion of the column k 1 is moved parallel to the y-direction, there is a superimposed relation to the first protrusions and second protrusions of the row k 3 . However, the present invention is not construed as being limited to this, and there may be a shift between the adjacent first protrusion and second protrusion.
 第1突出部1と第2突出部2との間には、これらの共有部分として壁部3が形成されている。図12に示した中央の第1突出部1でみると、四方の第2突出部2から連続してくる4つの壁部部分31、32、33、34が形成されている。そして、その4つの壁部部分31~34はシート面内方向で壁部部分31’、32’、33’、34’で連繋されており、一連になり環状の壁部3が構成されている。前記壁部部分31’、32’、33’、34’の第1面側で隣接する第1突出部との間には馬の背になった稜線部分が存在し、その部分が尾根部6となり上記壁部部分31’~34’のそれぞれに対応して、尾根部61~64が形成されている。 Between the 1st protrusion part 1 and the 2nd protrusion part 2, the wall part 3 is formed as these shared parts. When viewed from the central first protrusion 1 shown in FIG. 12, four wall portions 31, 32, 33, and 34 that are continuous from the four second protrusions 2 are formed. The four wall portions 31 to 34 are connected by wall portions 31 ′, 32 ′, 33 ′, and 34 ′ in the in-plane direction of the sheet to form an annular wall portion 3 in series. . There is a ridge portion which is the back of the horse between the first protrusions adjacent on the first surface side of the wall portions 31 ′, 32 ′, 33 ′, 34 ′, and that portion becomes the ridge portion 6. Corresponding to each of the wall portions 31 ′ to 34 ′, ridge portions 61 to 64 are formed.
 図13(a)は図12に示した壁部3を展開して長方形のモデルで示したものであり、そこに図示された線gは繊維の配向方向を示している。壁部部分の位置を表すために、さらに、上記環状の壁部を円柱として、その母船に直交する面で切断した横断面でみたときに90°ごとに異なる位置として31~34の符号を加入して示している。図13(a)に示したように、本実施形態の壁部3はいずれの箇所においても壁部の起立方向に配向している。そして、本実施形態においては、0°位置(壁部部分31)と180°位置(壁部部分33)は第2面側(z)側に偏倚した状態でその強い配向性(線g1b)を示す部分が位置しており、他方、90°位置(壁部部分32)と270°位置(壁部部分34)は第1面側(z)側に偏倚した状態でその強い配向性(線g1a)を示す部分が位置している。同図では図が混み合うため図示していないが、壁部部分31’~34’においても同様であり、全面的に同様の繊維配向性を有している。ただし、強い配向性を示す壁部部分は31、32、33、34と変化するその中間位置で全体において漸次変化する環状の壁部の配向性の構造を構成している。これにより本実施形態において特有のクッション性を生じることは前述のとおりであり。
 一方、例えば、繊維ウェブを賦形する前に融着し所定の配向性が与えられた従来の不織布にエンボス加工等によりくぼみを与えた場合は、通常図13(b)のように環状の壁部を平面視において90°ごとに分割してみると、その分割位置ごとに繊維配向性が変わることとなる。具体的には同図に示したとおり壁部部分31、33ではその起立方向(線g1c)に繊維が配向するが、壁部部分32、34ではそれと直交する方向(線g)に繊維が配向する。
13 (a) is an illustration a rectangular model expand wall 3 shown in FIG. 12, line g 1 illustrated therein represents the orientation direction of the fibers. In order to represent the position of the wall portion, the reference numerals 31 to 34 are added as positions that differ every 90 ° when viewed in a cross section cut along a plane orthogonal to the mother ship, with the annular wall portion as a cylinder. As shown. As shown to Fig.13 (a), the wall part 3 of this embodiment is orientated in the standing direction of the wall part in any location. In the present embodiment, the 0 ° position (wall portion 31) and the 180 ° position (wall portion 33) are biased toward the second surface side (z 2 ) and have a strong orientation (line g 1b). ), And the 90 ° position (wall portion 32) and the 270 ° position (wall portion 34) are strongly oriented in a state of being biased to the first surface side (z 1 ) side. A portion indicating (line g 1a ) is located. Although not shown in the figure because the figures are crowded, the same applies to the wall portions 31 ′ to 34 ′, and the same fiber orientation is obtained over the entire surface. However, the wall portion showing a strong orientation constitutes an orientation structure of an annular wall portion that gradually changes as a whole at the intermediate positions changing as 31, 32, 33, and 34. As described above, this produces a cushioning characteristic peculiar to the present embodiment.
On the other hand, for example, when a conventional nonwoven fabric that has been fused and given a predetermined orientation before being shaped is given a depression by embossing or the like, an annular wall is usually used as shown in FIG. When the portion is divided every 90 ° in plan view, the fiber orientation changes at each division position. Specifically, the fibers are oriented in the standing direction (line g 1c ) in the wall portions 31 and 33 as shown in the figure, whereas the fibers are oriented in the direction (line g 2 ) perpendicular to the wall portions 32 and 34. Are oriented.
 図14は図12に示した第2突出部2を1つ取り出した状態で繊維の配向方向(線g)をモデル的に示している。その位置を特定するために壁部部分の符号をその対応する位置に付している。同図に示したとおり、本実施形態においては、第2突出部2の頂部21に向かって収束する放射状の繊維配向性を有している。このことはつまり、上記壁部との関係を併せていうと、壁部3から第2突出部2にわたってそのシート面の面方向に沿って第2突出部の頂部21に向かって収束するように繊維が配向していることを示している。このように、第2突出部頂部21に放射上の繊維配向性があることで、外観の均一性、形状保持性および高吸収性能などという作用を奏する。 FIG. 14 schematically shows the fiber orientation direction (line g 3 ) in a state where one second protruding portion 2 shown in FIG. 12 is taken out. In order to specify the position, the code | symbol of a wall part is attached | subjected to the corresponding position. As shown in the figure, in this embodiment, the fiber has a radial fiber orientation that converges toward the top 21 of the second protrusion 2. In other words, when the relationship with the wall portion is mentioned together, the fibers are converged from the wall portion 3 to the second protrusion portion 2 so as to converge toward the top portion 21 of the second protrusion portion along the surface direction of the sheet surface. Is oriented. Thus, there exists an effect | action of uniformity of an external appearance, shape retainability, high absorption performance, etc. by having the fiber orientation in radiation | emission in the 2nd protrusion part top part 21. FIG.
 上記の不織布シート10の製造方法はこの種の製品に一般的な方法を適宜採用すればよい。一例を挙げると、下記のような態様が挙げられる。融着する前の繊維ウェブを、所定の厚みとなるようカード機からウェブ賦形装置に供給する。ウェブ賦形装置では、まず常温(約23℃)の空気を供給して、多数の突起9(図2参照)を有し通気性を有する台座(図示せず)の上に上記繊維ウェブを定着させる。次いで、その台座上の繊維ウェブに熱風h(図2参照)を各繊維が適度に融着可能な温度で吹きつけて、前記台座上の突起9にそって繊維ウェブを賦形するとともに、各繊維を融着させる。このときの熱風の温度は、この種の製品に用いられる一般的な繊維材料を考慮すると、130~160℃にすることが好ましく、風速は20~80m/sにすることが好ましい。 The method for manufacturing the nonwoven fabric sheet 10 may be a method generally used for this type of product as appropriate. If an example is given, the following aspects will be mentioned. The fiber web before being fused is supplied from the card machine to the web shaping device so as to have a predetermined thickness. In the web shaping apparatus, first, air at normal temperature (about 23 ° C.) is supplied, and the fiber web is fixed on a pedestal (not shown) having a large number of protrusions 9 (see FIG. 2) and air permeability. Let Next, hot air h (see FIG. 2) is blown onto the fiber web on the pedestal at a temperature at which each fiber can be appropriately fused, and the fiber web is shaped along the protrusions 9 on the pedestal. The fibers are fused. The temperature of the hot air at this time is preferably 130 to 160 ° C. and the wind speed is preferably 20 to 80 m / s in consideration of a general fiber material used for this type of product.
