WO2019044217A1 - Textile non-tissé - Google Patents

Textile non-tissé Download PDF

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Publication number
WO2019044217A1
WO2019044217A1 PCT/JP2018/026728 JP2018026728W WO2019044217A1 WO 2019044217 A1 WO2019044217 A1 WO 2019044217A1 JP 2018026728 W JP2018026728 W JP 2018026728W WO 2019044217 A1 WO2019044217 A1 WO 2019044217A1
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WO
WIPO (PCT)
Prior art keywords
nonwoven fabric
surface side
woven fabric
fiber layer
fabric according
Prior art date
Application number
PCT/JP2018/026728
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English (en)
Japanese (ja)
Inventor
吉彦 瀬戸
由彦 衣笠
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 RU2020111916A priority Critical patent/RU2736266C1/ru
Priority to CN201880054643.0A priority patent/CN111032942B/zh
Publication of WO2019044217A1 publication Critical patent/WO2019044217A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/74—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being orientated, e.g. in parallel (anisotropic fleeces)
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/76—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres otherwise than in a plane, e.g. in a tubular way

Definitions

  • the present invention relates to non-woven fabrics.
  • Nonwoven fabrics are often used for absorbent articles such as sanitary napkins and diapers. There are known techniques for imparting various functions to this non-woven fabric.
  • Patent Document 1 describes a nonwoven fabric in which both surfaces are made uneven. The unevenness on the both sides is formed by alternately arranging first and second protrusions which project in opposite directions, in different directions crossing in plan view via the annular wall. The first protrusion and the second protrusion have an internal space that opens on the opposite surface side, and the internal spaces are separated by the ridge portion and are not continuous.
  • Patent Document 2 describes a non-woven fabric in which a first layer and a second layer are laminated, and the bonded portions and non-bonded portions of both layers are alternately arranged.
  • the non-woven fabric has a convex portion in which the first layer protrudes in the non-joining portion to make the inside hollow, and a concave portion in a joint portion between the convex portions.
  • the convex portions and the concave portions are arranged alternately and in a row in one direction, and the rows are arranged in multiple rows. In this arrangement, the hollow portions of the convex portions are not connected but have a closed structure.
  • JP 2012-136792 A JP, 2006-341455, A
  • the present invention is a non-woven fabric having thermoplastic fibers and having a first surface and a second surface opposite to the first surface, wherein the outer surface fiber layer on the first surface, The outer surface fiber layer on the second surface side, a plurality of connecting portions between the outer surface fiber layer on the first surface side and the outer surface fiber layer on the second surface side, and a hollow portion between the connecting portions
  • the hollow portion provides a non-woven fabric which is continuous in the planar direction of the non-woven fabric.
  • the present invention relates to a non-woven fabric having excellent breathability in the thickness.
  • the inside of the absorbent article such as a diaper or a sanitary napkin, when worn on the body, is humidified by sweat from the skin and water vapor from excrement. If the humidity is too high, it will lead to the occurrence of redness and itching of the skin and adversely affect the skin.
  • nonwoven fabrics are generally sheet-like fiber assemblies, there are few air paths, and various studies have been made to improve air permeability.
  • a non-woven fabric provided with an aperture can be mentioned. However, this is only an opening in the thickness direction, and the inside of the non-woven fabric other than the opening has low air permeability.
  • Such non-woven fabrics still have room for improvement in order to obtain the air permeability sufficient to ventilate the moisture inside the absorbent article.
  • the nonwoven fabric of the present invention is excellent in air permeability in the thickness inside.
  • FIG. 1 shows the nonwoven fabric 10 of the present embodiment.
  • the nonwoven fabric 10 has a first surface side Z1 and a second surface side Z2 which is the opposite surface side of the first surface side Z1.
  • the first surface side Z1 and the second surface side Z2 are the front and back surface sides of the nonwoven fabric 10.
  • the nonwoven fabric 10 can be applied to, for example, a surface sheet of an absorbent article such as a sanitary napkin or disposable diaper. When using as a surface sheet, you may use either side toward a wearer's skin surface.
  • FIG. 2 shows an example of a diaper 200 in which the nonwoven fabric 10 is disposed as the top sheet 201 with the first surface Z1 facing the skin surface of the wearer. That is, in this example, the outer surface fiber layer 1 on the first surface side Z1 is directed to the skin surface side of the wearer.
  • the diaper 200 includes, in addition to the top sheet 201, an absorbent body 203 sandwiched between the back sheet 202 on the clothes side, the top sheet 201, and the back sheet 202. Furthermore, in the present embodiment, a side leakage prevention gathers 207 formed by the side sheets are provided.
  • the diaper 200 shows the tape type which fixes and mounts the fastening tape 206 of the back side R to the ventral side F, it is not limited to this and may be a pants type. Moreover, it is applicable to various absorbent articles other than a diaper, such as a sanitary napkin, for example.
  • the surface to which hot air is applied at the time of manufacture is the second surface side Z2, but even if it has the same shape as the non-woven fabric 10, the hot air is applied from the first surface side Z1.
  • the fusion points of the fibers on the first surface side Z1 may be increased.
  • the nonwoven fabric 10 has the structure where the 1st nonwoven fabric layer 5 and the 2nd nonwoven fabric layer 6 were laminated
  • the present invention is not construed as being limited thereby.
  • the nonwoven fabric 10 of the present embodiment has a thermoplastic fiber. In thermoplastic fibers, at least some of the fibers are fused at intersections.
  • the non-woven fabric 10 has a thickness shaped in a shape different from that of the conventional sheet-like non-woven fabric, as described below. Specifically, as shown in FIGS. 1, 3 and 4, the nonwoven fabric 10 has an outer surface fiber layer 1 on the first surface side Z1, an outer surface fiber layer 2 on the second surface side Z2, and an outer surface fiber layer on the first surface side Z1.
  • the non-woven fabric 10 is bulky and thick as the connecting portion 3 connects and supports the outer surface fiber layer 1 on the first surface side Z1 and the outer surface fiber layer 2 on the second surface side Z2.
  • the thickness of the non-woven fabric 10 refers not to the local thickness of only the outer surface fiber layers 1 and 2 and the connecting portion 3 but to the apparent thickness of the shaped non-woven fabric as a whole. In the present embodiment, the thickness is the thickness between the surface of the first surface side Z1 and the surface of the second surface side Z2. This thickness is also referred to as the apparent thickness of the nonwoven fabric 10.
  • thermoplastic fibers are fused at intersections of at least a part of the fibers also in the outer surface fiber layers 1 and 2, the connection portion 3, and each portion other than the connection portion.
  • the nonwoven fabric 10 may have intersections at which the thermoplastic fibers do not fuse together.
  • the non-woven fabric 10 may contain fibers other than thermoplastic fibers, including the case where the thermoplastic fibers fuse at the intersection with other fibers.
  • connection part 3 is in the state which stood up in the thickness direction of the nonwoven fabric 10.
  • the connection portion 3 is preferably vertically connected to the outer surface fiber layers 1 and 2 like a column.
  • the nonwoven fabric 10 has a hollow portion 4 between the connection portions 3 and 3.
  • the hollow portion 4 is a space partitioned by the connecting portion 3 inside the non-woven fabric 10. Further, it is preferable that the front and back of the hollow portion 4, that is, the first surface Z1 side and the second surface Z2 side, be covered with the outer surface fiber layers 1 and 2 and not open in the thickness direction.
  • the "hollow part” mentioned here is a space which is not substantially filled with non-woven fibers.
  • the hollow portion 4 is inside the non-woven fabric 10, which means that the fiber amount is 20 fibers / mm 2 or less, and it is preferable that the space is not provided with fibers from the viewpoint of air permeability.
  • the above fiber amount is measured as follows.
  • the nonwoven fabric 10 is cut in the thickness direction so as to pass through a region to be measured (for example, between connecting portions).
  • the cut surface is magnified using a scanning electron microscope and the cross sections of the cut fibers in the cut surface per fixed area are counted.
