JP2003166161A - Wettable nonwoven fabric, method for producing the same and skin wetting sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a wettable nonwoven fabric having excellent impregnating ability of liquid such as water, medicine solution, cosmetic, etc., soft touch on the surface of the nonwoven fabric, excellent handleability in wetting and adhesivity to the skin. <P>SOLUTION: A heat-bonded nonwoven fabric which comprises heat-bondable fibers and in which constituent fibers are mutually bonded by a partial thermo- compression bonding part is prepared. A fiber web containing water-absorbing short fibers having ≤1 dtex fineness is laminated to at least one side of the heat-bonded nonwoven fabric and interlaced to give the wettable nonwoven fabric. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wettable non-woven fabric which is used by impregnating a liquid such as water, a drug solution, or a cosmetic, and more specifically, a moisturizing component, an antiperspirant component for the skin of a human body, The present invention relates to a skin moisturizing sheet suitable for being moistened and washed with a functional agent such as a cleansing ingredient or a cleansing ingredient.

[0002]

2. Description of the Related Art Conventionally, for wet tissues, disposable hand towels, cosmetic sheets, etc., water absorbent fiber webs such as rayon and cotton or fiber webs made by mixing water absorbent fibers and heat-adhesive composite fibers have been used for high pressure water flow. Hydro-entangled nonwovens that have been treated or various nonwovens that have been functionally improved have been proposed. For example, as a single-layer non-woven fabric, Japanese Patent Laid-Open No. 11-49641 proposes a skin-cleaning sheet made of a hydroentangled non-woven fabric having a cellulose fiber content of 50% by weight or more, an average fineness of 3 denier or less, and a reflectance of 45% or more. Has been done.

On the other hand, as a laminated non-woven fabric, Japanese Patent Application Laid-Open No. 3-227442 discloses a synthetic fiber web layer having a monofilament diameter of 0.5 to 5 μm and a monofilament diameter of 3 to 3 for wiper applications.
A wettable non-woven fabric laminated with a 30 μm cellulosic fibrous web has been proposed. Japanese Unexamined Patent Publication No. 11-19015 proposes a nonwoven fabric for a cleaning material, which has a spunbonded nonwoven fabric as a base material, short fiber webs laminated on each other, and arc loops provided on the surface of the nonwoven fabric. Furthermore, the actual exploitation 64-6739
Japanese Patent Laid-Open Publication No. 2003-242242 discloses that at least one surface of a lotion-occlusion layer made of a heat-bonded nonwoven fabric made of a hydrophobic fiber and having a thickness of 2 to 5 mm,
A cosmetic sheet has been proposed in which a surface layer, which is a hydrophilic fiber-based layer, is arranged and integrated with a high-pressure fluid.

Further, as a laminated non-woven fabric suitable for a packaging material and a cover material, Japanese Unexamined Patent Publication (Kokai) No. 4-153351 proposes a non-woven fabric in which a spunbonded non-woven fabric is used as a base material and a cellulosic short fiber web is laminated. . Further, as a laminated non-woven fabric having appropriate air permeability and water resistance suitable for medical use, JP-A-8-170263 proposes a non-woven fabric in which a short fiber web containing hydrophilic fibers is laminated on one surface of a spunbonded non-woven fabric. Has been done.

[0005]

However, the above-mentioned non-woven fabric has the following problems. For example, a water-absorbent fiber web such as rayon or cotton, or a hydroentangled nonwoven fabric obtained by subjecting a water-absorbent fiber and a heat-adhesive composite fiber to a high-pressure water-jet treated fiber web, or JP-A-11-496.
A single-layer nonwoven fabric such as Japanese Patent Publication No. 41 is not only poor in operability when the nonwoven fabric itself is weakened when it is wet and wipes the skin of the human body, but it is also weak in wet strength and poor in dimensional stability, so it is stored in a container. For this reason, when spreading a small folded wet non-woven fabric, it cannot be unfolded well, and the non-woven fabric stretches while it is unfolded, so it cannot be used in its original non-woven form. The function cannot be fully exerted. The above tendency becomes stronger as the amount of the liquid to be impregnated increases and the viscosity of the liquid becomes higher.

