KR102036763B1 - Non-woven fabric of crimped composite fiber and laminate thereof, and article including the laminate - Google Patents

Abstract

Disclosed are a nonwoven fabric of a crimped composite fiber, a laminate thereof, and an article. The disclosed nonwoven fabric of a crimped composite fiber comprises a first propylene-based polymer component and a second propylene-based polymer component, wherein a melting point of the first propylene-based polymer component measured by a differential scanning calorimetry (DSC) is higher than a melting point of the second propylene-based polymer component by 30°C or more, a ratio (second component/first component) of melting indexes (MFR: measured temperature 230°C, load 2.16 kg), measured according to ASTM D1238, of the first propylene-based polymer component and the second propylene-based polymer component is 1.7 or more, and a component ratio represented by the first propylene-based polymer component/the second propylene-based polymer (weight ratio) is 50/50 to 10/90. According to the present invention, the nonwoven fabric of the crimped composite fiber has a clear crimped shape and excellent stability in shape, thereby improving excellent softness and bulky properties.

Description

Non-woven fabric of crimped composite fiber and laminate etc, and article including the laminate}

Disclosed are nonwoven fabrics of crimped composite fibers, laminates thereof, and articles. More specifically, a nonwoven fabric of crimped composite fibers having improved softness and bulkiness, laminates thereof, and articles are disclosed.

The nonwoven fabric has final properties determined by the web formation method and the bonding method.

In the manufacture of the existing spunbond nonwoven fabric, the web is formed through the single spinning or the eccho composite spinning. The web thus formed has a simple structure free of crimps and is joined by a heating calendar to form a thin nonwoven fabric.

Thin nonwoven fabrics are used for topsheets and backsheets in diaper manufacture, but the bulkiness is significantly lower than the short-fiber air-through nonwoven fabrics that form webs by carding and bond with hot air, resulting in reduced softness. There is this.

In addition, the crimp is not given when forming the web, so the bulkyness is reduced, and the area directly contacting the baby's butt skin during diaper manufacturing is large, and there is no free space between the ADL layer (Aquisition Distribution Layer) when laminating nonwoven fabrics. There is a problem that remains in the topsheet to crush the baby's butt or cause a rash. In addition, there is a problem in that urine leaks out of the diaper.

One embodiment of the present invention provides a nonwoven fabric of crimped composite fiber with improved softness and bulkiness.

Another embodiment of the present invention provides a nonwoven laminate comprising two or more nonwoven fabrics of the crimped composite fiber.

Another embodiment of the invention provides an article comprising the nonwoven laminate.

One aspect of the invention,

A nonwoven fabric of crimped composite fiber comprising a first propylene polymer component and a second propylene polymer component, wherein the first propylene polymer component and the second propylene polymer component are measured by differential scanning calorimetry (DSC). Melt index (MFR) of melting point of the first propylene polymer component is at least 30 ° C. higher than the melting point of the second propylene polymer component and measured according to ASTM D1238 of the first propylene polymer component and the second propylene polymer component : The ratio (second component / first component) of the measurement temperature of 230 ° C. and the load of 2.16 kg) is 1.7 or more, and the component ratio represented by the first propylene polymer component / the second propylene polymer (weight ratio) is 50 /. It provides a crimped composite fiber nonwoven fabric of 50 to 10/90.

The first propylene polymer component and the second propylene polymer component are each independently a propylene homopolymer, a propylene-ethylene copolymer, an elastomeric random copolymer in which ethylene is copolymerized with propylene, and a propylene-ethylene-butylene terpolymer. Polymers or combinations thereof.

The nonwoven fabric may further include a fatty acid amide having 5 to 25 carbon atoms in an amount of 0.01 to 3% by weight based on the total weight of the nonwoven fabric.

The nonwoven fabric may include an embossing portion and a non-embossing portion, and the embossing portion may include a plurality of unit embossing pattern portions sequentially arranged at the same or different intervals in an open embossing type.

The unit embossing pattern portion may have the following shape:

.

.

Each embossing pattern included in the unit embossing pattern part may have an area of 0.2 to 0.7 mm ² .

The nonwoven fabric may have a bonding ratio of 13% or less.