  • the magnification observation is adjusted to a magnification (150 times or more and 500 times or less) which can measure about 30 to 60 fiber cross sections.
  • it converts into the number of cross sections of the fiber per 1 mm ⁇ 2 >, and makes this a fiber density (book / mm ⁇ 2 >).
  • the measurement was performed at three points, and the average was taken as the fiber density of the sample.
  • As the scanning electron microscope JCM-5100 (trade name) manufactured by JEOL Ltd. is used.
  • the hollow portion 4 is continuous in the planar direction of the nonwoven fabric 10. This "continuous" can be referred to as a state in which the individual regions of the hollow portion 4 divided by the connection portion 3 are connected in the planar direction, or a state in which one hollow portion extends in the planar direction It can also be said.
  • the hollow portion 4 forms a ventilating passage through this continuation.
  • exhaust of the nonwoven fabric outward in the plane direction in the thickness inside of the non-woven fabric between the outer surface fiber layer 1 on the first surface side Z1 and the outer surface fiber layer 2 on the second surface side Z2 It can be done.
  • suction into the hollow part 4 via the outer fiber layers 1, 2 may occur.
  • metabolism of air around and inside the non-woven fabric 10 is performed. This action is more effectively expressed in response to the pressing in the thickness direction of the non-woven fabric 10.
  • the non-woven fabric 10 has a structure in which air is released in the planar direction in the hollow portion 4 sandwiched between the outer surface fiber layers 1 and 2, and thereby, the air permeability to the horizontal rear inside the non-woven fabric thickness is excellent. Then, when the non-woven fabric 10 is incorporated as a component of the absorbent article (for example, a surface sheet in contact with the skin, an intermediate sheet between the surface sheet and the liquid-retaining absorbent), the humidity in the absorbent article at the time of use is reduced. It can be effectively reduced.
  • the absorbent article for example, a surface sheet in contact with the skin, an intermediate sheet between the surface sheet and the liquid-retaining absorbent
  • the hollow portion 4 is preferably continuous along a plurality of different directions intersecting in plan view from the viewpoint of making the air permeability of the non-woven fabric 10 better.
  • the non-woven fabric 10 has a structure in which the connection portions 3 and 3 which define the hollow portion 4 support the flat surface of the outer surface fiber layers 1 and 2 in the thickness direction.
  • the three-dimensional structure of the nonwoven fabric 10 is hard to be crushed, and the shape after pressing is easily recovered.
  • the non-woven fabric 10 can maintain the air permeability of the non-woven fabric 10 inside by the hollow portion 4 and can maintain the effect of reducing the humidity in the absorbent article incorporating the non-woven fabric 10 to provide a skin-friendly effect.
  • connection part 3 is the nonwoven fabric 10 in alignment with the height of the thickness direction of the nonwoven fabric 10, and the extension direction of the outer surface fiber layers 1 and 2 from a viewpoint of holding the space of the hollow part 4 so that the three-dimensional structure mentioned above hardly collapses. It is preferable to have the wall surface provided with the extension length (width) of the planar direction. Furthermore, it is preferable that the said wall surface of the connection part 3 is distribute
  • the hollow portions 4 are preferably continuous without any barrier that blocks the movement of air, and are more preferably linear. This is to reduce the loss due to the bending of the air flow due to the obstacle or the flow path, and to effectively express the aeration in the inside described above.
  • the air passage formed by the hollow portion 4 is a tubular space that covers the inside of the non-woven fabric 10 in the planar direction. Further, it is preferable that the air passage reaches the end of the non-woven fabric 10.
  • the non-woven fabric 10 has a sufficient thickness (bulk) to secure an air passage without increasing the amount of fibers due to the three-dimensional structure in the thickness direction of the outer surface fiber layers 1 and 2 and the connecting portion 3. . Therefore, the non-woven fabric 10 has more flexibility because it bends without resistance when the non-woven fabric is bent, as compared with the one in which the fiber amount is simply increased to give a thickness.
  • the nonwoven fabric 10 preferably has the following range of thickness and basis weight from the viewpoint of making the air permeability excellent. 2 mm or more is preferable, as for the apparent thickness of the whole nonwoven fabric, 3 mm or more is more preferable, and 4 mm or more is still more preferable. Further, the upper limit of the apparent thickness is not particularly limited, but in the case of using as a surface sheet of the absorbent article, from the viewpoint of making the portability good, 10 mm or less is preferable, 9 mm or less is more preferable, 8 mm The following is more preferable.
  • the basis weight of the entire nonwoven fabric 10 having the apparent thickness is preferably 80 g / m 2 or less, more preferably 70 g / m 2 or less, more preferably 60 g / m 2 or less.
  • the flow path of air from the viewpoint of successfully formed preferably 8 g / m 2 or more, 10 g / m 2 or more More preferably, 15 g / m 2 or more is more preferable.
  • Apparent thickness measurement method of nonwoven fabric The nonwoven fabric to be measured is cut into 10 cm ⁇ 10 cm. If 10 cm x 10 cm can not be taken, cut it into the largest possible area. The thickness at a load of 50 Pa is measured using a laser thickness gauge (ZSLD 80 (trade name) manufactured by OMRON Corporation). Three locations are measured, and the average value is taken as the apparent thickness of the non-woven fabric 10.
  • ZSLD 80 laser thickness gauge manufactured by OMRON Corporation. Three locations are measured, and the average value is taken as the apparent thickness of the non-woven fabric 10.
  • Measuring the basis weight of nonwoven fabric Cut the nonwoven fabric to be measured into 15 cm x 15 cm. If 10 cm x 10 cm can not be taken, cut it into the largest possible area. Use a balance to measure the weight, and divide by area to make it a basis weight.
  • FIG. 1 the more specific structure of the nonwoven fabric 10 in this embodiment is demonstrated with reference to FIG.1, 3 and 4.
  • FIG. 1 is a diagrammatic representation of the nonwoven fabric 10 in this embodiment.
  • the non-woven fabric 10 is a laminate of the first non-woven fabric layer 5 on the first surface Z1 side and the second non-woven fabric layer 6 on the second surface Z2 side.
  • the nonwoven fabric 10 has the following three-dimensional structure, and has an uneven surface on one side. That is, the first non-woven fabric layer 5 includes the outer fiber layer 1 on the first surface Z1 side and the connecting portion 3 described above, and the second non-woven fabric 6 forms the outer fiber layer 2 on the second surface Z2 side described above There is.
  • the 1st nonwoven fabric layer 5 has crevice 7 opened to the 1st field Z1 side, and concavo-convex field 8 by the 1st surface Z1 side is provided with crevice 7 and outer surface textiles layer 1.
  • the second non-woven fabric 6 has a substantially flat shape, and is continuously disposed in a planar manner over the entire second surface Z2 side as the outer surface fiber layer 2 on the second surface Z2 side of the non-woven fabric 10 There is.
  • the 2nd nonwoven fabric 6 may be completely flat, and may have some height differences. A flat surface is preferable from the viewpoint of securing the air flow path.
  • the height difference of the second nonwoven fabric 6 is smaller than the height difference of the first outer surface fiber layer 11 and the recess bottom portion 71.
  • substantially flat as used herein means that the height difference of the unevenness is smaller than the height difference of the first outer surface fiber layer 11 and the recess bottom portion 71.
  • the recessed part 7 opened to the 1st surface side Z1 which is one surface side is distribute
  • Intake can be made possible in the recess 7 and the aforementioned air permeability can be enhanced.
  • the recessed part 7 is enclosed by the wall surface which the connection part 3 mentioned above makes from a viewpoint of the shape recovery property at the time of compression. The relationship between the recess 7 and the hollow portion 4 via the connecting portion 3 will be described later.
  • the recess 7 has a recess bottom portion 71 formed of the fiber layer of the first non-woven fabric 5 on the second surface side Z2.
  • the recess bottom portion 71 abuts and is joined to the second non-woven fabric layer 6 to constitute a part of the outer surface fiber layer 2. That is, in the present embodiment, the outer surface fiber layer 2 on the second surface Z2 side has a two-layer structure partially at the position where the recess 7 is disposed.