 さらに上記の不織布シート10に括れ部7を形成する方法の一例として、ニップロールによる押圧加工が挙げられる。上記型賦形加工された不織布の状態に応じ、線圧20~50kg/cmで押圧することが好ましい。 Furthermore, as an example of a method for forming the constricted portion 7 on the nonwoven fabric sheet 10 described above, pressing with a nip roll can be cited. It is preferable to press at a linear pressure of 20 to 50 kg / cm according to the state of the above-mentioned non-woven fabric.
 連続生産を考慮すると、上記台座を搬送可能なコンベア式のものとし、搬送されてくる型付けされた不織布を、ロールで巻き取っていく態様が挙げられる。なお上記括れの形成は、上記賦形加工の直後に行ってもよく、または上記賦形加工された不織布をいったんロールに巻き取り、おむつや生理用品等の物品に加工する際に、括れ加工を行ってもよい。 Considering continuous production, there is a mode in which the pedestal is transportable and the typed nonwoven fabric that is being conveyed is wound up by a roll. The formation of the constriction may be performed immediately after the shaping process, or the constriction process may be performed when the shaped non-woven fabric is once wound on a roll and processed into an article such as a diaper or a sanitary product. You may go.
 本実施形態のシート10における寸法諸元について以下に説明する。
 シートの厚さについては、シート10の全体としてみたときの厚さをシート厚み(T)といい、その凹凸に湾曲したシートの局部的な厚さを層厚み(S)として区別する(図2参照)。シート厚み(T)は用途によって適宜調節すればよいが、おむつや生理用品等の表面シートとして用いることを考慮すると、1.0mm~4.5mmが好ましく、1.5mm~4.2mmがより好ましい。その範囲とすることにより、適度な立体感のある良好な外観と、優れた吸収性能を両立することができる。層厚みは、シート内の各部位において異なっていてよく、用途によって適宜調節すればよい。おむつや生理用品等の表面シートとして用いることを考慮すると、第1突出部頂部の層厚み(S)は0.1mm~1mmであることが好ましく、0.2mm~0.8mmがより好ましい。好ましい層厚みの範囲としては第2突出部頂部の層厚み(S)及び壁部の層厚み(S)も同様である。
 本実施形態の不織布10においては、第1突出部1の層厚みS、第2突出部の層厚みS、及び壁部の層厚みSは、実質的に同じである。ここで実質的に同じとは、それぞれの断面を観察したときに、ほぼ同じ厚みであることを意味する。このような形態の不織布とすることにより、外観の均一性、および安定した吸収性能およびクッション性を得ることができ好ましい。
The dimensions of the sheet 10 according to this embodiment will be described below.
Regarding the thickness of the sheet, the thickness of the sheet 10 as a whole is referred to as the sheet thickness (T), and the local thickness of the sheet curved in the unevenness is distinguished as the layer thickness (S) (FIG. 2). reference). The sheet thickness (T) may be appropriately adjusted depending on the use, but considering use as a surface sheet for diapers, sanitary products, etc., 1.0 mm to 4.5 mm is preferable, and 1.5 mm to 4.2 mm is more preferable. . By setting it as the range, it is possible to achieve both a good appearance with an appropriate stereoscopic effect and an excellent absorption performance. The layer thickness may be different at each site in the sheet, and may be appropriately adjusted depending on the application. In consideration of use as a surface sheet for diapers, sanitary products, etc., the layer thickness (S 1 ) at the top of the first protrusion is preferably 0.1 mm to 1 mm, and more preferably 0.2 mm to 0.8 mm. The preferred layer thickness ranges are the same for the layer thickness (S 2 ) at the top of the second protrusion and the layer thickness (S 3 ) at the wall.
In the nonwoven fabric 10 of the present embodiment, the layer thickness S 1 of the first projecting portion 1, the layer thickness S 3 of layer thickness S 2, and the wall portion of the second projecting portion are substantially the same. Here, “substantially the same” means that the thickness is substantially the same when each cross section is observed. By setting it as the nonwoven fabric of such a form, the uniformity of an external appearance and the stable absorption performance and cushioning property can be obtained, and it is preferable.
 シート10は乾燥時と湿潤時で厚みがほぼ変化しないことが好ましい。すなわち、下記厚み変化率において85~115%であることが好ましく、更には90~110%であることがより好ましい。
 厚み変化率(%)
  =湿潤時厚み(mm)/乾燥時厚み(mm)×100 (数式1)
・乾燥時厚み
 常温(23℃、50%RH)環境下に24時間静置した後の、シートの厚み。
・湿潤時厚み
 シートを、常温(23℃、50%RH)環境下に24時間静置する。シートより大きい平面状の容器に、イオン交換水を10mmの高さになるまで入れる。この容器にシートを入れ、1時間後に取り出す。このシートの厚み。
It is preferable that the thickness of the sheet 10 does not substantially change between when it is dried and when it is wet. That is, it is preferably 85 to 115%, more preferably 90 to 110%, in the following thickness change rate.
Thickness change rate (%)
= Wet thickness (mm) / Dry thickness (mm) x 100 (Equation 1)
-Thickness at the time of drying The thickness of the sheet after standing for 24 hours in a normal temperature (23 ° C, 50% RH) environment.
-Thickness when wet The sheet is allowed to stand in a normal temperature (23 ° C., 50% RH) environment for 24 hours. Ion exchange water is put into a flat container larger than the sheet until the height becomes 10 mm. The sheet is put into this container and taken out after 1 hour. The thickness of this sheet.
 第1突出部1及び第2突出部2がなす列の間隔は、用途によって適宜調節すればよいが、おむつや生理用品等の表面シートとして用いることを考慮すると、1mm~12mmが好ましく、2.5mm~6mmがより好ましい。 The distance between the rows formed by the first protrusions 1 and the second protrusions 2 may be appropriately adjusted depending on the application, but is preferably 1 mm to 12 mm in consideration of use as a surface sheet for diapers, sanitary products, and the like. 5 mm to 6 mm is more preferable.
 次にシート10の吸収性物品への適用例につき、図15を参照して説明する。
 図15は、シート10を適用した使い捨ておむつ100を一部切欠して模式的に示す斜視図である。同図に示したおむつはテープ型の乳幼児用使い捨ておむつであり、平面に展開した状態のおむつを多少曲げて内側(肌当接面側)からみた状態で示している。
Next, an application example of the sheet 10 to the absorbent article will be described with reference to FIG.
FIG. 15 is a perspective view schematically showing a disposable diaper 100 to which the sheet 10 is applied with a part cut away. The diaper shown in the figure is a tape-type disposable diaper for infants, and is shown in a state where a diaper developed in a plane is bent slightly and viewed from the inside (skin contact surface side).