In JP-A-3-227442, a nonwoven fabric obtained by a melt blow method, a flash spinning method or the like is used as a synthetic fiber web layer having a single fiber diameter of 0.5 to 5 μm, and therefore the nonwoven fabric itself is dense. Since the structure is too large, it is inferior in the entanglement property with the cellulosic fibers, and may cause fuzz during use. Furthermore, single fiber diameter 0.5 to 5 μ
In the synthetic fiber web layer of m, the non-woven fabric itself has no stiffness,
It is impossible to reinforce the decrease in strength of the cellulosic fibrous web when it is wet, which causes deformation during handling. In Japanese Laid-Open Patent Publication No. 11-19015, in order to provide an arcuate loop on the surface of the non-woven fabric, not the water-absorbing fibers such as rayon short fibers having a good entanglement property but the polyester fibers having a poor entanglement property are positively used. Poor impregnation. In Japanese Utility Model Laid-Open No. 64-6739, since a heat-bonded non-woven fabric made of hydrophobic fiber and having a thickness of 2 to 5 mm is adopted, the non-woven fabric itself has a large resilience, and the adhesion to the irregularities of the human body and the wetting Poor handleability when sticking or wiping a non-woven fabric onto the skin. Furthermore, since the surface layer also uses rayon fibers having a fineness of 1 to 5 denier, it has poor adhesion to the skin and cannot efficiently transfer a liquid to the skin (liquid transferability).

Further, in JP-A-4-153351 and JP-A-8-170263, no investigation is made as a wettable non-woven fabric which is used by being impregnated with a liquid such as water, a chemical solution, or a cosmetic. Therefore, the non-woven fabric is excellent in liquid impregnation property, the tactile feel of the non-woven fabric surface is soft, and suppresses the fatigue of the non-woven fabric when the liquid is impregnated into a wet state, and it is easy to take out from the container and after taking out. When unfolding a folded nonwoven fabric, it is possible to obtain a wettable nonwoven fabric and a skin-wetting sheet that have excellent handleability such as nonwoven fabric openability and excellent adhesiveness to skin such as skin sticking property, skin wipeability, and liquid transfer to skin. The reality is not.

[0008]

In order to solve the above-mentioned problems, a heat-bonded nonwoven fabric joined by a partial thermocompression bonding portion,
By laminating a fibrous web containing a water-absorbing short fiber having a desired fineness, to form a entangled composite nonwoven fabric,
The inventors have found that a wettable nonwoven fabric which is excellent in liquid impregnation property, has a soft texture on the surface of the nonwoven fabric, has excellent handleability when wet, and has excellent adhesion to the skin, and has reached the present invention. That is, the wettable nonwoven fabric of the present invention contains a heat-adhesive fiber, and at least one surface of the heat-bonded nonwoven fabric in which the constituent fibers are joined together by the partial thermocompression bonding part, a water-absorbing short fiber having a fineness of 3.5 dtex or less. A composite non-woven fabric in which fibrous webs containing 90 mass% or more are laminated and entangled, and 20 mass% or more of the water absorbing short fibers having a fineness of 1 dtex or less are contained in the fibrous web. Is configured.

In the fibrous web, the fineness is 0.5 dt
20% by mass or more of water-absorbing short fibers (hereinafter referred to as water-absorbing short fibers (F)) in the range of ex or more and 1 dtex or less, 8
Included in the range of 0 mass% or less, the fineness exceeds 1 dtex,
20% by mass or more and 80 mass% of water-absorbing short fibers (hereinafter referred to as water-absorbing short fibers (R)) having a range of 3.5 dtex or less
%, The water-absorbing short fibers (R) give the nonwoven fabric an appropriate elasticity, and the water-absorbing short fibers (F) provide flexibility in touch, liquid impregnation and adhesion to the skin. Can be added, which is preferable.

The official moisture regain of the water-absorbent short fibers is 8
% Or more, the liquid impregnation amount is about 6 with respect to the mass of the nonwoven fabric.
It can be impregnated with more than 00 mass%, and is excellent in impregnation property even if the viscosity of the liquid is high, which is preferable.

The heat-bondable fiber has a fineness of 1 dtex or more and 5
Hydrophobic synthetic fibers in the range of dtex or less, and when 50 mass% or more is contained in the heat-bonded non-woven fabric, the strength of the non-woven fabric is not significantly decreased and the tenacity of the non-woven fabric is large. It is preferable that not only the above-mentioned property can be suppressed and the handling property is excellent, but also the entanglement property with the water-absorbing short fibers is excellent. Further, when the heat-adhesive fiber is a hydrophobic synthetic short fiber having a fiber length in the range of 25 mm or more and 100 mm or less, it has an appropriate bulkiness compared to the long fiber and is excellent in entanglement with the water-absorbing short fiber. ,preferable.

The wettable non-woven fabric of the present invention contains a heat-adhesive fiber, and a heat-bonded non-woven fabric in which constituent fibers are joined together by partial thermocompression bonding is prepared, and the fineness is 3. 90mass of water-absorbing short fibers with a dtex of 5 dtex or less
% Or more of the water-absorbing short fibers, and the fineness of the water-absorbing short fibers having a fineness of 1 dtex or less is laminated in the fiber web at 20 mass% or more, and a water stream is jetted from the fiber web surface side to form fibers. After being entangled, it can be produced by drying at a temperature lower than the temperature at which the heat-adhesive fiber melts.

