KR20210096220A - Manufacturing method of spunbond nonwoven and spunbond nonwoven - Google Patents

Abstract

The problem to be solved by the present invention is to provide a spunbond nonwoven fabric having excellent fluff resistance without impairing flexibility and a method for manufacturing the same. The method for producing a spunbond nonwoven fabric of the present invention comprises a step of melt spinning a thermoplastic polymer to form crimped fibers, collecting the crimped fibers, and linearly pressing the collected crimped fibers with compaction rolls 41 and 42. It includes a step of pressing to 5N/mm or more.

Description

Manufacturing method of spunbond nonwoven and spunbond nonwoven

The present disclosure relates to a method of making a spunbond nonwoven and a spunbond nonwoven.

In recent years, nonwoven fabrics have been widely used in various applications because of their excellent air permeability and flexibility. Therefore, while the various characteristics according to the use are calculated|required of the nonwoven fabric, the improvement of the characteristic is calculated|required.

In particular, the long fiber nonwoven fabric obtained by the spunbonding method is, for example, absorbent articles (paper diapers, sanitary napkins, etc.), medical materials (surgical wear gowns, drapes, sanitary masks, sheets, medical gauze, poultice materials, etc.) ), etc.) are applied. In applications such as absorbent articles and medical materials, in particular, high flexibility is demanded since it has a portion in direct contact with the skin.

For example, Patent Document 1 proposes a method for producing a spunbonded high loft nonwoven web containing crimped multicomponent fibers having excellent flexibility.

Japanese Patent Laid-Open No. 2018-24965

In uses, such as an absorbent article and a medical material, it is hard to generate|occur|produce fluff with high flexibility, ie, excellent fluff resistance is also calculated|required. In the manufacturing method of patent document 1 mentioned above, there exists room for improvement with respect to fluff resistance.

An object of the present disclosure is to provide a spunbond nonwoven fabric having excellent fluff resistance without impairing flexibility and a method for manufacturing the same.

This indication relates to the following aspects.

<1> A step of melt spinning a thermoplastic polymer to form crimped fibers, collecting the crimped fibers, and pressing the collected crimped fibers with a compaction roll at a linear pressure of 5 N/mm or more; A method for producing a spunbond nonwoven comprising.

<2> The method for producing a spunbond nonwoven fabric according to <1>, wherein a temperature of the compaction roll when the crimped fibers are pressed is 80°C to 120°C.

<3> The method for producing a spunbonded nonwoven fabric according to <1>, wherein the temperature of the compaction roll when pressing the crimped fiber is lower than the melting point of the crimped fiber.

<4> The manufacturing method of the spunbonded nonwoven fabric in any one of <1>-<3> whose said linear pressure is 10 N/mm or less.

<5> The method for producing a spunbond nonwoven fabric according to any one of <1> to <4>, wherein the thermoplastic polymer contains an olefinic polymer.

<6> The method for producing a spunbond nonwoven fabric according to <5>, wherein the olefin-based polymer contains a propylene-based polymer as the olefin-based polymer.

<7> On the nonwoven web formed in the pressing step, crimped fibers formed by melt spinning a thermoplastic polymer are laminated, and the nonwoven web on which the crimped fibers are laminated is pressed with a compaction roll at a linear pressure of 5N/mm or more. The manufacturing method of the spunbonded nonwoven fabric in any one of <1>-<6> which manufactures the nonwoven fabric laminated body provided with plural spunbonded nonwoven fabric layers including the process of doing.

<8> When a friction test was performed on a surface area of 150 mm × 150 mm in accordance with the friction fastness test method of JIS L 0849 (2013) using a Hakjin type friction fastness tester, the following (1) and ( 2) A spunbond nonwoven fabric satisfying at least one of.

(1) In the said area|region, the number of fluff bundles with an equivalent circle diameter of 2.0 mm or more is 0, and the number of objects whose equivalent circle diameter is 0.8 mm or more and less than 2.0 mm is one or less.

(2) In the said area|region, the number of fluff bundles with an equivalent circle diameter of 2.0 mm or more is 0, and the number of objects whose equivalent circle diameter is 0.1 mm or more and less than 0.8 mm is nine or less.

