TWI749293B - Laminated non-woven fabric - Google Patents

Abstract

The present invention provides a non-woven fabric, which is a non-woven fabric composed of fibers containing polyolefin resin, has both water resistance and flexibility, and has excellent processability. The present invention relates to a laminated nonwoven fabric, which is formed by laminating a spunbonded nonwoven fabric composed of fibers containing polyolefin resin (A) and a meltblown nonwoven fabric composed of fibers containing polyolefin resin (B) The melt flow rate of the aforementioned laminated non-woven fabric is 80~850g/10 minutes, the surface roughness SMD of at least one side according to the KES method is 1.0~2.6μm, and the water pressure resistance per unit area weight is 15mmH ₂ O /(g/m ² ) or more.

Description

Laminated non-woven fabric

The present invention relates to a laminated non-woven fabric, which is composed of fibers containing polyolefin resin, has excellent water resistance and flexibility, and has excellent moldability as a building material.

In recent years, non-woven fabrics have been used in various applications, and growth is expected in the future. The use of non-woven fabrics is used in a wide range of applications such as industrial materials, civil materials, building materials, living materials, agricultural materials, sanitary materials, and medical materials.

As the use of non-woven fabrics, the use of building materials is attracting attention. In recent years, in buildings such as wooden houses, a ventilation layer is provided between the outer wall material and the heat insulation material, and the ventilation layer construction method that discharges the moisture that has penetrated into the wall to the outside through the ventilation layer is becoming popular. In this breathable layer construction method, as the housing covering material of the moisture-permeable waterproof sheet that has both the water resistance to prevent rainwater from penetrating from the outside of the building and the moisture permeability to release the moisture generated in the wall to the outside, the woven fabric is used. Sticky non-woven fabric.

Although spunbonded nonwovens have excellent moisture permeability from their structure, they have the problem of poor water resistance. Therefore, the spunbonded nonwoven fabric and a film with excellent water resistance are laminated and integrated to form a moisture-permeable waterproof sheet, which is used as a house covering material.

The housing cladding material is constructed by fixing it to the base material with staples (also called nail gun needles, staples). It is required to have long-term durability and excellent weather resistance under high temperature and low temperature conditions, and it can withstand long-term durability. The durability of use (hydrolysis resistance) and the moldability during construction are excellent.

In the past, as a moisture-permeable waterproof sheet used in such a housing cladding material, a housing cladding material has been proposed. In order to achieve a good balance between moisture permeability and water resistance, a single fiber diameter of 3-28 microns and a unit a basis weight of 5 ~ 50g / m ² polyester-based non-woven fabric, non-woven on this block comprises a laminate having a hard segment and the soft segment of the polyester copolymerized thickness of 7 to 60 microns film (see Patent Document 1 ).

[Prior Technical Literature] [Patent Literature]

Patent Document 1: Japanese Invention Patent No. 3656837

However, the conventional house covering material is a laminate of a non-woven fabric and a film, and therefore has the problem of sheet hardness and poor moldability. The hardness of the sheet is due to the film. Although reducing the ratio of the laminated film is an effective means, from the viewpoint of water resistance, the reduction of the film ratio has its limit.

Therefore, the object of the present invention was accomplished in view of the above-mentioned circumstances, and its object is to provide a non-woven fabric that has both water resistance and flexibility and excellent moldability even if there is no conventional film.

In order to achieve the above-mentioned object, the inventors have repeated their dedicated and dedicated examinations, and as a result, obtained the following knowledge and insights: By using a spunbonded non-woven fabric layer composed of fibers containing polyolefin resin and fibers containing polyolefin resin The formed layered nonwoven fabric is formed by laminating the melt blown nonwoven fabric layers, and the fluidity of the fibers constituting the respective nonwoven layers can be appropriately controlled to improve the mechanical properties of the laminated nonwoven fabric. Furthermore, it has also been found that the laminated non-woven fabric can be provided with a high level of water resistance, flexibility, and processability for the purpose.

The present invention was completed based on these knowledge and knowledge. According to the present invention, the following inventions can be provided.

The laminated nonwoven fabric of the present invention is a laminated layer formed by laminating a spunbonded nonwoven fabric layer composed of fibers containing polyolefin resin (A) and a meltblown nonwoven fabric layer composed of fibers containing polyolefin resin (B) Non-woven fabric, the melt flow rate of the aforementioned laminated non-woven fabric is 80~850g/10 minutes, the surface roughness SMD of at least one side according to the KES method is 1.0~2.6μm, and the water pressure resistance per unit area weight is 15mmH ₂ O/( g/m ² ) or more.

According to a preferred aspect of the laminated nonwoven fabric of the present invention, the average single fiber diameter of the fibers comprising the polyolefin resin (A) constituting the spunbonded nonwoven fabric layer is 6.5 to 11.9 μm.

According to a preferred aspect of the laminated nonwoven fabric of the present invention, the content of the meltblown nonwoven fabric layer is 1% by mass to 15% by mass relative to the mass of the laminated nonwoven fabric.

According to the preferred aspect of the laminated non-woven fabric of the present invention, the average friction coefficient MIU of at least one side according to the KES method is 0.1 to 0.5.

According to the preferred aspect of the laminated non-woven fabric of the present invention, the variation MMD of the average friction coefficient of at least one side according to the KES method is 0.008 or less.

According to a preferred aspect of the laminated nonwoven fabric of the present invention, the polyolefin resin (A) contains a fatty acid amide compound having a carbon number of 23 or more and 50 or less.

According to a preferred aspect of the laminated non-woven fabric of the present invention, the addition amount of the aforementioned fatty acid amide compound is 0.01 to 5.0% by mass.

According to a preferred aspect of the laminated non-woven fabric of the present invention, the aforementioned fatty acid amide compound is ethylene distearate.

According to the present invention, a laminated non-woven fabric can be obtained, which is composed of fibers containing a polyolefin resin, is excellent in water resistance and flexibility, and is excellent in processability. Because of these characteristics, the laminated non-woven fabric of the present invention is particularly suitable for use as a construction material such as a moisture-permeable waterproof sheet.

Since the laminated non-woven fabric of the present invention is excellent in water resistance, when used as a moisture-permeable waterproof sheet, compared with the conventional laminated non-woven fabric, the weight per unit area can be reduced.

Furthermore, in addition to reducing the weight of the film to be laminated for the purpose of water resistance, it can also be used for applications requiring high water resistance where conventional laminated non-woven fabrics are difficult to apply.

Furthermore, since it is excellent in flexibility, when it is used as a building material, wrinkles are less likely to occur in the step of bonding, and the moldability becomes good.

[The form of implementing the invention]

The laminated nonwoven fabric of the present invention is a laminated nonwoven fabric, which is a spunbonded nonwoven fabric layer composed of fibers containing polyolefin resin (A) and a meltblown nonwoven fabric layer composed of fibers containing polyolefin resin (B) Laminated non-woven fabric, in which the melt flow rate of the aforementioned laminated non-woven fabric is 80~850g/10 minutes, and the surface roughness SMD of at least one side according to the KES method (Kawabata Evaluation System, Kawabata Evaluation System) is 1.0~2.6 μm, and the water pressure resistance per unit area weight is 15mmH ₂ O/(g/m ² ) or more. The details will be described in detail below.

[Polyolefin resin (A), polyolefin resin (B)]

Regarding the polyolefin resin (A) of the fibers constituting the spunbonded nonwoven fabric layer and the polyolefin resin (B) of the fibers constituting the meltblown nonwoven fabric layer of the present invention, the melt flow rate (sometimes referred to as MFR) indicating the flow characteristics ), using the value measured by ASTM D1238 (Method A).

In addition, according to this standard, for example, the polypropylene system specifies a load: 2.16 kg and a temperature: 230°C; the polyethylene system specifies a load: 2.16 kg and a temperature: 190°C.

