Nonwoven fabric, nonwoven fabric laminate and article thereof

Nonwoven fabrics with crimped composite fibers and specific propylene polymers address the lack of bulkiness and visual appeal in existing spunbond fabrics, enhancing absorption and durability to improve diaper performance and baby comfort.

JP7669401B2Active Publication Date: 2025-04-28TORAY ADVANCED MATERIALS KOREA INC
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Patent Information

Application Number
JP2022579828
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2020-07-09
Filing Date
2021-07-07
Publication Date
2025-04-28
Estimated Expiration
2041-07-07

AI Technical Summary

Technical Problem

Existing spunbond nonwoven fabrics used in diapers lack sufficient bulkiness and visual appeal, leading to discomfort for babies and issues like urine leakage and skin irritation.

Method used

The development of nonwoven fabrics with improved bulkiness and visual properties, achieved through the use of crimped composite fibers made from specific propylene polymers and a hydrophilic agent, resulting in enhanced absorption, compressive strength, and handleability.

Benefits of technology

The nonwoven fabrics exhibit improved bulkiness, visual appeal, and functional properties such as increased absorption and durability, reducing urine leakage and skin irritation in babies.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present invention relates to a nonwoven fabric, a nonwoven fabric laminate, and an article thereof, wherein the nonwoven fabric has a sieve function value represented by the following mathematical formula 1 of 2.0 to 65.9%: [Formula 1] Sieving function value (%) = (final weight of powder remaining on the nonwoven fabric after the sieving test) / (initial weight of powder used in the sieving test) × 100
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Description

[Technical field]

[0001] The present invention relates to a nonwoven fabric, a nonwoven fabric laminate, and an article made thereof, and more particularly to a nonwoven fabric, a nonwoven fabric laminate, and an article made thereof, which have improved bulkiness and visibility. [Background technology]

[0002] The final physical properties of nonwoven fabrics are determined by the method of forming and bonding the web.

[0003] In the production of existing spunbond nonwoven fabrics, the web is formed through single-spun yarns or through core-sheath type composite spun yarns. The web thus formed has a simple structure without crimps and is bonded by a heated calendar to form a thin nonwoven fabric.

[0004] Thin nonwoven fabrics are used for the top sheet and back sheet of diapers when they are manufactured, but they have problems in that they are significantly less bulky and less soft than short fiber air-through nonwoven fabrics, which are made by forming a web by carding and bonding it with hot air.

[0005] In addition, the web is not crimped during formation, resulting in poor bulkiness, the area that comes into direct contact with the baby's bottom skin during diaper manufacturing is large, and there is no space between the top sheet and the ADL (Acquisition Distribution Layer) during nonwoven lamination, resulting in some urine remaining on the top sheet during urination, causing sores on the baby's bottom or inducing a rash. Another problem is that urine leaks outside the diaper.

[0006] In addition, as the market for sanitary products such as diapers becomes increasingly high-end, existing spunbond nonwoven fabrics have limitations in terms of enhancing bulkiness and visibility and providing a point of differentiation. Summary of the Invention [Problem to be solved by the invention]

[0007] One embodiment of the present invention provides a nonwoven fabric having improved bulkiness and visibility.

[0008] Another embodiment of the present invention provides a nonwoven fabric laminate comprising two or more sheets of the nonwoven fabric.

[0009] Yet another embodiment of the present invention provides an article comprising the nonwoven laminate. [Means for solving the problem]

[0010] One aspect of the present invention is The sieve function value represented by the following formula 1 is 2.0 to 65.9%: [Formula 1] Sieve function value (%) = (final weight of powder remaining on the nonwoven fabric after sieving test) / (initial weight of powder used in sieving test) x 100

[0011] The nonwoven fabric also has a sieve function value of 2.0 to 15.7%.

[0012] The nonwoven fabric also has an average hole size of 0.411 to 0.833 mm.

[0013] The nonwoven fabric also has an absorbency of 2.0 to 11.4 sec.

