JP4915926B2 - Moisturizing nonwoven fabric - Google Patents

Description

  The present invention relates to a moisturizing nonwoven fabric provided with moisturizing properties by containing a moisturizing component, and is used in detail for wiping, nursing use, cosmetic use, etc., improving water absorption, water retention, wiping property and texture, The present invention relates to a moisturizing nonwoven fabric that is preferably used for moisturizing skin and wiping dry skin and dry skin in winter.

  As a conventional wet tissue, there is one in which a nonwoven fabric is impregnated with a liquid mainly composed of 200% to 500% water and alcohol (Patent Document 1).

  Furthermore, as a conventional moisturizing tissue, there is a tissue paper impregnated with various moisturizing components (Patent Document 2).

Moreover, as a conventional dry nonwoven fabric, there exists a spunlace nonwoven fabric for wiping that has a good texture by controlling the fiber density with a spunlace nonwoven fabric containing cellulose fibers such as cotton and thermoplastic fibers (Patent Document 3). .
JP 2005-287710 A JP-A-5-156596 Japanese Patent No. 3,578,859

  However, conventional wet tissue has the following problems: 1) it is cold during use, 2) irritate the skin, 3) preservatives are essential, and 4) a packaging container is required to prevent drying. When used on babies and elderly people who are vulnerable to skin irritation, it may cause skin problems.

  Furthermore, in conventional moisturizing tissue, 1) strength is weak, 2) water retention is low, and 3) strength is weakened if the amount of the moisturizing component impregnated is increased in order to increase the moisturizing effect on the skin. And its use has been limited to nostrils.

  Moreover, in the conventional dry nonwoven fabric, some improvement in softness can be seen by devising the manufacturing method, but smoothness, flexibility, moist feeling, etc. are insufficient.

  Therefore, the present invention eliminates the problems of conventional wet tissue and moisturizing tissue, and provides a moisturizing nonwoven fabric excellent in functionality such as texture and wiping properties, water absorption and water retention. is there. Furthermore, this invention is providing the moisture retention nonwoven fabric excellent in functionality, such as a moisture retention liquid transfer property and the skin moisture retention effect.

  The moisturizing nonwoven fabric according to the present invention contains 1% or more of a water-soluble component with respect to the weight of the nonwoven fabric base sheet, and has an equilibrium moisture content of the moisturizing nonwoven fabric and an equilibrium moisture content when the water-soluble component is removed from the moisturizing nonwoven fabric. The rate of increase in equilibrium moisture content when compared is 0.5% or more. A moisturizing nonwoven fabric is a nonwoven fabric containing a moisturizing component. The water-soluble component is a component (excluding fallen fibers) that is washed away when the moisturizing nonwoven fabric is washed with distilled water at 60 ° C. Water-soluble components include moisture-retaining components, moisture retained when the moisture-retaining components are in equilibrium with the atmosphere, and components that have been made water-soluble or water-dispersible by solubilizing or emulsifying lipophilic substances with surfactants, etc. Is included.

  Water-soluble component content is 1-250% with respect to the weight of a nonwoven fabric base paper, Preferably it is 5-150%, More preferably, it is 10-100%. The water-soluble component content can be controlled by the amount of the moisturizing liquid applied to the nonwoven fabric base paper. If the water-soluble component content is less than 1%, the nonwoven fabric is felt hard. If it exceeds 250%, there is a sticky feeling. 10% to 50% is most preferable when the moisturizing nonwoven fabric is desired to be soft and smooth and smooth. When the moisturizing nonwoven fabric is moist and moisturizing effect is required, 50-100% is most preferable.

  The equilibrium moisture content increase rate when comparing the equilibrium moisture content of the moisturizing nonwoven fabric and the equilibrium moisture content when the water-soluble component is removed from the moisturizing nonwoven fabric is preferably 0.5 to 40%, more preferably 1.0 to 20%. 1.0% to 3.0% is most preferable when the moisturizing nonwoven fabric is required to be soft and smooth and smooth. When the moisturizing nonwoven fabric is moist and the moisturizing effect on the skin is required, 3.0 to 10% is most preferable. When the rate of increase in the equilibrium moisture content is 0.5% or less, the properties such as softness and moist feeling of the moisturizing nonwoven fabric are insufficient. When the equilibrium moisture content increase rate is 40% or more, the sticky feeling becomes strong, which is not preferable.