First, the MFR of the polyolefin resin (A) constituting the fibers of the spunbonded nonwoven fabric layer is preferably 75 to 850 g/10 minutes. By setting the MFR preferably to 75~850g/10 minutes, more preferably 120~600g/10 minutes, and still more preferably 155~400g/10 minutes, the spunbonded nonwoven fabric layer is spun The thinning behavior is stable, and even if it is stretched at a fast spinning speed in order to improve productivity, it can be spun stably. In addition, by stabilizing the thinning behavior and suppressing yarn sway, it becomes less likely to cause unevenness in flake formation. Furthermore, since it can be stretched stably at a fast spinning speed, the orientation of the fiber can be crystallized, and a fiber with high mechanical strength can be made.

In addition, the MFR of the polyolefin resin (B) constituting the fibers of the melt-blown nonwoven fabric layer is preferably 200 to 2500 g/10 minutes. By setting the MFR to preferably 200 to 2500 g/10 minutes, more preferably to 400 to 2000 g/10 minutes, and still more preferably to 600 to 1500 g/10 minutes, stable spinning becomes easier, and it can be obtained Fibers containing polyolefin resin (B) at the level of several μm.

In addition, regarding the polyolefin resins (A) and (B) used in the present invention, for example, polyethylene resins, polypropylene resins, and the like can be cited.

Examples of polyethylene resins include homopolymers of ethylene, copolymers of ethylene and various α-olefins, and the like.

In addition, examples of polypropylene resins include homopolymers of propylene or copolymers of propylene and various α-olefins. However, from the viewpoint of spinnability and strength characteristics, polypropylene resins are particularly preferably used.

Regarding the polyolefin resin used in the present invention, the ratio of the homopolymer of propylene is preferably 60% by mass or more, more preferably 70% by mass or more, and still more preferably 80% by mass or more. By setting it as the above range, good spinnability can be maintained and the strength can be improved.

The polyolefin resin used in the present invention may be a mixture of two or more types, and a resin composition containing other olefin resins or thermoplastic elastomers may also be used. Of course, two or more types of resins with different MFRs may be blended in any ratio to adjust the MFR of the polyolefin resin (A) and/or the polyolefin resin (B). At this time, the MFR of the resin blended with the main polyolefin resin is preferably 10 to 1000 g/10 minutes, more preferably 20 to 800 g/10 minutes, and still more preferably 30 to 600 g/10 minutes. By doing so, it is possible to prevent partial occurrence of uneven viscosity, uneven fineness, or deterioration of spinnability in the blended polyolefin-based resin.

_{In the laminated nonwoven fabric of the present invention, the MFR ratio (MFR B} /MFR _A ) of the polyolefin resin (A) and the polyolefin resin (B) constituting each of the spunbonded nonwoven fabric and the meltblown nonwoven fabric is preferably 1~ The range of 13 is more preferably the range of 1.5-12. When the MFR ratio (MFR _B /MFR _A ) is in the above range, when the meltblown nonwoven fabric is laminated on the spunbonded nonwoven fabric, bonding can be easily performed, and the effect of improving physical properties such as peel strength can be obtained.

In the polyolefin resin used in the present invention, within the range that does not impair the effects of the present invention, commonly used antioxidants, weathering stabilizers, light stabilizers, antistatic agents, antifogging agents, and antistatic agents can be added as needed. Additives such as antiblocking agents, slip aids, nucleating agents and pigments, or other polymers.

In order to prevent partial viscosity unevenness during the spinning of the fibers described later, the fiber fineness is uniformized, and the fiber diameter is further reduced as described later, and the resin used is also considered to be decomposed to adjust the MFR. However, for example, it is preferable not to add a peroxide, especially a free radical agent such as a dialkyl peroxide. When this method is used, in addition to partial viscosity unevenness and uneven fineness, it becomes difficult to sufficiently reduce the fiber diameter, and there are also problems that spinnability is deteriorated due to uneven viscosity or bubbles caused by decomposition gas. condition.

The melting point of the polyolefin resin used in the present invention is preferably 80 to 200°C, more preferably 100 to 180°C, and still more preferably 120 to 180°C. By setting the melting point to preferably 80°C or higher, more preferably 100°C or higher, and still more preferably 120°C or higher, it becomes easier to obtain practical heat resistance. In addition, by setting the melting point to preferably 200°C or lower, and more preferably 180°C or lower, it becomes easier to cool the yarn discharged from the spinning nozzle, thereby suppressing the fusion of fibers and making it easier to perform stable spinning. .

In order to improve the sliding properties and flexibility of the laminated non-woven fabric of the present invention, the preferred aspect is that the aforementioned polyolefin resin (A) constituting the spunbonded non-woven fabric contains a fatty acid amide compound having a carbon number of 23 to 50 .

By setting the carbon number of the fatty acid amide compound to preferably 23 or more, more preferably 30 or more, it is possible to prevent the fatty acid amide compound from being excessively exposed to the fiber surface, making it excellent in spinnability and processing stability, and maintaining high production sex. On the other hand, by setting the carbon number of the fatty acid amide compound to preferably 50 or less, more preferably 42 or less, the fatty acid amide compound becomes easy to move to the fiber surface, and the sliding properties and flexibility can be imparted to the laminated non-woven fabric .

Examples of the fatty acid amide compound having a carbon number of 23 to 50 used in the present invention include saturated fatty acid monoamide compounds, saturated fatty acid diamide compounds, unsaturated fatty acid monoamide compounds, and unsaturated fatty acid diamide compounds. Amine compounds, etc.

Specifically, examples of fatty acid amide compounds having a carbon number of 23 to 50 include tetracosylamide, hexadecanoic acid amide, octadecanoic acid amide, and tetracosenoic acid amide. , Ticosapentaenoic acid amide, Ticosahexaenoic acid amide, Ethylene dilaurate amide, Methylene dilaurate amide, Ethylene distearate amide, Ethylene distearate Ethyl bishydroxystearate amide, ethylene bisbehenate amide, hexamethylene bisstearate amide, hexamethylene bisbehenate amide, hexamethylene hydroxystearate Fatty acid amide, distearyl adipamide, distearyl sebacate amide, ethylene bis-oleic acid amide, ethylene bis-erucic acid amide, and hexamethylene bis-oleic acid Amide etc., these can also be used in combination of plural numbers.

In the present invention, among these fatty acid amide compounds, it is particularly preferable to use ethylene distearate which is a saturated fatty acid diamide compound. Ethylene distearate can be melt-spinned due to its excellent thermal stability. The polyolefin fiber (A) blended with this ethylene distearate can maintain high productivity. Furthermore, since the sliding properties of the fibers are improved, the fibers can be uniformly dispersed during collection, which also contributes to the improvement of the smoothness of the non-woven fabric. Therefore, in the non-woven fabric, the opening diameter of the non-woven fabric can be reduced, and a laminated non-woven fabric with excellent water resistance and flexibility can be obtained.

In the present invention, the addition amount of the fatty acid amide compound is preferably 0.01 to 5.0% by mass relative to the polyolefin resin (A). By setting the addition amount of the fatty acid amide compound to 0.01 to 5.0% by mass, more preferably to 0.1 to 3.0% by mass, and still more preferably to 0.1 to 1.0% by mass, the spinnability can be maintained and moderate The sliding properties and flexibility.

The addition amount mentioned here refers to the mass percentage of the fatty acid amide compound added to the entire polyolefin fiber (A) constituting the spunbonded nonwoven fabric layer, which constitutes the laminated nonwoven fabric of the present invention. For example, even when the fatty acid amide compound is added only to the sheath component constituting the core-sheath composite fiber described later, the addition ratio with respect to the entire amount of the core-sheath component is calculated.

As a method for measuring the amount of fatty acid amide compound added to the fiber containing polyolefin resin, for example, solvent extraction of the additive from the fiber, and the use of liquid chromatography mass analysis (LS/MS), etc. Methods of quantitative analysis. At this time, the extraction solvent is appropriately selected according to the type of fatty acid amide compound. For example, in the case of ethylenebisstearate, a method using a chloroform-methanol mixture can be cited as an example.

