TWI717037B - Non-woven fabric that inhibits hot melt penetration - Google Patents

Abstract

The present invention provides a non-woven fabric that is suitable for high-flexibility surface sheets, backsheets or side folds of absorbent articles used in sanitary materials, and has less hot melt penetration and can maintain relatively High process stability and productivity. The long-fiber non-woven fabric of the present invention is a long-fiber non-woven fabric containing a thermoplastic resin, characterized in that the contact area ratio of at least one surface of the non-woven fabric is 30% to 60%, and the ratio of the minimum unevenness to the thickness of the non-woven fabric is 15 % Above 50%.

Description

Non-woven fabric that inhibits hot melt penetration

The present invention relates to a long-fiber non-woven fabric that is suitable for high-flexibility surface sheets, back sheets or side wrinkles of absorbent articles used in hygienic materials, and contains anti-hot melt coating The transparent thermoplastic resin.

In recent years, the popularity of disposable diapers has been amazing, and its production has also increased dramatically. As a disposable diaper in such an environment, the reduction of loss on the production line and the stability of its quality are more important. Furthermore, in recent years, the weight reduction or softening of the non-woven fabric used in diapers has been progressing, and the non-woven fabric used as a material has been required to have a low weight per unit area. However, since the non-woven fabric and the film are bonded together in the diaper production line The hot melt penetrates and pollutes the production line, causing the problem of having to stop the production line.

As a method of suppressing hot melt penetration on the substrate, there are previously known methods to increase the weight per unit area of non-woven fabrics or methods to strengthen the thermal compression bonding of non-woven fabrics, but if the weight per unit area is increased, it is used as the softness of sanitary materials. Deterioration, there is a problem that the feeling becomes thicker. In addition, as for the method of strengthening the thermal compression bonding of the non-woven fabric, since the bending rigidity of the non-woven fabric becomes higher, the drape property is reduced or the skin feels rough.

The following Patent Document 1 discloses a method of producing a non-woven fabric with high flexibility by containing an ester compound in the fibers constituting the non-woven fabric. However, in this method, although the softness of the non-woven fabric is improved, since the ester compound has a higher affinity with the hot melt, there is a problem that the hot melt becomes easy to print through.

In addition, the following Patent Document 2 discloses a method of manufacturing a non-woven fabric with high flexibility by thinning the fibers constituting the non-woven fabric. However, in order to make the fiber thinner, the productivity needs to be reduced, so from the point of view of commercialization, the fibrillation of the long-fiber nonwoven fabric in the spunbond method is limited.

In addition, the following Patent Documents 3 and 4 disclose polyolefin-based long-fiber nonwoven fabrics that have a single yarn fineness or MFR within a certain range for the purpose of improving flexibility, and are suitable for use in sanitary materials such as disposable diapers The absorbent articles. However, Patent Documents 3 and 4 do not disclose the technical method of hot melt through-print suppression. Furthermore, the non-woven fabrics disclosed in Patent Documents 3 and 4 have an insufficient heat-compression bonding state, so there is a problem of easy fluffing. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2009-138311 [Patent Document 2] Japanese Patent No. 3529341 [Patent Document 3] Japanese Patent Laid-Open No. 2013-159884 [Patent Document 4] Japanese Patent Laid-Open No. 2012-072535

[The problem to be solved by the invention]

In view of the current status of the above technologies, the problem to be solved by the present invention is to provide a non-woven fabric that is suitable for the surface sheet, back sheet or side folds of absorbent articles used in sanitary materials with high flexibility, In addition, the hot melt has less penetration, and can maintain high process stability and productivity. [Technical means to solve the problem]

In order to solve the above-mentioned problems, the inventors of the present invention carried out intensive research and repeated experiments, and unexpectedly discovered that the contact area ratio of at least one side surface of the non-woven fabric is set to 30% or more and 60% or less, and the minimum unevenness of the surface is relatively The ratio of the thickness of the non-woven fabric is set to 15% or more and 50% or less, and it is preferable to set the apparent density of the concave portion of the surface excluding the hot-compression bonding portion to 0.01 g/cm ³ or more and 0.25 g/cm ³ or less. Therefore, the above-mentioned problems can be solved, and the present invention can be completed.

That is, the present invention is as follows. [1] The above-mentioned long-fiber non-woven fabric, which contains thermoplastic resin, characterized in that the contact area ratio of at least one surface of the non-woven fabric is 30% to 60%, and the ratio of the minimum unevenness to the thickness of the non-woven fabric is Above 15% and below 50%. [2] The long-fiber nonwoven fabric as described in [1] above, which has a thermocompression bonding portion. [3] The long-fiber nonwoven fabric as described in [1] or [2] above, wherein the apparent density of the recesses on the surface of the long-fiber nonwoven fabric other than the hot-compression bonding portion is 0.01 g/cm ³ or more 0.25 g/ cm ³ or less. [4] The long-fiber nonwoven fabric as described in any one of [1] to [3] above, which has a basis weight of 8 g/m ² or more and 50 g/m ² or less. [5] The long-fiber nonwoven fabric according to any one of [1] to [4] above, wherein the average fiber diameter of the long fibers constituting the long-fiber nonwoven fabric is 1 μm or more and 25 μm or less. [6] The long-fiber nonwoven fabric described in any one of [1] to [5] above has an air permeability of 50 cm ³ /cm ² /sec or more and 1000 cm ³ /cm ² /sec or less. [7] The long-fiber nonwoven fabric described in any one of [1] to [6] above has a tensile strength of 10 N/50 mm or more and 180 N/50 mm or less. [8] The long-fiber nonwoven fabric described in any one of [1] to [7] above, wherein the long fibers constituting the long-fiber nonwoven fabric are polyolefin-based fibers. [9] The long-fiber nonwoven fabric described in [8] above, wherein the polyolefin-based fiber is a polypropylene-based fiber. [10] The long-fiber non-woven fabric as described in [8] or [9] above, wherein the long-fiber non-woven fabric contains an ester having a melting point of 70° C. or more in an amount of 0.3% by weight to 5% by weight relative to the weight of the long fibers constituting the long-fiber nonwoven fabric The compound acts as a softener. [11] The long-fiber nonwoven fabric as described in any one of [8] to [10] above, wherein the MFR is 70% by weight relative to the weight of the long fibers constituting the long-fiber nonwoven fabric at 5 wt% to 30 wt% Polyolefin resin with g/10 min or less and melting point below 120°C. [12] A sanitary material comprising the long-fiber nonwoven fabric as described in any one of [1] to [11] above. [13] The sanitary material as described in [12] above, which has the form of a disposable diaper, a sanitary napkin or an incontinence pad. [Effects of Invention]

The non-woven fabric of the present invention is a long-fiber non-woven fabric containing a thermoplastic resin, and by setting the ratio of the contact area of at least one side surface of the non-woven fabric and the ratio of the minimum unevenness of the surface to the thickness of the non-woven fabric within a specific range, In the production line of sanitary materials, the hot-melt through-printing is sufficiently suppressed, and high process stability and productivity can be maintained. Furthermore, by setting the density of the recesses on the surface of the nonwoven fabric within a specific range, a nonwoven fabric with high flexibility can be obtained. In addition, the non-woven fabric of the present invention can sufficiently suppress the hot melt penetration even when it contains an ester compound. Therefore, the non-woven fabric of the present invention is suitable for the surface sheet, back sheet, or side folds of absorbent articles used in sanitary materials with high flexibility.

Hereinafter, embodiments of the present invention will be described in detail. The long-fiber non-woven fabric of this embodiment is a long-fiber non-woven fabric containing a thermoplastic resin, and is characterized in that the contact area ratio of at least one surface of the non-woven fabric having a heat-compression joint portion is 30% to 60%, and the smallest unevenness is relatively The ratio of the thickness of the non-woven fabric is 15% to 50%.