 本実施形態の使い捨ておむつ100は、肌当接面側に配置される液透過性の表面シート10と、非肌当接面側に配置される液不透過性のバックシート81と、これらの間に介在する吸収体83とを有する(図15参照)。表面シートとしては上記実施形態のシート10が適用され、その第1突出面側が肌当接面とされている。本実施形態においては、バックシート81と表面シート10との間に吸収体83が介在配置されている。バックシート81は展開状態で、その両側縁が長手方向中央部cにおいて内側に括れた略砂時計形の形状を有しており、1枚のシートからなるものであっても、複数のシートからなるものであってもよい。本実施形態においては、サイドシート85がなす横漏れ防止ギャザー82が設けられており、これにより乳幼児の運動等による股関節部分における液体等の横漏れを効果的に防止しうる。本実施形態のおむつにおいては、さらに機能的な構造部やシート材等を設けてもよい。なお、図15においては各部材の配置関係や境界を厳密には図示しておらず、この種のおむつの一般的な形態とされていれば特にその構造は限定されない。 The disposable diaper 100 of the present embodiment includes a liquid-permeable top sheet 10 disposed on the skin contact surface side, a liquid-impermeable back sheet 81 disposed on the non-skin contact surface side, and a space therebetween. (See FIG. 15). The sheet 10 of the above embodiment is applied as the top sheet, and the first protruding surface side is a skin contact surface. In the present embodiment, an absorber 83 is interposed between the back sheet 81 and the top sheet 10. The back sheet 81 is in the unfolded state, and has a substantially hourglass shape in which both side edges are confined inward in the longitudinal center c, and the back sheet 81 is composed of a plurality of sheets even if it is composed of one sheet. It may be a thing. In the present embodiment, a side leakage preventing gather 82 formed by the side seat 85 is provided, and thereby side leakage of liquid or the like in the hip joint part due to an infant's exercise or the like can be effectively prevented. In the diaper of this embodiment, a functional structure part, a sheet material, etc. may be provided. In addition, in FIG. 15, the arrangement | positioning relationship and boundary of each member are not illustrated strictly, and if it is set as the general form of this kind of diaper, the structure will not be specifically limited.
 本実施形態のおむつ100はテープ型のものとして示しており、背側rのフラップ部にはファスニングテープ86が設けられている。このテープ86を腹側fのフラップ部に設けたテープ貼付部(図示せず)に貼付して、おむつを装着固定することができる。このとき、おむつ中央cを緩やかに内側に折り曲げて、吸収体83が乳幼児の臀部から下腹部にわたって沿わされるように着用する。これにより排泄物が的確に吸収体83に吸収保持される。このような形態で用いることにより、特にシート10を表面シートとして適用したことによる良好な肌触り、クッション性、排泄物の捕集性を示す。特におむつ100において、排泄物の捕集性については、従来の線状の突出物の表面シートや小孔の開いたものでは達成できない極めて高い性能を実現することができ、例えば、乳幼児の肌を下痢便や軟便等による肌荒れから好適に保護することできる。
 さらにおむつ100は、シート10のクッション性や括れ部7のばね性等に起因する内部空間の保持によって、内部空間から肌面側への液戻りを抑制することができる。また括れ部7によって液の吸収体側への押出し作用が働き、表面シートから吸収体への吸収速度を速く維持できる。またシート10は下層の吸収体にかかる圧力を適度に分散し形状復元力が大きいことから、吸収体から表面シートへの液戻り量が低減される。加えて吸収体の排泄対応領域が過吸収状態であっても、まだ吸収に余裕のある他の吸収部位に、前記内部空間18により適切に液が拡散する。したがっておむつ100は、表面シートの肌当接面側に液残りや液戻りを抑制し液透過性に優れ、吸収性能の安定性の高いものとなる。
The diaper 100 of this embodiment is shown as a tape type, and a fastening tape 86 is provided on the flap portion on the back side r. The diaper can be mounted and fixed by applying the tape 86 to a tape applying part (not shown) provided on the flap part on the ventral side f. At this time, the center part c of the diaper is gently bent inward, and the absorbent body 83 is worn so as to run along the baby's buttocks and lower abdomen. As a result, excreta is absorbed and held in the absorber 83 accurately. By using it in such a form, especially the sheet | seat 10 is applied as a surface sheet, and the favorable touch, cushioning property, and excretion collection property are shown. In particular, in the diaper 100, the excrement collecting ability can achieve extremely high performance that cannot be achieved with a conventional surface sheet of linear protrusions or with a small hole, for example, the skin of an infant. It can be suitably protected from rough skin caused by diarrhea or soft stool.
Furthermore, the diaper 100 can suppress liquid return from the internal space to the skin surface side by holding the internal space due to the cushioning property of the seat 10, the spring property of the constricted portion 7, and the like. Further, the constricted portion 7 acts to push the liquid toward the absorber, and the absorption speed from the top sheet to the absorber can be maintained fast. In addition, since the sheet 10 moderately disperses the pressure applied to the lower-layer absorber and has a large shape restoring force, the amount of liquid return from the absorber to the top sheet is reduced. In addition, even if the excretion-corresponding region of the absorbent body is in an overabsorbed state, the liquid is appropriately diffused by the internal space 18 to other absorption sites that still have room for absorption. Therefore, the diaper 100 is excellent in liquid permeability and high stability in absorption performance by suppressing liquid remaining and liquid return on the skin contact surface side of the top sheet.
 本発明のシートは、クッション性及び変形性に優れ、通気性が良好なものとなる。また本発明の吸収性物品は、前記シートを用いて排泄物の捕集性に優れたものとなる。 The sheet of the present invention is excellent in cushioning properties and deformability, and has good air permeability. Moreover, the absorbent article of this invention becomes the thing excellent in the collection property of excrement using the said sheet | seat.
 本発明のシートは、その他、各種用途に用いることができる。例えば、上述した使い捨ておむつや、生理用ナプキン、パンティーライナー、尿取りパッド等の吸収性物品の表面シートとして好適に使用することができる。なかでも、シートの両面が網状構造であることに起因する通気性や液拡散性、押圧力時の変形特性、などに優れていることから、おむつや生理用品等の表面シートと吸収体との間に介在させるサブレイヤーとして用いることもできる。その他、表面シート、ギャザー、外装シート、ウイングとして利用する形態も挙げられる。その他、おしり拭きシート、清掃シート、フィルターとして利用する形態も挙げられる。 The sheet of the present invention can be used for various other purposes. For example, it can be suitably used as a surface sheet for absorbent articles such as the disposable diapers described above, sanitary napkins, panty liners, urine absorption pads and the like. Above all, because it is excellent in air permeability and liquid diffusibility due to the network structure on both sides of the sheet, deformation characteristics under pressure, etc., the surface sheet such as diapers and sanitary products and absorbents It can also be used as a sublayer interposed therebetween. In addition, the form utilized as a surface sheet, a gather, an exterior sheet, and a wing is also mentioned. In addition, the form used as a wiping wipe sheet, a cleaning sheet, and a filter is also mentioned.
 上述した実施形態に関し、本発明はさらに以下のシート及び吸収性物品を開示する。
<1>シートを平面視した側の第1面側に突出し、かつ、内部空間を有する第1突出部と、前記第1面側とは反対側の第2面側に突出し、かつ、内部空間を有する第2突出部とを有し、前記第1突出部及び第2突出部は、該シートの平面視交差する異なる方向のそれぞれに交互に壁部を介し連続してシート平面方向に広がって配され、前記第1突出部の内部空間は第2面側に開放され、前記第2突出部の内部空間は第1面側に開放されており、前記第1突出部の頂部から第2突出部の頂部へと繋がる前記壁部には、前記第2突出部の内部空間へ向けて括れた部分を有するシート。
This invention discloses the following sheets and absorbent articles further regarding embodiment mentioned above.
<1> A first projecting portion projecting to the first surface side of the sheet in plan view and having an internal space, and a second surface side opposite to the first surface side, and the internal space The first protrusion and the second protrusion are alternately spread in the plane direction of the sheet through the wall alternately in each of the different directions intersecting in plan view of the sheet. The internal space of the first protrusion is open to the second surface side, the internal space of the second protrusion is open to the first surface side, and the second protrusion protrudes from the top of the first protrusion. A sheet having a portion constricted toward the internal space of the second protrusion on the wall connected to the top of the part.