In the above heat-bonded nonwoven fabric, the basis weight is 15 g /
It is in the range of m ² or more and 70 g / m ² or less, the thickness under a load of 2.94 cN / cm ² is 0.8 mm or less, and the tensile strength of the nonwoven fabric in the machine direction and the transverse direction (according to JIS-L-1096). )
Of which the tensile strength in the direction of smaller value is 10N / 5cm
It is preferable to use a nonwoven fabric in the above range, because a wettable nonwoven fabric having excellent handleability such as container removability when wet, and nonwoven fabric openability can be obtained.

A skin moistening sheet obtained by impregnating the wettable non-woven fabric with a liquid such as water, a chemical solution, or a cosmetic has a soft touch, is easy to handle, and has excellent adhesion to the skin. Suitable for wipers and the like. The contents of the present invention will be specifically described below.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The thermoadhesive fiber used in the present invention is not particularly limited as long as the constituent fibers are thermoplastic fibers capable of forming a partial thermocompression bonding portion. For example, polyester fibers such as polyethylene terephthalate and polybutylene terephthalate, nylon 6, nylon 6
One type or two or more types of synthetic short fibers having thermal adhesiveness by heating, such as polyamide type fibers such as No. 6, polyolefin type fibers such as polyethylene and polypropylene, or composite fibers obtained by combining two or more of the above resins. . The shape of the fiber cross section is not particularly limited, and may be circular, irregular, hollow or the like. In particular, fibers having adhesiveness at low temperatures, for example, single fibers such as polyethylene fibers, polypropylene fibers, copolyester fibers, polyethylene / polypropylene, ethylene-propylene copolymer / polypropylene, polyethylene / polyester, copolyester / polyethylene. A composite fiber having a sheath-core type, an eccentric sheath-core type, a side-by-side type, and a split-type fiber cross section made of a combination of terephthalates is excellent in handleability, strength of a nonwoven fabric, and bulkiness, and is preferable.

The fineness of the heat-adhesive fiber is 1 considering the strength of the nonwoven fabric and the entanglement with the water-absorbent fiber web described later.
It is preferably in the range of dtex or more and 5 dtex or less. A more preferable lower limit of the fineness is 1.5 dtex or more. A more preferable upper limit of the fineness is 3 dtex or less. Fineness is 1 dt
When it is less than ex, the heat-bonded nonwoven fabric itself becomes too dense, resulting in inferior entanglement with the fibrous web, and the nonwoven fabric itself tends to be fragile and tends to lose elasticity. Fineness is 5
If it exceeds dtex, the composite non-woven fabric itself becomes hard and the resilience increases, which may result in poor adhesion to the skin.

The content of the heat-bondable fiber in the heat-bonded nonwoven fabric is preferably 50 mass% or more. More preferably, it is 70 mass% or more. If the content of the heat-adhesive fiber is less than 50 mass%, the tensile strength of the nonwoven fabric tends to be lowered, and the handleability such as container removability and nonwoven fabric openability may be poor. Other fibers, for example, natural fibers such as pulp, cotton, silk and wool, regenerated fibers such as rayon, cupra and solvent rayon, acrylic fibers, polyester fibers, as long as the heat-adhesive fibers satisfy the above range. , Polyamide fiber, polyolefin fiber, etc. may be contained.

The heat-adhesive fibers are mixed with other fibers as needed, and then the card web such as parallel card web, semi-random card web, random card web, cross-lay web, criss cross web, or air. A fibrous web such as a laid web or a spunbond web is formed, and constituent fibers are partially joined by a thermocompression bonding portion to form a heat-bonded nonwoven fabric. As the fibrous web, it is preferable to use a card web in consideration of an appropriate bulkiness and entanglement with the water absorbent fibrous web. When used as a card web, the fiber length of the fibers constituting the heat-bonded nonwoven fabric is preferably in the range of 25 mm or more and 100 mm or less. The more preferable lower limit of the fiber length is 30 mm or more.
A more preferable upper limit of the fiber length is 65 mm or less. If the fiber length is less than 25 mm, not only is the card process process inferior, but also an appropriate stiffness cannot be obtained as a composite nonwoven fabric, and if the fiber length exceeds 100 mm, a nonwoven fabric with a high tensile strength and elasticity is obtained. The flexibility of the nonwoven fabric itself may be impaired.

The heat-bonded nonwoven fabric of the present invention is bonded by a partial thermocompression bonding portion. Compared to an air-through non-woven fabric in which the intersections of fibers are adhered to the entire surface, a non-woven fabric with a partial thermocompression bonding portion can suppress the thickness of the non-woven fabric and suppress the resilience of the non-woven fabric, so that unevenness of the human body can be prevented. It tends to adhere closely. The partial thermocompression bonding part can be obtained by pressing the thermocompression bonding part having a predetermined shape against the fiber assembly using a heat roll, ultrasonic wave, or high frequency treatment.
The shape of the thermocompression bonding portion is not particularly limited, and may be any of independent types such as a circle, an ellipse, a rhombus, a cross, a rectangle, and a square, or a continuous type such as a lattice or a line.