[0014] The nonwoven fabric has a handle-ometer value in the MD direction of 3.1 to 5.1 g, and a handle-ometer value in the CD direction of 1.0 to 2.3 g.

[0015] The nonwoven fabric also has a compressive strength of 3.4 to 6.4 cN.

[0016] Another aspect of the present invention is The nonwoven fabric laminate has a layer structure of at least two layers, at least one of which is the above-mentioned nonwoven fabric.

[0017] The nonwoven fabric is a spunbonded nonwoven fabric, and the nonwoven fabric laminate is configured such that the spunbonded nonwoven fabric is exposed on only one of the two surface layers.

[0018] Yet another aspect of the present invention is An article is provided that includes the nonwoven laminate.

[0019] The article may also be a diaper, an absorbent product, a single-use hygiene product, a toilet product, a side gather, a support layer or a top sheet. Effect of the Invention

[0020] The nonwoven fabric according to an embodiment of the present invention not only has excellent bulkiness, but also has differentiated visual appearance, thereby providing a high-end image. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, a nonwoven fabric according to an embodiment of the present invention will be described in detail.

[0022] The nonwoven fabric according to an embodiment of the present invention has a sieve function value of 2.0 to 65.9% as represented by the following Equation 1: [Formula 1] Sieve function value (%) = (final weight of powder remaining on the nonwoven fabric after sieving test) / (initial weight of powder used in sieving test) x 100

[0023] If the sieve function value is 2.0 to 65.9%, a nonwoven fabric having improved bulkiness and visibility can be obtained.

[0024] For example, the nonwoven fabric has a sieve function value of 2.0 to 15.7%. If the sieve function value is 2.0 to 15.7%, a nonwoven fabric having improved bulkiness and visibility as well as absorbency and processability can be obtained.

[0025] The nonwoven fabric also has an average hole size of 0.411 to 0.833 mm.

[0026] The nonwoven fabric also has an absorbency of 2.0 to 11.4 sec.

[0027] The nonwoven fabric also has a handle-ometer value in the MD direction of 3.1 to 5.1 g and a handle-ometer value in the CD direction of 1.0 to 2.3 g.

[0028] The nonwoven fabric also has a compressive strength of 3.4 to 6.4 cN (centine wton).

[0029] The nonwoven fabric also contains crimped composite fibers (hereinafter simply referred to as "composite fibers").

[0030] The composite fiber also includes a first propylene-based polymer and a second propylene-based polymer.

[0031] The melting point of the second propylene polymer, as measured by a differential scanning calorimeter (DSC), is higher than the melting point of the first propylene polymer by 30° C. or more.

[0032] The ratio of the melt flow rate (MFR: measurement temperature 230°C, load 2.16 kg) between the first propylene polymer and the second propylene polymer measured according to ASTM D1238 (the second propylene polymer / the first propylene polymer) is 1.5 or more.

[0033] For example, the melting point of the first propylene polymer is higher than the melting point of the second propylene polymer by about 30° C. to 60° C., or by about 30° C. to 100° C.

[0034] For example, the melt index ratio (the second propylene polymer / the first propylene polymer) is 1.7 to 2.0, 1.7 to 3.0, or 1.7 to 4.0.

[0035] The first propylene-based polymer and the second propylene-based polymer are uniformly mixed in the cross section of the composite fiber or are arranged so as to substantially occupy respective regions and are continuously extended along the longitudinal direction, and at least one of the first propylene-based polymer and the second propylene-based polymer can be continuously formed along the longitudinal direction of the composite fiber and at least a portion of the peripheral surface.

[0036] The first propylene-based polymer and the second propylene-based polymer are each independently a propylene homopolymer or a copolymer having propylene as a main structural unit component and one or more α-olefins having 2 to 20 carbon atoms, preferably 2 to 8 carbon atoms, such as ethylene, 1-butene, 1-pentene, 1-hexene, 1-octene, and 4-methyl-1-pentene. For example, the first propylene-based polymer and the second propylene-based polymer are each independently a propylene homopolymer or a propylene-ethylene random copolymer having an ethylene unit component content of 0 to 10 mol% and an MFR of 20 to 200 g / 10 min.