[Fiber]

The fibers containing the polyolefin resin (A) constituting the spunbonded nonwoven fabric layer of the present invention preferably have an average single fiber diameter of 6.5 to 11.9 μm. By setting the average single fiber diameter to preferably 6.5 μm or more, more preferably 7.5 μm or more, and still more preferably 8.4 μm or more, it is possible to prevent a drop in spinnability and form a good-quality nonwoven fabric layer stably. On the other hand, by setting the average single fiber diameter to preferably 11.9 μm or less, more preferably 11.2 μm or less, and still more preferably 10.6 μm or less, the flexibility and uniformity are high, even if the meltblown non-woven fabric layer is reduced It can also be made into a laminated non-woven fabric that can withstand practical water resistance and is excellent in its content ratio.

In addition, in the present invention, the average single fiber diameter (μm) of the fibers including the polyolefin resin (A) constituting the spunbonded nonwoven fabric layer is a value calculated by the following procedure.

(1) The polyolefin resin (A) is melt-spun out, drawn and stretched by an ejector, and then the non-woven fabric layer is collected on the net.

(2) Collect 10 small samples (100×100mm) randomly.

(3) Take a picture of the surface at 500 to 1000 times with a microscope, and measure the width of a total of 100 polyolefin fibers from 10 of each sample.

(4) Calculate the average single fiber diameter (μm) from the average value of the 100 measured values.

On the other hand, the fibers containing the polyolefin resin (B) constituting the melt-blown nonwoven fabric of the present invention preferably have an average single fiber diameter in the range of 0.1 to 8.0 μm, more preferably in the range of 0.4 to 7.0 μm.

In addition, in the present invention, the average single fiber diameter (μm) of the fibers including the polyolefin resin (B) constituting the melt-blown nonwoven fabric layer is a value calculated by the following procedure.

(1) The polyolefin resin (B) is melt-spun and thinned with hot air, and then the non-woven fabric layer is collected on the mesh.

(2) Collect 10 small samples (100×100mm) randomly.

(3) Take a picture of the surface at 500 to 2000 times with a microscope, and measure the width of a total of 100 fibers from 10 fibers in each sample.

(4) Calculate the average single fiber diameter (μm) from the average value of the 100 measured values.

Furthermore, in the present invention, it can also be used as a composite fiber in which the above-mentioned polyolefin resin is combined. As the composite form of the composite fiber, for example, composite forms such as a concentric core sheath type, an eccentric core sheath type, and a sea-island type can be cited. Among them, in view of its excellent spinnability and the fact that the low melting point component is arranged in the sheath component, the fibers can be uniformly bonded to each other by thermal bonding. The preferred aspect is a concentric core-sheath composite form.

[Non-woven fabric layer]

The water resistance of the laminated nonwoven fabric of the present invention can be controlled by the characteristics of the spunbonded nonwoven fabric layer and the meltblown nonwoven fabric layer constituting the laminated nonwoven fabric. The water resistance of the spunbonded non-woven fabric layer can be controlled by the average fiber diameter of the formed fibers and the dispersion of the fibers on the surface of the non-woven fabric layer. The water resistance of the melt-blown non-woven fabric layer can be controlled by the average fiber diameter of the constituent fibers or the mass ratio of the laminated non-woven fabric, and the degree of fusion of the fibers constituting the melt-blown non-woven fabric layer.

[Laminated non-woven fabric]

It is important for the laminated nonwoven fabric of the present invention to laminate a spunbonded nonwoven fabric layer and a meltblown nonwoven fabric. With such a configuration, it is possible to impart water resistance above the level required as a non-woven fabric for house covering materials.

It is important that the MFR of the laminated non-woven fabric of the present invention is 80 to 850 g/10 minutes. By setting the MFR to 80~850g/10 minutes, preferably 120~600g/10 minutes, more preferably 155~400g/10 minutes, the fiber refinement behavior of the spunbond nonwoven fabric layer during spinning Stable, even if it is stretched at a fast spinning speed in order to improve productivity, it can be spun stably. In addition, by stabilizing the thinning behavior of spunbond fibers and suppressing yarn sloshing, it becomes less likely to cause unevenness in flake formation. Furthermore, the ratio of MFR (MFR _B /MFR _A ) of the aforementioned spunbonded nonwoven fabric to meltblown nonwoven fabric becomes smaller. When the meltblown nonwoven fabric is laminated on the spunbonded nonwoven fabric, bonding can be easily performed, and physical properties such as peel strength can be improved. .

The MFR of the laminated non-woven fabric of the present invention adopts the value measured by ASTM D1238 (Method A). In addition, according to this standard, for example, the polypropylene system specifies a load: 2.16 kg and a temperature: 230°C; the polyethylene system specifies a load: 2.16 kg and a temperature: 190°C. In addition, the polyolefin resin constituting the spunbonded nonwoven fabric is different from the polyolefin resin constituting the meltblown nonwoven fabric. When using multiple types of resins, the measurement is performed at the highest temperature among the measurement temperatures of the respective polyolefin resins. .

It is important for the laminated non-woven fabric of the present invention that the water pressure resistance per unit area weight is 15 mmH ₂ O/(g/m ² ) or more. By setting the water pressure resistance per unit area weight to 15mmH ₂ O/(g/m ² ) or more, preferably 17mmH ₂ O/(g/m ² ) or more, it can be made to maintain practical water resistance. , And the laminated non-woven fabric with excellent flexibility, in addition, the low unit area weight of the laminated non-woven fabric is also possible. There is no particular restriction on the upper limit of the water pressure resistance, but the upper limit that can be achieved while maintaining the non-woven fabric structure is at most 30 mmH ₂ O/(g/m ² ).

In addition, the water pressure resistance per unit area weight of the laminated nonwoven fabric of the present invention is based on JIS L1092 (2009) "7.1.1 A method (low water pressure method)", and the value measured by the following procedure is used.

(1) Collect 5 test pieces with a width of 150 mm × 150 mm from the laminated non-woven fabric at equal intervals in the width direction of the laminated non-woven fabric.

(2) Set the test piece in the clip of the measuring device (the part of the test piece that touches the water is 100 cm ² in size).

(3) The leveling device equipped with water raises the water level at a speed of 600mm/min±30mm/min, and measures the water level when water is discharged from three places on the back side of the test piece in mm units.

(4) Perform the above-mentioned measurement on 5 test pieces, and regard the average value as the water pressure resistance.

Furthermore, in the present invention, regarding the smoothness of the surface of the laminated non-woven fabric and the goodness of the skin touch, the aforementioned surface roughness SMD according to the KES method, the average friction coefficient MIU according to the KES method, and the average friction coefficient MIU according to the KES method are used. The average friction coefficient change MMD is evaluated.

It is important for the laminated non-woven fabric of the present invention that the surface roughness SMD of at least one side according to the KES method is 1.0~2.6μm. By setting the surface roughness SMD according to the KES method to 1.0 μm or more, preferably 1.3 μm or more, more preferably 1.6 μm or more, and even more preferably 2.0 μm or more, it is possible to prevent excessive densification of fibers And the hand feel deteriorates, or the softness is impaired.

On the other hand, by setting the surface roughness SMD according to the KES method to 2.6 μm or less, preferably 2.5 μm or less, more preferably 2.4 μm or less, and even more preferably 2.3 μm or less, the surface can be made smooth It is a laminated non-woven fabric with little roughness and excellent skin touch. The surface roughness SMD according to the KES method can be controlled by appropriately adjusting the average single fiber diameter or the MFR of the laminated non-woven fabric.

In addition, in the present invention, the surface roughness SMD according to the KES method adopts the value measured as follows.

(1) Collect three test pieces with a width of 200 mm×200 mm from the laminated non-woven fabric at equal intervals in the width direction of the laminated non-woven fabric.

(2) Set the test piece on the sample table.

0.5mm鋼琴線，接觸長度：5mm)，掃描試驗片之表面，測定表面的凹凸形狀之平均偏差。 (3) Contact head for measuring surface roughness with a load of 10gf (material:

0.5mm piano wire, contact length: 5mm), scan the surface of the test piece, and measure the average deviation of the uneven shape of the surface.