The ratio of the thermocompression bonding portion to the surface of the nonwoven fabric (hereinafter referred to as the thermocompression bonding area ratio) is preferably in the range of 8% or more and 25% or less. When the thermocompression bonding area ratio is less than 8%, the number of thermocompression bonding parts is reduced, and sufficient nonwoven fabric strength cannot be obtained. When the thermocompression bonding area ratio exceeds 25%, the ratio of the thermocompression bonding portion to the surface of the non-woven fabric becomes large, and it becomes difficult for the water flow during the hydroentangling treatment described later to penetrate, resulting in entanglement with the fiber web containing the water-absorbing short fibers. Not only is it difficult, but the texture of the nonwoven fabric surface may be disturbed. The area of each thermocompression bonding part (hereinafter referred to as thermocompression bonding area) is preferably in the range of 0.2 mm ² or more and 3 mm ² or less. If the thermocompression bonding area is less than 0.2 mm ² , sufficient nonwoven fabric strength cannot be obtained. When the thermocompression bonding area exceeds 3 mm ² , the thermocompression bonding portion and the fibrous web are difficult to be entangled with each other, which may cause not only entanglement failure but also separation between the nonwoven fabrics.

In addition, the constituent fibers of the non-thermocompression-bonded portion other than the thermocompression-bonded portion may or may not be heat-adhered, and the physical properties of the wettable nonwoven fabric to be obtained are taken into consideration. , May be set appropriately. For example, if the handling of the composite nonwoven fabric is important, the constituent fibers of the non-thermocompression bonded portion may be thermally bonded to increase the nonwoven fabric strength of the thermally bonded nonwoven fabric. If importance is attached to the adhesion of the composite nonwoven fabric to the irregularities of the human body, thermocompression bonding may be performed in a direction in which the constituent fibers of the non-thermocompression bonding portion are not thermally bonded. The thermocompression bonding temperature is preferably in the range of 30 ° C. lower than the temperature at which the heat-adhesive fiber melts or higher and 10 ° C. higher than the temperature at which the heat-adhesive fiber melts. The linear pressure in the thermocompression bonding process is 300N.
The treatment is preferably performed in the range of not less than / cm and not more than 1000 N / cm. If the fiber pressure is less than 300 N / cm, the heat may not be sufficiently transmitted and the strength of the nonwoven fabric may be reduced.
If it exceeds 000 N / cm, it may cause physical deterioration such as tearing (pinhole) in the thermocompression bonding part, and the strength of the non-woven fabric may be reduced. In addition, the thermocompression bonding part becomes hard and the feel of the composite non-woven fabric becomes hard. There is a fear.

The thickness of the heat-bonded nonwoven fabric under a load of 2.94 cN / cm ² is preferably 0.8 mm or less. A more preferable lower limit of the thickness is 0.1 mm or more. A more preferable lower limit of the thickness is 0.2 mm or more. A more preferable upper limit of the thickness is 0.6 mm or less. A more preferable upper limit of the thickness is 0.4 mm or less. If the thickness is too small, it is not possible to suppress the settling of the nonwoven fabric when it is wet, and the strength of the nonwoven fabric may be reduced. 0.8mm thickness
When it exceeds, the resilience of the non-woven fabric itself becomes large, and there is a possibility that the adhesiveness to the skin such as skin sticking property, skin wiping property, and liquid transfer property to the skin is poor.

The basis weight of the heat-adhesive non-woven fabric is preferably 15 g / m ² or more and 70 g / m ² or less. The more preferable lower limit of the basis weight is 20 g / m ² or more. The more preferable upper limit of the basis weight is 40 g / m ² or less. If the basis weight is less than 15 g / m ² , it is not possible to suppress the settling of the nonwoven fabric when wet, and the strength of the nonwoven fabric may be reduced. Weight is 70 g / m ²
When it exceeds, the non-woven fabric itself has a large resilience, there is a possibility that the adhesiveness to the skin such as the skin sticking property, the skin wiping property, and the liquid transfer property to the skin may be deteriorated, and the cost increases.

Of the tensile strengths in the longitudinal direction and the transverse direction (according to JIS-L-1096) of the heat-bonded nonwoven fabric, the tensile strength in the direction having the smaller value is preferably 10 N / 5 cm or more. More preferable lower limit of tensile strength is 15 N
/ 5 cm or more. The more preferable upper limit of tensile strength is 12
It is 0 N / 5 cm or less. If the tensile strength is less than 10 N / 5 cm, it may be stretched or broken during handling after wetting. If the tensile strength is too large, the composite non-woven fabric itself becomes hard, and it may be difficult to adhere to the irregularities of the human body.

