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WO2025187796A1 - Tissu non tissé étirable, produit fibreux et matériau sanitaire - Google Patents

Tissu non tissé étirable, produit fibreux et matériau sanitaire

Info

Publication number
WO2025187796A1
WO2025187796A1 PCT/JP2025/008305 JP2025008305W WO2025187796A1 WO 2025187796 A1 WO2025187796 A1 WO 2025187796A1 JP 2025008305 W JP2025008305 W JP 2025008305W WO 2025187796 A1 WO2025187796 A1 WO 2025187796A1
Authority
WO
WIPO (PCT)
Prior art keywords
nonwoven fabric
stretchable
layer
elastic
stretchable nonwoven
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/JP2025/008305
Other languages
English (en)
Japanese (ja)
Other versions
WO2025187796A8 (fr
Inventor
立真 國光
翔 飯濱
哲也 横山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsui Chemicals Asahi Life Materials Co Ltd
Original Assignee
Mitsui Chemicals Asahi Life Materials Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsui Chemicals Asahi Life Materials Co Ltd filed Critical Mitsui Chemicals Asahi Life Materials Co Ltd
Publication of WO2025187796A1 publication Critical patent/WO2025187796A1/fr
Publication of WO2025187796A8 publication Critical patent/WO2025187796A8/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • 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
    • D04H3/153—Mixed yarns or filaments
    • 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
    • D04H3/16—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 filaments produced in association with filament formation, e.g. immediately following extrusion

Definitions

  • This disclosure relates to stretchable nonwoven fabrics, textile products, and sanitary materials.
  • nonwoven fabrics have been widely used for a variety of purposes due to their excellent breathability and flexibility.
  • nonwoven fabrics are required to have various properties depending on the application, and there is a demand for improvements in these properties.
  • Patent Document 1 discloses a spunbond nonwoven fabric with elastic recovery.
  • the spunbond nonwoven fabric contains long fibers made of a thermoplastic polyurethane elastomer (A) with a hardness of 75 to 85.
  • the thermoplastic polyurethane elastomer (A) contains ethylene bisoleic acid amide and/or crosslinked organic fine particles.
  • Patent Document 1 International Publication No. 2011/129433
  • a long length of spunbond nonwoven fabric may be sandwiched between multiple pairs of rolls and transported. At this time, tension may be applied to the spunbond nonwoven fabric by the multiple pairs of rolls in a direction parallel to the transport direction of the spunbond nonwoven fabric to prevent the spunbond nonwoven fabric from sagging.
  • Spunbond nonwoven fabrics with excellent stretchability tend to shrink in the width direction perpendicular to the machine direction when tension is applied in a direction parallel to the machine direction.
  • the machine direction is parallel to the warp of the spunbond nonwoven fabric (the machine direction, MD, of the nonwoven fabric) (hereinafter also referred to as the “machine direction (MD)”).
  • the width direction is parallel to the weft of the spunbond nonwoven fabric (the cross direction, CD) (hereinafter also referred to as the "cross direction (CD)”). If the spunbond nonwoven fabric shrinks too much in the width direction, it may be difficult to process the spunbond nonwoven fabric.
  • the present disclosure aims to provide stretchable nonwoven fabrics, textile products, and sanitary materials that have excellent stretch properties and reduced width shrinkage.
  • thermoplastic polyurethane elastomer A stretchable fiber containing a thermoplastic polyurethane elastomer (A); and an extensible fiber containing a thermoplastic resin (B) different from the thermoplastic polyurethane elastomer (A), Including, the content of the thermoplastic polyurethane elastomer (A) is 25% by mass to 39% by mass relative to the total amount of the elastic nonwoven fabric; The 5% tensile strength per unit area of the elastic nonwoven fabric is 0.20 [N / 50 mm / gsm] or more, The 5% tensile strength indicates the load required to pull the stretchable nonwoven fabric in the machine direction (MD) of the stretchable nonwoven fabric until the elongation rate reaches 5%.
  • MD machine direction
  • ⁇ 2> At least one elastic spunbond nonwoven fabric layer containing the elastic fiber; At least one extensible spunbond nonwoven fabric layer comprising the extensible fibers;
  • the stretchable nonwoven fabric according to ⁇ 1> comprising: ⁇ 3> The stretchable nonwoven fabric according to ⁇ 2>, wherein the ratio of the basis weight of the extensible spunbonded nonwoven fabric layer to the basis weight of the stretchable nonwoven fabric is 15% to 35%.
  • ⁇ 4> The stretchable nonwoven fabric according to ⁇ 2> or ⁇ 3>, wherein the stretchable spunbonded nonwoven fabric layer is a surface layer.
  • ⁇ 5> The stretchable nonwoven fabric according to any one of ⁇ 2> to ⁇ 4>, wherein the stretchable spunbonded nonwoven fabric layer is included in an intermediate layer.
  • thermoplastic resin (B) contains at least one of polyethylene and a propylene-based polymer.
  • thermoplastic resin (B) contains at least one of polyethylene and a propylene-based polymer.
  • the basis weight of the stretchable nonwoven fabric is 10 gsm to 120 gsm.
  • a textile product comprising the stretchable nonwoven fabric according to any one of ⁇ 1> to ⁇ 7>.
  • ⁇ 9> A hygiene material comprising the stretchable nonwoven fabric according to any one of ⁇ 1> to ⁇ 7>.
  • One aspect of the present disclosure provides stretchable nonwoven fabrics, textile products, and sanitary materials that have excellent stretch properties and reduced width shrinkage.
  • FIG. 1 is a schematic diagram of a gear stretching device.
  • each component may contain multiple corresponding substances.
  • the amount of each component in a composition in the present disclosure if multiple substances corresponding to each component are present in the composition, the total amount of the multiple substances present in the composition is meant unless otherwise specified.
  • the term "process” refers not only to an independent process, but also to a process that cannot be clearly distinguished from other processes, as long as the purpose of the process is achieved.
  • a numerical range indicated using “to” indicates a range that includes the numerical values before and after "to” as the minimum and maximum values, respectively.
  • the content of each component in a composition means the total amount of the multiple substances present in the composition, unless otherwise specified, when the composition contains multiple substances corresponding to each component.
  • “gsm” is synonymous with g/ m2 .
  • the stretchable nonwoven fabric of the present disclosure comprises stretchable fibers containing a thermoplastic polyurethane elastomer (A) (hereinafter also referred to as “TPU (A)”) and extensible fibers containing a thermoplastic resin (B) (hereinafter also referred to as “TR (B)”) different from the thermoplastic polyurethane elastomer (A).
  • the content of the thermoplastic polyurethane elastomer (A) (hereinafter also referred to as "TPU content”) is 25% to 39% by mass based on the total weight of the stretchable nonwoven fabric.
  • the 5% tensile strength per basis weight of the stretchable nonwoven fabric is 0.20 [N/50 mm/gsm] or greater.
  • the 5% tensile strength refers to the load required to pull the stretchable nonwoven fabric in the machine direction (MD) of the stretchable nonwoven fabric (hereinafter also referred to as "machine direction (MD)") until the stretchable nonwoven fabric reaches an elongation of 5%.
  • MD machine direction
  • the 5% tensile strength of the stretchable nonwoven fabric is measured using the same method as described in the Examples.
  • elastic nonwoven fabric refers to a nonwoven fabric that has elastic properties.
  • Nonwoven fabric refers to a flat fiber assembly that has a predetermined level of structural strength obtained by at least one of physical and chemical methods, excluding weaving, knitting, and papermaking.
  • Nonwoven fabric with elastic properties refers to a nonwoven fabric that has the property of recovering to its pre-stretched shape when stress is released after the nonwoven fabric is stretched due to its elastic properties.
  • a nonwoven fabric with elastic properties refers to a nonwoven fabric whose stress at 50% elongation relative to the stress at 50% recovery is 4.0 or less.
  • the term “elastic fiber” refers to a fiber that can be used to produce an elastic nonwoven fabric (in other words, a fiber that imparts elastic properties to a nonwoven fabric).
  • the term “elastic fiber” can also be referred to as a fiber made of a thermoplastic resin composition that makes up the elastic nonwoven fabric.
  • the term “extendable fiber” refers to a fiber that can be used to produce an extensible nonwoven fabric (in other words, a fiber that imparts extensibility to a nonwoven fabric).
  • the fibers constituting the extensible nonwoven fabrics disclosed in WO 2017/006972, WO 2019/146656, WO 2020/158875, and WO 2022/210047 are preferred examples of the extensible fiber.
  • Extensible nonwoven fabric refers to a nonwoven fabric that has extensibility.
  • Extensible nonwoven fabric refers to a nonwoven fabric that has a first property and a second property.
  • First property refers to the property that when an external force is applied to the nonwoven fabric, the outer shape of the nonwoven fabric stretches in one direction.
  • Second property refers to the property that even when the external force applied to the nonwoven fabric is released, the outer shape of the nonwoven fabric does not easily return to its original shape.