(4) Perform the above measurement in the longitudinal direction (the length direction of the non-woven fabric) and the transverse direction (the width direction of the non-woven fabric) of all test pieces, and average the average deviation of the total 6 points, and give the second decimal place below the decimal point. Round to the nearest nearest whole number, as the surface roughness SMD (μm).

The average friction coefficient MIU of at least one side of the laminated non-woven fabric of the present invention according to the KES method is preferably 0.1 to 0.5. By setting the average friction coefficient MIU to 0.5 or less, more preferably 0.45 or less, and still more preferably 0.4 or less, the sliding properties of the surface of the non-woven fabric can be improved, and a laminated non-woven fabric with better skin touch can be obtained.

On the other hand, by setting the average coefficient of friction MIU to preferably 0.1 or more, more preferably 0.15 or more, and still more preferably 0.2 or more, it is possible to prevent excessive addition of slip aids and deterioration of spinnability, or When the yarn is caught on the net, the yarn slips and the texture becomes poor. According to the average friction coefficient MIU of the KES method, it can be controlled by appropriately adjusting the average single fiber diameter or the MFR of the laminated non-woven fabric, or adding a slip aid to the polyolefin resin.

The variation MMD of the average friction coefficient according to the KES method of at least one side of the laminated non-woven fabric of the present invention is preferably 0.008 or less. By setting the variation MMD of the average friction coefficient to 0.008 or less, more preferably 0.0075 or less, and still more preferably 0.0070 or less, the surface roughness of the laminated non-woven fabric can be further reduced.

The variation of the average friction coefficient MMD according to the KES method can be controlled by appropriately adjusting the average single fiber diameter or the MFR of the laminated non-woven fabric, or adding a slip aid to the polyolefin resin.

In addition, in the present invention, the average friction coefficient MIU and the variation MMD of the average friction coefficient according to the KES method are the values measured as follows.

(1) Collect three test pieces with a width of 200 mm×200 mm from the laminated non-woven fabric at equal intervals in the width direction of the laminated non-woven fabric.

(2) Set the test piece on the sample table.

0.5mm鋼琴線(20條並列)，接觸面積：1cm²)，掃描試驗片之表面，測定平均摩擦係數。 (3) Contact the friction head with a load of 50gf (material:

0.5mm piano wire (20 side by side), contact area: 1cm ² ), scan the surface of the test piece to determine the average friction coefficient.

(4) Perform the above measurement in the longitudinal direction (the length direction of the nonwoven fabric) and the transverse direction (the width direction of the nonwoven fabric) of all the test pieces, and average the average deviation of 6 points in total, and give the fourth decimal place below the decimal point. Round up to the nearest MIU. In addition, the aforementioned changes in the average coefficient of friction for a total of 6 points are further averaged, and the fourth decimal place is rounded to the nearest decimal point to be regarded as the change in the average coefficient of friction MMD.

Furthermore, in the present invention, the softness of the laminated non-woven fabric is evaluated by air permeability and sensory tests.

The air permeability per unit area weight of the laminated non-woven fabric of the present invention is preferably 0.2-10 cc/cm ² ‧ sec/(g/m ² ). By setting the air permeability per unit area weight preferably to 8cc/cm ² ‧sec/(g/m ² ) or less, more preferably 6cc/cm ² ‧sec/(g/m ² ) or less, it is furthermore The best setting is 4cc/cm ² ‧sec/(g/m ² ) or less, which can fully satisfy the air permeability required for house covering applications.

On the other hand, by the air permeation rate per basis weight is preferably set to 0.2cc / cm ² ‧ seconds / (g / m ²⁾ or more, more preferably set to 0.4cc / cm ² ‧ seconds / (g / m ² ) The above, more preferably 0.6cc/cm ² ‧sec/(g/m ² ) or more, can prevent the spunbonded non-woven fabric from being excessively densified and impairing softness. The air permeability can be adjusted by weight per unit area, single fiber size, weight per unit area of the meltblown layer, and thermal compression bonding conditions (crimping rate, temperature, and linear pressure).

In addition, in the present invention, the air permeability per unit area weight of the laminated non-woven fabric is based on the "6.8.1 Frazier type method" of JIS L1913 (2010), which is measured by the following procedure value.

(1) Cut out a test piece of 80cm×100cm from the laminated non-woven fabric.

(2) Measure any 20 points in the test piece under the pressure of the barometer at 125 Pa.

(3) The average value of the above 20 points is calculated by rounding the second digit below the decimal point.

(4) Divide the calculated air permeability (cc/cm ² ‧sec) by the weight per unit area (g/m ² ).

For the laminated nonwoven fabric of the present invention, relative to the quality of the laminated nonwoven fabric, the content of the meltblown nonwoven fabric layer is preferably 1% by mass to 15% by mass, and more preferably 2% by mass to 10% by mass. By setting the content of the melt-blown nonwoven fabric layer to preferably 1% by mass or more, more preferably 2% by mass or more, it is possible to impart water resistance that is practical and durable. In addition, by setting the content of the melt-blown non-woven fabric layer to preferably 5 mass% or less, more preferably 10 mass% or less, the hardness peculiar to the melt-blown non-woven fabric can be reduced.

In addition, by setting the content of the spunbonded nonwoven fabric layer in the laminated nonwoven fabric to be more than 85% by mass and less than 99% by mass, a laminated nonwoven fabric with excellent flexibility and processability can be obtained.

In addition, in the present invention, the content ratio of the melt-blown non-woven fabric layer is a value measured by the following procedure.

(1) Collect three test pieces with a width of 100mm×100mm at equal intervals in the width direction of the laminated nonwoven fabric.

(2) Only the non-crimped parts of laminated non-woven fabrics are collected.

(3) Measure the quality of the collected test piece and the meltblown nonwoven fabric collected from the test piece.

(4) Calculate the content ratio of the melt-blown non-woven fabric in the laminated non-woven fabric.

The weight per unit area of the laminated non-woven fabric of the present invention is preferably 10-100 g/m ² . By setting the weight per unit area to preferably 10 g/m ² or more, more preferably 13 g/m ² or more, and still more preferably 15 g/m ² or more, a laminated non-woven fabric with practical mechanical strength can be obtained.

On the other hand, by setting the weight per unit area to 100 g/m ² or less, more preferably 50 g/m ² or less, and still more preferably 30 g/m ² or less, when used as a housing cladding material, it becomes During construction, it is suitable for the weight of the operator during hand-held work, and can be made into a laminated non-woven fabric with excellent operability during construction. Moreover, when used for other purposes, it can also be made into a laminated non-woven fabric with excellent handleability.

In addition, in the present invention, the weight per unit area of the laminated non-woven fabric is based on "6.2 Mass per Unit Area" of JIS L1913 (2010), and the value measured by the following procedure is used.

(1) Collect 3 test pieces of 20cm×25cm per 1m of the width of the sample.

(2) Weigh the respective mass (g) in the standard state.

(3) The average value is expressed in terms ^{of mass per 1 m 2} (g/m ^{2 ).}

The thickness of the laminated non-woven fabric of the present invention is preferably 0.05 to 1.5 mm. By setting the thickness to preferably 0.05~1.5mm, more preferably 0.08~1.0mm, and still more preferably 0.10~0.8mm, it has flexibility and moderate cushioning properties. When used as a housing cladding material, It is suitable for the weight when the operator is holding it during construction. The rigidity of the non-woven fabric is not too strong, and it can be made into a laminated non-woven fabric with excellent operability during construction.

In addition, in the present invention, the thickness (mm) of the laminated non-woven fabric is based on "5.1" of JIS L1906 (2000), and the value measured by the following procedure is used.

(1) Using a pressure head with a diameter of 10 mm, under a load of 10 kPa, the thickness of the non-woven fabric at ten points in the width direction of the nonwoven fabric at equal intervals in the width direction was measured in units of 0.01 mm.

(2) Round the third decimal place below the average of the above ten points.

