WO2021256146A1 - スパンボンド不織布および衛生材料 - Google Patents

スパンボンド不織布および衛生材料 Download PDF

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Publication number
WO2021256146A1
WO2021256146A1 PCT/JP2021/018742 JP2021018742W WO2021256146A1 WO 2021256146 A1 WO2021256146 A1 WO 2021256146A1 JP 2021018742 W JP2021018742 W JP 2021018742W WO 2021256146 A1 WO2021256146 A1 WO 2021256146A1
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Prior art keywords
nonwoven fabric
spunbonded nonwoven
fibers
fiber
present
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PCT/JP2021/018742
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English (en)
French (fr)
Japanese (ja)
Inventor
梶原健太郎
森岡英樹
船津義嗣
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東レ株式会社
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Priority to JP2021527875A priority Critical patent/JPWO2021256146A1/ja
Priority to KR1020227038388A priority patent/KR20230024256A/ko
Publication of WO2021256146A1 publication Critical patent/WO2021256146A1/ja

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/016—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the fineness
    • 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
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/14—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding

Definitions

  • the present invention relates to a spunbonded nonwoven fabric that has both excellent water absorption and quick-drying properties and a soft touch, and is particularly suitable for sanitary material applications, and sanitary materials using the same.
  • a spunbonded nonwoven fabric having a laminated structure of fiber layers containing long fibers for the purpose of imparting water absorption and quick-drying to the nonwoven fabric, the distance between the hydrophobic layer containing the hydrophobic fibers and the flatness and flatness.
  • a spunbonded nonwoven fabric composed of a hydrophilic layer containing hydrophilic fibers having a ratio in a specific range and having the hydrophobic layer arranged on the surface of the nonwoven fabric has been proposed (see Patent Document 1).
  • a higher average non-woven fabric diameter is provided between the first and third non-woven fabric constituent layers containing fibers having an average non-woven fabric diameter in a specific range and the first and third non-woven fabric layers.
  • An absorbent article containing a spunbonded nonwoven fabric for arranging a second nonwoven fabric constituent layer containing the fine fibers of the above has been proposed (see Patent Document 2).
  • Patent Document 2 relates to a spunbonded nonwoven fabric having a structure in which a nonwoven fabric layer composed of fibers having different average single fiber diameters is laminated.
  • this non-woven fabric since this non-woven fabric is used for a barrier cuff, it has a structure that prevents fluid from strike through, that is, has a structure that does not allow moisture to pass through, and liquid residue is likely to occur on the surface of the non-woven fabric, so that water absorption and quick-drying are insufficient. Met. In addition, the softness of the surface that touches the skin was not sufficient.
  • an object of the present invention has been made in view of the above circumstances, and is a spunbond having sufficient water absorption and quick-drying property to maintain comfort when worn, and having a soft touch. It is an object of the present invention to provide a spunbonded nonwoven fabric which is a nonwoven fabric and is preferably used as a sanitary material.
  • the present inventors have a fused portion and a non-fused portion in the spunbonded nonwoven fabric, and the fibers constituting one surface (A). And the ratio of the average single fiber diameters of the fibers constituting the other surface (B), and the contact angle between the surface (A) and the water of the surface (B) within a specific range, and the surface (A). It has been found that by setting the degree of bending of the constituent fibers within a specific range, the non-woven fabric has sufficient water absorption and quick-drying property to maintain comfort when worn, and has a soft touch feeling.
  • the spunbonded nonwoven fabric of the present invention has a fused portion and a non-fused portion, and has an average single fiber diameter (Da) of fibers on one surface (A) and an average single fiber of fibers on the other surface (B).
  • the ratio (Da / Db) to the diameter (Db) is 1.1 or more, the contact angles of the surface (A) and the surface (B) with water are both 30 ° or less, and the surface ( The degree of bending of the fiber of A) is 1.1 or more.
  • the diameter of the maximum inscribed circle of the non-fused portion is 2.0 mm or more.
  • the thickness (Tu) of the spunbonded nonwoven fabric in the non-fused portion is 0.5 mm or more.
  • the ratio (Tu / Tm) of the thickness (Tu) of the spunbonded nonwoven fabric in the non-fused portion to the thickness (Tm) of the spunbonded nonwoven fabric in the fused portion Is 2.0 or more.
  • the tortuosity of the fibers on the surface (B) is 1.1 or less.
  • the sanitary material of the present invention is at least partially composed of the above-mentioned spunbonded nonwoven fabric.
  • the surface (A) is arranged toward the skin side of the wearer.
  • the present invention it is possible to obtain a spunbonded nonwoven fabric which is excellent in water absorption and quick-drying property and soft touch, and which is particularly suitable for sanitary material applications, and sanitary materials using the same.
  • FIG. 1 is a top conceptual diagram illustrating a method for determining the maximum inscribed circle of a non-fused portion in one embodiment of the spunbonded nonwoven fabric of the present invention.
