TW201323676A - Permeable nonwoven fabric - Google Patents

Abstract

The objective of this invention is to provide a permeable nonwoven fabric imparted with uniform permeability for smoothly absorbing urine, bodily fluids, and the like. This permeable nonwoven fabric is characterized in comprising a polyolefin thermoplastic fiber, the average value and CV value of the permeable flow length value at a 45 DEG inclination in the MD direction of the nonwoven fabric being respectively no more than 90 mm and no more than 5.0, and the R value of the second-time permeability durability index being no more than 60%.

Description

Water permeable non-woven fabric

The present invention relates to a polyolefin-based water-permeable nonwoven fabric, and more particularly to a water-permeable nonwoven fabric which uniformly imparts water permeability for smoothly absorbing urine or body fluids when used for a surface material such as a sanitary material.

The polyolefin-based nonwoven fabric is used as a sanitary material such as disposable diapers and menstrual sanitary napkins or wet wipes in terms of the material properties, for example, the part that is in contact with the skin has no moist feeling and the touch is comfortable. In addition, since it is excellent in chemical resistance, it is used for industrial materials such as filters, wipes, and battery separators, and various applications for water permeability are required. Since the polyolefin-based nonwoven fabric is hydrophobic, in order to be used for applications requiring water permeability, water permeability is imparted by a water-permeable agent such as a surfactant to impart water permeability.

Examples of the water permeable treatment method for the nonwoven fabric include a immersion method in which a non-woven fabric is immersed in a water permeable agent, a spray method for a non-woven fabric spray water permeable agent, and a gravure method in which a gravure roll is applied.

The polyolefin-based nonwoven fabric is originally hydrophobic. Therefore, when the water-permeable agent such as a surfactant is diluted with water to perform water permeable treatment, uneven adhesion of the water-permeable agent is likely to occur on the surface of the nonwoven fabric, and the following is also the case: a part is water-repellent. Or a part with too much water permeable agent. Therefore, the adhesion unevenness of the water permeable agent is also reduced by increasing the dilution ratio of the treatment liquid and applying a large amount of the treatment liquid to the nonwoven fabric.

However, if a large amount of the treatment liquid is applied, it is easy to cause electron migration during drying in the drying step after coating, and it is easy to cause adhesion of the water permeable agent. Uneven, or exceeds drying capacity and even dryness.

In the following Patent Document 1, a slit coating method, a spray method, and a contact coating method in which the water-permeable agent component is reliably adhered to one nonwoven fabric is removed. There is no specific description of the coating conditions. Further, in recent years, as the production amount of the nonwoven fabric is expanded, it is necessary to increase the speed of the equipment, and it is difficult to achieve uniformity of the water permeability of the nonwoven fabric under the influence of uneven adhesion or insufficient drying of the water-permeable agent.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2007-531830

An object of the present invention is to solve the above problems and to provide a water-permeable non-woven fabric which uniformly imparts water permeability which smoothly absorbs urine or body fluids.

In order to achieve the above object, the inventors of the present invention conducted a plurality of studies and found that the average value of the permeated 45° inclined flow length value and the CV value and the R value of the second water permeability endurance index are not more than a fixed value. The above object is achieved to complete the present invention.

That is, the present invention is as follows.

(1) A water-permeable non-woven fabric comprising: a non-woven fabric of a polyolefin-based thermoplastic fiber, and an average of a 45° slanted flow length value in a MD (Machine Direction) direction of the nonwoven fabric The value and the CV value are respectively 90 mm or less and 5.0 or less, and the R value of the second water permeability endurance index is 60% or less.

(2) The water-permeable non-woven fabric according to the above (1), wherein the average value and the CV value of the 45° oblique flow length value in the CD (Cross Direction) direction of the non-woven fabric are respectively 90 mm or less and 5.0 or less, and the second The R value of the sub-permeable durability index is 60% or less.

(3) The water-permeable non-woven fabric according to (1) or (2) above, wherein the non-woven fabric is a non-woven fabric roll having a diameter of 30 cm or more, and the difference in water permeability between the inner and outer layers is 45° in the MD direction and the CD direction. The difference between the average values of the inclined flow length values is within ±5 mm, and the difference between the average values of the second water permeability endurance indices is within ±20%.

(4) The water-permeable non-woven fabric according to any one of (1) to (3) above, wherein the non-woven fabric has a moisture regain index of 2.5 g or less.

(5) The water-permeable nonwoven fabric according to any one of (1) to (4) above, wherein the polyolefin-based thermoplastic fiber has an average single yarn fineness of 0.5 dtex or more and 3.5 dtex or less.

(6) The water-permeable nonwoven fabric according to any one of (1) to (5) above, wherein the polyolefin-based thermoplastic fiber comprises a polypropylene-based thermoplastic fiber.