  • an extensible nonwoven fabric has an elongation rate of 50% or more, preferably 70% or more, and more preferably 100% or more, and has the property of hardly recovering its stretchability.
  • Elongation rate refers to the ratio of the increase in length due to elongation to the natural length in an unstretched state.
  • Machine direction (MD) of a stretchable nonwoven refers to the direction in which a moving screen travels when the stretchable nonwoven comprises a spunbond nonwoven.
  • spunbond nonwoven fabric refers to a nonwoven fabric made by one or more bonding methods to a spunlaid web.
  • spunlaid web refers to a web laminated by spunlay lamination.
  • spunlay lamination refers to a method of making a web by extruding molten or dissolved polymers through a nozzle, stretching the filaments with cooled air, and laminating them on a moving screen.
  • the stretchable nonwoven fabric of the present disclosure has the above-described configuration, resulting in excellent stretchability and suppressed width shrinkage.
  • cross direction (CD) of the elastic nonwoven fabric will also be referred to simply as “cross direction (CD).”
  • cross direction (CD) of the elastic nonwoven fabric refers to the direction perpendicular to the direction in which the moving screen travels.
  • the stretch nonwoven fabric comprises a spunbond nonwoven fabric
  • it can be determined from the stretch nonwoven fabric itself by measuring the tensile strength of the stretch nonwoven fabric in the machine direction (MD).
  • MD machine direction
  • the moving speed of the screen is set to a high speed from the viewpoint of productivity. Therefore, the long fibers contained in the web tend to be oriented in a direction parallel to the machine direction (MD) when laminated on the screen.
  • the tensile strength of the elastic nonwoven fabric in the machine direction (MD) is higher than the tensile strength of the elastic nonwoven fabric in the cross direction (CD). Therefore, by measuring the tensile strength of the elastic nonwoven fabric, the machine direction (MD) can be determined from the elastic nonwoven fabric itself.
  • the 5% tensile strength per unit area of the stretchable nonwoven fabric is 0.20 [N/50 mm/gsm] or more, and from the viewpoint of imparting flexibility while suppressing width shrinkage, it is preferably 0.20 [N/50 mm/gsm] to 0.80 [N/50 mm/gsm], more preferably 0.22 [N/50 mm/gsm] to 0.70 [N/50 mm/gsm], and even more preferably 0.25 [N/50 mm/gsm] to 0.60 [N/50 mm/gsm].
  • the reason for focusing on the 5% tensile strength per unit area of the stretchable nonwoven fabric in order to suppress width shrinkage of the stretchable nonwoven fabric is to quantitatively evaluate the tensile strength at small elongation rates. At tensile strengths of 10% or more, the stretchable nonwoven fabric may yield due to tensile deformation, making it difficult to accurately evaluate the Young's modulus of the stretchable nonwoven fabric.
  • the technical significance of a stretchable nonwoven fabric having a high 5% tensile strength per unit area is that it is a stretchable nonwoven fabric that is resistant to deformation even when an external force is applied (i.e., a stiff stretchable nonwoven fabric).
  • Methods for adjusting the 5% tensile strength per unit weight of a stretchable nonwoven fabric to 0.20 [N/50 mm/gsm] or more include, for example, increasing the proportion of high tensile stiffness fibers in the entire stretchable nonwoven fabric, making the stretchable nonwoven fabric a "mixed fiber configuration of stretchable fibers and extensible fibers," making the stretchable nonwoven fabric a "layer configuration including a stretchable spunbond nonwoven fabric layer and an extensible spunbond nonwoven fabric layer,” "arranging high tensile stiffness fibers somewhere in the thickness direction of the stretchable nonwoven fabric,” adjusting the type and content of resin used for the extensible fibers, and adjusting the unit weight of each layer.
  • the stretch ratio of the elastic nonwoven fabric is preferably 4.0 or less.
  • the stretch ratio indicates the ratio of the stress ( S1 ) of the elastic nonwoven fabric at 50% elongation to the stress ( S2 ) of the elastic nonwoven fabric at 50% recovery (hereinafter also referred to as "( S1 / S2 )").
  • the stretch ratio of the elastic nonwoven fabric is more preferably more than 1.5 and not more than 3.0, and even more preferably more than 1.5 and not more than 2.5.
  • the method for measuring the stretch ratio of the stretchable nonwoven fabric is the same as that described in the examples.
  • Methods for adjusting the stretch ratio of an elastic nonwoven fabric to 4.0 or less include, for example, increasing the proportion of thermoplastic elastomer fibers, making the elastic nonwoven fabric a "mixed fiber configuration of elastic fibers and extensible fibers," making the elastic nonwoven fabric a "layer configuration including an elastic spunbond nonwoven fabric layer and an extensible spunbond nonwoven fabric layer,””arranging fibers with high tensile rigidity somewhere in the thickness direction of the elastic nonwoven fabric,” adjusting the type and content of resin used in the elastic fibers, and adjusting the basis weight of each layer.
  • Increasing the amount of thermoplastic elastomer reduces the 5% tensile strength.
  • the TPU content is preferably 25% to 39%.
  • the ratio of the basis weight of the extensible spunbonded nonwoven fabric layer to the basis weight of the stretchable nonwoven fabric may be 15% to 50%, more preferably 15% to 40%, and even more preferably 15% to 35%.
  • both the stretch properties and the 5% tensile strength are improved. It is believed that by setting the TPU content within the above range and by partially bundling the extensible fibers in the thickness direction of the stretchable nonwoven fabric, an improvement in the 5% tensile strength was observed while maintaining stretchability.
  • the proportion (mass %) of extensible fibers in the entire stretchable nonwoven fabric is preferably more than 60% and not more than 75%, and more preferably more than 60% and not more than 70%.
  • the tensile strength in the machine direction (MD) of the elastic nonwoven fabric (hereinafter also referred to as "tensile strength") is not particularly limited, and is selected appropriately depending on the application and basis weight of the elastic nonwoven fabric.
  • the basis weight of the elastic nonwoven fabric is 10 gsm to 30 gsm
  • the tensile strength of the elastic nonwoven fabric may be 5 N/50 mm or more and less than 35 N/50 mm.
  • the tensile strength of the stretchable nonwoven fabric is more preferably 35 N/50 mm or more and less than 65 N/50 mm.
  • the tensile strength of the elastic nonwoven fabric is preferably 65 N/50 mm to 180 N/50 mm, more preferably 80 N/50 mm to 120 N/50 mm. If the tensile strength of the elastic nonwoven fabric is 5 N/50 mm or more, the elastic nonwoven fabric can be prevented from breaking when tension in the machine direction (MD) is applied to the elastic nonwoven fabric. From this perspective, the tensile strength of the elastic nonwoven fabric is preferably 15 N/50 mm or more, and more preferably 25 N/50 mm or more. The tensile strength of the stretchable nonwoven fabric can be measured by the same method as described in the examples. Methods for adjusting the tensile strength include orienting the fibers in the machine direction (MD), increasing the fusion between fibers, and increasing the basis weight ratio of the extensible spunbond nonwoven fabric layer.
  • the elongation percentage in the machine direction (MD) of the elastic nonwoven fabric (hereinafter also referred to as "elongation percentage") is not particularly limited and is selected appropriately depending on the application of the elastic nonwoven fabric.
  • the elongation percentage of the elastic nonwoven fabric is preferably 100% to 400%, more preferably 120% to 300%.
  • breakage of the stretchable nonwoven fabric can be suppressed when tension in the machine direction (MD) is applied to the stretchable nonwoven fabric, and breakage of the stretchable nonwoven fabric can also be suppressed during gear processing.
  • the method for measuring the elongation of the elastic nonwoven fabric is the same as that described in the examples.
  • the method for adjusting the elongation percentage to 100% to 400% is to make the elongation of all fibers constituting the elastic nonwoven fabric 100% or more.
  • the stretchable nonwoven fabric is a sheet-like material. There are no particular limitations on the type of stretchable nonwoven fabric.
  • the elastic nonwoven fabric preferably includes a spunbond nonwoven fabric.
  • the elastic nonwoven fabric may include other nonwoven fabrics other than the spunbond nonwoven fabric, such as woven fabrics, knitted fabrics, and paper.
  • the other nonwoven fabric may be a staple fiber nonwoven fabric or a long fiber nonwoven fabric
  • examples of the other nonwoven fabric include wet-laid nonwoven fabrics, dry-laid nonwoven fabrics, air-laid nonwoven fabrics, dry pulp nonwoven fabrics, carded nonwoven fabrics, parallel nonwoven fabrics, cross nonwoven fabrics, random nonwoven fabrics, spun-laid nonwoven fabrics, melt-blown nonwoven fabrics, flash-spun nonwoven fabrics, chemical-bonded nonwoven fabrics, hydroentangled nonwoven fabrics, needle-punched nonwoven fabrics, stitch-bonded nonwoven fabrics, and thermal-bonded nonwoven fabrics.