  • a plurality of two-layer structures are disposed in the planar direction on the second surface Z2 side to increase the strength of the non-woven fabric 10 on the second surface Z2 side and to suppress the deformation on the second surface Z2 side.
  • the support by the two-layer structure makes it difficult for the entire collapse of the three-dimensional structure of the nonwoven fabric 10 to occur.
  • the space of the recess 7 is partitioned with the recess bottom 71 as a bottom and the connecting portion 3 as a wall.
  • the connection portion 3 connects the end of the outer surface fiber layer 1 and the end of the recess bottom portion 71.
  • the hollow portion 4 described above is provided between the first nonwoven layer 5 and the second nonwoven layer 6. Specifically, the hollow portion 4 is in a region surrounded by the outer surface fiber layer 1 of the first non-woven fabric layer 5, the connection portion 3 and the outer surface fiber layer 2 formed by the second non-woven fabric layer 6. Unlike the recess 7, the hollow portion 4 is covered with the outer surface fiber layer 1 and the outer surface fiber layer 2 as described above and has no opening in the thickness direction. The hollow portion 4 is adjacent to the recess 7 with the connecting portion 3 interposed as a common wall portion. This point will be described in more detail later.
  • the outer surface fiber layer 1 on the first surface side Z1 has two types of portions.
  • the two types of parts are the first outer surface fiber layer 11 and the second outer surface fiber layer 12 disposed on the first surface side Z1. These have the length extended along each of the different direction which planarly crosses the nonwoven fabric 10, respectively.
  • the extending direction is the X direction and the Y direction orthogonal to each other along the side of the non-woven fabric 10.
  • the Y direction is the longitudinal direction of the nonwoven fabric 10
  • the X direction is the width direction of the nonwoven fabric 10.
  • one first outer surface fiber layer 11 extends continuously in the Y direction in plan view of the nonwoven fabric 10 and is continuous over the entire length of the nonwoven fabric 10.
  • a plurality of first outer surface fiber layers 11 extending in the Y direction are spaced apart from each other in the X direction orthogonal to the Y direction.
  • the other second outer surface fiber layer 12 extends in the X direction, and is disposed to connect the first outer surface fiber layers 11 spaced apart and parallel in the X direction. “Connecting the first outer surface fiber layers 11” means that the second outer surface fiber layers 12 adjacent to each other across the first outer surface fiber layer 11 are aligned in a straight line. Specifically, the difference between the width center line extending in the X direction of the second outer surface fiber layer 12 and the width center line extending in the X direction of the second outer surface fiber layer 12 adjacent to the first outer surface fiber layer 11 therebetween.
  • the position of the first surface side Z1 of the second outer surface fiber layer 12 is slightly lower than that of the first outer surface fiber layer 11. Therefore, the length of the second outer surface fiber layer 12 is divided in the X direction by the interposition of the first outer surface fiber layer 11, and the plurality of second outer surface fiber layers 12 form a line in the X direction while being separated from each other. Further, the width (the width in the Y direction) of the second outer surface fiber layer 12 is narrower than the width (the width in the X direction) of the first outer surface fiber layer 11.
  • a plurality of such rows of the second outer surface fiber layer 12 in the X direction are further spaced apart from one another in the Y direction.
  • the shape of the second outer surface fiber layer is not limited to that of the present embodiment.
  • the position and the width of the first surface side Z1 may be the same as that of the first outer surface fiber layer 11.
  • the second outer surface fiber layer 12 according to the present embodiment the spreading of the pressing force in the planar direction can be suppressed, which is preferable.
  • the “different directions intersecting in plan view”, which are the extending directions, are not limited to the X direction and the Y direction. If it is the cross direction in the plane direction of nonwoven fabric 10, various aspects can be taken. As described later, from the viewpoint of making the compression recovery property or cushioning property after compressive deformation of the non-woven fabric 10 more excellent and the viewpoint that the longitudinally oriented fibers of the connection part are easily produced, “crossing in different directions crossing in plan view” The angle is most preferably the cross angle (90 °) between the machine direction (MD) direction of the surface fiber and the cross direction (cross direction) orthogonal to the machine direction.
  • a plurality of recessed portion bottom portions 71 are disposed apart from each other.
  • the recess bottom portion 71 covers the separated space of the first outer surface fiber layers 11, 11 on the first surface side Z1, and extends in the extension direction (Y direction) of the outer surface fiber layer 11.
  • a plurality of rows are spaced apart from one another along the row.
  • the rows in the Y direction of the recess bottom 71 are spaced apart from each other in the X direction orthogonal to the Y direction. That is, the recess bottom 71 is also arranged in the X direction.
  • the arrangement direction of the recess bottom portions 71 coincides with the extension direction of the outer surface fiber layer 1. Therefore, when the extension direction of the outer surface fiber layer 1 takes a direction different from the X direction and the Y direction, the arrangement direction of the outer surface fiber layer 2 also becomes a direction different from the X direction and the Y direction accordingly.
  • the connecting part 3 has two parts. One is a first connecting portion 31 which connects the first outer surface fiber layer 11 on the first surface side Z1 and the recess bottom portion 71 on the second surface side Z2 in the thickness direction. The other is a second connecting portion 32 which connects the second outer surface fiber layer 12 on the first surface side Z1 and the recess bottom portion 71 on the second surface side Z2 in the thickness direction.
  • a plurality of connection parts 3 are arranged to be separated from one another in the planar direction of the nonwoven fabric 10 in accordance with the separation arrangement of the outer surface fiber layer 1 and the recess bottom part 71.
  • connection portion 3 connects the end portions of the outer surface fiber layer 1 and the recess bottom portion 71. More specifically, the first connecting portion 31 connects the end portion 11A of the first outer surface fiber layer 11 and the end portion 71A of the recess bottom portion 71. On the other hand, the second connecting portion 32 connects the end portion 12A of the second outer surface fiber layer 12 and the end portion 71A of the recess bottom portion 71.
  • connection portion 3 has a wall surface having a height in the thickness direction and a width extending in the plane direction as described above, and connects the outer surface fiber layer 1 and the recess bottom portion 71 by the surface.
  • the wall surfaces formed by the connecting portion 3 are along different directions crossing in plan view of the non-woven fabric 10 as described below from the viewpoint of maintenance of the three-dimensional structure of the non-woven fabric 10, partial sinking and good compression recovery. It is preferable that it is distribute
  • the first connection portion 31 has a length (width) that matches the side in the Y direction of the recess bottom portion 71 on the second surface side Z2, and the first outer surface fiber layer 11 on the first surface side Z1.
  • the second connection portion 32 has a length (width) that matches the X direction side of the recess bottom portion 71 on the second surface side Z2, and extends the second outer surface fiber layer 12 on the first surface side Z1. It has a wall along the direction. That is, the wall surface of the second connection portion 32 is disposed along the X direction.
  • the direction along the wall surface of the connecting portion 3 coincides with the extension of the outer fiber layer 1. Therefore, when the extension direction of the outer surface fiber layer 1 takes a direction different from the X direction and the Y direction, the direction along the wall surface of the connecting portion 3 also becomes a direction different from the X direction and the Y direction accordingly.
  • the nonwoven fabric 10 Since the first connecting portion 31 and the second connecting portion 32 have the assembled structure intersecting each other as described above, the strength as a column supporting the outer surface fiber layers 1 and 2 is enhanced. Thereby, the nonwoven fabric 10 has high three-dimensional shape retentivity, and the high air permeability of the hollow portion 4 is maintained.
  • the hollow part 4 also has two parts.
  • One of the hollow portions 4 is a first hollow portion 41 in a region surrounded by the first outer surface fiber layer 11, the first connecting portion 31 and the outer surface fiber layer 2.
  • the other is a second hollow portion 42 in a region surrounded by the second outer surface fiber layer 12, the second connecting portion 32 and the outer surface fiber layer 2.
  • the hollow portion 4 is preferably continuous along a plurality of different directions crossing in plan view of the nonwoven fabric 10 from the viewpoint of air permeability.