The apparent density of the laminated non-woven fabric of the present invention is preferably 0.05 to 0.3 g/cm ³ . By setting the apparent density to 0.3 g/cm ³ or less, more preferably 0.25 g/cm ³ or less, and still more preferably 0.20 g/cm ³ or less, it is possible to prevent fibers from being packed tightly and damaging the laminated non-woven fabric The softness.

On the other hand, by setting the apparent density to 0.05 g/cm ³ or more, more preferably 0.08 g/cm ³ or more, and still more preferably 0.10 g/cm ³ or more, it is possible to suppress fluffing and delamination The occurrence of this is to create a laminated non-woven fabric with strength, flexibility and handling that can withstand practical use.

In addition, in the present invention, the apparent density (g/cm ³ ) is calculated from the above-mentioned weight per unit area and thickness before rounding, calculated based on the following formula, and rounded to the third decimal place.

‧Apparent density (g/cm ³ )=[weight per unit area (g/m ² )]/[thickness (mm)]×10 ^-3 .

The stress at 5% of the weight per unit area of the laminated nonwoven fabric of the present invention (hereinafter, sometimes described as 5% modulus of the weight per unit area) is preferably 0.06~0.33 (N/25mm)/(g/m ² ), more preferably 0.13~0.30 (N/25mm)/(g/m ² ), still more preferably 0.20~0.27 (N/25mm)/(g/m ² ). By setting it in the above range, a spunbonded nonwoven fabric can be made that maintains practical strength, is soft and has an excellent touch.

In addition, in the present invention, the stress at 5% of the weight per unit area of the laminated nonwoven fabric is based on "6.3 Tensile Strength and Elongation (ISO Method)" of JIS L1913 (2010), using the following procedure The measured value.

(1) For each of the longitudinal direction (the length direction of the non-woven fabric) and the transverse direction (the width direction of the non-woven fabric) of the non-woven fabric, three test pieces of 25mm×300mm were collected per 1m in width.

(2) The test piece is set in the tensile tester at a distance of 200 mm between the clamps.

(3) A tensile test was performed at a tensile speed of 100 mm/min, and the stress (5% modulus) at 5% elongation was measured.

(4) Calculate the average value of the 5% modulus in the longitudinal and transverse directions measured from each test piece, calculate the 5% modulus per unit area weight based on the following formula, and round to the third decimal place.

‧5% modulus of weight per unit area ((N/25mm)/(g/m ² ))=[average value of 5% modulus (N/25mm)]/weight per unit area (g/m ² ).

[Manufacturing method of laminated non-woven fabric]

Next, the preferred aspect of the method of manufacturing the laminated non-woven fabric of the present invention will be described in detail.

The laminated non-woven fabric of the present invention includes non-woven fabrics manufactured by the spunbond (S) method and the meltblown (M) method. The manufacturing method of the laminated nonwoven fabric of the present invention can be carried out according to any method as long as it is a method capable of laminating a spunbonded nonwoven fabric layer and a meltblown nonwoven fabric layer. For example, it can be used: the fiber formed by the melt-blown method is directly deposited on the non-woven fabric layer obtained by the spun-bonded method, and after the melt-blown non-woven fabric layer is formed, the spun-bonded non-woven fabric layer and the melt-blown non-woven fabric layer are welded; The method of laminating the spunbonded nonwoven fabric layer and the meltblown nonwoven fabric layer to fuse the two nonwoven fabric layers by heating and pressing; using an adhesive such as a hot melt adhesive or a solvent-based adhesive, the spunbonded nonwoven fabric layer is melted The method of spraying non-woven fabric layer and so on. From the viewpoint of productivity, a preferred aspect is a method of directly forming a meltblown nonwoven fabric layer on the spunbonded nonwoven fabric layer.

Moreover, according to the purpose, the spunbonded nonwoven fabric layer (S) and the meltblown nonwoven fabric layer (M) can be laminated into a structure of SM, SMS, SMMS, SSMMS, and SMSMS.

The spunbonded non-woven fabric layer is first spun out the molten thermoplastic resin (polyolefin resin) from the spinning nozzle as a long fiber, then it is drawn by an ejector with compressed air, and then it is caught on the moving net. Collect fiber and non-woven fabric layered.

The shape of the spinning nozzle or ejector is not particularly limited. For example, various shapes such as a circle or a rectangle can be used. Among them, in view of the relatively small amount of compressed air used, the excellent energy cost, the resistance to welding and friction between the yarns, and the easy opening of the yarns, it is better to use a combination of a rectangular spinning nozzle and a rectangular jet.

In the present invention, the polyolefin resin is melted in an extruder, metered, supplied to a spinning nozzle, and spun out as a long fiber. The spinning temperature during melting and spinning the polyolefin resin is preferably 200 to 270°C, more preferably 210 to 260°C, and still more preferably 220 to 250°C. By setting the spinning temperature within the above-mentioned range, a stable molten state can be made, and excellent spinning stability can be obtained.

The spun yarns of long fibers are then cooled. As a method of cooling the spun yarn, for example, a method of forcibly blowing cold air onto the yarn, a method of natural cooling by the temperature of the gas surrounding the yarn, and adjustment of the spinning nozzle and jet The distance between devices, etc., or a combination of these methods can be used. In addition, the cooling conditions can be appropriately adjusted in consideration of the discharge amount per single hole of the spinning nozzle, the spinning temperature, and the temperature of the gas environment.

Then, the cooled and solidified yarn is drawn and extended by compressed air ejected from the ejector. The spinning speed is preferably 3,000 to 6,500 m/min, more preferably 3,500 to 6,500 m/min, and still more preferably 4,000 to 6,500 m/min. By setting the spinning speed to 3,000-6,500m/min, it becomes highly productive, and the orientation crystallization system of the fibers progresses, and high-strength long fibers can be obtained. Generally, if the spinning speed is increased, the spinnability will deteriorate and the yarn cannot be produced stably. However, as described above, by using a polyolefin resin having a specific range of MFR, the desired polyolefin fiber can be spun stably .

Subsequently, the obtained long fibers are collected on the moving web without being woven into layers. In the present invention, it is also preferable that the non-woven fabric layer is temporarily attached to the web by abutting the thermal flat roller from one side thereof. By doing so, it is possible to prevent the surface layer of the non-woven fabric layer from being rolled up or fluttering during transport on the web to deteriorate the texture, and to improve the transportability from the replenishment of the yarn to the thermocompression bonding.

Then, the melt-blown non-woven fabric can adopt a conventional method. First, the polyolefin resin is melted in the extruder and supplied to the spinning nozzle. After blowing hot air to the yarn extruded from the spinning nozzle to make it thin, a non-woven fabric layer is formed on the collecting net. . In the melt-blown method, no complicated steps are required, and fine fibers of several μm can be easily obtained, and high water resistance can be easily achieved.

Secondly, the spunbonded nonwoven fabric layer and the meltblown nonwoven fabric layer obtained by lamination are thermally bonded to obtain the intended laminated nonwoven fabric.

The method of thermally bonding the non-woven fabric layer is not particularly limited. For example, a pair of upper and lower hot embossing rolls with engravings (concavo-convex portions) on the surface of the rolls, including a roll with a flat (smooth) surface Various rolls such as a hot embossing roll that is a combination of a roll and another roll with engraving (concavo-convex) on the surface of the roll, and a hot calender roll that includes a combination of a pair of upper and lower flat (smooth) rolls for thermal bonding The method, or the method of ultrasonic bonding by the ultrasonic vibration of the horn to make it thermally welded.

Among them, from the standpoint of excellent productivity, the ability to impart strength with a part of the thermally bonded portion, and the hand and skin feel of non-woven fabric in the non-bonded portion, the preferred aspect is to use a pair of upper and lower rollers on the surface of the roller. A hot embossing roll with engraving (concavo-convex) or a combination of a roll with a flat (smooth) roll surface and another roll with engraving (concavo-convex) on the surface of the roll.

As the surface material of the hot embossing roll, in order to obtain a sufficient thermal compression bonding effect and prevent the engraving (concave and convex portion) of one embossing roll from being transferred to the surface of the other roll, it is preferable to use a metal roll Paired with metal rollers.