  • the basis weight of the stretchable nonwoven fabric is preferably 10 gsm to 120 gsm, and is selected appropriately depending on the application of the stretchable nonwoven fabric. From the viewpoint of achieving both flexibility and stretchability, the basis weight of the stretchable nonwoven fabric is more preferably 20 gsm to 100 gsm, and even more preferably 25 gsm to 90 gsm.
  • the method for measuring the basis weight of the stretchable nonwoven fabric is the same as the method described in the examples.
  • the thickness of the stretchable nonwoven fabric is not particularly limited and is selected appropriately depending on the intended use of the stretchable nonwoven fabric.
  • the thickness of the stretchable nonwoven fabric is preferably 0.10 mm to 5.00 mm, more preferably 0.15 mm to 3.00 mm, and even more preferably 0.20 mm to 1.00 mm.
  • an appropriate thickness can be selected depending on the intended use of the stretchable nonwoven fabric.
  • the thickness of the elastic nonwoven fabric was measured by the same method as described in the examples.
  • the TPU content is 25% to 39% by mass, which allows for both 5% tensile strength and stretchability.
  • the TPU content is more preferably 29% to 38% by mass, and even more preferably 33% to 37% by mass, from the viewpoint of achieving both 5% tensile strength and stretchability.
  • the elastic nonwoven fabric may also contain other fibers that are different from each of the elastic fibers and extensible fibers.
  • the layer structure of the stretchable nonwoven fabric is appropriately selected depending on the intended use of the stretchable nonwoven fabric, and may be a single-layer structure made of a mixed fiber nonwoven fabric, or a multi-layer structure.
  • “Mixed fiber nonwoven fabric” refers to a nonwoven fabric in which fibers of different resins are mixed during the spinning stage.
  • the stretchable nonwoven fabric has a multi-layer structure, it is preferable that the stretchable nonwoven fabric has at least one layer of mixed fiber nonwoven fabric.
  • the stretchable nonwoven fabric may also include other layers, which will be described later.
  • the elastic nonwoven fabric preferably includes at least one elastic spunbond nonwoven fabric layer (hereinafter also referred to as "elastic SB layer”) and at least one extensible spunbond nonwoven fabric layer (hereinafter also referred to as "extensible SB layer”).
  • the elastic SB layer includes the elastic fiber.
  • the extensible SB layer includes the extensible fiber.
  • the stretchable SB layer of the stretchable nonwoven fabric is preferably a mixed fiber nonwoven fabric.
  • the term “elastic spunbond nonwoven fabric layer” refers to a spunbond nonwoven fabric layer having elastic properties. Specifically, the term “elastic spunbond nonwoven fabric layer” refers to a spunbond nonwoven fabric layer having a ratio of the stress at 50% elongation to the stress at 50% recovery (stress at 50% elongation/stress at 50% recovery) of 4.0 or less.
  • the term “extensible spunbond nonwoven fabric layer” refers to a spunbond nonwoven fabric layer that has extensibility. The extensible spunbond nonwoven fabric layer has an elongation rate of 50% or more, preferably 70% or more, and more preferably 100% or more, and has almost no stretching properties.
  • a stretchable nonwoven fabric comprising a stretchable SB layer and an extensible SB layer will also be referred to as a "stretchable nonwoven fabric laminate.”
  • the stretchable nonwoven fabric laminate of the present disclosure is constructed to include a stretchable SB layer and an extensible SB layer, thereby making it possible to further suppress width shrinkage while maintaining stretch properties. This effect is presumably due to, but not limited to, the following reasons.
  • the stretchable nonwoven fabric laminate includes an extensible SB layer, deformation tends to be less likely to occur up to a larger tensile load.
  • the width shrinkage of the stretchable nonwoven fabric is thought to be caused by Poisson deformation, and the results of this disclosure have shown that Poisson deformation can be controlled by changing the balance of the arrangement of various fibers in the thickness direction.
  • the elastic nonwoven fabric laminate When the elastic nonwoven fabric laminate includes an elastic SB layer and an extensible SB layer, the elastic nonwoven fabric laminate may have a two-layer structure, a three-layer structure, or a four or more layer structure.
  • the stretchable nonwoven fabric laminate When the stretchable nonwoven fabric laminate has a three-layer structure, the stretchable nonwoven fabric laminate may be a first laminate or a second laminate. The first laminate is formed by laminating an extensible SB layer, an extensible SB layer, and an extensible SB layer in this order. The second laminate is formed by laminating an extensible SB layer, an extensible SB layer, and an extensible SB layer in this order.
  • the stretchable nonwoven fabric laminate may be formed by laminating at least one of an extensible SB layer and an extensible SB layer on a three-layer first laminate, or by laminating at least one of an extensible SB layer and an extensible SB layer on a three-layer second laminate.
  • the balance between the stretch properties and width shrinkage can be further improved by making the TPU content in the stretchable SB layer higher than the TPU content in the extensible SB layer.
  • the TPU content in the extensible SB layer is 0% by mass or more and less than 20% by mass, and that the TPU content in the stretchable SB layer is 40% by mass or more and 70% by mass or less.
  • an even more preferred embodiment is one in which the TPU content in the stretchable SB layer is 0% by mass or more and less than 10% by mass, and the TPU content in the stretchable SB layer is 40% by mass or more and 60% by mass or less. Also, an even more preferred embodiment is one in which the TPU content of each layer is within the above-mentioned range, and the TPU content in the stretchable nonwoven fabric laminate and the basis weight ratio of the stretchable SB layer are within the ranges of the present disclosure.
  • the stretchable nonwoven fabric laminate includes a plurality of stretchable SB layers, the configuration of each of the plurality of stretchable SB layers may be the same or different.
  • the configuration of each of the plurality of extensible SB layers may be the same or different.
  • the method for measuring the TPU content in the stretchable SB layer and the extensible SB layer is as follows.
  • the stretchable nonwoven fabric laminate is solidified with a resin other than the thermoplastic resin (TPU and polyolefin resin) used as the raw material for the stretchable nonwoven fabric.
  • the solidified product is divided so that the interface between the stretchable SB layer and the extensible SB layer of the solidified product forms the cut surface. By eluting the TPU from each of the resulting multiple divisions, the TPU content of the stretchable SB layer and the TPU content of the extensible SB layer can be calculated.
  • the machine direction (MD) of the elastic SB layer is the same as the machine direction (MD) of the extensible SB layer
  • the cross direction (CD) of the elastic SB layer is the same as the cross direction (CD) of the extensible SB layer.
  • the stretchable SB layer is the surface layer.
  • the wearer of the stretchable nonwoven fabric laminate is less likely to experience discomfort (e.g., a sticky feeling).
  • partial adhesion of the stretchable nonwoven fabric to the gear stretching machine is suppressed. As a result, processability can be improved.
  • the stretchable nonwoven fabric laminate includes a second laminate
  • the stretchable SB layer is included in the intermediate layer.
  • an extensible spunbond nonwoven fabric layer in the intermediate layer of the stretchable nonwoven fabric laminate, the contractile forces of both nonwoven fabric surface layers in the lamination direction of the stretchable nonwoven fabric laminate during stretching become more equal, making the stretchable nonwoven fabric laminate less likely to curl.
  • the stretchable nonwoven fabric laminate is more likely to maintain a flat shape and is easier to handle.
  • the "intermediate layer of the stretchable nonwoven fabric laminate” refers to a layer other than the two outer layers in a stretchable nonwoven fabric laminate consisting of three or more layers.
  • the basis weight ratio (i.e., composition ratio) of the elastic SB layer to the extensible SB layer of the elastic nonwoven fabric laminate is appropriately selected depending on the application of the elastic nonwoven fabric laminate.
  • the ratio of the basis weight of the extensible SB layer to the basis weight of the elastic SB layer is preferably 15/85 to 50/50, more preferably 15/85 to 40/60, and even more preferably 15/85 to 35/65.
  • the basis weight of the stretchable SB layers refers to the sum of the basis weights of the multiple stretchable SB layers.
  • the basis weight of the extensible SB layers refers to the sum of the basis weights of the multiple extensible SB layers.
  • the elastic SB layer contains elastic fibers.
  • the elastic SB layer may consist of only elastic fibers, or may further contain fibers other than the elastic fibers (e.g., extensible fibers) in addition to the elastic fibers.
  • the elastic SB layer is preferably composed of elastic fibers and extensible fibers. This allows the elastic nonwoven fabric laminate to be less susceptible to adhesion to processing machines and stickiness to the skin during use, which can be prevented compared to when the elastic SB layer is composed only of elastic fibers.
  • the content of TPU (A) relative to the total amount of the elastic SB layer is preferably 10% by mass to 90% by mass, thereby improving the elasticity properties of the elastic nonwoven fabric laminate.
  • the content of TPU (A) is more preferably 20% by mass or more, and even more preferably 30% by mass or more.
  • the content of TPU (A) is more preferably 70% by mass or less, and even more preferably 60% by mass or less.
  • the content of TPU (A) in the elastic SB layer is preferably 40% by mass or more and 70% by mass or less, and more preferably 40% by mass or more and 60% by mass or less.