[0037] In particular, in that a nonwoven fabric containing a composite fiber having excellent bulkiness and good flexibility can be obtained, the first propylene-based polymer is a propylene homopolymer, the second propylene-based polymer is a random copolymer of propylene and a small amount of ethylene, and the content of the ethylene unit component is 10 mol % or less, for example, 1 to 10 mol %, and the content of the ethylene unit component is determined by a standard method using 13C-NMR spectroscopy.

[0038] The first propylene-based polymer further contains 1 to 5 wt % of a nucleating agent in addition to the propylene-based polymer component which is the main component, and therefore the crystallization temperature of the first propylene-based polymer is 19°C or more higher than the crystallization temperature of the second propylene-based polymer.

[0039] The first propylene polymer has a melting point in the range of 120 to 175° C., and the second propylene polymer has a melting point in the range of 110 to 155° C. As described above, the melting point difference between the two components is 30° C. or more, 30 to 60° C., or 30 to 100° C.

[0040] The nonwoven fabric also contains 70 to 90 parts by weight of fibers formed by spinning the first propylene-based polymer, and 10 to 30 parts by weight of fibers formed by spinning the second propylene-based polymer.

[0041] The nonwoven fabric has a hydrophilic agent pick-up (OPU) of 0.7% or less, so that the nonwoven fabric can have a rewet index of 5.0 or less and a durable water absorbency of 10 seconds or less.

[0042] The hydrophilic agent may include a wax emulsion, a reactive softener, a silicon-based compound, a surfactant, or a combination thereof. The silicon-based compound may include an amino group-containing silicon, an oxyalkylene group-containing silicon, or a combination thereof. The surfactant may include an anionic surfactant such as a carboxylate-based anionic surfactant, a sulfonate-based anionic surfactant, a sulfate ester-based anionic surfactant, or a phosphate ester-based anionic surfactant (particularly, an alkyl phosphate ester salt); a polyhydric alcohol mono fatty acid ester such as sorbitan fatty acid ester, diethylene glycol monostearate, diethylene glycol monooleate, glyceryl monostearate, glyceryl monooleate, or propylene glycol monostearate; N-(3-oleyloxy-2-hydroxypropyl)diethanolamine, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbit beeswax, polyoxyethylene sorbitan Nonionic surfactants such as sesquistearate, polyoxyethylene monooleate, polyoxyethylene sorbitan sesquistearate, polyoxyethylene glyceryl monooleate, polyoxyethylene monostearate, polyoxyethylene monolaurate, polyoxyethylene monooleate, polyoxyethylene cetyl ether, polyoxyethylene lauryl ether; cationic surfactants such as quaternary ammonium salts, amine salts or amines; amphoteric surfactants such as aliphatic derivatives of secondary or tertiary amines, including carboxy, sulfonate, sulfate, or aliphatic derivatives of heterocyclic secondary or tertiary amines; or combinations thereof.

[0043] In particular, the hydrophilic agent is also a non-ionic hydrophilic agent.

[0044] The nonionic hydrophilic agent may include silicon-based compounds such as amino group-containing silicon and oxyalkylene group-containing silicon; nonionic surfactants such as polyhydric alcohol mono fatty acid esters such as sorbitan fatty acid esters, diethylene glycol monostearate, diethylene glycol monooleate, glyceryl monostearate, glyceryl monooleate, and propylene glycol monostearate, N-(3-oleyloxy-2-hydroxypropyl)diethanolamine, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitan beeswax, polyoxyethylene sorbitan sesquistearate, polyoxyethylene monooleate, polyoxyethylene sorbitan sesquistearate, polyoxyethylene glyceryl monooleate, polyoxyethylene monostearate, polyoxyethylene monolaurate, polyoxyethylene monooleate, polyoxyethylene cetyl ether, and polyoxyethylene lauryl ether; or combinations thereof.

[0045] More specifically, the non-ionic hydrophilic agent also includes surfactants having a solids content of 90% by weight or more (ie, non-ionic surfactants).

