WO2007148533A1 - 多層不織布及び多層不織布の製造方法 - Google Patents
多層不織布及び多層不織布の製造方法 Download PDFInfo
- Publication number
- WO2007148533A1 WO2007148533A1 PCT/JP2007/061444 JP2007061444W WO2007148533A1 WO 2007148533 A1 WO2007148533 A1 WO 2007148533A1 JP 2007061444 W JP2007061444 W JP 2007061444W WO 2007148533 A1 WO2007148533 A1 WO 2007148533A1
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- Prior art keywords
- fiber
- fiber layer
- nonwoven fabric
- multilayer nonwoven
- multilayer
- Prior art date
Links
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Classifications
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-
- 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
- D04H13/00—Other non-woven fabrics
- D04H13/001—Making non-woven fabrics from staple fibres, filaments or yarns, bonded to at least one web-like material, e.g. woven, knitted non-woven fabric, paper, leather, during consolidation
- D04H13/007—Making non-woven fabrics from staple fibres, filaments or yarns, bonded to at least one web-like material, e.g. woven, knitted non-woven fabric, paper, leather, during consolidation strengthened or consolidated by welding together the various components
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
- Y10T428/2457—Parallel ribs and/or grooves
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
- Y10T428/24595—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness and varying density
- Y10T428/24603—Fiber containing component
Definitions
- Multilayer nonwoven fabric and method for producing multilayer nonwoven fabric are Multilayer nonwoven fabric and method for producing multilayer nonwoven fabric
- the present invention relates to a multilayer nonwoven fabric comprising a plurality of layers.
- non-woven fabrics are used in a wide range of fields such as sanitary products such as paper diapers and sanitary napkins, cleaning products such as wipers, and medical products such as masks.
- sanitary products such as paper diapers and sanitary napkins
- cleaning products such as wipers
- medical products such as masks.
- non-woven fabrics are used in various different fields, but when actually used in products in each field, they are manufactured to have properties and structures suitable for the use of each product. It is necessary.
- a surface sheet used for a skin contact surface of an absorbent article which includes a first fiber layer and a second fiber layer containing latent crimped fibers, Are laminated, and the first fiber layer and the second fiber layer are manufactured by heat-treating a multi-layer fiber partially heat-sealed at a plurality of positions.
- a multi-layered nonwoven fabric formed of is proposed.
- this multilayer nonwoven fabric a first fiber layer and a second fiber layer containing latent crimped fibers are stacked, and the first fiber layer and the second fiber layer are thermally fused at a plurality of positions.
- It is a multilayer nonwoven fabric produced by calo-heat treatment of the multilayer fiber that has been worn.
- the second fiber layer undergoes heat shrinkage, so that a slack portion is generated in the first fiber layer and a large number of convex portions are formed.
- the second fiber layer is thermally contracted in the horizontal direction (plane direction), the second fiber layer is reduced in size while maintaining the sheet-like shape, and the first fiber layer has a slack portion as described above.
- the convex portion forms a force only in the first fiber layer.
- the convex portion is easily crushed by pressure or the like. There is a problem that it will be.
- such a multilayer nonwoven fabric has a good initial tactile sensation, but the convexity can easily be crushed during use, which may increase the contact rate with the skin.
- the excrement or the like adheres to the skin.
- the present invention is a multilayer nonwoven fabric comprising a first fiber layer and a second fiber layer laminated on one surface side of the first fiber layer, the first fiber layer and the second fiber It is an object of the present invention to provide a multilayer nonwoven fabric adjusted so that the layer has a predetermined shape.
- a multilayer nonwoven fabric comprising a first fiber layer and a second fiber layer laminated and disposed on one surface side of the first fiber layer
- a plurality of grooves formed along a predetermined direction in a shape recessed in the thickness direction of the multilayer nonwoven fabric as viewed from the other surface of the first fiber layer, and the plurality of grooves formed in a shape protruding in the thickness direction A plurality of convex portions formed adjacent to each other and having a fiber basis weight higher than a fiber basis weight in a region constituting the bottom portion of the groove portion, and the bottom portions of the plurality of groove portions as viewed from the thickness direction.
- Each of the region and the plurality of convex portions is constituted by the first fiber layer and the second fiber layer,
- the surface on the first fiber layer side of the second fiber layer is the same side as the side on which the other surface of the first fiber layer protrudes.
- Multi-layered nonwoven fabric with a protruding shape is the same side as the side on which the other surface of the first fiber layer protrudes.
- the surface on the first fiber layer side of the second fiber layer is the same side as the side on which the other surface of the first fiber layer is recessed.
- each of the plurality of groove portions includes a plurality of low fiber basis weight portions formed at predetermined intervals on a bottom portion of the groove portion.
- Each of the plurality of low fiber basis weight portions is a region having a thickness smaller than an average thickness in the groove portion
- All or part of the plurality of low fiber basis weights is an opening (6) or (7
- All or a part of the plurality of convex portions is formed to extend in the first direction and has a shape that undulates when viewed from the thickness direction.
- the multilayer nonwoven fabric according to any one of (8).
- the first fiber layer is in a state in which the degree of freedom in the fibers constituting the first fiber layer is higher than the average degree of freedom in the fibers constituting the multilayer nonwoven fabric
- At least the first fiber layer is adjusted so that all or part of the bonding strength between the fibers constituting the first fiber layer is weakened or not bonded.
- At least the second fiber layer contains a three-dimensional crimped fiber (10) or (1
- the multilayer nonwoven fabric as described in 1).
- At least the second fiber layer includes
- the multilayer nonwoven fabric according to any one of (10) to (12), wherein the average fiber length in the fibers constituting the second fiber layer is shorter than the average fiber length of the fibers constituting the first fiber layer.
- At least the second fiber layer comprises:
- At least the second fiber layer includes
- At least the second fiber layer includes
- At least the second fiber layer is made of a composite fiber
- the composite fiber has a core part and a sheath part covering all or part of the core part and having a melting point lower than that of the core part and having a component force
- the multilayer nonwoven fabric according to any one of (14) to (16), wherein an inorganic content in the sheath is higher than an inorganic content in the core.
- the first fiber layer and the second fiber layer are composed of a composite fiber
- the composite fiber has a core part and a sheath part covering all or part of the core part and having a melting point lower than that of the core part and having a component force
- the mass of the core part with respect to the fiber mass in the second fiber layer is higher than the mass of the core part with respect to the fiber mass in the first fiber layer, and any one of (14) to (17) is described.
- Multilayer nonwoven fabric is described.
- a first fiber aggregate that is a fiber aggregate formed in a sheet shape and in which the fibers constituting the fiber aggregate have a degree of freedom, and one of the first fiber aggregates
- a multi-layer fiber assembly having a fiber assembly formed in a sheet-like shape and laminated on the surface side, and a second fiber assembly in which the fibers constituting the fiber assembly have a degree of freedom.
- the coalescence is disposed on a predetermined surface of the air-permeable support member, or predetermined fibers are laminated and disposed on the predetermined surface so as to form the multilayer fiber assembly, whereby the multi-layer fiber assembly is disposed on the air-permeable support member.
- the mainly gas-powered fluid sprayed on the multilayer fiber aggregate cannot be vented to the opposite side, and the fibers constituting the multilayer fiber aggregate can move to the opposite side of the breathable support member. And a non-ventilated part,
- Nonwoven fabric manufacturing method
- a predetermined low fiber basis weight is formed by spraying the fluid mainly having a gas force onto a region of the breathable support member of the multilayer fiber assembly that is supported by the non-venting portion (22). ) Or (23).
- (26) The method for producing a multilayer nonwoven fabric according to (24) or (25), wherein the low fiber basis weight is an opening.
- the present invention is a multilayer nonwoven fabric comprising a first fiber layer and a second fiber layer laminated and disposed on one surface side of the first fiber layer, wherein the first fiber layer and the second fiber A multilayer nonwoven fabric adjusted to have a predetermined shape can be provided.
- FIG. 1 is a perspective view of a multilayer fiber web.
- FIG. 2 is a perspective sectional view of the multilayer nonwoven fabric according to the first embodiment.
- FIG. 3A is a plan view of the multilayer nonwoven fabric according to the first embodiment.
- FIG. 3B is a bottom view of the multilayer nonwoven fabric according to the first embodiment.
- FIG. 4A is a plan view of a net-like support member.
- FIG. 4B is a perspective view of the net-like support member.
- FIG. 5 is a view showing a state in which the multilayer nonwoven fabric of FIG. 2 is manufactured by blowing a gas to the upper surface side of the multilayer fiber web of FIG. 1 with the lower surface side supported by the mesh support member of FIG. is there.
- FIG. 6 is a side view illustrating a multilayer nonwoven fabric manufacturing apparatus.
- FIG. 7 is a plan view for explaining a multilayer nonwoven fabric production apparatus.
- FIG. 8 is an enlarged perspective view of a region Z in FIG.
- FIG. 9 is a bottom view of the ejection part in FIG. 8.
- FIG. 10 is a perspective sectional view of the multilayer nonwoven fabric according to the second embodiment.
- FIG. 11 is a perspective sectional view of a multilayer nonwoven fabric according to a third embodiment.
- FIG. 12 is a perspective sectional view of the multilayer nonwoven fabric according to the fourth embodiment.
- FIG. 13A is a plan view of a multilayer nonwoven fabric according to a fourth embodiment.
- FIG. 13B is a bottom view of the multilayer nonwoven fabric according to the fourth embodiment.
- FIG. 14A is a plan view of a support member in which elongated members are arranged in parallel at regular intervals on a net-like support member.
- FIG. 14B is a perspective view of a support member in which elongated members are arranged in parallel at equal intervals on a net-like support member.
- 15 shows a state in which the multilayered nonwoven fabric of the fourth embodiment of FIG. 12 has been manufactured by blowing gas onto the upper surface side of the fiber web of FIG. 1 supported on the lower surface side by the support member of FIG. FIG.
- FIG. 16 is a perspective view of a net-like support member on which wavy undulations are formed.
- FIG. 17 is a view showing a state in which the multilayer nonwoven fabric of the fifth embodiment is manufactured by blowing a gas to the upper surface side in a state where the two-layer fiber web is supported on the lower surface side by the mesh support member of FIG. is there.
- FIG. 18 is a perspective sectional view of a multilayer nonwoven fabric according to a sixth embodiment.
- FIG. 19A is a plan view of a plate-like support member having a plurality of elliptical openings.
- FIG. 19B is a perspective view of a plate-like support member having a plurality of elliptical openings.
- FIG. 20 shows a state in which the multilayer nonwoven fabric according to the sixth embodiment is manufactured by blowing a gas on the upper surface side while the two-layer fiber web is supported on the plate-like support member in FIG. 19A or 19B on the lower surface side.
- FIG. 21 is a perspective view when the nonwoven fabric according to the present invention is used for a top sheet of a sanitary napkin.
- FIG. 22 is a perspective view when the nonwoven fabric according to the present invention is used for the top sheet of Ommut.
- FIG. 23 is a perspective view when the nonwoven fabric according to the present invention is used as an intermediate sheet of an absorbent article.
- FIG. 24 is a perspective view when the nonwoven fabric according to the present invention is used as an outer sheet of an absorbent article.
- FIG. 1 is a perspective view of a multilayer fiber web.
- FIG. 2 is a perspective sectional view of the multilayer nonwoven fabric of the first embodiment.
- FIG. 3A is a plan view of the multilayer nonwoven fabric according to the first embodiment.
- FIG. 3B is a bottom view of the multilayer nonwoven fabric according to the first embodiment.
- FIG. 4A is a plan view of the mesh support member.
- FIG. 4B is a perspective view of the mesh support member.
- Fig. 5 shows the multilayer fiber web shown in Fig. 1 with the lower surface supported by the mesh support member shown in Fig.
- FIG. 3 is a diagram showing a state in which the multilayer nonwoven fabric of FIG.
- FIG. 6 is a side view illustrating the multilayer nonwoven fabric manufacturing apparatus.
- FIG. 1 is a perspective view of a multilayer fiber web.
- FIG. 2 is a perspective sectional view of the multilayer nonwoven fabric of the first embodiment.
- FIG. 3A is a plan view of
- FIG. 7 is a plan view illustrating the multilayer nonwoven fabric manufacturing apparatus.
- FIG. 8 is an enlarged perspective view of a region Z in FIG.
- FIG. 9 is a bottom view of the ejection part in FIG.
- FIG. 10 is a perspective sectional view of the multilayer nonwoven fabric of the second embodiment.
- FIG. 11 is a perspective sectional view of the multilayer nonwoven fabric of the third embodiment.