Furthermore, the moisture retention nonwoven fabric according to the present invention has an F5 value per unit basis weight in the strongest direction of 0.40 N · m ² / g or less and a strength in the weakest direction of 1.0 N or more. A moisturizing non-woven fabric that satisfies this condition has a soft feel and is comfortable to use because it conforms to the hand and deforms during use, but has sufficient strength to withstand use.

The F5 value per unit weight in the strongest direction is 0.40 N · m ² / g or less, preferably 0.20 N · m ² / g or less, more preferably 0.15 N · m ² / g or less. When the F5 value per unit basis weight in the strongest direction is 0.40 N · m ² / g or more, the moisturizing nonwoven fabric feels stiff and feels stiff and uncomfortable.
The strength in the weakest direction is 1.0 N or more, preferably 2.0 N or more, more preferably 3.0 N or more. If the strength in the weakest direction is not 1.0 N or more, it will be broken at the time of use and the usability will be poor.

  Furthermore, the moisture retention nonwoven fabric according to the present invention has a water absorption rate of 0.03 to 2.50 ml / g per gram of moisture retention nonwoven fabric after 5 seconds from the start of measurement in the Larose method, and a moisture retention rate of 3.0 or more. It is said. When you wipe the wet skin using a non-woven fabric that satisfies this condition, the moisture contained in the moisturizing non-woven fabric dissolves due to moisture in the skin, and an appropriate amount of the moisturizing component remains with the skin, so the skin feels moist , Moisturizing feel is strong.

  The amount of water absorption per gram of the moisturizing nonwoven fabric after 5 seconds from the start of measurement in the Larose method is 0.03 to 2.50 ml / g. 0.03 to 0.30 ml / g is preferable when emphasizing moisture retention on the skin during use, and 0.30 to 2.50 ml / g is preferable when emphasizing water absorption during use. When the amount of water absorption is 0.03 ml / g or less, there are many unwiped areas when wiping wet skin, and the feeling of use is poor. If the amount of water absorption is 2.50 ml / g or more, the amount of wiping residue is excessively reduced, and the moisturizing component retained by the moisturizing nonwoven fabric becomes difficult to transfer to the skin, leaving a moist and moisturizing feeling on the skin.

  The water retention rate is preferably 3.0 or more, more preferably 4.0 or more. When the moisture retention is 3.0 or less, the moisture becomes saturated as soon as the wet skin is wiped, and the function as a wiping sheet is not achieved.

Furthermore, the moisture-retaining nonwoven fabric according to the present invention has a bending resistance per unit basis weight of 5.0 mN · m ² / g or less in the direction of the largest bending resistance in the handle O meter. Further, it is assumed that the bending resistance per unit weight in the direction in which the bending resistance is the largest in the cantilever method is 1.5 mm · m ² / g or less. A moisturizing non-woven fabric that satisfies this condition is supple, flexible and draped.

The bending resistance per unit weight in the direction of the largest bending resistance in the handle O-meter is 5.0 mN · m ² / g or less, preferably 4.0 mN · m ² / g or less. In the cantilever method, the bending resistance per unit weight in the direction with the largest bending resistance is preferably 1.5 mm · m ² / g or less. Moisturizing non-woven fabrics that do not satisfy these conditions are bent and hard and feel awkward when used.

  The drape coefficient is 68% or less, preferably 65% or less, more preferably 60% or less. It is supple that the drape coefficient is 68% or less, has good along-skin properties, and is easily deformed along the hand when used as a wiper.

The KES bending stiffness B value is 0.20 gf · cm ² / cm or less, preferably 0.15 gf · cm ² / cm or less, more preferably 0.10 gf · cm ² / cm or less in the direction in which the B value is the largest. It is desirable to be. When the KES bending stiffness B value in the largest direction is 0.20 gf · cm ² / cm or less, the moisturizing nonwoven fabric feels soft and flexible. Even when used as a wiper, there is no feeling of tingling.

  The KES shear stiffness G value is 2.00 g / cm · degree or less, preferably 1.50 g / cm · degree or less, more preferably 1.30 g / cm · degree or less, in the direction of the largest G value. The KES shear rigidity G value is a value indicating the stress when a shearing force is applied to the nonwoven fabric, and if the G value is small, it leads to bending softness and good along-skin properties. When the KES shear stiffness G value in the largest direction is 2.00 g / cm · degree or less, the moisturizing nonwoven fabric feels soft, and even when used as a wiper, it does not feel irritating.

