JP2019097931A - Nonwoven fabric - Google Patents

Abstract

To achieve simultaneously expression of a function of a contained functional agent, and improvement of skin touch.SOLUTION: In a nonwoven fabric, a functional agent exists in a larger amount in the inside than the uppermost surface, and the functional agent has properties enabling scattering at least in a thickness direction due to passage of liquid. An absorbent article using the nonwoven fabric on a front face is provided. A manufacturing method of the nonwoven fabric includes: a coating step of coating a functional agent on one surface of a first fiber layer; a laminating step of laminating a second fiber layer on the one surface of the first fiber layer; and a binding step of binding fibers between the first fiber layer and the second fiber layer after the laminating step, and forming a nonwoven fabric in which the first fiber layer and the second fiber layer are integrated.SELECTED DRAWING: None

Description

  The present invention relates to a non-woven fabric containing a functional agent, a method for producing the same, and an absorbent article.

  In recent years, with regard to non-woven fabrics used for surface sheets and the like that touch the skin of absorbent articles, proposals have been made to enhance the feeling of wearing such as dryness. For example, Patent Document 1 describes that a liquid film cleaving agent can cleave a liquid film generated in a narrow space between fibers of a non-woven fabric to reduce the liquid residue in the non-woven fabric. Thereby, the dry property of a nonwoven fabric can be improved greatly.

JP, 2016-117981, A

The inventors of the present invention have realized improvement in liquid residue reduction of the non-woven fabric to be the surface sheet, using the liquid film cleaving agent described in Patent Document 1.
On the other hand, in the surface sheet of the absorbent article to which a functional agent has been applied, there is room for improvement from the viewpoint of providing a good touch when contacting the skin of the wearer.

  This invention is made in view of said point, and relates to the nonwoven fabric, its manufacturing method, and absorbent article which can realize simultaneously expression of a function of contained functional agent, and improvement of touch.

  The present invention relates to a non-woven fabric having a property that the functional agent is present more inside than the outermost surface, and the functional agent has the property of being able to diffuse at least in the thickness direction by passing the liquid.

  Moreover, this invention is an absorbent article which has an absorber which is arrange | positioned between a surface sheet, a back surface sheet, and the said surface sheet and the said back surface sheet, Comprising: The absorbent article which used the said nonwoven fabric for the said surface sheet About.

  Furthermore, in the present invention, a coating step of coating a functional agent on one side of the first fiber layer, and a lamination step of laminating a second fiber layer on the one side of the first fiber layer after the coating step; A bonding step of bonding fibers between the first fiber layer and the second fiber layer after the laminating step to form a nonwoven fabric in which the first fiber layer and the second fiber layer are integrated; It relates to the manufacturing method.

  According to the present invention, it is possible to simultaneously realize the expression of the function of the contained functional agent and the improvement of the touch.

  The non-woven fabric according to the embodiment of the present invention is a non-woven fabric in which the functional agent is present more inside than the outermost surface. In the present embodiment, the functional agent can be diffused at least in the thickness direction by passing the liquid (hereinafter sometimes referred to as passing) so that the amount of the functional agent on the outermost surface of the non-woven fabric increases after passing the liquid. It has the nature. In addition, in description of this embodiment, "the outermost surface of a nonwoven fabric" means the thing of the surface exposed in the surface side and back surface side of a nonwoven fabric.

In the present embodiment, the functional agent is disposed inside the non-woven fabric. However, due to its diffusibility, the functional agent of the present embodiment can move from the original location to the other area of the non-woven fabric by passing through, and can exhibit the function of the functional agent.
Specifically, the diffusivity is caused by dissolution of the functional agent in the liquid impregnated in the non-woven fabric when the liquid is allowed to pass through the non-woven fabric if it is soluble in the liquid through which the (I) functional agent passes. When the liquid is passed through the non-woven fabric, it exhibits diffusion, and (II) the functional agent is insoluble in the passing liquid and the expansion coefficient of the functional agent to the passing liquid is positive. It shows the diffusion caused by wetting and spreading of the functional agent on the surface.

In the present embodiment, the functional agent can diffuse at least in the thickness direction, but the functional agent is preferably diffused in any direction of the thickness direction and the planar direction of the nonwoven fabric.
By diffusion of the functional agent in the thickness direction, it is considered that the functional agent present inside the outermost surface of the non-woven fabric before liquid permeation moves to the outermost surface of the non-woven fabric by liquid permeation. Thereby, the functional agent can be present more inside than the outermost surface of the nonwoven fabric, and the existing amount of the functional agent on the outermost surface of the nonwoven fabric can be reduced. Can be expected. Moreover, when used for the surface sheet of an absorbent article, for example, there are many things which are generally expected to exhibit the function in the outermost surface which touches a skin, for example. Therefore, after passing through, the function of the functional agent moved to the outermost surface can be well expressed. Even with functional agent coating on the non-skin-contacting surface of the surface sheet, there is a possibility that compatibility between the touch and the function of the functional agent can be achieved, but the region where the functional agent is present before flowing is closer to the skin It is preferable to keep the functional agent in the middle layer of the non-woven fabric, because the function of the functional agent can be expressed well.
Moreover, since the diffusion of the functional agent occurs in the planar direction, it is possible to increase the area in which the function of the functional agent is developed by liquid flow. As a result, the application rate on the application surface of the functional agent can be suppressed to a low level, and even if the amount of the functional agent in the planar direction varies, the effect of causing the function to be widely exhibited can be expected.

In the present specification, “passage of liquid” or “passage of liquid” can be defined as the treatment performed by the method described in the examples described later, but specifically, the following (1) or (2) Passing each solution under the conditions of).
(1) In the case where the liquid is menstrual blood Absorber obtained by covering a fiber assembly made of fiber material such as pulp fibers with an absorbent polymer covered with a covering sheet such as tissue paper or non-woven fabric If filled, the absorbent body may be substituted with the one obtained by removing the surface sheet of a commercially available sanitary napkin), and the non-woven fabric containing the functional agent may be substituted between the surface sheet and the absorbent body during lamination. Then, a hot melt type adhesive is intermittently applied and joined in a summit shape so as to have a coating basis weight of 4.0 g / m ^2, and the sample is further sealed and fixed in the periphery, An acrylic plate having a transmission hole with an inner diameter of 1 cm is stacked, and a constant load of 100 Pa is applied to the sample, and under such a load, menstrual blood (simulated with a speed of 6 g / sec from the transmission hole of the acrylic plate) ) Including pouring menstrual blood Cormorant.
(2) When the liquid is urine For a non-woven fabric containing a functional agent, the non-woven fabric is sandwiched between the flanges of a flanged glass cylinder with an inner diameter of 35 mm, and 0.2 mL / sec using a pipette with an inner diameter of 0.74 mm at the tip hole. Dropping urine (including simulated urine) at the center of the cylinder at a speed of
At this time, even when the non-woven fabric containing the functional agent is fixed to the absorbent article such as a diaper, a sanitary napkin, a panty liner or the like by hot melt etc., a cold spray is sprayed to lose the adhesion of the hot melt. A single nonwoven fabric can be obtained by activating it.