- FIG. 12 is a perspective sectional view of the multilayer nonwoven fabric according to the fourth embodiment.
- FIG. 13A is a plan view of the multilayer nonwoven fabric of the fourth embodiment.
- FIG. 13B is a bottom view of the multilayer nonwoven fabric according to the fourth embodiment.
- FIG. 14A is a plan view of a support member in which elongated members are arranged in parallel at equal intervals on a net-like support member.
- FIG. 14B is a perspective view of a support member in which elongated members are arranged in parallel at equal intervals on a net-like support member.
- FIG. 15 shows a state in which the multi-layer nonwoven fabric of the fourth embodiment in FIG. 12 is manufactured by blowing gas on the upper surface side with the fiber web of FIG. 1 supported on the lower surface side by the support member of FIG.
- FIG. 16 is a perspective view of a net-like support member in which wavy undulations are formed.
- FIG. 17 shows a state in which the multilayer nonwoven fabric of the fifth embodiment is manufactured by blowing a gas to the upper surface side with the two-layer fiber web supported on the lower surface side by the mesh-like support member of FIG.
- FIG. 18 is a perspective sectional view of the multilayer nonwoven fabric according to the sixth embodiment.
- FIG. 19A is a plan view of a plate-like support member having a plurality of elliptical openings.
- FIG. 19B is a perspective view of a plate-like support member having a plurality of elliptical openings.
- FIG. 20 is a view showing a state in which the multilayer nonwoven fabric according to the sixth embodiment is manufactured by blowing gas on the upper surface side with the two-layer fiber web supported on the lower surface side by the plate-like support member in FIG. It is.
- FIG. 21 is a perspective view when the nonwoven fabric according to the present invention is used for the surface sheet of a sanitary napkin.
- FIG. 22 is a perspective view of the nonwoven fabric that is useful in the present invention for the Ommut surface sheet.
- FIG. 23 is a perspective view when the nonwoven fabric according to the present invention is used as an intermediate sheet of an absorbent article.
- FIG. 24 is a perspective view of the nonwoven fabric that is useful in the present invention as an outer sheet of an absorbent article.
- the multilayer nonwoven fabric 140 in the first embodiment includes the first fiber layer 141 and the first fiber layer 141.
- a multilayer nonwoven fabric comprising a second fiber layer 142 laminated on one surface side.
- MD machine flow direction
- the regions constituting the bottoms of the plurality of grooves 1 and the plurality of convex portions 2 as viewed in the thickness direction force are constituted by the first fiber layer 141 and the second fiber layer 142, respectively.
- the second fiber layer 142 constituting each of the plurality of convex portions 2 is such that the surface on the first fiber layer 141 side of the second fiber layer 142 is the side on which the other surface of the first fiber layer 141 protrudes.
- the shape protrudes on the same side.
- the second fiber layer 142 in the groove 1 has a shape in which the surface on the first fiber layer 141 side of the second fiber layer 142 is recessed on the same side as the other surface of the first fiber layer 141 is recessed. .
- the groove portions 1 are formed in parallel at substantially equal intervals when viewed from the width direction (CD) perpendicular to the longitudinal direction (MD), but the present invention is not limited thereto.
- it may be formed at different intervals or may be formed so that the interval between the groove portions 1 is not parallel but changes from the MD.
- the heights (thicknesses) of the plurality of convex portions 2 are not uniform and can be formed to have different heights.
- the multilayer nonwoven fabric 140 in the present embodiment is configured by laminating and arranging the first fiber layer 141 and the second fiber layer 142 as described above.
- the multilayer nonwoven fabric 140 is a nonwoven fabric in which a plurality of groove portions 1 are formed in parallel at substantially equal intervals on one surface side of the multilayer nonwoven fabric 140, specifically, on the first fiber layer 141 side.
- Each of the plurality of convex portions 2 is formed between each of the plurality of groove portions 1 formed at substantially equal intervals.
- the convex portions 2 are formed in parallel at substantially equal intervals like the groove portions 1.
- the groove portions 1 are formed in parallel at substantially equal intervals when viewed from the CD, but are not limited thereto, and may be formed at different intervals, for example. As described above, it is formed so that the interval between the groove portions 1 is not changed in parallel but viewed from the MD.
- the regions constituting the bottoms of the plurality of grooves 1 and the plurality of convex portions 2 are the first fiber layer 14
- the first and second fiber layers 142 are stacked and arranged.
- the second fiber layer 142 in the multilayer nonwoven fabric 140 has a shape corresponding to the shape of the plurality of grooves 1 and the like formed on the first fiber layer 141 side, which is not simply a sheet having a uniform thickness.
- the surface of the first fiber layer 141 opposite to the side on which the second fiber layer 142 is disposed constitutes the surface of the convex portion 2.
- This surface protrudes in a U-shape outside the multilayer nonwoven fabric 140 in the thickness direction (upward in the drawing).
- the surface on the second fiber layer 142 side of the first fiber layer 141 has a shape protruding in a U shape on the same side as the surface constituting the surface of the convex portion 2.
- the surface (bottom surface) of the second fiber layer 142 opposite to the first fiber layer 141 side and constituting the other surface of the multilayer nonwoven fabric 140 is formed in a planar shape.
- the surface of the second fiber layer 142 on the first fiber layer 141 side is deformed into a convex shape so as to follow the surface of the first fiber layer 141 on the second fiber layer 142 side. That is, the surface of the second fiber layer 142 on the first fiber layer 141 side protrudes on the same side as the surface of the first fiber layer 141 that protrudes in a U-shape.
- the thickness of the first fiber layer 141 in the region constituting the bottom of the groove 1 is thinner than the thickness of the first fiber layer 141 in the 2nd convex portion. Furthermore, the thickness of the first fiber layer 141 in the convex portion 2 is smaller than the thickness of the second fiber layer 142.
- the surface side surface of the first fiber layer 141 in the groove portion 1 has a shape that is recessed so as to be thinner in the thickness direction. Further, the surface on the first fiber layer 141 side of the second fiber layer 142 has a shape that is recessed on the same side as the surface on the surface side of the first fiber layer 141.
- the height (thickness direction) of the convex portions 2 of the multilayer nonwoven fabric 140 in the present embodiment is substantially uniform.
- the convex portions 2 adjacent to each other are formed to have different heights. May be.
- the height of the convex portion 2 can be adjusted by adjusting the interval between the ejection ports 913 from which a fluid mainly having a gas force, which will be described later, is ejected.
- the height of the convex portion 2 can be lowered by narrowing the interval between the ejection ports 913, and conversely, the height of the convex portion 2 can be increased by widening the interval between the ejection ports 913. Can do.
- the projections 2 having different heights can be alternately formed by narrowing the intervals between the ejection ports 913 and alternately forming the intervals and the wide intervals. And convex shapes with different heights like this When the multilayer nonwoven fabric in which the parts 2 are alternately formed is placed in contact with the body, the contact area with the skin is reduced compared to the case where the height is uniform, so the burden on the skin can be reduced. There are also benefits.
- the height of the convex portion 2 is preferably from 0.3 to 15 mm, particularly preferably from 0.5 to 5 mm. Further, it is preferable that the width of the convex portion 2 is 0.5 force or 30 mm, particularly 1.0 to 10 mm. It is preferable that the pitch between the vertices of the convex portions 2 adjacent to each other is 0.5 to 30 mm, particularly 3 to 1 Omm! /.
- the height (length in the thickness direction) of the second fiber layer 142 in the convex portion 2 is 95% or less of the height in the convex portion 2, particularly 20 to 90%, and even 40 To 70% is preferred.
- the height (length in the thickness direction) at the portion of the convex portion 2 is formed to be higher than the height of the portion constituting the bottom of the groove portion 1.
- the height (thickness) of the region constituting the bottom of the groove portion 1 is preferably 90% or less, particularly 1 to 50%, more preferably 5 to 20% of the height of the convex portion 2.
- the width of the groove 1 is preferably from 0.1 to 30 mm, particularly preferably from 0.5 to 10 mm.
- the distance between adjacent grooves 1 is preferably 0.5 mm and 20 mm, particularly 3 to 10 mm.
- the height of the second fiber layer (inner layer) 142 in the region constituting the bottom of groove 1 is 95% or less of the height (length in the thickness direction) in the region constituting the bottom of groove 1; In particular, 20 to 90%, more preferably 40 to 70% is preferable.
- measurement directions such as height, pitch, width, etc. in the regions constituting the bottoms of the convex portions 2 and the groove portions 1 are exemplified below.
- the multilayer nonwoven fabric 140 is placed on a table in a non-pressurized state, a cross section of the multilayer nonwoven fabric 140 is photographed with a microscope, and the cross-sectional photograph or cross-sectional image force is also measured.
- the multilayer nonwoven fabric 140 to be measured is cut along the width direction (CD) so as to pass through the apex of the convex portion 2 and the groove portion 1.
- the height of each of the regions constituting the convex portion 2 and the bottom of the groove portion 1 that are directed upward from the table surface is measured as the height.
- the pitch of the convex portion 2 is measured between the vertices that are the highest positions of the adjacent convex portions 2, and the pitch of the groove portion 1 is the center that is the central position of the adjacent groove portion 1.
- Measure between [0053] measure the maximum width of the bottom surface of the convex portion 2 from the lowest position (that is, the table surface) of the multilayer nonwoven fabric 140, and the maximum width of the bottom surface of the groove portion 1 in the same manner. Measure.
- examples of the cross-sectional shape of the convex portion 2 include a dome shape, a trapezoidal shape, a triangular shape, an ⁇ shape, and a square shape, and the shape is not particularly limited.
- the top surface and the side surface of the convex portion 2 are curved (curved surface) in consideration of the feel to the wearer.
- the shape of the groove portion 1 is such that the width decreases from the bottom surface to the top surface.
- the cross-sectional shape is a dome shape is preferable, and can be exemplified as the shape.
- the cross-sectional shape of the second fiber layer (inner layer) 142 in the convex portion 2 can be formed into a predetermined shape as described above for the shape, and is not particularly limited. In order to make it difficult for the intuition of the second fiber layer 142 to be transmitted to the wearer, it is preferable that the second fiber layer 142 has a dome-like curve (curved surface).
- the convex portion 2 can be crushed in the thickness direction.
- the fibers 101 constituting the first fiber layer 141 have a higher degree of freedom than the average degrees of freedom of the fibers 101 constituting the multilayer nonwoven fabric 140, and the average of the fibers 102 constituting the second fiber layer 142 is
- the degree of freedom can be made lower than the degree of freedom.
- the degree of freedom in the fibers 102 constituting the second fiber layer 142 can be adjusted to be higher than the degree of freedom in the fibers 101 constituting the first fiber layer 141.
- the average degree of freedom of the fiber is, for example, the average degree of freedom in the fiber 101 constituting the first fiber layer 141 and the fiber 102 constituting the second fiber layer 142.
- the intersection strength between the fibers 101 can be partially different.
- the first fiber layer 141 can be adjusted so that all or part of the intersections of the fibers constituting the first fiber layer 141 are weakened or not joined.
- a plurality of types of fibers having different melting points of the resin components on the surface of the fiber 101 can be blended.
- fiber A which is a core-sheath structure of low-density polyethylene (melting point 110 ° C) and polyethylene terephthalate
- fiber B which is a core-sheath structure of high-density polyethylene (melting point 135 ° C) and polyethylene terephthalate
- this fiber aggregate is heat-treated at 120 ° C. in an oven or the like, the fibers are thermally fused by the low-density polyethylene melted at the intersection of the fibers A in the fiber aggregate and at the intersection of the fibers A and B. To wear.
- the fusion strength at the intersection between the fibers A is stronger than the fusion strength at the intersection between the fibers A and B.
- the high-density polyethylene does not melt, so it does not heat-seal!
- heat fusion or the like is established because of the relationship of the strength of the intersection of the fibers A> the strength of the intersection of the fibers A and B> the strength of the intersection of the fibers B.
- the intersection strength between the fibers in the second fiber layer 142 is determined as the fiber intersection strength in the first fiber layer 141. It can be stronger.
- the fibers 101 constituting the first fiber layer 141 fibers longer than the average fiber length in the multilayer nonwoven fabric 140 can be used. Further, as the fiber 101 constituting the first fiber layer 141, a fiber in which the length of the fiber 101 is longer than the length of the fiber 102 constituting the second fiber layer 142 can be used. The longer the fiber length, the wider the distance between the fibers, and the more difficult the fibers collide with each other, so the degree of freedom between the fibers is high.