  • the first hollow portion 41 extends along the extending direction (Y direction) of the first outer surface fiber layer 11 and the first connecting portion 31 and is continuous in the Y direction.
  • the first hollow portion 41 forms an air passage 41A penetrating in the Y direction.
  • the second hollow portion 42 extends along the extending direction (X direction) of the second outer surface fiber layer 12 and the second connecting portion 32, and is continuous in the X direction intersecting with the Y direction.
  • the second hollow portion 42 forms an air passage 42A penetrating in the X direction.
  • the air passages 41A and the air passages 42A are respectively arranged in a plurality of rows.
  • the respective air passages 41A and the air passages 42A are connected with each other in the intersecting region to form a communicating space.
  • the hollow part 4 which consists of the 1st hollow part 41 and the 2nd hollow part 42 is connected in the different direction (X direction and Y direction) which mutually cross
  • the hollow portion 4 includes a plurality of continuous hollow members in different directions (X direction and Y direction) intersecting with each other in the plane direction of the nonwoven fabric 10 and is connected in a mesh shape.
  • the hollow portion 4 connected in a reticulated shape has no barrier due to the fiber layers of the non-woven fabric 10 (for example, the outer surface fiber layers 1 and 2 and the connecting portion 3), and the air moves freely in all directions through the tubular spaces of the air passages 41A and 42A. Is possible.
  • the hollow portions 4 are connected in a reticulated manner, it is possible to continuously perform the metabolism of air in cooperation with other air passages even if a part of a plurality of air passages is crushed.
  • the continuity of ventilation by the hollow portion 4 is further enhanced by the structure that supports the flat surface of the outer fiber layers 1 and 2 on the surface of the connecting portion 3 that divides the hollow portion 4.
  • the direction in which the hollow portions 4 are connected is not limited to the two directions of the X direction and the Y direction as long as they are different directions crossing each other in the planar direction of the nonwoven fabric 10, and various directions can be taken. Further, different directions crossing each other are not limited to two directions, and may be three directions or more.
  • the flow passage area of the air passage formed by the hollow portion 4 is preferably in the following range from the viewpoint of effectively exerting the above-described function in the cross section.
  • Flow passage area of the air passage 41A which is a first hollow portion 41 formed, in cross section, 1.5 mm 2 or more is preferable per one flow path, more preferably 2.3 mm 2 or more, more preferably 3 mm 2 or more.
  • the flow passage area of the air flow passage 41A is preferably 7.8 mm 2 or less per flow passage, more preferably 7 mm 2 or less, and still more preferably 6.2 mm 2 or less. .
  • the flow passage area of the air passage 41A is, 1.5 mm is preferably 2 or more 7.8 mm 2 or less per one flow path, more preferably 2.3 mm 2 or more 7 mm 2 or less, 3 mm 2 or more 6.2 mm 2 The following is more preferable.
  • the cross-sectional area of the air passage 42A formed by the first hollow portion 42 is preferably 2.3 mm 2 or more, more preferably 3.5 mm 2 or more, and still more preferably 4.5 mm 2 or more. preferable.
  • the flow passage area of the air passage 42A from the viewpoint of ensuring the strength of the nonwoven fabric in a cross section, 11.6 mm 2 or less are preferable per one flow path, more preferably 10.5 mm 2 or less, 9.3 mm 2 or less More preferable.
  • the flow passage area of the air passage 42A is preferably 2.3 mm 2 or more 11.6 mm 2 or less, 3.5 mm 2 or more 10.5mm, more preferably 2 or less, 4.5 mm 2 or more 9.3 mm 2 The following is more preferable.
  • the flow passage area of the ventilation passage 41A is smaller than the flow passage area of the ventilation passage 42A.
  • the nonwoven fabric to be measured is cut at right angles to the direction in which the hollow portion extends to obtain a cut surface of the hollow portion. Measure the area of the hollow part 4, that is, the area of the air passage, by enlarging the cut surface to a size (10 to 100 times) which can be sufficiently measured within the field of view with a digital microscope (trade name: VHX-1000) made by Keyence Corporation. Do.
  • the connecting portion 3 is preferably a portion in which the fibers are oriented in the thickness direction of the nonwoven fabric 10 from the viewpoint of maintaining the space of the hollow portion 4.
  • the fibers of the connecting part 3 are oriented in the thickness direction of the nonwoven fabric 10 means that the longitudinal orientation ratio of the fibers obtained by the measurement method described later is 60% or more. It can be said that the connecting portion 3 is vertically disposed in the thickness direction of the nonwoven fabric 10 by having the longitudinal orientation ratio of the fibers in this range.
  • the connecting portion 3 has a longitudinal orientation ratio of fibers of 60% or more and partially fused between the fibers, and thus stands up like a pillar, and is appropriate in the thickness direction of the nonwoven fabric 10 Give elasticity.
  • the non-woven fabric since the fibers of the conventional non-woven fabric do not have the longitudinal orientation ratio of the fibers as in the connecting portion 3 of the present embodiment, the non-woven fabric It deforms to fill in and the amount of deformation increases according to the force.
  • the connection portion 3 supports the outer surface fiber layers 1 and 2 like a pillar and can withstand a slight force from the same direction because it is perpendicular to the thickness direction.
  • the column is deformed so as to break when a large force is applied.
  • deformation similar to the so-called buckling phenomenon which is not found in conventional non-woven fabrics, occurs (hereinafter also referred to as buckling deformation).
  • the nonwoven fabric 10 can restore its original thickness by the elastic force of the constituent fibers.
  • the longitudinal orientation ratio of the fibers of the connecting portion 3 defined above is preferably 63% or more, and more preferably 65% or more. 68% or more is more preferable.
  • the upper limit is not particularly limited, but the longitudinal orientation ratio is preferably 90% or less from the viewpoint of forming a fusion point by forming intersection points between fibers and forming fibers in a columnar shape to withstand a force. 85% or less is more preferable, and 80% or less is still more preferable.
  • the longitudinal orientation ratio of the connection portion 3 is preferably 63% to 90%, more preferably 65% to 85%, and still more preferably 68% to 80%.
  • the outer surface fiber layer 1 and the outer surface fiber layer 2 are portions in which fibers are oriented in the planar direction on the front and back (first surface side Z1 and second surface side Z2) of the nonwoven fabric 10 respectively.
  • the fibers are oriented in the planar direction means that the longitudinal orientation ratio of the fibers obtained by the measurement method described later is less than 45%.
  • the longitudinal orientation ratio of the fibers is 0% or more, and more preferably to 30% or more from the outer surface fiber layer oriented in the planar direction.
  • connection part 3 is connected seamlessly with the outer surface fiber layers 1 and 2 in which the fibers are oriented in the planar direction at the end, in that part, the fibers oriented in the planar direction are oriented in the thickness direction And mixed fibers.
  • the portion corresponding to the definition of the above range is referred to as the connecting portion 3.
  • the longitudinal orientation ratio of the fibers is diagonally oriented at 45% to 60%, the fibers being preferred. It is more preferable that the longitudinal orientation ratio of the film gradually shifts from 45% to a sufficient longitudinal orientation of 60% or less.
  • a cross section (FIGS. 3 and 4) in the thickness direction passing through the line AA and the line BB in FIG. 1 is prepared.
  • the cross section in the thickness direction passing through the line AA shown in FIG. 3 is a cross section orthogonal to the longitudinal direction (Y direction) of the nonwoven fabric from which the first connection portion 31 extends.
  • the cross section in the thickness direction passing through the line B-B shown in FIG. 4 is a cross section orthogonal to the width direction (X direction) of the nonwoven fabric from which the second connection portion 32 extends.
  • the said cross section shall cut off the nonwoven fabric of a measuring object 5 mm x 5 mm or more.
  • Fibers passing through a square reference line orthogonal to the planar direction of the non-woven fabric are defined as "the number of transverse fibers", and fibers passing through a square reference line orthogonal to the thickness direction of the non-woven fabric are defined as "the number of longitudinal fibers”.