<2>前記第1突出部及び第2突出部が保持する前記内部空間は、該第1突出部及び第2突出部それぞれの外径と相似する頂部に丸みのある円錐台形状もしくは半球状である前記<1>に記載のシート。
<3>前記括れ部は、少なくとも2箇所に対をなして形成されている前記<1>又は<2>に記載のシート。
<4>前記第2突出部の厚み方向断面において、前記第2突出部の幅に対して、前記括れ部が幅狭とされている前記<1>~<3>のいずれか1に記載のシート。
<5>前記第2突出部の厚み方向断面において、幅Bを一対の前記括れ部が最も接近した位置でのその内壁の距離とし、幅Aを該括れ付近及びその下方で壁部同士の幅が最も広い部分の内壁間の距離としたときに、幅Bの幅Aに対する比率B/Aは、0.2~0.9である前記<1>~<4>のいずれか1に記載のシート。
<6>前記括れ部は、前記第2突出部の頂部の曲率が変化する、領域p’と領域p’との境界に配される前記<1>~<5>のいずれか1に記載のシート。
<7>前記シートの厚みTに対する、前記括れ部の前記第2突出部の頂部からの高さTの比率T/Tが、0.1~0.9である前記<1>~<6>のいずれか1に記載のシート。
<8>前記括れ部は、少なくとも2箇所に対をなして形成され、所定の幅に筋状に形成されている前記<1>~<7>のいずれか1に記載のシート。
<9>前記括れ部が配される高さ位置の前記第2突出部の外周の半円周長さをCとし、前記括れ部の括れ筋の周長さをDとしたとき、これらの比率D/Cが、0.2~0.9である前記<1>~<8>のいずれか1に記載のシート。
<10>前記括れ部が前記第2突出部の全周に存在する前記<1>~<9>のいずれか1に記載のシート。
<11>前記括れ部は、角の少ない丸みのある形状である前記<1>~<10>のいずれか1に記載のシート。
<12>シート厚み方向への加圧によって、前記括れ部分のシート材が折り重なって積層厚み部となる前記<1>~<11>のいずれか1に記載のシート。
<13>前記シートの圧縮硬さLCが、0.01~0.35である前記<1>~<12>のいずれか1に記載のシート。
<14>非変形性の押圧面により50gf/cmの圧力で前記シートを面方向に押圧したときに、該押圧面及び前記シートの接触面積S50と前記押圧面の単位総面積Saとの比率S50/Saが0.3~0.9である前記<1>~<13>のいずれか1に記載のシート。
<15>0.5gf/cmの圧力で前記シートの厚み方向に面状に加圧したときのシート厚みT0.5と、50gf/cmの圧力で前記シートの厚み方向に面状に加圧したときのシート厚みT50との比T0.5/T50が2.5~10.0である前記<1>~<14>のいずれか1に記載のシート。
<16>前記括れ部は、前記第2突出部の壁部において応力が集中し易いところに形成されている前記<1>~<15>のいずれか1に記載のシート。
<17>前記括れ部分が、製造時における機械方向と直交する方向に存在する前記<1>~<16>のいずれか1に記載のシート。
<18>前記第2突出部の内部空間はその平面視において長軸及び短軸を有する環形状であり、前記短軸方向に前記括れ部分が配されている前記<1>~<17>のいずれか1に記載のシート。
<19>前記シートが不織布からなる前記<1>~<18>のいずれか1に記載のシート。
<20>前記壁部は、前記シートの平面方向のいずれの箇所においても、前記第1突出部と第2突出部とを結ぶ方向に沿った繊維配向性を有する前記<19>に記載のシート。
<21>前記<1>~<20>のいずれか1に記載のシートを、前記第2面側を非肌当接面側に向けて、表面材として適用した吸収性物品。
<22>前記<1>~<20>のいずれか1に記載のシートを、前記第2面側を非肌当接面側に向けて、表面材として適用した使い捨ておむつ。
<23>多数の突起を有し通気性を有する台座上に熱可塑性繊維を含有する繊維ウエブを搬送し、該繊維ウエブの上から前記台座へ向かって熱風を吹き付けてウエブに凹凸形状を賦形する不織布の製造方法であって、
 前記熱風を吹き付けて、前記台座上の突起に沿って前記繊維ウエブを賦形する工程と、
 次いで前記熱風温度よりも高温に切り替えて各繊維を融着させる工程とを備え、
さらに、ニップロールによる押圧加工を施す工程を有する不織布の製造方法。
<24>前記ニップロールを線圧20~50kg/cmの条件で押圧する前記<23>記載の不織布の製造方法。
<2> The internal space held by the first protrusion and the second protrusion is in the shape of a truncated cone or hemisphere having a round top at the top similar to the outer diameter of each of the first protrusion and the second protrusion. The sheet according to <1>.
<3> The sheet according to <1> or <2>, wherein the constricted portion is formed in pairs at least at two places.
<4> In any one of the above items <1> to <3>, in the cross section in the thickness direction of the second protrusion, the constricted portion is narrower than the width of the second protrusion. Sheet.
<5> In the cross section in the thickness direction of the second projecting portion, the width B is the distance between the inner walls at a position where the pair of constricted portions are closest to each other, and the width A is the width between the wall portions near and below the constricted portions. Is the distance between the inner walls of the widest portion, the ratio B / A of the width B to the width A is 0.2 to 0.9, according to any one of the above items <1> to <4> Sheet.
<6> The constricted portion may be any one of the above items <1> to <5>, which is disposed at a boundary between the region p ′ 2 and the region p ′ 3 where the curvature of the top portion of the second projecting portion changes. The described sheet.
<7> A ratio T 7 / T of a height T 7 from the top of the second protruding portion of the constricted portion to a thickness T of the sheet is 0.1 to 0.9. The sheet according to any one of 6>.
<8> The sheet according to any one of <1> to <7>, wherein the constricted portions are formed in pairs at least at two locations and are formed in a streak shape with a predetermined width.
<9> When the semicircular circumferential length of the outer periphery of the second projecting portion at the height position where the constricted portion is arranged is C and the circumferential length of the constricted muscle of the constricted portion is D, these ratios The sheet according to any one of <1> to <8>, wherein D / C is 0.2 to 0.9.
<10> The sheet according to any one of <1> to <9>, wherein the constricted portion is present around the entire circumference of the second projecting portion.
<11> The sheet according to any one of <1> to <10>, wherein the constricted portion has a rounded shape with few corners.
<12> The sheet according to any one of <1> to <11>, wherein the constricted portion of the sheet material is folded to form a laminated thickness portion by pressing in the sheet thickness direction.
<13> The sheet according to any one of <1> to <12>, wherein the compression hardness LC of the sheet is 0.01 to 0.35.
<14> When the sheet is pressed in the surface direction with a pressure of 50 gf / cm 2 by a non-deformable pressing surface, the contact area S 50 of the pressing surface and the sheet and the unit total area Sa of the pressing surface The sheet according to any one of <1> to <13>, wherein the ratio S 50 / Sa is 0.3 to 0.9.
<15> the sheet thickness T 0.5 when pressurized to surface in the thickness direction of the sheet at a pressure of 0.5 gf / cm 2, the thickness direction of the sheet at a pressure of 50 gf / cm 2 in surface The sheet according to any one of <1> to <14>, wherein a ratio T 0.5 / T 50 to the sheet thickness T 50 when pressed is 2.5 to 10.0.
<16> The sheet according to any one of <1> to <15>, wherein the constricted portion is formed in a place where stress is likely to concentrate on the wall portion of the second projecting portion.
<17> The sheet according to any one of <1> to <16>, wherein the constricted portion is present in a direction orthogonal to a machine direction at the time of manufacture.
<18> The internal space of the second projecting portion has an annular shape having a major axis and a minor axis in plan view, and the constricted portion is disposed in the minor axis direction. The sheet according to any one of the above.