The crimped composite fiber may be a monofiber, a sheath type, a side by side type or a sandwich type composite fiber.

The nonwoven fabric may be a spunbond nonwoven fabric.

Another aspect of the invention,

A nonwoven fabric laminate having at least two or more layers, wherein at least one layer thereof is a nonwoven fabric of the crimped composite fiber.

The nonwoven fabric is a spunbond nonwoven fabric, and the nonwoven fabric laminate is formed by stacking four spunbond nonwoven fabrics, and may have a uniformity (CV%) of 3% or less.

The nonwoven laminate may have a thickness of 0.02 mm or more, a number of crimps of 10/10 mm or more, a bonding ratio of 13% or less, and an MD stiffness of the bonding region of each embossing pattern may be 50 mm or less.

Another aspect of the invention,

An article comprising the nonwoven laminate is provided.

The article may be a diaper, absorbent article, bowel article, support layer or topsheet.

When the article is a diaper, the nonwoven fabric laminate may have a hydrophilic impregnation amount (OPU) of 0.7% or less, so that the absorption rate of water may be 3 sec or less when applied to the topsheet layer of the diaper.

Nonwoven fabric of crimped composite fiber according to an embodiment of the present invention can be improved in the softness and bulkiness of the crimp is clear and good shape safety.

Therefore, the diaper including the nonwoven fabric of the crimped composite fiber may not hurt or cause rash on the wearer's skin.

1 is a partial view showing the embossing pattern of the nonwoven fabric of crimped composite fiber according to an embodiment of the present invention.
2 is a cross-sectional view of the crimped composite fiber used in Examples and Comparative Examples.
3 is a partial view showing an embossing pattern of the nonwoven fabric of the crimped composite fiber prepared in Example 1. FIG.

Hereinafter, the nonwoven fabric of the crimped composite fiber according to one embodiment of the present invention will be described in detail.

The nonwoven fabric of crimped composite fiber (hereinafter referred to simply as "composite fiber") according to one embodiment of the present invention includes a first propylene polymer component and a second propylene polymer component.

The first propylene-based polymer component and the second propylene-based polymer component have a melting point of (i) the first propylene-based polymer component measured by a differential scanning calorimeter (DSC) at 30 ° C. above the melting point of the second propylene-based polymer component. (Ii) the ratio of the melt index (MFR: measurement temperature 230 ° C., load 2.16 kg) measured according to ASTM D1238 of the first propylene polymer component and the second propylene polymer component (second component / agent 1 component) is 1.7 or more, and (iii) The component ratio represented by the said 1st propylene polymer component / the said 2nd propylene polymer (weight ratio) is 50/50-10/90.

For example, the melting point of the first propylene-based polymer component may be 30 ° C. to 60 ° C. or 30 ° C. to 100 ° C. higher than the melting point of the second propylene-based polymer component.

For example, the ratio of the melt index (second component / first component) may be 1.7 to 2.0, 1.7 to 3.0, or 1.7 to 4.0.

When the first propylene polymer component and the second propylene polymer component satisfy both of the above conditions (i) to (iii), the composite fiber has crimpability, and the nonwoven fabric composed of the composite fiber has excellent softness and May have bulkyness.

The first propylene-based polymer component and the second propylene-based polymer component are arranged to occupy substantially each region in the cross section of the composite fiber, extend continuously along the longitudinal direction, and the first propylene-based polymer component And at least one of the second propylene-based polymer components may form at least a portion of the peripheral surface continuously along the longitudinal direction of the composite fiber.

The first propylene polymer component and the second propylene polymer component may each independently be a propylene homopolymer, a propylene-ethylene random copolymer, an elastomeric random copolymer in which ethylene is copolymerized with polypropylene, and propylene-ethylene-butylene Terpolymers or combinations thereof.

The propylene-ethylene random copolymer may have a content of ethylene unit components of 10 to 30 mole percent and an MFR of 10 to 200 g / 10 minutes. In addition, the content of the ethylene unit component is determined by ¹³ C-NMR spectral measurement.

As one example, the elastomeric random copolymer may be included in the ratio of 10 to 30% by weight in the first propylene-based polymer component.