[0046] The average diameter of the composite fibers is also from 1 to 50 μm.

[0047] The first propylene-based polymer and the second propylene-based polymer can be produced using a highly stereoregular polymerization catalyst.

[0048] The highly stereoregular polymerization catalyst may include a diester component catalyst, a succinate component catalyst, a metallocene catalyst, or a combination thereof.

[0049] Furthermore, when the first propylene-based polymer further contains the nucleating agent in addition to the propylene-based polymer component that is the main component, the crystallization temperature of the first propylene-based polymer is increased and differentiated from the crystallization temperature of the second propylene-based polymer, thereby improving the thickness of the nonwoven fabric due to the development of crimp, and further improving the softness and bulkiness of the nonwoven fabric.

[0050] The nucleating agent may include a particulate additive, a self-assembled nucleating agent, a reactive nucleating agent, or a combination thereof. The particulate additive may include sodium benzoate, titanium dioxide, silica, nanoclay, sodium salt, calcium titanate, metal oxide, metal hydroxide, or a combination thereof. The self-assembled nucleating agent may include bis(p-methylbenzylidene)sorbitol, dibenzylidene sorbitol, monobenzylidene sorbitol (MBS), bis(p-methylbenzylidene)sorbitol, derivatives thereof, or a combination thereof. The reactive nucleating agent may include metal salts, 4-biphenyl carboxylic acid, 4-biphenyl methanol, adipic acid, or a combination thereof.

[0051] The nonwoven fabric containing the conjugate fibers can be obtained by a normal conjugate melt spinning method without using any special equipment, but it can also be a spunbonded nonwoven fabric produced by a spunbonding method which has excellent productivity.

[0052] Hereinafter, a method for producing a nonwoven fabric according to an embodiment of the present invention will be described in detail.

[0053] A method for producing a nonwoven fabric according to an embodiment of the present invention also includes the following steps: a step of melting the first propylene-based polymer and the second propylene-based polymer in a single extruder at a temperature of 180° C. to 250° C. in separate sections to form a melt (S10); (S20) discharging the molten material through a spinneret having a single spinning nozzle; and The step of discharging each of the discharged melts through a diffuser (S30).

[0054] The method for producing a nonwoven fabric may further include a step (S40) of imparting mechanical properties to the nonwoven fabric formed in the step (S30) by an embossing process using a heated embossing roll or a heat fusion process by high temperature ventilation.

[0055] For example, the embossing process has a bonding rate (i.e., embossed area rate) of 13% or less, and a non-embossed unit area of ​​0.2 mm 2 More than, for example, 0.2 to 0.7 mm 2 The non-embossing unit area means the maximum area of ​​a rectangle inscribed in the embossing in the smallest unit of non-embossing surrounded by embossing on all four sides. If the embossing process is carried out under the conditions in this range, a nonwoven fabric having a larger bulkiness can be obtained while maintaining the necessary nonwoven fabric strength.

[0056] The bonding rate and non-embossed unit area are also adjusted by varying the embossing pattern.

[0057] As a result of the embossing process, the nonwoven fabric includes an embossed portion and a non-embossed portion, and the embossed portion is of an open embossing type and includes a plurality of unit embossing pattern portions arranged in succession at the same or different intervals.

[0058] In addition, each embossing pattern included in the unit embossing pattern portion has an area of ​​0.2 to 0.7 mm. 2 It is also.

[0059] The method for producing a nonwoven fabric may further include a step (S50) of supplying the nonwoven fabric formed in the step (S40) to a post-processing facility and imparting a deep embossed shape to a surface of the nonwoven fabric by a processing roll.

[0060] In the step (S50), the processing roll of the post-processing equipment is configured to give the nonwoven fabric a thickness of 0.3 mm to 0.7 mm by deep embossing processing of 10 to 50 holes / inch through hole processing. The softness and bulkiness of the finally manufactured nonwoven fabric can be further improved by the post-processing in the step (S50).