(Functional agent)
In the present embodiment, the functional agent has an effect of causing the function to appear on the outermost surface of the non-woven fabric by passing the liquid, and preferably a liquid having a solubility of not less than 0.025 g in deionized water (hereinafter also referred to as functional agent A). Or a liquid whose solubility in deionized water is smaller than 0.025 g and whose expansion coefficient to a liquid having a surface tension of 50 mN / m is larger than 0 mN / m (hereinafter, also referred to as functional agent B). The method of measuring the solubility in deionized water and the method of measuring the expansion coefficient with respect to a liquid having a surface tension of 50 mN / m in the present specification are methods described in Examples described later.

  In the functional agent A which is a liquid having a solubility of 0.025 g or more in deionized water, when the solubility is 0.025 g or more, the functional agent A is easily dissolved in the passing liquid and is in contact with the liquid It is thought that diffusion occurs by dissolution in the liquid and the addition of mobility. 0.06g or more is preferable and, as for the solubility of the functional agent A, 0.3 g or more is more preferable.

As the functional agent A, for example, "a drug having a skin care effect" described in JP-A-2002-146674 and the like can be mentioned. Here, the skin care effect means the whole effect of normalizing the condition of the skin such as skin rash prevention, anti-inflammatory, scratch prevention, and anti-bacterial.
As agents having skin care effects, specifically, various plant extracts, ceramides such as natural ceramide and pseudoceramide, collagen, moisturizing agents [squalane, squalene, natural moisturizing component (NMF), 1,3-butylene glycol, propylene Glycol, glycerin, etc.], keratinase softener [Arginine, guanidine derivative (eg, organic acid salt of 2- (2-hydroxyethoxy) ethyl guanidine, organic acid, succinic acid, glycolic acid, lactic acid, malic acid , Citric acid, tartaric acid etc.] and the like. In particular, plant extracts, ceramides and natural moisturizing ingredients (NMF) are preferably used from the viewpoint of water solubility, skin care effect, and cost. Among ceramides, it is preferable to use pseudoceramide because natural ceramide is difficult to extract, expensive and unstable. It is preferable to use water retention ceramide and barrier ceramide as pseudo ceramide.

  Plant extracts are extracted with a solvent at room temperature or under heating after being ground without drying or drying one or two or more of the whole plant or its leaves, bark, roots and branches. It is obtained by extraction using an extraction tool such as a Soxhlet extractor. Any plant extract can be used without particular limitation as long as it has a skin care effect. In particular, the skin care effect is further enhanced by using peach leaf extract, persimmon extract, hamamelis extract, asunaro extract, aloe extract, aubergine extract or eucalyptus extract as a plant extract. Among these, from the viewpoint of further improving the skin care effect, it is preferable to use a hamamelis extract, an asunaro extract or a peach leaf extract. In terms of the high solubility of plant extracts in water, and the fact that explosion-proofing is relatively easy in the case where heat treatment is performed in the processing step of the fiber assembly that is the material of the non-woven fabric, plant extracts It is preferred that it is a 3-butylene glycol extract.

On the other hand, in the functional agent B which is a liquid whose solubility in deionized water is smaller than 0.025 g and whose expansion coefficient to a liquid having a surface tension of 50 mN / m is larger than 0 mN / m, the solubility is smaller than 0.025 g, The functional agent B is difficult to dissolve in the passing liquid, and the liquid comes in contact with the non-woven fabric to form an interface with the non-woven fibers or between the fibers of the non-woven fabric or a liquid film (hereinafter referred to simply as liquid film). It is believed that this causes diffusion. From the same viewpoint, the solubility of the functional agent B is preferably 0.0025 g or less, more preferably 0.0017 g or less, and still more preferably less than 0.0001 g. In addition, the solubility of the functional agent B is preferably 0 g or more, and it is practical to set the solubility to 1.0 × 10 ⁻⁹ g or more from the viewpoint of the diffusibility to the liquid film.

  In addition, the expansion coefficient of the functional agent B for a liquid having a surface tension of 50 mN / m is larger than 0 mN / m, that is, a positive value, and is preferably 20 mN / m or more from the viewpoint of sufficiently exhibiting diffusivity. 25 mN / m or more is more preferable, and 28.5 mN / m or more is more preferable. On the other hand, the upper limit thereof is not particularly limited, but is preferably 50 mN / m or less.

  As the functional agent B, for example, the “liquid film cleaving agent” described in WO 2016/098796 and the like can be mentioned. Here, the liquid film cleaving agent refers to a liquid, for example, a body fluid (excreted liquid such as menstrual blood, urine and sweat) touching the nonwoven fabric to cleave the liquid film formed between fibers of the nonwoven fabric or on the fiber surface. Refers to an agent that inhibits the formation of a liquid film.

  In the present embodiment, among the liquid film cleaving agents described in the above-mentioned WO 2016/098796 and the like, organic modified silicone (polysiloxane), which is a silicone surfactant, is mentioned as a preferable one. Furthermore, modified silicones having a structure having at least one oxygen atom in the modifying group such as polyoxyalkylene modified silicones, epoxy modified silicones, carbinol modified silicones, diol modified silicones and the like are preferable, and polyoxyalkylene modified silicones are particularly preferable. The polyoxyalkylene-modified silicone, having a polysiloxane chain, hardly penetrates into the inside of the fiber and easily remains on the surface. Further, the addition of a hydrophilic polyoxyalkylene chain increases the affinity to water and lowers the interfacial tension, so that diffusion is likely to occur, which is preferable. In addition, even if the polyoxyalkylene-modified silicone is subjected to hot melt processing such as embossing, it tends to remain on the surface of the fiber at that portion, and the liquid film cleaving action is maintained. In particular, the liquid film cleaving action is sufficiently expressed in the embossed portion where the liquid tends to be accumulated, which is preferable.

  In the case of the polyoxyalkylene-modified silicone, the expansion coefficient and the solubility in deionized water can be in a predetermined range by, for example, the addition mole number of the polyoxyalkylene group, the modification ratio, and the like. The surface tension of the liquid film cleaving agent and the interfacial tension of the liquid film cleaving agent with the liquid film can be similarly set to predetermined ranges.

  The addition mole number of the polyoxyalkylene group is the bonding number of the oxyalkylene group forming the polyoxyalkylene group to 1 mole of the polyoxyalkylene modified silicone, and from the above viewpoint, the addition mole number of the polyoxyalkylene group is 1 or more is preferable and 3 or more is more preferable. Moreover, 30 or less is preferable, 20 or less is more preferable, and 10 or less is more preferable.

  The modification ratio of the modified silicone is the ratio of the number of repeating units of the modified siloxane bond to the total number of repeating units of the siloxane bond in one modified silicone molecule. The modification ratio of the modified silicone is preferably 5% or more, more preferably 10% or more, and still more preferably 20% or more because the hydrophilicity may be impaired if the modification ratio is too low. Moreover, since it will tend to melt | dissolve in water when too high, 95% or less is preferable, 70% or less is more preferable, and 40% or less is more preferable.

