JP6016769B2 - Nonwoven fabric and method for producing nonwoven fabric - Google Patents

Description

  The present invention relates to a nonwoven fabric and wet wipes obtained by impregnating the nonwoven fabric with a liquid.

  Patent Documents 1 to 3 describe a method for producing a bulky papermaking by drying a wet papermaking sheet containing foam particles uniformly dispersed and held in a pulp fiber layer with a dryer and foaming the foam particles. Yes.

JP-A-5-339898 JP-A-10-88495 JP 2000-34695 A

Since the nonwoven fabric manufactured by the conventional paper manufacturing method described in Patent Documents 1 to 3 has expanded particles on the surface, the surface strength is low. Therefore, it is not suitable as a wet wipe that requires a surface strength that can withstand the frictional force generated during use. Further, since the particles existing on the surface are broken or dropped by the frictional force generated during use, it is not suitable as wet wipes.
Then, an object of this invention is to provide the nonwoven fabric suitable as wet wipes, and wet wipes using the same.

In order to solve the above-mentioned problem, the present invention provides a third hydrophilic fiber-containing layer provided between the first and second hydrophilic fiber-containing layers provided in the outermost layer, and a third hydrophilic fiber-containing layer provided in the third and second hydrophilic fiber-containing layers. A non-woven fabric having a hydrophilic fiber-containing layer, wherein the first and second hydrophilic fiber-containing layers do not contain thermally expanded hollow particles, and the third hydrophilic fiber-containing layer is thermally expanded hollow The particles contain 5% by mass or more based on the total mass of the third hydrophilic fiber-containing layer, the bulk density of the nonwoven fabric is less than 0.10 g / cm ³ , and the water absorption capacity of the nonwoven fabric is 350 times or more. A nonwoven fabric is provided, and wet wipes obtained by impregnating the nonwoven fabric with a liquid are provided.

  ADVANTAGE OF THE INVENTION According to this invention, the nonwoven fabric suitable as wet wipes and wet wipes using the same are provided.

FIG. 1 is a cross-sectional view showing an embodiment of the nonwoven fabric of the present invention. FIG. 2 is a schematic view for explaining the thermally expandable particles. Drawing 3 is a figure for explaining one embodiment of the nonwoven fabric manufacturing device used for the manufacturing method of the nonwoven fabric of the present invention. FIG. 4 is a diagram illustrating an example of a high-pressure water flow nozzle. FIG. 5 is a diagram illustrating an example of a nozzle hole of a high-pressure water flow nozzle. FIG. 6 is a diagram for explaining the principle that fibers of a paper layer (paper layer corresponding to the first hydrophilic fiber-containing layer) are entangled by a high-pressure water stream. FIG. 7 is a cross-sectional view in the width direction of a paper layer (paper layer corresponding to the first hydrophilic fiber-containing layer) on which a high-pressure water stream has been jetted. FIG. 8 is a schematic view for explaining a paper layer corresponding to the third hydrophilic fiber-containing layer. FIG. 9 is a cross-sectional view in the width direction of a laminate of two paper layers (a paper layer corresponding to the first hydrophilic fiber-containing layer and a paper layer corresponding to the third hydrophilic fiber-containing layer). FIG. 10 shows three paper layers (a paper layer corresponding to the first hydrophilic fiber-containing layer, a paper layer corresponding to the third hydrophilic fiber-containing layer, and a paper layer corresponding to the second hydrophilic fiber-containing layer). Is a cross-sectional view in the width direction of the laminate (before high-pressure steam injection). FIG. 11 is a diagram illustrating an example of a high-pressure steam nozzle. FIG. 12 is a diagram illustrating an example of a nozzle hole of a high-pressure steam nozzle. FIG. 13 shows three paper layers (a paper layer corresponding to the first hydrophilic fiber-containing layer, a paper layer corresponding to the third hydrophilic fiber-containing layer, and a paper layer corresponding to the second hydrophilic fiber-containing layer) Is a cross-sectional view in the width direction of the laminate (after high-pressure steam injection). FIG. 14 is a cross-sectional view showing another embodiment of the nonwoven fabric of the present invention.

Hereinafter, the nonwoven fabric and wet wipes of this invention are demonstrated.
Various parameters relating to the nonwoven fabric of the present invention are measured as follows.
Conditioned nonwoven fabrics are used to measure various parameters of the nonwoven fabrics. Conditioning of the nonwoven fabric is carried out by storing the nonwoven fabric in a dry state for 24 hours or longer in a standard state (temperature 23 ± 2 ° C., relative humidity 50 ± 5%). The non-woven fabric in a dry state is a non-woven fabric having a moisture content of usually 12% or less, preferably 10% or less, and more preferably 8% or less.

[Moisture percentage]
The measurement of the moisture content (%) of a nonwoven fabric is implemented as follows.
About ten test pieces (length 30 cm × width 30 cm) cut out from the nonwoven fabric, weight before drying (W1) and weight after drying for 60 minutes at 105 ° C. ± 2 ° C. according to JIS P8127 (W2) ) And the average value of the moisture content of 10 test pieces calculated based on the moisture content = (W1−W2) / W1 × 100 (%) is defined as the moisture content of the nonwoven fabric. In the drying process, a dryer that can maintain the temperature at 105 ° C. ± 2 ° C. and appropriately replace the air is used.

[The bulk density]
The non-woven fabric bulk density (g / cm ³ ) is calculated based on the non-woven fabric bulk density (g / cm ³ ) = non-woven fabric basis weight (g / m ² ) / non-woven dry thickness (mm) × 10 ^−3. Is done. In addition, the measurement of the basic weight of a nonwoven fabric and the thickness at the time of drying is described below.

[Basis weight]
The basis weight (g / m ² ) of the nonwoven fabric is measured as follows.
The mass of three test pieces (10 mm × 10 mm) cut out from the nonwoven fabric after conditioning was measured with a direct balance (for example, electronic balance HF-300 manufactured by Kensei Kogyo Co., Ltd.). Let the mass per unit area (g / m < ² >) of the nonwoven fabric computed from the average value of mass be a basic weight of a nonwoven fabric.
In addition, regarding the measurement of the basis weight of the nonwoven fabric, the measurement conditions described in ISO 9073-1 or JIS L 1913 6.2 are adopted for the measurement conditions not particularly specified above.

[Dry thickness]
The measurement of the thickness (mm) at the time of drying of a nonwoven fabric is implemented as follows.
Using thickness gauges (for example, FS-60DS manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd., measuring element area 15 cm ² ), three different parts of the nonwoven fabric after conditioning (when using thickness gauge FS-60DS, each part Is 15 cm ² ) at a constant pressure of 3 g / cm ² , the thickness of each part after 10 seconds is measured, and the average thickness of the three parts is taken as the thickness when the nonwoven fabric is dried.

[Thickness when wet]
The measurement of the wet thickness (mm) of the nonwoven fabric is performed as follows.
After impregnating three test pieces (length 10 mm × width 10 mm) cut out of the condition-adjusted non-woven fabric with 150% of their own weight of distilled water (the weight of the test piece after impregnation is the test piece before impregnation) For 10 minutes). Next, using a thickness meter (for example, FS-60DS manufactured by Daiei Scientific Instruments Co., Ltd., measuring element area 15 cm ² ), when using a predetermined portion of each test piece (when using the thickness meter FS-60DS, the area of the portion) Is 15 cm ² ) at a constant pressure of 3 g / cm ² , and the thickness after 10 seconds at the site is measured. The average value of the thicknesses of the three test pieces is defined as the wet thickness of the nonwoven fabric.

[Water absorption ratio]
The measurement of the water absorption ratio (%) of the nonwoven fabric is carried out as follows.
The mass (g) before water absorption of five test pieces (length 100 mm × width 100 mm) cut out from the nonwoven fabric after condition adjustment is measured. After each test piece is immersed in distilled water for 1 minute, it is drained by being left on a net (80 mesh) for 1 minute, and the mass of the test piece after draining is measured. The water absorption ratio (%) of the test piece = the mass of the test piece after draining / the mass of the test piece before water absorption × 100. Let the average value of the absorption capacity of five test pieces be the water absorption capacity of the nonwoven fabric.

[Maximum tensile strength when dry]
The measurement of the maximum tensile strength (N / 25 mm) at the time of drying of a nonwoven fabric is implemented as follows.
A test piece (length 150 mm × width 25 mm) cut out from the nonwoven fabric after condition adjustment is attached to a tensile tester (Autograph AGS-1kNG manufactured by Shimadzu Corporation) at a spacing of 100 mm, and the test piece is pulled at a pulling speed of 100 mm / min. A load (maximum point load) is applied until is cut, and the maximum tensile strength when the test piece is dried is measured. The average value of the maximum tensile strength when the three test pieces are dried is defined as the maximum tensile strength when the nonwoven fabric is dried.

[Maximum tensile strength when wet]
The measurement of the maximum tensile strength (N / 25 mm) when the nonwoven fabric is wet is performed as follows.
After impregnating 150% of the weight of distilled water into a test piece (length 150 mm × width 25 mm) cut out from the nonwoven fabric after conditioning (the weight of the test piece after impregnation is the mass of the test piece before impregnation) 250%), attached to a tensile tester (Shimadzu Autograph AGS-1kNG) at a grip interval of 100 mm, and applying a load (maximum point load) until the test piece is cut at a tensile speed of 100 mm / min, Measure the maximum tensile strength of the specimen when wet. The average value of the maximum tensile strength when the three test pieces are wet is defined as the maximum tensile strength when the nonwoven fabric is wet.