Next, the water-absorbing short fibers used for the fibrous web laminated on at least one surface of the heat-bonded nonwoven fabric are not particularly limited as long as they are fibers capable of being impregnated with a liquid such as water, a chemical solution, or a cosmetic material. For example, one kind or two or more kinds of water absorbent short fibers having an official moisture content of 8% or more, such as natural fibers such as pulp, cotton, silk, wool and hemp, regenerated fibers such as rayon, cupra and solvent rayon. Is preferred.

The water absorbent short fibers have a fineness of 3.5 dte.
x or less is used, and 90% by mass or more of the water absorbent short fibers having a fineness of 1 dtex or less among the water absorbent short fibers (hereinafter referred to as water absorbent short fibers (F)) is contained in the fiber web. A composition containing 20 mass% or more is adopted. As a more preferable constitution, the water-absorbing short fiber (F) having a fineness of 0.5 dtex or more and 1 dtex or less is 20 mass% or more,
Contains less than 80 mass% and has a fineness of more than 1 dtex,
20% by mass or more and 80 mass% of water-absorbing short fibers (hereinafter referred to as water-absorbing short fibers (R)) having a range of 3.5 dtex or less
It is contained in the range of not more than%. More preferably, the water absorbent short fibers (F) are 30 mass% or more and 70 mass% or more.
Contains in the following range, fineness exceeds 1.5 dtex, 2.5
30 mass% of water-absorbing short fibers (R) consisting of dtex or less
% And 70 mass% or less.
The content of water-absorbing short fibers in the fibrous web is 90 mass%
When it is less than the above, the ratio of the impregnated liquid on the surface of the nonwoven fabric is small, and the liquid cannot be efficiently transferred to the skin. More preferably, the fibrous web is formed of only water-absorbing short fibers (100 mass%). In addition, within the above range, the fiber web may contain fibers other than the water-absorbing short fibers, for example, hydrophobic synthetic short fibers in a range not exceeding 10 mass%.

If the fineness of the water-absorbent short fibers exceeds 3.5 dtex, the tactile sensation upon contact with the skin tends to become hard, and a tingling sensation is generated on the skin, giving an unpleasant sensation. If the desired amount of the water-absorbing short fibers (F) having a fineness of 1 dtex or less is not contained, the contact area between the water-absorbing short fibers and the skin is small, the adhesion to the skin is poor, and the liquid is efficiently transferred to the skin. I can't. However, since the water-absorbent short fibers (F) having a fineness of 1 dtex or less are very fine fibers, they cannot be said to have good cardability and may disturb the texture of the fiber web. This tendency becomes remarkable when the fineness is less than 0.5 dtex. It is preferable to mix the water-absorbing short fibers (F) and the water-absorbing short fibers (R) together, since the cardability can be remarkably improved and the texture of the fibrous web can be prevented from being disturbed. Furthermore, with only the water-absorbent short fibers (F),
Although the fiber strength may decrease when wet and the non-woven fabric surface may lose its stiffness or be settled, by mixing water-absorbing short fibers (R) having high fiber strength when wet due to the large fineness, the nonwoven fabric It is preferable because it can give an appropriate stiffness to the surface and has excellent abrasion resistance.

The fineness difference between the water absorbent short fibers (F) and the water absorbent short fibers (R) is preferably 0.5 dtex or more. By setting the difference in fineness to 0.5 dtex or more, it is possible to prevent deterioration of abrasion resistance due to deterioration of fiber strength when wet, and deterioration of handleability due to fatigue. In addition, in terms of card passability, the entanglement of fibers becomes good, which is preferable.

As the form of the fiber web of the water-absorbing short fibers, there are used card webs such as parallel card web, semi-random card web, random card web, cross-lay web, criss cross web, and air-lay web. Considering the entanglement between the fibrous web and the heat-bonded nonwoven fabric, it is preferable to use a card web.

Then, the fibrous web is laminated on at least one surface of the heat-bonded nonwoven fabric and entangled and integrated by a known entanglement method to form a composite nonwoven fabric. The fibrous web may be laminated on either one side or both sides of the heat-bonded nonwoven fabric, but it is preferable to laminate the fibrous web on both sides because both sides of the composite nonwoven fabric having the same function can be effectively utilized.
In the case of both sides, the blend of the water-absorbing short fibers may be changed depending on the purpose. Further, in the present invention, a wettable non-woven fabric having a soft touch can be obtained particularly by integrating by hydroentangling treatment. The unit weight of the composite nonwoven fabric of the present invention is 4
It is preferably in the range of 0 g / m ² or more and 150 g / m ² or less. When the basis weight is less than 40 g / m ² , the amount of liquid impregnated becomes small and not only the function as a wet non-woven fabric cannot be fully exerted, but also the handleability such as take-out property and non-woven fabric opening property is poor. This is because when the basis weight exceeds 150 g / m ² , not only the handleability of the user is poor when the wet nonwoven fabric is used, but also the cost becomes high.