Examples of the long fibers constituting the nonwoven fabric containing the thermoplastic resin include polyolefin fibers such as polyethylene, polypropylene, and copolymer polypropylene, polyethylene terephthalate fibers, polybutylene terephthalate fibers, and polyolefin fibers. Polyester-based fibers such as ethylene naphthalate fiber, copolyester, nylon-6 fiber, nylon-66 fiber, polyamide-based fiber such as copolyamide, polylactic acid, polybutylene succinate, polybutylene Biodegradable fibers such as ethylene glycol. From the viewpoints of main use as a sanitary material, strength, flexibility, cost, etc., the thermoplastic long fiber is preferably a polyolefin-based fiber. Examples of polyolefin-based fibers include polyethylene, polypropylene, and fibers containing resins such as copolymers of these monomers and other α-olefins. Among them, the polypropylene fiber is preferred from the viewpoint that the strength is strong, it is not easily broken during use, and is excellent in dimensional stability when producing sanitary materials. Polypropylene can be a polymer synthesized by Ziegler-Natta catalyst in general, or a polymer synthesized by a single-site active catalyst represented by metallocene. In addition, it may be ethylene random copolymer polypropylene, preferably the ethylene content is less than 2%, and more preferably less than 1%. As other α-olefins, those having 3 to 10 carbon atoms, specifically, propylene, 1-butene, 1-pentene, 1-hexane, 4-methyl-1-pentene, 1- Octene etc. These may be used individually by 1 type, and may be used in combination of 2 or more types.

In addition, in order to soften the fiber itself, the thermoplastic long fiber may contain a low-melting polyolefin resin. In order to suppress the crystallinity of the thermoplastic filaments, the melting point is preferably 120°C or less, more preferably 50°C or more and 110°C or less, and still more preferably 60°C or more and 105°C or less. If the melting point of the low-melting polyolefin resin is below 120°C, the resin constituting the polyolefin fiber can be a random copolymer, an alternating copolymer, a block copolymer, or a graft copolymer. Regular resins can also be polyolefin elastomers. From the viewpoint of compatibility, the resin constituting the thermoplastic long fiber is preferably a polypropylene resin.

The MFR of the low melting point polyolefin resin is preferably 70 g/10 min or less, more preferably 5 g/10 min or more and 60 g/10 min or less, and particularly preferably 10 g/10 min or more and 40 g/10 min or less . When the MFR is within this range, there are very few yarn strands and excellent spinnability.

For the thermoplastic long fibers constituting the long-fiber nonwoven fabric of this embodiment, the content of the low melting point polyolefin resin constituting the thermoplastic long fibers is preferably 5% by weight to 30% by weight, more preferably 10% by weight to 20% by weight the following. If the content of the low-melting-point polyolefin resin is within this range, the bending flexibility or slipperiness of the non-woven fabric is significantly improved.

As the thermoplastic long fibers, polyester fibers such as polyolefin fibers, polyethylene terephthalate fibers, polybutylene terephthalate fibers, polyethylene naphthalate fibers, and copolyesters can be used. Polyamide-based fibers such as nylon-6 fiber, nylon-66 fiber, and copolymer nylon, polylactic acid, polybutylene succinate, polyethylene succinate, and other biodegradable fibers, one or a combination of two Above, it is preferable to use one type alone. The thermoplastic filament may be a core sheath fiber with a polyolefin resin as the surface layer. In addition, the fiber shape is not only a normal round fiber, but also a special shape fiber such as a crimped fiber and a special-shaped fiber.

From the standpoint of strength and dimensional stability, as the resin constituting the thermoplastic long fiber, it is particularly preferably one with homopolypropylene as the main component. Also, in the case of polypropylene, the lower limit of MFR may preferably be 20 g/10 minutes or more, more preferably may exceed 30 g/10 minutes, still more preferably may exceed 40 g/10 minutes, and even more preferably For more than 53 g/10 minutes. The upper limit of MFR may preferably be 100 g/10 min or less, more preferably 85 g/10 min or less, still more preferably 70 g/10 min or less, and still more preferably less than 65 g/10 min. If the MFR is in this range, a non-woven fabric with good resin fluidity and good bending flexibility can be obtained. MFR is calculated according to Table 1 of JIS-K7210 "Plastics and Thermoplastic Melt Mass Flow Rate (MFR) and Melt Volume Flow Rate (MVR) Test Method" Table 1, test temperature 230℃, test load 2.16 kg By.

The thermoplastic long fibers constituting the long-fiber nonwoven fabric of this embodiment can be blended with polyolefin-based fibers, for example, nucleating agents, flame retardants, inorganic fillers, pigments, colorants, heat-resistant stabilizers, antistatic agents, and the like.

The manufacturing method of the long-fiber nonwoven fabric of the present embodiment is not particularly limited, but in terms of a manufacturing method that does not provide unnecessary treatment agents, such as higher strength, oil treatment, etc., the spunbond method is preferred.

When the long-fiber nonwoven fabric of this embodiment is a spunbonded nonwoven fabric, it is not only a nonwoven fabric formed by spunbonding only, but also a spunbonded (S) fabric sheet formed by spraying and melting. The cloth sheet can be melt-spun and laminated by the spray (M) method. From the viewpoint of productivity, the state of the layer can be layered as SS, SSS, SSSS or as SM, SMS, SMMS, SSMMS, SMSMS.

The fiber diameter of the meltblown nonwoven fabric layer (M) may preferably be 1 μm or more and 10 μm or less, more preferably 1 μm or more and 8 μm or less, and more preferably 1 μm or more and 5 μm or less. As long as the fiber diameter is 1 μm or more, there is no need to increase the polymer temperature to an extremely high temperature in order to reduce the melt viscosity of the polymer during spinning, so the spinnability is better and the production is easy. On the other hand, if the fiber diameter is 10 μm or less, the fiber diameter is thinner, so the appearance of the non-woven fabric can be maintained to be more beautiful.

The weight per unit area of the meltblown non-woven fabric layer (M) is preferably 0.5 g/m ² or more and 5 g/m ² or less, more preferably 0.5 g/m ² or more and 4 g/m ² or less, and more preferably It is 0.5 g/m ² or more and 3 g/m ² or less. If the weight per unit area is 5 g/m ² or less, the softness of the non-woven fabric can be ensured, and it can be preferably used as a sanitary material.

The polymer constituting the melt-blown non-woven fabric layer (M) is not particularly limited, and when combined with a spun-bonded non-woven fabric using polyolefin-based fibers, a polyolefin-based polymer is preferred. From the viewpoint of spinnability, as the polymer constituting the melt-blown nonwoven fabric layer (M), for example, polyethylene-based polymers, polypropylene-based polymers, and polypropylene-based copolymers are preferred.

In the long-fiber nonwoven fabric of the present embodiment, in terms of reducing the area of the hot melt staining the stroke line of the back surface of the nonwoven fabric and maintaining good wrinkles, the contact area ratio of at least one surface is 30% 60% or less, preferably 35% or more and 57% or less, and more preferably 45% or more and 55% or less, in order to set the distance between the back of the non-woven fabric and the step line to a specific range and prevent the hot melt penetrating to the back from staining Stroke line, and the minimum unevenness of the surface relative to the thickness of the non-woven fabric is 15% or more and 50% or less, preferably 15% or more and 40% or less, and more preferably 15% or more and 30% or less, and more preferably It is 15% or more and 20% or less, and the best can be 15% or more and 17% or less. With this configuration, it is possible to suppress the hot melt penetration on the diaper production line, and to maintain high process stability and productivity, and further suppress fluffing to a high degree. In addition, in the long-fiber nonwoven fabric of this embodiment, at least one surface having the contact area ratio and the smallest unevenness in the above range is the surface to which the hot melt is applied, but the surface having the contact area ratio and the smallest unevenness in the above range may also exist Two sides.

In the coating test shown in this embodiment, the hot melt through-print weight of the long-fiber nonwoven fabric of this embodiment is preferably less than 15 mg/min. Thereby, high process stability and productivity can be maintained without soiling the rollers in a general diaper production line.

In order to maintain flexibility, the long-fiber non-woven fabric of this embodiment may preferably have an apparent density of the recesses on the at least one surface other than the hot-compression bonding part of 0.01 g/cm ³ or more and 0.25 g/cm ³ or less, more preferably It may be 0.01 g/cm ³ or more and 0.23 g/cm ³ or less, and more preferably 0.01 g/cm ³ or more and 0.20 g/cm ³ or less. The surface roughness is provided by pressure bonding in a way that can suppress hot melt bleeding. However, if the processing such as the roughness is applied to the extreme, the apparent density of the concave portions other than the hot-compression bonded portion becomes higher. If the apparent density of the recesses other than the hot-compression joint is 0.01 g/cm ³ or more, there is no risk of hot melt adhesive bleeding. On the other hand, if it is 0.25 g/cm ³ or less, there is no loss The softness of non-woven fabric is concerned.