  • FIG. 2 is a top conceptual diagram illustrating a method for determining the maximum inscribed circle of the non-fused portion in another embodiment of the spunbonded nonwoven fabric of the present invention.
  • FIG. 3 is a top conceptual diagram illustrating a method for determining the maximum inscribed circle of the non-fused portion in still another embodiment of the spunbonded nonwoven fabric of the present invention.
  • the spunbonded nonwoven fabric of the present invention has a fused portion and a non-fused portion, and has an average single fiber diameter (Da) of fibers on one surface (A) and an average single fiber of fibers on the other surface (B).
  • the ratio (Da / Db) to the diameter (Db) is 1.1 or more, the contact angles of the surface (A) and the surface (B) with water are both 30 ° or less, and the surface ( The degree of bending of the fiber of A) is 1.1 or more.
  • the spunbonded nonwoven fabric of the present invention is preferably made of a thermoplastic resin.
  • the thermoplastic resin may be one kind or may be composed of a plurality of thermoplastic resins.
  • thermoplastic resin used for the fiber according to the present invention examples include aromatic polyester polymers such as "polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyhexamethylene terephthalate” and copolymers thereof, "polylactic acid”.
  • a water-insoluble ethylene-vinyl alcohol copolymer polymer containing 25 mol% to 70 mol% of ethylene units Polystyrene-based, polydiene-based, chlorine-based, polyolefin-based, polyester-based, polyurethane-based, polyamide-based, fluorine-based elastomer-based polymers and the like can be selected and used.
  • various additives such as titanium oxide, silica, inorganic substances such as barium oxide, carbon black, colorants such as dyes and pigments, flame retardants, fluorescent whitening agents, antioxidants, and ultraviolet absorbers are added.
  • the agent may be contained in the polymer.
  • the fiber in the present invention may be not only a single component fiber but also a composite fiber in which two or more kinds of resins are composited.
  • a composite fiber it is not particularly limited as long as it does not impair the effect of the present invention, and may be appropriately selected from a core sheath type, a sea island type, a side-by-side type, an eccentric core sheath type and the like. Further, it may be a split fiber type composite fiber in which a part or the whole of the fiber is divided into a plurality of fibers from one fiber.
  • the cross-sectional shape of the fiber in the present invention is not particularly limited as long as the effect of the present invention is not impaired, and may be a triangular, flat, hexagonal, hollow, or other irregular cross-section as well as a round cross-section.
  • all the fibers in the present invention have a contact angle with water of 90 ° or less.
  • the contact angle of the fiber with water is an index different from the contact angle with water on the surface of the nonwoven fabric described later, and if the contact angle exceeds 90 °, it becomes hydrophobic, and if it is 90 ° or less, it becomes hydrophilic. Since the fibers have a contact angle with water of 90 ° or less, the contact angle of the surface of the nonwoven fabric with water can be easily set to 30 ° or less.
  • the contact angle of the fiber with water in the present invention is, for example, an automatic contact equipped with an inkjet water droplet ejection unit with respect to the fiber taken out from the non-woven fabric left in a room at room temperature of 20 ° C. and relative humidity of 65% for 24 hours or more. It is obtained by measuring the angle between the air interface of the droplet and the fiber when a very small amount (15 pL) of water droplet is landed on the fiber surface using a horn meter.
  • thermoplastic resin constituting the fiber on the surface (A) and the fiber on the surface (B) may have the same or different fiber cross sections.
  • the surface (A) of the spunbonded nonwoven fabric of the present invention is composed of the fibers made of the above-mentioned thermoplastic resin.
  • the spunbonded nonwoven fabric of the present invention is preferably made of long fibers, and the constituent fibers of the surface (A) are preferably long fibers. This is because it is easy to achieve both high productivity and excellent mechanical characteristics because it is made of long fibers.
  • the average single fiber diameter of the fibers constituting the surface (A) of the spunbonded nonwoven fabric of the present invention is preferably 3.0 to 30.0 ⁇ m.
  • the average single fiber diameter of the fibers constituting the surface (A) is preferably 3.0 ⁇ m or more, more preferably 5.0 ⁇ m or more, and further preferably 10.0 ⁇ m or more.
  • the average single fiber diameter of the fibers constituting the surface (A) is preferably 30.0 ⁇ m or less, more preferably 28.0 ⁇ m or less, and further preferably 25.0 ⁇ m or less.
  • the average single fiber diameter referred to here is calculated as follows.
  • an image is taken of the cross section of the fibers constituting one surface at a magnification at which one fiber can be observed with a scanning electron microscope.
  • image analysis software for example, "WinROOF2015” manufactured by Mitani Corporation
  • the area Af ( ⁇ m 2 ) formed by the cross-sectional contour of the single fiber is measured, and this area Af is used.
  • the spunbonded nonwoven fabric of the present invention has a bending degree of fibers on the surface (A) of 1.1 or more.
  • the bending degree of the fiber on the surface (A) is preferably 1.2 or more, more preferably 1.3 or more. This is because a high water absorption rate can be obtained when the bending degree of the fiber on the surface (A) is 1.1 or more.