  In addition, the expansion coefficient and the solubility in deionized water in the polyoxyalkylene-modified silicone may be combined with a water-soluble polyoxyethylene group and a water-insoluble polyoxypropylene and polyoxybutylene group as a modifying group. Set the predetermined range by changing the molecular weight of the water-insoluble silicone chain, introducing an amino group, an epoxy group, a carboxy group, a hydroxyl group, a carbinol group, etc. in addition to the polyoxyalkylene modification as a modifying group. it can.

The liquid film cleaving agent preferably has a weight average molecular weight of 500 or more. The weight average molecular weight greatly affects the viscosity of the liquid film cleaving agent. By keeping the viscosity high, the liquid film cleaving agent is unlikely to flow off when the liquid passes between the fibers, and the durability of the liquid film cleaving effect in the non-woven fabric can be maintained. The weight average molecular weight of the liquid film cleaving agent is more preferably 1000 or more, still more preferably 1500 or more, and particularly preferably 2000 or more, from the viewpoint of setting the viscosity sufficient to sustain the liquid film cleaving effect. On the other hand, the weight-average molecular weight of the liquid film cleaving agent is preferably 50,000 or less, from the viewpoint of maintaining the transfer of the liquid film cleaving agent from the fiber in which the liquid film cleaving agent is disposed to the liquid film, that is 20,000 or less is more preferable, and 10,000 or less is more preferable. The measurement of the weight average molecular weight is measured using gel permeation chromatography (GPC) “CCPD” (manufactured by Tosoh Corporation) under the following measurement conditions. Moreover, calculation of conversion molecular weight is performed with polystyrene.
Separation column: GMHHR-H + GMHHR-H (cation)
Eluent: L-Pharmin DM20 / CHCl ₃
Solvent flow rate: 1.0 mL / min
Separation column temperature: 40 ° C

The viscosity of the liquid film cleaving agent is preferably 0 cps or more, more preferably 6000 cps or less, still more preferably 600 cps or less, and particularly preferably 200 cps or less. The unit cps of viscosity is converted by 1 cps = 1 × 10 ⁻³ Pa · s.

(Non-woven fabric)
In the present embodiment, as the non-woven fabric to be used, one having integrity by bonding by heat fusion of fibers is preferable. For bonding by heat fusion, for example, heat fusible fibers are used as constituent fibers. Examples of the heat treatment include hot air treatment, embossing thermocompression bonding treatment and ultrasonic treatment.
Moreover, when a nonwoven fabric has several fiber layers, not only in each fiber layer but fiber layers are couple | bonded by the said heat sealing | fusion. That is, at the interface between the fiber layers, the fibers of both fiber layers are bonded by heat fusion. In this case, as long as the integrity as a non-woven fabric is maintained, the fiber layers may be bonded on the entire surface, or may be partially bonded.
In addition, although it is preferable that there is no bond by an adhesive agent from a viewpoint of maintaining the soft touch of a nonwoven fabric, the bond of fibers and the bond between fiber layers are not limited to this. For example, it is possible to adopt various bonding methods such as a chemical bonding method, a needle punch method and a water flow confounding method.

  When a nonwoven fabric has a plurality of fiber layers, the form of each fiber layer can be changed, which is preferable. For example, the capillary pressure on the back side can be made higher than on the front side, and the capillary pressure difference between the both sides can be made larger, and the liquid after the functional agent has diffused can be more easily drawn to the back side than in the single layer. Can. As a specific form of each fiber layer to increase the capillary pressure difference, the fiber density was increased by increasing the basis weight on the back side rather than the surface side, or by reducing the fiber diameter, or the hydrophilicity was increased. The form etc. are mentioned. Moreover, when a nonwoven fabric has a several fiber layer, since the application ratio of a functional agent can be set precisely, it is preferable.

  Therefore, the non-woven fabric according to the present embodiment has a first fiber layer, which is a lower fiber layer, and a second fiber layer, which is an upper fiber layer stacked on the first fiber layer, and the functional agent is It is preferable that it is a nonwoven fabric apply | coated to the interface between the said 1st fiber layer and the said 2nd fiber layer. In the case where the non-woven fabric has a plurality of fiber layers such as the first fiber layer and the second fiber layer, the function of the functional agent applied with high accuracy at an intermediate position between the first fiber layer and the second fiber layer It can be expected that it can be exhibited higher by combining with the liquid draw-in force by the In the present embodiment, the “first fiber layer” and the “second fiber layer” mean various fiber aggregates such as a non-woven fabric, a fiber web or a long fiber layer.

(Abundance of functional agent)
In the present embodiment, the content ratio of the functional agent to the fiber mass of the whole nonwoven fabric (hereinafter sometimes referred to as OPU (Oil Per Unit)) is preferably 3.6% by mass or less, and more preferably 1.8% by mass or less Preferably, 0.7% by mass or less is more preferable. This makes the feel of the non-woven fabric preferable. Moreover, from a viewpoint of fully exhibiting the function of a functional agent, 0.04 mass% or more is preferable, as for the said content rate, 0.18 mass% or more is more preferable, 0.36 mass% or more is more preferable.

  In the present embodiment, in the non-woven fabric coated with the functional agent, the content ratio (OPU) of the functional agent to the fiber mass of the non-woven fabric at the portion coated with the functional agent is sufficient for the functional agent to diffuse in the planar direction and thickness direction of the non-woven fabric. From the viewpoint of exhibiting the function of the functional agent, the content is preferably 0.1% by mass or more, more preferably 0.4% by mass or more, and still more preferably 0.8% by mass or more. Further, from the viewpoint of reducing the stickiness of the skin and from the viewpoint of making the feel of the non-woven fabric good, the content is preferably 8% by mass or less, more preferably 4% by mass or less, and 1.5% by mass or less It is further preferred that In addition, the nonwoven fabric which apply | coated the functional agent shows the fiber layer of the side which apply | coated the functional agent, in the case of the nonwoven fabric which has a said 1st fiber layer and a 2nd fiber layer. Therefore, when the functional agent is applied to the first fiber layer and then the second fiber layer is laminated, for example, the ratio can be said to be the ratio of the functional agent to the fiber mass of the first fiber layer.

  In the nonwoven fabric which concerns on this embodiment, the method as described in the Example mentioned later, the method shown below etc. can be used as a method of confirming the abundance of a functional agent.

First, cold spray is sprayed on absorbent articles such as diapers, sanitary napkins and panty liners to deactivate the adhesion of the hot melt, and parts where non-woven fabrics are used (for example, surface sheets etc. Describe the case where the top sheet is used.
The surface sheet is prepared by processing the surface sheet cut into 30 × 100 mm into small pieces of 3 × 10 mm for measuring the amount of functional agent in the thickness direction, and slicing each into 3 equal portions in the thickness direction using a razor It can be used. Further, for measuring the amount of the functional agent on the outermost surface, the peeled surface sheet can be used as it is without being sliced in the thickness direction.

