KR102320794B1 - Non-woven fabric and laminate thereof, article including the laminate, and method of preparing the non-woven fabric - Google Patents

Abstract

Nonwovens, nonwoven laminates, articles, and methods of making nonwovens are disclosed. The disclosed nonwoven fabric is a nonwoven fabric including crimped composite fibers, wherein the crimped composite fibers have a cross section in the thickness direction including side A and side B, and the melt index (MFR) of the side A and side B measured according to ASTM D1238. : Measuring temperature 230°C, load 2.16 kg) ratio (the side B/the side A) is 0.65 to 1.51, and the component ratio expressed by the side A/the side B (weight ratio) is 50/50 to 70/30, , ratio (the side B/the side A) of molecular weight distribution of the said side A and the said side B is 0.5-1.5.

Description

Non-woven fabric, non-woven laminate, article, and manufacturing method of non-woven fabric TECHNICAL FIELD

Nonwovens, nonwoven laminates, articles, and methods of making nonwovens are disclosed. More specifically, a nonwoven fabric, a nonwoven fabric laminate, an article, and a method for manufacturing a nonwoven fabric with improved softness and bulkiness are disclosed.

The final physical properties of the nonwoven fabric are determined according to the web forming method and bonding method.

In the manufacture of the existing spunbond nonwoven fabric, the web is formed through single spinning or core-sheath composite spinning. The web thus formed has a simple structure without crimps, and is combined by a heating calender to form a thin nonwoven fabric.

Thin nonwoven fabrics are used for top and back sheets in the manufacture of diapers, but compared to short-fiber air-through nonwoven fabrics that form a web by carding and bind with hot air, the bulkiness is significantly lower, so the softness is lowered. There is this.

In addition, since crimping is not given during web formation, the bulkiness is low, so the area that directly touches the baby's buttocks skin is large when manufacturing diapers, and there is no free space between the ADL layer (Aquisition Distribution Layer) when laminating the nonwoven fabric, so some urine during urination There is a problem that remains on the top seat and rubs the baby's buttocks or causes a rash. In addition, there is also a problem that urine leaks to the outside of the diaper.

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

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

Another embodiment of the present invention provides an article including the nonwoven laminate.

Another embodiment of the present invention provides a method for manufacturing the nonwoven fabric.

One aspect of the present invention is

As a nonwoven fabric comprising a crimped type composite fiber,

The crimped composite fiber has a cross section in the thickness direction including side A and side B,

The ratio (the side B/the side A) of the side A and the side B melt index (MFR: measured temperature 230° C., load 2.16 kg) measured according to ASTM D1238 is 0.65 to 1.51,

The component ratio expressed as the side A/the side B (weight ratio) is 50/50 to 70/30,

A nonwoven fabric having a ratio of the molecular weight distribution of the side A and the side B (the side B/the side A) of 0.5 to 1.5 is provided.

The side A includes a first propylene-based polymer, the side B includes a second propylene-based polymer, and the first propylene-based polymer and the second propylene-based polymer may have different melt index and molecular weight distribution. have.

The side B further includes a third propylene-based polymer, the second propylene-based polymer and the third propylene-based polymer have different melt index and molecular weight distribution, respectively, and the third propylene-based polymer/the second propylene-based polymer The component ratio expressed by the polymer (weight ratio) may be greater than 0/100 to 50/50 or less.

The nonwoven fabric may have a thickness of 0.25 mm or more, and the number of crimps may be 20/10 mm or more.

The nonwoven fabric may have a coefficient of friction (COF) of 0.60 or less.

The crimped type composite fiber may be a side-by-side type or a sandwich type composite fiber.

The nonwoven fabric may be a spunbond nonwoven fabric.

Another aspect of the present invention is

A nonwoven fabric laminate having at least two or more layers, wherein at least one layer is the nonwoven fabric, is provided.

The nonwoven fabric may be a spunbond nonwoven fabric, and the nonwoven fabric laminate may be configured such that the spunbond nonwoven fabric is exposed only on one side of both surface layers.

Another aspect of the present invention is

It provides an article comprising the nonwoven laminate.

The article may be a diaper, an absorbent article, a toilet article, a support layer, a back sheet, a waistband or a top sheet.