According to the present disclosure, a spunbond nonwoven fabric having excellent fluff resistance without compromising flexibility and a method for manufacturing the same are provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic schematic diagram which shows an example of the apparatus for manufacturing the nonwoven fabric laminated body of this indication.
It is a schematic schematic diagram which shows another example of the apparatus for manufacturing the nonwoven fabric laminated body of this indication.

Hereinafter, with respect to this indication, an example of preferable embodiment is demonstrated in detail. These descriptions and examples are illustrative of the embodiments and do not limit the scope of the embodiments.

In the present disclosure, the numerical range indicated using "-" indicates a range including the numerical values described before and after "-" as the minimum value and the maximum value, respectively.

In the present disclosure, the term "step" is included in this term as long as the purpose of the step is achieved not only as an independent step but also in a case where it cannot be clearly distinguished from other steps.

In the present disclosure, the content of each component in the composition means the total amount of the plurality of types of substances, unless otherwise specified, when a plurality of types of substances corresponding to each component exist.

In this indication, MD (Machine Direction) direction points out the advancing direction of the nonwoven web in a nonwoven fabric manufacturing apparatus. The CD (Cross Direction) direction is perpendicular to the MD direction and refers to a direction parallel to the main surface (plane orthogonal to the thickness direction of the nonwoven fabric).

<Method for producing spunbond nonwoven fabric>

The method for producing a spunbond nonwoven fabric of the present disclosure includes a step of melt spinning a thermoplastic polymer to form crimped fibers, collecting the crimped fibers, and using a compaction roll to collect the crimped fibers with a linear pressure of 5N/mm or more. A step of pressing (hereinafter also referred to as “step (1) of pressing the crimped fibers”) is included.

The manufacturing method of the present disclosure includes a step of pressing the collected crimped fibers with a compaction roll at a linear pressure of 5 N/mm or more, thereby producing a spunbond nonwoven fabric having excellent fluff resistance without compromising flexibility. .

[Process of forming crimped fibers]

The manufacturing method of the present disclosure includes a step of melt spinning a thermoplastic polymer to form crimped fibers. The step of forming the crimped fibers is not particularly limited as long as the crimped fibers can be formed, and a known step of cooling and stretching the thermoplastic polymer may be included.

The thermoplastic polymer used in the manufacturing method of the present disclosure is as described below.

[Step (1) of pressing the crimped fiber]

The manufacturing method of the present disclosure includes a step of collecting crimped fibers and pressing the collected crimped fibers with a compaction roll at a linear pressure of 5 N/mm or more.

The temperature of the compaction roll at the time of pressing the crimped fibers may be 80°C to 120°C, 85°C to 115°C, 90°C to 110°C, or 95°C to 105°C.

It is preferable that the temperature of the compaction roll at the time of pressing the crimped fiber is lower than the melting point of the crimped fiber.

It is preferable that it is 5.1 N/mm or more from a viewpoint of fluff resistance, and, as for the linear pressure at the time of pressing a crimped fiber, it is more preferable that it is 5.2 N/mm or more.

The linear pressure at the time of pressing the crimped fiber is preferably 10 N/mm or less from the viewpoint of flexibility, more preferably 7.0 N/mm or less, still more preferably 6.5 N/mm or less, and 6.0 N/mm or less, particularly desirable.

The nonwoven fabric laminate of the present disclosure may have a crimping portion and a non-pressing portion from the viewpoint of excellent flexibility. It is preferable that the area ratio of the crimping|compression-bonding part is 7 % - 20 %. The area ratio of the crimping portion is more preferably 8% or more and 18% or less. As for the area ratio of the compression part, a test piece having a size of 10 mm × 10 mm is taken from the nonwoven fabric laminate, and the contact surface of the test piece with the embossing roll is observed with an electron microscope (magnification: 100 times), and the observed nonwoven fabric is thermocompression bonded. It is the ratio of the area of the part.

(thermoplastic polymer)

The thermoplastic polymer is not particularly limited as long as it can constitute a spunbond nonwoven fabric. Examples of the thermoplastic polymer include an olefin-based polymer, a polyester-based polymer, a polyamide-based polymer, and a polymer composition of these polymers. An olefinic polymer is a polymer containing an olefin as a structural unit. A polyester-based polymer is a polymer containing an ester as a structural unit, and a polyamide-based polymer is a polymer containing an amide as a structural unit. In addition, in this indication, a thermoplastic polymer is a concept containing a thermoplastic polymer composition.