  • the mechanism by which a high water absorption rate is obtained is not clear, but it is presumed to be the effect of forming various interfiber voids.
  • the bending degree of the fiber on the surface (A) is 1.1 or more, it becomes easy to obtain a soft touch feeling.
  • the upper limit of the bending degree of the fiber on the surface (A) is not particularly limited, but is preferably 10.0 or less from the viewpoint of process stability and productivity.
  • the degree of fiber bending referred to here is obtained as follows.
  • an image is taken of one surface with a scanning electron microscope at a magnification that allows one fiber to be observed in a straight line over 500 ⁇ m. Then, using the captured image, using image analysis software (for example, National Institutes of Health "ImageJ"), the apparent length of the fiber was measured between two linear fibrous points of 500 ⁇ m. , The apparent length of this fiber is divided by 500 ⁇ m to calculate the apparent length / linear length. This is arbitrarily extracted and measured for 20 fibers constituting the same surface, a simple number average is obtained, and the value rounded to the second decimal place is defined as the tortuosity of the fibers on the surface in the present invention.
  • image analysis software for example, National Institutes of Health "ImageJ"
  • the surface (B) of the spunbonded nonwoven fabric of the present invention is composed of fibers made of the above-mentioned thermoplastic resin, similarly to the surface (A).
  • the spunbonded nonwoven fabric of the present invention is preferably made of long fibers, and the constituent fibers of the surface (B) are preferably long fibers as in the surface (A). This is because it is easy to achieve both high productivity and excellent mechanical characteristics because it is made of long fibers.
  • the average single fiber diameter of the fibers constituting the surface (B) of the spunbonded nonwoven fabric of the present invention is preferably 1.0 to 25.0 ⁇ m.
  • the average single fiber diameter of the fibers constituting the surface (B) is preferably 1.0 ⁇ m or more, more preferably 3.0 ⁇ m or more, still more preferably 5.0 ⁇ m or more. This is because when the size is 1.0 ⁇ m or more, the arrangement of the fibers does not become too dense, and when used as a material for disposable diapers, water easily transfers to the adjacent water absorber.
  • the average single fiber diameter of the fibers constituting the surface (B) is preferably 25.0 ⁇ m or less, more preferably 20.0 ⁇ m or less, still more preferably 16.0 ⁇ m or less. This is because when the thickness is 25.0 ⁇ m or less, high capillary force can be easily obtained and excellent water absorption can be obtained.
  • the degree of bending of the fibers on the surface (B) of the spunbonded nonwoven fabric of the present invention is preferably 1.1 or less, more preferably 1.0. This is because when the bending degree of the fibers on the surface (B) is 1.1 or less, it is easy to form small interfiber voids and it is easy to obtain a high capillary force.
  • the lower limit of the bending degree of the fiber on the surface (B) is 1.0, which is included when the apparent length and the length in a straight line match, which is a preferable embodiment.
  • the ratio (Da / Db) of the average single fiber diameter (Da) of one surface (A) to the average single fiber diameter (Db) of the fibers of the other surface (B), hereinafter simply " (Sometimes abbreviated as "average single fiber diameter ratio”) is 1.1 or more.
  • the average single fiber diameter ratio referred to here is the average single fiber diameter (Da) of the fibers constituting the surface (A) and the average single fiber diameter (B) of the fibers constituting the surface (B) by using the above-mentioned method. Db) is measured, the ratio (Da / Db) is calculated, and the value is rounded off to the second digit.
  • the size of the voids woven by the fibers changes according to the average single fiber diameter of the constituent fibers. Therefore, when layers with different average single fiber diameters are formed, layers with different interfiber void sizes are formed, and when moisture adheres, the layer is made of thick fibers due to the difference in capillary force. The absorbed moisture can be transferred to a layer of fine fibers. Furthermore, as a result of diligent studies, the present inventors have set this average single fiber diameter ratio within a specific range, which not only has an effect of improving water absorption due to the difference in capillary effect, but also has a rapid effect on the surface of a non-woven fabric layer made of thick fibers. It has been found that dryness is imparted.
  • the average single fiber diameter ratio (Da / Db) in the present invention is preferably 1.2 or more, more preferably 1.3 or more, and even more preferably 1.4 or more.
  • the upper limit of the average single fiber diameter ratio in the present invention is not particularly limited, but is preferably 10.0 or less from the viewpoint of process stability and productivity.
  • the spunbonded nonwoven fabric of the present invention has a fused portion and a non-fused portion.
  • the fused portion is a portion where the fiber on the surface (A) and the fiber on the surface (B) are fused
  • the non-fused portion is a portion other than that on the spunbonded nonwoven fabric. , The area surrounded by the fused part. In the fused portion, since the fiber on the surface (A) and the fiber on the surface (B) are fused, the density around the fused portion tends to be high.