As another example, the propylene-ethylene-butylene terpolymer may be included in the ratio of 10 to 30% by weight in the first propylene-based polymer component.

As another example, the elastomeric random copolymer and the propylene-ethylene-butylene terpolymer may be included in the ratio of 10 to 30% by weight in the first propylene-based polymer component.

More specifically, at least one of the first propylene-based polymer component and the second propylene-based polymer component may be a homopolymer of propylene; Propylene is used as the main structural unit component, and 2 to 20 carbon atoms such as ethylene, 1-butene, 1-pentene, 1-hexene, 1-octene, and 4-methyl-1-pentene, for example, 2 to 8 Copolymers with one or two or more of α-olefins; Or combinations thereof.

In particular, the first propylene polymer component is 70-90 wt% of the propylene homopolymer and the elastomeric random copolymer or the propylene-ethylene- in that a nonwoven fabric of a composite fiber having excellent softness and bulkiness can be obtained. 10-30% by weight of a butylene terpolymer, the second propylene-based polymer component may be a propylene homopolymer.

The melting point of the first propylene-based polymer component may range from 120 to 175 ° C, and the melting point of the second propylene-based polymer component may range from 110 to 155 ° C. In addition, the melting point difference of the two components may be in the range of 30 ℃ or more, 30 ℃ to 60 ℃ or 30 ℃ to 100 ℃ as described above.

Such a propylene polymer can be prepared using a high stereoregular polymerization catalyst.

The high stereoregular polymerization catalyst may include a catalyst of a diester component, a catalyst of a succinate component, a metallocene catalyst, or a combination thereof.

The nonwoven fabric containing the composite fiber can be obtained by a conventional composite melt spinning method without using a special apparatus, for example, it can be a spunbond nonwoven fabric produced by a spunbonding method having excellent productivity.

Hereinafter, the manufacturing method of a spunbond nonwoven fabric is explained in full detail.

First, the first propylene-based polymer component forming one region of the composite fiber and the second propylene-based polymer component forming the other region are separately melted with an extruder or the like to form and discharge a desired fiber structure. Each melt is discharged from a spinneret having a composite spinning nozzle to release a composite long fiber.

Thereafter, the discharged long fibers are cooled by cooling air, and are further tensioned by stretching air to give a predetermined fineness, and are collected on a collection belt as it is and deposited to a predetermined thickness.

Thereafter, post-processing is performed by a method using a needle punch, water jet, ultrasonic wave, or the like as an entanglement treatment, or a method of heat fusion by embossing using a heating embossing roll or by hot aeration.

In one embodiment of the present invention, the nonwoven fabric may be formed by heat fusion by the embossing process.

The embossing may be performed at a bonding rate (ie, embossed area ratio) of 13% or less and a non-embossed unit area of 0.2 mm ² or more, for example, 0.2 to 0.7 mm ² . Here, a non-embossing unit area means the largest area of the rectangle which inscribes in embossing in the non-embossing part of the smallest unit in which the four sides are surrounded by the embossing part. If embossing is performed under the conditions within this range, a bulky nonwoven fabric can be obtained while maintaining the required nonwoven fabric strength.

The bonding rate and non-embossing unit area can be adjusted by changing the embossing pattern.

As a result of the embossing, the nonwoven fabric may include an embossing portion and a non-embossing portion, and the embossing portion may include a plurality of unit embossing pattern portions sequentially arranged at the same or different intervals in an open embossing type.

The unit embossing pattern portion may have the following shape:

The fineness and the basis weight of the nonwoven fabric may be appropriately selected depending on the application, and in general, the fineness is 1.0 to 2.5 denier, for example, 0.7 to 2.0 denier, and the basis weight is 15 to 100 g / m ² , for example 7 to 30 g / m ² .

In addition, each embossing pattern included in the unit embossing pattern may have an area of 0.2 to 0.7 mm ² .

The nonwoven fabric of the composite fiber may further include a fatty acid amide having 5 to 25 carbon atoms in an amount of 0.01 to 3% by weight based on the total weight of the nonwoven fabric.

The fatty acid amide can serve as a slip agent.