  Regarding the maximum tensile strength when the nonwoven fabric is dry and wet, “N / 25 mm” means the maximum tensile strength (N) per 25 mm width in the longitudinal direction of the nonwoven fabric. A test piece whose length direction matches the MD of the nonwoven fabric is used for measurement of the tensile strength of the nonwoven fabric MD, and a test piece whose length direction matches the CD of the nonwoven fabric for measurement of the tensile strength of CD of the nonwoven fabric. Is used. Regarding the measurement of the maximum tensile strength at the time of drying and wetting, the measurement conditions described in ISO 9073-3 or JIS L 1913 6.3 are adopted for the measurement conditions not particularly specified above.

One aspect (Aspect 1A) of the nonwoven fabric of the present invention is the first and second hydrophilic fiber-containing layers provided in the outermost layer and the first and second hydrophilic fiber-containing layers provided in the first. The first and second hydrophilic fiber-containing layers do not contain thermally expanded hollow particles, and the third hydrophilic fiber-containing layer has a thermal expansion. The hollow particles are contained in an amount of 5% by mass or more based on the total mass of the third hydrophilic fiber-containing layer, the bulk density of the nonwoven fabric is less than 0.10 g / cm ³ , and the water absorption capacity of the nonwoven fabric is 350 times or more. It is a non-woven fabric.

  In the nonwoven fabric of aspect 1A, since the first and second hydrophilic fiber-containing layers provided in the outermost layer do not contain thermally expanded hollow particles, the surface strength of the nonwoven fabric is reduced due to the presence of thermally expanded hollow particles. Can be prevented. For this reason, the nonwoven fabric of aspect 1A can have the surface strength which can endure the frictional force which arises when it is used as wet wipes (for example, at the time of wiping off). Therefore, the nonwoven fabric of aspect 1A is suitable as wet wipes.

  In the nonwoven fabric of aspect 1A, the thermally expanded hollow particles are not contained in the first and second hydrophilic fiber-containing layers provided in the outermost layer, but between the first and second hydrophilic fiber-containing layers. Since it is contained in the provided third hydrophilic fiber-containing layer, the thermally expanded hollow particles can be protected from external force. For this reason, the nonwoven fabric of aspect 1A can prevent destruction, dropout, and the like of thermally expanded hollow particles due to frictional force generated when used as wet wipes (for example, during wiping). Therefore, the nonwoven fabric of aspect 1A is suitable as wet wipes.

In the nonwoven fabric of Aspect 1A, the third hydrophilic fiber-containing layer contains thermally expanded hollow particles in an amount of 5% by mass or more based on the total mass of the third hydrophilic fiber-containing layer. The nonwoven fabric has a bulk density of less than cm ³ and a nonwoven fabric water absorption of 350 times or more. For this reason, while the nonwoven fabric of aspect 1A has a bulky and soft texture, it can have water absorption, water retention, and high detergency resulting from these. Therefore, the nonwoven fabric of aspect 1A is suitable as wet wipes, especially as wet wipes for people such as wiping wipes.

In the nonwoven fabric of aspect 1A, the third hydrophilic fiber-containing layer contains 5% by mass or more of thermally expanded hollow particles based on the total mass of the third hydrophilic fiber-containing layer, and the nonwoven fabric has a bulk density. By being less than 0.10 g / cm ³ , sufficient gas (gas present in the hollow particles and gas present in the voids of the nonwoven fabric) is included in the nonwoven fabric. For this reason, in the nonwoven fabric of aspect 1A, the temperature fall after heating is moderate, and the heated state is easily maintained. Therefore, the nonwoven fabric of aspect 1A is suitable as a wet wipe that has been heated, particularly as a wet wipe for infants and elderly people who are sensitive to temperature changes.

  In a preferred embodiment (embodiment 2A) of the nonwoven fabric of Embodiment 1A, the amount of thermally expanded hollow particles contained in the third hydrophilic fiber-containing layer is 30 masses based on the total mass of the third hydrophilic fiber-containing layer. % Or less. As the amount of the thermally expanded hollow particles contained in the third hydrophilic fiber-containing layer increases, the strength of the nonwoven fabric decreases, but the thermally expanded hollow particles contained in the third hydrophilic fiber-containing layer If the amount is 30% by mass or less based on the total mass of the third hydrophilic fiber-containing layer, the nonwoven fabric can maintain sufficient strength. For this reason, the nonwoven fabric of aspect 2A is hard to tear when it is used as wet wipes (for example, during wiping). Therefore, the nonwoven fabric of aspect 2A is suitable as wet wipes.

  In a preferred embodiment (embodiment 3A) of the nonwoven fabric of Embodiment 2A, the maximum tensile strength when wet is 1.5 N / 25 mm or more. When the nonwoven fabric of aspect 3A is used as wet wipes (for example, at the time of wiping), it is difficult to tear. Therefore, the nonwoven fabric of aspect 3A is suitable as wet wipes. “N / 25 mm” means the maximum tensile strength (N) per 25 mm width in the plane direction of the nonwoven fabric, and the plane direction of the nonwoven fabric is, for example, orthogonal to the transport direction (MD) and MD during the production of the nonwoven fabric. Direction (CD) etc. are mentioned. The maximum tensile strength when the nonwoven fabric is wet is preferably 1.5 N / 25 mm or more in at least one of MD and CD, and more preferably 1.5 N / 25 mm or more in both MD and CD.

  In a preferred embodiment (embodiment 4A) of the nonwoven fabric of any one of Embodiments 1A to 3A, the wet thickness is 0.5 mm or more. When the nonwoven fabric of aspect 4A is used as wet wipes (for example, at the time of wiping), a soft feeling of use (for example, wiping comfort) can be realized. Therefore, the nonwoven fabric of aspect 4A is suitable as wet wipes.

  In a preferred embodiment (embodiment 5A) of the nonwoven fabric of any one of Embodiments 1A to 4A, the first and / or second hydrophilic fiber-containing layer is a spunlace-treated layer. The spunlace process is a process of entanglement of fibers by jetting a high-pressure water stream. Since the strength of the first and / or second hydrophilic fiber-containing layer is increased by the spunlace treatment, the first and / or second may occur when used as a wet wipe (for example, when wiping). Breakage of the hydrophilic fiber-containing layer can be prevented. In addition, since the first and / or second hydrophilic fiber-containing layer becomes dense by the spunlace treatment, the thermally expanded hollow particles contained in the third hydrophilic fiber-containing layer are the first and / or It is possible to prevent leakage through the second hydrophilic fiber-containing layer. Therefore, the nonwoven fabric of aspect 5A is suitable as wet wipes.

  In a preferred embodiment (embodiment 6A) of the nonwoven fabric according to any one of Embodiments 1A to 5A, each of the first to third hydrophilic fiber-containing layers contains a heat-fusible fiber, and the first hydrophilic fiber contains The heat-fusible fiber contained in the layer and the heat-fusible fiber contained in the third hydrophilic fiber-containing layer are heat-fused and contained in the second hydrophilic fiber-containing layer. The heat-fusible fiber and the heat-fusible fiber contained in the third hydrophilic fiber-containing layer are heat-fused. Interlaminar adhesion strength can be increased by heat fusion between heat-fusible fibers. For this reason, delamination that may occur when used as wet wipes (for example, during wiping) can be prevented. Therefore, the nonwoven fabric of aspect 6A is suitable as wet wipes.

  In a preferred embodiment (embodiment 7A) of the nonwoven fabric of Embodiment 6A, each layer of the first to third hydrophilic fiber-containing layers contains 1 to 10% by mass of heat-fusible fibers based on the total mass of each layer. This effectively prevents delamination that may occur when used as wet wipes (for example, during wiping) without reducing the water absorption, water retention and high detergency resulting from these. be able to. Therefore, the nonwoven fabric of aspect 7A is suitable as wet wipes.

  In the nonwoven fabric of the present invention, two or more embodiments 1A to 6A can be combined.

  One aspect (aspect 1B) of the wet wipes of the present invention is a wet wipe obtained by impregnating the nonwoven fabric according to any one of aspects 1A to 6A with a liquid.

  In a preferred aspect (aspect 2B) of the wet wipes of aspect 1B, the wet wipes are heated to a predetermined temperature.

Hereinafter, one embodiment of the nonwoven fabric of the present invention is described based on a drawing.
As shown in FIG. 1, the nonwoven fabric 1 has hydrophilic fiber-containing layers 11 and 12 provided in the outermost layer, and a hydrophilic fiber-containing layer 13 provided between the hydrophilic fiber-containing layers 11 and 12. .

  The nonwoven fabric 1 may have one or more intermediate layers between the hydrophilic fiber-containing layers 11 and 13 and / or between the hydrophilic fiber-containing layers 12 and 13. Examples of the intermediate layer include a hydrophilic fiber-containing layer and an adhesive layer. The 1 or 2 or more hydrophilic fiber content layer provided as an intermediate | middle layer can be comprised similarly to 1 or 2 or more of the hydrophilic fiber content layers 11-13.

  In the nonwoven fabric 1 which concerns on this embodiment, as shown in FIG. 1, although the edge part of the hydrophilic fiber containing layers 11 and 12 is isolate | separated, the edge part of the hydrophilic fiber containing layers 11 and 12 is continuing. Also good. For example, in the nonwoven fabric 1 ′ according to another embodiment, as shown in FIG. 14, the hydrophilic fiber-containing layers 11 and 12 are formed by bending one hydrophilic fiber layer, and are hydrophilic. The ends of the fiber-containing layers 11 and 12 are continuous.