The area ratio of embossing by using such a hot embossing roll is preferably 5-30%. By setting the bonding area ratio to preferably 5% or more, more preferably 8% or more, and still more preferably 10% or more, as a laminated nonwoven fabric, it is possible to obtain practical strength. On the other hand, by setting the bonding area ratio to preferably 30% or less, more preferably 25% or less, and still more preferably 20% or less, moderate flexibility particularly suitable for use in building materials can be obtained. Even when ultrasonic bonding is used, the bonding area ratio is preferably in the same range.

The so-called bonding area ratio here refers to the ratio of the bonding portion to the entire laminated nonwoven fabric. Specifically, when thermal bonding is performed by a pair of uneven rollers, it means that the convex portion of the upper roller overlaps the convex portion of the lower roller and abuts against the non-woven fabric layer (adhesive portion) in the entire laminated non-woven fabric The percentage. In addition, when thermal bonding is performed by a roller having unevenness and a flat roller, it refers to the proportion of the portion (adhesion portion) where the protrusion of the roller having unevenness abuts the non-woven fabric layer in the entire laminated non-woven fabric. In addition, when ultrasonic bonding is performed, it refers to the proportion of the portion (bonded portion) thermally welded by ultrasonic processing in the entire laminated non-woven fabric.

The shape of the bonding part caused by hot embossing rolls or ultrasonic bonding is not particularly limited. For example, a circle, an ellipse, a square, a rectangle, a parallelogram, a rhombus, a regular hexagon, and a regular octagon can be used. Moreover, it is preferable that the adhesive part exists uniformly at predetermined intervals in the longitudinal direction (conveying direction) and the width direction of a laminated nonwoven fabric. By doing this, the strength deviation of the laminated non-woven fabric can be reduced.

The surface temperature of the hot embossing roll during thermal bonding is preferably set at -50 to -15°C relative to the melting point of the polyolefin resin used. By setting the surface temperature of the heat roller to the melting point of the polyolefin resin preferably at -50°C or higher, and more preferably at -45°C or higher, it can be properly thermally bonded to obtain practical strength The laminated non-woven fabric. In addition, the surface temperature of the hot embossing roll is preferably set to -15°C or less, more preferably -20°C or less, with respect to the melting point of the polyolefin resin, so as to suppress excessive thermal bonding and serve as a build-up layer Non-woven fabric can obtain moderate softness and processability especially suitable for use in construction materials.

The linear pressure of the hot embossing roll during thermal bonding is preferably 50~500N/cm. By setting the linear pressure of the roller to preferably 50N/cm or more, more preferably 100N/cm or more, and still more preferably 150N/cm or more, it can be properly thermally bonded and a laminated layer with practical strength can be obtained Non-woven.

On the other hand, by setting the linear pressure of the hot embossing roll to preferably 500 N/cm or less, more preferably 400 N/cm or less, and still more preferably 300 N/cm or less, it is particularly suitable as a laminated non-woven fabric. Appropriate softness‧workability for use in building materials.

Furthermore, in the present invention, for the purpose of adjusting the thickness of the laminated non-woven fabric, before and/or after the thermal bonding by the above-mentioned thermal embossing roll, it can be performed by a thermal calender roll including a pair of upper and lower flat rolls. Pre-heat crimping. The so-called upper and lower pair of flat rolls are metal rolls or elastic rolls that have no unevenness on the surface of the roll. A metal roll and a metal roll can be paired, or a metal roll and an elastic roll can be used as a pair.

In addition, the elastic roller referred to here includes a roller made of a material that is more elastic than a metal roller. Examples of elastic rollers include so-called paper rollers such as paper, cotton, and polyaramide paper, or include urethane resins, epoxy resins, silicone resins, and polyester resins. And hard rubber, and resin rolls of mixtures of these, etc.

[Example]

Next, the laminated nonwoven fabric of this invention is demonstrated concretely based on an Example. In the measurement of each physical property, the measurement was performed based on the aforementioned method if there is no special description.

(1) MFR of polyolefin resin (g/10 minutes):

The MFR of the polyolefin resin (A) and the polyolefin resin (B) is measured under the conditions of a load of 2.16 kg and a temperature of 230°C.

(2) MFR of laminated non-woven fabric (g/10 minutes):

The MFR of the laminated non-woven fabric is measured under the conditions of a load of 2.16 kg and a temperature of 230°C.

(3) Spinning speed (m/min):

From the above average single fiber diameter and the solid density of the polyolefin resin (A) or polyolefin resin (B) used, the mass per 10,000 m in length is regarded as the average single fiber fineness (dtex), and the decimal point is The second digit below is rounded up. From the average single fiber fineness and the ejection amount of resin ejected from a single hole of the spinning nozzle set under each condition (hereinafter referred to as single hole ejection amount) (g/min), the spinning speed was calculated based on the following formula.

‧Spinning speed (m/min)=(10000×[single hole discharge (g/min)])/[average single fiber fineness (dtex)].

(4) Water pressure resistance of laminated non-woven fabric (mmH ₂ O):

The water pressure tester "HydroTester" (FX-3000-IV type) manufactured by Swiss TEXTEST is used.

(5) Air permeability per unit area weight of laminated non-woven fabric ((cc/cm ² ‧sec)/(g/m ² )):

Based on the aforementioned method, the air permeability is measured. In addition, take the calculated air permeability (cc/cm ² ‧ seconds) from the weight per unit area (g/m ² ) calculated based on the above-mentioned method, and round the second digit below the decimal point by the following formula , Calculate the air permeability per unit area weight.

‧Air permeability per unit area weight = air permeability (cc/cm ² ‧sec)/unit area weight (g/m ² ).

(6) Surface roughness SMD (μm) of laminated non-woven fabric according to KES method:

In the measurement, an automated surface testing machine "KES-FB4-AUTO-A" manufactured by KATO TECH was used. The surface roughness SMD is measured on both sides of the laminated non-woven fabric, and Table 1 lists the smaller value among these.

(7) The average friction coefficient MIU of laminated non-woven fabric according to the KES method, the variation of the average friction coefficient MMD of laminated non-woven fabric according to the KES method:

In the measurement, an automated surface testing machine "KES-FB4-AUTO-A" manufactured by KATO TECH was used. The average friction coefficient MIU was measured on both sides of the laminated non-woven fabric, and Table 1 lists the smaller value among these.

(8) The softness of non-woven fabric (processability):

As a sensory evaluation of the touch of the nonwoven fabric, the softness was scored based on the following criteria. This system was conducted by 10 people, and the average was evaluated as the touch of the non-woven fabric. The higher the number of points, the better the flexibility and the better the workability in various processing, and 4.0 points or more are regarded as acceptable.

<Softness (Processability)>

5 points: soft (good workability)

4 o'clock: midway between 5 o'clock and 3 o'clock

3 points: normal

2 o'clock: midway between 3 o'clock and 1 o'clock

1 point: hard (poor workability).

[Example 1] (Spunbond non-woven fabric layer (lower layer))

為0.30mm、孔深度為2mm的矩形紡嘴，在紡絲溫度為235℃、單孔吐出量為0.32g/分鐘之條件下紡出。將所紡出的紗線冷卻固化後，將其在矩形噴射器中，藉由將噴射器壓力設為0.35MPa的壓縮空氣，進行牽引、延伸，捕集在移動的網狀物上。藉此，形成由聚丙烯長纖維所構成之單位面積重量為8.2g/m²之紡黏不織布層。構成所形成的紡黏不織布層之纖維的特性，係平均單纖維直徑為10.1μm，由此所換算的紡絲速度為4,400m/分鐘。關於紡絲性，在1小時的紡絲中未看見斷線而為良好。 A polypropylene resin composed of a homopolymer with an MFR of 200g/10 minutes and a melting point of 163°C is melted in an extruder,

A rectangular spinning nozzle with a diameter of 0.30 mm and a hole depth of 2 mm was spun under the conditions of a spinning temperature of 235°C and a single hole discharge rate of 0.32 g/min. After the spun yarn is cooled and solidified, it is drawn and stretched in a rectangular ejector with compressed air with the ejector pressure set to 0.35 MPa, and then collected on the moving net. Thereby, a spunbonded non-woven fabric layer composed of polypropylene long fibers with a basis weight of 8.2 g/m ^{2 was formed.} The characteristics of the fibers constituting the spunbonded non-woven fabric layer are that the average single fiber diameter is 10.1 μm, and the spinning speed converted from this is 4,400 m/min. Regarding spinnability, no yarn breakage was seen during spinning for 1 hour, and it was good.