The weight per unit area of the long-fiber nonwoven fabric of this embodiment may preferably be 8 g/m ² or more and 50 g/m ² or less, more preferably 10 g/m ² or more and 35 g/m ² or less, and more preferably 10 g/m ² or more and 25 g/m ² or less, more preferably 10 g/m ² or more and less than 23 g/m ² . If the weight per unit area is 8 g/m ² or more, it meets the toughness required for non-woven fabrics used in sanitary materials. On the other hand, if it is 50 g/m ² or less, it meets the softness of non-woven fabrics used in sanitary materials. , Also, does not give a heavy impression on the appearance.

The average fiber diameter of the long fibers constituting the long-fiber nonwoven fabric of this embodiment, such as polyolefin fibers, may preferably be 1 μm or more and 25 μm or less, more preferably 1 μm or more and 23 μm or less, and more preferably 1 μm. Above 20 μm. Since the long-fiber nonwoven fabric of this embodiment is mainly used as a sanitary material, from the viewpoint of the toughness of the non-woven fabric, the average fiber diameter constituting the long fibers is preferably 25 μm or less.

The air permeability of the long-fiber non-woven fabric of this embodiment is preferably 50 cm ³ /cm ² /sec or more and 1000 cm ³ /cm ² /sec or less, more preferably 150 cm ³ /cm ² /sec or more and 700 cm ³ / cm ² /sec or less, and more preferably 200 cm ³ /cm ² /sec or more and 600 cm ³ /cm ² /sec or less. If the air permeability is 50 cm ³ /cm ² /sec or more, it will have sufficient air permeability when used as a sanitary material.

From the viewpoint of both the prevention of wrinkles caused by the width of the diaper production line and flexibility, the tensile strength of the long-fiber non-woven fabric of this embodiment is preferably 10 N/50 mm or more and 180 N/50 mm Below, more preferably 15 N/50 mm or more and 150 N/50 mm or less, and still more preferably 20 N/50 mm or more and 100 N/50 mm or less.

The long-fiber nonwoven fabric of this embodiment may contain a softener. The softening agent is not particularly limited, and an ester compound or an amide compound can be used, but an ester compound is particularly preferred, and an ester compound of a trivalent to hexavalent polyol and a monocarboxylic acid is more preferred. Examples of trivalent to hexavalent polyols include trivalent polyols such as glycerin and trimethylolpropane, and tetravalent polyols such as pentaerythritol, glucose, sorbitol anhydride, diglycerol, and ethylene glycol diglyceride. , Triglycerin, trimethylolpropane diglyceryl ether and other pentavalent polyols, sorbitol, tetraglycerol, dipentaerythritol and other hexavalent polyols.

Examples of monocarboxylic acids include caprylic acid, dodecanoic acid, myristic acid, octadecanoic acid, behenic acid, hexadecanoic acid, octadecenoic acid, docosenoic acid, and isostearic acid. Alicyclic monocarboxylic acids such as monocarboxylic acid and cyclohexanecarboxylic acid, aromatic monocarboxylic acids such as benzoic acid and methylphenylcarboxylic acid, hydroxyl groups such as hydroxypropionic acid, hydroxyoctadecanoic acid, and hydroxyoctadecenoic acid Sulfur-containing aliphatic monocarboxylic acids such as aliphatic monocarboxylic acid and alkylthiopropionic acid.

The ester compound does not need to be a single component, and may be a mixture of two or more types, or may be oils and fats derived from natural products. However, since the ester compound containing unsaturated fatty acid is easily oxidized and is easily oxidized and deteriorated during spinning, it is preferably saturated aliphatic monocarboxylic acid or aromatic monocarboxylic acid. Oils and fats derived from natural products are odorless and stable compared to raw oils, so hydrogen-added ester compounds are preferably used.

As the ester compound, the monocarboxylic acid has a larger molecular weight and a higher lipophilicity. Due to its high lipophilicity, it enters the amorphous part of the polyolefin-based fiber, hinders crystallization, and increases the amorphous area, thereby achieving the effect of reducing the bending flexibility. In order to obtain this effect, the melting point of the ester compound is preferably 70°C or higher, more preferably 80°C or higher and 150°C or lower. When the melting point of the ester compound has a wide range, the melting point means the average melting point. In addition, the ester compound may be mixed with other compositions such as ester compounds having a melting point of less than 70°C or other organic compounds.

When the long-fiber nonwoven fabric of this embodiment contains an ester compound, the ester compound is preferably contained in the resin before spinning by a polymer blending method, and the content is preferably 0.3% by weight or more relative to the polyolefin fiber 5.0% by weight or less. Even if the ester compound is added in a small amount, the bending flexibility or slipperiness is significantly improved, and even if the content is increased, no performance improvement commensurate with the content is found. Therefore, the added spinnability and smokeability may preferably be 5.0% by weight or less, more preferably 0.5% by weight or more and 3.5% by weight or less, and more preferably 0.5% by weight or more and 2.0% by weight or less.

In terms of flexibility and suppression of hot melt penetration, the methanol extraction amount of the long-fiber nonwoven fabric of this embodiment is preferably 0% by weight to 5.0% by weight, more preferably 0.1% by weight to 3.0% by weight. , And more preferably 0.1% by weight or more and 1.0% by weight. If it is 5.0% by weight or less, it is highly possible to have both high flexibility and hot melt penetration suppression. The amount of methanol extraction can be adjusted by appropriately selecting the type or amount of oil or additives used in the manufacture of non-woven fabrics. As the joining method of thermoplastic long fibers when manufacturing the long-fiber nonwoven fabric of this embodiment, there can be mentioned: partial thermo-compression joining method, hot air method, joining (hot melt) method using molten components, and various other methods, but it is easy to control the strength In terms of the contact area ratio with the surface of the non-woven fabric and the minimum unevenness of the surface, partial thermocompression bonding is preferred.

Partial thermocompression bonding can be performed, for example, by passing a cloth piece through a heated embossing roll, whereby the surface and back of the fabric can be integrated, such as pinpoints, bead patterns, horizontal oval, diamond, etc. Rectangular non-woven fabrics with ups and downs. From the viewpoint of productivity, it is preferable to use a heated embossing roll for partial thermocompression bonding.

When a heated embossing roll is used for partial thermocompression bonding, it is preferable that the temperature of the roll surface is preferably lower than the melting point of the polymer constituting the non-woven fabric by 5°C or more and 40°C or less. It may be a low temperature of 8°C or more and 30°C or less, more preferably a low temperature of 10°C or more and 25°C or less, and even more preferably a low temperature of 12°C or more and 20°C or less. If the temperature of the roll surface is lower than the melting point of the polymer by 5°C or more, the non-woven fabric can be prevented from melting and easy to heat embossing. On the other hand, if the temperature is lower than 40°C, it can be sufficiently heated Pressure bonding can maintain the strength of the non-woven fabric to a high degree.

Also, in terms of strength retention and flexibility, the area ratio of hot-compression bonding during partial hot-compression bonding may preferably be 3% to 50%, more preferably 4% to 35%, and more preferably It is 4% or more and 25% or less, and more preferably 5% or more and 20% or less.

From the standpoint of strength retention and flexibility, the area of each part of the thermocompression bonded part during partial thermocompression bonding may preferably be 0.1 mm ² or more and 5.0 mm ² or less, more preferably 0.2 mm ² or more and 3.0 mm ² or less, and the minimum distance between the thermocompression bonded parts may preferably be 1 mm or more and 10 mm or less, more preferably 2 mm or more and 8 mm or less. In addition, it is preferable that the heat-compression bonding part is evenly distributed over the entire surface of the non-woven fabric.

As a method of controlling the contact area ratio of the surface of the non-woven fabric and the minimum unevenness of the surface, there can be exemplified: the method of using a specific embossing shape embossing roll for partial thermal compression bonding, or the partial thermal compression bonding and then using the embossing roll and Method for calendering elastic rolls.

[Method of using embossing rollers with a specific embossing shape to perform partial thermocompression bonding and imparting unevenness to the surface of the non-woven fabric] From the viewpoint of suppressing both hot melt penetration and fluffing, the depth of the convex portion of the heating embossing roller during partial thermocompression bonding is preferably 0.8 mm or more and 3.0 mm or less, more preferably 0.8 mm or more and 2.0 mm or less . If the above depth is 0.8 mm or more, the surface of the non-woven fabric can be sufficiently uneven. On the other hand, if it is 3.0 mm or less, it is easy to process with embossing rollers.