  The hydrophilic fiber-containing layers 11 to 13 may contain fibers other than hydrophilic fibers (for example, hydrophobic fibers) as long as they contain hydrophilic fibers. For example, the hydrophilicity of the hydrophilic fiber-containing layer can be controlled by mixing hydrophobic fibers with the hydrophilic fiber-containing layer. The amount of the hydrophilic fiber contained in the hydrophilic fiber-containing layer 11 is usually 20 to 100% by mass, preferably 30 to 100% by mass, more preferably 40 to 100% based on the total mass of the hydrophilic fiber-containing layer 11. % By mass. The amount of the hydrophilic fiber contained in the hydrophilic fiber-containing layer 12 is usually 20 to 100% by mass, preferably 30 to 100% by mass, more preferably 40 to 100% based on the total mass of the hydrophilic fiber-containing layer 12. % By mass. The amount of the hydrophilic fiber contained in the hydrophilic fiber-containing layer 13 is usually 65 to 95% by mass, preferably 80 to 95% by mass, and more preferably 90 to 95% based on the total mass of the hydrophilic fiber-containing layer 13. % By mass.

  Examples of hydrophilic fibers include cellulosic fibers, and examples of cellulosic fibers include wood pulp obtained from coniferous or hardwood as a raw material (for example, groundwood pulp, refiner ground pulp, thermomechanical pulp, chemithermomechanical). Machine pulp such as pulp; chemical pulp such as kraft pulp, sulfide pulp and alkali pulp; semi-chemical pulp etc.); mercerized pulp or crosslinked pulp obtained by chemically treating wood pulp; bagasse, kenaf, bamboo, hemp, Non-wood pulp such as cotton (for example, cotton linter); regenerated cellulose such as rayon and fibril rayon; semi-synthetic cellulose such as acetate and triacetate and the like. Among these, wood pulp, rayon fiber or a mixture thereof is preferable. . The fiber length of the hydrophilic fibers contained in the hydrophilic fiber-containing layers 11 to 13 is usually 15 mm or less, preferably 12 mm or less, more preferably 10 mm or less.

  While the hydrophilic fiber-containing layers 11 and 12 do not contain thermally expanded hollow particles, the hydrophilic fiber-containing layer 13 has 5 thermally expanded hollow particles based on the total mass of the hydrophilic fiber-containing layer 13. It is contained by mass% or more, preferably 10 mass% or more, more preferably 20 mass% or more. In the nonwoven fabric 1, since the hydrophilic fiber-containing layers 11 and 12 provided in the outermost layer do not contain thermally expanded hollow particles, a decrease in the surface strength of the nonwoven fabric 1 due to the presence of thermally expanded hollow particles can be prevented. . For this reason, the nonwoven fabric 1 can have a surface strength that can withstand a frictional force generated when used as wet wipes (for example, when wiping). Moreover, in the nonwoven fabric 1, the thermally expanded hollow particles are not contained in the hydrophilic fiber-containing layers 11 and 12 provided in the outermost layer, and the hydrophilic fibers provided between the hydrophilic fiber-containing layers 11 and 12 Since it is contained in the content layer 13, the thermally expanded hollow particles can be protected from external force. For this reason, the nonwoven fabric 1 can prevent the thermally expanded hollow particles from being destroyed or dropped off due to the frictional force generated when used as wet wipes (for example, during wiping). Therefore, the nonwoven fabric 1 is suitable as wet wipes.

  The thermally expanded hollow particles are obtained by expanding the thermally expandable particles. FIG. 2 is a schematic view for explaining an embodiment of the thermally expandable particle. As shown in FIG. 2A, the thermally expandable particle 60 includes a shell 61 made of a thermoplastic resin and a nucleus 62 in which a low boiling point solvent is enclosed. Examples of the thermoplastic resin constituting the shell 61 of the thermally expandable particle 60 include copolymers such as vinylidene chloride, acrylonitrile, acrylic acid ester, and methacrylic acid ester. Examples of the low boiling point solvent enclosed in the core 62 of the thermally expandable particle 60 include isobutane, pentane, petroleum ether, hexane, low boiling point halogenated hydrocarbon, methylsilane, and the like.

  The average particle diameter of the thermally expandable particles 60 before thermal expansion is usually 5 to 30 μm, preferably 8 to 14 μm. Such a particle size is a particle size when measured in accordance with a screening test method described in JIS R 6002: 1998.

  When the heat-expandable particles 60 are heated, the thermoplastic resin shell 61 is softened and the low boiling point solvent enclosed in the nucleus 62 is vaporized. As a result, as shown in FIG. 2B, the thermally expandable particles 60 expand to become hollow particles 60 '. The volume of the hollow particles 60 ′ after the thermal expansion is usually 20 to 125 times, preferably 50 to 80 times the volume of the thermally expandable particles 60 before the thermal expansion. As the thermally expandable particles 60, commercially available products such as Matsumoto Microsphere (F-36, F-30D, F-30GS, F-20D, F-50D, F-80D) (manufactured by Matsumoto Yushi Seiyaku Co., Ltd.) ), Expandel (WU, DU) (made in Sweden, Nihon Philite Co., Ltd.), etc. can be used.

  The amount of thermally expanded hollow particles contained in the hydrophilic fiber-containing layer 13 is preferably 30% by mass or less, more preferably 25% by mass or less, and still more preferably, based on the total mass of the hydrophilic fiber-containing layer 13. Is 20% by mass or less. As the amount of thermally expanded hollow particles contained in the hydrophilic fiber-containing layer 13 increases, the strength of the nonwoven fabric 1 decreases, but the amount of thermally expanded hollow particles contained in the third hydrophilic fiber-containing layer. However, if it is 30 mass% or less on the basis of the total mass of the hydrophilic fiber content layer 13, the nonwoven fabric 1 can maintain sufficient intensity | strength. For this reason, the nonwoven fabric 1 is hard to tear when it is used as wet wipes (for example, at the time of wiping). Therefore, the nonwoven fabric 1 is suitable as wet wipes. In addition, the upper limit value and lower limit value which were described regarding the quantity of the thermally expanded hollow particle contained in the hydrophilic fiber content layer 13 can be combined suitably. For example, the amount of the thermally expanded hollow particles contained in the hydrophilic fiber-containing layer 13 is preferably 5% by mass to 30% by mass, more preferably 10% by mass, based on the total mass of the hydrophilic fiber-containing layer 13. It can be in the range of -30%, even more preferably 20% to 25% by weight.

  The hydrophilic fiber-containing layer 13 is made of Phyrex RC-104 (manufactured by Meisei Chemical Co., Ltd., a cation-modified acrylic polymer) and Phyrex M (Meisei Chemical Co., Ltd.) in order to improve the fixability of thermally expanded hollow particles. It may also contain a fixing agent such as an industrial copolymer (acrylic copolymer). The hydrophilic fiber-containing layer 13 may further contain an anionic, nonionic, cationic or amphoteric yield improver, a sizing agent, and the like.

  The hydrophilic fiber-containing layers 11 and / or 12 are preferably spunlaced layers. The spunlace process is a process of entanglement of fibers by jetting a high-pressure water stream. Since the strength of the hydrophilic fiber-containing layer 11 and / or 12 is increased by the spunlace treatment, the hydrophilic fiber-containing layer 11 and / or 12 may be generated when used as wet wipes (for example, when wiping). Can be prevented from breaking. Further, since the hydrophilic fiber-containing layer 11 and / or 12 becomes dense by the spunlace treatment, the thermally expanded hollow particles contained in the hydrophilic fiber-containing layer 13 are converted into the hydrophilic fiber-containing layer 11 and / or 12. It is possible to prevent leakage through the passage. Therefore, the nonwoven fabric 1 is suitable as wet wipes.

In the spunlace process, the injection of the high-pressure water stream can be performed once or twice or more. The amount of energy of the high-pressure water stream (the total amount of energy in the case of two or more injections) is usually 0.06264 to 0.39728 kW / m ² , preferably 0.09397 to 0.33939 kW / m ² , more preferably Is 0.11276 to 0.2846 kW / m ² .

  When the hydrophilic fiber-containing layer 11 and / or 12 is a spunlace-treated layer, the hydrophilic fiber-containing layer 11 and / or 12 is such that the surface on which the high-pressure water stream is jetted becomes the surface of the nonwoven fabric 1. It is preferable to be provided in the outermost layer of the nonwoven fabric 1. Since the groove portion is formed on the surface on which the high-pressure water stream is jetted, the dirt can be effectively wiped off by the unevenness on the surface of the nonwoven fabric 1.

  Each of the hydrophilic fiber-containing layers 11 to 13 contains a heat-fusible fiber. The heat-fusible fiber contained in the hydrophilic fiber-containing layer 11 and the heat-fusible fiber contained in the hydrophilic fiber-containing layer 13. The heat-fusible fibers contained in the hydrophilic fiber-containing layer 12 and the heat-fusible fibers contained in the hydrophilic fiber-containing layer 13 are heat-sealed. It is preferable. Interlaminar adhesion strength can be increased by heat fusion between heat-fusible fibers. For this reason, delamination that may occur when used as wet wipes (for example, during wiping) can be prevented. Therefore, the nonwoven fabric 1 is suitable as wet wipes.