The amount of functional agent is measured using a chromatograph and a mass spectrometer as a method to check that the functional agent has diffused in the thickness direction and the functional agent concentration distribution in the thickness direction has become smaller, in [g / cm ² ] There is a method of comparing standardized amounts. The value of the denominator (cm ² ) means the projected area of the surface sheet before cutting out as viewed from the plane direction. The thickness may change before and after passing through, so it need not be used for normalization, and can be sampled in three equal parts with respect to a given thickness. In addition, "the outermost surface" in this embodiment means front and back both surfaces as mentioned above, and when dividing into three equally, it shall refer to the 1st and 3rd layer. In particular, when the nonwoven fabric of the present invention is used as a surface sheet of an absorbent article, the outermost surface located on the skin surface side of the absorbent article is a skin side layer, and the outermost surface on the opposite side is a non-skin side layer. The part sandwiched between is the middle layer. In the case of a functional agent that functions on the skin side, the ratio of the functional agent concentration in the middle layer to the functional agent concentration in the skin side layer is relative to the functional agent concentration in the non-skin side layer. It is preferable that the ratio of the concentration of the functional agent in the intermediate layer be reduced by passing the solution. In particular, in the functional agent A, it is more preferable that the concentration ratio is twice or less as compared to that before the solution is passed.

In addition, as a method to check that the functional agent has diffused to the surface, first, on the surface of the prepared surface sheet before liquid passage, a paper wiper (Kimwipe S-200) made by Nippon Paper Cresia Co., Ltd. on the circular bottom of φ 20 mm Fold it in two along the long side, attach it to the surface of the surface sheet containing the functional agent with a pressure of 30Pa, and a total of 10 rotations of rubbing at a speed of 1rpm (if reciprocating, sum of absolute values of rotation angles Is 3600 °), and then the sliding surface (φ 20 mm) of the sheet substrate (the paper wiper) slid on the top sheet is cut out, and the amount of functional agent is determined using a chromatograph and a mass spectrometer. Measure and compare the amount standardized in [g / cm ² ]. Thereby, the functional agent present on the surface of the top sheet before passing through is sampled. Next, the top sheet after passing through is dried in the circulating hot air drier set at 100 ° C. until the mass reduction rate of the passing part becomes 1% by mass / hour or less, and then the same procedure is followed. Measure the amount of functional agent and compare the amount standardized in [g / cm ² ]. Thereby, the functional agent present on the surface of the top sheet after passing through is sampled. Then, there is a method of checking that the functional agent has diffused to the surface by liquid flow by comparing the sampling data before liquid flow with the sampling data after liquid flow.

(Method of manufacturing non-woven fabric)
The manufacturing method of the nonwoven fabric concerning this embodiment laminates the 2nd fiber layer on the above-mentioned single side of the above-mentioned 1st fiber layer after the coating process of applying a functional agent on the single side of the 1st fiber layer, and the above-mentioned coating process. And bonding the fibers between the first fiber layer and the second fiber layer after the laminating step to form a nonwoven fabric in which the first fiber layer and the second fiber layer are integrated. And.

(Coating process)
The coating step is a step of coating a functional agent on one side of the first fiber layer having heat fusible fibers.
In the coating step, coating the functional agent on one side of the first fiber layer mainly refers to adhesion to the surface of the fiber. However, as long as the functional agent remains on the surface of the fiber, it may be contained in the fiber or may be present in the fiber by internal addition. As a method of applying a functional agent to the surface of a fiber, various methods which are usually used can be adopted without particular limitation. For example, various contact coatings such as flexographic printing, gravure printing, screen printing, slot die printing and brush coating, and non-contact coatings such as spraying and inkjet printing can be mentioned. These treatments may be performed on fiber webs formed by various known methods (dry method, wet method, spun bond method, melt blow method, air laid method, etc.) or after the web is made into nonwoven fabric. You may go. That is, the first fiber layer may be a non-woven fabric or a fiber web.

  When the first fiber layer is an air through non-woven fabric, the coating amount of the functional agent is preferably 400% by mass or less of the base material and 300% by mass or less as the WET coating amount in order to suppress the penetration of the functional agent. More preferable. Moreover, when a 1st fiber layer is a spun bond nonwoven fabric, 125 mass% or less of a base material is preferable, and 94 mass% or less is more preferable.

  The fiber with the functional agent attached to the surface may be provided with a drying process in which the fiber is dried at a temperature (for example, 120 ° C. or less) sufficiently lower than the melting point of the fiber resin using, for example, a hot air blower type dryer. It is not necessary to provide it. Moreover, when making it adhere to a fiber using the said coating method, you may use it as a solution containing the functional agent which dissolved the functional agent in the solvent as needed, and an application liquid in the state of an emulsion liquid or a dispersion liquid. In order to have the effect of the functional agent in the non-woven fabric, the functional agent is preferably present as a liquid when the functional agent is in contact with body fluid. From this point, the melting point of the functional agent is preferably 40 ° C. or less, and more preferably 35 ° C. or less. Furthermore, -220 degreeC or more is preferable and, as for melting | fusing point of the functional agent which concerns on this embodiment, -180 degreeC or more is more preferable.

(Lamination process)
The laminating step is a step of laminating the second fiber layer on one side of the first fiber layer coated with the functional agent. In the laminating step, the second fiber layer may be laminated with the first fiber layer in the same form or in a different form. That is, for example, after a functional agent is coated on one side using a non-woven fabric as the first fiber layer, it is also possible to further laminate a fiber web as the second fiber layer.

  In the present embodiment, after the coating step, the laminating step is performed without going through the winding step of winding the first fiber layer coated with the functional agent, that is, the coating step It is preferable that the and the laminating step be performed inline. By not having a winding process between the coating process and the laminating process, even if the functional agent coated in the coating process is present in a liquid state on the coated surface of the first fiber layer, Contamination of the transfer device caused by the coated surface coming into contact with various places of the transfer device is reduced during transfer of the first fiber layer after work, and to the non-coated surface of the first fiber layer generated when there is a winding process. It is possible to suppress the offset of the functional agent of Even when using a functional agent that can be dried, adopting a drying step increases the cost of equipment and energy required for drying, and in general, the drying rate tends to be a rate-limiting factor in the entire process, so the process design flexibility Since it takes away, it can be an advantage in the process that the offset of the functional agent can be suppressed without providing the drying step. In addition, it is possible to suppress the offset of the functional agent and the contamination of the transfer device by laminating a protective paper (paper) on the coated surface before the winding process, but in this case, the protective paper In addition to the increase in cost and resource consumption associated with the use of the agent, there is a concern that the efficiency of use of the functional agent may decrease due to the removal of the functional agent in the protective paper. On the other hand, in the present embodiment, since it is not necessary to use such a protective paper, there is also an advantage that these concerns do not occur. In addition, coating the functional agent in the non-woven fabric manufacturing process can reduce the number of coating machines installed as compared with coating in the product processing process such as diapers and sanitary napkins, and so the depreciation cost of equipment It also leads to a reduction in line maintenance time.