Among these, it is preferable that an olefin type polymer is included, and, as for a thermoplastic polymer, it is more preferable that a propylene type polymer is included as an olefin type polymer.

The propylene-based polymer is, for example, a homopolymer of propylene, and a random copolymer of propylene/α-olefin (eg, a random copolymer of propylene and one or two or more α-olefins having 2 to 8 carbon atoms). is preferable Specific examples of preferable α-olefins from the viewpoint of excellent flexibility include propylene, ethylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 4-methyl-1-pentene, and the like. The content of α-olefin in the propylene/α-olefin random copolymer is not particularly limited, and for example, it is preferably 1 mol% to 10 mol%, and more preferably 1 mol% to 5 mol%. .

125 degreeC or more may be sufficient as melting|fusing point (Tm) of a propylene-type polymer, and 125 degreeC - 165 degreeC may be sufficient as it. The melt flow rate (MFR) (ASTM D-1238, 230°C, load 2160 g) may be 10 g/10 min to 100 g/10 min, or 20 g/10 min to 70 g/10 min.

The crimped fiber used in the manufacturing method of this indication may be a fiber containing one type of thermoplastic polymer, and the composite fiber containing two or more types of thermoplastic polymers may be sufficient as it. In addition, the composite fiber may be, for example, a side-by-side type, a concentric sheath type, or an eccentric core sheath type. The eccentric core-sheath composite fiber may be an exposed type in which a core is exposed on the surface, or may be an unexposed type in which a core is not exposed on the surface.

Among them, the crimped fiber is preferably a crimped composite fiber containing a propylene-based polymer, and more preferably an eccentric core-sheath crimped composite fiber containing a propylene-based polymer.

In the same way, in the crimped composite fiber, the propylene-based polymer is included on the side exposed to the surface of the crimped composite fiber, and the propylene-based polymer is a propylene/α-olefin copolymer, or a propylene homopolymer and propylene. It is more preferably a mixture of /α-olefin copolymers. The side with many parts exposed on the surface represents the side where more thermoplastic polymers are exposed in the crimped composite fiber. In this indication, the side with many parts exposed to the surface is collectively called, and the sheath part is called. In addition, the side with few parts exposed to the surface is generically called, and a deep part is called.

When the crimped composite fiber is a core sheath type, a preferred aspect of the mass ratio (core/sheath) of the sheath to the core is, for example, 90/10 to 60/40 (more preferably 85/15 to 40/60). there is.

The crimped fiber may contain the additive normally used as needed. Examples of the additive include antioxidants, weathering stabilizers, light stabilizers, dispersing agents, antistatic agents, antifogging agents, antiblocking agents, lubricants, nucleating agents, pigments, penetrating agents and wetting agents.

As for the spunbonded nonwoven fabric obtained by the manufacturing method of this indication, it is preferable that the tensile loads of the MD direction of a spunbonded nonwoven fabric are 10N/25mm - 30N/25mm, and it is more preferable that they are 15N/25mm - 25N/25mm.

As for the spunbond nonwoven fabric obtained by the manufacturing method of this indication, it is preferable that the tensile loads of the CD direction of the spunbonded nonwoven fabric are 5N/25mm - 20N/25mm, and it is more preferable that they are 10N/25mm - 15N/25mm.

The spunbond nonwoven fabric obtained by the manufacturing method of the present disclosure preferably has a tensile strength of 2.0N/25mm or more, more preferably 3.0N/25mm or more, when the spunbonded nonwoven fabric is stretched 5% in the MD direction.

The spunbonded nonwoven fabric obtained by the manufacturing method of the present disclosure preferably has a tensile strength of 0.5N/25mm or more, more preferably 0.8N/25mm or more, when the spunbonded nonwoven fabric is stretched 5% in the CD direction.

With respect to the spunbond nonwoven fabric, the tensile load and tensile strength at 5% elongation may be measured in accordance with JIS L 1913 (2010). Specifically, a test piece having a width of 25 mm x a length of 200 mm is taken from the spunbond nonwoven fabric, and MD: 5 points are measured using a tensile tester at a distance between chucks of 100 mm and a head speed of 100 mm/min, and the average value is calculated, and the tensile load (N/25mm) Incidentally, in the measurement program, the strength recorded at the time of 5% elongation (between chucks: 105 mm) may be taken as the load at 5% elongation (5% load).