The fatty acid amide may comprise oleic acid amide, erucaramide, stearic acid amide or a combination thereof.

The composite fiber may contain other components, if necessary, in addition to the first propylene polymer component and the second propylene polymer component, as necessary without departing from the object of the present invention. The other components may include known heat stabilizers, weather stabilizers, various stabilizers, antistatic agents, antiblocking agents, antifoaming agents, fillers, dyes, pigments, natural oils, synthetic oils, waxes or combinations thereof.

The stabilizer may be an antioxidant such as 2,6-di-t-butyl-4-methylphenol (BHT); Tetrakis [methylene-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate] methane, β- (3,5-di-t-butyl-4-hydroxyphenyl) propionic acid Phenolic antioxidants such as alkyl esters and 2,2'-oxamidobis [ethyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate; Fatty acid metal salts such as zinc stearate, calcium stearate and calcium 1,2-hydroxystearate; Polyhydric alcohol fatty acid esters such as glycerin monostearate, glycerin distearate, pentaerythritol monostearate, pentaerythritol distearate, pentaerythritol tristearate; Or combinations thereof.

The fillers include silica, diatomaceous earth, alumina, titanium oxide, magnesium oxide, pumice powder, pumice balun, 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.

The above-mentioned propylene polymer and the other components used as necessary can be mixed using a known method.

The composite fiber may be mono, core / sheath, side-by-side, or sandwich type of composite fiber.

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

The nonwoven fabric laminate according to one embodiment of the present invention is a laminate having a layer structure of at least two or more layers, at least one of which may be the nonwoven fabric described above.

The nonwoven fabric laminate may include a spunbond nonwoven fabric of the nonwoven fabric described above.

In addition, the nonwoven fabric laminate may be formed by laminating four spunbond nonwoven fabrics, in which case the nonwoven fabric laminate may have a uniformity (CV%) of 3% or less. In the present specification, "uniformity (CV%)" refers to a nonwoven fabric laminate cut to a size of 1 m ² to make 30 test pieces, and then, a percentage of the value obtained by dividing the weight deviation of the 30 test pieces by the average weight of the plurality of test pieces. it means.

The nonwoven fabric laminate, in which the four spunbond nonwoven fabrics are laminated, has a thickness of 0.02 mm or more, a number of crimps of 10/10 mm or more, a bonding ratio of 13% or less, and an MD stiffness showing softness of the nonwoven fabric laminate. (MD stiffness) may be 40 mm or less. As used herein, "MD stiffness" means the machine direction bending deformation of the nonwoven laminate (ie, the degree to which the nonwoven laminate is bent).

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

An article according to one embodiment of the invention comprises the nonwoven laminate described above.

The article may be a diaper, an absorbent article, a defecation article, a support layer or a top sheet.

When the article is a diaper, the nonwoven fabric laminate may have a hydrophilic agent impregnated amount (OPU: Oil Pick-Up) of 0.7% or less, so that the absorption rate of water may be 3 sec or less when applied to the topsheet layer of the diaper.

The hydrophilic impregnation amount (OPU) can be calculated according to the following equation (1).

[Equation 1]

OPU (%) = (W1-W0) / W0 X 100

In the formula, W0 is the weight of the nonwoven fabric laminate containing no hydrophilic agent, and W1 is the weight of the nonwoven fabric laminate containing hydrophilic agent. In addition, the hydrophilic agent is a water suspension of polydimethylsiloxane having a concentration of 15% by weight.

Hereinafter, the present invention will be described in more detail with reference to Examples. This embodiment is intended to illustrate the present invention in more detail, and the scope of the present invention is not limited to these examples.

Examples 1-6 and Comparative Examples 1-5

Side-by-side type which has a composition of FIG. 2 by carrying out composite melt spinning by spunbonding using the first propylene polymer component (A), the second propylene polymer component (B), and the erucamide slip agent. Composite fibers were deposited on the collecting surface and embossed using a calender roll heated at an upper temperature of 146 ° C. and a lower temperature of 144 ° C. by the embossing pattern shown in FIG. 1 to produce a nonwoven fabric comprising crimped composite fibers. It was. The kind, physical properties and content ratio of the first propylene polymer component and the second propylene polymer component (B), the content of the erucamide slip agent, and the characteristics of the embossing pattern are shown in Table 1 below. In Table 1 below, MFR means a melt index measured under the conditions of temperature 230 ℃, 2.16kg load according to ASTM D1238, the slip agent content means the weight relative to the total weight of the nonwoven fabric.