(7) The water-permeable nonwoven fabric according to any one of (1) to (6) above, wherein the non-woven fabric comprises a long-fiber nonwoven fabric.

(8) A disposable sanitary material obtained by using the non-woven fabric according to any one of (1) to (7).

(9) A disposable sanitary material according to (8) above, which is in the form of a disposable diaper, a menstrual sanitary napkin or an incontinence pad.

According to the present invention, it is possible to provide a water-permeable non-woven fabric which uniformly imparts necessary water permeability to a surface material such as a sanitary material or the like.

The invention is described in detail below.

In the nonwoven fabric comprising the polyolefin-based thermoplastic fiber of the present invention, a long-fiber nonwoven fabric produced by a spunbonding method, a non-woven fabric produced by a melt blow method, and a carding method or a wet type using short fibers can be used. Non-woven fabric manufactured by papermaking method, etc.

In terms of strength and productivity, a long-fiber nonwoven fabric produced by a spunbonding method is preferably used, for example, by forming a web of a melt-spun continuous yarn by a spunbonding method and joining it. The cotton web is formed. Further, a laminated cotton web formed by melt-spinning the cotton web by the melt-blown method (M) may be sprayed on the cotton web formed by the spunbonding method (S). The state of the layer is in terms of productivity, and the stackable layer is SS, SSS, SSSS, or may be laminated by means of SM, SMS, SMMS, SMSMS. Further, each layer may be formed in different deniers, or a special form of fibers such as a cross-section fiber, a crimped fiber, or a hollow fiber may be laminated. In the joining of the cotton webs, it is possible to carry out the following methods: bonding using a low-melting fiber or a composite fiber by using an adhesive bonding, spraying a hot-melt adhesive in a cotton web to perform fusion bonding, or needle rolling or water flow. Such as symmetry fibers. However, in terms of high-speed productivity, it is preferable to perform bonding by partial thermocompression bonding, for example, the cotton web can be passed through a joint point which can impart a needle dot shape, an elliptical shape, a diamond shape, a rectangular shape, or the like. Heated embossing/smooth roller Hehe. In terms of strength retention and flexibility, the area of the thermocompression bonding area in the partial thermocompression bonding is preferably from 5 to 40%, more preferably from 5 to 25%.

Examples of the polyolefin-based thermoplastic fiber used in the present invention include polyethylene fibers, polypropylene fibers, and fibers containing a resin such as ethylene or a copolymer of propylene and another α-olefin.

The polypropylene may be a polymer which is usually synthesized by using a Ziegler-Natta catalyst, or may be a polymer synthesized by using a single-site active catalyst represented by a metallocene. The other α-olefin is a carbon number of 3 to 10, and specific examples thereof include propylene, 1-butene, 1-pentene, 1-hexane, 4-methyl-1-pentene, and 1-octyl Alkene and the like. These may be used alone or in combination of two or more. In the case of forming a composite fiber, it may be a core sheath, a side by side, a cut fiber or a mixed fiber. Further, the fiber shape is not only a normal circular cross-section fiber, but also a special-shaped fiber such as a profiled cross-section fiber, a crimped fiber, or a hollow fiber.

Further, a nucleating agent, a flame retardant, an inorganic filler, a pigment, a colorant, a heat stabilizer, an antistatic agent, or the like may be blended in the thermoplastic fiber.

Further, the average single yarn fineness of the fibers constituting the nonwoven fabric is preferably 0.5 dtex or more and 3.5 dtex or less, and more preferably 0.7 dtex or more and 3.0 dtex or less. More preferably, it is preferably 0.5 dtex or more from the viewpoint of spinning stability, and is 3.5 dtex or less from the viewpoint of texture or strength of the nonwoven fabric.

In the present invention, the basis weight of the nonwoven fabric is preferably from 8 to 80 g/m ² , more preferably from 10 to 50 g/m ² , still more preferably from 10 to 30 g/m ² . When the basis weight is in the above range, the strength is sufficient and the perforations of the non-woven fabric are appropriate. When used as a surface material of a sanitary material such as a disposable diaper, the pulp fibers or the polymer absorbent body inside the absorbent body are less likely to fall off. . Moreover, the rigidity of the non-woven fabric is also appropriate and the texture is good.

The water-permeable non-woven fabric of the present invention has the following characteristics in order to smoothly absorb urine or body fluids and the like.

The average value of the 45° inclined flow length value in the MD direction of the non-woven fabric is 90 mm or less, preferably 50 mm or less, and further preferably 35 mm or less. Further, the CV value is 5.0 or less, preferably 3.5 or less. The method for measuring the turbulent 45° inclined flow length value is as follows.