  The amount of the heat-fusible fiber contained in each of the hydrophilic fiber-containing layers 11 to 13 is preferably 1 to 10% by mass, more preferably 1 to 8% by mass, even more based on the total mass of each layer. Preferably it is 1-5 mass%. This effectively prevents delamination that may occur when used as wet wipes (for example, during wiping) without deteriorating the water absorption, water retention and high detergency resulting from these. can do. Therefore, the nonwoven fabric 1 is suitable as wet wipes.

  Examples of the heat-fusible fiber include polyolefin fiber, polyester fiber, polyamide fiber, and vinylon fiber. Among these, vinylon fiber is preferable from the viewpoint of hydrophilicity.

  Examples of the polyolefin constituting the polyolefin fiber include, for example, linear low density polyethylene (LLDPE), low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), polypropylene, and polybutylene. Copolymer (for example, ethylene-vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (EEA), ethylene-acrylic acid copolymer (EAA), ethylene-propylene random copolymer (EP) ) And the like. Polyethylene, particularly HDPE, is preferred because it has a relatively low softening point of around 100 ° C. and is excellent in heat workability, and has low rigidity and a supple feel.

  Examples of the polyester constituting the polyester fiber include linear or branched polymers such as polyethylene terephthalate (PET), polytrimethyl terephthalate (PTT), polybutylene terephthalate (PBT), polylactic acid, and polyglycolic acid. And polyesters such as polyhydroxyalkanoic acid having up to 20 carbon atoms, copolymers based on these, and copolymerized polyesters obtained by copolymerizing a small amount of other components with alkylene terephthalate as the main component. Since it has elastic resilience, it is possible to construct fibers and nonwoven fabrics having high cushioning properties, and PET is preferred from the economical point of being obtained industrially at a low cost.

  Examples of the polyamide constituting the polyamide fiber include 6-nylon and 6,6-nylon.

  The heat-fusible fiber may be composed of one type of thermoplastic resin, or a composite fiber containing two or more types of thermoplastic resin (for example, core-sheath type composite fiber, side-by-side type composite fiber) ). The heat-fusible fiber is a short fiber staple fiber. The thickness of the heat-fusible fiber can be adjusted to 1 to 7 dtex, for example. The fiber length of the heat-fusible fiber is usually 15 mm or less, preferably 12 mm or less, more preferably 10 mm or less.

  The heat fusion between the heat-fusible fibers is performed, for example, by heating at a temperature equal to or higher than the melting point of the heat-fusible fibers. The heating temperature can be appropriately adjusted according to the type of heat-fusible fiber. The temperature above the melting point of the heat-fusible fiber may be higher than the temperature at which a part of the heat-fusible fiber melts. For example, when the heat-fusible fiber is a core-sheath type composite fiber, the sheath component is What is necessary is just to be above the melting temperature.

  The heat treatment for heat fusion is not particularly limited as long as it can be heated to a temperature higher than the melting point of the heat-fusible fiber. Examples of the heat treatment include injection of high-pressure steam. A heat medium other than high-pressure steam, for example, hot air, microwaves, ultrasonic waves, infrared rays, or the like can also be used. Note that the heat treatment causes expansion of the thermally expandable particles together with heat fusion.

  The pressure of the high-pressure steam is usually 0.1 to 1.0 MPa, preferably 0.3 to 0.8 MPa, more preferably 0.4 to 0.6 MPa. If the pressure of the high-pressure steam is lower than 0.1 MPa, the high-temperature steam is not sufficiently applied to the thermally expandable particles 60, and the thermally-expandable particles 60 may not be sufficiently heated. On the other hand, if the vapor pressure of the high-pressure steam is higher than 1.0 MPa, the hydrophilic fiber-containing layer may be pierced, torn, or blown away. The gap between the high-pressure steam spray nozzle and the sheet was 2 mm. If it is 2 mm or less, there is a trouble that the sheet is rubbed by the nozzle when the sheet expands and the sheet is torn, and if a gap of 6 mm or more is left, the processing efficiency is remarkably deteriorated and the trouble that sufficient processing cannot be performed occurs.

The bulk density of the nonwoven fabric 1 is less than 0.10 g / cm ^3, preferably 0.098 g / cm ³ or less, more preferably 0.095 g / cm ³ or less. The water absorption rate of the nonwoven fabric is 350 times or more, preferably 360 times or more, and more preferably 365 times or more. When the hydrophilic fiber-containing layer 13 contains 5% by mass or more of thermally expanded hollow particles based on the total mass of the hydrophilic fiber-containing layer 13, the bulk density of the nonwoven fabric 1 of 0.10 g / cm ³ or less and The water absorption magnification of the nonwoven fabric 1 of 350 times or more is realized. For this reason, the nonwoven fabric 1 has a bulky and soft texture, and can also have water absorption, water retention, and high detergency due to these. Therefore, the nonwoven fabric 1 is suitable as wet wipes, especially wet wipes for people such as wiping wipes.

In the nonwoven fabric 1, the hydrophilic fiber-containing layer 13 contains 5% by mass or more of thermally expanded hollow particles based on the total mass of the hydrophilic fiber-containing layer 13, and the bulk density of the nonwoven fabric 1 is 0.10 g / cm. ^{By being 3} or less, sufficient gas (the gas which exists in a hollow particle, and the gas which exists in the space | gap of a nonwoven fabric) is included in the nonwoven fabric 1. For this reason, in the nonwoven fabric 1, the temperature drop after heating is moderate, and the heated state is easily maintained. Therefore, the nonwoven fabric 1 is suitable as a heated wet wipe, particularly as a wet wipe for infants and elderly people who are sensitive to temperature changes.

  The maximum tensile strength when wet of the nonwoven fabric 1 is preferably 1.5 N / 25 mm or more, more preferably 1.6 N / 25 mm or more, and still more preferably 1.7 N / 25 mm or more. When the maximum tensile strength when wet of the nonwoven fabric 1 is 1.5 N / 25 mm or more, it becomes difficult to break when used as wet wipes (for example, when wiping). Therefore, such a nonwoven fabric is suitable as wet wipes. “N / 25 mm” means the maximum tensile strength (N) per 25 mm width in the planar direction of the nonwoven fabric 1, and examples of the planar direction of the nonwoven fabric 1 include a transport direction (MD) and MD in the production of the nonwoven fabric 1. And a direction (CD) orthogonal to each other. The maximum tensile strength when the nonwoven fabric 1 is wet is preferably 1.5 N / 25 mm or more in at least one of MD and CD, and more preferably 1.5 N / 25 mm or more in both MD and CD.

  The maximum tensile strength when the nonwoven fabric 1 is dried is preferably 3.0 N / 25 mm or more, more preferably 4.0 N / 25 mm or more, and still more preferably 5.0 N / 25 mm or more. When the maximum tensile strength is less than 3.0 N / 25 mm, the nonwoven fabric is cut by the tension applied at the time of folding, and processing suitability may deteriorate. “N / 25 mm” means the maximum tensile strength (N) per width of 25 mm in the plane direction of the nonwoven fabric 1, and examples of the plane direction of the nonwoven fabric 1 include a transport direction (MD), MD, and the like during the production of the nonwoven fabric. An orthogonal direction (CD) and the like can be mentioned. The maximum tensile strength during drying of the nonwoven fabric 1 is preferably 3.0 N / 25 mm or more in at least one of MD and CD, and more preferably 3.0 N / 25 mm or more in both MD and CD.

  The wet thickness of the nonwoven fabric 1 is preferably 0.5 mm or more, more preferably 0.54 mm or more, and still more preferably 0.58 mm or more. When the wet thickness of the nonwoven fabric 1 is 0.5 mm or more, a soft feeling of use (for example, wiping comfort) can be realized when used as wet wipes (for example, when wiping). Therefore, such a nonwoven fabric is suitable as wet wipes. The upper limit of the wet thickness of the nonwoven fabric 1 is usually 2.0 mm, preferably 1.8 mm, more preferably 1.6 mm. The ratio of the hydrophilic fiber-containing layer 11 to the wet thickness of the nonwoven fabric 1 is preferably 6 to 24%, more preferably 7 to 22%, and still more preferably 9 to 20%. The ratio of the hydrophilic fiber-containing layer 12 in the wet thickness of the nonwoven fabric 1 is preferably 6 to 24%, more preferably 7 to 22%, and still more preferably 9 to 20%. The ratio of the hydrophilic fiber-containing layer 13 to the wet thickness of the nonwoven fabric 1 is preferably 52 to 88%, more preferably 56 to 86%, and still more preferably 60 to 82%.

  The dry thickness of the nonwoven fabric 1 is preferably 0.58 mm or more, more preferably 0.60 mm or more, and even more preferably 0.65 mm or more. Since the wet thickness tends to be lower than the dry thickness, in order to ensure a wet thickness of 0.50 mm or more, the dry thickness is preferably 0.58 mm or more. The upper limit of the dry thickness of the nonwoven fabric 1 is usually 2.5 mm, preferably 2.3 mm, more preferably 2.0 mm. The ratio of the hydrophilic fiber-containing layer 11 in the dry thickness of the nonwoven fabric 1 is preferably 9 to 25%, more preferably 10 to 24%, and still more preferably 11 to 23%. The ratio of the hydrophilic fiber-containing layer 12 to the dry thickness of the nonwoven fabric 1 is preferably 9 to 25%, more preferably 10 to 24%, and still more preferably 11 to 23%. The proportion of the hydrophilic fiber-containing layer 13 in the dry thickness of the nonwoven fabric 1 is preferably 50 to 82%, more preferably 52 to 80%, and still more preferably 54 to 78%.