[Partially hot-compression bonding and then using embossing roll and elastic roll calendering process] In addition, as another method of imparting unevenness to the surface of the non-woven fabric, there is a method of performing a calendering process using an embossing roll and an elastic roll in addition to the partial thermal compression bonding described above. As the shape of the embossing roller, any of tortoise shell, straight line, curve, corner, circle, pear skin, other continuous or discontinuous can be applied, but the surface contact area rate and softness effect of the processed non-woven fabric From a standpoint, the area ratio of the pressing portion of the unevenness is preferably 5% or more and 40% or less, and more preferably 5% or more and 25% or less. In terms of providing unevenness and maintaining flexibility, the depth of the concave portion of the embossing roll may preferably be 0.2 mm or more and 5.0 mm or less, more preferably 0.3 mm or more and 4.0 mm or less, and more preferably 0.4 mm or more and 3.0 mm below.

As the types of elastic rollers, there are rubber rollers, aromatic polyamide rollers, cotton rollers, and others, and are not particularly limited. However, from the viewpoint of imparting unevenness to the non-woven fabric, the hardness of the roller surface is preferably JIS-A hardness. It is 40 degrees or more and 80 degrees or less, more preferably it may be 50 degrees or more and 75 degrees or less, and still more preferably 55 degrees or more and 70 degrees or less.

In the case of calendering using an embossing roll and an elastic roll (between these), from the viewpoint of providing unevenness, as a processing line pressure, it is preferably 5 kgf/cm or more and 100 kgf/cm or less , More preferably 10 kgf/cm or more and 100 kgf/cm or less, more preferably 30 kgf/cm or more and 100 kgf/cm or less, and even more preferably 50 kgf/cm or more and 100 kgf/cm or less. In addition, the temperature of the embossing roll is preferably lower than the melting point of the thermoplastic resin constituting the non-woven fabric, such as polyolefin, preferably a low temperature of 30°C to 90°C, more preferably 30°C to 80°C, and more preferably It may be a low temperature of 40°C to 70°C, and more preferably 45°C to 65°C. If the processing line pressure is 5 kgf/cm or more and 100 kgf/cm, and the temperature of the embossing roll is lower than the melting point of the thermoplastic resin at a low temperature of 30°C or more and 90°C or less, the surface of the non-woven fabric can be given moderate unevenness without reducing the flexibility.

The hydrophilizing agent can be applied to the long-fiber non-woven fabric of this embodiment. As the hydrophilizing agent, considering the safety to the human body, the safety in the steps, etc., it is preferable to use higher alcohols, higher fatty acids, alkanols, and other nonionic active agents that add ethylene oxide alone or in the form of a mixture. , Anionic active agents such as alkyl phosphate, alkyl sulfate, etc.

The adhesion amount of the hydrophilizing agent varies according to the required performance, but it is usually 0.1% by weight or more and 1.0% by weight or less, and more preferably 0.15% by weight or more and 0.8% by weight, relative to the long fibers constituting the nonwoven fabric. , And more preferably 0.2% by weight or more and 0.6% by weight or less. If the adhesion amount of the hydrophilizing agent is in this range, the hydrophilic performance of the surface layer sheet as a sanitary material is satisfied, and the processability becomes good.

As a method of coating a hydrophilizing agent on the nonwoven fabric of the present embodiment of the long-fiber nonwoven fabric, a diluted hydrophilizing agent is usually used, and dipping, spraying, coating (contact coater, gravure coater) The existing method such as the) method is preferably to dilute the hydrophilizing agent mixed in advance as necessary with a solvent such as water and apply it.

If the hydrophilizing agent is diluted with a solvent such as water and applied, a drying step may be necessary. As the drying method at this time, well-known methods such as convection heat transfer, conduction heat transfer, and radiation heat transfer can be used. Drying using hot air or infrared rays or drying methods using thermal contact can be used.

The long-fiber non-woven fabric of this embodiment can prevent the hot melt agent from penetrating, so it can be preferably used in the manufacture of sanitary materials. As sanitary materials, examples include: disposable diapers, sanitary napkins or incontinence pads, preferably Used for the surface sheet, the outer back sheet, the side folds of the foot, etc. In addition, the use of the long-fiber nonwoven fabric of this embodiment is not particularly limited. For example, it can also be used for masks, warm patches, tape base cloth, waterproof sheet base cloth, patch medicine base cloth, emergency bandage base cloth, packaging materials, Wiping products, medical gowns, bandages, clothing materials, skin care sheets, etc. [Example]

Hereinafter, the present invention will be specifically explained with examples and comparative examples, but the present invention is not limited to the following examples. In addition, the evaluation methods of various properties used in the examples and comparative examples are as follows, and the obtained physical properties are shown in Table 1 below.

1. The average thickness of the non-woven fabric (mm) Use a thickness measuring machine with a presser foot of 9 mm or more in diameter, and place it in the width direction for an appropriate time (about 10 seconds) until the thickness is stable with a load of 100 gf/cm ² The 5 parts of the test piece were measured at equal intervals, and the average value was taken as the thickness.

2. The weight per unit area of the non-woven fabric (g/m ² ) According to JIS-L1906, 5 test pieces of 20 cm × 5 cm are randomly selected to measure the mass, and the average value is converted into the weight per unit area.

3. Contact area rate (%) Except for the 10 cm at both ends of the non-woven fabric manufactured, divide it into 5 equal parts in the width direction. Sample a 1 cm square test piece, clamp it with a glass plate weighing 100 g, and use the VR3000-single trigger 3D microscope manufactured by Keyence to measure 12 The center of the sample was taken at the magnification of the magnification, and a small area of less than 100 pixels (except for the thermocompression junction) was cut out, and the contour curve was obtained, and then the average height difference was calculated. Next, using the above average height difference as a standard, the concave portion and the convex portion are binarized based on this value to obtain a binarized contour graph. Calculate the area ratio (%) of the convex part based on the obtained binarized contour curve diagram, and use the average value of each of the 5 points as the contact area ratio. Contact area ratio (%) = the total area ratio of the convex part (%)/5

4. The ratio of the minimum unevenness of the surface of the non-woven fabric to the thickness of the non-woven fabric (%) Extract data from the line area in the MD direction and CD direction in the center of the contour curve obtained by the measurement with the 3D microscope, and obtain the polyline curve diagram of the height difference. Secondly, calculate the maximum value of the depth of the recess (the distance from the average thickness of the non-woven fabric to the bottom of the recess) according to the obtained graph. Divide the average value of each 5 points by the average thickness of the non-woven fabric measured by the above method, and use the calculated value as the minimum unevenness ratio (%). The minimum unevenness ratio (%) = (average of the maximum depth of the recess (mm)/thickness (mm))×100

5. The apparent density of the recesses (g/cm ³ ) Calculate the average depth of the recesses based on the above-mentioned contour curve obtained by the 3D microscope measurement. Secondly, the apparent density of the recesses is divided by the weight per unit area of the nonwoven fabric by the difference between the average thickness of the nonwoven fabric and the average depth of the recesses. Apparent density of recesses (g/cm ³ ) = weight per unit area (g/m ² )/(average thickness of non-woven fabric (mm)-average depth of recesses (mm)/1000

6. Average fiber diameter (μm) Except the 10 cm at both ends of the non-woven fabric, divide it into approximately 5 equal parts in the width direction, sample 1 cm square test pieces, measure the diameter of each 20 fibers with a microscope, and use the average value as the average fiber diameter.

7. Air permeability (cm ³ /cm ² /sec) According to JIS-L1096, randomly take 5 test pieces of 15 cm long x 15 cm wide, use a Frazir type testing machine, install the sample on one end of the cylinder, borrow The suction fan is adjusted by the addition and subtraction resistor, and the air is sucked in the way that the inclined barometer shows 1.27 cm of water column. According to the pressure shown by the vertical barometer at this time and the type of air hole used, it is calculated by the meter attached to the testing machine The amount of air passing through the sample is calculated, and the average value is taken as the air permeability.

8. Tensile strength (N/50 mm) According to JIS L-1906, take 5 specimens of 5 cm in the CD direction and 20 cm in the MD direction in a uniform position in the CD direction of the non-woven fabric. Use a tensile testing machine with a clamp spacing of 10 cm and a tensile speed of 30 cm /Minute for measurement. The samples at 5 locations in each MD direction were measured, and the measured values were averaged to calculate the tensile strength.