  • the presence of a high-density fused portion and a relatively low-density non-fused portion in the plane of the spunbonded non-woven fabric facilitates the movement of water in the plane and is simple in the thickness direction. It is possible to facilitate the development of more efficient water absorption and quick-drying performance than the movement of water.
  • the portion is a fused portion in a part of the spunbonded nonwoven fabric, that is, a portion where the fiber on the surface (A) and the fiber on the surface (B) are fused.
  • the surface (A) is arbitrarily selected by observing an image of the cross section of the relevant portion of the spunbonded nonwoven fabric as a magnification in which the thickness direction of the spunbonded nonwoven fabric is in the field of view with a scanning electron microscope. If the surface (B) of the fused portion is fused at the same position in the plane direction, it is determined that the portion is the fused portion.
  • the diameter of the maximum inscribed circle of the non-fused portion is 2.0 mm or more.
  • the diameter of the maximum inscribed circle is more preferably 3.0 mm or more, further preferably 4.0 mm or more. This is because when the diameter of the maximum inscribed circle is 2.0 mm or more, it is easy to form a low-density portion sufficiently distant from the fused portion, so that a high water absorption rate can be easily obtained. It is also preferable in that it is easy to obtain a soft touch.
  • the diameter of the maximum inscribed circle is preferably 10.0 mm or less, more preferably 9.0 mm or less, still more preferably 8.0 mm or less. This is because when the diameter of the maximum inscribed circle is 10.0 mm or less, it is easy to suppress fluffing due to friction or the like.
  • the diameter of the maximum inscribed circle in the present invention is formed on the fused portion (11) with a microscope when the surface of the spunbonded nonwoven fabric (1) is observed from above. A field of view having a size of 10 mm ⁇ 10 mm or more in which the enclosed non-woven fabric can be observed is photographed. Then, using the captured image, the diameter of the maximum inscribed circle (13) that can be placed on the non-fused portion (12) is measured using image analysis software (for example, "WinROOF2015” manufactured by Mitani Corporation). do. This is arbitrarily extracted and measured at 20 points constituting the same surface, a simple number average is obtained, the unit is mm, and the value rounded to the second decimal place is the maximum inscribed circle of the surface in the present invention. Let it be the diameter.
  • image analysis software for example, "WinROOF2015” manufactured by Mitani Corporation
  • the spunbonded nonwoven fabric of the present invention has one surface (A) in which the average single fiber diameter of the fiber is Da and the other surface (B) in which the average single fiber diameter of the fiber is Db, as described above.
  • the average single fiber diameter ratio (Da / Db) is 1.1 or more.
  • the contact angles of the surfaces (A) and the surface (B) of the spunbonded nonwoven fabric with water are both 30 ° or less.
  • the contact angles of the front and back surfaces of the spunbonded nonwoven fabric with water are both 30 ° or less, preferably 20 ° or less, more preferably 10 ° or less, the water in contact with the surface of the spunbonded nonwoven fabric is easily absorbed by the nonwoven fabric. ..
  • the lower limit of the contact angle with water in the present invention is 0 °, but the contact angle with water of 0 ° means a state in which all the water is absorbed by the non-woven fabric in the measurement method described later.
  • the contact angle of the surface of the spunbonded nonwoven fabric with water can be controlled by the hydrophilicity of the thermoplastic resin used for the fibers constituting the spunbonded nonwoven fabric and the addition of a hydrophilic oil agent in a subsequent process.
  • the higher the hydrophilicity of the thermoplastic resin and the larger the amount of the hydrophilic oil agent adhered to the resin the smaller the contact angle with water tends to be.
  • the contact angle of the surface of the spunbonded nonwoven fabric of the present invention with water refers to a value measured and calculated by the following method.
  • the spunbonded nonwoven fabric is left in a room at room temperature of 20 ° C. and relative humidity of 65% for 24 hours or more.
  • the spunbonded nonwoven fabric subjected to the above treatment is set on the stage of the contact angle meter installed in the same room so that the surface (A) becomes the measurement surface.
  • a 2 ⁇ L droplet composed of ion-exchanged water is prepared at the needle tip and landed on a non-woven fabric.
  • the contact angle with the droplet is obtained from the image 2 seconds after the droplet has landed on the non-woven fabric.
  • the contact angle with water is defined as 0 °. .. (5)
  • the measurement position is changed for each level, and the measurement is performed 5 times, and the arithmetic mean value is taken as the contact angle between the surface (A) and water.
  • (6) Set the spunbonded non-woven fabric subjected to the same treatment as (1) so that the front surface (A) is the back surface, repeat the above operations (2) to (5), and calculate the arithmetic mean value.
  • the contact angle between the surface (B) and water is calculated.
  • the spunbonded non-woven fabric of the present invention has the highest breaking strength with respect to the lowest breaking strength ⁇ min measured by rotating in the plane of the spunbonded non-woven fabric up to 180 ° every 22.5 ° with 0 ° in any one direction.
  • the ratio of breaking strength ⁇ max ( ⁇ max / ⁇ min , hereinafter may be simply abbreviated as breaking strength ratio) is preferably 1.2 to 4.0.