  • connection part 3 is hard to be crushed with respect to the pressing force in the thickness direction as a fiber layer that divides the space of the hollow part 4 by having the orientation of the fibers described above. Even in the case of buckling deformation due to strong pressing force, the connection portion 3 has high shape recovery. That is, with respect to the pressing force that is pushed in the thickness direction, the non-woven fabric 10 sinks by buckling deformation while maintaining elasticity due to the orientation of the fibers of the connecting portion 3, and when compression deformation is released The elastic restores the nonwoven fabric 10 to its original apparent thickness. Thereby, even if the nonwoven fabric 10 is touched repeatedly, cushioning properties can be returned, and the cushioning properties can be made high in sustained power.
  • the orientation in the thickness direction of the fibers in the connecting portion 3 is preferably provided in at least one of the first connecting portion 31 and the second connecting portion 32 in which the directions of the surfaces described above are different, and the first connecting portion 31 and the second connecting portion 32 It is more preferable to provide in both.
  • the fibers are oriented in the thickness direction of the non-woven fabric 10 in any of the first connecting portion 31 and the second connecting portion 32 having different surface orientations.
  • This means that the fibers are oriented in the thickness direction regardless of the direction in which the connecting portion 3 is directed regardless of the longitudinal direction and the width direction of the nonwoven fabric 10.
  • the connecting portions 3 oriented in such a plurality of different directions are oriented in the thickness direction You can not do it. Even if there is orientation, it is only one direction in the machine flow (MD) direction at the time of non-woven fabric production.
  • MD machine flow
  • the fiber orientation in the thickness direction defined as above in the connecting portions 3 (in the present embodiment, the connecting portions 31 and 32 having mutually orthogonal planes) facing in any direction
  • the above-described buckling deformation in the connecting portion 3 suitably occurs and the nonwoven fabric 10 is appropriate Excellent cushioning with elasticity is developed.
  • the recessed part 7 opened to the 1st surface Z1 side is distribute
  • the hollow portion 4 and the concave portion 7 are adjacent to each other with the connecting portion 3 interposed as a common wall portion.
  • the recess 7 is disposed at a position adjacent to both the first hollow portion 41 and the second hollow portion 42 according to the configuration as described below.
  • the recess 7 is surrounded by the wall surfaces of the four connecting portions 3 erected from the four sides of the recess bottom portion 71 around the planar direction.
  • a plurality of concave portions 7 having such a configuration are arranged to be separated from each other in the X direction and the Y direction. In this arrangement, the recesses 7 are independent without communicating with each other.
  • the shape formed by the four connecting portions 3 surrounding the recess 7 and the recess bottom 71 is in the shape of a prism or a frustum.
  • the shape of the recessed part 7 is not limited to this, It can be set as various shapes, as long as the effect
  • connection portions 3 which define the recess 7 are two first connection portions 31 and two second connection portions 32.
  • the first connection portion 31 is disposed to face the surface in the Y direction
  • the second connection portion 32 is disposed to face the surface in the X direction, and these are intersected and combined with each other.
  • the recess 7 is adjacent to the first hollow portion 41 via the first connection portion 31 and adjacent to the second hollow portion 42 via the second connection portion 32 in one configuration.
  • the taken-in air can be simultaneously supplied to both the 1st hollow part 41 and the 2nd hollow part 42.
  • air can be sent in from the side to the 1st hollow part 41 and the 2nd hollow part 42 via the 1st connecting part 31 and the 2nd connecting part 32.
  • the air can be continuously sucked into the hollow portion 4.
  • the presence of the recess 7 acts to suppress the spread of the pressing force in the planar direction of the non-woven fabric 10 in combination with the fiber orientation of the connecting portion 3 described above. That is, the outer surface fiber layer 1 on the first surface Z1 side is hardly made to sink by the interposition of the concave portion 7. Thereby, in the nonwoven fabric 10, the compressive deformation (buckling deformation) limited to the vicinity of the force point of the pressing force described above can be more effectively developed. At this time, when there is an intersection of the connecting portions 3 surrounding the recess 7, the three-dimensional structure of the entire nonwoven fabric 10 is easily maintained, combined with the fiber orientation in the thickness direction defined above. Thereby, the shape recovery property after the buckling deformation occurs in other than the crossing part of the connection part 3 is high, and the cushioning property can be further enhanced.
  • the concave surface 7 is opened to the first surface side Z1, so that the skin surface of the person who presses, for example, the finger surface can partially enter.
  • the cushioning feeling of the sinking of the outer fiber layer 1 due to the buckling deformation of the connection portion 3 and the softer feeling in the recess 7 are obtained.
  • the skin surface of the body overlaps the recess 7, stress concentrates on the connecting portion 3 at the edge of the recess 7 and bending deformation of the connecting portion 3 is more likely to occur. Thereby, the cushioning property of the nonwoven fabric 10 becomes more preferable.
  • the plurality of independent recesses 7 are connected in the Y direction by the first outer surface fiber layer 11 while being separated from each other.
  • the shape of the surface of the first surface side Z1 of the nonwoven fabric 10 is easily maintained, and the shape recovery after pressing becomes more excellent, which is preferable.
  • the first outer surface fiber layer 11 and the second outer surface fiber layer 12 have different heights on the first surface side Z1, spreading of the pressing force in the plane direction of the nonwoven fabric 10 is suppressed, which is preferable.
  • the area ratio of the concave portion 7 to the surface of the first surface side Z1 of the non-woven fabric 10 is preferably 5% or more, more preferably 10% or more, and 15% or more from the viewpoint of effectively expressing the above-described action. More preferable. Further, from the viewpoint of securing nonwoven fabric strength and an air passage, the area ratio of the recess 7 is preferably 90% or less, more preferably 80% or less, and still more preferably 70% or less. Specifically, the area ratio of the recess 7 is preferably 5% to 90%, more preferably 10% to 80%, and still more preferably 15% to 70%.
  • Method of measuring area ratio of recess 7 Measure the area of the recess 7 by expanding the size (10x or more and 100x or less) where the site to be measured from the upper surface is sufficiently within the field of view with a digital microscope (trade name: VHX-1000) made by Keyence Corporation. The ratio is calculated from the whole and taken as the area ratio.
  • a male support material 120 and a female support material 130 for shaping the fiber web 110 before being made into a nonwoven fabric are used.
  • the fiber web 110 is placed on the male support member 120, and is held by the female support member 130 from above the fiber web 110 and sandwiched and shaped.
  • the fiber web 110 finally becomes the first nonwoven layer 5.
  • the male support body 120 has a plurality of protrusions 121 corresponding to the positions at which the four connecting portions 3 surrounding the concave portion 7 of the first nonwoven fabric layer 5 and the concave bottom portion 71 of the second surface side Z2 are shaped. Between the projections 121 and 121 of the male support member 120, concave portions 122 corresponding to positions at which the outer surface fiber layer 1 on the first surface side Z1 of the first nonwoven fabric layer 5 is shaped are formed. Thus, the male support member 120 has an uneven shape, and the protrusions 121 and the recesses 122 are alternately arranged in directions different from each other in plan view.
  • the bottom portion 123 of the concave portion 122 of the male support member 120 has a structure in which hot air blows off, and for example, a plurality of holes are arranged (not shown).
  • the “different direction” is preferably a direction that matches the Y direction (longitudinal direction) and the X direction (width direction) of the nonwoven fabric 10 as a support for producing the nonwoven fabric 10.
  • the Y direction corresponds to the machine flow direction in the present manufacturing method
  • the X direction corresponds to the width direction orthogonal to the machine flow direction.
  • the “different directions” differ depending on the uneven structure of the nonwoven fabric of the present invention, and are not limited to the Y direction and the X direction.
  • the female support 130 has grid-like protrusions 131 corresponding to the recesses 122 of the male support 120.
  • a recess 132 corresponding to the protrusion 121 of the male support member 120 is formed between the protrusions 131 and 131 of the female support member 130.
  • the female support member 130 has an uneven shape, and the protrusions 131 and the recesses 132 are alternately arranged in directions different from each other in plan view.