EXAMPLE Comparative example One 2 3 4 5 6 One 2 3 4 5 First component polymer PA1 PA2 PA3 PA4 PA5 PA1 PA1 PA6 PA7 PA1 PA1 Melting Point (℃) 130 120 100 130 130 130 130 140 130 130 130 MFR (g / 10 min) 35 35 35 30 20 35 35 35 35 35 35 Second component polymer PB PB PB PB PB PB PB PB PB PB PB Melting Point (℃) 160 160 160 160 160 160 160 160 160 160 160 MFR (g / 10 min) 60 60 60 60 60 60 60 60 35 60 60 Of the first and second components
Melting point difference (℃) 30 40 60 30 30 30 30 20 30 30 30 MFR ratio of 1st, 2nd component 1.7 1.7 1.7 2.0 3.0 1.7 1.7 1.7 1.0 1.7 1.7 First / second component ratio (weight ratio) 50 /
50 50 /
50 50 /
50 50 /
50 50 /
50 10 /
90 90 /
10 50 /
50 50 /
50 5/95 60 /
40 Slipper content (% by weight) One One One One One One One One One One One Embossing
pattern Bonding rate
(%) 12 12 12 12 12 12 12 12 12 12 12 Non-embossing
Unit area
(mm ² ) 22.944 22.944 22.944 22.944 22.944 22.944 22.944 22.944 22.944 22.944 22.944

In Table 1, PA1 to PA7 and PB mean the following.

(1) PA1: A mixture of 70% by weight of propylene homopolymer (LG Chem, H7700) and 30% by weight of elastomeric random copolymer (LG Chem, T-7700) copolymerized with ethylene in polypropylene

(2) PA2: A mixture of 60% by weight of propylene homopolymer (LG Chem, H7700) and 40% by weight of elastomeric random copolymer (EXXON, VISTAMAXX 7020) copolymerized with ethylene in polypropylene

(3) PA3: a mixture of 40% by weight of propylene homopolymer (LG Chem, H7700) and 60% by weight of elastomeric random copolymer (DOW, VERSIFY 4200) copolymerized with ethylene in polypropylene

(4) PA4: a mixture of 70 wt% propylene homopolymer (LG Chem, H7700) and 30 wt% wt% of an elastomeric random copolymer (LG Chem, T-7700) copolymerized with ethylene in polypropylene

(5) PA5: a mixture of 70% by weight of propylene homopolymer (LG Chem, MH7700) and 30% by weight of elastomeric random copolymer (LG Chem, T-7700) copolymerized with ethylene in polypropylene

(6) PA6: a mixture of 60 wt% propylene homopolymer (LG Chem, MH7700) and 40 wt% wt% of an elastomeric random copolymer (LG Chem, T-7700) copolymerized with ethylene in polypropylene

(7) PA7: a mixture of 70% by weight of propylene homopolymer (LG Chem, H7700) and 30% by weight of elastomeric random copolymer (LG Chem, T-7700) copolymerized with ethylene in polypropylene

(8) PB: Propylene Homopolymer (PMC, H562T)

Evaluation Example 1 Evaluation of Physical Properties of Spunbond Nonwoven Fabric

The physical properties of each of the spunbonded nonwoven fabrics prepared in Examples 1 to 6 and Comparative Examples 1 to 5 were evaluated in the following manner, and the results are shown in Table 2 below.

(1) Weight per unit area (weight: g / m ² ): Measured according to ASTM D 3776-1985.

(2) Tensile strength: Tensile strength was obtained by using a tensile strength tester (Instron) measuring equipment under the conditions of width 5cm, interval 10cm, tensile speed 500mm / min of the test piece according to the KSK 0520 method.

(3) Tensile elongation: The elongation at the time of maximum elongation measured by the method of said (2) was calculated | required.