  • the content of the TPU (A) in the extensible SB layer is preferably 0% by mass or more and less than 20% by mass, and more preferably 0% by mass or more and less than 10% by mass.
  • the basis weight per layer of the stretchable SB layer may be 2 gsm to 120 gsm, 2 gsm to 40 gsm, or 12 gsm to 37 gsm.
  • the method for measuring the basis weight of the stretchable SB layer is the same as the method for measuring the basis weight described in the examples.
  • the stretchable SB layer contains stretchable fibers.
  • the stretchable SB layer preferably contains more than 90% by mass and not more than 100% by mass of stretchable fibers, and more preferably consists solely of stretchable fibers.
  • the stretchable SB layer may further contain fibers other than the stretchable fibers (e.g., elastic fibers) in an amount of less than 10% by mass relative to the mass of the stretchable SB layer.
  • the extensible fibers included in the elastic SB layer and the extensible fibers in the extensible SB layer may be fibers of the same resin composition or fibers of different resin compositions.
  • the resin compositions of each layer are all polyolefin-based resin compositions, and it is preferable that the difference in melting points of the polyolefin-based resin compositions of the extensible fibers in each layer be 30 degrees or less.
  • the content of the thermoplastic resin (B) contained in the extensible SB layer is preferably 80% by mass or more and 100% by mass or less, more preferably 90% by mass or more and 100% by mass or less, and even more preferably 100% by mass, relative to the total amount of the extensible spunbond nonwoven fabric layer. This allows for a 5% increase in tensile strength.
  • the basis weight per layer of the stretchable SB layer may be 2 gsm to 120 gsm, 2 gsm to 40 gsm, or 12 gsm to 37 gsm.
  • the method for measuring the basis weight of the stretchable SB layer is the same as the method for measuring the basis weight described in the examples.
  • the ratio of the basis weight of the extensible SB layer to the basis weight of the stretchable nonwoven fabric is preferably 15% to 35%. This allows the stretchable nonwoven fabric laminate to have superior 5% tensile strength and excellent stretch properties.
  • the weight ratio (stretchable SB layer) is more preferably 17% or more, and even more preferably 20% or more, from the viewpoint of improving the 5% tensile strength.
  • the weight ratio (stretchable SB layer) is more preferably 40% or less, even more preferably 35% or less, and particularly preferably 30% or less, from the viewpoint of not excessively reducing the stretchability.
  • the elastic fiber comprises TPU (A).
  • the average fiber diameter of the elastic fiber is preferably 60 ⁇ m or less, more preferably 50 ⁇ m or less, and even more preferably 40 ⁇ m or less.
  • the average fiber diameter of the elastic fiber is preferably 1 ⁇ m or more, more preferably 10 ⁇ m or more, and even more preferably 20 ⁇ m or more.
  • the average fiber diameter of elastic fibers was measured using the following method. Ten 10mm x 10mm test pieces were taken from the elastic nonwoven fabric, and the fiber diameter was read in ⁇ m units to the first decimal place using a Nikon ECLIPSE E400 microscope at 20x magnification. The diameter was measured at 20 random points on each test piece, and the average value was the average fiber diameter.
  • the elastic fiber may be a long fiber or a short fiber. From the standpoint of 5% strength, the elastic fiber is preferably a long fiber spunbond nonwoven fabric.
  • the cross-sectional shape of the elastic fiber is not particularly limited, and examples include approximately circular, elliptical, and irregular shapes.
  • the stretchable fiber may be a bicomponent fiber or a monocomponent fiber.
  • the bicomponent fiber is preferably made of two or more thermoplastic resins.
  • Examples of composite fibers include sheath-core, side-by-side, islands-in-sea, and side-by-side types.
  • Sheath-core composite fibers have only to have a core and a sheath, and may be either a concentric sheath-core type or an eccentric sheath-core type.
  • Eccentric sheath-core composite fibers may have the core exposed on the surface, or may not have the core exposed on the surface.
  • Islands-in-sea composite fibers have a sea phase and multiple island phases.
  • TPU (A) The elastic fiber contains TPU (A), or may consist solely of TPU (A).
  • TPU (A) may be a known thermoplastic polyurethane elastomer.
  • Thermoplastic polyurethane elastomer (A) is preferably a thermoplastic polyurethane elastomer (hereinafter also referred to as "TPU (a)”) having a hardness (JIS K-7311: Type A durometer) in the range of 70 to 90 (preferably 75 to 85, more preferably 80 to 83) and containing at least one of ethylene bisoleic acid amide and crosslinked organic fine particles.
  • Thermoplastic polyurethane elastomers are also collectively referred to as "TPU.”
  • the stretchable nonwoven fabric will have certain stretch properties even if it contains extensible fibers.
  • the mass average molecular weight (Mw) of the TPU (a) is preferably 125,000 to 200,000, more preferably 130,000 to 180,000.
  • the melt viscosity of the TPU (a) is preferably 0.9 ⁇ 10 4 (dPa ⁇ s) to 1.4 ⁇ 10 4 (dPa ⁇ s).
  • Polyol Polyol is one of the components constituting TPU (a).
  • Polyol is a polymer having two or more hydroxyl groups in one molecule.
  • examples of polyols include polyester polyols, polyoxyalkylene polyols, polytetramethylene ether glycols, polycaprolactone polyols, polycarbonate diols, etc. These polyols may be used alone or in combination of two or more.
  • the polyester polyol can be obtained, for example, by condensation polymerization of at least one low-molecular-weight polyol and at least one carboxylic acid (for example, a low-molecular-weight dicarboxylic acid or oligomeric acid).
  • low molecular weight polyols include ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, glycerin, trimethylolpropane, 3-methyl-1,5-pentanediol, hydrogenated bisphenol A, and hydrogenated bisphenol F.
  • low molecular weight dicarboxylic acids examples include glutaric acid, adipic acid, sebacic acid, terephthalic acid, isophthalic acid, and dimer acid.
  • the number average molecular weight of the polyester polyol is preferably 500 to 4,000.
  • Polyoxyalkylene polyols can be obtained, for example, by addition polymerization of alkylene oxides (such as propylene oxide, ethylene oxide, butylene oxide, and styrene oxide) to at least one relatively low molecular weight dihydric alcohol.
  • alkylene oxides such as propylene oxide, ethylene oxide, butylene oxide, and styrene oxide
  • the number average molecular weight of the polyoxyalkylene polyol is preferably 200 to 8,000.
  • Tetramethylene ether glycol can be obtained by ring-opening polymerization of tetrahydrofuran.
  • the number average molecular weight of the tetramethylene ether glycol is preferably 250 to 4,000.
  • Polycaprolactone polyol is obtained by ring-opening polymerization of ⁇ -caprolactone.
  • Polycarbonate diols are obtained by a condensation reaction between a dihydric alcohol (for example, 1,4-butanediol, 1,6-hexanediol, etc.) and a carbonate compound (for example, dimethyl carbonate, diethyl carbonate, diphenyl carbonate, etc.).
  • a dihydric alcohol for example, 1,4-butanediol, 1,6-hexanediol, etc.
  • a carbonate compound for example, dimethyl carbonate, diethyl carbonate, diphenyl carbonate, etc.
  • the number average molecular weight of the polycarbonate diol is preferably 500 to 3,000.
  • the isocyanate compound is one of the components constituting the TPU (a).
  • the isocyanate compound has two or more isocyanate groups in one molecule.
  • Examples of the isocyanate compound include aromatic aromatic polyisocyanates, aliphatic aromatic polyisocyanates, and alicyclic aromatic polyisocyanates.
  • aromatic polyisocyanates include: 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, an isomer mixture of tolylene diisocyanate in a mass ratio (2,4-isomer:2,6-isomer) of 80:20 (TDI-80/20), and an isomer mixture of tolylene diisocyanate in a mass ratio (2,4-isomer:2,6-isomer) of 65:35 (TDI-65/35); 4,4'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate, 2,2'-diphenylmethane diisocyanate, and any isomeric mixtures of these diphenylmethane diisocyanates; Examples include toluylene diisocyanate, xylylene diisocyanate, tetramethylxylylene diisocyanate, paraphenylene diisocyanate, and naphthalene
  • Aliphatic polyisocyanates include, for example, ethylene diisocyanate, trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, octamethylene diisocyanate, nonamethylene diisocyanate, 2,2'-dimethylpentane diisocyanate, 2,2,4-trimethylhexane diisocyanate, decamethylene diisocyanate, butene diisocyanate, 1,3-butadiene-1,4-diisocyanate, 2,4,4-trimethylhexamethylene diisocyanate, 1,6,11-undecamethylene triisocyanate, 1,3,6-hexamethylene triisocyanate, 1, Examples include 8-diisocyanate-4-isocyanate methyl octane, 2,5,7-trimethyl-1,8-diisocyanate-5-isocyanate methyl octane, bis(isocyanate ethyl
  • alicyclic polyisocyanates include isophorone diisocyanate, bis(isocyanatomethyl)cyclohexane, dicyclohexylmethane diisocyanate, cyclohexane diisocyanate, methylcyclohexane diisocyanate, 2,2'-dimethyldicyclohexylmethane diisocyanate, dimer acid diisocyanate, 2,5-diisocyanatomethyl-bicyclo[2.2.1]-heptane, 2,6-diisocyanatomethyl-bicyclo[2.2.1]-heptane, 2-isocyanatomethyl-2-(3-isocyanatopropyl)-5-isocyanatomethyl-bicyclo[2.2.1]-heptane, 2-isocyanatomethyl-2-(3-isocyanatopropyl)-5-isocyanatomethyl-bicyclo[2.2.1]-heptane, Examples include 2-isocyanate
  • polyisocyanates examples include modified isocyanates (e.g., urethane-modified, carbodiimide-modified, uretoimine-modified, biuret-modified, allophanate-modified, and isocyanurate-modified polyisocyanates).