  • the bottom portion 133 of the concave portion 132 of the female support member 130 has a structure in which hot air blows off, and, for example, a plurality of holes are arranged.
  • the distance between the projections 131, 131 of the female support 130 is wider than the width of the projections 121 of the male support 120.
  • the distance is appropriately set so that the fiber web 110 can be sandwiched between the protrusions 121 of the male support 120 and the protrusions 131 of the female support 130 so that the connecting portion 3 in which the fibers are oriented in the thickness direction can be suitably shaped.
  • the fiber web 110 before being fused is supplied from a carding machine (not shown) to an apparatus for shaping the web so as to have a predetermined thickness.
  • the fiber web 110 is a raw material that finally becomes the first nonwoven fabric layer 5.
  • the fiber web 110 containing thermoplastic fibers is placed on the male support 120, and the female support 130 is pushed onto the male support 120 from the fiber web 110.
  • the protrusion 121 of the male support member 120 and the concave portion 132 of the female support member 130 are fitted.
  • the concave portion 122 of the male support member 120 and the protrusion 131 of the female support member 130 are fitted. This creates a shape in which the fibers are oriented in the thickness and planar directions.
  • the first hot air W1 is blown to the fiber web 110 from the side of the female support 130. That is, the first hot air W1 is blown from the side to be the second surface of the nonwoven fabric 10.
  • the fiber web 110 is fused to an extent that the uneven shape of the nonwoven fabric 10 can be maintained.
  • the fibers are very loosely fused.
  • the fiber web 110 has a high degree of freedom of movement of fibers. Therefore, the fibers are easily oriented in the thickness direction (longitudinal direction) on the surface of the male support member 120 facing in any direction around the protrusions 121.
  • the wall surface of the protrusion 121 of the support male 120 and the wall surface of the protrusion 131 of the support female 130 The connecting portion 3 of the first non-woven fabric layer 5 in which the fibers are oriented in the thickness direction is shaped.
  • the fiber web 110 since the fusion of the intersections of the fibers is not formed, the mobility of the fibers is high, and the direction of the fibers can be aligned in the blow-by direction of the first hot air W1. More specifically, as shown in FIG. 5 (B) and FIG.
  • the fibers of the fiber web 110 are aligned. That is, in any of the wall surface 131A along the machine flow direction (Y direction) of the protrusion 121 and the wall surface 131B along the width direction (X direction), the fibers are in the blow-by direction of the first hot air W1 regardless of the direction of the surface. Be aligned. Thereby, the structure which the fiber in the connection part 3 of the nonwoven fabric 10 orientated to the thickness direction can be formed.
  • the blowout of the first hot air W1 is suppressed, and the fibers are fused in the planar direction.
  • the fiber layer corresponding to the outer surface fiber layer 2 on the second surface side Z2 is shaped.
  • the fibers are oriented in the planar direction between the bottom of the recess 122 and the top of the protrusion 131. Since the projections 131 inhibit the hot air, the fiber layer to be formed is less fused and a smooth fiber layer can be obtained. Thereby, the fiber layer corresponding to the outer surface fiber layer 1 on the first surface side Z1 is shaped. At this time, the shape of the connecting portion oriented in the thickness direction is also maintained.
  • the arrows in the drawing schematically indicate the flow of the first hot air W1.
  • the temperature of the first hot air W1 is set to a temperature at which the thermoplastic fibers can be held in the longitudinally oriented shape. Considering a general fiber material used for this type of product, it is preferable that the melting point of the thermoplastic fiber constituting the fiber web 110 be higher by 0 ° C. to 70 ° C., higher by 5 ° C. to 50 ° C. More preferable.
  • the speed of the first hot air W1 is preferably 2 m / s or more, and more preferably 3 m / s or more, from the viewpoint of effective fusion.
  • the speed of the first hot air W1 is preferably 100 m / s or less, and more preferably 80 m / s or less, from the viewpoint of reducing the size of the device.
  • the fiber web 110 is temporarily fused and held in an uneven shape (hereinafter, the fiber web 110 is referred to as an uneven fiber web 111).
  • the height of the protrusions 121 of the male support member 120 and the height of the protrusions 131 of the male support member 130 are appropriately determined depending on the apparent thickness of the non-woven fabric 10 to be manufactured.
  • 2 mm or more is preferable, 3 mm or more is more preferable, 5 mm or more is more preferable, 15 mm or less is preferable, 10 mm or less is more preferable, and 9 or less is more preferable.
  • 2 mm or more and 15 mm are preferable, 3 mm or more and 10 mm or less are more preferable, and 5 mm or more and 9 mm or less are still more preferable.
  • the support female member 130 is removed, and as shown in FIG. 5C, the exposed surface of the uneven fiber web 111 (support male member 120) with the uneven fiber web 111 placed along the support male member 120.
  • the other fiber web 140 to be the second non-woven fabric layer 6 is placed on the side opposite to Next, the second hot air W2 is blown at a temperature at which the respective fibers of the uneven fiber web 111 and the fiber web 140 can be appropriately fused to further fuse the fibers.
  • the second hot air W2 is blown to the uneven fiber web 111 and the fiber web 140 from the side to be the second surface of the nonwoven fabric 10.
  • the temperature of the second hot air W2 at this time should be higher than the melting point of the thermoplastic fiber constituting the fiber web 110 by 0 ° C. or more and 70 ° C. or less in consideration of a general fiber material used for this type of product C. is preferable, and it is more preferable that the temperature is higher than 5.degree. C. and lower than 50.degree.
  • the wind speed of the second hot air W2 is preferably 2 m / s or more, and more preferably 3 m / s or more, although it depends on the height of the protrusions 121 of the male support member 120. As a result, the heat transfer to the fibers can be made sufficient to fuse the fibers together, and the fixing of the uneven shape can be made sufficient.
  • the process of spraying the first hot air W1 can be omitted by reducing the surface roughness of the female support member. By reducing the surface roughness, it is possible to remove the female backing member in the process of spraying the second hot air W2 without sticking the non-fused fibers. That is, after producing the web, it is possible to fit the male and female members of the support, remove the female as it is, and treat with the hot air W2. This makes processing simpler.
  • thermoplastic fiber what is normally used as a raw material of a nonwoven fabric can be employ
  • fibers made of a single resin component or composite fibers made of a plurality of resin components may be used.
  • the composite fiber include a core-sheath type, a side-by-side type, and the like.
  • the temperature of the hot air blown to 140 is higher than the melting point of the low melting point component and lower than the melting point of the high melting point component. More preferably, the temperature is 10 ° C. lower than the melting point of the low melting point component or higher than the melting point of the high melting point component, and still more preferably 20 ° C. or more higher than the melting point of the low melting point component by 5 ° C. or higher . Further, from the viewpoint of elasticity, among core-sheath composite fibers, the more the core which is the high melting point component, the higher the elasticity. Therefore, it is preferable that the core component be large in the cross-sectional area ratio.
  • the non-woven fabric 10 is manufactured as described above. Between the protrusion 122 of the male support member 120 and the protrusion 131 of the female support member 130, the fibers of the fiber web 110 are aligned and oriented in the thickness direction, and the connection portion 3 of the first non-woven fabric layer 5 is formed. At this time, the connecting portion 3 in which the fibers are oriented in the thickness direction (longitudinal direction) is formed on the surface facing in any direction around the protrusion 121. Thereby, the recessed part 7 enclosed by the four connection parts 3 which the 1st nonwoven fabric layer 5 has is formed. In addition, the recess bottom 71 of the first non-woven fabric layer 5 is formed between the top of the protrusion 121 and the bottom of the recess 132.
  • the outer surface fiber layer 1 on the first surface side Z1 of the first nonwoven fabric layer 5 is formed between the bottom of the recess 122 and the top of the protrusion 131 in which the fibers are oriented in the planar direction. While the fiber web 140 is flat, the fibers are fused to form the second outer fiber layer 2 composed of the second non-woven fabric layer 6. Thereby, the hollow part 4 enclosed by the outer surface fiber layer 1 of the 1st nonwoven fabric layer 5, the connection part 3, and the 2nd nonwoven fabric layer 6 (outer surface fiber layer 2) is formed.