- the average fiber length in the multilayer nonwoven fabric 140 as the fibers 102 constituting the second fiber layer 142 Shorter fibers can be used. Further, as the fiber 102 constituting the second fiber layer 142, a fiber whose length is shorter than the length of the fiber 101 constituting the first fiber layer 141 can be used. The shorter the fiber length, the narrower the interfiber distance, and the higher the fiber density. Accordingly, since a density gradient can be provided in the convex portion 2, even if a small amount of menstrual blood or sweat adheres to the top of the convex portion 2, a liquid such as menstrual blood is applied to the second fiber layer 142. It can be suitably transferred.
- the second fiber layer 142 can contain a three-dimensional crimped fiber.
- the three-dimensional crimped shape include a spiral shape, a zigzag shape, and an ⁇ shape.
- the three-dimensional crimped shape is a spiral shape, for example, when the pressure is released from a state where pressure is applied, the second fiber layer is caused to return to the original shape by excessive external pressure. Even if 142 is slightly crushed, it is preferable because it is easy to return to its original thickness after the external pressure is released.
- Methods for providing a three-dimensional crimped shape to the fiber include shape imparting by mechanical crimping and shape imparting by thermal shrinkage.
- Mechanical crimping is applied to the continuous linear fibers after spinning while adjusting the peripheral speed difference 'heat' pressurization condition of the line speed.
- the number of crimps is selected from the range of 10 to 35 Zinch, and further 15 to 30 Zinch.
- a crimped shape is imparted by applying heat to a fiber composed of two or more fats having different melting points.
- a fiber designed to have a different heat shrinkage due to a difference in melting point is heated, and a three-dimensional crimp is expressed by the difference in heat shrinkage.
- the rosin composition that also considers the fiber cross-sectional force include an eccentric type with a core-sheath structure and a side-by-side type in which the melting points of the left and right components are different.
- the heat shrinkage rate of such fibers is preferably in the range of 5 to 90%, more preferably 10 to 80%.
- the method for measuring the heat shrinkage rate is as follows. (1) 20% at 100% fiber Create an OgZm 2 fiber web, (2) cut the fiber web to a size of 250 x 250 mm, and (3) leave the cut sample in a 145 ° C oven for 5 minutes and heat-treat, (4) The length dimension of the sample after heat shrinkage by this heat treatment is measured, and (5) the heat shrinkage rate is calculated from the difference in length dimension before and after heat shrinkage.
- the content of the three-dimensional crimped fiber in the second fiber layer 142 is, for example, preferably 30% by mass or more, and particularly preferably 50% by mass or more. In the case where the content of the three-dimensional crimped fiber is 30% by mass or more, it is preferable because the second fiber layer 142 can easily obtain the compression maintenance property and the compression recovery property.
- the first fiber layer 141 can also contain three-dimensional crimped fibers.
- the content of the three-dimensional crimped fiber in the first fiber layer 141 is, for example, 70% by mass or less, and particularly preferably 50% by mass or less.
- the fiber density in the first fiber layer 141 can be lowered. In this case, the transferability of the liquid from the first fiber layer 141 to the second fiber layer 142 becomes good, which is preferable.
- the sense of foreign matter caused by the contact of the end face (cut) of the three-dimensional crimped fiber with the skin is suppressed. be able to.
- the fiber 102 constituting the second fiber layer 142 a fiber having a higher Young's modulus than the fiber 101 constituting the first fiber layer 141 can be used.
- the average Young's modulus of the fibers 102 constituting the second fiber layer 142 can be adjusted to be higher than the average Young's modulus of the fibers 101 constituting the first fiber layer 141.
- a fiber having a high Young's modulus used as the fiber 102 constituting the second fiber layer 142 a fiber having a high fiber degree can be used.
- a fiber having a fiber degree larger than the fiber degree of the fiber 101 constituting the first fiber layer 141 can be used.
- the fiber 102 constituting the second fiber layer 142 for example, a fiber with a low content of inorganic substance can be used.
- a fiber having a smaller inorganic content than the fiber 101 constituting the first fiber layer 141 can be used.
- inorganic substances include inorganic fillers such as titanium oxide.
- a fiber that obtains a whitening property because the Young's modulus decreases even if it contains an inorganic substance it is made of a composite fiber, and the core part and all or part of the core part are formed.
- a sheath portion that has a component power that is lower than the core portion and has a melting point lower than that of the core portion, and the inorganic content in the sheath portion is higher than the inorganic content in the core portion.
- the second fiber layer The fiber 101 constituting 142 is a fiber in which the inorganic content in the sheath is higher than the inorganic content in the core.
- the fibers 102 constituting the second fiber layer 142 fibers in which the mass of the core part relative to the fiber mass in the second fiber layer is higher than the mass of the core part relative to the fiber mass in the first fiber layer can be used. . That is, in the so-called core-sheath mass ratio, the fiber used for the second fiber layer has a higher core mass. By using such a fiber, the fiber stiffness can be maintained due to the high mass ratio of the core even after heat sealing.
- the second fiber layer 142 can be formed by an airlaid method using fibers having a fiber length shorter than that of the fibers constituting the first fiber layer 141.
- the second fiber layer 142 is formed by stacking the fibers 102 having a short fiber length to a predetermined thickness, it can be suitably performed by the airlaid method.
- the fiber orientation tends to be oriented in the thickness direction of the fiber layer. Since liquids such as menstrual blood migrate along the fiber orientation, for example, the second fiber layer (inner layer) 142 is laminated by the airlaid method so that the fiber orientation is oriented in the thickness direction. In this case, it is possible to prevent liquid such as menstrual blood that has migrated to the second fiber layer (inner layer) 142 from diffusing in the planar direction on the surface of the multilayer nonwoven fabric 140. Further, since the fiber orientation of the second fiber layer (inner layer) 142 is oriented in the thickness direction, the buckling strength is improved, and the convex portion is crushed even when external pressure is applied.
- the fibers 101 arranged in the region constituting the bottom of the groove 1 are oriented in a direction intersecting the longitudinal direction of the groove 1, specifically, in a substantially width direction.
- the fibers 101 in the first fiber layer 1 41 and the fibers 102 in the second fiber layer 142 are generally aligned in the width direction (lateral Orientation).
- the orientation of the fibers 101 in the first fiber layer 141 and the orientation of the fibers 102 in the second fiber layer 142 can be adjusted.
- the ratio of the fibers 101 oriented in the width direction in the first fiber layer 141 may be adjusted so that the ratio of the fibers 102 oriented in the width direction in the second fiber layer 142 is different.
- the side fibers in the convex portion 2 are oriented in a direction along the longitudinal direction (MD) of the convex portion 2. For example, it is oriented in the longitudinal direction as compared to the fiber orientation in the central part of the convex part 2 (region between both side parts).
- the region constituting the bottom of the groove portion 1 is adjusted so that the fiber density is lower than that of the convex portion 2.
- the fiber density in the region constituting the bottom of the groove 1 can be arbitrarily adjusted mainly by various conditions such as the amount of fluid (for example, hot air) and tension.
- the fiber density of the side portion in the convex portion 2 can be arbitrarily adjusted depending on various conditions such as the amount of fluid (eg, hot air) mainly acting as a gas force and tension.
- the amount of fluid eg, hot air
- the fiber density of the side portion in the convex portion 2 can be arbitrarily adjusted depending on various conditions such as the amount of fluid (eg, hot air) mainly acting as a gas force and tension.
- the region constituting the bottom of the groove 1 is adjusted so that the fiber basis weight of the fiber 101 is smaller than that of the convex portion 2. Further, the fiber basis weight of the region constituting the bottom portion of the groove portion 1 is adjusted to be lower than the average of the fiber basis weight in the whole including the region constituting the bottom portion of the groove portion 1 and the convex portion 2.
- the fiber basis weight of the entire multilayer nonwoven fabric 140 is preferably 10 forces to 200 gZm 2 , particularly 20 forces to lOOgZm 2 .
- the fiber basis weight of the entire multilayer nonwoven fabric 140 is less than lOgZm 2 , it is easily damaged during use. If it is more than 200 g / m 2 , the liquid may not be smoothly transferred to the opposite side of the body.
- the fiber basis weight in the region constituting the bottom of the groove 1 is the fiber in the convex portion 2.
- V preferably 90% or less, especially 3 to 90%, more preferably 30 to 70%.
- the strength of the multilayer nonwoven fabric 140 becomes weak and may not be suitable for a predetermined use.
- the multilayer nonwoven fabric 140 when used as a surface sheet in an absorbent product such as a sanitary napkin, it may be damaged during use.
- the fiber basis weight in the convex portion 2 is, for example, preferably 15 to 250 gZm 2 , particularly preferably 25 to 120 gZm 2 .
- the fiber density in the raised ridge portion 2 is 0. 20 g / cm 3 or less, particularly 0.0 05 forces et 0. 20 g / cm 3, further ⁇ or 0.007 Power et 0. 07g / cm 3 power ⁇ good It's better!
- the fiber basis weight in the convex part 2 is less than 15 gZm 2 or the density is lower than 0.005 g / cm 3 , the convex part 2 is liable to be crushed by the weight of liquid such as menstrual blood or external pressure. There is a case. Furthermore, once absorbed menstrual blood may be easily returned under pressure.
- the fiber basis weight of the convex portion 2 is more than 250 g / m 2 or the density is higher than 0.20 g / cm 3 , menstrual blood excreted in the convex portion 2 moves downward. However, it may become trapped in the convex part 2.
- the fiber basis weight in the region constituting the bottom of the groove 1 is preferably, for example, 3 to 150 gZm 2 , particularly 5 to 80 gZm 2 . Further, the density in the region constituting the bottom of the groove 1 is not more than 0.18 g / cm 3 , particularly 0.002 force, etc., 0.18 g / cm 3 , and even 0.005 force, 0.005 g / cm 3 . 3 is preferred.
- the multilayer nonwoven fabric 140 is a sanitary napkin or the like. If it is placed as a top sheet of an absorbent article, it may be easily damaged during use.
- the fiber basis weight ratio between the first fiber layer 141 and the second fiber layer 142 is preferably in the range of 10:90 force to 90:10, particularly in the range of 20:80 to 50:50.
- the fiber basis weight in the first fiber layer 141 is less than 10% of the fiber basis weight of the multilayer nonwoven fabric 140, it may be on the skin. There is a risk of rubbing and rashing due to its high frictional resistance.
- the fiber basis weight in the first fiber layer 141 is more than 90% with respect to the fiber basis weight of the multilayer nonwoven fabric 140, the convex portion 2 may be easily crushed due to the weight of menstrual blood or external pressure.
- the groove portion 1 and the convex portion 2 satisfy the above-described conditions, for example, even when a large amount of menstrual blood is excreted in the multilayer nonwoven fabric 140 or when a highly viscous menstrual force S is excreted, menstrual blood is not It is possible to suppress diffusion on the surface. For example, even if external pressure in the thickness direction is applied to the multilayer nonwoven fabric 140 and the convex part 2 is slightly crushed, the space in the groove part 1 (valley) is easily retained. Even if it is applied, it may be possible to suppress wide diffusion to the surface. Furthermore, even if once absorbed menstrual blood or the like is reversed under external pressure, it can be prevented from re-adhering to the skin widely because the contact area with the skin is small.
- the region constituting the bottom of the groove 1 transmits liquid, and the convex portion 2 has a porous structure. It's hard to hold liquid, so it's preferred.
- the region constituting the bottom of the groove 1 has a low fiber density and a small fiber basis weight, and is therefore suitable for allowing liquid to permeate. Furthermore, since the fibers at the bottom of the groove 1 are oriented in the width direction (lateral direction, CD), it is possible to prevent the liquid from flowing too much in the longitudinal direction (MD) of the groove 1 and spreading over a wide range.
- the area constituting the bottom of the groove 1 is oriented in the width direction of the groove 1 (orientated in the CD) even though the fiber basis weight is low, so the strength in the width direction of the multilayer nonwoven fabric 140 (strength against CD) ) Is growing.
- the multilayer nonwoven fabric 140 in the present embodiment is preferably a through-air nonwoven fabric.
- a method for manufacturing the multilayer nonwoven fabric 140 according to this embodiment will be described with reference to FIGS.
- a fiber assembly formed in a sheet shape, in which the fibers constituting the fiber assembly have a degree of freedom, a first fiber assembly (not shown) and one of the first fiber assemblies A multilayer fiber assembly having a fiber assembly formed in a substantially sheet shape laminated on the surface side, and a second fiber assembly in which the fibers constituting the fiber assembly have a degree of freedom.
- the fiber web 100 is placed on the upper surface side of the net-like support member 210 which is a breathable support member. In other words, the fiber web 100 is supported from below by the mesh support member 210.