The basis weight of the spun-bonded non-woven fabric obtained by the manufacturing method of the present disclosure is not particularly limited, for example, the basis weight of the spunbond nonwoven fabric, and even ^{5g / m 2 ~30g / m 2} , 20g / m 2 ~30g / m 2 may be used, or 25 g/m ^{2 to} 30 g/m ² may be sufficient.

Tensile load in MD direction of spunbond nonwoven fabric, tensile load in CD direction of spunbond nonwoven fabric, tensile strength at 5% elongation of MD direction of spunbond nonwoven fabric, tensile strength at 5% elongation in CD direction of spunbond nonwoven fabric, And the basis weight of the spunbond nonwoven fabric can be calculated|required by the method as described in an Example.

The average fiber diameter of the crimped fibers is not particularly limited, and may be, for example, 5 µm to 25 µm. The average fiber diameter may be 20 µm or less, 18 µm or less, or 15 µm or less. Moreover, 7 micrometers or more may be sufficient as an average fiber diameter, and 10 micrometers or more may be sufficient as it. In addition, in this indication, an average fiber diameter is calculated|required as follows. From the obtained spunbond nonwoven fabric, 10 test pieces of 10 mm x 10 mm are taken, and the diameter of the fiber is read to one decimal place in μm at a magnification of 20 times using an ECLIPSE E400 microscope manufactured by Nikon Corporation. The diameter of 20 arbitrary places is measured for every 1 test piece, and an average value is calculated|required.

The spunbond nonwoven fabric obtained by the manufacturing method of this indication may be a single layer nonwoven fabric, and the multilayer nonwoven fabric (nonwoven fabric laminated body) in which several layers were laminated|stacked may be sufficient as it. As a nonwoven fabric laminated body, the laminated body in which two or more layers of spunbond nonwoven fabric layers were laminated|stacked may be sufficient, for example.

[Step (2) of pressing the crimped fiber]

In the manufacturing method of the present disclosure, the crimped fibers formed by melt spinning a thermoplastic polymer are laminated on the nonwoven web formed in the step (1) of pressing the crimped fibers, and the nonwoven web on which the crimped fibers are laminated is formed by a compaction roll. , the step of pressing at a linear pressure of 5 N/mm or more may be included. Thereby, the nonwoven fabric laminated body provided with two spunbonded nonwoven fabric layers can be manufactured. Preferred conditions in the step (2) of pressing the crimped fibers are the same as the preferred conditions in the step (1) of pressing the crimped fibers, and therefore the description is omitted.

In addition, you may manufacture the nonwoven fabric laminated body provided with 3 or more layers of spunbonded nonwoven fabric layers by repeating the process (2) of pressing a crimped fiber.

[Process of bridging the nonwoven web]

The manufacturing method of the present disclosure may include, after the step (1) of pressing the crimped fibers, a step of entangling the nonwoven web by heat-pressing treatment. When the spunbond nonwoven fabric obtained by the manufacturing method of the present disclosure is a nonwoven fabric laminate, after the step (2) of pressing the crimped fibers, a step of entangling the nonwoven web by heat-pressing treatment may be included.

Here, with reference to FIG. 1, the manufacturing method of the nonwoven fabric laminated body of this indication is demonstrated. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic schematic diagram which shows an example of the apparatus for manufacturing the nonwoven fabric laminated body of this indication. The nonwoven fabric manufacturing apparatus 100 shown in FIG. 1 is equipped with the 1st radiation part 11A and the 2nd radiation part 11B. The first radiation portion 11A and the second radiation portion 11B have the same constituent parts. The same code|symbol is attached|subjected to the same component in the 1st radiation part 11A and the 2nd radiation part 11B, and description is abbreviate|omitted.

The nonwoven fabric manufacturing apparatus 100 includes a first extruder 31A for extruding a thermoplastic polymer, a second extruder 31B for extruding a thermoplastic polymer, a spinneret 33 for melt spinning a molten thermoplastic polymer, and spinning; The ejector 37 for drawing the continuous fiber group 20 (20A, 20B) melt-spun from the spinneret 33, the moving collection member 51 for collecting the drawn continuous fiber group 20, and the continuous fiber group A suction unit 39 for efficiently collecting the 20 on the moving collecting member 51, compaction rolls 41 and 42 for pressing the continuous fiber group 20, and an embossing roll for thermocompression bonding ( 53), a flat roll 55, and a winder 71 for winding the nonwoven fabric laminate 60 after thermocompression bonding. The compaction rolls 41 and 42 are rollers for pre-processing for unifying the light fibers so that the fibers can withstand the post-process (eg, thermocompression bonding with the embossing roll 53). .