Further, the R value of the second water permeability endurance index in the MD direction is 60% or less, preferably 40% or less, and more preferably 20% or less. The method for measuring the R value of the second water permeability endurance index is also as follows.

The CD direction of the non-woven fabric is also the same as described above, and the average value of the permeable flow length value of the permeable 45° is preferably 90 mm or less, more preferably 50 mm or less, and still more preferably 35 mm or less. Further, the CV value thereof is preferably 5.0 or less, more preferably 3.5 or less.

Further, the R value of the second water permeability endurance index in the CD direction is also preferably 60% or less, more preferably 40% or less, still more preferably 20% or less.

Further, as a difference in water permeability between the inner and outer layers when the non-woven fabric is a non-woven fabric roll having a diameter of 30 cm or more, the difference between the average values of the permeable flow length values of the water-permeable 45° in the MD direction and the CD direction is preferably Within ±5 mm, the difference between the average values of the second permeable endurance index is preferably within ±20%.

The non-woven fabric roller is a non-woven fabric which is taken into a roll shape by a coiler using a paper tube or the like as a core roll, and can be cut into an arbitrary width or not. Further, from the viewpoint of a long roll, it is preferable that the roll diameter is usually 30 cm or more.

The inner layer and the outer layer of the non-woven fabric roll are set to have an inner layer of 10% or less of the paper tube side obtained by subtracting the distance of the non-woven fabric roll from the paper tube radius, and the innermost layer of the non-woven fabric roll is set to be the outer layer within 10%. The non-woven fabric roll was cut, and the difference in the water permeability of the non-woven fabric taken from the positions in the above ranges was defined as the difference in the water permeability of the inner and outer layers of the roll.

Even when it is used as a surface material of a sanitary material such as a disposable diaper, even when the liquid permeability is excellent, if the nonwoven fabric is wet, it is likely to lose the comfort to the skin and cause a rash or the like. In order to prevent rash or the like, the moisture repellent index of the non-woven fabric is preferably 2.5 g or less, more preferably 2.0 g or less, and further preferably 1.6 g or less. The method for measuring the rewetting index is as follows.

The above characteristic values of the non-woven fabric can be adjusted by the permeable treatment conditions of the non-woven fabric. It is particularly important to adjust the viscosity and the temperature of the permeable treatment liquid according to the intended use, and appropriately select the viscosity of the permeable treatment liquid.

As the water-permeable agent applied to the nonwoven fabric, it is preferable to use non-ionic addition of ethylene oxide to a higher alcohol, a higher fatty acid, or an alkylphenol, in consideration of safety to human body and safety in the step. The surfactant is a single or a mixture of an anionic surfactant such as an alkyl phosphate or an alkyl sulfate. For example, a polyether compound, a polyvinyl ether-modified polyfluorene oxide, a polyether-modified polysiloxane, a polyester compound, a polyamine compound, a polyglycerin compound, or the like is preferably used.

Further, the amount of the water-permeable agent to be applied differs depending on the intended use. For example, it is preferably used as a sanitary material, and is usually in the range of 0.1% by weight or more and 1.0% by weight or less, more preferably 0.2% by weight or more and 0.6% by weight or less based on the fiber. .

The water permeable agent may also be diluted with a solvent such as water and applied as an aqueous solution. The temperature of the solution of the applied water-permeable agent is preferably from 12 ° C to 50 ° C, and more preferably from 15 ° C to 35 ° C in terms of uniform dispersion or foaming of the solution. Further, as the viscosity of the solution, it is preferably 0.50 mPa. s above 50 mPa. Below s, it is more preferably 0.8 mPa in terms of easy and more uniform coating. s above 20 mPa. s below. If it does not reach 0.50 mPa. s, the measurement of the non-woven fabric is reduced, and if it exceeds 50 mPa. s, the impregnation of the non-woven fabric by the permeable aqueous solution is poor, and it is difficult to perform uniform coating.

As a method of applying the water permeable agent, an existing method such as a coating method (gravure coating, kiss coating) or a spray method may be employed, and a corona discharge treatment and a normal piezoelectric discharge treatment may be employed as needed. deal with. As a drying method after coating, a known method using convection heat transfer, conduction heat transfer, and radiation heat transfer can be used, and drying by hot air or infrared rays or drying by thermal contact can be used.

In order not to cause insufficient drying or the like in the drying step accompanying the increase in speed of the apparatus, it is preferred that the amount of the water permeable solution applied is small. The coating amount (wt%) for the nonwoven fabric is preferably 1.0 wt% or more and 65 wt% or less, more preferably 3.0 wt% or more and 60 wt% or less, and still more preferably 5.0 wt% or more and 50 wt%. %the following.