50 mm之不旋轉驅動之固定輥(表面硬質鍍鉻、鏡面拋光)。 使上述步驟中寬30 cm之不織布自捲出機至捲取機導布，以線速度10m/min、步驟張力10 N/m使其移行。其次，自其上於手提式噴槍內使Henkel Japan股份有限公司製造之TECHNOMELT-DM-ME110E之熱熔劑於150℃下熔融，於手提式噴槍與不織布之間隙30 mm、塗佈量250 g/m² 、延伸氣體風速18 m/sec條件下進行塗佈。 進行1分鐘塗佈之後，測定轉印至固定輥上之透印之熱熔劑之重量，測量熱熔透印重量，作為熱熔透印重量。9. Hot-melt through-printing weight (mg/min) The REKA portable spray gun TR80 LCD manufactured by Suntool Co., Ltd. is mounted on the bypass with the winding device of the winding machine and the winding machine, at a distance of 60 cm from the downstream side. The part is configured from the back of the non-woven fabric with an angle of 90° and

50 mm non-rotating fixed roller (surface hard chrome plating, mirror polishing). Guide the non-woven fabric with a width of 30 cm in the above step from the unwinder to the winder, and move it at a linear speed of 10m/min and a step tension of 10 N/m. Secondly, the hot melt of TECHNOMELT-DM-ME110E manufactured by Henkel Japan Co., Ltd. was melted in a portable spray gun at 150℃. The gap between the portable spray gun and the non-woven fabric was 30 mm, and the coating amount was 250 g/m. ^2. Coating is carried out under the condition of stretching gas wind speed 18 m/sec. After coating for 1 minute, measure the weight of the hot melt transferred to the fixed roller and measure the hot melt through weight as the hot melt through weight.

10. Evaluation of fine hair Take 5 test pieces of 25 mm×300 mm in the MD direction, use the Japan Society for the Promotion of Science Fastness Tester, the load of the friction element is 200 g, use the same cloth on the side of the friction element, perform 150 reciprocating motions, press The following evaluation criteria were judged, and the average value was calculated. Grade 5.0: No fluff Level 4.0: The fiber is about 1 to 2 or the hair starts to appear in one place. Level 3.0: Clear hair balls begin to appear, or multiple small hair balls are found Class 2.0: The fiber is severely peeled to the extent that the test piece becomes thin Class 1.0: The fiber is peeled to the extent that the test piece is broken

11. Methanol extraction volume Measure the weight (W1) of the non-woven fabric under a humidity control of 25℃×40%RH for 24 hours, and use methanol to measure from the non-woven fabric sample using a rapid residual fat extraction machine (Intec Co., Ltd. type: OC-1) The extracted residue (W2), by the following formula: Methanol extraction volume (wt%) = [W2/W1]×100 Find the extraction volume. In addition, the rapid extraction operation is to fill the test tube with 2 g of sample, then inject 10 cc of methanol into the test tube once, and immediately squeeze out the methanol with an extrusion rod.

100 mm-144H-

0.4 mm之圓形噴嘴，以單孔噴出量0.56 g/min・H、紡絲溫度215℃擠出MFR為60 g/10分鐘(依據JIS-K7210，於溫度230℃、荷重2.16 kg下測定)之聚丙烯(PP)樹脂，藉由空氣噴射牽引該線群，於輸送網(透氣度：270 cm³ /cm² /sec)上堆積平均纖維直徑13 μm之長纖維布片。使用溫度140℃之壓實輥(表面材質：HCr、梨皮花樣)與支承輥(表面材質：硬度90°合成橡膠)以接觸壓4.2 kgf/cm暫時壓接獲得之長纖維布片。[Example 1] By spunbonding, using

100 mm-144H-

A round nozzle of 0.4 mm, with a single-hole ejection rate of 0.56 g/min·H and a spinning temperature of 215°C, the extrusion MFR is 60 g/10 minutes (based on JIS-K7210, measured at a temperature of 230°C and a load of 2.16 kg) The polypropylene (PP) resin is drawn by air jet, and the long fiber cloth sheet with an average fiber diameter of 13 μm is deposited on the conveying net (air permeability: 270 cm ³ /cm ² /sec). Use a compacting roller (surface material: HCr, pear-skin pattern) and a support roller (surface material: 90°hardness synthetic rubber) at a temperature of 140℃ to temporarily crimp the long fiber cloth sheet obtained at a contact pressure of 4.2 kgf/cm.

Secondly, the obtained long-fiber cloth sheet is passed through a smoothing roller and an embossing roller (pattern specifications: diameter 0.425 mm round, staggered arrangement, horizontal spacing 2.1 mm, vertical spacing 1.1 mm, crimping area ratio 10.6%, embossing depth 0.7 mm), the fibers are bonded to each other at a temperature of 145°C and a line pressure of 25 kgf/cm to obtain a long-fiber nonwoven fabric with a unit area weight of 17 g/m ² .

Secondly, make the obtained long fiber non-woven fabric pass through a continuous linear hexagonal pattern with a side of 0.9 mm and a line width of 0.1 mm (pressing area ratio 12.5%, pattern spacing; length 2.8 mm, width 3.2 mm, depth; 0.7 mm) Between the embossing roll heated to 95°C and the rubber roll with a surface hardness of 60 degrees (JIS-Shore A height), calendering is performed at a linear pressure of 50 kgf/cm to obtain a weight per unit area of 17 g/m ² The uneven long fiber non-woven fabric. The physical properties and hot melt through-print weight of the obtained long-fiber non-woven fabric with unevenness are shown in Tables 1 and 2 below.

100 mm-144H-

0.4 mm之圓形噴嘴，以單孔噴出量0.56 g/min・H、紡絲溫度215℃擠出MFR為60 g/10分鐘(依據JIS-K7210，於溫度230℃、荷重2.16 kg下測定)之聚丙烯(PP)樹脂，將實施例1中之線速度提高1.3倍，除此以外，使藉由空氣噴射而牽引該線群之長纖維布片以與實施例1相同之方式，獲得具有單位面積重量13 g/m² 之凹凸之長纖維不織布。將獲得之具有凹凸之長纖維不織布之物性與熱熔透印重量示於以下表1、2。[Example 2] By spunbonding, using

100 mm-144H-

A round nozzle of 0.4 mm, with a single-hole ejection rate of 0.56 g/min·H and a spinning temperature of 215°C, the extrusion MFR is 60 g/10 minutes (based on JIS-K7210, measured at a temperature of 230°C and a load of 2.16 kg) In addition to the polypropylene (PP) resin, the linear speed in Example 1 was increased by 1.3 times. In addition, the long-fiber cloth sheet of the thread group was drawn by air jet in the same manner as in Example 1. Long-fiber non-woven fabric with uneven weight of 13 g/m ² per unit area. The physical properties and hot melt through-print weight of the obtained long-fiber non-woven fabric with unevenness are shown in Tables 1 and 2 below.

100 mm-144H-

0.4 mm之圓形噴嘴，以單孔噴出量0.56 g/min・H、紡絲溫度215℃擠出MFR為60 g/10分鐘(依據JIS-K7210，於溫度230℃、荷重2.16 kg下測定)之聚丙烯(PP)樹脂，提高實施例1中之空氣噴射量，以平均纖維直徑成為8 μm之方式調整，除此以外，以與實施例1相同之方式，獲得具有單位面積重量17 g/m² 之凹凸之長纖維不織布。將獲得之具有凹凸之長纖維不織布之物性與熱熔透印重量示於以下表1、2。[Example 3] By spunbonding, using

100 mm-144H-

A round nozzle of 0.4 mm, with a single-hole ejection rate of 0.56 g/min·H and a spinning temperature of 215°C, the extrusion MFR is 60 g/10 minutes (based on JIS-K7210, measured at a temperature of 230°C and a load of 2.16 kg) For polypropylene (PP) resin, the amount of air injection in Example 1 was increased, and the average fiber diameter was adjusted to 8 μm. Except for this, in the same manner as Example 1, a weight per unit area of 17 g/ m ² uneven long fiber non-woven fabric. The physical properties and hot melt through-print weight of the obtained long-fiber non-woven fabric with unevenness are shown in Tables 1 and 2 below.

100 mm-144H-

0.4 mm之圓形噴嘴，以單孔噴出量0.56g/min・H、紡絲溫度215℃擠出MFR為60 g/10分鐘(依據JIS-K7210，於溫度230℃、荷重2.16 kg下測定)之聚丙烯(PP)樹脂，提高實施例1中之空氣噴射量，以平均纖維直徑成為25 μm之方式調整，除此以外，以與實施例1相同之方式獲得具有單位面積重量17 g/m² 之凹凸之長纖維不織布。將獲得之具有凹凸之長纖維不織布之物性與熱熔透印重量示於以下表1、2。[Example 4] By spunbonding, using

100 mm-144H-

A round nozzle of 0.4 mm, with a single-hole ejection rate of 0.56g/min·H and a spinning temperature of 215°C, the extrusion MFR is 60 g/10 minutes (based on JIS-K7210, measured at a temperature of 230°C and a load of 2.16 kg) For polypropylene (PP) resin, the amount of air injection in Example 1 was increased, and the average fiber diameter was adjusted to 25 μm. Except for this, the same method as Example 1 was used to obtain a weight per unit area of 17 g/m ^2. Concave-convex long-fiber non-woven fabric. The physical properties and hot melt through-print weight of the obtained long-fiber non-woven fabric with unevenness are shown in Tables 1 and 2 below.