Another aspect of the present invention is

forming a side A-forming polymer and a side B-forming polymer by melting the side A-forming polymer and side B-forming polymer at a temperature of 180° C. to 250° C. for each section with separate extruders to form a side A-forming melt and a side B-forming melt (S10);

discharging each of the melts through a spinneret having a compound spinning nozzle (S20);

stretching each of the discharged melts by passing through a stretching region divided into an upper region and a lower region and having a volume of the upper region equal to or greater than 90% of the volume of the lower region (S30);

and discharging each of the elongated melts through a diffuser (S40),

The diffuser has a trapezoidal longitudinal cross-section, and a ratio of the uppermost width: the middle width: the lowermost width is 1:1.5 or more: provides a method of manufacturing a nonwoven fabric of 2.0 or more.

The manufacturing method of the nonwoven fabric may further include a step (S50) of imparting mechanical properties to the nonwoven fabric formed in the step (S40) by embossing using a heating embossing roll or heat-sealing by high-temperature ventilation.

In the method of manufacturing the nonwoven fabric, the nonwoven fabric formed in the step (S50) is supplied to a post-processing facility and a deep emboss or corrugated shape is provided by a processing roll to give a three-dimensional shape to the surface of the nonwoven fabric. Further comprising the step (S50) of, the processing roll of the post-processing facility is a 10-50 hole/inch deep embossing process through a perforation to give the nonwoven fabric a thickness of 0.3mm to 0.7mm, and 2 to 8ea A three-dimensional shape can be imparted to the surface of the nonwoven fabric through corrugated processing of /inch.

The nonwoven fabric according to an embodiment of the present invention has a fine crimp shape and a lot of crimp expression, so it has good shape safety and excellent physical quality, and in particular, softness and bulkiness can be improved.

Accordingly, the diaper including the nonwoven fabric may not damage the wearer's skin or cause a rash.

1 is a cross-sectional view of a crimped composite fiber forming a nonwoven fabric according to an embodiment of the present invention.

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

As used herein, the term "molecular weight distribution or polydispersity index" refers to a ratio (Mw/Mn) of a weight average molecular weight (Mw) to a number average molecular weight (Mn) measured by gel permeation chromatography (GPC). .

Also in this specification, "melting point" is a value measured by differential scanning calorimetry (DSC).

The nonwoven fabric according to an embodiment of the present invention includes crimped composite fibers (hereinafter simply referred to as "composite fibers").

(i) the ratio (the side B/the side A) of the side A and the side B measured according to ASTM D1238 (MFR: measured temperature 230° C., load 2.16 kg) is 0.65 to 1.51, (ii) ) The component ratio expressed by the side A/the side B (weight ratio) is 50/50 to 70/30, and (iii) the ratio of the molecular weight distribution of the side A and the side B (the side B/the side A) is It may be 0.5-1.5.

When the side A and the side B satisfy all of the above conditions (i) to (iii), the composite fiber has crimpability, and the nonwoven fabric composed of the composite fiber may have excellent softness and bulkiness.

The side A and the side B are arranged to occupy substantially respective regions within the cross-section of the composite fiber, and extend continuously along the longitudinal direction, wherein at least one of the side A and the side B comprises the composite fiber may form at least a portion of the peripheral surface continuously along the longitudinal direction of

The side A includes a first propylene-based polymer, the side B includes a second propylene-based polymer, and the first propylene-based polymer and the second propylene-based polymer may have different melt index and molecular weight distribution. have.

The first propylene-based polymer and the second propylene-based polymer may each include a propylene homopolymer.

The first propylene-based polymer may further include 1 to 5% by weight of a nucleating agent in addition to the propylene-based polymer component, which is the main component, and thus the crystallization temperature of the first propylene-based polymer is the second propylene-based polymer. It may be higher than the crystallization temperature of

The nucleating agent increases the crystallization temperature of the first propylene-based polymer to differentiate the crystallization temperature of the side A from the crystallization temperature of the side B, thereby improving the thickness of the nonwoven fabric according to the expression of the crimp to improve the softness and bulkiness of the nonwoven fabric can be further improved.