The basis weight of the nonwoven fabric 1 is preferably 30 to 100 g / m ² , more preferably 40 to 90 g / m ² , and still more preferably 45 to 80 g / m ² . If the basis weight is less than 30 g / m ^{2, the} amount of water that can be retained becomes too small, and the wiping property is deteriorated. On the other hand, if the basis weight is greater than 100 g / m ² , the thickness and rigidity of the sheet become too high and it is difficult to wipe off. There is a case. The proportion occupied by the hydrophilic fiber-containing layer 11 in the basis weight of the nonwoven fabric 1 is preferably 15 to 30%, more preferably 18 to 27%, and still more preferably 20 to 25%. The proportion of the hydrophilic fiber-containing layer 12 in the basis weight of the nonwoven fabric 1 is preferably 15 to 30%, more preferably 18 to 27%, and still more preferably 20 to 25%. The proportion occupied by the hydrophilic fiber-containing layer 13 in the basis weight of the nonwoven fabric 1 is preferably 40 to 70%, more preferably 46 to 74%, and still more preferably 50 to 60%.

  Wet wipes are obtained by impregnating the nonwoven fabric 1 with a liquid. Such wet wipes can have a surface strength that can withstand frictional forces that occur during use (eg, during wiping). Further, it is possible to prevent the thermally expanded hollow particles from being destroyed or dropped off due to the frictional force generated during use (for example, during wiping). Furthermore, it has a bulky and soft texture, and can also have water absorbency, water retention and high detergency caused by these. Furthermore, the temperature drop after warming is gradual, and the warmed state is easily maintained. Accordingly, wet wipes obtained by impregnating the nonwoven fabric 1 with a liquid are particularly suitable as interpersonal wet wipes such as a wiping wipe, or as wet wipes for infants and elderly people who are sensitive to temperature changes.

  The wet wipes obtained by impregnating the nonwoven fabric 1 with a liquid is preferably heated to a predetermined temperature. The predetermined temperature is usually 30 to 60 ° C, preferably 35 to 55 ° C, and more preferably 40 to 50 ° C.

  Examples of the liquid to be impregnated into the nonwoven fabric 1 include water such as distilled water, and a mixed liquid of water and a preservative such as propylene glycol and paraben. The amount of liquid impregnated into the nonwoven fabric 1 is adjusted so that the moisture content of the nonwoven fabric 1 is usually 200 to 580%, preferably 250 to 450%, more preferably 300 to 360%. Examples of the method for impregnating the nonwoven fabric 1 with a liquid include spray impregnation and immersion impregnation.

  Wet wipes can be used, for example, for wiping off dirt. At this time, the wet wipes can exhibit a high detergency with water absorbed and retained, and can exhibit a soft wiping comfort. Further, the hydrophilic fiber-containing layer 11 and / or 12 is a layer subjected to a spunlace treatment, and the hydrophilic fiber-containing layer 11 and / or 12 has a surface on which the high-pressure water stream is jetted to be the surface of the nonwoven fabric 1. When provided in the outermost layer of the nonwoven fabric 1, since the groove portion formed by high-pressure water jet is present on the surface of the nonwoven fabric 1, dirt can be effectively wiped off by the irregularities on the surface of the nonwoven fabric 1. .

Hereinafter, one embodiment of the manufacturing method of the nonwoven fabric of the present invention is described.
In this embodiment, the nonwoven fabric manufacturing apparatus 100 shown in FIG. 3 is used.
A papermaking raw material A (not shown) is supplied to the raw material supply head 111. The papermaking raw material A supplied to the raw material supply head 111 is supplied from the raw material supply head 111 onto the paper layer forming conveyor belt 112 and deposited on the paper layer forming conveyor belt 112. The paper layer forming conveyor belt 112 is preferably a support having air permeability through which steam can pass. For example, a wire mesh, a blanket, or the like can be used as the paper layer forming conveyor belt 112.

  The papermaking raw material A contains hydrophilic fibers and water. The papermaking raw material A preferably contains heat-fusible fibers. The papermaking raw material A is, for example, a fiber suspension in which fibers are dispersed in water.

  The papermaking raw material A deposited on the paper layer forming conveyor belt 112 is moderately dehydrated by the suction box 113, whereby a paper layer 131 is formed. The paper layer 131 becomes the hydrophilic fiber-containing layer 11 through subsequent processing. The paper layer 131 includes two high-pressure water flow nozzles 114 disposed above the paper layer formation conveyor belt 112 and two high-pressure water flow nozzles 114 disposed between the paper layer formation conveyor belt 112 and the high-pressure water flow nozzle 114. Passes between the suction box 113. The high pressure water flow nozzle 114 ejects a high pressure water flow onto the paper layer 131, and the suction box 113 sucks and collects the water ejected from the high pressure water flow nozzle 114. When a high-pressure water flow is jetted from the high-pressure water flow nozzle 114 onto the paper layer 131, a groove is formed on the surface of the paper layer 131.

  An example of the high-pressure water flow nozzle 114 is shown in FIG. The high-pressure water flow nozzle 114 injects a plurality of high-pressure water flows 141 arranged in the width direction (CD) of the paper layer 131 toward the paper layer 131. By the ejection, a plurality of grooves 142 are formed on the surface of the paper layer 131 so as to be aligned in the width direction (CD) of the paper layer 131 and extend in the machine direction (MD).

  An example of the nozzle hole of the high-pressure water flow nozzle 114 is shown in FIG. The nozzle holes 1141 of the high-pressure water flow nozzle 114 are, for example, arranged in a line in the width direction (CD) of the paper layer. The hole diameter of the nozzle hole 1141 is preferably 90 to 150 μm. When the hole diameter of the nozzle hole 1141 is smaller than 90 μm, the nozzle may be easily clogged, while when the hole diameter of the nozzle hole 1141 is larger than 150 μm, the processing efficiency may be deteriorated.

  The hole pitch of the nozzle holes 1141 (the distance between the centers of the holes adjacent in the width direction (CD)) is preferably 0.5 to 1.0 mm. If the hole pitch of the nozzle holes 1141 is smaller than 0.5 mm, the pressure resistance of the nozzles may be reduced and breakage may occur. On the other hand, if the hole pitch of the nozzle holes 1141 is larger than 1.0 mm, fiber entanglement is insufficient. There is a case.

  When the paper layer 131 receives a high-pressure water flow, the fibers of the paper layer 131 are entangled with each other, and the strength of the paper layer 131 is increased. The principle that the fibers of the paper layer 131 are entangled by the high-pressure water jet will be described with reference to FIG. However, this principle does not limit the present invention.

  As shown in FIG. 6, when the high-pressure water flow 141 is ejected from the high-pressure water flow nozzle 114 toward the paper layer 131, the high-pressure water flow 141 passes through the paper layer 131 and the paper layer forming conveyor belt 112. At this time, the fibers of the paper layer 131 are drawn toward the portion 1121 where the high-pressure water flow 141 passes through the paper layer forming conveyor belt 112. As a result, the fibers of the paper layer 131 gather toward the portion 1121 where the high-pressure water flow 141 passes through the paper layer forming conveyor belt 112, and the fibers are entangled.

  When the fibers of the paper layer 131 are entangled, the strength of the paper layer 131 is increased. As a result, even if high-pressure steam is jetted onto the paper layer in a later step, it is less likely that the paper layer is perforated, the paper layer is torn or blown away. Further, the wet strength of the paper layer 131 can be increased without adding a paper strength enhancer to the papermaking raw material.

  FIG. 7 shows a cross-sectional view in the width direction of the paper layer 131 after the high-pressure water jet treatment. As shown in FIG. 7, a groove 142 is formed on the surface of the paper layer 131 by the high-pressure water flow. A pattern (not shown) corresponding to the pattern of the paper layer forming conveyor belt 112 is formed on the surface opposite to the surface on which the high-pressure water flow is jetted.

  As shown in FIG. 3, the paper layer 131 is transferred to the paper layer transport conveyor belt 115 after the high-pressure water jet process. Then, another paper layer 132 is laminated on the paper layer 131 to form a laminated body 151.

  The paper layer 132 is formed as follows. A papermaking raw material B (not shown) is supplied into a papermaking tank 116 provided with a rotating circular net 117. The papermaking raw material B contains hydrophilic fibers, thermally expandable particles, and water. The papermaking raw material B preferably contains a heat-fusible fiber. The papermaking raw material B is, for example, a suspension in which fibers and thermally expandable particles are dispersed in water. In order to improve the fixing of the thermally expanded particles to the fibers, the papermaking raw material B preferably contains a fixing agent. The papermaking raw material B may further contain an anionic, nonionic, cationic or amphoteric yield improver, a sizing agent, and the like.

  The paper layer 132 is formed by forming the papermaking raw material B into a sheet. For example, the paper layer 132 can be formed on the circular net 117 by sucking the papermaking raw material B supplied into the paper making tank 116 into the rotating circular net 117. The paper layer 132 becomes the hydrophilic fiber-containing layer 13 through subsequent processing. The paper layer 132 will be described with reference to FIG. FIG. 8 is a schematic diagram for explaining the paper layer 132. As shown in FIG. 8, in the paper layer 132, the thermally expandable particles 60 are dispersed in the fibers 70.

  When the paper layer 132 formed on the circular net 117 is transferred to the paper layer transport conveyor belt 115, it is laminated and compressed on the paper layer 131 on the paper layer transport conveyor belt 115, as shown in FIG. A laminate 151 of the paper layer 131 and the paper layer 132 is formed. FIG. 9 is a cross-sectional view of the stacked body 151 in the width direction (CD).