<19> The sheet according to any one of <1> to <18>, wherein the sheet is a nonwoven fabric.
<20> The sheet according to <19>, wherein the wall portion has a fiber orientation along a direction connecting the first projecting portion and the second projecting portion at any location in the planar direction of the sheet. .
<21> An absorbent article in which the sheet according to any one of <1> to <20> is applied as a surface material with the second surface side facing the non-skin contact surface side.
<22> A disposable diaper in which the sheet according to any one of <1> to <20> is applied as a surface material with the second surface side facing the non-skin contact surface side.
<23> A fiber web containing thermoplastic fibers is transported onto a pedestal having a large number of protrusions and air permeability, and hot air is blown from the top of the fiber web toward the pedestal to form an uneven shape on the web. A method for producing a nonwoven fabric comprising:
Blowing the hot air to shape the fiber web along the protrusions on the pedestal;
Then, the step of switching to a temperature higher than the hot air temperature and fusing each fiber,
Furthermore, the manufacturing method of the nonwoven fabric which has the process of giving the press process by a nip roll.
<24> The method for producing a nonwoven fabric according to <23>, wherein the nip roll is pressed under a condition of a linear pressure of 20 to 50 kg / cm.
 以下、実施例に基づき本発明を更に詳細に説明するが、本発明はこれらの実施例により限定して解釈されるものではない。 Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not construed as being limited by these examples.
(実施例1)
 芯がポリエチレンテレフタレートで鞘がポリエチレンからなる2.2dtex×51mmの芯鞘型複合繊維を坪量30g/mとなるようカード機からウェブ賦形装置に供給した。ウェブ賦形装置では、常温の空気を供給して、多数の突起を有し通気性を有する台座の上に上記繊維ウェブを定着させた。この台座の突起のピッチ(突起の平面視における中心間の距離)を、MD方向8mm、CD方向5mm、突出高さを3mmとした。次いで、その台座上の繊維ウェブに熱風(温度130℃、風速50m/s)を吹きつけて賦形し、前記台座上の突起にそって繊維ウェブを賦形するとともに、熱風を温度160℃、風速5m/sの条件に切り替えて各芯鞘構造の繊維を融着させた。このときのライン速度は100m/minとした。次に、線圧35kg/cmに調整したニップロール間を通した。このようにして、熱融着して賦形し、プレスした不織布を取り出し、括れ部を有するシート試験体1とした。
Example 1
A 2.2-dtex × 51 mm core-sheath composite fiber having a core of polyethylene terephthalate and a sheath of polyethylene was supplied from the card machine to the web shaping device so as to have a basis weight of 30 g / m 2 . In the web shaping device, normal temperature air was supplied to fix the fibrous web on a pedestal having a large number of protrusions and air permeability. The pitch of the protrusions on this pedestal (the distance between the centers in the plan view of the protrusions) was 8 mm in the MD direction, 5 mm in the CD direction, and the protrusion height was 3 mm. Next, hot air (temperature 130 ° C., wind speed 50 m / s) is blown onto the fiber web on the pedestal, and the fiber web is shaped along the protrusions on the pedestal. The core-sheath structure fibers were fused by switching to a wind speed of 5 m / s. The line speed at this time was 100 m / min. Next, it passed between nip rolls adjusted to a linear pressure of 35 kg / cm. In this way, the non-woven fabric that was heat-sealed and shaped and pressed was taken out, and a sheet test body 1 having a constricted portion was obtained.
(実施例2)
 上記実施例1における台座の突起の突出高さを5mmとした以外同様にしてシート試験体2を得た。
(Example 2)
A sheet test body 2 was obtained in the same manner except that the protrusion height of the protrusion on the base in Example 1 was set to 5 mm.
(比較例1)
 特開2008-25081号公報の実施例1と同様にして、蛇腹状の形態を有する不織布を作製した。具体的には以下のとおりである。
 第1繊維層として、低密度ポリエチレン(融点110℃)とポリエチレンテレフタレートの芯鞘構造で、平均繊度3.3dtex、平均繊維長51mm、親水油剤がコーティングされた繊維A、および高密度ポリエチレン(融点135℃)とポリエチレンテレフタレートの芯鞘構造で、平均繊度3.3dtex、平均繊維長51mm、撥水油剤がコーティングされた繊維Bとが混合された繊維層を使用した。繊維Aと繊維Bは70:30の混合比で含有され、坪量は15g/mに調整した。
 第2繊維層として、高密度ポリエチレンとポリエチレンテレフタレートの芯鞘構造で、平均繊度4.4dtex、平均繊維長38mm、親水油剤がコーティングされた繊維100%の繊維層を使用した。この繊維層における坪量は25g/mであった。
 特開2008-25081号公報の図8、図9に示されたものと同様の装置を用い、前記のようにして積層した繊維を搬送しながら、これに前記装置の吹き出し部から温度105℃、風量1200l/minの条件で熱風を吹き当てのようにして、蛇腹状上の形態を有するシート試験体c1を得た。
(Comparative Example 1)
A nonwoven fabric having a bellows-like shape was produced in the same manner as in Example 1 of JP-A-2008-25081. Specifically, it is as follows.
As the first fiber layer, low-density polyethylene (melting point 110 ° C.) and polyethylene terephthalate core-sheath structure, average fineness 3.3 dtex, average fiber length 51 mm, fiber A coated with a hydrophilic oil agent, and high-density polyethylene (melting point 135 ° C) and a core-sheath structure of polyethylene terephthalate, and a fiber layer in which an average fineness of 3.3 dtex, an average fiber length of 51 mm, and a fiber B coated with a water-repellent oil agent was used. Fiber A and Fiber B were contained at a mixing ratio of 70:30, and the basis weight was adjusted to 15 g / m 2 .
As the second fiber layer, a fiber layer having a core-sheath structure of high-density polyethylene and polyethylene terephthalate, an average fineness of 4.4 dtex, an average fiber length of 38 mm, and a fiber coated with a hydrophilic oil agent was used. The basis weight in this fiber layer was 25 g / m 2 .
The apparatus similar to that shown in FIG. 8 and FIG. 9 of Japanese Patent Application Laid-Open No. 2008-25081 is used, while conveying the laminated fibers as described above, a temperature of 105 ° C. from the blowing part of the apparatus, A sheet test body c1 having a bellows-like shape was obtained by blowing hot air under conditions of an air volume of 1200 l / min.
(比較例2)
 特開2001-20168号公報の実施例1と同様にして、エンボスにより凹凸を有する不織布を作製した。具体的には以下のとおりである。
 ポリプロピレン樹脂からなる、坪量40g/mのスパンボンド不織布を、両面から2つの凸ロールを用いて130℃でスチールマッチエンボス加工することにより、規則的に配列された多数の凸部〔凸部の数;5個/cm(圧縮回復性シートの面積基準)、各凸部間の距離;4.5mm、凸部における表面と裏面との間の厚み;0.5mm〕が形成されている繊維集合体からなる圧縮回復性シート(シート試験体c2)を得た。
(Comparative Example 2)
In the same manner as in Example 1 of Japanese Patent Application Laid-Open No. 2001-20168, a nonwoven fabric having irregularities was produced by embossing. Specifically, it is as follows.
By forming a spunbonded nonwoven fabric made of polypropylene resin with a basis weight of 40 g / m 2 at 130 ° C. using two convex rolls on both sides at 130 ° C., a large number of regularly arranged convex portions [convex portions 5 / cm 2 (area standard of compression recoverable sheet), distance between each convex part; 4.5 mm, thickness between the front surface and the back surface of the convex part; 0.5 mm] is formed A compression recoverable sheet (sheet test body c2) comprising a fiber assembly was obtained.