The nucleating agent may include a granular additive, a self-assembling nucleating agent, a reactive nucleating agent, or a combination thereof. The granular additive may include sodium benzoate, titanium dioxide, silica, nano clay, sodium salt, calcium titanate, metal oxide, metal hydroxide, or a combination thereof. The self-assembly 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 a metal salt, 4-biphenyl carboxylic acid, 4-biphenylmethanol, adipic acid, or a combination thereof.

The melting point of the first propylene-based polymer and the melting point of the second propylene-based polymer may be in the range of 120 to 175° C. independently of each other.

The molecular weight distribution of the first propylene-based polymer may be 2.0 to 3.0, and the molecular weight distribution of the second propylene-based polymer may be 2.5 to 3.5.

In addition, the side B may further include a third propylene-based polymer, and the second propylene-based polymer and the third propylene-based polymer may have different melt index and molecular weight distribution, respectively.

The third propylene-based polymer may include a propylene homopolymer.

The melting point of the third propylene-based polymer may be in the range of 120 to 175°C.

In addition, the molecular weight distribution of the third propylene-based polymer may be 4.0 to 5.0.

In addition, the component ratio expressed as the third propylene-based polymer/the second propylene-based polymer (weight ratio) may be greater than 0/100 to 50/50 or less.

In addition, the nonwoven fabric may have an impregnation amount (OPU) of a hydrophilic agent of 0.7% or less, and accordingly, the nonwoven fabric may have a rewetability index of 5.0 or less and a water absorption durability of 10 sec or less.

The hydrophilic agent may include a wax emulsion, a reactive softening agent, a silicone-based compound, a surfactant, or a combination thereof. The silicone-based compound may include an amino group-containing silicone, an oxyalkylene group-containing silicone, or a combination thereof. The surfactant includes anionic surfactants such as carboxylate-based anionic surfactants, sulfonate-based anionic surfactants, sulfate ester salt-based anionic surfactants, and phosphate ester salt-based anionic surfactants (especially alkyl phosphate ester salts). Surfactants; Polyhydric alcohol mono-fatty acid esters such as sorbitan fatty acid ester, diethylene glycol monostearate, diethylene glycol monooleate, glyceryl monostearate, glyceryl monooleate and propylene glycol monostearate, N-(3-oleate) Iloxy-2-hydroxypropyl) diethanolamine, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbit beeswax, polyoxyethylene sorbitan sesquistearate, polyoxyethylene monooleate, polyoxyethylene sorbitan ses Nonionics such as quistearate, polyoxyethylene glyceryl monooleate, polyoxyethylene monostearate, polyoxyethylene monolaurate, polyoxyethylene monooleate, polyoxyethylene cetyl ether, and polyoxyethylene lauryl ether Type surfactant: cationic surfactant, such as a quaternary ammonium salt, an amine salt, or an amine; amphoteric surfactants such as aliphatic derivatives of secondary or tertiary amines containing carboxy, sulfonate and sulfate, or aliphatic derivatives of heterocyclic secondary or tertiary amines; or a combination thereof.

Specifically, the hydrophilic agent may be a nonionic hydrophilic agent.

The nonionic hydrophilic agent may be a silicone-based compound such as an amino group-containing silicone or an oxyalkylene group-containing silicone; Polyhydric alcohol mono-fatty acid esters such as sorbitan fatty acid ester, diethylene glycol monostearate, diethylene glycol monooleate, glyceryl monostearate, glyceryl monooleate and propylene glycol monostearate, N-(3-oleate) Iloxy-2-hydroxypropyl) diethanolamine, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbit beeswax, polyoxyethylene sorbitan sesquistearate, polyoxyethylene monooleate, polyoxyethylene sorbitan ses Nonionics such as quistearate, polyoxyethylene glyceryl monooleate, polyoxyethylene monostearate, polyoxyethylene monolaurate, polyoxyethylene monooleate, polyoxyethylene cetyl ether, and polyoxyethylene lauryl ether Surfactants; or a combination thereof.

More specifically, the nonionic hydrophilic agent may include a surfactant (ie, a nonionic surfactant) having a solid content of 90% by weight or more.

The average diameter of the composite fiber may be 1 ~ 50㎛.