  • the obtained non-woven fabric 10 has the lower surface in FIG. 5C as the first surface side Z1, and the opposite surface as the second surface side Z2. That is, the first surface side Z1 of the non-woven fabric 10 is the side on which the male support member 120 is disposed, and the second surface side Z2 is the side on which the first hot air W1 and the second hot air W2 are blown. Therefore, the fiber amount of the outer surface fiber layer 2 on the second surface side Z2 is smaller than that of the outer surface fiber layer 1 on the first surface side Z1 due to the difference in the blowing amount of the first hot air W1. Further, the number of fusion points of the fibers of the outer surface fiber layer 2 on the second surface side Z2 is larger than that of the outer surface fiber layer 1 on the first surface side Z1.
  • the surface of the outer surface fiber layer 1 on the first surface side Z1 has less feeling of roughness and a better touch than the surface of the outer surface fiber layer 2 on the second surface side Z2. Even if the process of spraying the first hot air W1 is omitted, the same effect can be obtained by the distance from the second hot air W2.
  • the fibers on the female support 130 side fibers to be the outer surface fiber layer 2 on the second surface Z2 of the non-woven fabric 10) are pulled toward the male support 120 more.
  • the outer surface fiber of the second surface Z2 formed on the top of the protrusion 121 of the male support member 120 rather than the outer fiber layer 1 of the first surface Z1 formed on the bottom of the recess 122 of the male support member 120 The amount of fibers in layer 2 is reduced.
  • the thickness of the non-woven fabric 10 is appropriately determined by the heights of the protrusions 121 of the male support member 120 and the protrusions 131 of the female support member 130.
  • the apparent thickness of the non-woven fabric 10 is increased, and when it is decreased, the apparent thickness of the non-woven fabric 10 is decreased.
  • the wind speed is increased, the apparent thickness of the non-woven fabric 10 is increased, and when it is decreased, the apparent thickness of the non-woven fabric 10 is decreased.
  • the height of the projections is increased, the fiber density of the non-woven fabric 10 is lowered, and when it is lowered, the fiber density of the non-woven fabric 10 is increased.
  • the wind speed is increased, the fiber density of the non-woven fabric 10 is lowered, and when it is decreased, the fiber density of the non-woven fabric 10 is increased.
  • the nonwoven fabric of the present invention can be used in various applications.
  • it can be used suitably as a surface sheet of absorbent articles, such as a disposable diaper for adults and infants, a sanitary napkin, a panty liner, and a urine absorption pad.
  • a surface sheet such as a diaper or a catamenial product and an absorber, a covering sheet (core wrap sheet) of an absorber, etc.
  • the form utilized as a surface sheet gathers, an exterior sheet, and wings of an absorptive article is mentioned.
  • the form utilized as a covering sheet of a wipe sheet, a cleaning sheet, a filter, and a heating implement is also mentioned.
  • the present invention discloses the following nonwoven fabrics further about the embodiment mentioned above.
  • Non-woven fabric which has a thermoplastic fiber and has the 1st surface side and the 2nd surface side which is the opposite surface side of the 1st surface side, Comprising: The external surface fiber layer of the said 1st surface side, the said 2nd surface side An outer surface fiber layer, a plurality of connecting portions between the outer surface fiber layer on the first surface side and the outer surface fiber layer on the second surface side, and a hollow portion between the connecting portions; Non-woven fabric continuous in the plane direction of non-woven fabric.
  • the flow passage area of the air passage formed by the hollow portion continuously in the longitudinal direction of the non-woven fabric out of a plurality of different directions crossing in plan view of the non-woven fabric is 1.5 mm 2 or more and 7.8 mm per flow passage in the cross section 2 or less, preferably 2.3 mm 2 or more, more preferably 3 mm 2 or more, preferably 7 mm 2 or less, more preferably nonwoven fabric according to the is 6.2 mm 2 or less ⁇ 2>.
  • the flow passage area of the air passage formed by the hollow portion continuously in the width direction of the non-woven fabric out of a plurality of different directions crossing in plan view of the non-woven fabric is 2.3 mm 2 or more 11.6 mm per flow passage in the cross section 2 or less, preferably 3.5 mm 2 or more, more preferably 4.5 mm 2 or more, and preferably, 10.5 mm 2 or less, more preferably 9.3 mm 2 or less wherein ⁇ 2> or The nonwoven fabric as described in ⁇ 3>.
  • ⁇ 5> The nonwoven fabric according to ⁇ 4>, wherein a flow passage area of the ventilation passage formed by the hollow portions in the longitudinal direction is smaller than a flow passage area of the ventilation passage formed by the hollow portions in the width direction.
  • ⁇ 6> The nonwoven fabric according to any one of ⁇ 1> to ⁇ 5>, wherein the fibers of the connection portion are oriented in the thickness direction of the nonwoven fabric.
  • the longitudinal orientation ratio of the fibers of the connection portion is 60% to 90%, preferably 63% or more, more preferably 65% or more, and preferably 85% or less, more preferably 80% or less.
  • ⁇ 8> The nonwoven fabric as described in said ⁇ 6> whose longitudinal orientation rate of the fiber of the said connection part is 65%-80%.
  • a wall surface including the height in the thickness direction of the non-woven fabric, and the width in the plane direction of the non-woven fabric along the extension direction of the outer surface fiber layer on the first surface side and the outer surface fiber layer on the second surface side The nonwoven fabric according to any one of ⁇ 1> to ⁇ 8>, wherein the wall surface is arranged along a plurality of different directions crossing in plan view of the nonwoven fabric.
  • ⁇ 10> The nonwoven fabric according to any one of the above ⁇ 1> to ⁇ 9>, which has an uneven surface on the first surface side of the nonwoven fabric.
  • ⁇ 11> The non-woven fabric according to ⁇ 10>, wherein the outer surface fiber layer on the first surface side of the non-woven fabric has two types of lengths extending along respective different directions crossing in plan view of the non-woven fabric.
  • One outer surface fiber layer of the two outer surface fiber layers on the first surface side extends continuously in the longitudinal direction in plan view of the non-woven fabric, and a plurality of the outer surface fiber layers cross each other in the width direction orthogonal to the longitudinal direction The non-woven fabric according to the above ⁇ 11>, which is spaced apart.
  • the other outer surface fiber layer of the two types of outer surface fiber layers on the first surface side extends in the width direction in plan view of the non-woven fabric and is arranged to connect the one outer surface fiber layer The nonwoven fabric as described in said ⁇ 12>.
  • ⁇ 14> The nonwoven fabric according to ⁇ 13>, wherein on the first surface side, the position of one surface of the non-woven fabric on the other outer surface fiber layer is lower than that of the one outer surface fiber layer.
  • the width in the longitudinal direction of the other outer surface fiber layer is narrower than the width direction width of the one outer surface fiber layer according to ⁇ 13> or ⁇ 14>.
  • a wall surface including the height in the thickness direction of the non-woven fabric, and the width in the plane direction of the non-woven fabric along the extension direction of the outer surface fiber layer on the first surface side and the outer surface fiber layer on the second surface side Have The nonwoven fabric according to any one of ⁇ 10> to ⁇ 15>, wherein the concave and convex surface is provided with a recess that is surrounded by the wall surface and opens to the first surface side.
  • the recess has a recess bottom on the second surface side, The recess bottom portion covers a space between the outer surface fiber layer on the first surface side on the second surface side, and extends in the longitudinal direction of the nonwoven fabric which is the extension direction of the outer surface fiber layer on the first surface side.
  • the nonwoven fabric according to ⁇ 16> wherein a plurality of the nonwoven fabrics are spaced apart from each other in a row.
  • ⁇ 18> The nonwoven fabric according to ⁇ 17>, wherein a plurality of longitudinal rows formed by the bottom of the concave portion are spaced apart from each other in a width direction orthogonal to the longitudinal direction.
  • ⁇ 19> The non-woven fabric according to any one of ⁇ 16> to ⁇ 18>, wherein the recesses are independent without communicating with each other.