In the first spinning section 11A, first, a thermoplastic polymer is melt-spun from a spinneret 33 to form a continuous fiber group 20A. By extruding the first thermoplastic polymer from the first extruder 31A, extruding the second thermoplastic polymer from the second extruder 31B, and performing composite spinning, a continuous fiber group 20A serving as a crimped fiber is obtained. Next, the continuous fiber group 20A is cooled by the cooling wind 35 and drawn by the ejector 37 . The drawn continuous fiber group 20A is efficiently collected on the moving collecting member 51 by the suction unit 39 provided below the collecting surface of the moving collecting member 51 . The collected continuous fiber group 20A is pressed by the vertically upper compaction roll 41 and the vertically lower compaction roll 42 to a linear pressure of 5 N/mm or more, whereby the first nonwoven web 40A this is formed

In the second spinning portion 11B, a continuous fiber group 20B is formed in the same manner. A continuous group of fibers 20B is laminated onto the first nonwoven web 40A. The first nonwoven web 40A on which the continuous fiber group 20B is laminated is pressed by the compaction rolls 41 and 42 to a linear pressure of 5 N/mm or more, thereby forming a second nonwoven web 40B, , a laminated nonwoven web is formed. The first nonwoven web 40A is the lower nonwoven web layer and the second nonwoven web 40B is the upper nonwoven web layer. The nonwoven web of the laminated structure is thermocompression-bonded by the embossing roll 53, and the nonwoven fabric laminated body 60 provided with two spunbond nonwoven fabric layers is obtained. Thereafter, the nonwoven fabric laminate 60 is wound by a winder 71 .

Moreover, in the manufacturing method of the nonwoven fabric laminated body of this indication, you may use the manufacturing apparatus with which the cooling chamber shown in FIG. 2 was equipped with the radiating part 12 of a closed structure. It is a schematic schematic diagram which shows another example of the apparatus for manufacturing the nonwoven fabric laminated body of this indication. FIG. 2 : has shown the apparatus which replaced the radiation part 11 (the radiation part 11A and the radiation part 11B) in the nonwoven fabric manufacturing apparatus 100 shown in FIG. 1 with the radiation part 12. As shown in FIG. That is, the structure of the apparatus other than the radiation part 11 is the same as that of the manufacturing apparatus shown in FIG. In addition, the same code|symbol is attached|subjected to the structural part same as that of the manufacturing apparatus shown in FIG. 1, and description is abbreviate|omitted. The compaction rolls 41 and 42 are omitted in FIG. 2 .

The spinning unit 12 includes a first extruder 32A for extruding the first thermoplastic polymer, a second extruder 32B for extruding the second thermoplastic polymer, and the molten, first and second thermoplastic polymers. The spinneret 34 for melt spinning, the cooling chamber 38C for cooling the continuous fiber group 22 melt-spun from the spinneret 34, and cooling air supply units 38A and 38B for supplying the cooling wind 36 ) and a stretching portion 38D for stretching the continuous fiber group 22 .

In the spinneret 12 , the first and second thermoplastic polymers are extruded and introduced into the spinneret 34 . Next, the molten, first and second thermoplastic polymers are melt spun from a spinneret 34 . The melt-spun continuous fiber group 22 is introduced into the cooling chamber 38C. The continuous fiber group 22 is cooled by the cooling wind 36 supplied from either or both of the cooling wind supply unit 38A and the cooling wind supply unit 38B. The cooled continuous fiber group 22 is introduced into the extending section 38D provided on the downstream side of the cooling chamber 38C. The extending|stretching part 38D is provided in the shape of an arrow. As the speed of the cooling wind increases in the path, the continuous fiber group 22 introduced into the drawing section 38D is drawn. The drawn continuous fiber group 22 is dispersed and collected on the moving collecting member 51 . Then, the dispersed continuous fiber group 22 is efficiently collected on the moving collecting member 51 by the suction unit 39 provided under the collecting surface of the moving collecting member 51, and the nonwoven web (43) is formed.