The first propylene-based polymer, the second propylene-based polymer, and the third propylene-based polymer may be prepared using a highly stereoregular polymerization catalyst.

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

The nonwoven fabric including the composite fiber can be obtained by a conventional composite melt spinning method without using a special device. For example, it may be a spunbond nonwoven fabric manufactured by a spunbonding method having excellent productivity.

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

A method for manufacturing a nonwoven fabric according to an embodiment of the present invention may include the following steps:

Forming a side A-forming melt and a side B-forming melt by melting the side A-forming polymer and the side B-forming polymer at a temperature of 180° C. to 250° C. for each section with separate extruders (S10),

Discharging each of the melts through a spinneret having a compound spinning nozzle (S20),

Step (S30) of stretching each of the discharged melts by passing through a stretching region that is divided into an upper region and a lower region and the volume of the upper region is 90% or more of the volume of the lower region (S30), and

Discharging each of the elongated melts through a diffuser (S40).

In the step S40, the diffuser may have a trapezoidal longitudinal cross-section, and a ratio of the uppermost width: the middle width: the lowermost width is 1:1.5 or more:2.0 or more. Due to the special configuration of the diffuser, the softness and bulkiness of the finally manufactured nonwoven fabric may be further improved.

In addition, the manufacturing method of the nonwoven fabric may further include a step (S50) of imparting mechanical properties to the nonwoven fabric formed in the step (S40) by embossing using a heating embossing roll or heat-sealing by high-temperature ventilation. .

For example, the embossing process may be performed under the conditions of a bonding rate (ie, embossing area ratio) of 13% or less, and a non-embossing unit area of 0.2 mm ² or more, for example, 0.2 to 0.7 mm ^{2 .} Here, the non-embossing unit area means the maximum area of a quadrangle inscribed in the embossing in the non-embossing unit of the minimum unit surrounded by the embossing unit on all sides. When embossing is performed under the conditions within this range, a nonwoven fabric having a larger bulkiness can be obtained while maintaining the required strength of the nonwoven fabric.

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 part and a non-embossing part, and the embossing part may include a plurality of unit embossing pattern parts continuously arranged at the same or different intervals in an open embossing type.

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

In addition, in the manufacturing method of the nonwoven fabric, the nonwoven fabric formed in the step (S50) is supplied to a post-processing facility to provide a deep emboss or corrugated shape by a processing roll, thereby providing a three-dimensional three-dimensional shape on the surface of the nonwoven fabric. It may further include the step of giving (S50).

In the step (S50), the processing roll of the post-processing facility is a 10-50 hole/inch deep embossing process through a perforation to give the nonwoven fabric a thickness of 0.3 mm to 0.7 mm, and a thickness of 2 to 8 ea/inch It may be configured to give a three-dimensional three-dimensional shape to the surface of the nonwoven fabric through corrugated processing. Due to the post-processing (particularly, perforation) of the step (S50), the softness and bulkiness of the finally manufactured nonwoven fabric may be further improved.

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 fatty acid amide may serve as a slip agent.

The fatty acid amide may include oleic acid amide, erucamide, stearic acid amide, or a combination thereof.

In addition to the first propylene-based polymer, the second propylene-based polymer, and/or the third propylene-based polymer, the composite fiber may contain other components as needed within a range that does not impair the object of the present invention. The other components may include known heat-resistant stabilizers, weather-resistance stabilizers, various stabilizers, antistatic agents, anti-blocking agents, anticlouding agents, fillers, dyes, pigments, natural oils, synthetic oils, waxes, or combinations thereof. .

The stabilizer may include antioxidants 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 alkylesters 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, and pentaerythritol tristearate; or a combination thereof.

The filler is silica, diatomaceous earth, alumina, titanium oxide, magnesium oxide, pumice powder, pumice ballun, 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 a combination thereof.

The above-described propylene-based polymer and the other components used as necessary may be mixed using a known method.

The composite fiber may be a side-by-side or sandwich type composite fiber.

For example, referring to FIG. 1 , the composite fiber 1 has a cross section in the thickness direction of a side A made of the first propylene polymer, and a side made of the second propylene polymer and/or the second propylene polymer. It may be a side-by-side type composite fiber containing B.