- predetermined fibers may be laminated on a predetermined surface of the net-like support member 210 so as to form the above-described multilayer fiber assembly.
- the state in which the fibers in the fiber assembly have a degree of freedom means that at least a part of the fibers constituting the fiber assembly is in a free state.
- the state having a degree of freedom means a state in which at least a part of the fibers constituting the fiber assembly can change its position and Z or orientation.
- the state having a degree of freedom means a state in which at least a part of the fibers constituting the fiber assembly is movable.
- the net-like support member 210 in a state where the fiber web 100 is supported is moved in a predetermined direction, and the upper surface side force of the fiber web that is moved is continuously sprayed with the gas.
- a multilayer nonwoven 140 in the form can be produced.
- the net-like support member 210 is manufactured such that a plurality of wires 211 having a predetermined thickness, which are impermeable portions, are woven. A plurality of wires 211 are woven at predetermined intervals to obtain a net-like support member in which a plurality of hole portions 233 that are ventilation portions are formed.
- the mesh-like support member 210 in FIG. 4A or FIG. 4B is formed by forming a plurality of holes 233 having a small hole diameter, and is a gas blown from the upper surface side of the fiber web.
- the gas ventilated through the fiber web is vented downward (on the side opposite to the side where the fiber web is disposed) without being obstructed by the mesh-like support member 210.
- the net-like support member 210 does not greatly change the flow of the gas to be blown, and the fiber 101 is made to be in the net-like support part. Do not move material 210 down! /.
- the fibers 101 and 102 in the fiber web 100 are moved in a predetermined direction mainly by gas blown from the upper surface side. Specifically, since the downward movement of the mesh support member 210 is restricted, the fibers 101 and 102 move in a direction along the surface of the mesh support member 210.
- the fibers 101 and 102 in the region where the gas is blown are moved to a region adjacent to this region.
- the region where the fibers 101 and 102 are moved is formed along the machine flow direction (MD). .
- the fibers 101 and 102 are moved to the side of the area where the gas is blown.
- the fibers 101 and 102 that have been oriented mainly in the machine flow direction (MD) are moved laterally to form the groove 1. Then, the fibers 101 and 102 oriented in the direction (CD) perpendicular to the machine flow direction (MD) remain at the bottom of the groove 1. Further, a convex portion 2 is formed on the side of the groove portion 1, in other words, between the groove portion 1 and the groove portion 1 adjacent thereto.
- the side part of the convex part 2 formed by moving the fibers 101 and 102 oriented in the MD direction from the region where the groove part 1 was formed has a high fiber density and the fiber 101 and 102 Of 102, the proportion of fibers 101 and 102 oriented in the longitudinal direction increases.
- the nonwoven fabric manufacturing apparatus 90 in this embodiment is a multilayer fiber assembly formed in a sheet shape, and the fibers constituting the fiber assembly have a degree of freedom.
- a non-woven fabric in which one or more of fiber orientation, fiber density, or fiber basis weight is adjusted is produced by spraying a fluid mainly having a gas force onto a fiber web 100 as a certain fiber aggregate.
- the nonwoven fabric manufacturing apparatus 90 is a fiber that is a multilayer fiber assembly formed in a sheet shape and in which the fibers constituting the fiber assembly have a degree of freedom.
- a multilayer nonwoven fabric 140 is manufactured by spraying a fluid that mainly has a gas force on the web 100.
- the non-woven fabric manufacturing apparatus 90 includes a breathable support unit that supports the fiber web 100 from one side.
- a jet forming a jetting means for jetting a fluid mainly having a gas force from the other side of the fiber web 100 to the material 200 and the fiber web 100 supported from one side by the breathable support member 200
- a section 910 and an air supply section (not shown)
- a conveyor 930 which is a moving means for moving the fiber web 100 in a predetermined direction F.
- the conveyor 930 moves the fiber web 100 in a state of being supported from one surface side by the air-permeable support member 200 in a predetermined direction F, and the ejection unit 910 and the air supply unit (not shown) A fluid mainly composed of a gas force is sprayed on the other side of the fiber web 100 moved in the predetermined direction F by 930.
- the fibers 101 and 102 constituting the fiber web 100 are ejected (sprayed) mainly from the ejection portion 910, and the fluid which is mainly a gas force, and Z or the ejection portion 910 force is ejected.
- the fibers 101 and 102 constituting the fiber web 100 are moved.
- the moving amount of the fiber 101 the fiber orientation, fiber density, or fiber basis weight in the fiber web 100 is adjusted, and a plurality of groove portions 1 and convex portions 2 are formed.
- the multilayer nonwoven fabric manufacturing apparatus 90 forms the groove portion 1 in the multilayer nonwoven fabric 140 of the present embodiment, but is not limited thereto, and forms a plurality of openings 3 to be described later depending on the shape of the air-permeable support member. Can do. In other words, depending on the fiber orientation to be adjusted, fiber density or fiber basis weight, and the shape of the predetermined groove or opening to be formed, the shape and arrangement of the air-permeable portion and the air-impermeable portion in the air-permeable support member described later are determined. By designing, the desired nonwoven fabric can be produced.
- the position and Z or orientation of the fibers 101 and 102 constituting the fiber web 100 can be changed by changing the spraying condition of the fluid mainly made of gas force.
- the degree of change (movement amount, etc.) can be adjusted.
- the fiber orientation, fiber density, or fiber basis weight of the nonwoven fabric can be adjusted by adjusting the spraying conditions of the fluid that mainly has gas force.
- the shape of the groove, opening, or protrusion can be adjusted.
- the multilayer nonwoven fabric 150 has a shape similar to that of the multilayer nonwoven fabric 140 in the first embodiment, and the back surface of the second fiber layer 142 projects to the same side as the side from which the first fiber layer 141 projects. It differs in that it is deformed. That is, the difference is that the back surface side of the multilayer nonwoven fabric 150 of the convex portion 2 is deformed so as to protrude to the front surface side of the multilayer nonwoven fabric 150 of the convex portion 2.
- the surface of the second fiber layer 142 constituting the convex portion 2 on the side opposite to the first fiber layer 141 side is the side on which the surface of the first fiber layer 141 opposite to the second fiber layer 142 side protrudes.
- the shape is deformed so that it protrudes to the same side.
- the multilayer nonwoven fabric 150 has a corrugated surface and back surface in the thickness direction when viewed from the width direction (CD) intersecting the longitudinal direction (MD) formed so that the groove portion 1 and the convex portion 2 extend. Is formed.
- a multilayer nonwoven fabric 160 in the third embodiment will be described with reference to FIG.
- the multilayer nonwoven fabric 160 is a multilayer nonwoven fabric in which the third fiber layer 143 is further arranged on the back surface of the second fiber layer 142 in the multilayer nonwoven fabric 140 of the first embodiment. That is, it is a multilayer nonwoven fabric in which the third fiber layer 144 is further arranged on the surface of the second nonwoven fabric 140 of the first embodiment opposite to the first fiber layer 141 side of the second fiber layer 142.
- the third fiber layer 143 By further disposing the third fiber layer 143, a predetermined function, strength, and the like can be imparted. For example, by disposing the third fiber layer 143, it is possible to improve shape maintenance properties, cushioning properties, and the like.
- the multilayer nonwoven fabric 170 is a multilayer nonwoven fabric in which a plurality of openings 3 that are low-fiber basis weight portions are formed at predetermined intervals on the bottom surface of the groove portion 1 of the multilayer nonwoven fabric 140 in the first embodiment.
- the multilayer nonwoven fabric 170 a plurality of openings, which are low-fiber basis weights, are formed on the bottom surface of the groove portion 1.
- the low fiber weight portion may be, for example, a hollow portion formed so that the thickness of the multilayer nonwoven fabric 170 in the groove portion 1 is reduced! /.
- the bottom surface of the groove 1 has a shape in which a height difference is formed along the direction (MD) in which the groove 1 is formed.
- the multilayer nonwoven fabric 170 in this embodiment is a multilayer nonwoven fabric in which a plurality of openings 3 are formed as described above.
- the multi-layer nonwoven fabric 170 includes a plurality of groove portions 1 formed along the machine flow direction (MD) on one surface side of the multi-layer nonwoven fabric 170 and formed in parallel at substantially equal intervals when viewed from the CD.
- 1 is a multilayer nonwoven fabric in which a plurality of openings 3 are formed along the bottom surface of 1.
- Each of the plurality of openings 3 is formed in a substantially circular shape or a substantially elliptical shape with respect to the upper surface force.
- the groove portions 1 are formed in parallel in the MD direction at substantially equal intervals.
- it may be formed at different intervals, or may be formed so that the interval between the groove portions 1 is not parallel but changes.
- the heights of the convex portions 2 can be formed to be not uniform but different from each other.
- a connecting portion 4 formed so as to connect the protruding portion 2 and the protruding portion 2 adjacent thereto is formed.
- the fibers 101 and 102 in the connecting rod are in the direction crossing the longitudinal direction (machine flow direction; MD), specifically in the longitudinal direction.
- the fiber 101 is moved to the side of the convex portion 2 by blowing a fluid (for example, hot air) mainly having gas force, and is directed in the width direction (direction perpendicular to the machine flow direction; CD).
- a fluid for example, hot air
- CD width direction
- Most of the fibers 101 arranged at the bottom of the groove 1 due to the remaining fibers are directed in the width direction (CD).
- the fibers 101 and 102 arranged on the side portions of the convex portion 2 are mainly oriented in the longitudinal direction (MD) of the convex portion 2. That is, the fibers 101 and 102 arranged on the side of the convex portion 2 are oriented so as to face the longitudinal direction (MD).
- the fibers arranged on the side of the convex part 2 are the fibers 101 and 102 arranged in the central part (region between both side parts) of the convex part 2 and oriented in the longitudinal direction. Compared with the ratio of the fibers 101 and 102, the ratio of the fibers 101 and 102 arranged on the side of the convex portion 2 and facing the longitudinal direction is higher. Orient.
- the fibers 101 and 102 around the opening 3 are oriented along the circumferential direction of the opening 3.
- the fibers 101 and 102 arranged near both ends viewed from the longitudinal direction (MD) of the groove 1 in the opening 3 are oriented in a direction intersecting the longitudinal direction (MD).
- both end portions of the opening 3 viewed from the width direction (CD) are oriented in the longitudinal direction (MD).
- fibers 101 and 102 that are directed in the longitudinal direction (MD) are moved to the side of the convex portion 2 by blowing hot air or the like.
- the number of fibers 101 oriented in the longitudinal direction arranged on the side of the convex portion 2 increases.
- the fiber density of the connecting part 4 constituting the bottom part of the groove part 1 is adjusted according to the size of the opening part 3.
- the region constituting the bottom of the groove portion 1 is adjusted so that the fiber basis weight of the fibers 101 and 102 is less than that of the convex portion 2. Further, the fiber basis weight of the region constituting the bottom of the groove portion 1 is adjusted to be lower than the average fiber basis weight including the groove portion 1 and the convex portion 2.
- the convex portion 2 is adjusted so that the fiber basis weight of the fibers 101 and 102 is larger than the region constituting the bottom of the groove portion 1.
- the fiber basis weight of the region constituting the bottom of the groove portion 1 is adjusted to be lower than the average fiber basis weight including the groove portion 1 and the convex portion 2.
- the bottom of the groove part 1 allows the liquid to pass therethrough, and the convex part 2 has a porous structure, so that it is difficult to hold the liquid. Play. Furthermore, the opening 3 formed in the groove 1 is solidified in addition to the liquid. It can penetrate the body.
- the liquid and the solid are suitably permeated. Furthermore, since a large proportion of the fibers 101, 102 of the fibers 101, 102 arranged at the bottom of the groove 1 (connecting part 4) are oriented in the width direction, the liquid dropped into the groove 1 Can be prevented from flowing in the longitudinal direction of the groove 1 and moving to a wide range. Further, since the fibers 101 and 102 arranged at the bottom of the groove 1 are oriented so as to face the width direction (direction perpendicular to the machine flow direction at the time of manufacture; CD), the bottom of the groove 1 (the connecting portion 4). ) Has a high strength in the width direction (CD) (CD strength) despite its low fiber texture.
- the fiber web 100 is placed on the upper surface side of the support member 220 of FIG. 14A or 14B, which is a breathable support member. In other words, the fiber web 100 is also supported by the support member 220 with a lower force.
- the support member 220 in a state where the fiber web 100 is supported is moved in the (machine flow direction; MD).