Next, the method for producing the wettable nonwoven fabric of the present invention will be described. As an example, the heat-bonded nonwoven fabric described above is prepared, the fiber web containing the water-absorbing short fibers is prepared, and laminated on at least one surface of the heat-bonded nonwoven fabric.
Then, the fibers are entangled with each other by a known entanglement treatment device such as a needle punch device and a water entanglement treatment device. The hydroentangling treatment is preferable from the viewpoint of the texture of the resulting composite nonwoven fabric and the entanglement property of fibers. For example, when using hydroentanglement treatment, water pressure of 2MPa or more and 8MPa or less is obtained from nozzles provided with orifices having a hole diameter of 0.05mm or more and 0.5mm or less at intervals of 0.5mm or more and 2mm or less. The water entanglement treatment may be performed so that the water stream composed of is sprayed at least once from the fiber web surface side. When the fibrous webs are arranged on both sides, it is advisable to spray at least once from both sides.

After the hydroentangling treatment, the non-woven fabric is dried to remove water, but it is necessary to dry the non-woven fabric at a temperature lower than the temperature at which the heat-adhesive fibers constituting the heat-adhesive non-woven fabric are melted. A more preferable drying temperature is a temperature lower by 5 ° C. or more than the temperature at which the heat-adhesive fiber melts. The temperature at which the heat-adhesive fiber melts here means JIS-K-7122 (DS
The melting peak temperature conforming to that of Method C) is used. For those such as amorphous polypropylene and amorphous copolyester where the melting peak is not clear, the molten state of the fiber is observed while raising the atmospheric temperature with a microscope, and the resin flows out. The temperature at which When the drying temperature is higher than the melting temperature of the heat-adhesive fiber, the heat-adhesive fiber may be melted and the texture of the composite nonwoven fabric itself may be hard.

The wettable non-woven fabric thus obtained, depending on the purpose, may be water, a wetting agent such as ethylene glycol or propylene glycol, an alcohol, an antibacterial agent, a fungicide, a chemical such as a fragrance, a moisturizing component, or the like. A desired liquid such as a cosmetic such as an antiperspirant component, a cleansing component, or a cleaning component may be applied by a known method. The impregnation rate of the liquid may be appropriately set according to the purpose, but it is preferably wet in the range of 100 mass% or more and 1500 mass% or less with respect to the mass of the nonwoven fabric. Particularly, according to the wettable nonwoven fabric of the present invention, the amount of the liquid to be impregnated is 600 mass%.
Above, or excellent liquid impregnation in high viscosity liquid,
It suppresses fatigue when wet, has excellent handleability such as container removability and non-woven fabric openability, and has excellent adhesiveness to skin such as skin sticking property, skin wiping property, and liquid transfer property to skin.

Thus, the skin-wetting sheet obtained by impregnating the wettable nonwoven fabric with a liquid such as water, a chemical solution, or a cosmetic has a soft touch, is easy to handle, and has excellent adhesion to the skin. It is suitable for wipers for personal use.

[0035]

EXAMPLES The contents of the present invention will be described below with reference to examples. The thickness of the obtained nonwoven fabric, the strength and elongation of the nonwoven fabric, the texture to the skin when wet, the adhesiveness, and the openability of the nonwoven fabric were measured by the following methods.

[Thickness] Thickness measuring machine (THICKNESS GAUGE model CR manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd.)
-60A), and a load of 2.94 cN per cm ^{2 of} the sample was applied.

[Tensile Strength and Breaking Elongation of Nonwoven Fabric] JIS-
According to L-1096, a sample piece with a width of 5 cm and a length of 15 cm is grasped at a gripping interval of 10 cm, and is stretched at a tension rate of 30 cm / min using a constant-speed extension type tensile tester. Was taken as tensile strength and elongation at break, respectively.

[Feeling and adhesion to skin when wet]
The non-woven fabric was cut into a size of 15 cm × 15 cm, and the feel of a wet non-woven fabric impregnated with 600 mass% of water based on the mass of the non-woven fabric was reciprocated 5 times on the backs of the hands of 5 monitors, and the feel was judged according to the following level. ◯: It is flexible and has a feeling of adhesion. Δ: Normal X: Hard and poor in adhesion.