In particular, in the coating by the gravure coater, the pattern of the gravure roll may be a lattice type or a pyramid type, and it is preferable that the water permeable agent is difficult to be left at the bottom of the cell of the intaglio plate. The cell volume is also preferably 5 cm ³ /m ² or more and 40 cm ³ /m ² or less, and more preferably 10 cm ³ /m ² or more and 30 cm ³ /m ² or less. If it is less than 5 cm ³ /m ² , the coating amount is too small, and it is difficult to apply uniform coating. If it exceeds 40 cm ³ /m ² , the coating amount is too large to cause insufficient drying in the drying step or due to electron migration. The problem of uneven adhesion of the permeable agent.

Preferably, the depth of the cells of the intaglio plate is 10 μm or more and 80 μm or less, and the interval is 80 mesh or more and 250 mesh or less, and is designed to be the cell volume.

Further, the blade for scraping the liquid of the surface of the intaglio plate may be a blade method using a doctor blade made of a usual hardened steel plate or a rubber roller method using a roll made of a surface rubber. In terms of durability, it is more preferable to be a rubber roller. The pressing pressure in the case of the doctor blade method is preferably 0.5 kg/cm or more and 1.0 kg/cm or less, more preferably 0.6 kg/cm or more and 0.8 kg/cm or less. In the case of the rubber roller method, in the range of the rubber hardness of 60° or more and 80° or less, the pressing pressure is preferably 1.0 kg/cm or more and 5.0 kg/cm or less, more preferably 1.5 kg/cm or more and 3.5 kg/cm or less. If the pressing pressure in any of the above ranges is within the above range, it is easy to uniformly press in the CD direction, and the unevenness of the coating amount is small. If the pressing pressure is too low, the coating tends to be uneven, and if it is too high, the knife is easily worn and the durability is lacking.

The water-permeable non-woven fabric of the present invention uniformly imparts water permeability, in particular, in sanitary materials such as disposable diapers, menstrual sanitary napkins and incontinence pads, as surface materials, it is possible to suppress leakage of urine or macule due to uneven water permeability. It can also be used as a cover for covering the absorber. In addition, in other applications where the water permeable function is required, it can also be used, for example, in wiping products, medical robes, and skin care masks. use.

[Examples]

Hereinafter, the present invention will be specifically described by way of examples and comparative examples, but the present invention is not limited to the following examples. Furthermore, the evaluation method of each characteristic is as follows.

1. Average single yarn fineness (dtex)

For the measurement of the non-woven fabric in the CD direction, five places were formed at substantially equal intervals, and a 1 cm square non-woven fabric was cut out at each place, and the diameter of the fiber of each 20-point non-woven surface layer was measured for each sample using a microscope, according to the average thereof. The value is calculated as the single yarn fineness.

2. permeable water in the direction of MD and CD 45° inclined flow length (mm)

Ten sheets of toilet paper were placed on the 45° inclined plate as an absorbent body, and a test cloth (20 cm square) was placed thereon and adjusted, and 0.1 cc of physiological saline was dripped from the height of 10 mm above the cloth. The distance from the physiological saline solution from the dropping position to the end of the absorption was read, and the permeable flow length value (mm) was 45°. The measurement was carried out at any 5 points in the test cloth. In the case of the MD direction, 10 test cloths were taken at intervals of 30 cm in the MD direction, and the above measurement was performed to obtain an average value and a CV value (CV value = (standard deviation value / average value) × 100). Further, in the case of the CD direction, 10 test cloths were taken at equal intervals in the width of the non-woven fabric in the CD direction, and the measurement was performed in the same manner, and the average value and the CV value were determined.

3. The second permeable endurance index in the MD and CD directions (%)

10 sheets of toilet paper were placed as an absorbent body, and a test cloth (20 cm × 30 cm) was placed thereon. And then placed on it at equal intervals, there are 10 diameters of 1.5 The stainless steel plate of the hole of cm was dropped with 0.3 cc of physiological saline from a height of 10 mm above the cloth of each hole, and after 3 minutes, it was again dropped in the same manner. After the second dropwise addition, the number (A) of the absorbed pores within 10 seconds was calculated, and [((A)/10) × 100] was set as the second water permeability endurance index (%). In the case of the MD direction, the test cloth was taken from 10 points at intervals of 30 cm in the MD direction, and the above measurement was performed to obtain an average value and an R value. Furthermore, the R value is the difference between the maximum value and the minimum value of the measured value. Similarly, in the case of the CD direction, the test cloth was taken from 10 places in the CD direction at equal intervals in the width of the nonwoven fabric, and the above measurement was performed to obtain the average value and the R value.