- the multilayer nonwoven fabric 170 in this embodiment can be manufactured by continuously blowing gas on the upper surface side force of the moved fiber web 100.
- the support member 220 is disposed on the conveyor in such a manner that the elongated member 225 is disposed along a direction (CD) orthogonal to the machine flow direction (MD).
- the support member 220 on which the fiber web 100 is placed on the upper surface side is moved in the machine flow direction.
- gas is continuously blown onto the upper surface side of the fiber web 100 in a direction substantially orthogonal to the direction in which the elongated member 225 extends. That is, the groove portion 1 is formed along the machine flow direction (MD), in other words, the direction substantially perpendicular to the direction in which the elongated member 225 extends.
- the support member 220 is a support member in which a plurality of elongated members 225 are arranged substantially in parallel at predetermined intervals on the upper surface of the net-like support member 210 in FIG. 4A or 4B.
- the elongate member 225 is an air-impermeable member and does not allow the gas blown from the upper side (one side) to be vented to the lower side (the other side). In other words, the flow direction of the gas blown to the elongated member 225 is changed.
- the elongated member 225 does not move the fibers 101 and 102 constituting the fiber tube 100 from the upper side (one side) to the lower side (the other side) of the support member 220! /.
- the movement of the fibers 101 and 102 constituting the fiber tube 100 flows through the elongated member 225 by ventilating the gas and Z or the fiber web 100 sprayed from the upper surface side of the fiber tube 100. It is moved by the gas whose direction is changed.
- the fibers 101 and 102 arranged in the region where the gas is blown are moved to a region adjacent to the region. Specifically, the fibers 101, 102 oriented in the longitudinal direction (machine flow direction (MD)) are moved in a direction (CD, width direction) orthogonal to the machine flow direction.
- MD machine flow direction
- the groove 1 is formed.
- the fibers 101 and 102 that remain without being moved are oriented in the width direction (CD) and constitute the bottom of the groove 1. That is, the fibers 101 and 102 constituting the bottom of the groove 1 are oriented in the width direction (CD).
- a convex portion 2 is formed between the groove portion 1 and the groove portion 1 adjacent thereto.
- the side portion of the convex portion 2 has a higher fiber density due to the above-mentioned moved fibers 101 and 102, and faces the longitudinal direction (MD) of the fibers 101 and 102 constituting the side portion.
- MD longitudinal direction
- the net-like support member 210 and the elongated member 225 constituting the support member 220 regulate the movement of the fiber 101 to the lower surface side opposite to the side where the fiber web 100 of the support member 220 is disposed. Therefore, the fibers 101 and 102 are moved in a direction along the upper surface, which is the surface on which the fiber web 100 of the support member 220 is placed.
- the gas sprayed onto the elongated member 225 flows along the surface of the elongated member 225 with its flow changed.
- the gas whose flow is changed in this way is an elongated member.
- the fibers 101 arranged on the upper surface of 225 also move the upper surface force of the elongated member 225 to the surrounding area. Thereby, the opening 3 having a predetermined shape is formed, and one or more of the orientation, density, or fiber basis weight of the fibers 101 and 102 are adjusted.
- the temperature, amount, or strength of the fluid that is mainly gas force sprayed on the fiber web 100 is adjusted, and the moving speed of the fiber web 100 in the moving means is adjusted to adjust the tension and the like.
- the supporting member 230 shown in FIG. 19A or 19B is used, the multilayer nonwoven fabric 170 in the present embodiment can be obtained.
- the multilayer nonwoven fabric 170 in the present embodiment can be manufactured by the multilayer nonwoven fabric manufacturing apparatus 90.
- the description in the explanation of the production method of the multilayer nonwoven fabric 170 and the multilayer nonwoven fabric production apparatus 90 described above can be referred to.
- a multilayer nonwoven fabric 140A according to the fifth embodiment will be described with reference to FIG.
- the multilayer nonwoven fabric 140 in the first embodiment is waved by applying a force in the machine flow direction (MD, longitudinal direction) in which the groove portion 1 and the convex portion 2 are formed in the multilayer nonwoven fabric 140.
- the (inner side surface) forms a wave shape
- the surface (inner side surface) on the first fiber layer 141 side of the second fiber layer 142 forms a wave shape
- the multilayer nonwoven fabric 140A is manufactured using a net-like support member 210A provided with wave-like undulations in the direction of arrow G shown in FIG. That is, by using the net-like support member 210A provided with the wavy undulations shown in FIG. 16 as the air-permeable support member, the multilayer nonwoven fabric 140A is formed so as to follow the net-like support member 210A as a whole. It is formed.
- the convex portion 2 is formed in a wave shape in the arrow G direction (MD). A predetermined portion of the fiber web 100 constituting the convex portion 2 is deformed so as to follow the shape of the net-like support member 210A, thereby providing a wavy undulation.
- the groove 1 is formed in a wave shape in the arrow G direction (MD). A predetermined portion of the fiber web 100 constituting the groove portion 1 is deformed so as to follow the shape of the net-like support member 210A, thereby providing a wavy undulation.
- This wave-like undulation pattern can be designed as appropriate.
- the machine flow direction (MD) arrow G direction force
- the wave-like undulation pitch is 30 mm, especially 3 to 10 mm.
- the case where the undulation height difference is 0.5 to 20 mm, particularly 3 to 10 mm can be exemplified.
- the undulation shape in the net-like support member 210 for example, a zigzag shape having a triangular or quadrangular cross section can be exemplified.
- the multilayer nonwoven fabric 140A has a force formed so as to undulate along the direction in which the groove 1 and the like in the machine flow direction (MD) are formed (direction in which the groove 1 extends). Not limited. For example, a wavy undulation that is not related to the direction in which the groove 1 or the like is formed can be formed.
- the multilayer nonwoven fabric 170A is a multilayer nonwoven fabric in which the multilayer nonwoven fabric 170 according to the fourth embodiment is formed in a wave shape with a view of the longitudinal direction (MD) force in which the groove portion 1 and the convex portion 2 are formed in the multilayer nonwoven fabric 170. is there.
- the multilayer nonwoven fabric has a plurality of openings 3 continuously formed at predetermined intervals along the bottom in the region constituting the bottom of the groove 1 of the multilayer nonwoven fabric 140A.
- the description in the multilayer nonwoven fabric 140A of the fifth embodiment described above can be used.
- the multilayer nonwoven fabric 170A is manufactured by using a plate-like support member 230 in which holes 233 and plate portions 235 are alternately and continuously formed in the direction of arrow G. That is, in the state of being supported by the plate-like support member 230 in the direction of the arrow G while spraying a fluid mainly gas from the surface side opposite to the side supported by the plate-like support member 230 in the multilayer nonwoven fabric 170A.
- the fibers arranged on the upper surface side of the hole 233 move so as to enter the hole 233, thereby providing a wavy undulation.
- the multilayer nonwoven fabric 170A is formed so as to follow the wavy undulations in the net-like support member 210A as a whole.
- a wave-like undulation is provided by also seeing the force in the arrow G direction, which is the machine flow direction (MD).
- the fiber configurations in the first fiber layer and the second fiber layer in the above-described embodiment will be exemplified below.
- the first fiber layer low density polyethylene (melting point 110 ° C) and polyethylene terephthalate core-sheath structure, average fineness 3.3dtex, average fiber length 51mm, hydrophilic oil coated fiber A and high density polyethylene (melting point) 135 ° C) and a polyethylene terephthalate core-sheath structure having an average fineness of 3.3 dtex, an average fiber length of 51 mm, and a fiber layer coated with a water-repellent oil agent.
- Fiber A and Fiber B are contained in a mixing ratio of 70:30, and the fiber basis weight is adjusted to 15 g / m 2 .
- An example of the second fiber layer is 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 100% fiber coated with a hydrophilic oil agent.
- Fiber basis weight in the fiber layer is 25gZm 2.
- the first fiber layer has a core-sheath structure of high-density polyethylene (melting point: 135 ° C) and polyethylene terephthalate, with an average fineness of 2.2 dtex, an average fiber length of 51 mm, and a titanium oxide core.
- the second fiber layer has an eccentric core / sheath structure of high-density polyethylene and polyethylene terephthalate, with an average fineness of 5.6 dtex, an average fiber length of 51 mm, and 1% by mass of titanium oxide with respect to the weight of the core.
- a fiber layer containing fiber D coated with a mixed and hydrophilic oil agent can be exemplified. Fibers C and the fiber D in the fiber layer 50: a mixing ratio of 50, the fiber basis weight is 20gZm 2.
- the second fiber layer is a fiber assembly by an airlaid method
- the third fiber layer is a fiber assembly by a card method. Examples of the fiber configuration of each fiber layer are given below.
- the first fiber layer it has a core-sheath structure of high-density polyethylene and polyethylene terephthalate polypropylene, with an average fineness of 3.3 dtex, an average fiber length of 51 mm, and 1 mass% Z of titanium oxide in the core relative to the mass of each core-sheath. mixed 2 wt% to sheath 100% fibers hydrophilic oil-coated, the fiber layer formed by the card method so that the fiber basis weight becomes 15GZm 2 can examples shown.
- the second fiber layer has a core-sheath structure of high-density polyethylene and polyethylene terephthalate, with an average fineness of 5.6 dtex, an average fiber length of 4 mm, and 1% by mass of titanium oxide based on the weight of the core.
- An example is a fiber layer that is made of 100% coated fiber and is laminated by the airlaid method so that the fiber basis weight is 20 g Zm 2 .
- the third fiber layer has a core-sheath structure of high-density polyethylene and polypropylene, with an average fineness of 2.
- Fibers A and B is 70: contained 30 mixing ratio, fiber basis weight is adjusted to 15gZm 2.
- 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 100% fiber coated with a hydrophilic oil agent is used.
- Fiber basis weight in the fiber layer is 25gZm 2.
- the outlets 913 in Fig. 9 have a diameter of 1. Omm and a pitch of 6. Omm. It is.
- the shape of the ejection port 913 is a perfect circle, and the sectional shape of the hole (ejection port) is a circle.
- the width of the ejection part 910 is 500 mm. Then, hot air is blown under conditions of a temperature of 105 ° C and an air volume of 12001Z.
- the original fabric composed of the fibers shown above is opened by a card machine with a speed of 20 mZ to create a multi-layer fiber web, and this multi-layer fiber web is cut to a width of 450 mm. The Then, the fiber web is placed on a 20-mesh breathable net that is moved in a predetermined direction at a speed of 3 mZ and conveyed. While the hot air is blown to one surface of the multi-layer fiber web by the ejection portion 910 described above, suction (intake) is performed from below the breathable net with an absorption amount smaller than the hot air amount. After forming irregularities (grooves, convex portions) in this way, the substrate is transported in an oven set at a temperature of 125 ° C and a hot air flow rate of 10 Hz in about 30 seconds with the air-permeable net placed.
- the obtained multilayer nonwoven fabric will be described below.
- Fiber weight is 51gZm 2 , thickness is 3.4mm (top thickness 2.3mm), fiber density is
- the width of one convex part is 4.6 mm, and the pitch is 5.9 mm.
- the second fiber layer in the convex part the thickness is 2.9 mm (top thickness 1.3 mm).
- Fiber basis weight is 24g / m 2 , thickness is 1.7mm, density is 0. Olg / cm 3 , width of one groove part is 1.2mm, pitch is 5.8mm.
- the back surface of the groove portion constitutes the outermost back surface of the nonwoven fabric, and the back surface shape of the convex portion protrudes upward and is disposed at a position not constituting the outermost surface of the nonwoven fabric.
- the convex portion has a dome shape, and the convex portion and the groove portion are formed so as to extend continuously in the longitudinal direction, and are alternately formed when viewed from the width direction. On the outermost surface of the convex portion, if the crossing strength between the fibers is partially different, the density formed by the force is the lowest.
- the fiber configuration is the same as that in the first embodiment.
- the obtained multilayer nonwoven fabric will be described below.
- the fiber basis weight is 49 gZm 2 , the thickness is 2.5 mm, the density is 0.02 g / cm 3 , the width of one convex part is 4.7 mm, and the pitch is 6.1 mm.
- the second fiber layer in the convex part 2 the thickness is 2.9 mm.
- Fiber basis weight is 21 g / m 2
- thickness is 1.8 mm
- density is 0. Olg / cm 3
- width of one groove part is 1.4 mm
- pitch is 6.1 mm.
- Shape The back surface shape of the convex portion 2 was formed to be a flat shape.