(比較例3)
 特開2004-174234号公報の実施例1と同様にして、凹凸を有する2層構造の不織布を作製した。具体的には以下のとおりである。
 第1および第2のシートを構成する不織布として、芯がポリエチレンテレフタレートで鞘がポリエチレンからなる2.2dtexの芯鞘型複合繊維を構成繊維とする坪量18g/mのエアースルー不織布をそれぞれ準備した。これらのシートを用い、特開2004-174234に示す装置を用いて使い捨ておむつの吸収性物品用シート(シート試験体c3)を作製した。得られたシートにおける凸部の高さhは1.4mm、X方向に沿う凸部の幅wは4.0mm、接合部(凹部)の幅kは1.0mmであった。
(Comparative Example 3)
A nonwoven fabric having a two-layer structure having irregularities was produced in the same manner as in Example 1 of JP-A No. 2004-174234. Specifically, it is as follows.
As nonwoven fabrics constituting the first and second sheets, air through nonwoven fabrics each having a basis weight of 18 g / m 2 and comprising 2.2 dtex core-sheath type composite fibers having a core of polyethylene terephthalate and a sheath of polyethylene are prepared. did. Using these sheets, an absorbent article sheet (sheet specimen c3) for disposable diapers was produced using an apparatus disclosed in JP-A No. 2004-174234. The height h of the convex part in the obtained sheet was 1.4 mm, the width w of the convex part along the X direction was 4.0 mm, and the width k of the joint part (concave part) was 1.0 mm.
 上記の不織布試験体を用い下記の測定試験を行った。その結果を下記の表1に示す。 The following measurement test was performed using the above-mentioned nonwoven fabric test specimen. The results are shown in Table 1 below.
<50gf/cm加圧時空間>
 10cm角のアクリル板を準備した。このとき、荷重が50gf/cmとなるよう、アクリル板上に載せる錘を調整した。平らな机上にシートを置き、その上にアクリル板と錘を載せ、机上およびアクリル板とシートとの間に空間が存在するかしないかを観察した。
<50gf / cm 2 pressurization space>
A 10 cm square acrylic plate was prepared. At this time, the weight placed on the acrylic plate was adjusted so that the load was 50 gf / cm 2 . A sheet was placed on a flat desk, an acrylic plate and a weight were placed thereon, and it was observed whether or not there was a space on the desk and between the acrylic plate and the sheet.
<厚み>
 不織布の厚みは、風合い計測システムKES-FB3-AUTO-Aを使用して測定した。測定時の設定は、感度2,圧縮速さ50秒/mm、データ取込感覚0.1秒、加圧面積2cm(付属治具)とし、また測定するシートの大きさは15cm×15cmとし、測定台の中央に配置した。測定器の基準設定に従い3カ所の測定を行った。荷重0.5g/cm時の厚みをT0.5、荷重50g/cm時の厚みをT50とし、それぞれ3カ所の平均値を測定値とした。
<Thickness>
The thickness of the nonwoven fabric was measured using a texture measurement system KES-FB3-AUTO-A. The measurement settings are: sensitivity 2, compression speed 50 seconds / mm, data capture sensation 0.1 seconds, pressurization area 2 cm 2 (attached jig), and the size of the sheet to be measured is 15 cm × 15 cm And placed in the center of the measuring table. Three measurements were taken according to the standard settings of the measuring instrument. The thickness at a load of 0.5 g / cm 2 was defined as T0.5, the thickness at a load of 50 g / cm 2 was defined as T50, and average values at three locations were measured values.
<圧縮硬さ(LC)>
 不織布の圧縮硬さ(LC)は、風合い計測システムKES-FB3-AUTO-Aを使用して測定した。測定時の設定は、感度2,圧縮速さ50秒/mm、データ取込感覚0.1秒、加圧面積2cm(付属治具)とし、また測定するシートの大きさは15cm×15cmとし、測定台の中央に配置した。測定器の基準設定に従い3カ所の測定を行い、その平均値を測定値とした。
<Compression hardness (LC)>
The compression hardness (LC) of the nonwoven fabric was measured using a texture measurement system KES-FB3-AUTO-A. The measurement settings are: sensitivity 2, compression speed 50 seconds / mm, data capture sensation 0.1 seconds, pressurization area 2 cm 2 (attached jig), and the size of the sheet to be measured is 15 cm × 15 cm And placed in the center of the measuring table. Measurements were made at three locations according to the standard settings of the measuring instrument, and the average value was taken as the measured value.
<クッション性>
 シートを上から評価者の手で押したり戻したりした時の感触を評価した。評価者は3人とし、その平均点(小数点第一位を四捨五入)をそのシートの評価結果とした。
 測定結果の評価を実用上の要求を考慮し以下のように区別した。
 3: 押した時および戻した時に、バネのような反発感を感じる。
 2: 押した時および戻した時に、バネのような反発感はあるが、弱い。もしくは、押した時または戻した時のどちらかのみ、バネのような反発感を感じる。
 1: 押した時および戻した時に、バネのような反発感を感じない。
<Cushioning>
The feel when the sheet was pushed or returned by the evaluator's hand from above was evaluated. There were three evaluators, and the average score (rounded to the first decimal place) was used as the evaluation result for the sheet.
The evaluation of the measurement results was distinguished as follows in consideration of practical requirements.
3: A feeling of resilience like a spring is felt when pushing and returning.
2: When pressed and returned, there is a feeling of resilience like a spring, but it is weak. Or, it feels a spring-like rebound only when it is pushed or returned.
1: There is no feeling of resilience like a spring when pushing and returning.
<易変形性>
 シートを折り曲げた時の感触を評価した。評価者は3人とし、その平均点(小数点第一位を四捨五入)をそのシートの評価結果とした。
 測定結果の評価を実用上の要求を考慮し以下のように区別した。
 3: 折り曲げた時に柔らかく感じる。また自然に折れ曲がる。
 2: 折り曲げた時に多少硬く感じる。もしくは、折り曲げた時に折れ曲がり線が発生する。
 1: 折り曲げた時に硬く感じる。もしくは、折り曲げた時に折れ曲がり線が発生する。
<Easily deformable>
The feel when the sheet was folded was evaluated. There were three evaluators, and the average score (rounded to the first decimal place) was used as the evaluation result for the sheet.
The evaluation of the measurement results was distinguished as follows in consideration of practical requirements.
3: Feels soft when folded. It also bends naturally.
2: Feels somewhat stiff when folded. Alternatively, a bent line is generated when it is bent.
1: Feels hard when folded. Alternatively, a bent line is generated when it is bent.
<吸収速度>
 280×160mmに切り出した不織布試験体を、サブレイヤー(芯がポリエチレンテレフタレートで鞘がポリエチレンからなる4.43.3dtexの芯鞘型複合繊維を構成繊維とする坪量1220g/mのウェブ、および芯がポリプロピレンで鞘がポリエチレンからなる7.8dtexの芯鞘型複合繊維を構成繊維とする坪量20g/mのウェブを重ね合わせて作製したエアースルー不織布)を介して、パルプ吸収体の上に設置した。上記不織布上に20g/cmの荷重を均等にかけ、試験体のほぼ中央に設置した内直径36mmの筒を当て、そこから生理食塩水を注入した。その後、10分ごとに40gずつ3回にわたり生理食塩水を注入し、3回目を注入した際の吸収しきる時間(秒)を測定した。各試料の測定結果を下表1に示した。
 測定結果の評価を実用上の要求を考慮し以下のように区別した。
 A: 吸収しきる時間が180秒以内。
 B: 吸収しきる時間が180秒~300秒。
 C: 吸収しきる時間が300秒以上。
<Absorption rate>
A non-woven fabric specimen cut out to 280 × 160 mm was formed into a sublayer (web having a basis weight of 1220 g / m 2 having a core-sheath composite fiber of 4.43.3 dtex whose core is made of polyethylene terephthalate and whose sheath is made of polyethylene, and On the pulp absorbent body through an air-through non-woven fabric produced by superimposing a web having a basis weight of 20 g / m 2 having a core-sheath composite fiber of 7.8 dtex having a core of polypropylene and a sheath of polyethylene. Installed. A load of 20 g / cm 2 was evenly applied on the nonwoven fabric, and a cylinder with an inner diameter of 36 mm placed at the approximate center of the test specimen was applied, and physiological saline was injected therefrom. Thereafter, physiological saline was injected three times at a rate of 40 g every 10 minutes, and the time (seconds) to be absorbed when the third injection was performed was measured. The measurement results of each sample are shown in Table 1 below.