  Furthermore, the moisturizing nonwoven fabric according to the present invention has an MIU value of 0.45 or less by a friction tester. Touching a moisturizing nonwoven fabric that satisfies this condition will feel smooth. A moisturizing nonwoven fabric having an MIU value of 0.45 or more does not feel smooth when the surface is touched.

Furthermore, the moisture retention nonwoven fabric according to the present invention has an initial heat flux maximum value Qmax of 0.08 to 0.30 J / cm ² / sec.

The initial heat flux maximum value Qmax is preferably 0.09 to 0.20 J / cm ² / sec. 0.09 to 0.115 J / cm ² / sec is most preferable when the moisturizing nonwoven fabric is desired to be soft and smooth and smooth. When the moisturizing nonwoven fabric is moist and moisturizing effect is required, 0.115 to 0.20 is most preferable. When Qmax is 0.08 J / cm ² / sec or less, no moist feeling is felt. When Qmax is 0.30 J / cm ² / sec or more, it feels cold when touched.

  Conventional nonwoven fabric manufacturing techniques can be employed for the production of the nonwoven fabric before carrying the water-soluble component, that is, the nonwoven fabric base paper.

  Specific examples include a spunlace method, a spunbond method, a wet method, an air laid method, a chemical bond method, and a melt blow method. These production methods can be combined to produce. A spunlace method in which fibers are entangled with water and the fibers are loosely bonded is a preferred manufacturing technique. Among these, a spunlace nonwoven fabric containing cellulosic fibers such as pulp and rayon is more preferable because it has good water absorption and a moist feeling.

The basis weight of the nonwoven fabric base paper can be set to 20 to 100 g / m ² . When pliability, drapeability, etc. are important, such as the use of wiping fine parts such as around the eyes, it is preferably 30 to 60 g / m ² , more preferably 40 to 50 g / m ² . On the other hand, when high water absorption, strength, etc. are important, such as for wiping the entire body, it is 40 to 100 g / m ² , more preferably 50 to 80 g / m ² .

  The water-soluble component can be supported on the nonwoven fabric by applying a moisturizing liquid to the nonwoven fabric base paper. The moisturizing liquid can contain a moisturizing component, water, oils, a surfactant for dispersing the oils in the moisturizing liquid, and the like. If the coating is carried out with the moisture content in the moisturizing liquid adjusted to be close to the equilibrium moisture content of the moisturizing liquid, the drying and humidity conditioning steps after coating can be omitted, which is economical.

  Moisturizing ingredients are substances that have a high moisture retention capacity. Specific examples thereof include glycerin, diglycerin, polyglycerin, ethylene glycol, diethylene glycol, polyethylene glycol, propylene glycol, 1,3-butylene glycol, sorbit, xylitol, and erythritol. , Mannitol, lactitol, oligosaccharide alcohol, maltitol, reduced starch hydrolyzate, fructose, glucose, oligosaccharide, trehalose, glycine betaine, pyrrolidone carboxylic acid, pyrrolidone carboxylate, hyaluronic acid, hyaluronate, lactic acid, lactate And urea.

  Glycerin is suitable in terms of hygroscopicity, cost, and safety. In addition, sorbitol has a lower hygroscopicity than glycerin, but has a high ability to retain the moisture once taken in, and when used in combination with glycerin, the effect of buffering the moisture change of the moisturizing nonwoven fabric accompanying the change in environmental humidity can be obtained.

  Specific examples of oils include hydrocarbons such as liquid paraffin and squalane, olive oil, camellia oil, castor oil, soybean oil, palm oil, beef tallow, tri (caprylic acid / capric acid) glycerin, glycerin tricaprylate, etc. Examples include fats and oils, ester oils such as isopropyl myristate, isopropyl palmitate, and cetyl octanoate.

  The more oils, the better the transferability to the skin.

The water content is a content of water contained in the moisturizing nonwoven is the content of the moisture held by the hygroscopic force of moisturizing or non-woven fabric sheet. That is, it is the content ratio of moisture in equilibrium with moisture contained in the air in the environment where the moisturizing nonwoven fabric is placed. It is essentially different from a product such as wet tissue that contains 200% or more moisture with respect to the weight of the nonwoven fabric and requires a package that prevents drying. However, for the purpose of maintaining hygiene and maintaining a moist feeling, it is possible to perform sealed packaging, and further to package with a high or low moisture content . The moisture content of the packaged moisturizing nonwoven fabric is preferably an equilibrium moisture content at 23 ° C. and 50% RH + 40% or less, more preferably an equilibrium moisture content at 23 ° C. and 50% RH + 20% or less, and 23 ° C. Most preferably, the equilibrium moisture content at 50% RH is 10% or less.