4. Rewetting index (g)

As the absorber, in order to fix the characteristics of the absorber, a test cloth (10 cm square) was placed on a specific filter paper ("ERT-FE3" manufactured by HOLLING SWORTH & VOSE. COMPANY, 10 cm square × overlap 5 sheets). Further, a plate (about 800 g) having a hole of 10 cm square and having a diameter of 25 mm was placed thereon, and physiological saline was dripped from the height of 25 mm above the center hole cloth (3.5 times the weight of the absorbent body) The amount of liquid) is absorbed. Then, the plate on the test cloth was removed, and a hammer of 3.6 kg (10 cm square) was slowly placed for 3 minutes to fix the distribution of the liquid in the absorber. Then, temporarily remove the hammer of 3.6 kg, and quickly place the pre-weighed measurement filter paper ("ERT-MED" manufactured by HOLLINGSWORTH & VOSE.COMPANY 12.5 cm square × 2 sheets) on the test cloth, and slowly load 3.6 again. Kg hammer. After 2 minutes, the weight of the filter paper for the measurement was weighed. The value (g) of the added portion is set as the wetness index. From 10 in the MD direction at 30 cm intervals, on CD A total of 20 test cloths were extracted from 10 points at equal intervals in the width of the non-woven fabric in the direction, and the above measurement was performed to obtain the average value of the above.

5. The difference between the water permeability of the inner and outer layers of the roller

The inner layer and the outer layer of the non-woven fabric roll are set to have an inner layer of 10% or less of the paper tube side obtained by subtracting the distance of the non-woven fabric roll from the paper tube radius, and the innermost layer of the non-woven fabric roll is set to be the outer layer within 10%. The non-woven fabric roll was cut, and the measurement described in the above 2 to 4 was carried out at the positions in the above respective ranges to determine the difference in the water permeability of the inner and outer layers of the roll.

6. Permeable agent purity adhesion amount (wt%)

Measuring the weight (W1) of the non-woven fabric sample to which the water permeable agent was attached by adjusting the temperature and humidity of 25 ° C × 40% RH (Relative Humidity) for 24 hours, and performing Soxhlet extraction from the nonwoven fabric sample using methanol The weight (W2) of the water-permeable agent was determined by the following formula to determine the water-permeable agent purity adhesion amount C (wt%).

C(wt%)=[W2/W1]×100

The sample of the non-woven fabric sample was taken from 10 places at intervals of 30 cm in the MD direction at equal intervals in the CD direction from the width of the non-woven fabric at intervals of 5 cm to 10 cm, and the non-woven sample became approximately Cut the length of 2 g, and extract a total of 20 test cloths. The above measurement was carried out, and the average value of these was determined as the water-permeable agent purity adhesion amount (wt%).

7. Coating amount of water permeable solution (wt%)

The value calculated by the following formula according to the amount of permeated liquid consumed by the water permeation treatment for 1 hour was taken as the coating amount (wt%) of the water permeating agent solution.

Coating amount (wt%) = {permeable liquid consumption (g) / [non-woven basis weight (g / m ² ) × width (m) × processing speed (m / min) × 60 (min)]} × 100

<Manufacture of non-woven fabrics (A)>

A polypropylene resin (density 0.91 g/cm ³ , JIS-K7210, MFR 60 measured under the conditions of Table 1) was quantitatively extruded at 2000 ° C/min at a pressing temperature of 230 ° C, and a spinning group was used to spun the silk group. The high-speed air traction device was used to pull it at a spinning speed of 3000 m/min, and the cotton web was formed on the moving conveyor web. Then, in the conveyance of the obtained cotton web, the cotton web obtained in the same manner as described above is laminated, and another layer of the same cotton web is laminated to form a cotton web in the form of SSS. The laminated cotton web was conveyed, and a partial pressure bonding was performed at a temperature of 135 ° C at a temperature of 135 ° C and a pressure of 60 kg / cm to obtain a weight per unit area of 18 g / by a thermocompression bonding roll formed by combining an engraving roll and a smooth roll. The line speed was adjusted by m ^{2 to} obtain a spunbonded nonwoven fabric with a single yarn fineness of 2.8 dtex.

<Manufacture of non-woven fabrics (B)>

For the sheath component, a high-density polyethylene (density 0.96 g/cm ³ ) having a melting point of 130 ° C was used, and a polypropylene having a melting point of 165 ° C (density of 0.91 g/cm ³ ) was used for the core component, and each of the two extruders was used. The extrusion temperature was quantitatively extruded at 2000 ° C/min at 220 ° C, and spun using a spinning head to become a sheath core group (sheath core ratio = 50/50), using a high-speed air flow pulling device at 3000 m/min. The spinning speed draws it and is subjected to a moving web to form a cotton web. The cotton web is conveyed, and a partial pressure bonding is performed at a temperature of 120 ° C and a pressure of 50 kg/cm at a temperature of 120 ° C at a temperature of 120 ° C to obtain a basis weight of 20 g/m. ^In the way of ^2, the linear velocity is adjusted to obtain a spunbonded non-woven fabric with a single yarn fineness of 2.8 dtex. Further, when the single yarn fineness was calculated, the sheath core yarn had a density of 0.94 g/cm ³ .