100 mm-144H-

0.4 mm之圓形噴嘴，以單孔噴出量0.56g/min・H、紡絲溫度215℃擠出MFR為60 g/10分鐘(依據JIS-K7210，於溫度230℃、荷重2.16 kg下測定)之聚丙烯(PP)樹脂，藉由空氣噴射而牽引該線群，於輸送網(透氣度：270 cm³ /cm² /sec)上堆積平均纖維直徑13 μm之長纖維布片。使用溫度140℃之壓實輥(表面材質：HCr、梨皮花樣)與支承輥(表面材質：硬度90°合成橡膠)並以接觸壓4.2 kgf/cm暫時壓接獲得之長纖維布片。[Example 5] By spunbonding, using

100 mm-144H-

A round nozzle of 0.4 mm, with a single-hole ejection rate of 0.56g/min·H and a spinning temperature of 215°C, the extrusion MFR is 60 g/10 minutes (based on JIS-K7210, measured at a temperature of 230°C and a load of 2.16 kg) The polypropylene (PP) resin is drawn by air jets to draw the thread group, and a long fiber cloth sheet with an average fiber diameter of 13 μm is deposited on the conveying net (air permeability: 270 cm ³ /cm ² /sec). Use a compaction roller (surface material: HCr, pear-skin pattern) and a support roller (surface material: 90°hardness synthetic rubber) at a temperature of 140℃ and temporarily crimp the long fiber cloth sheet obtained with a contact pressure of 4.2 kgf/cm.

Secondly, the obtained long-fiber cloth sheet is passed through a smoothing roller and an embossing roller (pattern specifications: diameter 0.425 mm round, staggered arrangement, horizontal spacing 2.1 mm, vertical spacing 1.1 mm, crimping area ratio 10.6%, embossing depth 0.7 mm), the fibers are bonded to each other at a temperature of 145°C and a line pressure of 25 kgf/cm to obtain a long-fiber nonwoven fabric with a unit area weight of 17 g/m ² .

之水珠花紋(壓抵面積率14.4%、深度；1.3 mm)之加溫至100℃之壓花輥與表面硬度60度(JIS-蕭氏A硬度)之橡膠輥之間，以線壓60 kgf/cm實施軋光加工，獲得具有單位面積重量17 g/m² 之凹凸之長纖維不織布。將獲得之具有凹凸之長纖維不織布之物性與熱熔透印重量示於以下表1、2。Secondly, make the obtained long fiber non-woven fabric pass through 0.5 mm

Between the embossing roller heated to 100℃ and the rubber roller with a surface hardness of 60 degrees (JIS-Shore A hardness) with a linear pressure of 60 degrees (indentation area ratio 14.4%, depth; 1.3 mm) The kgf/cm is calendered to obtain a long-fiber non-woven fabric with unevenness of 17 g/m ² per unit area. The physical properties and hot melt through-print weight of the obtained long-fiber non-woven fabric with unevenness are shown in Tables 1 and 2 below.

[Example 6] The glyceryl ester of octadecanoic acid (hydrogenated animal and vegetable oil), which has a melting point of 88°C as an ester compound, is mixed with a MFR of 60 g/10 minutes (according to JIS-K7210, at a temperature of 230°C, load Except for the polypropylene (PP) resin measured at 2.16 kg), a long-fiber nonwoven fabric with unevenness was obtained in the same manner as in Example 1. The physical properties and hot melt through-print weight of the obtained long-fiber non-woven fabric with unevenness are shown in Tables 1 and 2 below.

[Example 7] The glyceryl ester of octadecanoic acid (hydrogenated animal and vegetable oil), which has a melting point of 88°C as an ester compound, is mixed with a MFR of 60 g/10 minutes (according to JIS-K7210, at a temperature of 230°C, load 2.16 kg) polypropylene (PP) resin, and then mixed with a low melting point polypropylene elastomer with a melting point of 104°C and MFR of 18 g/min so as to become 5 wt%. In addition, In the same manner as in Example 1, a long-fiber nonwoven fabric with unevenness was obtained. The physical properties of the obtained long-fiber nonwoven fabric and the hot melt through-print weight are shown in Tables 1 and 2 below.

[Example 8] Mix octadecanoic acid glyceride (hydrogenated animal and vegetable fats) of an ester compound with a melting point of 88°C so that the purity becomes 1.25% by weight in MFR of 60 g/10 minutes (according to JIS-K7210, at a temperature of 230°C and a load of 2.16 kg) polypropylene (PP) resin, and then mixed with a low melting point polypropylene elastomer with a melting point of 104°C and an MFR of 18 g/min so as to become 10% by weight. In addition, with In the same manner as in Example 1, a long-fiber nonwoven fabric with unevenness was obtained. The physical properties of the obtained long-fiber nonwoven fabric and the hot melt through-print weight are shown in Tables 1 and 2 below.

[Example 9] The glyceryl ester of octadecanoic acid (hydrogenated animal and vegetable oil), which has a melting point of 88°C as an ester compound, is mixed with a MFR of 60 g/10 minutes (according to JIS-K7210, at a temperature of 230°C, load 2.16 kg) polypropylene (PP) resin, and then mixed with a low melting point polypropylene elastomer with a melting point of 104°C and an MFR of 18 g/min so as to become 15% by weight. In addition, In the same manner as in Example 1, a long-fiber nonwoven fabric with unevenness was obtained. The physical properties and hot melt through-print weight of the obtained long-fiber non-woven fabric with unevenness are shown in Tables 1 and 2 below.

[Example 10] The glyceryl ester of stearyl acid (hydrogenated animal and vegetable oil), which is an ester compound with a melting point of 88°C, was mixed with a MFR of 60 g/10 minutes (according to JIS-K7210, A polypropylene (PP) resin with a temperature of 230°C and a load of 2.16 kg) was mixed with a low-melting polypropylene elastomer with a melting point of 104°C and an MFR of 18 g/min so as to become 20% by weight. Except for this, in the same manner as in Example 1, a long-fiber nonwoven fabric having irregularities of 17 g/m ² per unit area weight was obtained. The physical properties of the obtained long-fiber nonwoven fabric and the hot melt through-print weight are shown in Tables 1 and 2 below.

100 mm-144H-

0.4 mm之圓形噴嘴，以單孔噴出量0.56 g/min・H、紡絲溫度215℃擠出MFR為60 g/10分鐘(依據JIS-K7210，於溫度230℃、荷重2.16 kg下測定)之聚丙烯(PP)樹脂，藉由空氣噴射而牽引該線群，於輸送網(透氣度：270 cm³ /cm² /sec)上堆積平均纖維直徑13 μm之長纖維布片。使用溫度140℃之壓實輥(表面材質：HCr、梨皮花樣)與支承輥(表面材質：硬度90°合成橡膠)，以接觸壓4.2 kgf/cm暫時壓接獲得之長纖維布片。[Example 11] By spunbonding, using

100 mm-144H-

A round nozzle of 0.4 mm, with a single-hole ejection rate of 0.56 g/min·H and a spinning temperature of 215°C, the extrusion MFR is 60 g/10 minutes (based on JIS-K7210, measured at a temperature of 230°C and a load of 2.16 kg) The polypropylene (PP) resin is drawn by air jets to draw the thread group, and a long fiber cloth sheet with an average fiber diameter of 13 μm is deposited on the conveying net (air permeability: 270 cm ³ /cm ² /sec). Use a compaction roller (surface material: HCr, pear-skin pattern) and a support roller (surface material: 90°hardness synthetic rubber) at a temperature of 140℃ to temporarily crimp the long fiber cloth sheet obtained at a contact pressure of 4.2 kgf/cm.

Secondly, the obtained long fiber cloth sheet is passed through a smoothing roller and an embossing roller (pattern specifications: horizontal oval shape, staggered arrangement, horizontal spacing 2.8 mm, vertical spacing 2.8 mm, crimping area ratio 13.3%, embossing depth 0.8 mm) In between, the fibers were bonded to each other at a temperature of 145°C and a linear pressure of 45 kgf/cm to obtain a long-fiber nonwoven fabric with a weight per unit area of 17 g/m ² . The physical properties of the obtained long-fiber nonwoven fabric and the hot melt through-print weight are shown in Tables 1 and 2 below.