The nonwoven fabric may have a thickness of 0.25 mm or more, and the number of crimps may be 20/10 mm or more.

In addition, the nonwoven fabric may have a coefficient of friction (COF) of 0.60 or less.

The fineness and the basis weight of the nonwoven fabric may be appropriately selected according to the use, and the fineness is usually 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, It can be 7-30 g/m ^{2 .}

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

The nonwoven fabric laminate according to an embodiment of the present invention is a laminate having at least two or more layers, and at least one of them may be the above-described nonwoven fabric.

The nonwoven fabric laminate may include a spunbond nonwoven fabric among the aforementioned nonwoven fabrics.

For example, the crimped nonwoven fabric may be a spunbond nonwoven fabric, and the nonwoven fabric laminate may be configured such that the spunbond nonwoven fabric is exposed only on one side of both surface layers.

In addition, the nonwoven fabric laminate may be formed by laminating the four spunbond nonwoven fabrics, and in this case, the nonwoven fabric laminate may have a uniformity (CV%) of 3% or less. In the present specification, "uniformity (CV%)" refers to ^{a value obtained by cutting a nonwoven laminate to a size of 1 m 2} to make 30 test pieces, and 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 consisting of 4 stacked spunbond nonwoven fabrics has a thickness of 0.2 mm or more, a number of crimps of 10/10 mm or more, a bonding rate of 18% or less, and MD stiffness showing the softness of the nonwoven fabric laminate (MD stiffness) may be 50 mm or less. As used herein, "MD stiffness" refers to the bending deformation in the machine direction of the nonwoven fabric laminate (that is, the degree of warping of the nonwoven fabric laminate).

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

An article according to an embodiment of the present invention includes the above-described nonwoven laminate.

The article may be a diaper, an absorbent article, a toilet article, a support layer, a back sheet, a waistband or a top sheet.

When the article is a diaper, the nonwoven fabric laminate has a hydrophilic agent impregnation amount (OPU: Oil Pick-UP) of 0.7% or less, so that when applied to the top sheet layer of the diaper, the durable absorption rate of water may be 10 sec or less.

The hydrophilic agent impregnation amount (OPU) may be calculated according to Equation 1 below.

[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 the hydrophilic agent. In addition, in Equation 1, W1 is the sum of the weight of the nonwoven fabric laminate not containing the hydrophilic agent and the weight of only the solid component of the hydrophilic agent.

Hereinafter, the present invention will be described in more detail through examples. These examples are for explaining the present invention in more detail, and the scope of the present invention is not limited to these examples.

Examples 1 to 9 and Comparative Examples 1 to 2: Preparation of nonwoven fabric

First, the polymer for forming side A and the polymer for forming side B were melted at a temperature of 180° C. to 250° C. for each section with separate extruders to form a melt for forming side A and a melt for forming side B. Then, each of the melts was discharged through a spinneret having a compound spinning nozzle. Then, each of the discharged melt was divided into an upper region and a lower region, and the upper region was stretched by passing through a stretching region in which the volume of the lower region was 90% of the volume of the lower region. Thereafter, each of the discharged melts was discharged through a diffuser having a trapezoidal cross-sectional shape. Thereafter, mechanical properties were imparted to the formed nonwoven fabric by embossing using a hot embossing roll. Then, as an optional 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 by a processing roll. The processing roll of the post-processing facility is configured to give a three-dimensional three-dimensional shape to the surface of the nonwoven fabric by deep embossing of 30 holes/inch through perforation.

In addition, the types, physical properties, and content ratios of the polymer for forming the side A and the polymer for forming the side B are shown in Table 1 below. In Table 1 below, MFR means a melt index measured under the conditions of a temperature of 230°C and a load of 2.16 kg according to ASTM D1238.

Polymer for Forming Side A Polymer to form side B Polymer class PA1 PB1 PB2 Melting point (℃) 160 160 160 MFR (g/10 min) 35 60 25 molecular weight distribution 2.5 3.0 4.5

(1) PA1: Propylene homopolymer (LG Chem, H7700)

(2) PB1: propylene homopolymer (PMC, HP562T)

(3) PB2: propylene homopolymer (PMC, HP552R)

In addition, the types and content ratios, physical properties, diffuser dimensions (top width: middle width: bottom width) of the polymers used in Examples 1 to 9 and Comparative Examples 1 to 2, and whether perforation is shown in Table 2 below. In Table 2 below, the physical properties of the side A mean the properties of the polymer (PA1), and the properties of the side B mean the properties of the blend of the polymer (PB1) and the polymer (PB2).