<Manufacture of non-woven fabric (C)>

A polypropylene resin (density 0.91 g/cm ³ , JIS-K7210, MFR 60 measured under the conditions of Table 1) was quantitatively extruded at 2000 ° C/min at a pressing temperature of 230 ° C, and a spinning group was used to spun the silk group. The high-speed air traction device was used to pull it at a spinning speed of 3000 m/min, and the cotton web was formed on the moving conveyor web. Then, on the obtained cotton web, the polypropylene resin (MFR900) was quantitatively extruded at 250 g/min at an extrusion temperature of 280 ° C, and the filament group was spun using a spinning head at a temperature of 270 ° C from the vicinity of the nozzle. The hot air is melt-sprayed, and a melt-blown cotton web is laminated. Further, the web obtained by laminating in the same manner as the first layer forms a web in the form of SMS. The laminated cotton web was conveyed, and a partial pressure bonding was performed at a temperature of 135 ° C at a temperature of 135 ° C and a pressure of 60 kg / cm to obtain a weight per unit area of 10 g / by using a heat-bonding roll formed by combining an engraving roll and a smooth roll. The line speed was adjusted by m ^{2 to} obtain a non-woven fabric with a single yarn fineness of 1.8 dtex. Furthermore, the single yarn fineness is the single yarn fineness of the S layer.

[Example 1]

For the non-woven fabric obtained in the manufacture of non-woven fabric (A), a 1 wt% aqueous solution of a water-permeable agent comprising a mixture of a polyether compound and a polyvinyl ether-modified polyfluorene oxide is adjusted to a liquid temperature of 20 ° C and a liquid viscosity of 2.3 mPa. s and coated with a slanting pattern 120 mesh and a gravure roll having a cell volume of 22 cm ³ /m ² in a manner of a coating amount of 30 wt%, followed by drying and winding by a drum dryer at 120 ° C . The take-up is performed by taking a paper tube as a core for long winding. Further, the polyether compound used and the polyether modified polyoxymethylene system were obtained by the following methods.

The polyether compound reacts propylene oxide with glycerol to obtain an average degree of polymerization. 50 adducts. Then, ethylene oxide and the obtained adduct are subjected to addition polymerization in such a manner as to have an average polymerization degree of 15. The stearic acid is reacted therewith to obtain a polyether compound.

The polyether modified polyfluorene-based dimethyl hydroxy polyoxyalkylene is added to the ethylene oxide reactant of methanol to obtain a repeat number (Si) of hafnium oxide of 22, and ethylene oxide addition to decane. The number of repetitions (SiE) is 2, and the polyethylene ether modified polyoxane having an ethylene oxide repeat number (EO) of 40.

The obtained water-permeable non-woven fabric was insufficiently dried, and the average value and CV value of the 45° inclined flow length value in the MD direction were 21 mm and 2.8, respectively, and the R value of the second water permeability endurance index was 0%. The various measurement results of the obtained water-permeable non-woven fabric are shown in Table 1.

[Embodiment 2]

In the production (A) of the nonwoven fabric, the linear velocity was adjusted so as to have a basis weight of 15 g/m ² , and otherwise, the nonwoven fabric was obtained in the same manner. A water-permeable non-woven fabric was obtained by imparting a water-permeable agent to the obtained non-woven fabric in the same manner as in Example 1. The various measurement results of the obtained water-permeable non-woven fabric are shown in Table 1.

[Example 3]

In the production (A) of the nonwoven fabric, the linear velocity was adjusted so as to have a basis weight of 10 g/m ² , and otherwise, the nonwoven fabric was obtained in the same manner. A water-permeable non-woven fabric was obtained by imparting a water-permeable agent to the obtained non-woven fabric in the same manner as in Example 1. The various measurement results of the obtained water-permeable non-woven fabric are shown in Table 1.

[Example 4]

In the production of non-woven fabric (A), the spinning speed was adjusted so that the fineness was 2.0 dtex, and otherwise, the non-woven fabric was obtained in the same manner, and the obtained non-woven fabric was discharged at a volume of 45 W. After corona discharge treatment under the condition of min/m ² (discharge degree 4.0 W/cm ² ), hexaglycerol monostearate, polyether modified polyoxyl oxide and polyoxyalkylene ricinoleate are contained. The 1 wt% aqueous solution of the mixture is adjusted to a liquid temperature of 20 ° C and a liquid viscosity of 2.3 mPa. In the same manner as in Example 1, a water-permeable non-woven fabric was obtained in the same manner as in Example 1 except that the coating amount was 30% by weight.