The evaluation of the measurement results was distinguished as follows in consideration of practical requirements.
A: Absorption time is within 180 seconds.
B: Absorption time is 180 to 300 seconds.
C: Absorption time is 300 seconds or more.
<液戻り性>
 前記吸収速度評価において、3回目を注入した10分後に、注入部を中心として、その上にろ紙(ADVANTEC東洋製4A、大きさ100mm×100mm)20枚を乗せ、更にその上に3.5kPa(3.5kg、大きさ100mm×100mm)の重りを乗せる。重りを乗せてから2分後にろ紙を外す。ろ紙の初期重量と加圧後重量の差分を液戻り量として測定する。
 測定結果の評価を実用上の要求を考慮し以下のように区別した。
 A: 液戻り量が0.5g以下。
 B: 液戻り量が0.5~1g。
 C: 液戻り量が1g以上。
<Liquid returnability>
In the absorption rate evaluation, 10 minutes after the third injection, 20 filter papers (ADVANTEC Toyo 4A, size 100 mm × 100 mm) were placed on the injection part, and 3.5 kPa (3.5 kPa ( 3.5kg, size 100mm x 100mm). Remove the filter paper 2 minutes after placing the weight. The difference between the initial weight of the filter paper and the weight after pressurization is measured as the liquid return amount.
The evaluation of the measurement results was distinguished as follows in consideration of practical requirements.
A: The liquid return amount is 0.5 g or less.
B: Liquid return amount is 0.5 to 1 g.
C: Liquid return amount is 1 g or more.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
 上記の結果より、本発明の好ましい実施形態に係る不織布(実施例)は、比較例のものに比して、通気性が良好であり、クッション性及び変形性がともに高く、吸収速度が速くべた付かない肌に優しい特性において優れることが分かる。 From the above results, the non-woven fabrics (Examples) according to preferred embodiments of the present invention have better air permeability, higher cushioning and deformability, and faster absorption speed than the comparative examples. It can be seen that it is excellent in skin-friendly properties that do not stick.
 本発明をその実施態様とともに説明したが、我々は特に指定しない限り我々の発明を説明のどの細部においても限定しようとするものではなく、添付の請求の範囲に示した発明の精神と範囲に反することなく幅広く解釈されるべきであると考える。 While this invention has been described in conjunction with its embodiments, we do not intend to limit our invention in any detail of the description unless otherwise specified and are contrary to the spirit and scope of the invention as set forth in the appended claims. I think it should be interpreted widely.
 本願は、2011年12月8日に日本国で特許出願された特願2011-269380に基づく優先権を主張するものであり、これらはここに参照してその内容を本明細書の記載の一部として取り込む。 This application claims priority based on Japanese Patent Application No. 2011-269380 filed in Japan on December 8, 2011, which is hereby incorporated herein by reference. Capture as part.
 1 第1突出部
 11 第1突出部頂部
 18 第1突出部 内部空間
 2 第2突出部
 21 第2突出部頂部
 28 第2突出部 内部空間
 3 壁部
 7 括れ部
 10 シート
DESCRIPTION OF SYMBOLS 1 1st protrusion part 11 1st protrusion part top part 18 1st protrusion part Internal space 2 2nd protrusion part 21 2nd protrusion part top part 28 2nd protrusion part Internal space 3 Wall part 7 Constriction part 10 Sheet

Claims (24)

  1.  シートを平面視した側の第1面側に突出し、かつ、内部空間を有する第1突出部と、前記第1面側とは反対側の第2面側に突出し、かつ、内部空間を有する第2突出部とを有し、前記第1突出部及び第2突出部は、該シートの平面視交差する異なる方向のそれぞれに交互に壁部を介し連続してシート平面方向に広がって配され、
     前記第1突出部の内部空間は第2面側に開放され、前記第2突出部の内部空間は第1面側に開放されており、
     前記第1突出部の頂部から第2突出部の頂部へと繋がる前記壁部には、前記第2突出部の内部空間へ向けて括れた部分を有するシート。
    A first projecting portion projecting on the first surface side of the sheet in plan view and having an internal space, and a second projecting surface projecting on the second surface side opposite to the first surface side and having an internal space. Two projecting portions, and the first projecting portion and the second projecting portion are arranged to spread continuously in the sheet plane direction alternately through the wall portions in different directions intersecting in plan view of the sheet,
    The internal space of the first protrusion is open to the second surface side, the internal space of the second protrusion is open to the first surface side,
    The sheet | seat which has a part constricted toward the internal space of the said 2nd protrusion part in the said wall part connected from the top part of a said 1st protrusion part to the top part of a 2nd protrusion part.
  2.  前記第1突出部及び第2突出部が保持する前記内部空間は、該第1突出部及び第2突出部それぞれの外径と相似する頂部に丸みのある円錐台形状もしくは半球状である請求項1記載のシート。 The internal space held by the first protrusion and the second protrusion has a truncated cone shape or a hemispherical shape with rounded tops similar to the outer diameters of the first protrusion and the second protrusion, respectively. The sheet according to 1.
  3.  前記括れ部は、少なくとも2箇所に対をなして形成されている請求項1又は2記載のシート。 The sheet according to claim 1 or 2, wherein the constricted portions are formed in pairs at least at two places.
  4.  前記第2突出部の厚み方向断面において、前記第2突出部の幅に対して、前記括れ部が幅狭とされている請求項1~3のいずれか1項に記載のシート。 The sheet according to any one of claims 1 to 3, wherein the constricted portion is narrower than a width of the second projecting portion in a cross section in the thickness direction of the second projecting portion.
  5.  前記第2突出部の厚み方向断面において、幅Bを一対の前記括れ部が最も接近した位置でのその内壁の距離とし、幅Aを該括れ付近及びその下方で壁部同士の幅が最も広い部分の内壁間の距離としたときに、幅Bの幅Aに対する比率B/Aは、0.2~0.9である請求項1~4のいずれか1項に記載のシート。 In the cross section in the thickness direction of the second projecting portion, the width B is the distance between the inner walls at the position where the pair of constricted portions are closest to each other, and the width A is the widest portion between the constricted portions and the lower portion. The sheet according to any one of claims 1 to 4, wherein a ratio B / A of the width B to the width A is 0.2 to 0.9 when the distance between the inner walls of the portions is used.
  6.  前記括れ部は、前記第2突出部の頂部の曲率が変化する、領域p’と領域p’との境界に配される請求項1~5のいずれか1項に記載のシート。 The constricted portion, the curvature of the top portion of the second projecting portion is changed, the sheet according to any one of claims 1 to 5 arranged on the boundary between the region p '2 and region p' 3.
  7.  前記シートの厚みTに対する、前記括れ部の前記第2突出部の頂部からの高さTの比率T/Tが、0.1~0.9である請求項1~6のいずれか1項に記載のシート。 The ratio T 7 / T of the height T 7 of the constricted portion from the top of the second protrusion to the thickness T of the sheet is 0.1 to 0.9. The sheet according to item.