  • modified isocyanates e.g., urethane-modified, carbodiimide-modified, uretoimine-modified, biuret-modified, allophanate-modified, and isocyanurate-modified polyisocyanates.
  • the chain extender is used in the production of TPU (a).
  • the chain extender is preferably an aliphatic, aromatic, heterocyclic, or alicyclic low-molecular-weight polyol having two or more hydroxyl groups per molecule.
  • Examples of the aliphatic polyol include ethylene glycol, propylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, glycerin, and trimethylolpropane.
  • aromatic, heterocyclic, or alicyclic polyols include paraxylene glycol, bis(2-hydroxyethyl)terephthalate, bis(2-hydroxyethyl)isophthalate, 1,4-bis(2-hydroxyethoxy)benzene, 1,3-bis(2-hydroxyethoxy)benzene, resorcinol, hydroquinone, 2,2'-bis(4-hydroxycyclohexyl)propane, 3,9-bis(1,1-dimethyl-2-hydroxyethyl)-2,4,8,10-tetraoxaspiro[5.5]undecane, 1,4-cyclohexanedimethanol, and 1,4-cyclohexanediol.
  • chain extenders may be used alone or in combination of two or more.
  • Ethylene bisoleamide is one of the components added to TPU (a).
  • Ethylene bisoleamide is a compound obtained from ethylenediamine and oleic acid.
  • the amount of ethylene bisoleamide added is usually 0.3 to 2.0% by mass, preferably 0.4 to 0.8% by mass, based on the TPU (a).
  • Crosslinked organic fine particles are one of the components added to TPU (a).
  • Crosslinked organic fine particles are fine particles that do not melt when TPU (a) is melt-spun.
  • the average particle size of the crosslinked organic fine particles is usually 0.5 ⁇ m to 8 ⁇ m, preferably 1 ⁇ m to 4 ⁇ m.
  • the crosslinked organic fine particles can be obtained, for example, by polymerizing at least one specific compound and a crosslinking agent.
  • Specific compounds include, for example: (meth)acrylates such as (meth)acrylic acid, methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, iso-propyl (meth)acrylate, n-butyl (meth)acrylate, iso-butyl (meth)acrylate, t-butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, cyclohexyl (meth)acrylate, benzyl (meth)acrylate, hydroxyethyl (meth)acrylate, and hydroxypropyl (meth)acrylate; Styrenics such as styrene, p-methylstyrene, vinyltoluene, and p-t-butylstyrene;
  • crosslinking agents include: polyfunctional (meth)acrylates such as ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, and bishydroxyethyl bisphenol A di(meth)acrylate; Radically polymerizable crosslinking agents such as divinyloxyethoxy (meth)acrylate, diallyl phthalate, allyl (meth)acrylate, and divinylbenzene; polyfunctional epoxy compounds such as bisphenol A diglycidyl ether, diethylene glycol diglycidyl ether, and neopentyl glycol diglycidyl ether; polyfunctional isocyanate compounds such as tolylene diisocyanate, xylylene diisocyanate, and isophorone diisocyanate; Examples include N-methylol melamine and N
  • the elastic fiber may or may not contain a known thermoplastic elastomer, as long as the object of the present disclosure is not impaired.
  • thermoplastic elastomer examples include polystyrene elastomers, polyolefin elastomers, polyvinyl chloride elastomers, polyester elastomers, polyamide elastomers, and thermoplastic polyurethane elastomers other than the above TPU (a).
  • the stretchable fiber may or may not contain known additives, as long as the purpose of the present disclosure is not impaired.
  • additives include antioxidants, heat stabilizers, weather stabilizers, antistatic agents, slip agents, anti-fogging agents, lubricants, dyes, pigments, natural oils, synthetic oils, and waxes.
  • antioxidants examples include hindered phenol-based antioxidants, fatty acid metal salts, and polyhydric alcohol fatty acid esters.
  • hindered phenol antioxidants include 2,6-di-t-butyl-4-methylphenol (BHT), pentaerythritol tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate] (manufactured by Ciba Corporation: trade name Irganox 1010), 6-(3,5-di-t-butyl-4-hydroxyphenyl)propionic acid alkyl ester, and 2,2′-oxamidobis[ethyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)]propionate.
  • BHT 2,6-di-t-butyl-4-methylphenol
  • Irganox 1010 pentaerythritol tetrakis[3-(3,5-di-t-butyl
  • fatty acid metal salts include zinc stearate, calcium stearate, and calcium 1,2-hydroxystearate.
  • polyhydric alcohol fatty acid esters include glycerin monostearate, glycerin distearate, pentaerythritol monostearate, pentaerythritol distearate, and pentaerythritol tristearate. These may be used alone or in combination of two or more.
  • the extendable fiber includes TR(B).
  • the average fiber diameter of the extendable fiber is preferably 50 ⁇ m or less, more preferably 40 ⁇ m or less, and even more preferably 30 ⁇ m or less.
  • the average fiber diameter of the extendable fiber is preferably 1 ⁇ m or more, more preferably 10 ⁇ m or more, and even more preferably 15 ⁇ m or more.
  • the method for measuring the average fiber diameter of extendable fibers is the same as the method for measuring the average fiber diameter of elastic fibers.
  • the extensible fibers may be long fibers or short fibers. From the standpoint of 5% strength, the extensible fibers are preferably long fiber spunbond nonwoven fabrics.
  • the cross-sectional shape of the extensible fibers is not particularly limited, and examples include approximately circular, elliptical, and irregular cross sections.
  • the extendable fiber may be a bicomponent fiber or a monocomponent fiber.
  • the bicomponent fiber is preferably made of two or more thermoplastic resins.
  • Examples of composite fibers include sheath-core, side-by-side, islands-in-sea, and side-by-side types.
  • Sheath-core composite fibers have only to have a core and a sheath, and may be either a concentric sheath-core type or an eccentric sheath-core type.
  • Eccentric sheath-core composite fibers may have the core exposed on the surface, or may not have the core exposed on the surface.
  • Islands-in-sea composite fibers have a sea phase and multiple island phases.
  • the extensible fiber contains TR(B) or may consist of TR(B) alone.
  • TR(B) may be a known thermoplastic resin.
  • TR (B) is a polymer different from TPU (a).
  • TR (B) is usually a crystalline polymer having a melting point (Tm) of 100° C. or higher, or an amorphous polymer having a glass transition temperature of 100° C. or higher.
  • TR (B) is preferably a crystalline thermoplastic resin.
  • TR(B) is preferably a homopolymer or copolymer of an ⁇ -olefin (eg, ethylene, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene, etc.).
  • ⁇ -olefin eg, ethylene, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene, etc.
  • TR(B) examples include polyolefins, polyesters (e.g., polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate), polyamides (e.g., nylon-6, nylon-66, and polymetaxylene adipamide), polyvinyl chloride, polyimides, ethylene-vinyl acetate copolymers, ethylene-vinyl acetate-vinyl alcohol copolymers, ethylene-(meth)acrylic acid copolymers, ethylene-acrylic acid ester-carbon monoxide copolymers, polyacrylonitrile, polycarbonate, polystyrene, ionomers, and mixtures thereof.
  • polyesters e.g., polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate
  • polyamides e.g., nylon-6, nylon-66, and polymetaxylene adipamide
  • polyvinyl chloride polyimi
  • polyolefins examples include polyethylene (e.g., high-pressure low-density polyethylene, linear low-density polyethylene (LLDPE), and high-density polyethylene (HDPE)), propylene polymers (e.g., propylene homopolymer, polypropylene random copolymer, ethylene-propylene random copolymer, and propylene-1-butene random copolymer), poly-1-butene, poly-4-methyl-1-pentene, and ethylene-1-butene random copolymer.
  • polyethylene e.g., high-pressure low-density polyethylene, linear low-density polyethylene (LLDPE), and high-density polyethylene (HDPE)
  • propylene polymers e.g., propylene homopolymer, polypropylene random copolymer, ethylene-propylene random copolymer, and propylene-1-butene random copolymer
  • poly-1-butene poly-4-
  • polyethylene e.g., high-pressure low-density polyethylene, linear low-density polyethylene, high-density polyethylene, etc.