(Bonding process)
The bonding step bonds the fibers between the first fiber layer and the second fiber layer by heat treatment at a temperature higher than the melting point of the heat-sealable fibers, and the first fiber layer and the second fiber layer are integrated. Forming the non-woven fabric.
The heat treatment at a temperature higher than the melting point of the heat-fusible fiber may be either one of embossing and pressure treatment and hot air treatment, or both. Moreover, when performing an embossing pressure-bonding process, you may perform the hot-air process in the temperature of "the melting point or less" of a heat-fusible fiber after that.

  In the present embodiment, after the laminating step, the bonding step is performed without going through the winding step of winding up the first fiber layer and the second fiber layer, that is, the laminating step and the bonding step Is preferably performed inline.

(First fiber layer forming step)
In the embodiment, the method further includes a first fiber layer forming step of forming the first fiber layer before the coating step, and the first fiber layer after the first fiber layer forming step. Preferably, the coating step is performed without taking up the winding step, that is, the first fiber layer forming step and the coating step are performed in line.

(Second fiber layer forming step)
Furthermore, in the present embodiment, a second fiber layer forming step of forming the second fiber layer is further included before the laminating step, and the second fiber layer is formed after the second fiber layer forming step. It is preferable that the laminating step be performed without taking up the winding step, that is, the second fiber layer forming step and the laminating step be performed inline.

  And, in the present embodiment, it is carried out inline between each process, preferably from the first fiber layer forming process to the bonding process, from winding up (recovering) to the manufactured nonwoven fabric. As a result, since it is not necessary to provide a winding device between each process, it is possible to shorten the manufacturing time and to reduce the facility cost and the installation area.

  The non-woven fabric produced as described above is preferably cut into an appropriate size and used as a surface sheet of the absorbent article. In addition, about the manufacturing method of an absorbent article, since various well-known methods are employable, the description is abbreviate | omitted.

[Absorbent Article]
The absorbent article according to the present embodiment includes a top sheet, a back sheet, and an absorbent disposed between the top sheet and the back sheet, and the nonwoven fabric of the present embodiment is used as the top sheet. It is used. The absorbent article of the present embodiment can be, for example, various types that absorb and hold body fluid, such as sanitary napkins, panty liners, incontinence pads, diapers, and urine absorbing pads.

  The top sheet is liquid-permeable, and the nonwoven fabric of the present embodiment can be preferably used. The non-woven fabric is preferably a hydrophilic thermal-bonded non-woven fabric from the viewpoint of rapidly absorbing the excreted body fluid and transmitting it to the absorber and from the viewpoint of the touch feeling, and an air-through non-woven fabric is particularly preferable. Further, it is preferable that the thermoplastic resin fiber has been subjected to the hydrophilization treatment, and the fiber is a fiber subjected to a three-dimensional crimp such as a secondary crimp or a tertiary crimp. Specifically, polyethylene, polypropylene, polyester, nylon, and fibers obtained by preparing these composite fibers and cutting them into a predetermined length to form staples are coated with various hydrophilizing agents. Is preferred. As the hydrophilization treatment, various alkyl sulfonates represented by α-olefin sulfonate, acrylate, acrylate / copolymer, ester amide, salt of ester amide, polyethylene glycol and derivatives thereof, Treatment with a known hydrophilizing agent such as a water-soluble polyester resin, various silicone derivatives, various saccharide derivatives, and mixtures thereof can be used. Specifically, the hydrophilizing agent is, for example, alkyl phosphate ester potassium salt, dialkyl sulfosuccinate sodium salt, alkyl (stearyl) betaine, polyoxyethylene (number of added moles: 2) stearylamide, polyoxyethylene / polyoxypropylene Modified silicone and the like are preferably used.

As an absorber, what is used for articles | goods of this kind can be employ | adopted arbitrarily, without restricting in particular. For example, one obtained by coating an absorbent core made of a hydrophilic fiber assembly with a core wrap sheet, and the like can be mentioned. The super absorbent polymer may be further disposed in the absorbent core. Examples of the material of the core wrap sheet include paper and pulp sheets manufactured using hydrophilic fibers as a raw material, and hydrophilic non-woven fabrics.
The absorber may be in the form of a sheet. As a sheet-like absorber, the paper and pulp sheet etc. which were manufactured using hydrophilic fiber as a raw material are mentioned, for example. In addition, a water-absorbent sheet (for example, described in JP-A-8-246395) in which an absorbent core made of an aggregate of highly water-absorbent polymer materials is sandwiched and fixed between two base sheets (absorbent paper or non-woven fabric). Water-absorbent sheets, polymer sheets described in JP-A-2004-275225, and the like can be mentioned.

  As a material of the back sheet, it is possible to use a moisture-permeable film alone, a laminate obtained by laminating a film and a non-woven fabric, a water-repellent non-woven fabric (SMS, SMMS, etc.). It is preferable to use the moisture-permeable film alone as the leak-proof material from the viewpoint of cost and matching with the anti-slip adhesive and the like. As the film material in this case, a film obtained by melt-kneading and extruding a thermoplastic resin and an inorganic filler incompatible with the thermoplastic resin is drawn to a predetermined size and micro-perforated, or essentially water And a nonporous film capable of discharging water vapor like a permeable membrane.

  Hereinafter, the present invention will be specifically described based on examples, but these do not limit the object of the present invention.

First, the measurement method used in the examples is shown.
[Measuring method]
(Solubility in deionized water)
The functional agent was gradually dissolved and dissolved (flotation, precipitation, precipitation, cloudiness, etc.) while stirring 100 g of deionized water with a stirrer in an environment area of temperature 25 ° C. and relative humidity (RH) 65%. The amount of dissolution at the time when it was observed was taken as the solubility in deionized water. The solubility was measured by adding an agent every 0.0001 g. As a result, it was determined that "less than 0.0001 g" was observed as "less than 0.0001 g", 0.0001 g was dissolved, and "0.0001 g" was observed as if 0.0002 g was not dissolved. The other values were also measured by the same method.

(Expansion factor for liquids with a surface tension of 50 mN / m)
The expansion coefficient was determined based on the following formula (1) from the measurement values obtained by the measurement method described in WO 2016/098796 in an environmental region of a temperature of 25 ° C. and a relative humidity (RH) of 65%.
S = γ _w −γ _o −γ _{w o} (1)
γ _w : Surface tension of liquid film (liquid)
γ _o : Surface tension of liquid film cleaving agent
γ _wo : interfacial tension of the liquid film cleaving agent with the liquid film In the present example, “liquid having a surface tension of 50 mN / m” is polyoxyethylene surfactant which is a nonionic surfactant in 100 g of deionized water. A solution in which 3.75 μL of sorbitan monolaurate (Kao Co., Ltd., trade name: Leoall Super TW-L120) was added with a micropipette (ACURA 825, Socorex Isba SA) to adjust the surface tension to 50 ± 1 mN / m. Was used.