Further, the water permeable agent used was a mixture comprising 40% by weight of hexaglyceryl monostearate, 45% by weight of polyether modified polysiloxane, and 15% by weight of polyoxyalkylene ricinoleate.

The various measurement results of the obtained water-permeable non-woven fabric are shown in Table 1.

[Example 5]

In the production of the non-woven fabric (A), the basis weight is 15 g/m ² and the fineness is 1.1 dtex, and the extrusion amount per layer is set to 1800 g/min to adjust the spinning speed. Non-woven fabrics are obtained in the same manner. A water-permeable non-woven fabric was obtained by imparting a water-permeable agent to the obtained non-woven fabric in the same manner as in Example 1. The various measurement results of the obtained water-permeable non-woven fabric are shown in Table 1.

[Embodiment 6]

A water-permeable nonwoven fabric was obtained in the same manner as in Example 1 except that the coating amount was 20 wt%, and a gravure roll having a mesh size of 100 mesh and a cell volume of 17 cm ³ /m ² was used. The various measurement results of the obtained water-permeable non-woven fabric are shown in Table 1.

[Embodiment 7]

A water-permeable nonwoven fabric was obtained in the same manner as in Example 1 except that the coating amount was 50% by weight, and the coating was performed using a slanting pattern 160 mesh and a gravure roll having a cell volume of 25 cm ³ /m ² . The various measurement results of the obtained water-permeable non-woven fabric are shown in Table 1.

[Embodiment 8]

The aqueous permeable agent solution was set to 2 wt% and adjusted to a liquid temperature of 25 ° C and a liquid viscosity of 5.3 mPa. A water-permeable nonwoven fabric was obtained in the same manner as in Example 1 except that the coating amount was 40% by weight. The various measurement results of the obtained water-permeable non-woven fabric are shown in Table 1.

[Embodiment 9]

The aqueous permeable agent solution was set to 5 wt% and adjusted to a liquid temperature of 15 ° C and a liquid viscosity of 26 mPa. A water-permeable nonwoven fabric was obtained in the same manner as in Example 1 except that the coating amount was 10% by weight. The various measurement results of the obtained water-permeable non-woven fabric are shown in Table 1.

[Embodiment 10]

In the production of nonwoven fabric (A), an ethylene-propylene random copolymer resin (density 0.91 g/cm ³ , MFR24 of JIS-K7210 measured under the conditions of Table 1) having an ethylene component content of 4.3 mol% was used instead of poly. A non-woven fabric was obtained in the same manner except for the acrylic resin. For the obtained non-woven fabric, the aqueous solution of the water-permeable agent was set to 1 wt% and adjusted to a liquid temperature of 30 ° C and a liquid viscosity of 8.0 mPa. A water-permeable nonwoven fabric was obtained in the same manner as in Example 1 except that the coating amount was 30% by weight. The various measurement results of the obtained water-permeable non-woven fabric are shown in Table 1.

[Example 11]

For the non-woven fabric obtained in the manufacture of non-woven fabric (B), the water-permeable agent aqueous solution was set to 1 wt% and adjusted to a liquid temperature of 30 ° C and a liquid viscosity of 8.0 mPa. A water-permeable nonwoven fabric was obtained in the same manner as in Example 1 except that the coating amount was 30% by weight. The various measurement results of the obtained water-permeable non-woven fabric are shown in Table 1.

[Embodiment 12]

A water-permeable nonwoven fabric was obtained in the same manner as in Example 1 for the nonwoven fabric obtained in the production of the nonwoven fabric (C). The various measurement results of the obtained water-permeable non-woven fabric are shown in Table 1.

[Example 13]

For the non-woven fabric obtained in the manufacture of non-woven fabric (C), a 3 wt% aqueous solution of a water-permeable agent comprising a mixture of a polyether compound and a polyvinyl ether-modified polyfluorene oxide is adjusted to a liquid temperature of 20 ° C and a liquid viscosity of 10 mPa. s, coating was applied while being applied by contact coating and adjusting the angle between the stainless steel applicator rolls so that the coating amount was 10 wt%. Then, it was dried and taken up by a drum dryer at 120 °C. The take-up is performed by taking a paper tube as a core for long winding. Further, the polyether compound to be used and the polyvinyl ether-modified polyfluorene oxide were used in the same manner as in Example 1. The various measurement results of the obtained water-permeable non-woven fabric are shown in Table 1.