  As shown in FIG. 3, another paper layer 133 is laminated on the surface of the laminated body 151 on the paper layer 132 side to form a laminated body 152. The paper layer 133 is manufactured in the same manner as the paper layer 131. The supplied papermaking raw material C (not shown) supplied to the raw material supply bed 111 contains hydrophilic fibers and water. The papermaking raw material C preferably contains a heat-fusible fiber. The papermaking raw material C is, for example, a fiber suspension in which fibers are dispersed in water. The papermaking raw material C deposited on the paper layer forming conveyor belt 112 is appropriately dehydrated by the suction box 113, whereby a paper layer 133 is formed. The paper layer 133 becomes the hydrophilic fiber-containing layer 12 through subsequent processing. When a high-pressure water flow is jetted from the high-pressure water flow nozzle 114 onto the paper layer 133, grooves are formed on the surface of the paper layer 133, and the fibers of the paper layer 133 are entangled with each other, increasing the strength of the paper layer 133.

  When the paper layer 133 formed on the paper layer transport conveyor belt 112 is transferred to the paper layer transport conveyor belt 115, the paper layer 133 is stacked and compressed on the laminate 151 on the paper layer transport conveyor belt 115, as shown in FIG. As shown, a laminate 152 of paper layer 131, paper layer 132, and paper layer 133 is formed. FIG. 10 is a cross-sectional view of the stacked body 152 in the width direction (CD).

  As shown in FIG. 3, the laminated body 152 is transferred to the paper layer conveyor 118 and then transferred to the drying dryer 119.

  The drying dryer 119 heats the laminated body 152 to dry it. As the drying dryer 119, for example, a Yankee dryer is used. The drying dryer 119 includes a rotating cylindrical dryer, and the surface of the cylindrical dryer is heated to about 110 ° C. by steam or the like. The drying dryer 119 attaches the laminated body 152 to the surface of the rotating cylindrical dryer, and dries the laminated body 152.

  The dry dryer 119 dries the laminated body 152 so that the moisture content of the laminated body 152 is normally 10 to 80%, preferably 20 to 80%, and more preferably 20 to 60%. Here, the moisture content is the amount of water contained in the laminate when the dry mass of the laminate is 100%. When the moisture content of the laminated body 152 is smaller than 10%, the hydrogen bonding force between the fibers of the laminated body 152 becomes strong, and the expansion of the laminated body 152 by high-pressure steam described later is prevented by the strong hydrogen bonding between the fibers. On the other hand, if the moisture content of the laminate 152 is greater than 80%, most of the heat imparted by the high-pressure steam described later is used for the evaporation of moisture, and sufficient heat cannot be imparted to the thermally expandable particles. is there. Moreover, the energy required for drying the laminated body 152 below a predetermined moisture content by high-pressure steam described later may become very high.

  When the laminate 152 is attached to the surface of the cylindrical dryer of the dry dryer 119, the surface of the laminate 152 on which the paper layer 131 or the paper layer 133 is provided is attached to the surface of the cylindrical dryer of the dry dryer 119. It is preferable to make it. That is, it is preferable that the heating surface when the laminated body 152 is heated and dried is the surface on the paper layer 131 side or the surface on the paper layer 133 side. Thereby, the heat of the drying dryer 119 passes through the paper layer 131 or the paper layer 133 portion of the laminate 152 and reaches the paper layer 132 portion where the thermally expandable particles are present. Therefore, the paper layer 132 portion of the laminate 152 does not become excessively hot. Therefore, when the laminate 152 is dried by the drying dryer 119, the paper layer 132 portion is excessively dried or the paper layer 132 portion is dried. It can suppress that the thermally expansible particle | grain in the inside expands. In addition, since the paper layer 131 or the paper layer 133 portion in the laminated body 152 is preferentially dried, the hydrogen bonding between the fibers in the paper layer 131 or the paper layer 133 portion in the laminated body 152 becomes strong, and the paper layer 131 or The strength of the paper layer 133 is increased.

  As shown in FIG. 3, the laminated body 152 moves onto the mesh-shaped outer peripheral surface of the cylindrical suction drum 120 after being dried by the drying dryer 119. At this time, high-pressure steam is sprayed onto the laminate 152 from one steam nozzle 121 disposed above the outer peripheral surface of the suction drum 120. The suction drum 120 has a built-in suction device, and water vapor ejected from the steam nozzle 121 is sucked by the suction device. The heat-expandable particles in the laminate 152 are expanded by the heat of the high-pressure steam sprayed from the steam nozzle 121, and the bulk of the laminate 152 is increased.

  The high-pressure steam sprayed from the steam nozzle 121 may be steam composed of 100% water, or steam containing other gas such as air. However, the high-pressure steam sprayed from the steam nozzle 121 is preferably steam composed of 100% water.

  The temperature of the high-pressure steam is preferably a temperature equal to or higher than the temperature at which the shell 61 of the thermally expandable particle 60 is softened and the thermally expandable particle 60 expands. In addition, since the heat-expandable particles 60 contract when reaching a predetermined temperature or higher, the temperature of the high-pressure steam is preferably a temperature equal to or lower than the temperature at which the heat-expandable particles 60 contract. Therefore, the temperature of the high-pressure steam is appropriately selected depending on the thermally expandable particles 60 used. For example, the temperature of the high-pressure steam is 140 to 190 ° C. Note that the temperature of the high-pressure steam injected from the steam nozzle 121 has a correlation with the vapor pressure of the high-pressure steam described later, so that the temperature of the high-pressure steam can be measured by measuring the vapor pressure of the high-pressure steam.

  An example of the steam nozzle 121 disposed above the suction drum 120 is shown in FIG. The steam nozzle 121 injects a plurality of high-pressure steam 181 arranged in the machine direction (MD) and the width direction (CD) of the stacked body 152 toward the stacked body 152. As a result, the thermally expandable particles in the laminate 152 are expanded, and the bulk of the laminate 152 is increased.

  FIG. 12 is a diagram illustrating an example of the nozzle hole 1211 of the steam nozzle 121. Like the steam nozzle 121 shown in FIG. 12, the nozzle hole rows of the plurality of nozzle holes 1211 arranged in the width direction (CD) are arranged in six rows in the machine direction (MD). In FIG. 11, in order to make the high-pressure steam 181 easy to see, three rows of the high-pressure steam 181 are arranged in the machine direction (MD), but actually six rows are arranged. The number of rows in which the plurality of nozzle holes arranged in the width direction (CD) are arranged in the machine direction (MD) is preferably 4 or more and is not limited to 6. Even if the moving speed in the machine direction (MD) of the laminated body 152 is high by arranging a plurality of nozzle holes arranged in the width direction (CD) in four or more rows in the machine direction (MD) A sufficient amount of heat for the expandable particles to expand can be imparted to the laminate 152 by high-pressure steam. Thereby, the production efficiency of a nonwoven fabric can be improved. By arranging a plurality of high-pressure steam nozzles in the machine direction (MD), a plurality of nozzle holes arranged in the width direction (CD) may be arranged in four or more rows in the machine direction (MD).

  The hole diameter of the nozzle hole of the steam nozzle 121 is preferably 100 to 250 μm. When the hole diameter of the nozzle hole is smaller than 100 μm, energy may be insufficient and the thermally expandable particles may not be heated sufficiently. Moreover, when the hole diameter of the steam nozzle 121 is larger than 250 μm, the energy applied to the stacked body 152 is too large, and the damage to the stacked body 152 may be excessively increased.

  The hole pitch of the nozzle holes (distance between the centers of the nozzle holes adjacent in the width direction (CD)) is preferably 0.5 to 1.0 mm. When the hole pitch of the nozzle holes is smaller than 0.5 mm, the pressure resistance of the steam nozzle 121 is lowered, and there is a possibility that breakage occurs. Moreover, when the hole pitch of the nozzle holes is larger than 1.0 mm, a region where the heating is insufficient may occur in the laminate 152. Thereby, the dispersion | variation in bulk may become large in the laminated body 152. FIG.

  The vapor pressure of the high-pressure steam sprayed from the steam nozzle 114 is preferably 0.4 to 1.5 MPa. When the vapor pressure of the high-pressure steam is lower than 0.4 MPa, the high-temperature steam is not sufficiently applied to the thermally expandable particles 60 in the laminate 152, and the thermally expandable particles 60 may not be sufficiently heated. Further, when the vapor pressure of the high-pressure steam is higher than 1.5 MPa, a hole may be formed in the laminated body 152, the paper layer 133 may be torn or blown off.

  FIG. 13 is a cross-sectional view in the width direction (CD) of the laminated body 152 into which high-pressure water vapor has been jetted. The laminated body 152 includes a vertical direction, a horizontal direction intersecting the vertical direction, a thickness direction perpendicular to the vertical direction and the horizontal direction, one surface perpendicular to the thickness direction, The other surface facing the surface in the thickness direction, extending in the longitudinal direction, having a plurality of grooves 142 arranged in the lateral direction, provided with the paper layer 131 on one surface, and the paper layer 133 Is provided on the other surface, and a paper layer 132 is provided between the paper layer 131 and the paper layer 133. Here, the vertical direction corresponds to the machine direction (MD) (see FIG. 10), and the horizontal direction corresponds to the width direction (CD).

  Since the thermally expandable particles are expanded by the high-pressure steam, the paper layer 132 of the laminate 152 after jetting the high-pressure steam is compared with the portion of the paper layer 132 of the laminate 152 before jetting the high-pressure steam shown in FIG. The part becomes thicker. Thereby, compared with the laminated body 152 before injecting high pressure steam, the volume of the laminated body 152 after injecting high pressure steam can be made 30% or more higher.