(Viscosity of functional agent)
40 g of the functional agent was prepared, and the viscosity was measured using a tuning-fork type vibration viscometer SV-10 (manufactured by A & D Co., Ltd.) in an environment region of a temperature of 25 ° C. and a relative humidity (RH) of 65%. This was repeated three times, and the average value was adopted as the viscosity. When the functional agent was solid, it was heated to the melting point of the functional agent + 5 ° C to cause phase transition to a liquid, and the measurement was carried out with the temperature condition.

(Ratio of functional agent to fiber mass (OPU))
The weight of the topsheet was measured, and then the component containing the functional agent was removed from the topsheet. From the mass of the residue, the total mass of the functional agent and other components was measured. Thereafter, the extract was separated and isolated using liquid chromatography, and the mass ratio of the functional agent to the other components was calculated from the mass ratio of the separated material. Moreover, the ratio (OPU (mass%)) of the functional agent with respect to the total fiber mass of a surface sheet was computed using the mass ratio, the mass of the said residue, and the mass of the said surface sheet. Moreover, the ratio (OPU (mass%)) of the functional agent with respect to the fiber mass of the 1st fiber layer was computed by calculating the ratio for which the 1st fiber layer accounts among the mass of a surface sheet.

[Example using functional agent A]
<Manufacture of non-woven fabric>
(Preparation of functional agent A)
As a functional agent A, Falcorex hamamelis B (manufactured by Ichimaru Falcos Co., Ltd.), which is a hamamelis extract, was prepared, and 0.1 mass% of red No. 2 was dissolved. Since Falcorex hamamelis B is a liquid material in which water is half of the solvent, the solubility in deionized water is infinite.

Example 1
A card web is formed by the card method using an eccentric core-sheath composite heat-fusible fiber consisting of a denier 1.2 dtex, a core: polyethylene terephthalate (PET), a sheath: polyethylene (PE), and a mass ratio of 50/50 PET / PE. A functional agent A was sprayed onto the hot-air-blown surface of an air-through non-woven fabric (first fiber layer) having a basis weight of 21 g / m ² which was manufactured by hot-air treatment and sheeted with an air-through heat treatment machine. It mass-sprayed and it was made to dry by leaving it to stand at 50 degreeC for 20 minutes for 20 minutes.
There, a PET / PE air through non-woven fabric (second fiber layer) having a basis weight of 21 g / m ² manufactured in the same manner as described above is superposed so that the hot air blowing surface is aligned, and ultrasonic embossing (emboss pattern: dot diameter 2 mm) The non-woven fabric according to Example 1 was obtained by bonding (placement of one non-woven fabric) by emboss at the arrangement of square grid intersections with a minimum grid side length of 3.54 mm).

(Example 2)
A nonwoven fabric according to Example 2 was obtained in the same manner as Example 1, except that the amount of the sprayed functional agent A was changed to 40.0% by mass.

(Example 3)
A nonwoven fabric according to Example 3 was obtained in the same manner as Example 1, except that the amount of the sprayed functional agent A was changed to 45.7% by mass.

(Comparative example 1)
A card web is formed by the card method using an eccentric core-sheath composite heat-fusible fiber consisting of a denier 1.2 dtex, a core: polyethylene terephthalate (PET), a sheath: polyethylene (PE), and a mass ratio of 50/50 PET / PE. ^Two sheets of air-through non-woven fabric having a basis weight of 21 g / m ² , which is manufactured by hot-air treatment using an air-through heat treatment machine and sheeted, are superimposed on each other so that the hot air blowing surface is combined, ultrasonic embossing (emboss pattern: dot diameter 2 mm After placing the emboss on the square grid intersection of minimum grid side length 3.54 mm) (making one non-woven fabric), the functional agent A on the net surface, using a spray, 31.4 mass % Non-woven fabric according to Comparative Example 1 was obtained by spraying it and leaving it to stand in a hot air dryer at 50 ° C. for 20 minutes.

(Comparative example 2)
A PET / PE air through nonwoven fabric with a basis weight of 21 g / m ² as in Example 1 in which the functional agent A was not sprayed was used as a nonwoven fabric according to Comparative Example 2.

<Evaluation of non-woven fabric>
(Observation before liquid flow)
A non-woven fabric to be observed on a surface having an L value of 90.17, an a value of −0.60, and a b value of 1.90 in the Lab color space, in which 16 copy sheets having an average basis weight of 65 g / m ² are laminated. Lab color space measurement of the surface of the non-woven fabric with the non-woven fabric on the side of installation and spray-sprayed as the upper surface was performed. The Lab color space measurement was calculated by averaging n = 5 areas of φ 8 mm using a spectral color difference meter (Handy type color difference meter NF333 (measurement probe ND120) manufactured by Nippon Denshoku Kogyo Co., Ltd.).
Moreover, the nonwoven fabric surface (the non-coated surface side of the 1st fiber layer) was palpated, and the touch was evaluated by the following three steps.
3: Do not feel stickiness (equivalent to Comparative Example 2)
2: Do not feel sticky (somewhat, but considerably weaker than Comparative Example 1)
1: feel stickiness (equivalent to comparative example 1)

(Passing test)
The non-woven fabric is held between the flanges of a flanged glass cylinder with an inner diameter of 35 mm, and 1 mL of deionized water is dropped into the center of the cylinder at a speed of 0.2 mL / sec using a pipette with an inner diameter of 0.74 mm at the tip hole. I let it go. The non-woven fabric after passing through was allowed to stand for 1 hour in a hot air dryer whose temperature was adjusted to 100 ° C.

(Observed after passing)
The L value of the surface of the non-woven fabric was measured by the same method as that before the liquid flow. When the a value after the liquid flow is higher than the a value before the liquid flow, it indicates that the functional agent unevenly distributed in the middle in the thickness direction is diffused and exposed to the surface side by the liquid flow.

  From Table 1, in the nonwoven fabrics of Examples 1 to 3 in which the coated surface was in the middle, it was found that the a value was increased by liquid flow, and the coated functional agent was exposed on the surface side. That is, when applying the non-woven fabric as shown in Examples 1 to 3 to the top sheet of the absorbent article, the functional agent dissolved in the liquid overflowing the top sheet before the liquid to be passed through is absorbed by the absorbent is The functional agent can be attached to the skin by being exposed to the surface of the non-woven fabric even after it can be made to adhere to the skin via the liquid, or even after the liquid that flows through is absorbed by the absorbent, to express the efficacy of the functional agent Is possible.

[Example using functional agent B]
<Manufacture of non-woven fabric>
(Preparation of functional agent B)
As functional agent B, a dimethyl silicone chain comprising -Si _{(CH 3)} 2 O-, and _{- (C 2 H 4 O)} - consists POE chain comprising the terminal group of the POE chain is a methyl group _(CH 3) A polyoxyethylene (POE) modified dimethyl silicone (KF-6015 manufactured by Shin-Etsu Chemical Co., Ltd.) having a modification ratio of 20%, a polyoxyethylene addition mole number of 3, and a weight average molecular weight of 4000 was used. This polyoxyethylene (POE) modified dimethyl silicone had a solubility of less than 0.0001 g in deionized water and an expansion coefficient of 28.8 mN / m for a liquid having a surface tension of 50 mN / m. In addition, the viscosity was 163 cps.