- the first fiber layer has a core-sheath structure of high-density polyethylene and polyethylene terephthalate polypropylene, with an average fineness of 3.3 dtex, an average fiber length of 51 mm, and 1% by mass of titanium oxide in the core with respect to the weight of each core sheath. mixed mass%, with 100% fibers hydrophilic oil-coated, fiber basis weight is to use a fiber layer formed by 15GZm 2 ⁇ Konaru card method.
- the second fiber layer a high-density polyethylene and polyethylene terephthalate core-sheath structure, with an average fineness of 5.6 dtex, an average fiber length of 4 mm, and 1% by mass of titanium oxide with respect to the mass of the core are mixed into a hydrophilic oil agent.
- a fiber layer is used which is composed of 100% coated fiber and is laminated by the airlaid method so that the fiber basis weight is 20 gZ m 2 .
- the third fiber layer has a core-sheath structure of high-density polyethylene and polypropylene with an average fineness of 2.
- the manufacturing conditions are the same as in the first embodiment.
- Fiber basis weight is 51 gZm 2 , thickness is 2.9 mm, density is 0.02 g / cm 3 , the width of one convex portion is 4.7 mm, and pitch is 6.1 mm.
- the thickness of the first fiber layer Z second fiber layer Z second fiber layer in the convex portion is 1. Omm / 1.3 mm / 0.6 mm.
- Fiber basis weight is 18g / m 2 , thickness is 1.8mm, density is 0. Olg / cm 3 , width of one groove is 1.4mm, pitch is 6.1mm.
- This embodiment is the same as the first embodiment except that the following support member is used instead of the breathable net.
- a plate-like support member in which the hole 233 is 2 mm long and 70 mm wide and is spaced 3 mm from the adjacent hole 233 is used.
- the thickness of the plate-like support member 230 is 0.5 mm.
- the material of the plate-like support member 230 is stainless steel.
- the obtained multilayer nonwoven fabric will be described below.
- Fiber basis weight is 43gZm 2 , thickness is 2.8mm, density is 0.02g / cm 3 , one convex part width is 4.7mm, pitch is 6.5mm.
- the second fiber layer in the convex part the thickness is 1.5 mm.
- Fiber basis weight is lOgZm 2 , thickness is 1.2mm, density is 0.008gZcm 3 , width of one groove part is 1.8mm, pitch is 6.5mm.
- 'Fine ridges in the groove 21gZm 2 in fiber, thickness is 1.9mm, density is 0. Olg / cm 3 , one ridge is 1.8mm in width, one ridge is 1.5mm in length CD pitch is 6 5mm, MD pitch is 5. Omm.
- Micro-recessed part (opening) in the groove Fiber basis weight is 0g / m 2 , thickness is Omm, density is Og / cm 3 , one micro-recessed part width is 1.8mm, one micro-recessed part length is 3 . 2 mm, CD pitch 6. 5 mm, MD pitch 5. Omm, fine depressed portions one aperture area 4. 2 mm 2, the shape is a vertically long elliptical shape.
- Shape Grooves 1 were formed with fine ridges and fine depressions (open holes).
- the multilayer nonwoven fabric in the present invention examples include surface sheets in absorbent articles such as sanitary napkins, liners, and diapers.
- the convex portion may face either the skin surface side or the back surface side opposite to the skin surface, but since the contact area with the skin is reduced by using the skin surface side, the bodily fluid To give a feeling of wetness.
- it can be used as an intermediate sheet between the surface sheet of the absorbent article and the absorbent body. In this case, since the contact area with the topsheet or the absorber decreases, it may be difficult to reverse the absorber.
- side sheets of absorbent articles, outer surfaces such as diapers (outer backs), female hook-and-loop fastener materials, etc. can be suitably used because they have a reduced contact area with the skin and a feeling of cushion.
- it can be used in various fields such as wipers, masks, breast milk pads for removing dust and dirt adhering to the floor and body.
- the second fiber layer is also a multilayer nonwoven fabric having a high degree of freedom of the fibers constituting the first fiber layer protruding to the first fiber layer side, and has unevenness (groove portion 1 on one side).
- the multilayer nonwoven fabric on which the convex portions 2) are formed can be used as the surface sheets 301, 302 of the absorbent article (sanitary napkin, omu) by arranging the convex portions so that the convex portions face the skin surface side.
- the fibers of the first fiber layer constituting the convex portion 2 that is in direct contact with the skin have a relatively high degree of freedom, there is an advantage that it is difficult for a wearer with sensitive skin to feel a foreign object.
- the fibers constituting the inside of the convex portion 2 are constituted by the second fiber layer having a relatively low degree of freedom, and the central portion 9 of the convex portion 2 is oriented in the thickness direction. Because it contains a lot of fibers, it is not easily crushed even if a load is applied to the convex part. Even if the load is further applied and the convex part 2 is crushed, the recoverability after the load is released is high.
- the fiber density of the second fiber layer is higher than that of the first fiber layer, a density gradient is provided when viewed from the thickness direction, so that the liquid excreted in the first fiber layer is preferably transferred to the second fiber layer. It can be transferred, and it will make liquid adhere to the skin even more.
- the second fiber layer is also a multilayer nonwoven fabric having a high degree of freedom of the fibers constituting the first fiber layer protruding to the first fiber layer side, and has irregularities (grooves) on one side.
- the multilayer nonwoven fabric on which the convex portions 2) are formed can be used as the intermediate sheet 311 of the absorbent article in which the convex portions are arranged on the surface sheet 310 side.
- the intermediate sheet is disposed between the top sheet and the absorber.
- the multilayer nonwoven fabric By arranging the multilayer nonwoven fabric so that the convex part faces the surface sheet side, a plurality of spaces formed by the surface sheet 310 and the groove are provided, so a large amount of liquid force S is excreted at high speed on the surface sheet.
- the liquid permeation inhibiting factor is small, it is possible to prevent the liquid from spreading on the surface sheet.
- the contact rate between the multilayer nonwoven fabric and the surface sheet is low (the contact area is small), and it is difficult to reattach to the skin.
- the fiber portion of the second fiber layer has a higher fiber density than the first fiber layer, and the central portion 9 of the convex portion 2 contains more fibers oriented in the thickness direction than the periphery. And convex part 2 vertex and table The face sheet 310 is in contact. As a result, the liquid remaining on the top sheet is easily drawn in the thickness direction, and the liquid remains on the top sheet. By these, the spot property on the surface sheet 310 and the low residual property of the liquid can be obtained, and the liquid can be prevented from adhering to the skin for a long time.
- the second fiber layer is also a multilayer nonwoven fabric having a high degree of freedom of the fibers constituting the first fiber layer protruding to the first fiber layer side, and is uneven on one side (groove portion 1, convex).
- the case where the multilayer nonwoven fabric with the shaped part 2) is used as the outer surface (outer back) 321 of a diaper or the like is shown.
- the first fiber layer of the convex part provides a good tactile sensation, and the convex part is not crushed by the second fiber layer even when a load is applied, so the tactile sensation is high.
- the multilayer nonwoven fabric according to the present invention is a substantially sheet-like multilayer fiber assembly such as a fiber web 100 in which a first fiber web 100A and a second fiber web 100B are laminated as shown in FIG.
- the fiber orientation, fiber density, or fiber basis weight is adjusted by spraying a fluid mainly composed of gas, or a predetermined groove or opening is formed.
- the fiber assembly is a multilayer fiber assembly formed in a sheet shape, and the fibers constituting the fiber assembly have a degree of freedom. In other words, at least some of the fibers constituting the multilayer fiber assembly are in a free state. Further, at least some of the fibers constituting the multilayer fiber assembly are included in a state in which the mutual positional relationship can be changed.
- This multilayer fiber assembly can be manufactured, for example, by ejecting mixed fibers obtained by mixing a plurality of fibers so as to form a fiber layer having a predetermined thickness. Specifically, each of a plurality of different fibers can be produced by spraying so as to form a fiber layer by laminating a plurality of different fibers.
- Examples of the (multilayer) fiber assembly in the present invention include, for example, a fiber web manufactured by a card method, or a fiber web before heat-bonding and solidifying heat-bonding of fibers. Can show. Moreover, the web produced by the airlaid method, or the fiber web before the heat fusion between the fibers is solidified by heat fusion can be exemplified. Moreover, the fiber web before the heat-bonding embossed by the point bond method solidifies can be illustrated. Moreover, the fiber aggregate before being spun and embossed by the spunbond method or the fiber aggregate before the embossed heat fusion is solidified can be exemplified. Moreover, the fiber web manufactured by the needle punch method and semi-entangled can be illustrated.
- the fiber web produced by the spunlace method and semi-entangled can be exemplified.
- melting by the melt blown method and heat-bonding of fibers solidifies can be illustrated.
- the fiber aggregate before fiber solidifies with the solvent produced by the solvent bonding method can be illustrated.
- the fibers are easily rearranged by a flow of air (gas)! /, which is a fiber web manufactured by a card method using relatively long fibers, and further, the fibers move.
- An example is a web before heat-sealing that is manufactured only by confounding, which is in an easy state.
- an oven treatment heatating treatment
- a predetermined heating device or the like is preferable.
- the multilayer fiber web in the above-described embodiment a laminate of a plurality of fiber webs having different properties and functions can be used.
- fibers constituting the fiber assembly include, for example, low density polyethylene, high density polyethylene, linear polyethylene, polypropylene, polyethylene terephthalate, modified polypropylene, and modified polypropylene.
- fibers composed of a thermoplastic resin such as polyethylene terephthalate, nylon, polyamide, etc., each of which is single or composite.
- Examples of the composite shape include a core-sheath type in which the melting point of the core component is higher than that of the sheath component, an eccentric type of the core-sheath, and a side-by-side type in which the melting points of the left and right components are different.
- hollow type, flat type, Y type, C type, etc., three-dimensional crimped fiber of latent crimp or actual crimp, split fiber divided by physical load such as water flow, heat, emboss, etc. are mixed. Well, okay.
- predetermined actual crimped fibers or latent crimped fibers are arranged.
- examples of the three-dimensional crimped shape include a spiral shape, a zigzag shape, and an ⁇ shape, and the fiber orientation is generally directed in the thickness direction even though the fiber orientation is directed in the plane direction.
- the buckling strength of the fiber itself works in the thickness direction, so that the bulk is crushed even when an external pressure is applied.
- the nonwoven fabric tends to return to its original shape when the applied external pressure is released, so that the nonwoven fabric is slightly thinned due to excessive external pressure. Even if it is crushed, it will easily return to its original thickness after the external pressure is released.
- the actual crimped fiber is a general term for fibers that are preliminarily crimped by imparting a shape by mechanical crimping, a core-sheath structure is eccentric type, side-by-side, or the like.
- Latent crimped fibers are those that are crimped by the application of heat.
- the crimped state can be controlled by the difference in peripheral speed, heat, and pressure in the machine flow direction with respect to continuous linear fibers after spinning.
- the number of crimps per unit length of the fiber is preferably in the range of 10 to 35 Zinch, more preferably 15 to 30 Zinch.
- Examples of the fibers that are crimped by heat shrinkage include fibers made of two or more rosins having different melting points. Such fibers are crimped three-dimensionally due to differences in heat shrinkage during heating.
- the heat-shrinkable fiber is composed of a core-sheathed fiber with an eccentric type in which the core is arranged away from the center of the cross section, and the melting point of the resin constituting one half and the other half of the cross section. Different side-by-side types can be illustrated.
- the heat shrinkage rate of such fibers is, for example, 5 to 90%, preferably 10 to 80%.
- the heat shrinkage measurement method is as follows: (1) Fabricate a 200gsm (gZm 2 ) fiber web with 100% of the fiber to be measured; (2) Cut this fiber web into a size of 250 X 250mm. (3) leave this sample in a 145 ° C (418. 15K) oven for 5 minutes, (4) measure the length of the sample after heat shrinkage, and (5) heat The shrinkage rate can be calculated from the difference in length before and after heat shrinkage.
- the fineness is preferably in the range of 1.1 to 8.8 dtex in consideration of, for example, liquid penetration and touch.
- the fibers constituting the fiber assembly may be, for example, pulp, chemical pulp, Cellulose-based liquid hydrophilic fibers such as rayon, acetate, and natural cotton may be included.
- the cellulosic fibers are difficult to discharge the liquid once absorbed, for example, a case where it is mixed in the range of 0.1 to 5% by mass with respect to the whole can be illustrated as a preferable embodiment.
- these cellulose-based liquid hydrophilic fibers are preferably contained in the second fiber layer.
- the multilayer nonwoven fabric is used as a surface sheet, for example, in consideration of liquid penetration and rewet back, a hydrophilic agent or a water repellent is kneaded into the hydrophobic synthetic fiber exemplified above, Coated fibers may be used. It is also possible to use fibers that have been rendered hydrophilic by corona treatment or plasma treatment!