(Meltblown non-woven fabric layer)

為0.25mm的紡嘴，在紡絲溫度為260℃、單孔吐出量為0.10g/分鐘下紡出。然後，於空氣溫度為290℃、空氣壓力為0.10MPa之條件下，將空氣噴射至紗線，捕集在前述之紡黏不織布層上，形成熔噴不織布層。此時，於相同條件下另外採集在捕集網狀物上的熔噴不織布層之單位面積重量為1.6g/m²，平均纖維直徑為1.5μm。 Next, a polypropylene resin composed of a homopolymer with an MFR of 1100 g/min was melted in an extruder,

A spinning nozzle of 0.25 mm is spun at a spinning temperature of 260°C and a single hole discharge rate of 0.10 g/min. Then, under the conditions of an air temperature of 290°C and an air pressure of 0.10 MPa, air was sprayed onto the yarns and trapped on the aforementioned spunbonded non-woven fabric layer to form a melt-blown non-woven fabric layer. At this time, the weight per unit area of the melt-blown non-woven fabric layer separately collected on the capturing net under the same conditions was 1.6 g/m ² , and the average fiber diameter was 1.5 μm.

(Spunbond non-woven fabric layer (upper layer))

Furthermore, on the meltblown nonwoven fabric layer, under the same conditions as the spunbonded nonwoven fabric layer forming the lower layer, polypropylene long fibers are supplemented to form a spunbonded nonwoven fabric layer. In this way, a spunbond-meltblown-spunbond laminated fiber web (web) with a total weight per unit area of 18 g/m ^{2 was obtained.}

(Laminated non-woven fabric)

Next, use the embossing roll made of metal and engraved with a water drop pattern with a bonding area ratio of 16% as the upper roll, and the upper and lower pair of metal flat rolls are used as the lower roll. The hot embossing roll was thermally bonded under the conditions of a linear pressure of 300 N/cm and a thermal bonding temperature of 130°C to obtain a laminated non-woven fabric ^{with a unit area weight of 18 g/m 2.} For the obtained laminated non-woven fabric, the thickness, apparent density, water pressure resistance, air permeability per unit area weight, surface roughness SMD, average friction coefficient MIU and average friction coefficient variation MMD were measured to further evaluate the softness of the laminated non-woven fabric. The results are shown in Table 1.

[Example 2] (Spunbond non-woven fabric layer (lower layer)‧(upper layer))

The spunbonded non-woven fabric layer composed of polypropylene long fibers was formed by the same method as in Example 1, except that the discharge rate of a single hole was set to 0.21 g/min and the pressure of the ejector was set to 0.50 MPa. The characteristics of the long fibers constituting the spunbonded nonwoven fabric layer are that the average single fiber diameter is 7.2μm, and the spinning speed converted from this is 5,700m/min. Regarding spinnability, no yarn breakage was seen during spinning for 1 hour, and it was good.

(Meltblown non-woven fabric layer)

The melt-blown nonwoven fabric layer was formed in the same manner as in Example 1 except that the air pressure was 0.20 MPa. The characteristics of the fibers constituting the resulting melt-blown non-woven fabric layer are that the average fiber diameter is 1.0 μm.

(Laminated non-woven fabric)

In the same manner as in Example 1, a laminated nonwoven fabric was obtained. For the obtained laminated non-woven fabric, the thickness, apparent density, water pressure resistance, air permeability per unit area weight, surface roughness SMD, average friction coefficient MIU and average friction coefficient variation MMD were measured to further evaluate the softness of the laminated non-woven fabric. The results are shown in Table 1.

[Example 3] (Spunbond non-woven fabric layer (lower layer)‧(upper layer))

Except that the ejector pressure was set to 0.50 MPa, a spunbonded non-woven fabric layer composed of polypropylene long fibers was formed by the same method as in Example 1. The characteristics of the long fibers constituting the spunbonded non-woven fabric layer are that the average single fiber diameter is 8.9 μm, and the spinning speed converted from this is 5,600 m/min. Regarding spinnability, no yarn breakage was seen during spinning for 1 hour, and it was good.

(Meltblown non-woven fabric layer)

In the same manner as in Example 2, a melt-blown non-woven fabric layer was formed.

(Laminated non-woven fabric)

In the same manner as in Example 1, a laminated non-woven fabric was obtained. For the obtained laminated non-woven fabric, the thickness, apparent density, water pressure resistance, air permeability per unit area weight, surface roughness SMD, average friction coefficient MIU and average friction coefficient variation MMD were measured to further evaluate the softness of the laminated non-woven fabric. The results are shown in Table 1.

[Example 4] (Spunbond non-woven fabric layer (lower layer)‧(upper layer))

In the same manner as in Example 1, a spunbonded non-woven fabric layer was obtained.

(Meltblown non-woven fabric layer)

In the same manner as in Example 2, a melt-blown non-woven fabric layer fiber web was obtained.

(Laminated non-woven fabric)

In the same manner as in Example 1, a laminated non-woven fabric was obtained. For the obtained laminated non-woven fabric, the thickness, apparent density, water pressure resistance, air permeability per unit area weight, surface roughness SMD, average friction coefficient MIU and average friction coefficient variation MMD were measured to further evaluate the softness of the laminated non-woven fabric. The results are shown in Table 1.

[Example 5] (Spunbond non-woven fabric layer (lower layer)‧(upper layer))

Except that the weight per unit area was set to 8.5 g/m ² , the spunbonded non-woven fabric layer was obtained in the same manner as in Example 2.

(Meltblown non-woven fabric layer)

Except that the weight per unit area was 1.0 g/m ² , the same method as in Example 2 was used to obtain a melt-blown non-woven fabric layer.

(Laminated non-woven fabric)

In the same manner as in Example 1, a laminated non-woven fabric was obtained. For the obtained laminated non-woven fabric, the thickness, apparent density, water pressure resistance, air permeability per unit area weight, surface roughness SMD, average friction coefficient MIU and average friction coefficient variation MMD were measured to further evaluate the softness of the laminated non-woven fabric. The results are shown in Table 1.

[Example 6] (Spunbond non-woven fabric layer (lower layer)‧(upper layer))

Except that the weight per unit area was set to 8.5 g/m ² , the spunbonded non-woven fabric layer was obtained in the same manner as in Example 3.

(Meltblown non-woven fabric layer)

In the same manner as in Example 5, a melt-blown non-woven fabric layer was obtained.

(Laminated non-woven fabric)

In the same manner as in Example 1, a laminated non-woven fabric was obtained. For the obtained laminated non-woven fabric, the thickness, apparent density, water pressure resistance, air permeability per unit area weight, surface roughness SMD, average friction coefficient MIU and average friction coefficient variation MMD were measured to further evaluate the softness of the laminated non-woven fabric. The results are shown in Table 1.

[Example 7] (Spunbond non-woven fabric layer (lower layer)‧(upper layer))

Except for adding 1.0% by mass of ethylenebisstearate as the fatty acid amide compound to the polypropylene resin composed of the homopolymer, the same method as in Example 1 was used to obtain a spunbonded nonwoven fabric layer.

(Meltblown non-woven fabric layer)

In the same manner as in Example 1, a melt-blown non-woven fabric layer was obtained.

(Laminated non-woven fabric)

In the same manner as in Example 1, a laminated non-woven fabric was obtained. For the obtained laminated non-woven fabric, the thickness, apparent density, water pressure resistance, air permeability per unit area weight, surface roughness SMD, average friction coefficient MIU and average friction coefficient variation MMD were measured to further evaluate the softness of the laminated non-woven fabric. The results are shown in Table 1.