(Example 4)
A card web is formed by the card method using an eccentric core-sheath composite heat-fusible fiber consisting of a denier 1.2 dtex, a core: polyethylene terephthalate (PET), a sheath: polyethylene (PE), and a mass ratio of 50/50 PET / PE. A functional agent B was applied by flexo-coating on the entire surface of the hot-air-blown surface of an air-through nonwoven fabric (first fiber layer) having a basis weight of 18 g / m ² which was manufactured by hot-air treatment using an air-through heat treatment machine and sheeted.
Using a side-by-side composite latent crimpable fiber consisting of polyethylene and polypropylene with a fineness of 2.3 dtex on the surface of the air through nonwoven fabric (first fiber layer) coated with the functional agent B, a basis weight of 22 g / g The m ² fiber web (second fiber layer) is laminated, and ultrasonic embossing is performed from the fiber web (second fiber layer) side in the same embossing pattern as in Example 1 described in JP-A-2015-186543. The As a result, a concave joint for fusion-bonding the non-woven fabric and the fiber web was formed.
Thereafter, hot air at a temperature of 110 ° C. was sprayed for 10 seconds in the thickness direction from the upper side of the fiber web side. As a result, in the region between the concave joints, the latent crimpable fibers of the fiber web are crimped, and the fiber web is shrunk and the non-woven fabric is protruded in a convex shape to form a single non-woven fabric. woven fabric was obtained according to example 4 of the m ^2. The obtained non-woven fabric was cut into 225 mm long × 70 mm wide, and used as a top sheet according to Example 4.
In addition, 0.4 mass% of the hydrophilizing agent was apply | coated with respect to the fiber mass to the raw material nonwoven fabric and raw material fiber web which were used. The composition of the applied hydrophilizing agent is as follows.
・ Alkyl phosphate ester potassium salt (Kao Co., Ltd., potassium hydroxide neutralized product of gripper 4131): 25% by mass
-Dialkyl sulfosuccinate sodium salt (manufactured by Kao Corporation, Perex OT-P): 10% by mass
-Alkyl (stearyl) betaine (manufactured by Kao Corporation, Anthol 86B): 15% by mass
・ Polyoxyethylene (addition number of moles: 2) stearylamide (Amizole SDE, manufactured by Kawaken Fine Chemicals Co., Ltd.): 30% by mass
・ Polyoxyethylene / polyoxypropylene modified silicone [Shin-Etsu Chemical Co., Ltd., X-22-4515]: 20% by mass

  The ratio of the functional agent B to the total fiber mass of the surface sheet was 0.4% by mass, and the ratio of the functional agent B to the fiber mass of the first fiber layer was 0.9% by mass.

Next, the surface sheet is removed from the sanitary napkin (Kao Co., Ltd .: Laurie F 22.5 cm, made in 2017), and instead, the surface sheet according to Example 4 is replaced with the non-coated side of the first fiber layer. It was stacked on top. During lamination, a hot melt adhesive was intermittently applied and joined between the surface sheet and the absorber in a summit shape so that the coating basis weight was 4.0 g / m ² . Furthermore, by sealing and fixing the periphery, a sanitary napkin sample according to Example 4 was obtained.

(Examples 5 to 7)
The sanitary napkin samples according to Examples 5 to 7 were obtained in the same manner as Example 4, except that the ratio of the coating liquid to the fiber mass of the first fiber layer was changed to the values shown in Table 2.

(Comparative example 3)
A sanitary napkin sample according to Comparative Example 3 was obtained in the same manner as Example 4, except that the functional agent was not applied.

(Comparative example 4)
A nonwoven fabric with a basis weight of 74 g / m ² was obtained in the same manner as in Example 4 except that the functional agent was not applied. Thereafter, the functional agent B was applied to the entire net surface of the first fiber layer by a flexo coating method to obtain a sanitary napkin sample according to Comparative Example 4. The ratio of the functional agent B to the total fiber mass of the surface sheet according to Comparative Example 4 was 0.4% by mass, and the ratio of the functional agent B to the fiber mass of the first fiber layer was 0.9% by mass.

<Evaluation of surface sheet>
(Remaining volume of surface sheet)
On the surface of each sanitary napkin sample, an acrylic plate having a transmission hole with an inner diameter of 1 cm was stacked, and a constant load of 100 Pa was applied to the napkin. Under such a load, 6.0 g of simulated menstrual blood corresponding to menstrual blood was poured from the permeation hole of the acrylic plate at a speed of 6 g / sec. 60 seconds after the simulated menstrual blood was poured, the acrylic plate was removed. Next, the mass (W2) of the non-woven fabric was measured, and the difference (W2-W1) with the mass (W1) of the non-woven fabric before pouring the simulated menstrual blood, which was measured in advance, was calculated. The above operation was performed 3 times, and the average value of 3 times was defined as the liquid remaining amount (mg). The amount of remaining liquid is an indicator of how much the wearer's skin gets wet, and the smaller the amount of remaining liquid, the better the result.
The simulated menstrual blood was adjusted to a viscosity of 8.0 cps in horse-defibrillated blood manufactured by Japan Biotest Laboratories Co., Ltd. Specifically, it was adjusted under the condition of 30 rpm with a TVB10 viscometer of Toki Sangyo Co., Ltd. When the horse defibrinated blood is left to stand, high viscosity parts (such as red blood cells) precipitate and low viscosity parts (plasma) remain as supernatant. The mixing ratio of the portion was adjusted to be 8.0 cps.

(Liquid length of surface sheet)
As the test apparatus, one having a mounting portion in which the mounting surface of the test sample was inclined 45 ° with respect to the horizontal plane was used. Each sanitary napkin sample was placed on the placement unit with the top sheet facing upward. On the surface of each sanitary napkin sample, 0.5 g of simulated blood was dropped at a rate of 0.1 g / sec. The distance from the point at which liquid was first applied to the surface sheet to the point at which the test liquid was drawn into the surface sheet and stopped flowing was measured. In addition, the simulated blood used was adjusted by the same method as the measurement of the amount of remaining liquid of the surface sheet. The above operation was performed 3 times, and the average value of 3 times was defined as the liquid flow length (mm). The liquid flow length is an index of how easily the liquid flows on the surface without being absorbed by the test sample and leaks easily at the time of mounting. The shorter the liquid flow length, the higher the evaluation.