  8.  前記括れ部は、少なくとも2箇所に対をなして形成され、所定の幅に筋状に形成されている請求項1~7のいずれか1項に記載のシート。 The sheet according to any one of claims 1 to 7, wherein the constricted portions are formed in pairs at least at two locations, and are formed in a streak shape with a predetermined width.
  9.  前記括れ部が配される高さ位置の前記第2突出部の外周の半円周長さをCとし、前記括れ部の括れ筋の周長さをDとしたとき、これらの比率D/Cが、0.2~0.9である請求項1~8のいずれか1項に記載のシート。 When the semicircular length of the outer periphery of the second projecting portion at the height position where the constricted portion is disposed is C and the peripheral length of the constricted muscle of the constricted portion is D, these ratios D / C The sheet according to any one of claims 1 to 8, wherein is from 0.2 to 0.9.
  10.  前記括れ部が前記第2突出部の全周に存在する請求項1~9のいずれか1項に記載のシート。 The sheet according to any one of claims 1 to 9, wherein the constricted portion is present all around the second projecting portion.
  11.  前記括れ部は、角の少ない丸みのある形状である請求項1~10のいずれか1項に記載のシート。 The sheet according to any one of claims 1 to 10, wherein the constricted portion has a rounded shape with few corners.
  12.  シート厚み方向への加圧によって、前記括れ部分のシート材が折り重なって積層厚み部となる請求項1~11のいずれか1項に記載のシート。 The sheet according to any one of claims 1 to 11, wherein the sheet material of the constricted portion is folded and becomes a laminated thickness portion by pressing in the sheet thickness direction.
  13.  前記シートの圧縮硬さLCが、0.01~0.35である請求項1~12のいずれか1項に記載のシート。 The sheet according to any one of claims 1 to 12, wherein the compression hardness LC of the sheet is 0.01 to 0.35.
  14.  非変形性の押圧面により50gf/cmの圧力で前記シートを面方向に押圧したときに、該押圧面及び前記シートの接触面積S50と前記押圧面の単位総面積Saとの比率S50/Saが0.3~0.9である請求項1~13のいずれか1項に記載のシート。 When the sheet is pressed in the surface direction with a pressure of 50 gf / cm 2 by a non-deformable pressing surface, the ratio S 50 between the pressing surface and the contact area S 50 of the sheet and the unit total area Sa of the pressing surface. The sheet according to any one of claims 1 to 13, wherein / Sa is 0.3 to 0.9.
  15.  0.5gf/cmの圧力で前記シートの厚み方向に面状に加圧したときのシート厚みT0.5と、50gf/cmの圧力で前記シートの厚み方向に面状に加圧したときのシート厚みT50との比T0.5/T50が2.5~10.0である請求項1~14のいずれか1項に記載のシート。 A sheet thickness T 0.5 at which a pressure of 0.5 gf / cm 2 pressurized to surface in the thickness direction of the sheet was pressurized in the thickness direction of the sheet at a pressure of 50 gf / cm 2 in surface The sheet according to any one of claims 1 to 14, wherein a ratio T 0.5 / T 50 with respect to the sheet thickness T 50 is 2.5 to 10.0.
  16.  前記括れ部は、前記第2突出部の壁部において応力が集中し易いところに形成されている請求項1~15のいずれか1項に記載のシート。 The sheet according to any one of claims 1 to 15, wherein the constricted portion is formed in a place where stress is likely to concentrate in the wall portion of the second projecting portion.
  17.  前記括れ部分が、製造時における機械方向と直交する方向に存在する請求項1~16のいずれか1項に記載のシート。 The sheet according to any one of claims 1 to 16, wherein the constricted portion is present in a direction orthogonal to a machine direction at the time of manufacture.
  18.  前記第2突出部の内部空間はその平面視において長軸及び短軸を有する環形状であり、前記短軸方向に前記括れ部分が配されている請求項1~17のいずれか1項に記載のシート。 The internal space of the second projecting portion has an annular shape having a major axis and a minor axis in plan view, and the constricted portion is arranged in the minor axis direction. Sheet.
  19.  前記シートが不織布からなる請求項1~18のいずれか1項に記載のシート。 The sheet according to any one of claims 1 to 18, wherein the sheet is made of a nonwoven fabric.
  20.  前記壁部は、前記シートの平面方向のいずれの箇所においても、前記第1突出部と第2突出部とを結ぶ方向に沿った繊維配向性を有する請求項19記載のシート。 The sheet according to claim 19, wherein the wall portion has a fiber orientation along a direction connecting the first projecting portion and the second projecting portion at any location in the planar direction of the sheet.
  21.  請求項1~20のいずれか1項に記載のシートを、前記第2面側を非肌当接面側に向けて、表面材として適用した吸収性物品。 21. An absorbent article in which the sheet according to claim 1 is applied as a surface material with the second surface side facing the non-skin contact surface side.
  22.  請求項1~20のいずれか1項に記載のシートを、前記第2面側を非肌当接面側に向けて、表面材として適用した使い捨ておむつ。 A disposable diaper in which the sheet according to any one of claims 1 to 20 is applied as a surface material with the second surface side facing the non-skin contact surface side.
  23.  多数の突起を有し通気性を有する台座上に熱可塑性繊維を含有する繊維ウエブを搬送し、該繊維ウエブの上から前記台座へ向かって熱風を吹き付けてウエブに凹凸形状を賦形する不織布の製造方法であって、
     前記熱風を吹き付けて、前記台座上の突起に沿って前記繊維ウエブを賦形する工程と、
     次いで前記熱風温度よりも高温に切り替えて各繊維を融着させる工程とを備え、
     さらに、ニップロールによる押圧加工を施す工程を有する不織布の製造方法。
    A nonwoven fabric which conveys a fiber web containing thermoplastic fibers onto a pedestal having a large number of protrusions and has air permeability, and blows hot air from above the fiber web toward the pedestal to shape the uneven shape on the web. A manufacturing method comprising:
    Blowing the hot air to shape the fiber web along the protrusions on the pedestal;
    Then, the step of switching to a temperature higher than the hot air temperature and fusing each fiber,
    Furthermore, the manufacturing method of the nonwoven fabric which has the process of giving the press process by a nip roll.
  24.  前記ニップロールを線圧20~50kg/cmの条件で押圧する請求項23記載の不織布の製造方法。 The method for producing a nonwoven fabric according to claim 23, wherein the nip roll is pressed under a condition of a linear pressure of 20 to 50 kg / cm.
PCT/JP2012/080621 2011-12-08 2012-11-27 Sheet and absorbent article using same WO2013084752A1 (en)

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JP2011269380A JP6140388B2 (en) 2011-12-08 2011-12-08 Sheet and absorbent article using the same
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JP5885783B2 (en) * 2014-06-26 2016-03-15 ユニ・チャーム株式会社 Non-woven
JP5683742B1 (en) * 2014-06-30 2015-03-11 ユニ・チャーム株式会社 Absorbent article and wearing article comprising the absorbent article
JP6467242B2 (en) * 2015-02-18 2019-02-06 花王株式会社 Absorbent articles
EP3426213B1 (en) * 2016-03-11 2020-11-11 The Procter and Gamble Company Nonwoven material having discrete three-dimensional deformations with improved protrusion dimensions after compression
BR112019015923B1 (en) 2017-01-31 2023-12-26 The Procter & Gamble Company FORMATTED NON-WOVEN, ABSORBENT ARTICLE AND ABSORBENT ARTICLE PACKAGING
CN110198693A (en) 2017-01-31 2019-09-03 宝洁公司 Form non-woven cloth
WO2020148818A1 (en) 2019-01-16 2020-07-23 花王株式会社 Nonwoven fabric for absorbent article

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