  The method of applying the moisturizing liquid to the non-woven base paper can be selected from ordinary coating methods such as gravure coating, spray coating, die coating and dipping. Although single-sided coating may be used, double-sided coating is preferable in order to make the front and back of the nonwoven fabric even.

  The moisturizing non-woven fabric according to the present invention has excellent usability such as texture and wiping property, and functionality such as water absorption and water retention. Furthermore, the moisturizing nonwoven fabric according to the present invention has excellent functionality such as moisturizing liquid transfer and skin moisturizing action.

Hereinafter, the moisture retention nonwoven fabric concerning this invention is demonstrated in detail based on an Example.
[Example 1]
Softwood kraft pulp (Howsand 400 manufactured by Canford) was disaggregated with a pulper, and a pulp paper having a basis weight of about 30 g / m ² was produced by a circular net type paper machine. Rayon fiber (1.1 dtex 38 mm) was defibrated with two card machines to produce a pair of fiber webs having a basis weight of about 10 g / m ² . The above pulp paper was sandwiched between a pair of fiber webs and supplied to a conveyor belt. The entanglement integration process was performed with a water jet processing device disposed in the travel path of the conveyor belt, to obtain a spunlace nonwoven fabric containing pulp having a basis weight of 52.4 g / m ² . In the water jet treatment, nozzles having a pore diameter of 80 μm and a pitch of 1 mm were used, and treatment was performed at a water pressure of 4.5 MPa.

The nonwoven fabric thus obtained was subjected to moisture retention. A moisturizing liquid was applied to the nonwoven fabric by spray coating. Three types of samples with different amounts of moisturizing liquid applied were prepared. After air-drying and conditioning, the basis weight of the moisturizing nonwoven fabric was measured. 68.4 (referred to as Example 1-1), 74.4 (referred to as Example 1-2), 107.5 g / m ² (Example 1) -3).

  The humectant is 60% by weight of glycerin, 10% by weight of sorbitol, 1% by weight of decaglycerin monostearate, 5% by weight of liquid paraffin, 1% by weight of polyoxyethylene (20EO) sorbitan monostearate, 0.4% of sorbitan monostearate. The formulation was 1% by weight and 22.6% by weight of water.

  The non-woven fabric before the moisturizing process was designated as Comparative Example 1.

  Table 1-1 shows the performance test results and sensory test evaluations of Examples 1-1, 1-2, and 1-3 and Comparative Example 1. The performance test and sensory test of the examples and comparative examples were performed as described below.

[Example 2]
Softwood kraft pulp (Howsand 400 manufactured by Canford) was disaggregated with a pulper, and a pulp paper having a basis weight of about 30 g / m ² was produced by a circular net type paper machine. Fibers containing 50% by weight of rayon fibers (1.1 dtex 38 mm) and 50% by weight of PET fibers (1.1 dtex 38 mm) are defibrated with two card machines, and a pair of fiber webs having a basis weight of about 10 g / m ² is obtained. Produced. The above pulp paper was sandwiched between a pair of fiber webs and supplied to a conveyor belt. Entanglement integration processing was performed with a water jet processing device arranged in the travel path of the conveyor belt to obtain a spunlace nonwoven fabric containing pulp having a basis weight of 50.2 g / m ² . In the water jet treatment, nozzles having a pore diameter of 80 μm and a pitch of 1 mm were used, and treatment was performed at a water pressure of 4.5 MPa.

The nonwoven fabric thus obtained was subjected to moisture retention. A moisturizing liquid was applied to the nonwoven fabric by spray coating. Three types of samples with different amounts of moisturizing liquid applied were prepared. After air-drying and conditioning, when the basis weight of the moisturizing nonwoven fabric was measured, 58.2 (referred to as Example 2-1), 71.6 (referred to as Example 2-2), and 103.7 g / m ² (Example 2). -3). The same moisturizing liquid as in Example 1 was used as the moisturizing liquid.

  The non-woven fabric before the moisturizing process was designated as Comparative Example 2.

  Table 2 shows the performance test results and sensory test results of Examples 2-1, 2-2, and 2-3 and Comparative Example 2. The performance test and sensory test of the examples and comparative examples were performed as described below.