- an inorganic filler such as titanium oxide, barium sulfate, or calcium carbonate may be contained.
- the inorganic filler may be contained only in the core, or may be contained in the sheath.
- the fiber web manufactured by a card method using relatively long fibers that allows the fibers to be easily rearranged by airflow.
- the through-air method in which thermoplastic fibers are thermally fused by oven treatment (heat treatment) is preferable.
- the fiber suitable for this production method it is preferable to use a fiber having a core-sheath structure or a side-by-side structure in order to heat-bond the intersections of the fibers. It is preferably composed of structural fibers.
- the fiber length of the fibers constituting the nonwoven fabric (fiber web) is 20 to 100 mm, preferably 35 to 65 mm.
- the orientation of the fiber in the longitudinal direction means that the fiber is oriented within a range of + 45 ° force to 45 ° with respect to the longitudinal direction (MD). And the fibers oriented in the longitudinal direction The fibers are called longitudinally oriented fibers. Further, the orientation of the fiber in the width direction (CD) means that the fiber is oriented in a range of + 45 ° to 145 ° with respect to the width direction. A fiber oriented in the width direction (CD) is called a horizontally oriented fiber.
- Measurement of fiber orientation was performed by the following measuring method using a digital microscope VHX-100 manufactured by Keyence Corporation.
- (1) Set the sample on the observation table so that the longitudinal direction is the vertical direction.
- (2) Except for the fibers that protrude irregularly to the front, focus the lens on the foremost fiber of the sample.
- Set the shooting depth (depth) and create a sample 3D image on the PC screen.
- (4) convert the 3D image into a 2D image, and (5) draw multiple parallel lines on the screen that equally divide the longitudinal direction in the measurement range.
- (6) In each cell subdivided by drawing parallel lines, observe whether the fiber orientation is the longitudinal direction, and measure the number of fibers oriented in each direction.
- (7) By calculating the ratio of the number of fibers oriented in the longitudinal direction and the ratio of the number of fibers oriented in the width direction with respect to the total number of fibers in the set range, Can be calculated and measured.
- Examples of the fluid mainly composed of a gas force in the present invention include a gas adjusted to room temperature or a predetermined temperature, or an air sol containing solid or liquid fine particles in the gas.
- Examples of the gas include air and nitrogen.
- the gas contains liquid vapor such as water vapor.
- the A-sol is a liquid or solid dispersed in a gas, examples of which are given below.
- inks for coloring softeners such as silicone for enhancing flexibility, hydrophilic or water repellent activators for controlling antistatic properties and wettability, and acids for increasing fluid energy
- Inorganic fillers such as titanium and barium sulfate, powder bonds such as polyethylene to increase fluid energy and maintain unevenness in heat treatment, diphenhydramine hydrochloride, isopropyl methylphenol, etc. to prevent itching
- anti-histamines, moisturizers, disinfectants and the like dispersed therein can be exemplified.
- the solid includes a gel.
- the temperature of the fluid mainly composed of gas can be adjusted as appropriate. It can be appropriately adjusted according to the properties of the fibers constituting the fiber assembly, the fiber orientation of the multilayer nonwoven fabric to be manufactured, the fiber density or the fiber basis weight, and the shape of the predetermined groove or opening.
- the temperature of the fluid mainly composed of gas is higher when the temperature of the fluid constituting the fiber assembly is higher to some extent. This is preferable because the degree of freedom increases.
- the fluid mainly composed of gas was sprayed by setting the temperature of the fluid composed mainly of gas to a temperature at which the thermoplastic fiber can be softened.
- the thermoplastic fiber disposed in the region or the like can be configured to be softened or melted and cured again.
- the fluid in the form of gas is mainly sprayed to maintain the fiber orientation, the fiber density, the fiber basis weight, etc., and the shape of the groove and the opening.
- the fiber assembly is moved by a predetermined moving means, the fiber assembly (multilayer nonwoven fabric) is given a strength of about ⁇ / ⁇ .
- the flow rate of the fluid mainly composed of gas can be appropriately adjusted according to the target fiber orientation, fiber density, or fiber basis weight, and the shape of the target groove or opening.
- a sheath is made of high-density polyethylene and a core is made of polyethylene terephthalate. 1 to 8.8 dtex, preferably 2.2 force 5.
- Mainly 6dtex core-sheath fiber, fiber length is 20 to 100mm, preferably 35 to 65mm, if opened by card method, opened by air laid method Then, a fiber web 100 prepared by using a fiber having a fiber length of 1 to 50 mm, preferably 3 to 20 mm, and adjusted to 10 force 1000 gZm 2 , preferably 15 to lOOgZm 2 can be exemplified.
- a fluid mainly having a gas force for example, an ejection portion 910 (a ejection port 913: a diameter of 0.1 force and a diameter of 30 mm, preferably 0) formed with a plurality of ejection ports 913 shown in FIG. 8 or FIG.
- Pitch is 0.5 force to 30mm, preferably 0.1 to 10mm: shape is perfect circle, ellipse or rectangle), temperature is 15 to 300 ° C (288.15K to 573.15K) , Preferably ⁇ 100 force 200 etc. C (373. 15K force et al. 473. 15K) hot air with fiber volume of 3 to 50 [L / (min ⁇ hole)], preferably 5 to 20 [L / (min ⁇ hole)]
- An example of web 100 spraying For example, a fluid consisting mainly of gas is ejected under the above conditions. When applied, there is a fiber assembly whose constituent fibers can change its position and orientation.
- the above-mentioned multilayer nonwoven fabric can be formed.
- the area constituting the bottom of the groove part 1 and the dimensions and fiber basis weight of the convex part 2 can be manufactured within the following ranges.
- the thickness is 0.05 to 10 mm, preferably 0.1 to 5 mm
- the width is 0.1 force to 30 mm, preferably 0.5 to 5 mm
- the fiber texture is The range is 2 to 900 gZm 2 , preferably 10 to 90 gZm 2 .
- Convex part 2 has a thickness of 0.1 force to 15 mm, preferably 0.75 to 0.5 force to 10 mm, width 0.75 to 0.5 force to 30 mm, preferably 1.0 to 10 mm, fiber weight Is in the range of 5 forces to 1000 gZm 2 , preferably 10 to 100 g / m 2 .
- the force capable of producing a multilayer nonwoven fabric within the above numerical range is not limited to this range.
- the fiber assembly can include, for example, thermoplastic fibers.
- thermoplastic fibers for example, the fluid which is mainly gas force and is sprayed on the upper surface side which is the other surface side of the fiber assembly, such as a predetermined spraying means, is thermoplastic.
- the temperature can be higher than the predetermined temperature at which the fiber can be softened.
- thermoplastic fiber disposed in a region or the like where a fluid composed mainly of gas is sprayed is used. It can be configured to soften or melt and harden again.
- a fluid that is mainly a gas force is sprayed, so that the fiber orientation, the fiber density, the fiber basis weight, and the like, and the shape in the groove and the opening are maintained.
- a strength is provided so that the fiber assembly (multilayer nonwoven fabric) is not scattered.
- the above description can be referred to for the contents of fibers and fluids mainly composed of gas.
- the air-permeable support member is, for example, a fluid mainly ejected from the ejection portion 910 in FIG. It is a support member which can be ventilated on the opposite side to the formed side.
- a support member that is capable of allowing a mainly gas-powered fluid to pass through without substantially changing its flow for example, a mesh-like support member 210 shown in Fig. 4A or Fig. 4B can be exemplified.
- the net-like support member 210 can be manufactured, for example, by a fine-mesh net-like member formed so that a fine wire is knitted. Further, the net-like support member 210 is a gas-permeable support member in which a net-like, which is a first ventilation portion described later, is disposed as a whole.
- the fluid that mainly has a gas force applied to the upper surface side force in the fiber web 100 is opposite to the side in which the fiber web 100 is disposed in the breathable support member.
- the fiber that constitutes the fiber web 100 cannot be vented to the lower side of the air-permeable support member.
- 101, 102 may be provided with an air-impermeable portion that cannot move to the opposite side of the air-permeable support member.
- an air-permeable support member for example, a support member in which an air-impermeable member is arranged in a predetermined pattern on a predetermined mesh member, or a predetermined hole is provided in an air-permeable plate-like member.
- a plurality of support members formed can be exemplified.
- Examples of the support member in which the air-impermeable portion is arranged in the predetermined patterning on the predetermined mesh member include, for example, an elongated air-permeable member on one surface of the mesh support member 210 shown in FIG.
- An example is a support member 220 in which the members 225 are arranged in parallel at equal intervals.
- another embodiment can be exemplified by appropriately changing the shape and arrangement of the elongated member 225 which is an air-impermeable member.
- the non-venting portion can be formed not only when the elongated member 225 is disposed on one surface of the mesh-like support member 210 but also by filling the mesh-like eye that is the ventilation portion (for example, from solder, grease, etc.). .
- FIG. 1 As a member in which a plurality of predetermined holes are formed in the air-impermeable plate-like member, for example, FIG.
- a plurality of elliptical hole portions 233 which are ventilation portions shown in 19A or 19B
- the shape, size, and arrangement of the hole 233 are appropriately adjusted can be exemplified as another embodiment.
- an example in which the shape or the like of the plate portion 235 that is a non-venting portion is appropriately adjusted can be exemplified as another embodiment.
- the fiber constituting the fiber web 100 passes through the ventilation portion of the air-permeable support member.
- the first ventilation portion and the fibers constituting the fiber assembly cannot be substantially moved to the side (lower side) opposite to the side on which the fiber web 100 is placed in the air support member.
- a second ventilation part movable to the opposite side.
- first ventilation portion for example, a net-like region in the net-like support member 210 can be exemplified.
- the second ventilation portion for example, the hole portion 233 in the plate-like support member 230 can be shown in a row.
- a mesh-like support member 210 can be exemplified.
- An example of the air-permeable support member having the air-impermeable portion and the first air-permeable portion is a support member 220.
- a support member having a non-venting part and a second ventilation part for example, a plate-like support member 230 can be exemplified.
- breathable support member including a first vent portion and a second vent portion
- a breathable support member including an impermeable support member, a first vent portion, and a second vent portion examples include a breathable support member including an impermeable support member, a first vent portion, and a second vent portion.
- the breathable support member composed of the first ventilation portion and the second ventilation portion include a breathable support body in which a plurality of openings are formed in the mesh-like support member 210.
- the air-permeable support member including the air-impermeable support member, the first air-permeable portion, and the second air-permeable portion include, for example, an air-permeable support member in which a plurality of openings are formed in the mesh region of the support member 220. be able to.
- examples of the breathable support member include a support member having a substantially flat surface or a substantially curved surface on the side where the fiber web 100 is supported, and a substantially flat surface in the planar shape or the curved surface.
- examples of the substantially planar shape or the substantially curved surface shape include a plate shape and a cylindrical shape.
- the substantially flat shape means that, for example, the surface of the support member on which the fiber web 100 is placed is not formed in an uneven shape.
- the support member can be exemplified as the mesh in the mesh support member 210 is formed in a concave or convex shape.
- Examples of the air-permeable support member include a plate-like support member and a cylindrical support member.
- the net-like support member 210, the support member 220, the plate-like support member 230, the air-permeable support drum, and the like described above can be exemplified.
- the breathable support member can be detachably disposed on the multilayer nonwoven fabric manufacturing apparatus 90. This allows the desired fiber orientation, fiber density or fiber in the desired multilayer nonwoven fabric A breathable support member according to the basis weight or the shape of a predetermined groove or opening can be appropriately disposed. In other words, in the multilayer nonwoven fabric manufacturing apparatus 90, the breathable support member can be replaced with another breathable support member selected from a plurality of different breathable support member forces. Further, it can be said that the present invention includes a multilayer nonwoven fabric production system including, for example, a multilayer nonwoven fabric production apparatus 90 and a plurality of different breathable support members.
- the mesh portion of the mesh support member 210 or the support member 220 will be described below.
- this breathable net-like part include polyester 'polyphenylene sulfide' nylon, yarn made of grease such as conductive monofilament, or yarn made of metal such as stainless steel, copper, aluminum, etc.
- Examples include breathable nets woven by weaving, double weaving, spiral weaving, etc.
- the air permeability of this breathable net can be partially changed by, for example, partially changing the weaving method, the thickness of the yarn, and the yarn shape. Specifically, it can be exemplified by a polyester woven breathable mesh, stainless steel flat and circular woven spiral woven mesh.