  • propylene polymers e.g., propylene homopolymers and polypropylene random copolymers, etc.
  • polyethylene terephthalate polyamide, etc.
  • the thermoplastic resin (B) preferably contains at least one of polyethylene and a propylene-based polymer, and more preferably contains a propylene-based polymer and high-density polyethylene (HDPE).
  • HDPE high-density polyethylene
  • the propylene polymer may be a propylene homopolymer having a melting point (Tm) of 155° C. or higher (preferably 157 to 165° C.).
  • the propylene polymer is preferably a copolymer of a propylene homopolymer having a melting point (Tm) of 155° C. or higher (preferably 157 to 165° C.) and a very small amount of at least one ⁇ -olefin.
  • the at least one ⁇ -olefin may, for example, be ethylene, 1-butene, 1-pentene, 1-hexene, 1-octene, or 4-methyl-1-pentene.
  • the melt flow rate (MFR: ASTM D-1238, 230°C, load 2160 g) of the propylene polymer is not particularly limited as long as it can be melt-spun, but is usually 1 g/10 min to 1000 g/10 min, preferably 5 g/10 min to 500 g/10 min, and more preferably 10 g/10 min to 100 g/10 min.
  • the ratio (Mw/Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) of the propylene polymer is usually 1.5 to 5.0. From the viewpoint of obtaining fibers with good spinnability and particularly excellent fiber strength, the ratio (Mw/Mn) is more preferably in the range of 1.5 to 3.0.
  • Mw and Mn can be measured by a known method such as GPC (gel permeation chromatography).
  • the polyethylene in TR (B) preferably contains high-density polyethylene (HDPE).
  • HDPE high-density polyethylene
  • the content of high-density polyethylene (HDPE) is preferably 1% to 20% by mass, more preferably 2% to 15% by mass, and even more preferably 4% to 10% by mass, relative to 100% by mass of the total of the propylene polymer and high-density polyethylene (HDPE).
  • the density of the high density polyethylene (HDPE) added to the propylene polymer is not particularly limited, and is preferably 0.94 g/cm 3 to 0.97 g/cm 3 , more preferably 0.95 g/cm 3 to 0.97 g/cm 3 , and even more preferably 0.96 g/cm 3 to 0.97 g/cm 3.
  • the melt flow rate (MFR: ASTM D-1238, 190°C, load 2160 g) of the high density polyethylene (HDPE) is preferably 0.1 g/10 min to 100 g/10 min, more preferably 0.5 g/10 min to 50 g/10 min, and even more preferably 1 g/10 min to 30 g/10 min.
  • the extendable fiber may or may not contain known additives, as long as the object of the present disclosure is not impaired.
  • additives include antioxidants, heat stabilizers, weather stabilizers, antistatic agents, slip agents, anti-fogging agents, lubricants, dyes, pigments, natural oils, synthetic oils, and waxes.
  • antioxidants examples include hindered phenol-based antioxidants, fatty acid metal salts, and polyhydric alcohol fatty acid esters.
  • hindered phenol antioxidants include 2,6-di-t-butyl-4-methylphenol (BHT), pentaerythritol tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate] (manufactured by Ciba Corporation: trade name Irganox 1010), 6-(3,5-di-t-butyl-4-hydroxyphenyl)propionic acid alkyl ester, and 2,2′-oxamidobis[ethyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)]propionate.
  • BHT 2,6-di-t-butyl-4-methylphenol
  • Irganox 1010 pentaerythritol tetrakis[3-(3,5-di-t-butyl
  • fatty acid metal salts include zinc stearate, calcium stearate, and calcium 1,2-hydroxystearate.
  • polyhydric alcohol fatty acid esters include glycerin monostearate, glycerin distearate, pentaerythritol monostearate, pentaerythritol distearate, and pentaerythritol tristearate. These may be used alone or in combination of two or more.
  • the stretchable nonwoven fabric may or may not have other layers depending on the application.
  • Examples of other layers include knitted fabrics, woven fabrics, nonwoven fabrics other than the stretchable SB layer and the extensible SB layer, and films.
  • the method for further laminating another layer on the nonwoven fabric is not particularly limited, and examples thereof include embossing, heat fusion (e.g., ultrasonic fusion, etc.), mechanical entanglement (e.g., needle punching, water jet, etc.), methods using adhesives (e.g., hot melt adhesives, urethane-based adhesives, etc.), and extrusion lamination.
  • nonwoven fabric When the elastic nonwoven fabric has a nonwoven fabric other than the elastic SB layer and the extensible SB layer, examples of the nonwoven fabric include spunbond nonwoven fabric, meltblown nonwoven fabric, wetlaid nonwoven fabric, drylaid nonwoven fabric, drylaid pulp nonwoven fabric, flash-spun nonwoven fabric, and spread nonwoven fabric, etc. As long as the effects of the present disclosure are achieved, these nonwoven fabrics may be elastic or non-elastic nonwoven fabric.
  • non-elastic nonwoven fabric refers to a fabric that does not generate a return stress after being stretched in the machine direction (MD) or cross direction (CD).
  • a breathable film When imparting breathability to a stretchable nonwoven fabric containing other layers, it is preferable to use a breathable (in other words, moisture-permeable) film as the film.
  • breathable films include moisture-permeable films and porous films.
  • the moisture-permeable film is made of a thermoplastic elastomer (for example, a polyurethane-based elastomer, a polyester-based elastomer, or a polyamide-based elastomer).
  • the porous film is made by stretching a film made of a thermoplastic resin containing inorganic or organic fine particles to make it porous.
  • the thermoplastic resin used for the porous film is preferably a polyolefin, such as high-pressure low-density polyethylene, linear low-density polyethylene (so-called LLDPE), high-density polyethylene, propylene polymers, polypropylene random copolymers, and combinations thereof.
  • a non-porous film can be used.
  • a film of a thermoplastic resin e.g., polyethylene, propylene polymer, or a combination thereof
  • a thermoplastic resin e.g., polyethylene, propylene polymer, or a combination thereof
  • Stretchable nonwoven fabrics may be used in combination with elastic members (e.g., elastic threads, etc.).
  • elastic members e.g., elastic threads, etc.
  • stretchable nonwoven fabric By placing a stretchable elastic member (e.g., elastic threads, etc.) on the stretchable nonwoven fabric, the stretchable nonwoven fabric has even better stretch properties and fit than when no elastic member is combined with the stretchable nonwoven fabric.
  • Stretch sheets that combine stretchable nonwoven fabrics with elastic threads are less likely to wrinkle due to shrinkage of the elastic member than when no elastic member is combined with the stretchable nonwoven fabric. As a result, the stretch sheet also has an excellent feel against the skin.
  • the form of the elastic member include threads (e.g., rubber threads) and strings (e.g., flat rubber).
  • the elastic member may be a strip of elastic film or elastic nonwoven fabric, a thermoplastic resin fiber, or an elastic suture.
  • materials for the elastic member include synthetic rubber (e.g., styrene-butadiene, butadiene, isoprene, neoprene, etc.), natural rubber, ethylene vinyl acetate copolymer (EVA), elastic polyolefin, and polyurethane.
  • the elastic thread may be bonded by any known method (e.g., welding with an adhesive, thermocompression bonding, or sewing).
  • thermoplastic resin used in the present disclosure may be derived from a biomass-derived raw material. Because biomass-derived raw materials are carbon-neutral materials, the environmental impact of producing spunbond nonwoven fabrics can be reduced. Monomers that serve as raw materials for biomass-derived thermoplastic resins can be obtained by cracking biomass naphtha or synthesizing them from biomass-derived ethylene. The biomass-derived thermoplastic resins can be obtained by polymerizing the biomass-derived monomers synthesized in this manner using a method similar to that used for conventionally known petroleum-derived thermoplastic resins.
  • a thermoplastic resin polymer synthesized using a bio-derived monomer as a raw material is a biomass-derived thermoplastic polymer.
  • the content of the bio-derived thermoplastic polymer in the raw material monomer is more than 0 mass% relative to the total amount of the raw material monomer, and may be 100 mass% or less.
  • the "biomass content” indicates the content of carbon derived from biomass and is calculated by measuring radioactive carbon (C14). Carbon dioxide in the atmosphere contains a certain proportion of C14 (approximately 105.5 pMC). Therefore, it is known that the C14 content in plants (e.g., corn) that grow by absorbing carbon dioxide from the atmosphere is also approximately 105.5 pMC. It is also known that fossil fuels contain almost no C14.
  • the thermoplastic polymer used as a raw material in the present disclosure may include a thermoplastic polymer obtained by recycling, that is, a so-called recycled polymer.
  • the term "recycled polymer” includes polymers obtained by recycling waste polymer products, and can be produced, for example, by the method described in DE 10 2019 127 827 (A1).
  • the recycled polymer may contain a marker that identifies it as having been obtained by recycling.