Example 3
Softwood kraft pulp (Howsand 400 manufactured by Canford) was disaggregated with a pulper, and a pulp paper having a basis weight of about 25 g / m ² was produced by a circular net type paper machine. Rayon fiber (1.7 dtex 40 mm) was defibrated with two card machines to produce a pair of fiber webs having a basis weight of about 13 g / m ² . The above pulp paper was sandwiched between a pair of fiber webs and supplied to a conveyor belt. The entanglement integrated process was performed with the water jet processing apparatus arrange | positioned in the driving | running | working path | route of the conveyance belt, and the spunlace nonwoven fabric with a pulp of 51.7 g / m < ² > was obtained. The water jet treatment was performed at a water pressure of 5.0 MPa using a nozzle having a pore diameter of 100 μm and a pitch of 1 mm.

The nonwoven fabric thus obtained was subjected to moisture retention. A moisturizing liquid was applied to the nonwoven fabric by a gravure coating method. It was 70.1 g / m < ² > when the fabric weight of the moisture retention nonwoven fabric was measured after air drying and humidity control. The same moisturizing liquid as in Example 1 was used as the moisturizing liquid.

  The non-woven fabric before the moisturizing process was designated as Comparative Example 3.

  The results of the performance test of Example 3 and Comparative Example 3 and the evaluation of the sensory test are shown in Table 3. The performance test and sensory test of the examples and comparative examples were performed as described below.

Example 4
Softwood kraft pulp (Howsand 400 manufactured by Canford) was disaggregated with a pulper, and a pulp paper having a basis weight of about 32 g / m ² was produced by a circular net type paper machine. A fiber blended with 50% by weight of rayon fiber (1.7 dtex 40 mm) and 50% by weight of PET fiber (1.6 dtex 44 mm) was defibrated with one card machine to prepare a fiber web having a basis weight of about 14 g / m ² . The above pulp paper was stacked on the fiber web and fed to the conveyor belt. The entanglement integrated process was performed with the water jet processing apparatus arrange | positioned in the driving | running | working path | route of the conveyance belt, and the spunlace nonwoven fabric with a pulp of 45.5 g / m < ² > of fabric weight was obtained. The water jet treatment was performed at a water pressure of 3.5 MPa using a nozzle having a pore diameter of 100 μm and a pitch of 1 mm.

The nonwoven fabric thus obtained was subjected to moisture retention. A moisturizing liquid was applied to the nonwoven fabric by a gravure coating method. It was 57.0 g / m < ² > when the fabric weight of the moisture retention nonwoven fabric was measured after air drying and humidity control. The same moisturizing liquid as in Example 1 was used as the moisturizing liquid.

  The non-woven fabric before the moisturizing process was designated as Comparative Example 4.

  The results of the performance test of Example 4 and Comparative Example 4 and the evaluation of the sensory test are shown in Table 3. The performance test and sensory test of the examples and comparative examples were performed as described below.

Example 5
Rayon fiber (1.7 dtex 40 mm) was defibrated with two card machines and supplied to the conveyor belt. Entanglement integration processing was performed with a water jet processing device disposed in the travel path of the conveyor belt, and a spunlace nonwoven fabric having a basis weight of 46.0 g / m ² was obtained. The water jet treatment was performed at a water pressure of 5.0 MPa using a nozzle having a pore diameter of 100 μm and a pitch of 1 mm.

The nonwoven fabric thus obtained was subjected to moisture retention. A moisturizing liquid was applied to the nonwoven fabric by a gravure coating method. It was 64.4 g / m < ² > when the fabric weight of the moisture retention nonwoven fabric was measured after air drying and humidity control. The same moisturizing liquid as in Example 1 was used as the moisturizing liquid.

  The non-woven fabric before the moisturizing process was designated as Comparative Example 5.

  The results of the performance test of Example 5 and Comparative Example 5 and the evaluation of the sensory test are shown in Table 4. The performance test and sensory test of the examples and comparative examples were performed as described below.

Example 6
Pulp paper was produced by a short net paper machine using raw materials blended with 50% by weight of softwood kraft pulp (Cansand Corp. Howsand 400) and 50% by weight of rayon fiber (1.7 dtex 10 mm). This pulp paper was supplied to a conveyor belt, and entangled and integrated with a water jet processing device disposed in the traveling path of the conveyor belt, to obtain a spunlace nonwoven fabric containing pulp having a basis weight of 43.2 g / m ² . The water jet treatment was performed using a nozzle having a pore diameter of 100 μm and a pitch of 1 mm, and a water pressure of 4 MPa.