  • breaking strength ratio is preferably 1.2 or more, more preferably 1.3 or more, the fibers are easily oriented in the non-woven fabric surface, and high capillary force is easily developed. Therefore, the in-plane fibers are easily developed. It is possible to obtain higher water absorption and quick-drying property by causing the movement of the fiber.
  • the breaking strength ratio to preferably 4.0 or less, more preferably 3.5 or less, an extremely low angle of breaking strength is eliminated, so that tearing of the non-woven fabric during process passage or product processing is suppressed. be able to.
  • the breaking strength ratio of the spunbonded nonwoven fabric of the present invention was measured and calculated by the following method based on "6.3 Tensile strength and elongation (ISO method)" of JIS L1913: 2010 "General nonwoven fabric test method". Point to a value.
  • ISO method Tensile strength and elongation
  • a tensile test is carried out at a tensile speed of 100 m / min, the strength [N] at break is obtained for the three collected test pieces, and the arithmetic mean value thereof is defined as the breaking strength ⁇ .
  • the axis is the direction rotated clockwise by 22.5 ° in the plane of the spunbonded nonwoven fabric with respect to any one direction set to 0 °, and the vertical direction is 300 mm in length so as to coincide with the above axial direction.
  • ⁇ Cut out a test piece with a width of 25 mm, change the location, and collect 3 test pieces. After that, the above operations (2) to (3) are performed to calculate the breaking strength ⁇ .
  • the spunbonded nonwoven fabric layer (S) and the melt blow nonwoven fabric layer (M) can be arranged according to the purpose as long as the effects of the present invention are not impaired. Examples of these arrangements include aspects such as SMS, SMMS, SMSMS, SMSMS, and the like. In these cases, one surface of the laminated nonwoven fabric is regarded as the surface (A) of the spunbonded nonwoven fabric, and the other surface is regarded as the surface (B).
  • the spunbonded nonwoven fabric of the present invention preferably has a water absorption rate of 20 seconds or less as measured on the surface (A).
  • the non-woven fabric has good performance of removing water adhering to the surface, that is, has excellent water absorption.
  • the water absorption rate referred to here is measured based on "7.1.1 Drop method” of JIS L1907: 2010 "Water absorption test method for textile products”. Drop one drop of water on the spunbonded non-woven fabric, measure the time until it is absorbed and the mirror reflection on the surface disappears, calculate the simple average of the values measured at 10 different points, and use the decimal point as the unit. The value rounded to the first decimal place is taken as the water absorption rate in the present invention.
  • the basis weight of the spunbonded nonwoven fabric of the present invention is preferably 10 to 100 g / m 2.
  • a spunbonded nonwoven fabric having mechanical strength that can be put into practical use can be obtained.
  • a spunbonded nonwoven fabric having appropriate flexibility suitable for use as a nonwoven fabric for sanitary materials can be obtained. ..
  • the spunbonded nonwoven fabric of the present invention has a texture (g / m 2 ), which is a 20 cm ⁇ 25 cm test piece based on “6.2 Mass per unit area” of JIS L1913: 2010 “General nonwoven fabric test method”. , 3 samples are taken per 1 m of width of the sample, each mass (g) in the standard state is weighed, and the mass per 1 m 2 calculated from the average value is referred to.
  • the spunbonded nonwoven fabric of the present invention may be provided with a hydrophilic agent for the purpose of increasing water absorption.
  • a hydrophilic agent for the purpose of increasing water absorption.
  • examples of the type of the hydrophilizing agent include surfactants, and among them, nonionic surfactants are preferable.
  • the spunbonded nonwoven fabric of the present invention preferably has a non-fused portion thickness (Tu) of 0.5 mm or more.
  • Tu is 0.5 mm or more, more preferably 0.7 mm or more, still more preferably 0.9 mm or more
  • the spunbonded nonwoven fabric has an appropriate cushioning property.
  • the size is 1.50 mm or less, more preferably 1.40 mm or less, still more preferably 1.30 mm or less, the spunbonded nonwoven fabric has excellent bending flexibility.
  • the thickness (Tu) of the non-fused portion of the spunbonded nonwoven fabric of the present invention is not particularly limited, but is, for example, the thickness under no load measured by a shape measuring machine (for example, "VR3050" manufactured by KEYENCE CORPORATION). To say.
  • the ratio (Tu / Tm) of the thickness of the non-fused portion (Tu) to the thickness of the fused portion (Tm) is preferably 2.0 or more, preferably 5.0 or more. Is more preferable, and 10.0 or more is further preferable.
  • Tu / Tm is 2.0 or more, the difference in density between the periphery of the fused portion and the position separated from the fused portion becomes large, and the circumference of the fused portion becomes large. This is because it is easy to achieve both high water absorption in the high-density part in the above and excellent softness in the low-density part in the remote position.
  • the upper limit is not particularly limited, but is usually 50 or less.