(Touch of the surface of the skin contact side of the front sheet)
Fix each sanitary napkin sample to a scale (electromagnetic weighing: GX-6100 manufactured by Kensei Kogyo Co., Ltd.) so that the surface sheet faces the front, and apply a load of 2 to 3 kg to the surface sheet of the index finger and the middle finger The sample was reciprocated 40 times over 10 cm in the longitudinal direction of the sanitary napkin sample. Thereafter, when the forefinger and the middle finger are rubbed against the belly of the thumb, and the comparative example 3 (without functional agent) is “5” and the comparative example 4 (functional agent is coated on the surface) is “2” as a standard. The touch of the test sample was evaluated by the following 1 to 5: The average value of a total of 4 adults (2 males and 2 females) was used as the evaluation value for the prevention of touch. The higher the score, the better the touch.
5: Do not feel stickiness (equivalent to comparative example 3)
4: Do not feel sticky very much (I do not feel it, but I feel the difference from Comparative Example 3)
3: Do not feel sticky (somewhat, but considerably weaker than Comparative Example 4)
2: feel a little stickiness (equivalent to comparative example 4)
1: I feel stickiness clearly (I feel more than Comparative Example 4)

  From Table 2, compared with Comparative Examples 3 and 4, the sanitary napkin samples of Examples 4 to 7 are excellent in the touch of the surface sheet while maintaining the liquid residue reduction effect by the functional agent, and the liquid flow length of the surface sheet It can be seen that it was possible to shorten

[Example of line contamination of middle layer coated non-woven fabric, example of feeling of discomfort feeling reduction]
<Manufacture of non-woven fabric>
(Example 8)
Polyoxyethylene (POE) modified dimethyl silicone (Shin-Etsu Chemical Co., Ltd.) to PET / PE air through non-woven fabric (core: PET, sheath: PE (mass ratio 50: 50), 1.2 dtex, 18 g / m ² , 900 mm width) KF-6015) was applied with a flexo coater at 0.62 g / m < ² >. Thereafter, a web (22 g / m ² , 900 mm width) consisting of PP / PE fibers (side-by-side, weight ratio 50: 50, 2.3 dtex of PP, PE) is heat embossed (emboss pattern is disclosed in JP-A It integrated with the coated surface side similarly to Example 1 as described in 2015-186543 gazette.

(Reference Example 1)
Polyoxyethylene (POE) modified dimethyl silicone (Shin-Etsu Chemical Co., Ltd.) to PET / PE air through non-woven fabric (core: PET, sheath: PE (mass ratio 50: 50), 1.2 dtex, 18 g / m ² , 900 mm width) After applying 0.62 g / m ^{2 of} KF-6015) manufactured by a flexo coating apparatus, it is taken up as it is, and the same nonwoven fabric is redrawn while PP / PE fiber (side by side, PP, PE weight ratio 50: The web (22 g / m ² , 900 mm width) consisting of 50 and 2.3 dtex is heat-embossed (the embossing pattern is the same as in Example 1 described in JP-A-2015-186543) and integrated on the coated side Turned

<Evaluation of non-woven fabric>
(touch)
The nonwoven fabric of Example 8 had no transfer of the functional agent detected as a sense of incongruity such as machine oil remaining on the fingertips, both sides of the nonwoven fabric being rubbed on the surface after rubbing the surface with the fingertips. In the nonwoven fabric of Example 1, the non-coated surface of the PET / PE air through nonwoven fabric was subjected to finger tip rubbing after the surface was rubbed with a finger tip to detect. There was a sense of discomfort similar to the machine oil remaining at the fingertips.
(Line contamination)
In the non-woven fabric production process of Example 8, no coating liquid adhesion to the transport device was observed after lamination of the web made of PP / PE fibers, but in the non-woven fabric production process of Reference Example 1, to PET / PE air through non-woven fabric After the application of the coating, the part coming into contact with the coated surface from winding up, the part coming out from the air-through nonwoven fabric once wound up and coming into contact with the coated / non-coated surface until laminated with the PP / PE fiber web, PP Even after lamination with a web of PE / PE fiber, oil film adhesion to a portion in contact with the non-coated surface of the PET / PE air through nonwoven fabric was confirmed.

  As mentioned above, it turned out that line contamination can be prevented by stopping a functional agent in the middle of a nonwoven fabric, without going through a winding process. Also, it was found that even if the same amount was applied to non-woven fabric, it would not be detected when touched.

Claims (15)

There are more functional agents inside than the outermost surface,
The functional agent is a non-woven fabric having a property of being able to diffuse at least in the thickness direction by passing a liquid.   The non-woven fabric according to claim 1, wherein the functional agent has a property that the amount of the functional agent present on the outermost surface increases after passing through a liquid. A first fiber layer and a second fiber layer laminated to the first fiber layer,
The non-woven fabric according to claim 1, wherein the functional agent is applied to an interface between the first fiber layer and the second fiber layer.   The nonwoven fabric according to any one of claims 1 to 3, wherein the functional agent is a liquid having a solubility of not less than 0.025 g in deionized water.   The nonwoven fabric according to any one of claims 1 to 3, wherein the functional agent is a liquid whose solubility in deionized water is smaller than 0.025 g and whose expansion coefficient to a liquid having a surface tension of 50 mN / m is larger than 0 mN / m. An absorbent article comprising a front sheet, a back sheet, and an absorber disposed between the front sheet and the back sheet,
The absorbent article which used the nonwoven fabric in any one of Claims 1-5 for the said surface sheet. Applying a functional agent on one side of the first fiber layer;
A laminating step of laminating a second fiber layer on the one side of the first fiber layer after the coating step;
Bonding the fibers between the first fiber layer and the second fiber layer after the laminating step to form a nonwoven fabric in which the first fiber layer and the second fiber layer are integrated;
The manufacturing method of the nonwoven fabric which has.   The method for producing a non-woven fabric according to claim 7, wherein the functional agent has a property of being able to diffuse at least in a thickness direction by passing a liquid.   The method for producing a non-woven fabric according to claim 7 or 8, wherein the functional agent is a liquid having a solubility in deionized water of 0.025 g or more.   The method for producing a non-woven fabric according to claim 7 or 8, wherein the functional agent is a liquid whose solubility in deionized water is smaller than 0.025 g and whose expansion coefficient to a liquid having a surface tension of 50 mN / m is larger than 0 mN / m.   The manufacturing method of the nonwoven fabric of Claim 9 or 10 in which the said lamination process is performed, without providing a drying process after the said coating process.   The method for manufacturing a nonwoven fabric according to any one of claims 7 to 11, wherein the laminating step is performed after the coating step without taking up the first fiber layer coated with the functional agent through a winding step.   The method for producing a non-woven fabric according to any one of claims 7 to 12, wherein the bonding step is performed after the laminating step without taking up the first fiber layer and the second fiber layer. The method further includes a first fiber layer forming step of forming the first fiber layer before the coating step,
The method for producing a non-woven fabric according to any one of claims 7 to 13, wherein the coating step is performed after the first fiber layer forming step without taking up the first fiber layer. The method further includes a second fiber layer forming step of forming the second fiber layer before the laminating step,
The method for manufacturing a nonwoven fabric according to any one of claims 7 to 14, wherein the laminating step is performed after the second fiber layer forming step without taking up a winding step of winding the second fiber layer.