[0061] The composite fiber nonwoven fabric further contains a fatty acid amide having 5 to 25 carbon atoms in an amount of 0.01 to 3 wt % based on the total weight of the nonwoven fabric.

[0062] The fatty acid amide may act as a slip agent.

[0063] The fatty acid amides may also include oleamide, erucamide, stearamide, or combinations thereof.

[0064] The composite fiber may contain other components, if necessary, in addition to the first propylene polymer and the second propylene polymer, within a range that does not impair the object of the present invention. The other components may include known heat stabilizers, weather stabilizers, various stabilizers, antistatic agents, antiblocking agents, anticlouding agents, fillers, dyes, pigments, natural oils, synthetic oils, waxes, or combinations thereof.

[0065] The stabilizer may include an anti-aging agent such as 2,6-di-t-butyl-4-methylphenol (BHT); a phenolic antioxidant such as tetrakis[methylene-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate]methane, β-(3,5-di-t-butyl-4-hydroxyphenyl)propionic acid alkyl ester, or 2,2′-oxamidobis[ethyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate; a fatty acid metal salt such as zinc stearate, calcium stearate, or calcium 1,2-hydroxystearate; a polyhydric alcohol fatty acid ester such as glycerin monostearate, glycerin distearate, pentaerythritol monostearate, pentaerythritol distearate, or pentaerythritol tristearate; or a combination thereof.

[0066] The filler may also include silica, diatomaceous earth, alumina, titanium dioxide, magnesium oxide, stilbene powder, stilbene balloon, aluminum hydroxide, magnesium hydroxide, basic magnesium carbonate, dolomite, calcium sulfate, potassium titanate, barium sulfate, calcium sulfite, talc, clay, mica, asbestos, calcium silicate, montmorillonite, bentonite, graphite, aluminum powder, molybdenum sulfide, or combinations thereof.

[0067] The above-mentioned propylene-based polymer and the other components used as required can be mixed using a known method.

[0068] The bicomponent fibers may be mono, core / sheath, side-by-side or sandwich type bicomponent fibers.

[0069] Hereinafter, a nonwoven fabric laminate according to an embodiment of the present invention will be described in detail.

[0070] The nonwoven fabric laminate according to one embodiment of the present invention is a laminate having at least two layers, at least one of which is the above-mentioned nonwoven fabric.

[0071] The nonwoven fabric laminate also contains a spunbond nonwoven fabric among the above-mentioned nonwoven fabrics.

[0072] For example, the nonwoven fabric of the crimped composite fiber is a spunbond nonwoven fabric, and the nonwoven fabric laminate is configured such that the spunbond nonwoven fabric is exposed on only one of the two surface layers.

[0073] The nonwoven fabric laminate may also be formed by laminating four sheets of the spunbond nonwoven fabric, and in this case, the nonwoven fabric laminate has a uniformity (CV%) of 3% or less. 2 After cutting the sample into pieces of the same size to prepare 30 test pieces, the weight deviation of the 30 test pieces is divided by the average weight of the test pieces, and this percentage is used to calculate the weight deviation.

[0074] The nonwoven fabric laminate obtained by laminating four sheets of the spunbonded nonwoven fabric has a thickness of 0.02 mm or more, a crimp number of 10 or more per 10 mm, a bonding rate of 13% or less, and an MD stiffness indicating the softness of the nonwoven fabric laminate of 40 mm or less. In this specification, "MD stiffness" refers to the bending deformation in the machine direction of the nonwoven fabric laminate (i.e., the degree to which the nonwoven fabric laminate is warped).

[0075] Hereinafter, an article according to an embodiment of the present invention will be described in detail.

[0076] An article according to one embodiment of the present invention includes the nonwoven laminate described above.

[0077] The article may also be a diaper, an absorbent product, a single-use hygiene product, a toilet product, a side gather, a support layer or a top sheet.

[0078] When the article is a diaper, the nonwoven fabric laminate has an oil pick-up (OPU) of 0.7% or less, and when applied to the top sheet layer of the diaper, also has a durable water absorption rate of 10 seconds or less.