The nonwoven fabric thus obtained was subjected to moisture retention. A moisturizing liquid was applied to the nonwoven fabric by a gravure coating method. It was 56.4 g / m < ² > when the fabric weight of the moisture retention nonwoven fabric was measured after air drying and humidity control. The same moisturizing liquid as in Example 1 was used as the moisturizing liquid.

  The non-woven fabric before the moisturizing process was designated as Comparative Example 6.

  The performance test results of Example 6 and Comparative Example 6 and the sensory test evaluation are shown in Table 4. The performance test and sensory test of the examples and comparative examples were performed as described below.

Example 7
Pulp paper was produced by a short net paper machine using raw materials blended with 50% by weight of softwood kraft pulp (Cansand Corp. Howsand 400) and 50% by weight of rayon fiber (1.7 dtex 10 mm). This pulp paper was supplied to the conveyor belt, and entangled and integrated with a water jet processing device disposed in the traveling path of the conveyor belt, to obtain a spunlace nonwoven fabric with a pulp weight of 51.1 g / m ² . The water jet treatment was performed using a nozzle having a pore diameter of 100 μm and a pitch of 1 mm, and a water pressure of 4 MPa.

The nonwoven fabric thus obtained was subjected to moisture retention. A moisturizing liquid was applied to the nonwoven fabric by a gravure coating method. It was 74.3 g / m < ² > when the fabric weight of the moisture retention nonwoven fabric was measured after air drying and humidity control. The same moisturizing liquid as in Example 1 was used as the moisturizing liquid.

  The non-woven fabric before the moisturizing process was designated as Comparative Example 7.

  The results of the performance test of Example 7 and Comparative Example 7 and the evaluation of the sensory test are shown in Table 5. The performance test and sensory test of the examples and comparative examples were performed as described below.

[ Reference Example 8]
A moisturizing liquid was applied to a commercially available lead cooking paper (basis weight 38.1 g / m ² ) by a gravure coating method. It was 55.6 g / m < ² > when the fabric weight of the moisture retention nonwoven fabric was measured after air drying and humidity control. The same moisturizing liquid as in Example 1 was used as the moisturizing liquid.

  The non-woven fabric before the moisturizing process was designated as Comparative Example 8.

The results of the performance test of Reference Example 8 and Comparative Example 8 and the evaluation of the sensory test are shown in Table 5. The performance test and sensory test of the examples, comparative examples , and reference examples were conducted as described below.

<Performance test>
Samples were conditioned in a 23 ° C., 50% RH environment according to JIS P8111 (paper, paperboard and pulp—standard conditions for humidity conditioning and testing).

(Weight)
JIS L1913 (General Short Fiber Nonwoven Fabric Test Method) Mass per unit area was taken as the basis weight.

(Water-soluble component content)
The measurement was performed according to the following procedure.
Humidity of five samples cut to a size of 100 mm × 100 mm is measured in a standard state (23 ° C., 50%) and the weight is measured (the weight is A. That is, A = (weight of non-woven fiber) + (Equilibrated moisture weight of non-woven fiber) + (Moisturizing component weight) + (Equilibrated moisture weight of moisturizing component)). The sample was washed for 10 minutes with stirring in 2 L of distilled water at 60 ° C., and the sample water was sufficiently drained (if there was a drop fiber, filtered using filter paper, and the resulting drop fiber was the same as the nonwoven fabric sample. To the weight B of the nonwoven fabric sample). It is dried for 3 hours using a hot air drier at 105 ° C., and is conditioned again in the standard state (23 ° C., 50%), and the weight is measured (the weight is B. That is, B = (weight of non-woven fiber) ) + (Equilibrium moisture weight of non-woven fiber)). At this time, the water-soluble component content is calculated by the following formula.
Water-soluble component content (%) = (A−B) ÷ B × 100

(Equilibrium moisture content)
Measured by the following procedure with reference to JIS P8127 (paper and paperboard-moisture test method-method using a dryer).