(4) Thickness (mm): It measured according to the method of KSK 0506.

(5) Number of crimps: The number of filament crimps in the 10 mm range was directly measured using a microscope.

(6) Radioactivity: Filament shake was visually observed during melt spinning, and polymer drips were detected by a defect detector.

EXAMPLE Comparative example One 2 3 4 5 6 One 2 3 4 5 Tensile Strength (MD)
(kgf / 5cm) 4.71 5.19 4.92 5.54 4.32 5.28 4.56 3.89 3.74 3.56 4.12 Tensile Strength (CD) (kgf / 5cm) 2.57 2.94 2.78 3.45 2.00 3.15 2.28 1.54 1.45 1.23 1.89 Tensile Elongation (MD) (%) 117 118 127 127 131 125 110 118 112 124 110 Tensile Elongation (CD) (%) 125 125 133 130 145 132 124 130 124 134 119 Thickness (mm) 0.484 0.494 0.549 0.575 0.621 0.529 0.328 0.457 0.243 0.470 0.287 Crimp Number (piece / 10mm) 11 12 15 19 24 15 3 6 0 7 9 Radioactive Good Good Good Good Good Good Good Good Good Good Good

Referring to Table 2, the nonwoven fabric of the crimped composite fiber prepared in Examples 1 to 6 is thicker than the nonwoven fabric of the crimped composite fiber prepared in Comparative Examples 1 to 5, has a large number of crimps, and has a tensile strength (MD: Other physical properties such as machine direction, tensile strength (CD) cross direction, MD (machine direction), tensile elongation (CD) cross direction and radioactivity have been shown to be good or similar.

3 is a partial view showing an embossing pattern of the nonwoven fabric of the crimped composite fiber prepared in Example 1. FIG.

Referring to FIG. 3, the nonwoven fabric of the crimped composite fiber prepared in Example 1 was found to have a crimp number of about 20/10 mm.

Evaluation Example 2 Evaluation of Physical Properties of a Nonwoven Fabric Laminate Comprising a Spunbond Nonwoven Fabric

Each of the spunbonded nonwoven fabrics prepared in Examples 1 to 6 and Comparative Examples 1 to 5 was laminated to prepare a nonwoven fabric laminate. Thereafter, the physical properties of each of the nonwoven fabric laminates were evaluated in the following manner, and the results are shown in Table 3 below.

(1) Uniformity (CV%): The nonwoven fabric laminate was cut to a size of 1 m ² to make 30 test pieces, and the weight deviation of the 30 test pieces was calculated as a percentage of the value obtained by dividing by the average weight of the plurality of test pieces. . The smaller the uniformity (CV%) value, the better the uniformity.

(2) Thickness (mm): It measured according to the method of KSK 0506.

(3) Number of crimps: The number of filament crimps in the 10 mm range was directly measured using a microscope.

(4) Bonding rate (%): As the embossed portion of the embossing pattern, it means the percentage of the portion where the heat is transferred and the nonwoven fabric is bonded.

(5) MD stiffness (mm): The bending distance when the nonwoven fabric laminate sample was in contact with the inclined plane when measuring the tester with a 45 degree inclination was measured. The smaller the MD stiffness, the better the flexibility.

(6) OPU: Abbreviation for Oil Pick Up, the amount of the hydrophilic agent applied to the nonwoven fabric laminate was calculated by calculating the percentage of the total weight.

(7) Water absorption rate: When artificial urination was dropped on the nonwoven fabric laminate according to EDANA 150.5 (02), the time for the artificial urination to pass through the nonwoven fabric laminate was measured by a sensor.