- a silicone foam or the like is applied to a breathable net by patterning, or a non-breathable material is partially joined. You may do it.
- a 20-mesh breathable net made of polyester can be coated with silicone resin so as to extend in the width direction and repeat in the line flow direction.
- the silicone resin becomes a non-venting part joined with a non-venting material, and the other part becomes the first ventilation part.
- the surface is smooth in order to increase the surface slipperiness.
- a sleeve made of a metal such as stainless 'copper' aluminum can be exemplified.
- the sleeve can be exemplified by the metal plate partially cut out in a predetermined pattern.
- the portion where the metal is hollowed out becomes the second ventilation portion, and the portion where the metal is not hollowed out becomes the non-venting portion.
- the non-venting portion has a smooth surface in order to improve the slip property of the surface.
- a sleeve for example, a hole that is 3 mm long and 40 mm wide and rounded at each corner and is hollowed out with metal is spaced 2 mm apart in the line flow direction (moving direction).
- a stainless steel sleeve having a thickness of 0.3 mm, which is arranged in a grid pattern with an interval of 3 mm can be exemplified.
- a sleeve in which holes are arranged in a staggered manner can be exemplified.
- a hole with a diameter of 4 mm and a hole in which metal is hollowed out is an example of a stainless steel sleeve with a thickness of 0.3 mm arranged in a staggered pattern with a pitch of 12 mm in the production flow direction (MD) and a pitch of 6 mm in the width direction it can.
- MD production flow direction
- the pattern of the hole to be hollowed out (holes to be formed) and the arrangement of the holes to be hollowed out can be set as appropriate.
- a breathable support member provided with undulations in the thickness direction can be exemplified.
- an air-permeable support body in which portions where the fluid of mainly gas force is not directly sprayed is alternately undulated (for example, waved) in the line flow direction (movement direction) can be exemplified.
- a breathable support member for example, fiber orientation, fiber density or fiber basis weight is adjusted, and predetermined grooves and openings are formed, and the overall shape of the multilayer nonwoven fabric is formed.
- the basis weight and the shape and size of the formed groove and opening are completely different.
- a multilayer nonwoven fabric adjusted to have a desired fiber orientation, fiber density, or fiber basis weight, or a multilayer nonwoven fabric having grooves and openings of a desired shape are obtained. be able to.
- the multilayer nonwoven fabric manufacturing apparatus 90 continuously sprays a fluid that mainly has gas force from the spraying means onto the fiber web 100 that is a fiber assembly, so that the fiber orientation, fiber density, or density
- a fluid that mainly has gas force from the spraying means onto the fiber web 100 that is a fiber assembly so that the fiber orientation, fiber density, or density
- One of the features is that a multilayer nonwoven fabric with a fiber basis weight and a predetermined groove or opening can be manufactured.
- the moving means moves the (multilayer) fiber web 100, which is a fiber assembly in a state of being supported from the one surface side by the above-described air-permeable support member, in a predetermined direction.
- the moving means is a fiber web 100 in a state in which a fluid mainly having a gas force is sprayed. Is moved in the predetermined direction F.
- An example of the moving means is a conveyor 930 shown in FIG.
- the conveyor 930 is disposed at both ends in the longitudinal direction inside the breathable belt portion 939, and a breathable breathable belt portion 939 formed in a horizontally long ring shape on which the breathable support member is placed.
- the breathable support member is the mesh-like support member 210 or the support member 220
- the above-described breathable belt portion 939 may not be disposed.
- the air-permeable support member is a support body in which large holes are formed like the plate-like support member 230, for example, the fibers constituting the fiber tube 100 are dropped from the hole cap and used in the process.
- the breathable belt portion 939 As the breathable belt portion 939, for example, a net-like belt portion is preferable.
- the conveyor 930 moves the air-permeable support member in a state where the fiber web 100 also supports the lower surface side force in the predetermined direction F. Specifically, the fiber web 100 is moved so as to pass under the ejection part 9 10. Furthermore, the fiber web 100 is moved so as to pass through the inside of the heater unit 950 that is open on both side surfaces, which are heating means.
- a combination of a plurality of conveyors can be exemplified as the moving means.
- the fiber orientation in the multilayer nonwoven fabric and the fibers can be appropriately adjusted by appropriately adjusting the speed of moving toward the ejection unit 910 and the speed of movement moving away from the ejection unit 910. It is possible to adjust the density or the fiber basis weight, the shape of the groove or the opening, and the like. Details are as described later.
- the multilayer nonwoven fabric produced by being heated by the heater unit 950 is moved to, for example, a process of cutting the multilayer nonwoven fabric into a predetermined shape or a winding process by the conveyor 940 continuous with the conveyor 930 in the predetermined direction F. Is done. Similar to the conveyor 930, the conveyor 940 includes a belt portion 949, a rotating portion 941, and the like.
- the spraying means includes an air supply unit (not shown) and an ejection unit 910.
- An air supply unit (not shown) is connected to the ejection unit 910 via an air supply tube 920.
- the air supply pipe 920 is connected to the upper side of the ejection part 910 so as to allow ventilation.
- the ejection portion 910 has a plurality of ejection ports 913 formed at predetermined intervals. [0235] The gas supplied to the ejection unit 910 via the air feeding pipe 920 is also ejected from a plurality of ejection ports 913 formed in the ejection unit 910.
- the gas ejected from the plurality of ejection ports 913 is continuously ejected to the upper surface side of the fiber web 100 supported by the air-permeable support member from the lower surface side. Specifically, the gas ejected from the plurality of ejection ports 913 is continuously ejected onto the upper surface side of the fiber web 100 in a state where it is moved in the predetermined direction F by the conveyor 930.
- An intake portion 915 disposed below the ejection portion 910 and below the breathable support member sucks in gas or the like that is ejected from the ejection portion 910 and further ventilated through the breathable support member.
- the fiber web 100 can be positioned so as to stick to the air-permeable support member by the air intake by the air intake portion 915.
- the fiber web can be conveyed into the heater unit 950 by the intake air while maintaining the shape of the groove (unevenness) formed by the air flow. In other words, it is preferable that the heating process is performed by the heater unit 950 from the time of molding by the air flow, and the air is conveyed while the downward force is sucked by the intake unit.
- the groove portions 1 are formed at predetermined intervals on the upper surface side of the fibrous web 100 by a fluid mainly jetted from the ejection ports 913 formed at predetermined intervals in the width direction of the fibrous web 100.
- a multilayer nonwoven fabric 110 is produced.
- the diameter of the ejection port 913 is 0.1 to 30 mm, preferably 0.3 to 10 mm, and the pitch between the ejection ports 913 is 0.5 force to 20 mm, preferably 3 to An example in which 10 mm is formed can be exemplified.
- Examples of the shape of the outlet 913 include a perfect circle, an ellipse, a square, and a rectangle, but are not limited thereto.
- the cross-sectional shape of the ejection port 913 can be exemplified by a cylindrical shape, a trapezoidal shape, and an inverted trapezoidal shape, but is not limited thereto. Considering that air is efficiently blown onto the fiber web 100, the shape is preferably a perfect circle and the cross-sectional shape is preferably a cylindrical shape.
- the outlet 913 can be designed according to the desired fiber orientation, fiber density, or fiber basis weight of the multilayer nonwoven fabric, and a predetermined groove or opening.
- the hole diameters of the plurality of ejection ports 913 may be different from each other, or the ejection ports 913 may be formed in a plurality of rows in the ejection portion 910.
- the temperature of the fluid mainly ejected from each of the ejection ports 913 is However, for example, in order to improve the moldability of the groove (unevenness) and the opening, at least the softening point of the thermoplastic fiber constituting the fiber aggregate, preferably the softening point or more
- the melting point can be adjusted to + 50 ° C or lower.
- the temperature at which the fibers are easily rearranged by an air flow or the like is further increased, heat fusion between the fibers starts and the groove portion is further increased. It becomes easy to keep the shape such as (unevenness). This facilitates conveyance into the heater unit 950 while maintaining the shape of the groove (unevenness) or the like.
- the heater portion 950 in order to convey the shape of the groove (unevenness) formed by the air flow or the like to the heater portion 950, the heater portion immediately after or simultaneously with the formation of the groove (unevenness) by the air flow or the like It can be transported into 950 or cooled by cold air or the like immediately after forming a groove (unevenness) by hot air (air flow at a predetermined temperature), and then transported to the heater unit 950.
- the fibers in the fiber web 100 are moved, the fiber orientation of the fibers, the fiber density or the fiber basis weight, the shape of the formed groove or opening,
- the flow velocity or flow rate of the gas ejected from the ejection unit 910 can be exemplified.
- the flow velocity and flow rate of the gas to be ejected can be adjusted by, for example, the amount of air fed in an air feeding unit (not shown) or the number and diameter of the ejection ports 913 formed in the ejection unit 910.
- the ejection portion 910 can change the groove portion 1 (groove portion) in the formed unevenness, the height of the convex portion, etc. Can be adjusted as appropriate.
- the groove or the like can be appropriately adjusted so as to have a meandering shape (wave shape, zigzag shape) or another shape.
- the shape and formation pattern of a groove part and an opening part can be suitably adjusted by adjusting the ejection amount and ejection time of the fluid which mainly consist of gas.
- the jetting angle of the fluid, which is mainly a gas force, with respect to the fiber web 100 may be vertical.
- the fluid web 100 is directed in a line flow direction that is the movement direction F by a predetermined angle.
- the direction of the line flow may be opposite by a predetermined angle.
- the heater unit 950 which is a heating means, is open at both ends in view of a predetermined direction F force.
- the fiber web 100 (multilayer nonwoven fabric 110) placed on the breathable support member moved by the conveyor 930 is conveyed to the heating space formed inside the heater unit 950 and stays for a predetermined time, Then it is carried outside.
- thermoplastic fibers are included in the fibers 101 constituting the fiber web 100 (multilayer nonwoven fabric 110)
- the fibers are fused by heating in the heater section 950 and cooled by being conveyed to the outside.
- a method for adhering the fibers 101 and 102 in the multilayer nonwoven fabric 110 in which the fiber orientation, fiber density or fiber basis weight is adjusted and one or more of Z or a predetermined groove, opening or protrusion is formed for example, a needle
- a needle examples include adhesion by a punch method, a spunlace method, and a solvent adhesion method, and thermal adhesion by a point bond method and an air-through method.
- the air-through method is preferable. For example, heat treatment in the air-through method using the heater unit 950 is preferable.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Nonwoven Fabrics (AREA)
- Absorbent Articles And Supports Therefor (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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CN2007800172082A CN101443500B (zh) | 2006-06-23 | 2007-06-06 | 多层无纺布及多层无纺布的制造方法 |
EP07744787.8A EP2034072B1 (en) | 2006-06-23 | 2007-06-06 | Multilayer nonwoven fabric and process for producing the same |
Applications Claiming Priority (4)
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JP2006174505 | 2006-06-23 | ||
JP2006-174505 | 2006-06-23 | ||
JP2006270107A JP5328089B2 (ja) | 2006-06-23 | 2006-09-29 | 多層不織布及び多層不織布の製造方法 |
JP2006-270107 | 2006-09-29 |
Publications (1)
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WO2007148533A1 true WO2007148533A1 (ja) | 2007-12-27 |
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PCT/JP2007/061444 WO2007148533A1 (ja) | 2006-06-23 | 2007-06-06 | 多層不織布及び多層不織布の製造方法 |
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US (2) | US9156229B2 (ja) |
EP (1) | EP2034072B1 (ja) |
JP (1) | JP5328089B2 (ja) |
KR (1) | KR20090023341A (ja) |
MY (1) | MY151023A (ja) |
WO (1) | WO2007148533A1 (ja) |
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2007
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- 2007-06-06 WO PCT/JP2007/061444 patent/WO2007148533A1/ja active Application Filing
- 2007-06-06 MY MYPI20085195 patent/MY151023A/en unknown
- 2007-06-06 EP EP07744787.8A patent/EP2034072B1/en not_active Not-in-force
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Also Published As
Publication number | Publication date |
---|---|
EP2034072A4 (en) | 2011-05-25 |
MY151023A (en) | 2014-03-31 |
EP2034072B1 (en) | 2013-09-11 |
US20080085399A1 (en) | 2008-04-10 |
US20090282660A1 (en) | 2009-11-19 |
EP2034072A1 (en) | 2009-03-11 |
KR20090023341A (ko) | 2009-03-04 |
JP2008025081A (ja) | 2008-02-07 |
US9156229B2 (en) | 2015-10-13 |
US7955549B2 (en) | 2011-06-07 |
JP5328089B2 (ja) | 2013-10-30 |
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