  Further, in the laminated body 152, the paper layer 131 and the paper layer 133 are portions where the high-pressure water flow is jetted and the strength is increased. On the other hand, the portion of the paper layer 132 is a portion where the thickness is increased although the fibers are loosened and the strength is weakened due to the expansion of the thermally expandable particles. Thus, by forming the strong portions 131 and 133 and the weakly strong but high-strength portion 132 in the laminate 152, the laminate 152 can balance strength and bulk. That is, this makes it possible to form a laminate 152 that is bulky and has high strength. For this purpose, the thickness of the paper layer 132 is preferably at least twice the thickness of the paper layer 131 and the paper layer 133.

  One or more other layers may be provided between the paper layer 131 and the paper layer 132 and / or between the paper layer 132 and the paper layer 133. Also in this case, the paper layer 131 and the paper layer 133 and the paper layer 132 can form a bulky and high strength paper layer.

  When the volume of the nonwoven fabric increases, the ability to capture dirt on the nonwoven fabric when the object is wiped using the nonwoven fabric increases. Therefore, the wipeability of the nonwoven fabric is improved by the very high volume of the laminate 152. Moreover, since the space for accumulating the water in a nonwoven fabric increases, the water retention of a nonwoven fabric also improves.

  The laminated body 152 is sucked to the suction drum 120 by a suction device built in the suction drum 120. The suction force with which the suction drum 120 sucks the laminated body 152 is preferably −5 to −12 kPa. If the suction force of the suction drum 120 is less than -5 kPa, steam may not be sucked and blowing up may occur. Further, when the suction force of the suction drum 120 is larger than −12 kPa, there are cases where the fibers fall into the suction.

  The distance between the tip of the steam nozzle 121 and the surface of the laminate 152 is preferably 1.0 to 10 mm. If the distance between the tip of the steam nozzle 121 and the surface of the laminated body 152 is smaller than 1.0 mm, a hole may be formed in the laminated body 152, or the laminated body 152 may be broken or blown off. If the distance between the tip of the steam nozzle 121 and the surface of the laminate 152 is greater than 10 mm, the high-pressure steam is dispersed, and the efficiency of applying heat to the thermally expandable particles in the laminate 152 is poor. There is a case.

  The moisture content of the laminated body 152 after jetting high-pressure steam is preferably 40% or less, and more preferably 30% or less. If the moisture content of the laminated body 152 after jetting high-pressure steam is greater than 40%, it may be difficult to reduce the moisture content of the laminated body 152 to 5% or less by drying with a later-described drying dryer. Further, in addition to the drying dryer described later, additional drying is required, and the production efficiency of the nonwoven fabric may be deteriorated.

  Thereafter, as shown in FIG. The drying dryer 122 dries the laminated body 152 sprayed with high-pressure steam until it becomes a nonwoven fabric that is a final product. For the drying dryer 122, for example, a Yankee dryer is used. The drying dryer 122 attaches the laminated body 152 to the surface of the cylindrical dryer heated to about 150 ° C. by steam, and dries the laminated body 152.

  The laminated body 152 after passing through the drying dryer 122 needs to be sufficiently dried. Specifically, the moisture content of the laminated body 152 after passing through the dry dryer 122 is preferably 5% or less. Note that in the case where the moisture content of the stacked body 152 immediately after jetting high-pressure steam is 5% or less, the stacked body 152 sprayed with high-pressure steam may not be further dried using the drying dryer 122 or the like.

  The dried laminate 152 (nonwoven fabric) is wound up by a winder 123.

  By cutting the non-woven fabric produced as described above into a predetermined size, this non-woven fabric can be used as a dry wipe. Moreover, this nonwoven fabric can be used as a wet wipe by cutting the nonwoven fabric manufactured as mentioned above into a predetermined dimension, and impregnating the cut nonwoven fabric with a liquid. As described above, since the capacity of the nonwoven fabric is improved by increasing the bulk of the paper layer, the wipes made from this nonwoven fabric can remove stains well. Since the non-woven paper layer 131 and / or the paper layer 133 has high strength, the surface of the non-woven fabric when the target is wiped by wiping the target with the non-woven paper layer 131 and / or the paper layer 133. Can be prevented from falling off. Moreover, since the nonwoven fabric manufactured as mentioned above becomes bulky and the touch of a nonwoven fabric becomes favorable, it is a nonwoven fabric suitable for the wipe for wiping a human body or an animal body. Furthermore, the nonwoven fabric produced as described above is suitable for wet wipes because it can hold a large amount of water due to its high volume.

  EXAMPLES Hereinafter, although this invention is demonstrated in detail based on an Example, these Examples do not limit this invention.

Conditioned nonwoven fabrics were used to measure various parameters of the nonwoven fabrics produced in the examples and comparative examples. Conditioning of the nonwoven fabric was carried out by storing the nonwoven fabric in a dry state for 24 hours or longer in a standard state (temperature 23 ± 2 ° C., relative humidity 50 ± 5%). As the nonwoven fabric in a dry state, a nonwoven fabric having a moisture content of 7 to 10% was used. Non-woven fabric moisture content (%), bulk density (g / cm ³ ), basis weight (g / m ² ), dry thickness (mm), wet thickness (mm), water absorption ratio (%), dry maximum The tensile strength (N / 25 mm) and the wet maximum tensile strength (N / 25 mm) were measured as described above.

  Hereinafter, the manufacturing method of the nonwoven fabric of an Example and a comparative example is demonstrated.

[Example 1]
Using the nonwoven fabric manufacturing apparatus 100 shown in FIG. 3, the hydrophilic fiber-containing layers 11 and 12 provided in the outermost layer, and the hydrophilic fiber-containing layer 13 provided between the hydrophilic fiber-containing layers 11 and 12 The nonwoven fabric 1 which has this was manufactured.
(1) First Step This step is a step of manufacturing a paper layer 131 corresponding to the hydrophilic fiber-containing layer 11.
The paper material A was prepared by mixing the fiber material A and water at a mass ratio (fiber material: water) of 2:98. As the fiber material A, 59% by weight of softwood bleached kraft pulp (NBKP), 40% by weight of rayon fiber (Corona manufactured by Daiwabo Rayon Co., Ltd., fineness 1.1 dtex, fiber length 8 mm), and vinylon fiber (VPB103 manufactured by Kuraray Co., Ltd.) A fiber material containing 1% by weight (fineness 1.1 dtex, fiber length 3 mm) was used.
The papermaking raw material A is supplied onto the paper layer forming belt 112 using the raw material head 111, and the supplied papermaking raw material is subjected to dehydration processing by the suction box 113 and high-pressure water jet injection processing by the high-pressure water nozzle 114 (twice). ) Were carried out sequentially.
Specific specifications are as follows.
Paper layer forming belt 112: OS80 manufactured by Nippon Filcon Co., Ltd.
Nozzle hole diameter of the high-pressure water flow nozzle 114: 92 μm
Interval between nozzle holes of the high-pressure water flow nozzle 114: 0.5 mm
The distance between the nozzle tip of the high-pressure water flow nozzle 114 and the upper surface of the paper layer: 10 mm
Energy amount of high-pressure water flow in one injection: 0.14230 kW / m ²

The amount of energy of the high-pressure water stream is calculated based on the following formula.
Energy amount (kW / m ² ) = 1.63 × injection pressure (kg / cm ² ) × injection flow rate (m ³ / min) / processing speed (m / min) / 60
The injection flow rate (m ³ / min) is calculated based on the following equation.
Injection flow rate (m ³ / min) = 750 × total orifice opening area (m ² ) × injection pressure (kg / cm ² ) ^0.495

  After performing the high-pressure water jet injection process twice, the formed paper layer 131 was transferred to the paper layer transport conveyor 115.

(2) 2nd process This process is a process of manufacturing the laminated body 151 by manufacturing the paper layer 132 corresponding to the hydrophilic fiber containing layer 13, and laminating this on a paper layer.
The paper material B was prepared by mixing the fiber material B and water at a mass ratio (fiber material: water) of 2:98. As the fiber material B, 73% by weight of softwood bleached kraft pulp (NBKP) and thermally expandable particles (Matsumoto Microsphere F-36, manufactured by Matsumoto Yushi Seiyaku Co., Ltd., particle size 5-15 μm, thermal expansion start temperature 75-85 ° C. ) 20% by weight, first thermally expandable particle fixing agent (Failex RC-104, cation-modified acrylic copolymer manufactured by Meisei Chemical Co., Ltd.) 3.0% by weight, second thermally expandable particle fixing agent (Meisei Chemical Co., Ltd., Phyrex M, acrylic copolymer) 3.0% by weight and vinylon fiber (Kuraray Co., Ltd. VPB103, fineness 1.1 dtex, fiber length 3 mm) 1% by weight It was used.
The prepared papermaking raw material B is supplied into the papermaking tank 116, and the thermally expandable particles are fixed to the fibers. Then, the papermaking raw material B is sucked by the rotating circular mesh 117, and the paper layer 132 is placed on the circular mesh 17. Formed. Then, the paper layer 132 formed on the circular net 117 was laminated | stacked on the paper layer 131 on the paper layer conveyance conveyor 115, and the laminated body 151 was manufactured.