[Example 8] (Spunbond non-woven fabric layer (lower layer)‧(upper layer))

Except that the weight per unit area was 13.6 g/m ² , the same method as in Example 1 was used to obtain a spunbonded non-woven fabric layer.

(Meltblown non-woven fabric layer)

Except that the weight per unit area was 2.8 g/m ² , the same method as in Example 1 was used to obtain a melt-blown non-woven fabric layer.

(Laminated non-woven fabric)

In the same manner as in Example 1, a laminated non-woven fabric was obtained. For the obtained laminated non-woven fabric, the thickness, apparent density, water pressure resistance, air permeability per unit area weight, surface roughness SMD, average friction coefficient MIU and average friction coefficient variation MMD were measured to further evaluate the softness of the laminated non-woven fabric. The results are shown in Table 1.

[Comparative Example 1] (Spunbond non-woven fabric layer (lower layer)‧(upper layer))

A spunbonded nonwoven fabric layer was obtained in the same manner as in Example 1, except that a homopolypropylene resin with an MFR of 60 g/10 minutes and a melting point of 163°C was used, and the ejector pressure was set to 0.20 MPa. The characteristics of the long fibers constituting the spunbonded nonwoven fabric layer are that the average single fiber diameter is 11.8 μm, and the spinning speed converted from this is 3,200 m/min. Regarding spinnability, no yarn breakage was seen during spinning for 1 hour, and it was good. In addition, when the ejector pressure was set to 0.35 MPa under the same conditions, thread breakage occurred frequently and spinning was impossible.

(Meltblown non-woven fabric layer)

In the same manner as in Example 2, a melt-blown non-woven fabric layer was obtained.

(Laminated non-woven fabric)

In the same manner as in Example 1, a laminated non-woven fabric was obtained. For the obtained laminated non-woven fabric, the thickness, apparent density, water pressure resistance, air permeability per unit area weight, surface roughness SMD, average friction coefficient MIU and average friction coefficient variation MMD were measured to further evaluate the softness of the laminated non-woven fabric. The results are shown in Table 1.

[Comparative Example 2] (Spunbond non-woven fabric layer (lower layer)‧(upper layer))

In the same manner as in Comparative Example 1, a spunbonded non-woven fabric layer was obtained.

(Meltblown non-woven fabric layer)

Except for setting the weight per unit area to 2.0 g/m ² , the melt-blown non-woven fabric layer was obtained in the same manner as in Example 2.

(Laminated non-woven fabric)

In the same manner as in Example 1, a laminated non-woven fabric was obtained. For the obtained laminated non-woven fabric, the thickness, apparent density, water pressure resistance, air permeability per unit area weight, surface roughness SMD, average friction coefficient MIU and average friction coefficient variation MMD were measured to further evaluate the softness of the laminated non-woven fabric. The results are shown in Table 1.

[Comparative Example 3] (Spunbond non-woven fabric layer (lower layer)‧(upper layer))

The spunbond was obtained in the same manner as in Example 1, except that a homopolypropylene resin with an MFR of 35 g/10 min and a melting point of 163°C was used, the single hole discharge rate was set to 0.5 g/min, and the ejector pressure was set to 0.20 MPa. Non-woven layer. The characteristics of the long fibers constituting the resulting spunbonded nonwoven fabric layer are that the average single fiber diameter is 14.5 μm, and the spinning speed converted from this is 3,300 m/min. In addition, when the ejector pressure was set to 0.35 MPa under the same conditions, thread breakage occurred frequently and spinning was impossible.

(Meltblown non-woven fabric layer)

In the same manner as in Example 2, a melt-blown non-woven fabric layer was obtained.

(Laminated non-woven fabric)

In the same manner as in Example 1, a laminated non-woven fabric was obtained. For the obtained laminated non-woven fabric, the thickness, apparent density, water pressure resistance, air permeability per unit area weight, surface roughness SMD, average friction coefficient MIU and average friction coefficient variation MMD were measured to further evaluate the softness of the laminated non-woven fabric. The results are shown in Table 1.

In Examples 1-8, the surface roughness SMD according to the KES method is 1.0-2.6 μm, and the water pressure resistance per unit area weight is 15 mmH ₂ O/(g/m ² ) or more, which has excellent water resistance characteristics. Especially in Examples 1 to 7, since the content of the fibers constituting the meltblown nonwoven fabric layer is 1-10% by mass relative to the quality of the laminated nonwoven fabric, the nonwoven fabric is also excellent in softness (processability). Furthermore, the laminated non-woven fabric of Example 7 in which ethylene distearate was added to the fibers constituting the spunbonded non-woven fabric layer has reduced average friction coefficient, increased flexibility and excellent processability, and is particularly suitable for housing Non-woven fabric for covering material.

On the other hand, the laminated non-woven fabrics of Comparative Examples 1 to 3 have a surface roughness SMD of 2.7 μm or more, poor water resistance, and low flexibility.

Although the present invention has been described in detail using a specific aspect, various changes and modifications are possible without departing from the intent and scope of the present invention, as it is clear to those skilled in the art. In addition, this application is based on the Japanese invention patent application filed on February 28, 2018 (Japanese Patent Application 2018-034868) and the Japanese invention patent application filed on July 27, 2018 (Japanese Patent Application 2018-141050). , The whole is quoted by reference.

[Industrial availability]

The laminated non-woven fabric of the present invention has high productivity, uniform texture, smooth surface, excellent hand and skin touch, and high water resistance, so it can be suitably used as a moisture-permeable waterproof sheet and as a construction material.

In addition, the use of the laminated non-woven fabric of the present invention is not limited to the above. For example, it can be used for industrial materials such as filters, filter substrates, wire press coils, wallpaper, roof lining materials, sound insulation materials, heat insulation materials, and sound absorbing materials. Such as construction materials, covering materials, bag materials, watch boards, printing substrates and other living materials, grass-proof sheets, drainage materials, foundation reinforcement materials, sound insulation materials, sound-absorbing materials and other civil engineering materials, agricultural covering materials, shading sheets Such as agricultural materials, ceiling materials and spare tire cover materials and other vehicle materials.

Claims (8)

A laminated nonwoven fabric comprising a spunbonded nonwoven fabric layer composed of fibers containing polyolefin resin (A) and a meltblown nonwoven fabric layer composed of fibers containing polyolefin resin (B). Non-woven fabric, in which the polyolefin resin (A) is a single product or a mixture of two or more types, and when the polyolefin resin (A) is a mixture of two or more types, the MFR of the blended resin is 20~800g/ In 10 minutes, the melt flow rate of the laminated non-woven fabric is 80~850g/10 minutes, the surface roughness SMD according to the KES method of at least one side is 1.0~2.6μm, and the water pressure resistance per unit area weight is 15mmH ₂ O/ (g/m ² ) or more. Such as the laminated nonwoven fabric of claim 1, wherein the average single fiber diameter of the fibers comprising the polyolefin resin (A) constituting the spunbonded nonwoven fabric layer is 6.5 to 11.9 μm. Such as the laminated non-woven fabric of claim 1 or 2, wherein the content of the melt-blown non-woven fabric layer relative to the mass of the laminated non-woven fabric is 1% by mass to 15% by mass. For the laminated non-woven fabric of claim 1 or 2, the average friction coefficient MIU of at least one side according to the KES method is 0.1~0.5. For the laminated non-woven fabric of claim 1 or 2, the variation MMD of the average friction coefficient of at least one side according to the KES method is less than 0.008. The laminated nonwoven fabric of Claim 1 or 2 is obtained by making the polyolefin resin (A) contain a fatty acid amide compound having a carbon number of 23 or more and 50 or less. Such as the laminated non-woven fabric of claim 6, wherein the addition amount of the fatty acid amide compound is 0.01~5.0% by mass. Such as the laminated non-woven fabric of claim 6, wherein the fatty acid amide compound is ethylene distearate.