  • ⁇ 20> The nonwoven fabric according to any one of ⁇ 1> to ⁇ 19>, wherein the outer surface fiber layer on the first surface side and the outer surface fiber layer on the second surface side cover the front and back of the hollow portion.
  • ⁇ 21> The nonwoven fabric according to any one of ⁇ 1> to ⁇ 20>, wherein the hollow portion is a space partitioned by the connection portion inside the nonwoven fabric.
  • ⁇ 22> The front and back of the hollow portion is covered with the outer surface fiber layer on the first surface side and the outer surface fiber layer on the second surface side, and the hollow portion is not open in the thickness direction.
  • the nonwoven fabric any one of 21>.
  • ⁇ 23> The nonwoven fabric according to any one of ⁇ 1> to ⁇ 22>, wherein the hollow portion has a fiber amount of 20 fibers / mm 2 or less, preferably a space in which no fiber is disposed.
  • the hollow portion continuously forms an air passage along a plurality of different directions crossing in plan view of the non-woven fabric,
  • the non-woven fabric according to any one of ⁇ 1> to ⁇ 23>, wherein the air passage extends to an end of the non-woven fabric.
  • the apparent thickness of the non-woven fabric is 2 mm or more and 10 mm or less, preferably 3 mm or more, more preferably 4 mm or more, and preferably 9 mm or less, more preferably 8 mm or less of the above ⁇ 1> to ⁇ 24>
  • the nonwoven fabric according to any one.
  • the basis weight of the non-woven fabric as a whole is 8 g / m 2 or more and 80 g / m 2 or less, preferably 70 g / m 2 or less, more preferably 60 g / m 2 or less, and preferably 10 g / m 2 or more,
  • the non-woven fabric is a laminate of a first non-woven fabric layer having an outer surface fiber layer on the first surface side and the connecting portion, and a second non-woven fabric layer forming an outer surface fiber layer on the second surface side.
  • ⁇ 29> The first nonwoven fabric layer has a recess opened to the first surface side, and the uneven surface on the first surface side is provided by the recess and the outer surface fiber layer on the first surface side.
  • Non-woven fabric. ⁇ 30> The non-woven fabric according to ⁇ 28> or ⁇ 29>, wherein the second non-woven fabric has a substantially flat shape and is continuously disposed in a planar shape over the entire second surface side.
  • ⁇ 32> The absorbent article which has a nonwoven fabric any one of said ⁇ 1>- ⁇ 31>.
  • ⁇ 33> The nonwoven fabric according to any one of the above ⁇ 1> to ⁇ 31>, as a surface sheet with one surface side being the surface opposite to the surface to which hot air hits at the time of production directed to the skin surface side of the wearer Absorbent article having.
  • An absorbent article comprising the nonwoven fabric according to any one of ⁇ 1> to ⁇ 31> as a surface sheet with the other surface side, which is the surface to which hot air hits during production, facing the skin surface side of the wearer.
  • the fiber web is placed on a male support material having a plurality of protrusions and a plurality of recesses disposed between the plurality of protrusions, and the protrusions and recesses of the male support material correspond to the top of the fiber web.
  • the manufacturing method of the nonwoven fabric which has the process of holding down and shaping in the support female material which has a recessed part and protrusion.
  • the bottom of the recess of the support male and the female support has a structure in which hot air blows through the fiber web, and the hot air is applied with the male support and the female support fitted.
  • the manufacturing method of the nonwoven fabric of the said ⁇ 35> description which has the process of spraying.
  • the spraying process by the first hot air W1 was performed under the conditions of a temperature of 160 ° C., a wind speed of 54 m / s, and a spraying time of 3 seconds.
  • the second hot air spraying was performed under the conditions of a temperature of 160 ° C., a wind speed of 6 m / s, and a spraying time of 3 seconds.
  • the nonwoven fabric sample S1 of Example 1 had the hollow portion 4 connected in a mesh shape shown in FIG. Specifically, the first hollow portion 41 is continuous in the Y direction which is the longitudinal direction of the nonwoven fabric sample S1, and the second hollow portion 42 is continuous in the X direction which is the width direction orthogonal to the longitudinal direction of the nonwoven fabric sample S1.
  • the 1st hollow part 41 and the 2nd hollow part 42 were connected by the crossing part, and the hollow part 4 was connected in mesh shape as whole nonwoven fabric sample S1.
  • the nonwoven fabric sample of Example 1 was equipped with the connection part 3 applicable to the above-mentioned definition.
  • the nonwoven fabric sample of Example 1 had the recessed part 7 opened to the 1st surface Z1 side.
  • Example 2 The nonwoven fabric shown in FIG. 1 was produced by an air through manufacturing method including the steps shown in FIG. 5 using thermoplastic fibers with a fiber diameter of 2.9 dtex. This was used as the non-woven fabric sample of Example 2.
  • the spraying process by the first hot air W1 was performed under the conditions of a temperature of 160 ° C., a wind speed of 54 m / s, and a spraying time of 3 s.
  • the second hot air spraying was performed at a temperature of 160 ° C., a wind speed of 6 m / s, and a spraying time of 3 s.
  • the first hollow portion 41 and the second hollow portion 42 were connected in a mesh shape.
  • thermoplastic fiber having a fiber diameter of 1.2 dtex Using a thermoplastic fiber having a fiber diameter of 1.2 dtex, a flat non-woven fabric which was not unevenly shaped by the air-through manufacturing method was produced and used as a non-woven fabric sample of the comparative example.
  • the uneven nonwoven fabric of the shape shown in FIG. 1 of Patent Document 1 described above is produced by using an thermoplastic fiber having a fiber diameter of 1.2 dtex, by an air through manufacturing method including the manufacturing process described in paragraph [0031] of the specification of the same document. did. This was used as the non-woven fabric sample of the reference example.
  • the spraying process by the first hot air W1 was performed under the conditions of a temperature of 160 ° C., a wind speed of 54 m / s, and a spraying time of 3 seconds.
  • the second hot air spraying was performed under the conditions of a temperature of 160 ° C., a wind speed of 6 m / s, and a spraying time of 3 seconds.
  • both the first protrusion on the first surface side and the second protrusion on the second surface were in the shape of a truncated cone having a rounded top, or in the shape of a hemisphere.
  • the measurement according to the above-mentioned was performed on this top, and the longitudinal orientation of the fibers at the top was 35%. It was oriented.
  • the hollow portion as in the examples 1 and 2 was not provided.
  • Examples 1 and 2 had air permeability three or more times that of the comparative example, and were excellent in air permeability.
  • first surface side outer surface fiber layer 11 first outer surface fiber layer 12 second outer surface fiber layer 2 second surface side outer surface fiber layer 3 connecting portion 31 first connecting portion 32 second connecting portion 39 end portion 4 of connecting portion Hollow part 41 first hollow part 42 second hollow part 41A, 42A air passage 5 first non-woven fabric layer 6 second non-woven fabric layer 7 recessed part 71 recessed part bottom part 10 non-woven fabric Z1 first surface side Z2 second surface side

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Textile Engineering (AREA)
  • Vascular Medicine (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Nonwoven Fabrics (AREA)
  • Absorbent Articles And Supports Therefor (AREA)

Abstract

La présente invention concerne un textile non-tissé (10) ayant des fibres thermoplastiques et ayant un premier côté de surface (Z1) et un second côté de surface (Z2). Le textile non-tissé présente : une couche de fibre externe (1) sur le premier côté de surface (Z1) ; une couche de fibre externe (2) sur le second côté de surface (Z2) ; une pluralité de sections de liaison (3) entre la couche de fibre externe (1) sur le premier côté de surface (Z1) et la couche de fibre externe (2) sur le second côté de surface (Z2) ; et des sections creuses (4) entre les sections de liaison (3). Les sections creuses (4) sont continues dans le sens plan du textile non-tissé (10).
PCT/JP2018/026728 2017-08-31 2018-07-17 Textile non-tissé WO2019044217A1 (fr)

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CN111032942A (zh) 2020-04-17

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