EXAMPLE Comparative example One 2 3 4 5 6 One 2 3 4 5 Uniformity (CV%) 2.72 2.84 2.65 2.74 2.78 2.78 2.45 2.87 2.65 2.34 2.57 Thickness (mm) 0.484 0.494 0.549 0.575 0.621 0.529 0.328 0.457 0.243 0.414 0.287 Crimp Number (piece / 10mm) 11 9 15 19 24 15 3 6 0 7 2 Bonding rate (%) 12 12 12 12 12 12 12 12 12 12 12 MD Lecture (mm) 49 48 44 45 42 47 51 52 58 50 52 OPU (%) 0.67 0.65 0.68 0.64 0.67 0.68 0.68 0.67 0.66 0.67 0.66 Water absorption rate (sec) 2.9 2.7 2.5 2.2 1.8 2.5 3.0 3.0 3.2 3.1 3.1

Referring to Table 3, the nonwoven fabric laminate produced by laminating four nonwoven fabrics of each crimped composite fiber prepared in Examples 1 to 6 is a nonwoven fabric of each crimped composite fiber prepared in Comparative Examples 1 to 5. The uniformity of the nonwoven fabric laminates produced by laminating four by three is better than or equal to 3%. Appeared.

Although the present invention has been described with reference to the drawings and embodiments, it is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

1: crimped composite fiber 10: nonwoven fabric of crimped composite fiber
11: embossing part 12: non-embossing part
A: first propylene-based polymer component B: second propylene-based polymer component

Claims (15)

A nonwoven fabric of crimped composite fiber comprising a first propylene polymer component and a second propylene polymer component,
The first propylene polymer component and the second propylene polymer component have a melting point of the first propylene polymer component measured by a differential scanning calorimeter (DSC) at least 30 ° C. above the melting point of the second propylene polymer component, The ratio (second component / first component) of the melt index (MFR: measurement temperature 230 ° C., load 2.16 kg) measured according to ASTM D1238 of the first propylene polymer component and the second propylene polymer component is 1.7 or more And a component ratio represented by said first propylene polymer component / second propylene polymer (weight ratio) is 50/50 to 10/90. The method of claim 1,
The first propylene-based polymer component and the second propylene-based polymer component are each independently a propylene homopolymer, a propylene-ethylene copolymer, an elastomeric random copolymer in which ethylene is copolymerized with polypropylene, and a propylene-ethylene-butylene terpolymer Crimped composite fiber nonwoven comprising a polymer or a combination thereof. The method of claim 1,
The nonwoven fabric is crimped composite fiber nonwoven fabric further comprises a fatty acid amide of 5 to 25 carbon atoms in an amount of 0.01 to 3% by weight relative to the total weight of the nonwoven fabric. The method of claim 1,
The nonwoven fabric includes an embossed portion and a non-embossed portion, wherein the embossed portion is a crimped composite fiber nonwoven fabric comprising a plurality of unit embossed pattern portions continuously arranged at the same or different intervals in an open embossed type. The method of claim 4, wherein
The unit embossing pattern portion crimped composite fiber nonwoven fabric having the following shape:

. The method of claim 4, wherein
Each embossing pattern included in the unit embossing pattern portion has an area of 0.2 to 0.7 mm ² crimped composite fiber nonwoven fabric. The method of claim 4, wherein
The nonwoven fabric is crimped composite fiber nonwoven fabric having a bonding ratio of 13% or less. The method of claim 1,
The crimped composite fiber is a crimped composite fiber nonwoven fabric that is a mono-, sheath-type, side-by-side or sandwich-type composite fiber. The method of claim 1,
The nonwoven fabric is a crimped composite fiber nonwoven fabric that is a spunbond nonwoven fabric. A nonwoven fabric laminate having at least two or more layers, wherein at least one layer is a crimped composite fiber nonwoven fabric according to any one of claims 1 to 9. The method of claim 10,
The nonwoven fabric is a spunbond nonwoven fabric, and the spunbond nonwoven fabric is formed by stacking four nonwoven fabrics having a uniformity (CV%) of 3% or less. The method of claim 11,
The nonwoven fabric laminate has a thickness of 0.02 mm or more, a number of crimps of 10/10 mm or more, a bonding ratio of 13% or less, and a MD stiffness of the bonding area of each embossing pattern of 50 mm or less. An article comprising the nonwoven laminate of claim 10. The method of claim 13,
The article is a diaper, absorbent article, bowel article, support layer or top sheet. The method of claim 14,
Wherein when the article is a diaper, the nonwoven laminate has a hydrophilic impregnation amount (OPU) of 0.7% or less such that the rate of water absorption when applied to the topsheet layer of the diaper is 3 sec or less.

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