Example comparative example One 2 3 4 5 6 7 8 9 One 2 side A Melting point (℃) 160 160 160 160 160 160 160 160 160 160 160 MFR
(g/10 min) 35 35 35 35 35 35 35 35 35 35 35 molecular weight distribution 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 side B Melting point (℃) 160 160 160 160 160 160 160 160 160 160 160 MFR
(g/10 min) 60 53 46 42.5 53 53 53 53 53 53 53 molecular weight distribution 3.0 3.3 3.6 3.75 3.3 3.3 3.3 3.3 3.3 3.3 3.3 PB2/PB1 weight ratio 0/100 20/
80 40/
60 50/
50 20/
80 20/
80 20/
80 20/
80 20/
80 20/
80 20/
80 Side A / Side B weight ratio 60/
40 60/
40 60/
40 60/
40 50/
50 70/
30 60/
40 60/
40 60/
40 40/
60 80/
20 Side B/Side A MFR Ratio 1.14 1.01 0.88 0.81 1.51 0.65 1.01 1.01 1.01 1.89 0.38 Side B/Side A Molecular Weight Distribution Ratio 0.80 0.88 0.96 1.00 1.32 0.57 0.88 0.88 0.88 1.98 0.33 Diffuser Dimensions One:
1.5:
2.0 One:
1.5:
2.0 One:
1.5:
2.0 One:
1.5:
2.0 One:
1.5:
2.0 One:
1.5:
2.0 One:
1.7:
2.4 One:
1.3:
1.5 One:
1.5:
2.0 One:
1.5:
2.0 One:
1.5:
2.0 perforated or not × × × × × × × × ○ × ×

Evaluation example: evaluation of physical properties of nonwoven fabric

The physical properties of each of the nonwoven fabrics prepared in Examples 1 to 9 and Comparative Examples 1 to 2 were evaluated in the following manner, and the results are shown in Table 3 below.

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

(2) Tensile strength: A tensile test was performed under the conditions of a width of 5 cm, an interval of 10 cm, and a tensile speed of 500 mm/min according to the KSK 0520 method using an Instron measuring equipment to obtain the maximum tensile load.

(3) Tensile elongation: The elongation at maximum elongation measured by the method (2) above was obtained.

(4) Coefficient of friction (COF): When a force is applied to a stationary object, the frictional force is proportional to the component force in the vertical direction of the object. At this time, the proportional constant is called the static friction coefficient, and the static friction coefficient is It is determined according to the condition and the condition of the contact surface. The static friction coefficient was measured according to KS M 3009.

(5) Thickness (mm): It was measured according to the block gauge thickness measurement method, which has a large measuring area and a minimum load.

(6) Number of crimps: The number of filament crimps within a range of 10 mm was directly measured using a microscope.

(7) Spinning: Filament shake during melt spinning was visually observed, and polymer drips were detected with a defect detector.

Example comparative example One 2 3 4 5 6 7 8 9 One 2 Tensile strength (MD)
(kgf/5cm) 3.9 3.9 3.3 3.4 3.2 3.6 3.8 4.0 3.2 3.2 3.1 Tensile strength (CD)(kgf/5cm) 1.9 1.7 1.4 1.5 1.2 1.6 1.6 1.8 1.3 1.3 1.2 Tensile Elongation (MD) (%) 75 95 91 95 98 85 95 86 100 102 105 Tensile Elongation (CD) (%) 80 112 101 105 112 90 115 95 117 11 118 Coefficient of Friction (COF) 0.55 0.38 0.36 0.38 0.40 0.50 0.37 0.54 0.35 0.57 0.59 Thickness (mm) 0.25 0.41 0.38 0.45 0.36 0.27 0.43 0.31 0.90 0.22 0.19 Number of crimps (pcs/10mm) 18 31 40 42 25 22 32 20 45 15 10 radioactive Good Good Good Good Good Good Good Good Good Good error

Referring to Table 3, it was found that the nonwoven fabrics prepared in Examples 1 to 9 had a greater thickness than the nonwoven fabrics prepared in Comparative Examples 1 and 2, a small coefficient of friction (COF), and a large number of crimps.