Five samples cut to a size of 100 mm × 100 mm are conditioned in a standard state (23 ° C., 50%) and the weight is measured (the weight is A). The sample is put into a weighing bottle (a cylindrical bottle having a barrel diameter of 60 mm and a height of 80 mm is used), the lid is closed, and the weight is measured (the weight is defined as B). Open the lid of the weighing bottle, put it in a hot air dryer at 105 ° C for 3 hours to dry, close the lid of the weighing bottle, cool to 23 ° C in a desiccator, and measure the weight (the weight is C and To do). At this time, the equilibrium moisture content is calculated by the following equation.
Equilibrium moisture content (%) = (BC) ÷ A × 100
Moreover, the moisture content of the moisture-retaining nonwoven fabric sealed and packaged is calculated from the weight immediately after the moisture-retaining nonwoven fabric is taken out from the package and the moisture content contained in the moisture-retaining nonwoven fabric immediately after removal.

(Equilibrium moisture content increase rate)
Using the above method, measure the equilibrium moisture content of the moisturized nonwoven fabric and the equilibrium moisture content of the nonwoven fabric (nonwoven fabric before moisturizing) when water-soluble components are removed from the moisturized nonwoven fabric. did.
Equilibrium moisture content increase rate (%) = (Equilibrium moisture content of moisturizing nonwoven fabric)-(Equilibrium moisture content when water-soluble components are removed from moisturizing nonwoven fabric)

(Strong elongation measurement)
It measured according to JIS L1913 (general short fiber nonwoven fabric test method). However, the test was performed at a sample width of 50 mm, a gripping interval of 100 mm, and a tensile speed of 300 mm / min. For the F5 value, the stress when the sample was stretched by 5% was measured.

(Water absorption)
The water absorption at the time of 5 seconds, 10 seconds, and saturation was measured from the start of the test by the Larose method. The water absorption per gram of sample was calculated by dividing the water absorption by the sample weight.

(Water retention rate)
The water retention rate was measured by the following method.
The sample is cut into a size of 100 mm × 100 mm, and the weight after conditioning in a standard state (23 ° C., 50%) is measured (the weight is A). The sample is immersed in distilled water in a vat for 60 seconds, then left on a wire mesh with an inclination angle of 30 ° for 60 seconds, and is quickly placed on a scale and its weight is measured (B is the weight). At this time, the water retention rate is calculated by the following equation.
Water retention rate = (B-A) / A

(Flexibility)
JIS L1096 (General Textile Test Method) Bending / softening property Measured according to each of A method (45 ° cantilever method), E method (handle O meter method), and G method (drape coefficient). However, in the E method, the sample size was set to 100 mm × 100 mm, and the measurement was performed at the center position of the sample. The slit width was 10 mm.

(KES surface test)
It was measured by Kato Tech Co., Ltd. KES SE friction tester. A friction element (a silicone sensor for KES SE manufactured by Kato Tech Co., Ltd.) having a silicone rubber on the surface of the friction element was used. The measurement was performed with a contact area of the friction element of 1 cm ² , a load of 25 gf / cm ² , and a sample stage moving speed of 1 mm / sec. The back and front surfaces of each sample were measured in the vertical direction and the horizontal direction, and all data were averaged.

(KES pure bending test)
The bending stiffness B and the bending hysteresis width 2HB were measured with a Kato Tech Co., Ltd. KES FB2 pure bending tester. The sample width was 200 mm and the measurement was performed under standard high sensitivity conditions. When the sample size is smaller than 200 mm, measurement may be performed with a sample width of 100 mm.

(KES shear test)
The shear stiffness G and the hysteresis width 2HG at a shear of 0.5 ° were measured by a Kato Tech Co., Ltd. KES FB1 shear tester. The sample width was 200 mm and the measurement was performed under standard high sensitivity conditions.

(Initial heat flux maximum value Qmax)
Qmax was measured by Kato Tech Co., Ltd. KES F7 THERMO LABO. The sample temperature was 20 ° C., the initial copper plate temperature was 30 ° C., and the contact pressure was 10 gf / cm ² . Measurement was performed on the front and back surfaces, and the data was averaged.

<Sensory test>
Ten panelists touched each sample by hand and evaluated the following items.
(soft)
Very soft: 4 points, soft: 3 points, slightly soft: 2 points, not soft: 1 point The following notation was made for the total score obtained by summarizing the evaluation points of 10 panelists.
36 to 40 points: ◎, 26 to 35 points: ○, 16 to 25 points: Δ, 10 to 15 points: ×

  The total score was similarly obtained for the following evaluation items, and the same notation was used.