100 mm-144H-

0.4 mm之圓形噴嘴，以單孔噴出量0.56 g/min・H、紡絲溫度215℃擠出MFR為60 g/10分鐘(依據JIS-K7210，於溫度230℃、荷重2.16 kg下測定)之聚丙烯(PP)樹脂，藉由空氣噴射而牽引該線群，於輸送網(透氣度：270 cm³ /cm² /sec)上堆積平均纖維直徑13 μm之長纖維布片。使用溫度140℃之壓實輥(表面材質：HCr、梨皮花樣)與支承輥(表面材質：硬度90°合成橡膠)，以接觸壓4.2 kgf/cm暫時壓接獲得之長纖維布片。[Example 12] By spunbonding, using

100 mm-144H-

A round nozzle of 0.4 mm, with a single-hole ejection rate of 0.56 g/min·H and a spinning temperature of 215°C, the extrusion MFR is 60 g/10 minutes (based on JIS-K7210, measured at a temperature of 230°C and a load of 2.16 kg) The polypropylene (PP) resin is drawn by air jets to draw the thread group, and a long fiber cloth sheet with an average fiber diameter of 13 μm is deposited on the conveying net (air permeability: 270 cm ³ /cm ² /sec). Use a compaction roller (surface material: HCr, pear-skin pattern) and a support roller (surface material: 90°hardness synthetic rubber) at a temperature of 140℃ to temporarily crimp the long fiber cloth sheet obtained at a contact pressure of 4.2 kgf/cm.

Secondly, the obtained long fiber cloth sheet is passed through a smoothing roller and an embossing roller (pattern specifications: water drop pattern, staggered arrangement, horizontal spacing 5.0 mm, vertical spacing 5.0 mm, crimping area ratio 14.4%, embossing depth 0.8 mm) In between, the fibers were bonded to each other at a temperature of 145°C and a linear pressure of 45 kgf/cm to obtain a long-fiber nonwoven fabric with a weight per unit area of 17 g/m ² . The physical properties of the obtained long-fiber nonwoven fabric and the hot melt through-print weight are shown in Tables 1 and 2 below.

[Example 13] The erucamide was mixed with a polypropylene (PP) resin with an MFR of 60 g/10 minutes (based on JIS-K7210, measured at a temperature of 230°C and a load of 2.16 kg) so that the purity became 1.0% by weight. , In the same manner as in Example 11, a long-fiber non-woven fabric with unevenness was obtained. The physical properties and hot melt through-print weight of the obtained long-fiber non-woven fabric with unevenness are shown in Tables 1 and 2 below.

[Example 14] The erucamide was mixed with a polypropylene (PP) resin with an MFR of 60 g/10 minutes (according to JIS-K7210, measured at a temperature of 230°C and a load of 2.16 kg) so that the purity became 1.0% by weight. A polypropylene elastomer with a melting point of 104°C and an MFR of 18 g/min was mixed at 10% by weight as a low-melting polypropylene elastomer. Except for this, in the same manner as in Example 12, a long fiber nonwoven fabric with unevenness was obtained . The physical properties and hot melt through-print weight of the obtained long-fiber non-woven fabric with unevenness are shown in Tables 1 and 2 below.

100 mm-144H-

0.4 mm之圓形噴嘴，以單孔噴出量0.56g/min・H、紡絲溫度215℃擠出，藉由空氣噴射而牽引該線群，以成為6 g/m² 之方式於輸送網(透氣度：270 cm³ /cm² /sec)上堆積平均纖維直徑13 μm之長纖維布片。使用溫度140℃之壓實輥(表面材質：HCr、梨皮花樣)與支承輥(表面材質：硬度90°合成橡膠)，以接觸壓4.2 kgf/cm暫時壓接獲得之長纖維布片。[Example 15] The glyceryl ester of stearyl acid (hydrogenated animal and vegetable oils), which has a melting point of 88°C as an ester compound, was mixed with a MFR of 60 g/10 minutes (according to JIS-K7210, in A polypropylene (PP) resin with a temperature of 230°C and a load of 2.16 kg) was mixed with a low-melting polypropylene elastomer with a melting point of 104°C and an MFR of 18 g/min so as to become 20% by weight. By spunbonding, using

100 mm-144H-

The round nozzle of 0.4 mm is extruded with a single-hole ejection volume of 0.56g/min·H and a spinning temperature of 215°C. The strands are drawn by air jets to form 6 g/m ² on the conveyor net ( Air permeability: 270 cm ³ /cm ² /sec) piled on long fiber cloth sheets with an average fiber diameter of 13 μm. Use a compaction roller (surface material: HCr, pear-skin pattern) and a support roller (surface material: 90°hardness synthetic rubber) at a temperature of 140℃ to temporarily crimp the long fiber cloth sheet obtained at a contact pressure of 4.2 kgf/cm.

Secondly, after the above spunbonding, the MFR is 1000 g/10 minutes (according to JIS-K7210, measured at 230°C under a load of 2.16 kg by means of a melt blowing method with a fiber diameter of 2 μm and 1 g/m ² ) Polypropylene (PP) resin laminate.

Secondly, the same S layer as the original S layer is laminated on the spunbond-meltblown cloth sheet by spunbonding. Use a compaction roller (surface material: HCr, pear skin pattern) and a support roller (surface material: 90°hardness synthetic rubber) at a temperature of 140℃ to temporarily crimp the long fiber cloth sheet obtained at a contact pressure of 4.2 kgf/cm. Spunbond-meltblown-spunbond 3-layer (SMS structure) long fiber cloth sheet.

Secondly, the obtained long-fiber cloth sheet is passed through a smoothing roller and an embossing roller (pattern specifications: diameter 0.363 mm oval, staggered arrangement, horizontal spacing 1.73 mm, vertical spacing 3.0 mm, crimping area ratio 14.0%, embossing depth 0.8 mm), the fibers are bonded to each other at a temperature of 145°C and a line pressure of 25 kgf/cm to obtain a long-fiber non-woven fabric of SMS structure with a total unit area weight of 13 g/m ² . The physical properties of the obtained long-fiber nonwoven fabric and the hot melt through-print weight are shown in Tables 1 and 2 below.

[Example 16] The long-fiber nonwoven fabric obtained by the same method as in Example 15 was passed through a continuous linear hexagonal pattern with a side of 0.9 mm and a line width of 0.1 mm (press area ratio 12.5%, pattern pitch; length 2.8 mm , Horizontal 3.2 mm, depth; 0.7 mm) between the embossing roller heated to 80℃ and the rubber roller with surface hardness of 100 degrees (JIS-Shore A hardness), calendering is carried out at a linear pressure of 60 kg/cm , To obtain a long-fiber non-woven fabric with irregularities of 17 g/m ² per unit area weight. The physical properties and hot melt through-print weight of the obtained long-fiber non-woven fabric with unevenness are shown in Tables 1 and 2 below.

100 mm-144H-

0.4 mm之圓形噴嘴，以單孔噴出量0.56 g/min・H、紡絲溫度215℃擠出MFR為60 g/10分鐘(依據JIS-K7210，於溫度230℃、荷重2.16 kg下測定)之聚丙烯(PP)樹脂，藉由空氣噴射而牽引該線群，於輸送網(透氣度：270 cm³ /cm² /sec)上堆積平均纖維直徑13 μm之長纖維布片。使用溫度140℃之壓實輥(表面材質：HCr、梨皮花樣)與支承輥(表面材質：硬度90°合成橡膠)以接觸壓4.2 kgf/cm暫時壓接獲得之長纖維布片。[Comparative Example 1] By spunbonding, using

100 mm-144H-

A round nozzle of 0.4 mm, with a single-hole ejection rate of 0.56 g/min·H and a spinning temperature of 215°C, the extrusion MFR is 60 g/10 minutes (based on JIS-K7210, measured at a temperature of 230°C and a load of 2.16 kg) The polypropylene (PP) resin is drawn by air jets to draw the thread group, and a long fiber cloth sheet with an average fiber diameter of 13 μm is deposited on the conveying net (air permeability: 270 cm ³ /cm ² /sec). Use a compacting roller (surface material: HCr, pear-skin pattern) and a support roller (surface material: 90°hardness synthetic rubber) at a temperature of 140℃ to temporarily crimp the long fiber cloth sheet obtained at a contact pressure of 4.2 kgf/cm.