  • the applications of the stretchable nonwoven fabric of the present disclosure are not particularly limited, and include, for example, clothing materials (e.g., dustproof materials, supporters, interlinings, and adhesive interlinings), building materials (e.g., roofing materials and tufted carpet substrates), civil engineering goods (e.g., drain materials and filtration materials), vehicle materials (e.g., automobile interiors and automobile parts), hygiene materials (e.g., diapers, sanitary products, cosmetic sheets, first aid supplies, cleaning supplies, masks, poultices, bandages, protective clothing, surgical gowns, and coverings, etc.), interior (e.g., carpets, furniture components, fittings, wall coverings, and decorative items, etc.), bedding (e.g., futon bags, pillowcases, and sheets, etc.), agricultural materials (e.g., greenhouse sheets, weed control sheets, and seedbed sheets, etc.), leather (e.g., artificial leather base fabrics and synthetic leather base fabrics, etc.), daily necessities (e.g., storage items, packaging
  • the elastic nonwoven fabric of the present disclosure may be stretched. This improves the stretch properties of the elastic nonwoven fabric.
  • the stretching method is not particularly limited, and conventionally known methods can be used.
  • the stretching method may be a partial stretching method or a full stretching method.
  • the stretching method may be a uniaxial stretching method or a biaxial stretching method.
  • the stretching method may be a single-stage stretching method or a multi-stage stretching (multiple stretching).
  • An example of a method for stretching in the machine direction (MD) is a method in which partially fused mixed fibers are passed through two or more nip rolls (hereinafter also referred to as "Method A").
  • Method A the partially fused nonwoven fabric can be stretched by increasing the rotation speed of the nip rolls in the machine flow direction.
  • Gear stretching can also be performed using the gear stretching device shown in Figure 1.
  • the stretching ratio is preferably 50% or more, more preferably 100% or more, and even more preferably 200% or more.
  • the stretching ratio is preferably 1000% or less, and more preferably 500% or less.
  • uniaxial stretching it is preferable that either the stretching ratio in the machine direction (MD) or the stretching ratio in the cross direction (CD) satisfy the above stretching ratio.
  • biaxial stretching it is preferable that at least one of the stretching ratios in the machine direction (MD) or the cross direction (CD) satisfy the above stretching ratio.
  • both the stretchable fiber and the extendable fiber are drawn.
  • the extendable fiber undergoes plastic deformation and is elongated in accordance with the draw ratio (i.e., the extendable fiber becomes longer).
  • the stretchable fibers regain their stretchability, while the extensible fibers fold without regaining their stretchability, resulting in a bulky feel in the stretchable nonwoven fabric.
  • the extensible fibers tend to become thinner. This is thought to improve the flexibility and feel of the stretchable nonwoven fabric, as well as provide the stretch-resistance function to the stretchable nonwoven fabric.
  • the textile products of the present disclosure include the elastic nonwoven fabric of the present disclosure.
  • the textile products are not particularly limited and can be used for the applications listed above.
  • applications suitable for use as elastic members or stretchable members include hygiene materials (masks, diapers, sanitary products, individually wrapped sheets, cosmetic sheets, face masks, bandages, supports, antibacterial sheets, medical products using stretchable members on the cuffs or neck, antibacterial gloves, antibacterial hats, protective clothing, robot gowns, dustproof materials, medical drapes, machine table covers, and poultry covers), stretchable sheets, pillowcases, packaging materials, cleaning sheets, wallpaper, ceiling materials, floor materials, filtration materials, sound-absorbing materials, cushioning materials, furniture covers, weed control sheets, seedbed sheets, and fruit covers.
  • hygiene materials masks, diapers, sanitary products, individually wrapped sheets, cosmetic sheets, face masks, bandages, supports, antibacterial sheets, medical products using stretchable members on the cuffs or neck, antibacterial gloves, antibacterial hats, protective clothing, robot gowns, dustproof materials
  • the sanitary materials of the present disclosure include the stretchable nonwoven fabric of the present disclosure.
  • the sanitary materials include, but are not limited to, masks, diapers, sanitary products, individually wrapped sheets, cosmetic sheets, face masks, bandages, supports, antibacterial sheets, medical products using stretchable materials on the cuffs or neck, antibacterial gloves, antibacterial hats, protective clothing, robot gowns, dustproof materials, medical drapes, machine table covers, and poultices.
  • Thickness The thickness of the test piece for which the basis weight was measured was measured at five points, namely the center and four corners, using a thickness meter (manufactured by PEACOCK, product number "R1-250", measuring probe 25 mm ⁇ ) at a load of 7 g/ m2 . The thickness of 10 samples for which the basis weight was measured was measured using this method. The average value was taken as the "thickness (mm)".
  • the value obtained by dividing the 5% tensile strength in the machine direction (MD) by the basis weight of the elastic nonwoven fabric laminate was defined as the "5% tensile strength per basis weight (N/50 mm/gsm)" in the machine direction (MD).
  • Elongation The elongation was measured in accordance with JIS L 1913:2010. Five test pieces measuring 200 mm in length and 50 mm in width were taken from the elastic nonwoven fabric laminate. Using a tensile tester (manufactured by Intesco, product number "IM-201"), the test pieces were placed in the chuck so that they did not slacken and the load indicated by the tensile tester was 0.0 N. The test pieces were pulled in the machine direction (MD) at a chuck distance of 100 mm and a pulling speed of 100 mm/min. A load was applied to the test pieces until they broke. The elongation at the maximum load of the test piece was read. The average of the five measurements was taken as the "elongation (%)" in the machine direction (MD).
  • MD machine direction
  • the "width shrinkage rate” refers to the ratio of the width reduction due to elongation at the center of the machine direction (MD) of the test piece to the width of the unstretched test piece.
  • the load when the width shrinkage rate was 50% was divided by the basis weight of the elastic nonwoven fabric laminate to obtain the "strength when width is reduced by 50% (N/50 mm/gsm)."
  • An acceptable strength when width is reduced by 50% is 0.60 N/50 mm/gsm or more.
  • the width of the center of the machine direction (MD) of the test piece (length in the cross direction (CD)) with the load applied to the test piece was recorded.
  • the strength (the load applied to the test piece divided by the basis weight of the elastic nonwoven fabric laminate) was calculated by plotting the width of the center of the test piece in the machine direction (MD) against the strength. As a result, it was found that the obtained width decreased linearly when the strength was 0.1 N/50 mm/gsm or more.
  • the width shrinkage rate was calculated, and the slope obtained from the load applied to the test piece and the width shrinkage rate was determined as the "ease of width shrinkage of the gear stretched product (N/50 mm/gsm)" (hereinafter also referred to as “ease of width shrinkage”).
  • the "width shrinkage rate” indicates the ratio of the width reduction due to stretching to the width of the unstretched test piece at the center of the machine direction (MD) of the test piece. The larger the value of the ease of width shrinkage, the less likely the width is to shrink. If the allowable ease of width shrinkage is 2.0 N/50 mm/gsm or more, the stretch nonwoven fabric is easy to process.
  • the ease of width shrinkage is preferably 2.5 N/50 mm/gsm or more, and more preferably greater than 3.0 N/50 mm/gsm.
  • TPU 71.7 parts by mass of polyester polyol having a number average molecular weight of 1932, 4.8 parts by mass of 1,4-butanediol (BD), 0.3 parts by mass of pentaerythritol tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate] (antioxidant), and 0.3 parts by mass of polycarbondiimide were mixed, and 22.9 parts by mass of 4,4'-diphenylmethane diisocyanate (MDI) was added thereto. The mixture was thoroughly mixed with stirring at high speed, and then reacted at 160°C for 1 hour.
  • MDI 4,4'-diphenylmethane diisocyanate
  • This reaction product was pulverized, and then 100 parts by mass of the pulverized product was mixed with 0.8 parts by mass of ethylene bisstearic acid amide, 0.5 parts by mass of triethylene glycol-bis-[3-3,5-di-t-butyl-4-hydroxyphenyl)propionate] (antioxidant), and 0.8 parts by mass of ethylene bisoleic acid amide (EOA), and the mixture was melt-kneaded and granulated in an extruder (set temperature: 210° C.).
  • This produced a thermoplastic polyurethane elastomer (A-1) (hereinafter also referred to as "TPU (A-1)") as TPU (A).
  • TR (B) 94 parts by mass of propylene homopolymer and 6 parts by mass of high-density polyethylene were mixed.
  • the MFR of the propylene homopolymer (measured in accordance with ASTM D1238 at 230°C and a load of 2.16 kg) was 60 g/10 min, the density was 0.91 g/ cm3 , and the melting point was 160°C.
  • the MFR of the high-density polyethylene (measured in accordance with ASTM D1238 at 190°C and a load of 2.16 kg) was 5 g/10 min, the density was 0.97 g/ cm3 , and the melting point was 134°C.
  • Example 1 [3.1.1] Production of mixed fiber spunlaid web TPU (A-1) and TR (B-1) were melted using two independent extruders. Then, using a spunbond nonwoven fabric molding machine equipped with a spinneret, melt spinning was performed by the spunbonding method under the following conditions: resin temperature and die temperature were both 205°C, cooling air temperature was 24°C, and stretching air velocity was 3,500 m/min. As a result, a first-layer spunlaid web was deposited on a screen.