[Nonwoven fabric openability] A state in which one piece of the wet folded nonwoven fabric folded in six was picked up with one hand and expanded to the original size while swinging vertically and horizontally was judged according to the following level. ◯: The nonwoven fabric could be spread without being deformed. Δ: The nonwoven fabric was slightly stretched. X: The nonwoven fabric is completely stretched.

[Example 1] A polypropylene fiber having a fineness of 2.2 dtex and a fiber length of 51 mm (manufactured by Fiber Visions, T-192) was used as a heat-adhesive fiber to prepare a fiber web with a semi-random card machine, and heat was applied. Crimping temperature 147
℃, thermocompression bonding area 0.79mm ² , thermocompression bonding area ratio 19.7%
Approximately 30 g / m ^{2 with} a circular embossed pattern and a thickness of 0.2
An 8 mm heat-bonded nonwoven fabric was prepared. The tensile strength in the longitudinal direction of the obtained heat-bonded nonwoven fabric was 74 N / 5 cm, and the tensile strength in the transverse direction was 18 N / 5 cm. Further, the longitudinal elongation of the heat-bonded nonwoven fabric was 72%, and the transverse elongation thereof was 90%.

On the other hand, 50% by mass of rayon fiber (manufactured by Daiwabo Rayon Co., Ltd.) having a fineness of 1.7 dtex, a fiber length of 40 mm and an official moisture content of 11% was used as the water absorbent short fiber (R).
As water-absorbing short fibers (F), fineness 0.9 dtex, fiber length 3
While mixing 2 mm and 50 mass% of rayon fiber (manufactured by Daiwabo Rayon Co., Ltd.) having an official moisture content of 11%, using two semi-random card machines to make a fiber web having a basis weight of about 30 g / m ² , Nozzle in which thermal adhesive non-woven fabric is inserted between the exits of two semi-random card machines, laminated with the fibrous web, and then a hydroentangling apparatus is used to provide orifices with a hole diameter of 0.12 mm at intervals of 0.6 mm. To the front side of the fibrous web by injecting a columnar water stream with a water pressure of 4 MPa once, and from the back side with a columnar water stream of a water pressure of 4 MPa once.
The constituent fibers of the fibrous web were entangled and integrated with the fibers constituting the heat-bonded nonwoven fabric. Then, using a hot-air penetrating dryer, the polypropylene fiber was dried at 120 ° C. so that the polypropylene fiber did not melt to obtain a composite nonwoven fabric having a basis weight of about 90 g / m ² to obtain a wettable nonwoven fabric of the present invention.

[Example 2] 70 mass% of the water-absorbing short fibers (R) of Example 1 and 3 of the water-absorbing short fibers (F) of Example 1
A wet nonwoven fabric of the present invention was obtained by the same method as in Example 1 except that 0% by mass was mixed.

[Example 3] 30 mass% of the water-absorbing short fibers (R) of Example 1 and 7 of the water-absorbing short fibers (F) of Example 1
A wet nonwoven fabric of the present invention was obtained by the same method as in Example 1 except that 0% by mass was mixed.

Comparative Example 1 A semi-random card web of 100 mass% of water-absorbent short fibers (R) of Example 1 having a basis weight of about 90 g / m ² was subjected to hydroentangling treatment under the same conditions as in Example 1, It was dried at 120 ° C. using a hot-air penetrating dryer to obtain a rayon nonwoven fabric having a basis weight of about 90 g / m ² .

[Comparative Example 2] A composite non-woven fabric was obtained in the same manner as in Example 1 except that the water absorbing short fibers (R) of Example 1 were changed to 100% by mass.

[Comparative Example 3] 70% by mass of the water-absorbing short fibers (F) of Example 1 was used, and as the hydrophobic compatible short fibers, a polyester having a fineness of 1.5 dtex, a fiber length of 44 mm and an official moisture content of 0.4% was used. A composite non-woven fabric was obtained in the same manner as in Example 1 except that 30 mass% of fiber (manufactured by Toyobo Co., Ltd.) was mixed.

Then, Examples 1 to 3 and Comparative Examples 1 to 1
The physical properties of the non-woven fabric of No. 3 and the weight of the non-woven fabric are 60
Table 1 shows the evaluation results of the skin moistening sheet impregnated with 0 mass%.

[0048]

[Table 1]

The skin moisturizing sheets of Examples 1 to 3 have good curd passing properties, and have a feeling on the skin when moistened.
It was excellent in both adhesiveness and non-woven fabric openability. On the other hand, in Comparative Example 1, since the heat-adhesive non-woven fabric was not laminated, the non-woven fabric was stretched when the non-woven fabric was opened, and since it did not contain the water-absorbing short fibers (F) having a fineness of 1 dtex or less, The texture to the skin was hard and the adhesion was not sufficient. In Comparative Example 2, since the heat-bonded nonwoven fabric was laminated, the nonwoven fabric openability was good, but the texture to the skin when wet was hard and the adhesiveness was not sufficient. In Comparative Example 3, although the water-absorbing short fibers (F) having a fineness of 1 dtex or less were contained, the hydrophobic synthetic short fibers were 30
It contained mass% and had insufficient adhesion to the skin.