<Spunbond nonwoven fabric>

The spunbond nonwoven fabric of the present disclosure is subjected to a friction test in accordance with the friction fastness test method of JIS L 0849 (2013) using a Hakjin type friction fastness tester for an area of 150 mm × 150 mm on the surface. At least one of (1) and (2) is satisfied.

(1) In the said area|region, the number of fluff bundles with an equivalent circle diameter of 2.0 mm or more is zero, and the number of objects whose equivalent circle diameter is 0.8 mm or more and less than 2.0 mm is one or less.

(2) In the said area|region, the number of fluff bundles with an equivalent circle diameter of 2.0 mm or more is 0, and the number of objects whose equivalent circle diameter is 0.1 mm or more and less than 0.8 mm is nine or less.

The spunbond nonwoven fabric of the present disclosure is excellent in fluff resistance without impairing flexibility. The spunbond nonwoven fabric of the present disclosure can be manufactured by, for example, the manufacturing method of the present disclosure described above. Since the preferable conditions of the spunbonded nonwoven fabric of this indication are the same as that of the spunbond nonwoven fabric obtained by the manufacturing method of this indication mentioned above, description is abbreviate|omitted. On the other hand, the method of the friction test will be described in detail in the following examples.

<Laminate>

The spunbonded nonwoven fabric of this indication is good also as a laminated body provided with the spunbond nonwoven fabric of this indication. That is, the laminate may have a structure in which the spunbond nonwoven fabric of the present disclosure and other layers other than the spunbond nonwoven fabric of the present disclosure are laminated. One layer may be sufficient as another layer, and two or more layers may be sufficient as it.

As another layer, fiber aggregates, such as a knitted fabric, a woven fabric, and nonwoven fabrics (short fiber nonwoven fabric, long fiber nonwoven fabric) other than the spunbonded nonwoven fabric of this indication are mentioned. Nonwoven fabrics other than the spunbond nonwoven fabric of the present disclosure include various known nonwoven fabrics (spunbonded nonwoven fabric, meltblown nonwoven fabric, wetted nonwoven fabric, dry nonwoven fabric, dry pulp nonwoven fabric, flash spinning nonwoven fabric, opened nonwoven fabric, etc.). The fiber aggregate may be a sheet-like article of natural fibers such as cotton. Moreover, as another layer, resin films, such as polyolefin, polyester, and polyamide, etc. are mentioned. These may be laminated in combination. For example, the spunbond nonwoven fabric of the present disclosure, a resin film, and a fiber aggregate of natural fibers such as cotton may be laminated in this order.

As the film to be laminated with the spunbond nonwoven fabric of the present disclosure, when the laminate requires air permeability, a breathable film and a moisture permeable film are preferable.

As the air-permeable film, various well-known air-permeable films are mentioned. For example, a film of a thermoplastic elastomer such as a polyurethane-based elastomer having moisture permeability, a polyester-based elastomer, and a polyamide-based elastomer, a porous film formed by stretching a thermoplastic resin film containing inorganic particles or organic particles to make it porous, etc. can be heard Examples of the thermoplastic resin used for the porous film include polyolefins such as high-pressure low-density polyethylene, linear low-density polyethylene (so-called LLDPE), high-density polyethylene, polypropylene, polypropylene random copolymer, and combinations thereof.

When the laminate does not require air permeability, one or more non-porous thermoplastic resin films selected from polyolefin (polyethylene, polypropylene, etc.), polyester, and polyamide may be used.

A method of further laminating (bonding) another layer to the spunbond nonwoven fabric of the present disclosure is not particularly limited, and thermal fusion methods such as thermal embossing and ultrasonic welding, needle punching, mechanical bonding such as water jet, etc. Various methods, such as a method using adhesives, such as a lock method, a hot melt adhesive, and a urethane adhesive, and extrusion lamination, are mentioned.

Example

Hereinafter, the present invention will be described more specifically based on Examples, but the present invention is not limited to these Examples. In addition, in the following examples, "%" represents mass %.

The physical property values, etc. in an Example and a comparative example were measured with the following method.