  • the thickness (Tm) of the fused portion of the spunbonded nonwoven fabric of the present invention is not particularly limited, but for example, a field of view in which a cross section can be observed with a microscope is photographed. Subsequently, using the captured image, the thickness is measured using image analysis software (for example, "WinROOF2015” manufactured by Mitani Corporation). This is measured at 10 arbitrarily extracted points, a simple number average is obtained, the unit is mm, and the value rounded to the third decimal place is the thickness (Tm) of the fused portion of the spunbonded nonwoven fabric in the present invention. be.
  • image analysis software for example, "WinROOF2015” manufactured by Mitani Corporation
  • the ratio (Tu / Tm) of the thickness of the non-fused portion (Tu) to the thickness of the fused portion (Tm) is obtained by dividing Tu (mm) measured and calculated by the above by Tm (mm). It shall be calculated by rounding off the second decimal place.
  • the sanitary material of the present invention is at least partially composed of the above-mentioned spunbonded nonwoven fabric. By doing so, a sanitary material having excellent water absorption and quick-drying property can be obtained.
  • the sanitary material of the present invention is mainly a disposable article used for health-related purposes such as medical treatment and long-term care, and examples thereof include disposable diapers, sanitary napkins, gauze, bandages, masks, gloves, adhesive plasters, and the like.
  • the components include, for example, top sheets, back sheets, side gathers and the like of disposable diapers.
  • the sanitary material in which the surface (A) of the spunbonded nonwoven fabric is arranged toward the skin side of the wearer can immediately absorb the moisture adhering to the skin surface side into the inside of the spunbonded nonwoven fabric. , It is more preferable because it can reduce discomfort to the wearer.
  • the sanitary material is a disposable diaper and the spunbonded non-woven fabric is placed inside the disposable diaper
  • the surface (A) is arranged toward the wearer's skin side
  • sweat or excretion generated during wearing is discharged.
  • the diaper is quickly absorbed and the liquid is rapidly transferred to the surface (B), so that the surface can be kept smooth without excessive dampness.
  • the sanitary material is a mask and the spunbonded non-woven fabric is used inside the mask
  • the surface (A) is arranged toward the wearer's skin side
  • sweat and exhalation are condensed and the skin is exposed.
  • Even if moisture adheres to the surface side it is immediately absorbed inside the spunbonded non-woven fabric and then rapidly transferred to the surface (B), leaving the skin surface smooth without excessive dampness. Can be kept.
  • the spunbonded nonwoven fabric of the present invention melts a thermoplastic resin as a raw material, spins it from a spinneret, and then cools and solidifies the yarns obtained by pulling and stretching them with an ejector on a moving net. It is manufactured by the spunbond method, which requires a step of collecting, forming a non-woven fiber web, and then heat-sealing.
  • the shape of the spinneret and ejector used various shapes such as a round shape and a rectangular shape can be adopted. Above all, from the viewpoint that the amount of compressed air used is relatively small and the threads are less likely to be fused or scratched, it is preferable to use a combination of a rectangular base and a rectangular ejector.
  • the spinning temperature is preferably (melting temperature of the raw material thermoplastic resin + 10 ° C.) or more (melting temperature of the raw material thermoplastic resin + 100 ° C.) or less.
  • the spun yarn is cooled next, but as a method of cooling the spun yarn, for example, a method of forcibly blowing cold air onto the yarn, or natural cooling at the ambient temperature around the yarn.
  • a method of adjusting the distance between the spinneret and the ejector, and the like, or a method of combining these methods can be adopted.
  • the cooling conditions can be appropriately adjusted and adopted in consideration of the discharge amount per single hole of the spinneret, the spinning temperature, the atmospheric temperature and the like.
  • the cooled and solidified yarn is towed and stretched by the compressed air ejected from the ejector.
  • the spunbonded nonwoven fabric of the present invention it is important to control the average single fiber diameter of the fibers constituting the surface (A) and the surface (B).
  • the average single fiber diameter of the fiber is determined by the discharge amount and the traction speed per the discharge hole of the spinneret, that is, the spinning speed. Therefore, it is preferable to determine the discharge amount and the spinning speed according to the desired average single fiber diameter.
  • the spinning speed is preferably 2000 m / min or more, more preferably 3000 m / min or more. By setting the spinning speed to 2000 m / min or more, high productivity can be obtained, and the orientation and crystallization of the fibers can be advanced to obtain high-strength long fibers.
  • the long fiber yarns stretched by traction in this way are collected by a moving net to form a sheet, and then subjected to a heat fusion process.
  • a composite spun fiber using a thermoplastic resin having different characteristics may be used, or depending on the degree of cooling. It is possible to control the degree of bending by forming regions with different stresses on the fiber cross section.
  • the tortuosity can be increased to 1.1 or more by using a thermoplastic resin having a large melting point difference or a thermoplastic resin having a large viscosity difference.
  • the bending degree can be made 1.1 or more by increasing the difference in cooling conditions between one side surface of the fiber and the opposite side surface.