Secondly, the obtained long-fiber cloth sheet is passed between the smoothing roller and the embossing roller (pattern specifications: 0.425 mm diameter round, staggered arrangement, horizontal spacing 2.1 mm, vertical spacing 1.1 mm, crimping area ratio 10.6%). A temperature of 145°C and a linear pressure of 25 kgf/cm made the fibers adhere to each other to obtain a long-fiber nonwoven fabric with a basis weight of 17 g/m ² . The physical properties of the obtained long-fiber nonwoven fabric and the hot melt through-print weight are shown in Tables 1 and 2 below.

100 mm-144H-

0.4 mm之圓形噴嘴，以單孔噴出量0.56 g/min・H、紡絲溫度215℃擠出，藉由空氣噴射而牽引該線群，於輸送網(透氣度：270 cm³ /cm² /sec)上堆積平均纖維直徑13 μm之長纖維布片。使用溫度140℃之壓實輥(表面材質：HCr、梨皮花樣)與支承輥(表面材質：硬度90°合成橡膠)，以接觸壓4.2 kgf/cm暫時壓接獲得之長纖維布片。[Comparative Example 2] The glyceryl ester of octadecanoic acid (hydrogenated animal and vegetable oils) as an ester compound with a melting point of 88°C was mixed with a MFR of 60 g/10 minutes (according to JIS-K7210, Temperature 230℃, load 2.16 kg) polypropylene (PP) resin, by spunbond method,

100 mm-144H-

The 0.4 mm round nozzle extrudes with a single-hole ejection volume of 0.56 g/min·H and a spinning temperature of 215°C. The thread group is drawn by air jets and is applied to the conveying net (air permeability: 270 cm ³ /cm ² /sec) pile up long fiber cloth sheets with an average fiber diameter of 13 μm. Use a compaction roller (surface material: HCr, pear-skin pattern) and a support roller (surface material: 90°hardness synthetic rubber) at a temperature of 140℃ to temporarily crimp the long fiber cloth sheet obtained at a contact pressure of 4.2 kgf/cm.

Secondly, the obtained long-fiber cloth sheet is passed between the smoothing roller and the embossing roller (pattern specifications: 0.425 mm diameter round, staggered arrangement, horizontal spacing 2.1 mm, vertical spacing 1.1 mm, crimping area ratio 10.6%). A temperature of 145°C and a linear pressure of 25 kgf/cm made the fibers adhere to each other to obtain a long-fiber nonwoven fabric with a basis weight of 17 g/m ² . The physical properties of the obtained long-fiber nonwoven fabric and the hot melt through-print weight are shown in Tables 1 and 2 below.

[Table 1] Raw resin additive Low melting point polyolefin resin Single hole ejection volume Unit area weight Layer structure Average fiber diameter thickness species weight% weight% g/min g/m ² (-) μm mm Example 1 Polypropylene - 0 0 0.56 17 S 13.0 0.15 Example 2 Polypropylene - 0 0 0.56 13 S 13.0 0.11 Example 3 Polypropylene - 0 0 0.56 17 S 8.0 0.15 Example 4 Polypropylene - 0 0 0.56 17 S 25.0 0.16 Example 5 Polypropylene - 0 0 0.56 17 S 13.0 0.18 Example 6 Polypropylene Ester compound 1.25 0 0.56 17 S 13.0 0.14 Example 7 Polypropylene Ester compound 1.25 5 0.56 17 S 13.0 0.13 Example 8 Polypropylene Ester compound 1.25 10 0.56 17 S 13.0 0.12 Example 9 Polypropylene Ester compound 1.25 15 0.56 17 S 13.0 0.14 Example 10 Polypropylene Ester compound 1.25 20 0.56 17 S 13.0 0.15 Example 11 Polypropylene - 0 0 0.56 17 S 13.0 0.12 Example 12 Polypropylene - 0 0 0.56 17 S 13.0 0.10 Example 13 Polypropylene Erucamide 1.0 0 0.56 17 S 13.0 0.12 Example 14 Polypropylene Erucamide 1.0 10 0.56 17 S 13.0 0.13 Example 15 Polypropylene Ester compound 1.25 15 0.56 13 SMS 17.0 0.12 Example 16 Polypropylene Ester compound 1.25 15 0.56 13 SMS 17.0 0.12 Comparative example 1 Polypropylene - 0 0 0.56 17 S 13.0 0.13 Comparative example 2 Polypropylene Ester compound 1.25 0 0.56 17 S 13.0 0.13

[Table 2] Air permeability Methanol extraction volume Tensile Strength Contact area rate Fine hair Minimum unevenness ratio Apparent fiber density of recess Hot melt through print weight cm ³ /cm ² /sec g N/50 mm % level % g/cm ² mg/min Example 1 287 0.03 60 49.5 3.5 20.3 0.18 6 Example 2 571 0.02 27 48.8 3.3 18.5 0.16 13 Example 3 220 0.03 65 51.2 3.3 18.2 0.17 3 Example 4 320 0.01 55 47.5 3.5 22.1 0.20 9 Example 5 255 0.02 58 42.5 3.4 30.0 0.17 2 Example 6 263 0.10 55 49.4 3.6 17.2 0.16 8 Example 7 262 0.12 53 49.4 3.5 17.3 0.15 9 Example 8 265 0.13 51 49.6 3.6 18.0 0.15 11 Example 9 270 0.15 50 49.7 3.7 18.6 0.19 7 Example 10 268 0.20 48 50.0 3.6 18.8 0.18 10 Example 11 450 0.04 32 54.8 3.8 15.2 0.14 10 Example 12 422 0.01 38 54.3 4.0 15.5 0.14 11 Example 13 435 0.88 35 52.1 3.8 15.5 0.16 3 Example 14 430 0.95 36 51.7 3.9 15.8 0.15 5 Example 15 305 0.16 20 54.2 3.7 16.0 0.20 3 Example 16 298 0.14 twenty two 41.2 3.8 19.2 0.18 2 Comparative example 1 248 0.02 54 64.0 2.8 14.3 0.14 19 Comparative example 2 270 0.11 47 62.0 3.1 13.8 0.14 25 [Industrial availability]

The hot melt of the non-woven fabric of the present invention has less penetrating, and can maintain high process stability and productivity, so it can be better used in the surface sheet of absorbent articles used in sanitary materials with high flexibility Material, back sheet or side folds, etc.

Claims (13)

A long-fiber non-woven fabric containing thermoplastic resin, the non-woven fabric has a contact area ratio of at least one surface of 30% to 60%, and the ratio of the minimum unevenness to the thickness of the non-woven fabric is 15% to 50%. Such as the long-fiber non-woven fabric of claim 1, which has a thermal compression joint. The long-fiber non-woven fabric of claim 1 or 2, wherein the apparent density of the recesses on the surface of the long-fiber non-woven fabric other than the hot-compression bonding portion is 0.01 g/cm ³ or more and 0.25 g/cm ³ or less. For example, the long-fiber non-woven fabric of claim 1 or 2 has a basis weight of 8 g/m ² or more and 50 g/m ² or less. The long-fiber nonwoven fabric of claim 1 or 2, wherein the average fiber diameter of the long fibers constituting the long-fiber nonwoven fabric is 1 μm or more and 25 μm or less. For example, the long-fiber non-woven fabric of claim 1 or 2 has an air permeability of 50 cm ³ /cm ² /sec or more and 1000 cm ³ /cm ² /sec or less. For example, the long-fiber non-woven fabric of claim 1 or 2 has a tensile strength of 10N/50mm or more and 180N/50mm or less. The long-fiber nonwoven fabric according to claim 1 or 2, wherein the long fibers constituting the long-fiber nonwoven fabric are polyolefin-based fibers. The long-fiber nonwoven fabric of claim 8, wherein the polyolefin-based fiber is a polypropylene-based fiber. The long-fiber nonwoven fabric according to claim 8, wherein 0.3% by weight or more and 5% by weight or less, relative to the weight of the long fibers constituting the long-fiber nonwoven fabric, contains an ester compound having a melting point of 70°C or more as a softening agent. The long-fiber non-woven fabric of claim 8, which contains a polyolefin resin with an MFR of 70 g/10 min or less and a melting point of 120° C. or less at 5 wt% or more and 30 wt% or less relative to the weight of the long fibers constituting the long fiber non-woven fabric. . A sanitary material comprising the long-fiber nonwoven fabric according to any one of claims 1 to 11. Such as the sanitary material of claim 12, which has the form of disposable diapers, sanitary napkins or incontinence pads.