[0079] The hydrophilic agent pick-up (OPU) can also be calculated by the following Equation 1: [Formula 1] OPU(%)=(W1-W0) / W0×100 In the formula 1, W0 is the weight of the nonwoven fabric laminate not containing a hydrophilic agent, and W1 is the weight of the nonwoven fabric laminate containing a hydrophilic agent. In addition, in the formula 1, W1 is the sum of the weight of the nonwoven fabric laminate not containing a hydrophilic agent and the weight of only the solid component of the hydrophilic agent. EXAMPLES

[0080] The present invention will be described in more detail below with reference to examples. These examples are provided to more specifically explain the present invention, but the scope of the present invention is not limited to these examples.

[0081] Example 1: Production of nonwoven fabric First, 88 parts by weight of the first propylene-based polymer and 12 parts by weight of the second propylene-based polymer were melted at a temperature of 180°C to 250°C in each section using one extruder to form a melt. Then, each melt was discharged through a spinneret having a single spinning nozzle. Then, the discharged melt was discharged through a diffuser. Then, mechanical properties were imparted to the formed nonwoven fabric by embossing using a heated embossing roll. Then, as a post-processing, the formed nonwoven fabric was supplied to a post-processing facility, and a three-dimensional shape was imparted to the surface of the nonwoven fabric by deep embossing using a processing roll. During the above-mentioned post-processing, the processing roll was maintained at 137°C. The processing rolls of the post-processing equipment include a first roll having a large number of pins formed thereon and a second roll having a large number of holes formed at positions corresponding to the pins of the first roll, and are configured to impart a three-dimensional shape to the surface of the nonwoven fabric by deep embossing through hole processing. The first propylene-based polymer is a propylene homopolymer (H7700 (manufactured by LG Chem)), and the second propylene-based polymer is an elastomeric random copolymer in which ethylene is copolymerized with polypropylene (ExxonMobile Vistamaxx 7020 (ethylene unit component content: 15.0 mol%)).

[0082] Example 2: Production of nonwoven fabric A nonwoven fabric was produced in the same manner as in Example 1, except that the processing roll was maintained at 130° C. during the post-processing.

[0083] Example 3: Production of nonwoven fabric A nonwoven fabric was produced in the same manner as in Example 1, except that the processing roll was maintained at 120° C. during the post-processing.

[0084] Example 4: Production of nonwoven fabric A nonwoven fabric was produced in the same manner as in Example 1, except that the processing roll was maintained at 127° C. during the post-processing.

[0085] Comparative Example 1: Production of nonwoven fabric A nonwoven fabric was produced in the same manner as in Example 1, except that the processing roll was maintained at 140° C. during the post-processing.

[0086] Comparative Example 2: Production of nonwoven fabric A nonwoven fabric was produced in the same manner as in Example 1, except that the processing roll was maintained at 100° C. during the post-processing.

[0087] Evaluation example: Evaluation of the physical properties of nonwoven fabric The physical properties of each of the nonwoven fabrics produced in the above-mentioned Examples 1 to 4 and Comparative Examples 1 and 2 were evaluated by the following methods, and the results are shown in Table 1 below.

[0088] (1) Sieve function value: Measured by the following method: 1) Preparation of sample (nonwoven fabric (size: 175mm x 150mm)) 2) Collector bottom weight measurement 3) Place the sample between the sieve collector and the collector bottom and secure it with a rubber ring. 4) Assemble the sieve collector fixed with a rubber ring, the sample, and the collector bottom (instrument name: AS200 Analytical Sieve Shakers (Germany)) into the instrument. 5) 20 g of glass bead powder (Mondi Lembacel Betheniville) is accurately weighed on a balance and then sprinkled on a sieve collector. The particle size distribution of the glass bead powder is as follows: Content of particles with a particle size of 0.045-0.060 mm = 3.1 wt%; Content of particles with a particle size of 0.061-0.075 mm = 10.9 wt%; Content of particles with a particle size of 0.076-0.090 mm = 14.1 wt%; Content of particles with a particle size of 0.091-0.105 mm = 39.9%; Content of particles with a particle size of 0.106-0.120 mm = 28.1%; The content of particles having a particle size of 0.121 to 0.135 mm=3.1% by weight; and Content of particles with a particle size of 0.136 to 0.150 mm = 0.8% by weight 6) Separate the collector bottom and measure its weight (= powder + collector bottom). 7) Calculate the sieve function value according to the following formula 1: (Final weight remaining on nonwoven fabric) / 20g x 100 = {20g-(collector bottom weight after test-collector bottom weight before test)} / 20g×100