[Comparative Example 1]

For the non-woven fabric obtained in the manufacture of non-woven fabric (A), a 3 wt% aqueous solution of a water-permeable agent comprising a mixture of a polyether compound and a polyvinyl ether-modified polyfluorene oxide is adjusted to a liquid temperature of 30 ° C and a liquid viscosity of 1.7 mPa. Dip coating machine After coating, the coating amount was 50 wt%, sandwiched and adjusted by a pair of rubber nip rolls, and then dried and wound up by a drum dryer at 120 °C. The take-up is performed by taking a paper tube as a core for long winding. Further, the polyether compound to be used and the polyvinyl ether-modified polyfluorene oxide were used in the same manner as in Example 1.

The average value of the permeated 45° inclined flow length value in the MD direction of the obtained water-permeable nonwoven fabric was 20 mm, and the CV value was 6.3, and the unevenness of the measured values was large. Further, the second water permeability endurance index in the MD direction is 50%, and the difference between the average values of the inner and outer layers of the roll is 50%. The various measurement results of the obtained water-permeable non-woven fabric are shown in Table 1.

[Comparative Example 2]

A water-permeable nonwoven fabric was obtained in the same manner as in Example 1 except that the coating amount was 70 wt%, and the coating was performed using a slanting pattern 150 mesh and a gravure roll having a cell volume of 42 cm ³ /m ² . The obtained water-permeable non-woven layout portion has moisture. Further, the average value and the CV value of the 45° inclined flow length value in the MD direction were 23 mm and 5.3, respectively, and the difference between the average values of the inner and outer layers of the roller was also -7 mm, and the unevenness of the measured values was large. The second permeable endurance index has an R value of 20% and a rewetting index of 2.60 g. The various measurement results of the obtained water-permeable non-woven fabric are shown in Table 1.

[Comparative Example 3]

The aqueous permeable agent solution was set to 5 wt% and adjusted to a liquid temperature of 15 ° C and a liquid viscosity of 55 mPa. s, a water-permeable nonwoven fabric was obtained in the same manner as in Example 1 except that the coating amount was 15 wt%. The obtained non-woven fabric is the average value of the 45° sloping flow length value in the MD direction and the CV The values are 22 mm and 6.5, respectively, and the variation of the measured values is large. The difference between the average values of the inner and outer layers of the roll was -3 mm, and the second water permeability endurance index was 40% R and the moisture regain index was 2.09 g. The various measurement results of the obtained water-permeable non-woven fabric are shown in Table 1.

The following can be seen from Table 1.

It is understood that the water-permeable non-woven fabric of the present invention uniformly imparts water permeability to the surface material in the MD direction and the CD direction. Especially in the use of disposable diapers, menstrual sanitary napkins, incontinence pads and other sanitary materials, it can suppress leakage of urine or rash caused by uneven water permeability.

[Industrial availability]

The water-permeable non-woven fabric of the present invention is of course suitable for use in sanitary materials, and can be widely used in other applications where water permeable function is required, such as wiping products, medical robes, skin care masks and the like.

Claims (9)

A water-permeable non-woven fabric comprising: a non-woven fabric of a polyolefin-based thermoplastic fiber, wherein an average value and a CV value of a water-permeable 45° inclined flow length value in the MD direction of the nonwoven fabric are 90 mm or less and 5.0 or less, respectively. The R value of the second water permeability endurance index is 60% or less. The water-permeable non-woven fabric of claim 1, wherein the average value and the CV value of the 45° inclined flow length value in the CD direction of the non-woven fabric are respectively 90 mm or less and 5.0 or less, and the R value of the second water permeability endurance index is 60%. the following. The water-permeable non-woven fabric of claim 1 or 2, wherein the non-woven fabric comprises a non-woven fabric roll having a diameter of 30 cm or more, as the difference in the water permeability of the inner and outer layers, and the average of the turbulent flow length values in the MD direction and the CD direction. The difference between the values is within ±5 mm, and the difference between the average values of the second permeable endurance index is within ±20%. The water-permeable non-woven fabric according to any one of claims 1 to 3, wherein the non-woven fabric has a moisture regain index of 2.5 g or less. The water-permeable non-woven fabric according to any one of claims 1 to 4, wherein the polyolefin-based thermoplastic fiber has an average single yarn fineness of 0.5 dtex or more and 3.5 dtex or less. The water-permeable non-woven fabric according to any one of claims 1 to 5, wherein the polyolefin-based thermoplastic fiber is a polypropylene-based thermoplastic fiber. A water-permeable nonwoven fabric according to any one of claims 1 to 6, wherein the non-woven fabric comprises a long-fiber nonwoven fabric. A disposable sanitary material obtained by using a non-woven fabric according to any one of claims 1 to 7. A disposable sanitary material according to claim 8 which is in the form of a disposable diaper, a menstrual sanitary napkin or an incontinence pad.