(1) Basis weight [g/m ² ]

From the obtained nonwoven fabric laminate, 10 specimens of 100 mm (flow direction: MD) x 100 mm (direction orthogonal to the flow direction: CD) were sampled. The sampling site of the test piece was made into 10 places over the CD direction. Next, the mass [g] of each sample was measured using the upper plate electronic balance (made by Kensei Kogyo Co., Ltd.) about each sampled sample. The average value of the mass of each test piece was calculated|required. From the calculated average value ^{, it was converted into mass [g] per 1 m 2} , rounded to two decimal places, and the basis weight [g/m ² ] of each nonwoven fabric laminate sample was obtained.

The results are shown in Table 1.

(2) Thickness [mm]

From the obtained nonwoven fabric laminated body, 10 test pieces of 100 mm (MD) x 100 mm (CD) were extract|collected. The collection place of the test piece was made into the same place as the test piece for a basis weight measurement. Next, thickness [mm] was measured by the method described in JIS L 1096:2010 using a load-type thickness meter (manufactured by Ozaki Seisakusho) for each sampled specimen. The average value of the thickness of each test piece was calculated|required, and it was set as the thickness [mm] of each nonwoven fabric laminated body sample by rounding off to two decimal places.

A result is shown in Table 1.

(4) Lecture diagram (cantilever method)

The cantilever test was performed by the following method, and the stiffness [mm] of the nonwoven fabric laminate was measured.

Specifically, in accordance with JIS-L1096:2010 8.19.1 [Method A (45° cantilever method)], the stiffness is measured in each of the MD direction and the CD direction, and the average value is the stiffness of the nonwoven fabric laminate. made the road

A result is shown in Table 2.

(5) Evaluation of fluff occurrence

Two CD test pieces each of 150 mm (MD) x 150 mm (CD) were sampled from the nonwoven fabric. In addition, the collection|collection place was made into arbitrary two places. Next, using the Hakjin type friction fastness tester (made by Daiei Chemical Seiki Seiki Co., Ltd., new model NR-100), each sampled specimen was subjected to a friction test based on the friction fastness test method of JIS L 0849. On the other hand, a cloth tape (manufactured by Teraoka Seisakusho, No. 1532) was affixed to the friction element side, and under a load of 300 g, the non-embossed surface was reciprocated in the MD direction 100 times and rubbed, and the The fluff generation state was graded on the basis of the following criteria, and the one with the worse grade was made into the fluff generation|occurrence|production [evaluation point] of each nonwoven fabric sample.

A result is shown in Table 2.

The evaluation criteria of fluff generation|occurrence|production are as follows. On the other hand, it is excellent in fluff resistance as it is evaluation point 3 or more (3rd grade or more).

-Evaluation of fluff occurrence-

Grade 1: The fibers are peeled off to the extent that the specimen is damaged and there are holes.

Class 2: If the test piece is a laminate, the surface layer peels off and becomes thin enough to show two layers, or if it is a single layer, the fibers are severely peeled off.

Grade 2.5: The fluff bundle (diameter: 2mm or more) is large and clearly visible, and the fibers begin to float in multiple places.

Grade 3: A clear fluff cluster (diameter: 0.8 mm or more) begins to appear, or multiple small fluff clusters (diameter: less than 0.8 mm) are seen.

Class 3.5: Fluff is generated to such an extent that small fluff bundles (diameter: 0.1 mm or more and less than 0.8 mm) begin to form in one place.

Grade 4: No fluff.

<Example 1>

The thermoplastic polymer as the following core component and the thermoplastic polymer as the following sheath component were subjected to composite melt spinning by the spunbonding method. Then, an eccentric core-sheath crimped composite fiber having a mass ratio of core component/sheath component of 15/85 was deposited on the moving collecting surface. This crimped composite fiber was pressed at a linear pressure of 5.5 N/mm using a compaction roll at 100°C to form a first spunbond nonwoven web (1st layer). Then, on the first spunbond nonwoven web, an eccentric core-sheath crimped composite fiber obtained under the same conditions as described above was deposited, and the first spunbond nonwoven web on which the crimped composite fiber was deposited was applied to the first spunbond nonwoven web using a compaction roll at 100°C. and pressed at a linear pressure of 5.5 N/mm to form a second spunbond nonwoven web (second layer). The laminated structure of the two-layer structure was thermocompression-bonded at 150° C. so that the flat roll was in contact with the first spunbond nonwoven web side and the embossed roll was in contact with the second spunbond nonwoven web side, and the nonwoven laminate (spunbond nonwoven layer/spun bonded nonwoven fabric layer). The total basis weight of the nonwoven fabric laminate was 27.0 g/m ² , and the area ratio of the compression part was 12.9%.