[0050]

EFFECTS OF THE INVENTION The wettable nonwoven fabric of the present invention contains a thermoadhesive fiber and has a fineness of 3.5 dtex on at least one surface of the thermoadhesive nonwoven fabric in which the constituent fibers are joined by the partial thermocompression bonding.
Laminating and interlacing fiber webs containing the following water-absorbing short fibers in an amount of 90 mass% or more, and the water-absorbing short fibers having a fineness of 1 dtex or less in the fiber web containing 20 mass% or more. With the excellent liquid impregnation property, the non-woven fabric surface has a soft touch, suppresses settling when wet, is excellent in handleability such as container take-out property, non-woven fabric openability, skin sticking property, skin wiping property, A wettable non-woven fabric having excellent adhesiveness to the skin such as liquid transfer to the skin can be obtained. In particular, it is useful for an amount of liquid to be impregnated of 600 mass% or more, or for a high viscosity liquid.

The skin-wetting sheet obtained by impregnating the wettable nonwoven fabric with a liquid such as water, a chemical solution, or a cosmetic has a soft touch, is excellent in handleability, and is excellent in adhesion to the skin. It is suitable for personal use such as moisturizing the skin of a human body or the like with a functional agent such as a moisturizing component, an antiperspirant component, a cleansing component, or washing.

Continued front page    F term (reference) 4F100 AJ05 AK01A AK07 BA02                       BA03 BA10B DG03B DG06B                       DG15A DG18A DG18B EC03A                       EC092 EJ862 GB71 HB21                       JA13A JB05 JB06A JD15B                       JK02 JL12A YY00A YY00B                 4L047 AB02 AB07 BA04 CA02 CA05                       CB01 CB10 CC03 CC16

Claims (8)

[Claims] 1. A water-absorbing short fiber having a fineness of 3.5 dtex or less is formed on at least one surface of a heat-bonding nonwoven fabric containing heat-bonding fibers, in which constituent fibers are joined by partial thermocompression bonding.
A composite non-woven fabric obtained by laminating and entangled a fibrous web containing at least mass%, wherein the water absorbing short fibers having a fineness of 1 dtex or less among the water absorbing short fibers are contained in the fibrous web.
Wettable nonwoven fabric containing more than mass%. 2. The fiber web has a fineness of 0.5 dtex.
The water absorption short fibers in the range of 1 dtex or less to 20 ma
Included in the range from ss% to 80mass% and the fineness is 1dt
The wettable non-woven fabric according to claim 1, which contains water-absorbing short fibers in a range of more than ex and 3.5 dtex or less in a range of 20 mass% or more and 80 mass% or less. 3. The official moisture regain of the water-absorbent short fibers is 8%.
It is above, The wettable nonwoven fabric of Claim 1 or 2. 4. The heat-adhesive fiber has a fineness of 1 dtex or more and 5 dtex.
The wettable non-woven fabric according to claim 1, which is a hydrophobic synthetic fiber having the following range and is contained in the heat-bonded non-woven fabric in an amount of 50 mass% or more. 5. The heat-adhesive fiber has a fiber length of 25 mm or more and 10
The wettable nonwoven fabric according to claim 1 or 4, which is a hydrophobic synthetic short fiber having a range of 0 mm or less. 6. A thermoadhesive non-woven fabric containing thermo-adhesive fibers, wherein constituent fibers are joined together by partial thermo-compression bonding, and a fineness of 3.5 dtex is provided on at least one side of the thermo-adhesive non-woven fabric.
20 water-absorbing short fibers containing 90 mass% or more of the following water-absorbing short fibers and having a fineness of 1 dtex or less among the water-absorbing short fibers
Manufacture of a wettable non-woven fabric in which fibrous webs containing more than mass% are laminated, a water flow is jetted from the fibrous web surface side to entangle the fibers, and then dried at a temperature lower than the temperature at which the heat-adhesive fibers melt Method. 7. The basis weight of the heat-bonded nonwoven fabric is in the range of 15 g / m ² or more and 70 g / m ² or less, the thickness under a load of 2.94 cN / cm ² is 0.8 mm or less, and the longitudinal direction of the nonwoven fabric and The method for producing a wettable non-woven fabric according to claim 6, wherein the tensile strength in the direction of smaller value is 10 N / 5 cm or more among the tensile strength in the transverse direction (according to JIS-L-1096). 8. A skin moistening sheet obtained by impregnating the wettable nonwoven fabric according to claim 1 with a liquid.