Although the present invention has been described with reference to the drawings and embodiments, it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible therefrom. Accordingly, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

1: Crimped composite fiber A: Side A
B: side B

Claims (14)

As a nonwoven fabric comprising a crimped type composite fiber,
The crimped composite fiber has a cross section in the thickness direction including side A and side B,
The ratio (the side B/the side A) of the side A and the side B melt index (MFR: measured temperature 230° C., load 2.16 kg) measured according to ASTM D1238 is 0.65 to 1.51,
The component ratio expressed as the side A/the side B (weight ratio) is 50/50 to 70/30,
The nonwoven fabric whose ratio (the said side B/the said side A) of the molecular weight distribution of the said side A and the said side B is 0.5-1.5. According to claim 1,
The side A includes a first propylene-based polymer, the side B includes a second propylene-based polymer, and the first propylene-based polymer and the second propylene-based polymer have melt index and molecular weight distribution different from each other. 3. The method of claim 2,
The side B further includes a third propylene-based polymer, the second propylene-based polymer and the third propylene-based polymer have different melt index and molecular weight distribution, respectively, and the third propylene-based polymer/the second propylene-based polymer A nonwoven fabric having a component ratio expressed in polymer (weight ratio) greater than 0/100 to 50/50 or less. According to claim 1,
Non-woven fabric having a thickness of 0.25 mm or more and a number of crimps of 20/10 mm or more. According to claim 1,
A nonwoven fabric having a coefficient of friction (COF) of 0.60 or less. According to claim 1,
The crimped type composite fiber is a nonwoven fabric of side-by-side type or sandwich type composite fiber. According to claim 1,
The nonwoven fabric is a spunbond nonwoven fabric. A nonwoven fabric laminate having at least two or more layers, wherein at least one layer is the nonwoven fabric according to any one of claims 1 to 7. 9. The method of claim 8,
The nonwoven fabric is a spunbond nonwoven fabric, and the nonwoven fabric laminate is configured such that the spunbond nonwoven fabric is exposed only on one side of both surface layers. An article comprising the nonwoven laminate according to claim 9 . 11. The method of claim 10,
The article is an article that is a diaper, absorbent article, defecation article, a support layer, a back sheet, a waistband or a top sheet. forming a side A-forming polymer and a side B-forming polymer by melting at a temperature of 180° C. to 250° C. for each section with separate extruders to form a side A-forming melt and a side B-forming melt (S10);
discharging each of the melts through a spinneret having a compound spinning nozzle (S20);
stretching each of the discharged melts by passing through a stretching region which is divided into an upper region and a lower region and the volume of the upper region is 90% or more of the volume of the lower region (S30);
Discharging each of the elongated melts through a diffuser (S40),
The diffuser has a trapezoidal longitudinal cross-section, and the ratio of the width of the uppermost part: the width of the middle part: the width of the lower part is 1:1.5 or more: a method of manufacturing a nonwoven fabric of 2.0 or more. 13. The method of claim 12,
The method of manufacturing a nonwoven fabric further comprising the step (S50) of imparting mechanical properties to the nonwoven fabric formed in the step (S40) by embossing using a heat embossing roll or heat-sealing by high-temperature ventilation. 14. The method of claim 13,
Supplying the nonwoven fabric formed in the step (S50) to a post-processing facility to give a three-dimensional three-dimensional shape to the surface of the nonwoven fabric by providing a deep emboss or corrugated shape by a processing roll (S50) Further comprising, the processing roll of the post-processing facility is a 10-50 hole/inch deep embossing process through a perforation to give the nonwoven fabric a thickness of 0.3 mm to 0.7 mm, and a 2 to 8 ea/inch wrinkle processing ( Corrugated) through a method of manufacturing a nonwoven fabric configured to impart a three-dimensional three-dimensional shape to the surface of the nonwoven fabric.

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