  • a composite spun fiber using a thermoplastic resin having different properties, a single fiber, or a single fiber is used. Even for single-component spun fibers produced by blending, it is important to equalize the stress borne by the fiber cross section depending on the degree of cooling. Therefore, in the case of a composite spun fiber, the tortuosity can be reduced to 1.1 or less by using a thermoplastic resin having a small melting point difference or a thermoplastic resin having a small viscosity difference. It is also important to cool the fibers uniformly in order to reduce the bending degree to 1.1 or less.
  • the spunbonded nonwoven fabric of the present invention has a surface (A) and a surface (B) having different fiber diameters. Further, the tortuosity of the fibers constituting the surface (A) is 1.1 or more.
  • a method for obtaining such a spunbonded nonwoven fabric for example, from the spinneret for the surface (A), on the fiber web obtained by collecting on the collection net as described above, the downstream side of the collection net. It is possible to adopt a method of depositing fiber webs from the spinneret for the surface (B) arranged in the above and heat-sealing them at once to fix them.
  • a heat embossed roll having an engraving (uneven portion) on the surface of one roll and a flat without engraving on the surface of the other roll.
  • Thermal fusion methods using various rolls such as thermal embossing rolls consisting of a combination of (smooth) rolls and thermal calendar rolls consisting of a combination of upper and lower flat (smooth) rolls, and ultrasonic vibration of the horn.
  • a method by heat fusion such as ultrasonic fusion can be adopted.
  • the spunbonded nonwoven fabric of the present invention is produced by heat-sealing with an embossed roll
  • the fibers on the surface (A) and the surface (B) are fused together at the positions corresponding to the convex portions of the embossed roll. It is preferable because it is easy. Further, by designing the position of the convex portion of the embossed roll, the maximum inscribed circle of the unfused portion can be controlled, which is also a preferable embodiment.
  • a hydrophilic agent may be added to the spunbonded nonwoven fabric thus obtained before winding.
  • Examples of the method for applying the hydrophilizing agent to the spunbonded non-woven fabric include coating with kiss roll or spray, dip coating, etc., but coating with kiss roll is preferable from the viewpoint of uniformity and ease of controlling the amount of adhesion.
  • the present invention will be described in detail based on examples. However, the present invention is not limited to these examples.
  • the one without any special description is the one obtained by the measurement based on the above-mentioned method.
  • the average single fiber diameter (Da) of the fibers constituting the surface (A) and the average single fiber diameter (Db) of the fibers constituting the surface (B) are measured, the ratio (Da / Db) is calculated, and the decimal point is calculated. The value is rounded off to the second decimal place.
  • Example 1 (Fiber web forming surface (A)) Polypropylene (PP) and ethylene copolymerized polypropylene (copolymerized PP) are melted by different extruders to form side-by-side composite fibers (mass ratio 1: 1), and round holes having a hole diameter of 0.4 mm are formed. A single-hole ejection amount of 0.9 g / min was spun from the rectangular cap.
  • the average single fiber diameter of the fibers constituting the obtained surface (A) was 18.4 ⁇ m.
  • Fiber web forming surface (B) Polypropylene was melted by an extruder and spun from a rectangular mouthpiece having a round hole having a hole diameter of 0.4 mm ⁇ at a single hole discharge rate of 0.3 g / min. After the spun yarn is cooled and solidified by cold air, it is pulled and stretched by compressed air having a pressure at the ejector of 0.08 MPa in a rectangular ejector to form a surface (A) on a moving net. Collected on the textile web. The average single fiber diameter of the fibers constituting the obtained surface (B) was 10.6 ⁇ m.
  • the laminated fiber web thus obtained is made of metal on the lower roll by using a metal embossed roll arranged in a so-called quilting pattern, which is a lattice pattern in which a straight line pattern formed by a perfect circular convex portion is orthogonal to the upper roll.
  • a metal embossed roll arranged in a so-called quilting pattern, which is a lattice pattern in which a straight line pattern formed by a perfect circular convex portion is orthogonal to the upper roll.
  • heat fusion is performed at a linear pressure of 300 N / cm and a heat fusion temperature of 125 ° C., and a grain size of 40 g / m 2 .
  • a spunbonded non-woven material was obtained.
  • a nonionic surfactant was applied to the nonwoven fabric using kissroll so that the active ingredient was 0.5 wt% with respect to the weight of the spunbonded nonwoven fabric.
  • Table 1 shows the evaluation results of the obtained spunbonded non-woven fabric.
  • Example 2 A spunbonded nonwoven fabric was obtained in the same manner as in Example 1 except that a metal embossed roll in which regular circular protrusions were staggered at the same pitch in both directions of MD and CD was used for the upper roll.
  • Table 1 shows the evaluation results of the obtained spunbonded non-woven fabric.
  • Example 3 A spunbonded nonwoven fabric was obtained in the same manner as in Example 2 except that the single-hole discharge rate of the fiber web forming the surface (A) was 0.53 g / min.