(3) 3rd process This process is a process of manufacturing the laminated body 152 by manufacturing the paper layer 133 corresponding to the hydrophilic fiber containing layer 12, laminating | stacking this on the paper layer 132 side of the laminated body 151. FIG.
The paper material C was prepared by mixing the fiber material C and water at a mass ratio (fiber material: water) of 2:98. As the fiber material C, 59% by weight of softwood bleached kraft pulp (NBKP), 40% by weight of rayon fiber (Corona manufactured by Daiwabo Rayon Co., Ltd., fineness 1.1 dtex, fiber length 8 mm), and vinylon fiber (VPB103 manufactured by Kuraray Co., Ltd.) A fiber material containing 1% by weight (fineness 1.1 dtex, fiber length 3 mm) was used.
The papermaking raw material C is supplied onto the paper layer forming belt 112 using the raw material head 111, and the supplied papermaking raw material is subjected to dehydration processing by the suction box 113 and high pressure water jet injection processing by the high pressure water flow nozzle 114 (twice). ) Were carried out sequentially.
Specific specifications are the same as in the first step.
After the high-pressure water jet treatment was performed twice, the formed paper layer 133 was laminated on the paper layer 132 of the laminated body 151 to produce a laminated body 152.

(4) 4th process After transferring the laminated body 152 to the paper layer conveyance conveyor 118, the laminated body 152 was dried with the Yankee dryer 119 heated at 110 degreeC so that a moisture content might be set to 60%.

(5) Fifth Step High-pressure steam was sprayed from the paper layer 133 side to the laminated body 152 after drying using the steam nozzle 121. Specific specifications are as follows.
Steam pressure of high-pressure steam: 0.7 MPa
High-pressure steam temperature: 175 ° C
Distance between steam nozzle tip and paper surface: 2.0mm
Number of rows of steam nozzles: 6 rows in the machine direction (MD) Nozzle diameter of the steam nozzle: 200 μm
Nozzle hole pitch of steam nozzle: 1.0mm
Suction drum suction: -5.0 kPa
Suction drum circumference: Stainless steel 18 mesh perforated sleeve

(6) 6th process After injection of high pressure steam, the laminated body 152 was dried with the Yankee dryer 122 heated to 150 degreeC so that the moisture content might be 5% or less.
The laminated body 152 manufactured through the first to sixth steps is the nonwoven fabric of Example 1.

[Example 2]
In the fiber material B, a non-woven fabric was formed in the same manner as in Example 1 except that the content of NBKP was changed from 73 wt% to 63 wt% and the content of the thermally expandable particles was changed from 20 wt% to 30 wt%. Manufactured.

[Example 3]
In the fiber material B, a non-woven fabric was formed in the same manner as in Example 1 except that the content of NBKP was changed from 73 wt% to 88 wt% and the content of the thermally expandable particles was changed from 20 wt% to 5 wt%. Manufactured.

[Example 4]
In the fiber material B, a non-woven fabric was formed in the same manner as in Example 1 except that the NBKP content was changed from 73 wt% to 53 wt% and the thermally expandable particle content was changed from 20 wt% to 40 wt%. Manufactured.

[Comparative Example 1]
In the fiber material B, the NBKP content is 73 wt% to 99 wt%, the thermally expandable particle content is 20 wt% to 0 wt%, and the first and second thermally expandable particle fixing agents are contained. A nonwoven fabric was produced in the same manner as in Example 1 except that the amount was changed from 3.0% by weight to 0% by weight.

[Comparative Example 2]
In the fiber material B, a non-woven fabric was formed in the same manner as in Example 1 except that the content of NBKP was changed from 73 wt% to 90 wt% and the content of the thermally expandable particles was changed from 20 wt% to 3 wt%. Manufactured.

  The physical properties of the nonwoven fabrics produced in Examples 1 to 4 and Comparative Examples 1 and 2 are shown in Table 1.

  The nonwoven fabrics produced in Examples 1 to 4 and Comparative Examples 1 and 2 were placed in a warmer (manufacturer: SANYO, model: MOV-212F) and heated to 40 ° C., then removed from the warmer, and the temperature of the nonwoven fabric Over time was measured. The results are shown in Table 2.

In the nonwoven fabrics of Examples 1 to 4 in which the amount of thermally expanded hollow particles contained in the hydrophilic fiber-containing layer 13 is 5% by mass or more based on the total mass of the hydrophilic fiber-containing layer 13, 0.10 g / The nonwoven fabric has a bulk density of less than cm ³ and a nonwoven fabric water absorption of 350 times or more. On the other hand, in the nonwoven fabrics of Comparative Examples 1 and 2 in which the amount of thermally expanded hollow particles contained in the hydrophilic fiber-containing layer 13 is less than 5% by mass based on the total mass of the hydrophilic fiber-containing layer 13, 0. Neither the bulk density of the nonwoven fabric of less than 10 g / cm ³ nor the water absorption capacity of the nonwoven fabric of 350 times or more has been realized. Therefore, compared with the nonwoven fabric of Comparative Examples 1 and 2, the nonwoven fabrics of Examples 1 to 4 have a bulky and soft texture, and also have water absorption, water retention, and high detergency caused by these.

The amount of thermally expanded hollow particles contained in the hydrophilic fiber-containing layer 13 is 5% by mass or more based on the total mass of the hydrophilic fiber-containing layer 13, and the bulk density of the nonwoven fabric is 0.10 g / cm ^3. In the nonwoven fabrics of Examples 1 to 4 which are less than the amount, the amount of the thermally expanded hollow particles contained in the hydrophilic fiber-containing layer 13 is less than 5% by mass based on the total mass of the hydrophilic fiber-containing layer 13. Compared with the nonwoven fabrics of Comparative Examples 1 and 2 in which the bulk density of the nonwoven fabric exceeds 0.10 g / cm ³ , sufficient gas in the nonwoven fabric (gas present in the hollow particles and gas present in the voids of the nonwoven fabric) Is contained, the temperature drop after heating is moderate and the heated state is easily maintained.

  In the nonwoven fabrics of Examples 1 to 4, a wet thickness of 0.5 mm or more is realized. On the other hand, in the nonwoven fabrics of Comparative Examples 1 and 2, a wet thickness of 0.5 mm or more is not realized. Therefore, compared with the nonwoven fabric of Comparative Examples 1 and 2, the nonwoven fabrics of Examples 1 to 4 achieve a soft feeling of use (for example, wiping comfort) when used as wet wipes (for example, during wiping). be able to.

  Therefore, the nonwoven fabrics of Examples 1 to 4 are suitable as wet wipes, particularly as wet wipes for humans such as wiping wipes, or as wet wipes for infants and elderly people who are sensitive to temperature changes.

  The strength of the nonwoven fabric decreases as the amount of thermally expanded hollow particles contained in the hydrophilic fiber-containing layer 13 increases. In order to prevent breakage that may occur during use as wet wipes, considering that the maximum tensile strength when wet of the nonwoven fabric is preferably 1.5 N / 25 mm or more in both MD and CD, The amount of the thermally expanded hollow particles contained in the hydrophilic fiber-containing layer 13 is preferably 30% by mass or less (Examples 1 to 3) based on the total mass of the hydrophilic fiber-containing layer 13. Therefore, when the nonwoven fabric of Examples 1-3 is used as wet wipes (for example, at the time of wiping off), it is suitable for wet wipes.

1 Nonwoven fabric (wet wipes)
11, 12 Hydrophilic fiber-containing layer not containing thermally expanded hollow particles 13 Hydrophilic fiber-containing layer containing thermally expanded hollow particles

Claims (9)

A non-woven fabric having first and second hydrophilic fiber-containing layers provided in the outermost layer and a third hydrophilic fiber-containing layer provided between the first and second hydrophilic fiber-containing layers. And
The first and second hydrophilic fiber-containing layers do not contain thermally expanded hollow particles,
The third hydrophilic fiber-containing layer contains 5% by mass or more of thermally expanded hollow particles based on the total mass of the third hydrophilic fiber-containing layer,
The bulk density of the nonwoven fabric is less than 0.10 g / cm ³ ;
A nonwoven fabric having a water absorption capacity of 350 % or more.   The nonwoven fabric according to claim 1, wherein the amount of thermally expanded hollow particles contained in the third hydrophilic fiber-containing layer is 30% by mass or less based on the total mass of the third hydrophilic fiber-containing layer.   The nonwoven fabric according to claim 2, wherein the maximum tensile strength when wet is 1.5 N / 25 mm or more.   The nonwoven fabric according to any one of claims 1 to 3, wherein the wet thickness is 0.5 mm or more.   The nonwoven fabric according to any one of claims 1 to 4, wherein the first and / or second hydrophilic fiber-containing layer is a spunlace-treated layer.   Each layer of the first to third hydrophilic fiber-containing layers contains a heat-fusible fiber, and the heat-fusible fiber contained in the first hydrophilic fiber-containing layer and the third hydrophilic fiber-containing layer The heat-fusible fiber contained in the heat-fusible fiber is heat-fused, and the heat-fusible fiber contained in the second hydrophilic fiber-containing layer and the heat contained in the third hydrophilic fiber-containing layer The nonwoven fabric according to any one of claims 1 to 5, wherein the fusible fiber is thermally fused.   The nonwoven fabric according to claim 6, wherein each of the first to third hydrophilic fiber-containing layers contains 1 to 10% by mass of heat-fusible fibers based on the total mass of each layer.   A wet wipe obtained by impregnating the nonwoven fabric according to any one of claims 1 to 7 with a liquid.   The wet wipes according to claim 8, wherein the wet wipes are heated to a predetermined temperature.

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