  • the first-layer spunlaid web was composed of a mixed long fiber composition containing a long fiber (A-1) (stretchable fiber) made of TPU (A-1) and a long fiber (B-1) (extensible fiber) made of TR (B-1).
  • A-1 stretchable fiber
  • B-1 extendensible fiber
  • the spinneret had a nozzle pattern in which discharge holes for TPU (A-1) and discharge holes for TR (B-1) were arranged alternately.
  • the nozzle diameter for TPU (A-1) (long fiber (A-1)) was 0.75 mm ⁇ .
  • the nozzle diameter for TR (B-1) (long fiber (B-1)) was 0.6 mm ⁇ .
  • the nozzle pitch in the vertical direction was 8 mm.
  • the nozzle pitch in the horizontal direction was 11 mm.
  • the ratio of the number of nozzles (nozzles for long fiber (A-1)/nozzles for long fiber (B-1)) was 1/1.44.
  • the single-hole discharge rate for long fiber (A-1) was 0.90 g/hole/min.
  • the single-hole discharge rate for long fiber (B-1) was 0.71 g/hole/min.
  • the second layer of spunlaid web was deposited on top of the first layer of spunlaid web using the same method as for forming the first layer of spunlaid web.
  • the second layer of spunlaid web consisted of a blend of long fibers containing long fibers (A-1) (elastic fibers) and long fibers (B-1) (extensible fibers). This resulted in a web laminate (two layers).
  • the nozzle pattern of the spinneret was the same as that of the spinneret used to produce the mixed fiber spunlaid web.
  • the single-hole output rate of the continuous fiber (B-1) was 0.66 g/hole/min.
  • Example 2 A stretchable nonwoven fabric laminate was produced in the same manner as in Example 1, except that the first and third layers were changed to spunlaid webs made of a blend of long fibers of long fiber (A-1) and long fiber (B-1), and the second layer was changed to a spunlaid web made of long fiber (B-1).
  • Example 3 A stretchable nonwoven fabric laminate was produced in the same manner as in Example 1, except that the single-hole output rate during production of the spunlaid web made of long fiber (B-1) was changed to 0.48 g/hole/min and the stretching air velocity during production of the spunlaid web made of long fiber (B-1) was changed to 3100 m/min.
  • Example 4 A stretchable nonwoven fabric laminate was produced in the same manner as in Example 1, except that the single-hole output rate during production of the spunlaid web made of long fiber (B-1) was changed to 0.57 g/hole/min and the stretching air velocity during production of the spunlaid web made of long fiber (B-1) was changed to 3600 m/min.
  • Example 5 A stretchable nonwoven fabric laminate was produced in the same manner as in Example 1, except that the screen speed was changed so that the basis weight of the stretchable nonwoven fabric laminate would be 28 gsm.
  • Example 6 A stretchable nonwoven fabric laminate was produced in the same manner as in Example 1, except that the screen speed was changed so that the basis weight of the stretchable nonwoven fabric laminate would be 41 gsm.
  • Example 7 A stretchable nonwoven fabric laminate was produced in the same manner as in Example 1, except that the single-hole throughput rate of the long fiber (A-1) and the single-hole throughput rate of the long fiber (B-1) in producing a mixed fiber spunlaid web were changed to 0.97 g/hole/min and 0.67 g/hole/min, respectively.
  • Example 8 A stretchable nonwoven fabric laminate was produced in the same manner as in Example 7, except that the screen speed was changed so that the basis weight of the stretchable nonwoven fabric laminate would be 70 gsm.
  • Example 9 A stretchable nonwoven fabric laminate was produced in the same manner as in Example 7, except that the screen speed was changed so that the basis weight of the stretchable nonwoven fabric laminate would be 79 gsm.
  • Comparative Example 1 An elastic nonwoven fabric laminate was produced in the same manner as in Example 1, except that webs made of a mixed long fiber of long fiber (A-1) and long fiber (B-1) were laminated from the first layer to the third layer, and no spunlaid web made of long fiber (B-1) was laminated.
  • Comparative Example 2 A stretchable nonwoven fabric laminate was produced in the same manner as in Comparative Example 1, except that the through-put rates of the long fiber (A-1) and the long fiber (B-1) per hole were changed to 0.77 g/hole/min and 0.80 g/hole/min, respectively, during the production of a mixed fiber spunlaid web.
  • Comparative Example 3 A stretchable nonwoven fabric laminate was produced in the same manner as in Comparative Example 1, except that the screen speed was changed so that the basis weight of the stretchable nonwoven fabric laminate would be 29 gsm.
  • Comparative Example 4 A stretchable nonwoven fabric laminate was produced in the same manner as in Comparative Example 1, except that the single-hole throughput rates of the long fiber (A-1) and the long fiber (B-1) during the production of a mixed fiber spunlaid web were changed to 0.97 g/hole/min and 0.67 g/hole/min, respectively, and the screen speed was changed so that the basis weight of the stretchable nonwoven fabric laminate would be 71 gsm.
  • Comparative Example 5 A stretchable nonwoven fabric laminate was produced in the same manner as in Comparative Example 4, except that the screen speed was changed so that the basis weight of the stretchable nonwoven fabric laminate would be 80 gsm.
  • Elastic SB refers to an elastic spunbond nonwoven fabric layer.
  • Extensible SB refers to an extensible spunbond nonwoven fabric layer.
  • Comparative Examples 1 to 5 the 5% tensile strength per unit area weight of the stretchable nonwoven fabric laminate was not 0.20 [N/50 mm/gsm] or more. Therefore, the strength (N/50 mm/gsm) at 50% reduction in width in Comparative Examples 1 to 5 was not 0.60 N/50 mm/gsm or more.
  • the stretchable nonwoven fabric laminate contained a stretchable fiber (long fiber (A-1)) and an extensible fiber (long fiber (B-1)).
  • the TPU content was 25% by mass to 39% by mass relative to the total amount of the stretchable nonwoven fabric laminate.
  • the 5% tensile strength per basis weight of the stretchable nonwoven fabric laminate was 0.20 [N/50 mm/gsm] or more. Therefore, the stretch ratios of Examples 1 to 9 were 4.0 or less.
  • the strength (N/50 mm/gsm) at 50% width reduction of Examples 1 to 9 was 0.60 N/50 mm/gsm or more.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Nonwoven Fabrics (AREA)
  • Laminated Bodies (AREA)

Abstract

Un tissu non tissé étirable selon la présente invention comprend : des fibres étirables qui contiennent un élastomère de polyuréthane thermoplastique (A) ; et des fibres extensibles qui contiennent une résine thermoplastique (B) différente de l'élastomère de polyuréthane thermoplastique (A). La quantité contenue de l'élastomère de polyuréthane thermoplastique (A) est comprise entre 25 et 39 % en masse par rapport à la quantité totale du tissu non tissé étirable. La résistance à la traction à 5 % par masse surfacique du tissu non tissé étirable est de 0,20 [N/50 mm/gsm] ou plus. La résistance à la traction de 5 % indique la charge requise pour tirer le tissu non tissé étirable jusqu'à ce que le pourcentage d'allongement atteigne 5 % dans le sens machine (MD) du tissu non tissé étirable.
PCT/JP2025/008305 2024-03-07 2025-03-06 Tissu non tissé étirable, produit fibreux et matériau sanitaire Pending WO2025187796A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0693551A (ja) * 1991-11-25 1994-04-05 Kanebo Ltd 伸縮性繊維シート及びその製造方法
WO2007138733A1 (fr) * 2006-05-31 2007-12-06 Mitsui Chemicals, Inc. stratifiÉ de tissu non tissÉ et procÉdÉ DE fabrication de celui-ci
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
WO2016143833A1 (fr) * 2015-03-09 2016-09-15 三井化学株式会社 Stratifié de tissu non tissé, stratifié de tissu non tissé étirable, produit de fibre, article absorbant et masque hygiénique
WO2019188134A1 (fr) * 2018-03-30 2019-10-03 三井化学株式会社 Stratifié de tissu non tissé, stratifié de tissu non tissé étirable, produit textile, article absorbant et masque hygiénique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0693551A (ja) * 1991-11-25 1994-04-05 Kanebo Ltd 伸縮性繊維シート及びその製造方法
WO2007138733A1 (fr) * 2006-05-31 2007-12-06 Mitsui Chemicals, Inc. stratifiÉ de tissu non tissÉ et procÉdÉ DE fabrication de celui-ci
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
WO2016143833A1 (fr) * 2015-03-09 2016-09-15 三井化学株式会社 Stratifié de tissu non tissé, stratifié de tissu non tissé étirable, produit de fibre, article absorbant et masque hygiénique
WO2019188134A1 (fr) * 2018-03-30 2019-10-03 三井化学株式会社 Stratifié de tissu non tissé, stratifié de tissu non tissé étirable, produit textile, article absorbant et masque hygiénique

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