[0089] (2) Thickness (mm): Measured by the block cage thickness measurement method (KSK0506 method). The thickness of the nonwoven fabric is an index of bulkiness.

[0090] (3) Average hole size: The average size of the major and minor axes was measured in mm under an optical microscope at a magnification of 25. The average size of the nonwoven holes is an index of visibility.

[0091] (4) Absorbance: Measured by WSP 70.3.

[0092] (5) Handle-O-Meter Value (g): Measured by WSP 90.3. The handle-o-meter value of a nonwoven fabric is an index of softness.

[0093] (6) Compressive strength: Measured according to JIS P 8126. The compressive strength of a nonwoven fabric is yet another index of softness.

[0094] [Table 1]

[0095] Furthermore, the required physical properties of the nonwoven fabric that meets the object of the present invention are shown in Table 2 below.

[0096] [Table 2]

[0097] Referring to Tables 1 and 2 above, it can be seen that the nonwoven fabrics produced in Examples 1 to 4 satisfy all of the required physical properties of a nonwoven fabric conforming to the object of the present invention, whereas the nonwoven fabrics produced in Comparative Examples 1 and 2 do not satisfy at least one of the required physical properties of a nonwoven fabric conforming to the object of the present invention.

[0098] Although the present invention has been described with reference to the embodiments, they are merely illustrative, and those skilled in the art will understand that various modifications and equivalent embodiments are possible therefrom. Therefore, the true technical scope of the present invention is defined by the technical ideas of the claims.

Claims

1. A nonwoven fabric, comprising: A plurality of holes are formed, and the sieve function value represented by the following Equation 1 is 2.0 to 65.9%, the average size of the holes is 0.411 to 0.833 mm; The nonwoven fabric comprises a first propylene-based polymer, and the first propylene-based polymer further comprises a nucleating agent in addition to a propylene-based polymer component as a main component. The nonwoven fabric is manufactured through an embossing process, and the embossing process has a bonding rate of 13% or less. The nonwoven fabric has a non-embossed unit area of ​​0.2 mm 2 or more and a thickness of 0.3 to 0.7 mm. [Formula 1] Sieve function value (%)=(final weight of powder remaining on the nonwoven fabric after sieving test) / (initial weight of powder used in sieving test)×100.

2. 2. The nonwoven fabric according to claim 1, wherein the sieve function value is 2.0 to 15.7%.

3. 2. The nonwoven fabric according to claim 1, having an absorbency of 2.0 to 11.4 sec.

4. 2. The nonwoven fabric according to claim 1, having a Handle-O-Meter value in the MD direction of 3.1 to 5.1 g and a Handle-O-Meter value in the CD direction of 1.0 to 2.3 g.

5. The nonwoven fabric according to claim 1, having a compressive strength of 3.4 to 6.4 cN.

6. A nonwoven fabric laminate having a layer structure of at least two layers, at least one of which is the nonwoven fabric according to any one of claims 1 to 5.

7. The nonwoven fabric laminate according to claim 6 , wherein the nonwoven fabric is a spunbonded nonwoven fabric, and the nonwoven fabric laminate is configured such that the spunbonded nonwoven fabric is exposed on only one of the two surface layers.

8. An article comprising the nonwoven laminate of claim 7.

9. 9. The article of claim 8, wherein the article is a diaper, an absorbent article, a single-use hygiene product, a toilet product, a side gather, a support layer or a topsheet.

Citation Information

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