(Smoothness)
Very smooth: 4 points, smooth: 3 points, slightly smooth: 2 points, not smooth: 1 point

(Moist feeling)
Very moist: 4 points, moist: 3 points, slightly moist: 2 points, not moist: 1 point

(Moisturizing skin)
When the hands were washed with water and then wiped with each sample, the moisture felt on the skin was evaluated.
Strongly moisturizes skin: 4 points, feels moisturized skin: 3 points, feels slightly moisturized skin: 2 points, does not feel moisturized skin: 1 point

(Dirt wiping property)
The experiment was conducted assuming that the dirt around the eyes was wiped so as not to irritate the eyes. I drew a circle with a diameter of 1cm in the center of the palm with a magic and ketchup on the entire palm. Taking care not to touch the ketchup in the circle, the ease of wiping when the ketchup outside the circle was wiped with the sample was evaluated.

  Very good wipeability: 4 points, good wipeability: 3 points, slightly good wipeability: 2 points, poor wipeability: 1 point

〔Test results〕
In any of the non-woven fabrics, compared to the comparative example that is not moisturized, the examples that are moisturized are greatly improved in any of softness, smoothness, moist feeling, and skin moisturizing properties. Although the non-woven fabric of the comparative example can remove dirt in terms of wiping off dirt on the skin, it is inferior in smoothness and softness, so it is difficult to do fine work. In addition, physical irritation to the skin is large.

  In Example 1 and Example 2, samples with different amounts of moisturizing liquid applied were prepared. In Example 1-1 and Example 2-1, which have a small amount of moisturizing liquid applied, it is sufficiently soft. Rather than being moist, it felt smooth. As the amount of moisturizing liquid increases, the moist feeling increases. In Example 1-3 and Example 2-3, the feeling that the skin is moisturized can be clearly seen.

  Even in a nonwoven fabric subjected to strong hydroentanglement treatment as in Example 3, a moisturizing nonwoven fabric excellent in tactile sensation is obtained.

  When a moisture retention process is performed on a nonwoven fabric having a large amount of pulp as in Example 4, a soft nonwoven fabric having a particularly moist feeling can be obtained. In addition, it exhibits excellent water absorption.

  When a moisture retaining process is performed on a non-woven fabric not blended with pulp as in Example 5, the non-woven fabric softer than the original is softened, and a moist feeling can be imparted.

  When wet processing such as Examples 6 and 7 is also performed, a moisturizing nonwoven fabric with excellent tactile sensation is obtained.

Even in a non-woven fabric produced by the air raid method as in Reference Example 8, when moisture retention is performed, softness, moist feeling, and moisture retention of the skin are improved.

Claims (7)

The spunlace nonwoven sheet, moisturizing processed by moisturizing solution containing a water-soluble component and water, a spunlaced moisturizing nonwoven fabric containing 5 to 150 percent water-soluble components relative to the weight of the spun lace nonwoven fabric sheet, a sealed package the water content of the spunlace moisturizing nonwoven fabric, an equilibrium moisture content + 20% and below, compared with the equilibrium moisture content at the time of removal of water-soluble components from the spunlaced moisturizing nonwoven equilibrium moisture content and the spun lace moisturizing nonwoven The sealed packaged span is characterized in that the rate of increase in the equilibrium moisture content is 0.5 to 40%, and the maximum initial heat flow rate Qmax is 0.08 to 0.30 J / cm ² / sec. Lace moisturizing nonwoven fabric. The moisturizing nonwoven fabric according to claim 1, wherein the spunlace nonwoven fabric base paper has a basis weight of ²⁰ to 100 g / m2. The moisturizing nonwoven fabric according to claim 1 or ² , wherein the F5 value per unit basis weight in the strongest direction is 0.40 N · m ² / g or less, and the strength in the weakest direction is 1.0 N or more. . The water absorption per gram of the moisturizing nonwoven fabric after 5 seconds from the start of measurement in the Larose method is 0.03 to 2.50 ml / g, and the water retention is 3.0 or more. The moisturizing nonwoven fabric according to any one of the above. The moisturizing nonwoven fabric according to any one of claims 1 to 4, wherein the bending resistance per unit basis weight in the direction of the largest bending resistance in the handle O-meter is 5.0 mN · m ² / g or less. The moisturizing nonwoven fabric according to any one of claims 1 to 5, wherein the bending resistance per unit basis weight in the direction where the bending resistance is the largest in the cantilever method is 1.5 mm · m ² / g or less. The moisturizing nonwoven fabric according to any one of claims 1 to 6, wherein the MIU value by a friction tester is 0.45 or less.