-Core ingredient-

MFR: 60 g/10 min, propylene homopolymer with a melting point of 162°C

-Candle Ingredients-

Propylene/ethylene random copolymer having an MFR of 60 g/10 min, a melting point of 142° C., and an ethylene content of 4% by mass.

<Example 2>

The linear pressure when pressing the crimped composite fiber, the first spunbond nonwoven web on which the crimped composite fiber is deposited, and the laminated structure on which the crimped composite fiber is deposited using a compaction roll was changed from 5.5N/mm to 5.8N/mm Except that, it carried out similarly to Example 1, and obtained the nonwoven fabric laminated body. The total basis weight of the nonwoven fabric laminate was 27.0 g/m ² , and the area ratio of the compression part was 12.9%.

<Comparative Example 1>

The linear pressure at the time of pressing the crimped composite fiber, the first spunbond nonwoven web on which the crimped composite fiber is deposited, and the laminated structure on which the crimped composite fiber is deposited using a compaction roll was changed from 5.5N/mm to 4.8N/mm. Except that, it carried out similarly to Example 1, and obtained the nonwoven fabric laminated body. The total basis weight of the nonwoven fabric laminate was 27.0 g/m ² , and the area ratio of the compression part was 12.9%.

From the above results, the nonwoven fabric laminate obtained in Examples 1 and 2 was more favorable in evaluation of fluff generation than the nonwoven fabric laminate obtained in Comparative Example 1, and was excellent in fluff resistance. In addition, the nonwoven fabric laminate obtained in Examples 1 and 2 had the same degree of flexibility as the nonwoven fabric laminate obtained in Comparative Example 1, and in Examples 1 and 2, the occurrence of fluff could be suppressed without compromising the flexibility. there was.

All documents, patent applications, and technical standards described in this specification are hereby incorporated by reference to the same extent as if each individual document, patent application, and technical standard were specifically and individually indicated to be incorporated by reference. .

Claims (8)

Melt spinning a thermoplastic polymer to form crimped fibers;
and collecting the crimped fibers and pressing the collected crimped fibers with a compaction roll at a linear pressure of 5 N/mm or more. The method of claim 1,
The temperature of the compaction roll at the time of pressing the said crimped fiber is 80 degreeC - 120 degreeC, The manufacturing method of a spunbonded nonwoven fabric. The method of claim 1,
A method for producing a spunbond nonwoven fabric wherein the temperature of the compaction roll at the time of pressing the crimped fiber is lower than the melting point of the crimped fiber. 4. The method according to any one of claims 1 to 3,
The method for producing a spunbond nonwoven fabric wherein the linear pressure is 10N/mm or less. 5. The method according to any one of claims 1 to 4,
The thermoplastic polymer is a method of manufacturing a spunbond nonwoven fabric comprising an olefin-based polymer. 6. The method of claim 5,
The method for producing a spunbond nonwoven fabric wherein the olefin-based polymer comprises a propylene-based polymer as the olefin-based polymer. 7. The method according to any one of claims 1 to 6,
On the nonwoven web formed in the pressing step, crimped fibers formed by melt spinning a thermoplastic polymer are laminated, and the nonwoven web on which the crimped fibers are laminated is pressed with a compaction roll at a linear pressure of 5 N/mm or more. Including, a method for producing a spunbond nonwoven fabric for manufacturing a nonwoven fabric laminate having a plurality of spunbonded nonwoven fabric layers. When a friction test was performed on a surface area of 150 mm × 150 mm in accordance with the friction fastness test method of JIS L 0849 (2013) using a Hakjin type friction fastness tester, one of the following (1) and (2) A spunbond nonwoven fabric that satisfies at least one of them.
(1) In the above region, the number of fluff bundles having an equivalent circle diameter of 2.0 mm or more is 0, and the number of fluff bundles having an equivalent circle diameter of 0.8 mm or more and less than 2.0 mm is one or less.
(2) In the said area|region, the number of fluff bundles with an equivalent circle diameter of 2.0 mm or more is 0, and the number of objects whose equivalent circle diameter is 0.1 mm or more and less than 0.8 mm is nine or less.

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