  • Table 1 shows the evaluation results of the obtained spunbonded non-woven fabric.
  • Example 4 A spunbonded nonwoven fabric was obtained by the same method as in Example 1 except that the linear pressure was heat-sealed at 10 N / cm using an embossed roll.
  • Table 1 shows the evaluation results of the obtained spunbonded non-woven fabric.
  • Example 5 Examples except that the fiber web forming the surface (B) was melted with polypropylene and ethylene copolymer polypropylene by different extruders and spun out as side-by-side composite fibers (mass ratio 1: 1). A spunbonded nonwoven fabric was obtained in the same manner as in 1.
  • Table 1 shows the evaluation results of the obtained spunbonded non-woven fabric.
  • the fiber web constituting the surface (A) and the fibers and fiber webs constituting the surface (B) each have a single-hole discharge rate of 0.6 g / min, and ethylene copolymer polypropylene and the same ethylene copolymer polypropylene are used.
  • a spunbonded nonwoven fabric was obtained in the same manner as in Example 1 except that it was melted and spun by another extruder.
  • Table 2 shows the evaluation results of the obtained spunbonded non-woven fabric.
  • Example 2 instead of heat-sealing using an embossed roll, a spunbonded nonwoven fabric was obtained by the same method as in Example 1 except that the obtained fiber web was heated with hot air at 150 ° C. and heat-sealed. In the fusion with hot air, although the adjacent fibers are fused to each other, the "fused portion" in which the fibers on the surface (A) and the fibers on the surface (B) are fused is not formed.
  • Table 2 shows the evaluation results of the obtained spunbonded non-woven fabric.
  • Table 2 shows the evaluation results of the obtained spunbonded non-woven fabric.
  • the average single fiber diameter ratio (Da / Db) is large, the bending degree of the surface (A) is large, and the fibers of the surface (A) and the fibers of the surface (B) are fused together. It can be seen that it has an excellent water absorption and quick-drying property and an excellent soft feeling because it has a place where it is used.
  • Comparative Example 1 since the average single fiber diameter ratio is small, moisture is not transferred to the surface (B) side in the non-woven fabric, and the water absorption and quick-drying property are inferior. Further, in Comparative Example 2, since the fibers on the surface (A) and the fibers on the surface (B) do not have a place where both of them are fused, it is difficult for water to move into the surface, and the water absorption and quick-drying performance. Is inferior. In Comparative Example 3, since the bending degree of the surface (A) was small, it was difficult to obtain a water absorption rate, the water absorption and quick-drying performance was not sufficient, and the soft feeling was also inferior.

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Textile Engineering (AREA)
  • Vascular Medicine (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Nonwoven Fabrics (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
PCT/JP2021/018742 2020-06-15 2021-05-18 スパンボンド不織布および衛生材料 WO2021256146A1 (ja)

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JP7226659B1 (ja) * 2021-09-15 2023-02-21 東レ株式会社 スパンボンド不織布および衛生材料
WO2023042540A1 (ja) * 2021-09-15 2023-03-23 東レ株式会社 スパンボンド不織布および衛生材料

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JPH0742057A (ja) * 1993-07-30 1995-02-10 New Oji Paper Co Ltd 衛生材料の表面材に使用する不織布
WO2002061192A1 (en) * 2001-01-29 2002-08-08 Mitsui Chemicals, Inc. Non-woven fabrics of wind-shrink fiber and laminates thereof
JP2016141929A (ja) * 2015-02-04 2016-08-08 ライフェンホイザー・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング・ウント・コンパニー・コマンデイトゲゼルシャフト・マシイネンファブリーク 積層体の製造方法および積層体
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CA2871284C (en) 2010-02-10 2016-10-25 The Procter & Gamble Company Web material(s) for absorbent articles
JP6408194B1 (ja) 2017-03-15 2018-10-17 花王株式会社 積層不織布及びその製造方法並びに吸収性物品及び吸汗シート

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JPH0742057A (ja) * 1993-07-30 1995-02-10 New Oji Paper Co Ltd 衛生材料の表面材に使用する不織布
WO2002061192A1 (en) * 2001-01-29 2002-08-08 Mitsui Chemicals, Inc. Non-woven fabrics of wind-shrink fiber and laminates thereof
JP2016141929A (ja) * 2015-02-04 2016-08-08 ライフェンホイザー・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング・ウント・コンパニー・コマンデイトゲゼルシャフト・マシイネンファブリーク 積層体の製造方法および積層体
JP2020502386A (ja) * 2016-12-14 2020-01-23 ピーエフノンウーヴンズ リミテッド ライアビリティ カンパニー 液圧処理された不織布及びその製造方法
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Publication number Priority date Publication date Assignee Title
JP7226659B1 (ja) * 2021-09-15 2023-02-21 東レ株式会社 スパンボンド不織布および衛生材料
WO2023042540A1 (ja) * 2021-09-15 2023-03-23 東レ株式会社 スパンボンド不織布および衛生材料

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