Lotion nonwoven fabric

Abstract

To provide a lotion nonwoven fabric that causes no scratchy feeling when a face or a skin is wiped therewith, and has smooth and moist feeling, excellent liquid absorption property and liquid absorption amount, and good processing characteristics in folding processing.SOLUTION: The invention is a lotion nonwoven fabric which is a nonwoven fabric impregnated with chemical liquid. The nonwoven fabric has a pulp fiber web manufactured by air-laid method. The lotion nonwoven fabric has water absorption velocity less than 10 second / 0.1 mL, water absorption amount (T.W.A) per unit area of 4.0 g / g or more, and average friction coefficient (MIU) by KES method of 0.085 or more and 0.300 or less.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a lotion nonwoven fabric impregnated with a medicinal solution. [Background technology]

[0002] In recent years, growing awareness of hygiene has led to an increase in demand for disposable hand towels. Typical disposable hand towels are made from paper (basically 100% wood pulp, but may also contain recycled paper), and are widely used in corporate offices, hotels, public restrooms, and ordinary homes.

[0003] For example, Patent Document 1 discloses a hand towel made of a composite nonwoven fabric made of wood pulp and synthetic fibers. Composite nonwoven fabrics made of wood pulp and synthetic fibers are thick and have excellent water absorption speed and amount, making them suitable for towel applications. However, compared to nonwoven fabrics made of rayon or the like, they have issues with the prickly feeling and stiffness caused by the pulp fibers, especially when wiping the face.

[0004] To address this issue, the prickly feeling and stiffness inherent to pulp fibers can be improved by applying a lotion solution as disclosed in Patent Document 2. However, the lotion solution contains oil, which inhibits the water absorption rate and results in poor absorbency. Furthermore, rigid nonwoven fabrics tend to be less suitable for processing during folding processes such as interfolders, and lotion-coated nonwoven fabrics can sometimes be poorly processed due to their weakened stiffness. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2023-150476 [Patent Document 2] Patent Publication No. 2021-175554 Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made in view of the above problems, and aims to provide a lotion nonwoven fabric which does not cause a prickly feeling when wiped on the face or skin, gives a smooth and moist feeling, is not reduced in absorbency by oil in a lotion solution, is excellent in absorbency and liquid absorption amount, and has good processing properties when folded. [Means for solving the problem]

[0007] The inventors of the present invention have conducted extensive research in light of the above-mentioned problems. As a result, they have discovered that a lotion nonwoven fabric designed so that the water absorption rate, water absorption per unit area (TWA), and KES (MIU value), an index indicating the average coefficient of friction, fall within predetermined ranges by adjusting the structure of the nonwoven fabric, the chemical solution impregnated into the nonwoven fabric, and the amount of the chemical solution impregnated, can solve the above-mentioned problems, and have completed the present invention. That is, the present invention provides the following.

[0008] (1) A first aspect of the present invention is a lotion nonwoven fabric in which a medicinal solution is impregnated into the nonwoven fabric, the nonwoven fabric having a pulp fiber web produced by an airlaid method, the lotion nonwoven fabric having a water absorption rate of less than 10 seconds / 0.1 mL, a water absorption per unit area (TWA) of 4.0 g / g or more, and a mean coefficient of friction (MIU) measured by the KES method of 0.085 or more and 0.300 or less.

[0009] (2) The second aspect of the present invention is a lotion-based nonwoven fabric according to (1), wherein the softness (TS7) measured by a tissue softness measuring device TSA is 1 dBV or less. 2 rms over 10dBV 2 rms or less, and the smoothness measured by the tissue softness measuring device TSA (TS750) is 10 dBV or less. 2 rms over 45dBV 2 The tissue softness is characterized by a hand feel value (HF) of 81 or more and 100 or less, as measured by a tissue softness measuring device TSA.

[0010] (3) A third aspect of the present invention is the lotion nonwoven fabric according to (1), characterized in that the drug solution is impregnated in an amount of 3% by mass or more and 35% by mass or less relative to 100% by mass of the lotion nonwoven fabric.

[0011] (4) A fourth aspect of the present invention is the lotion nonwoven fabric according to (1), characterized in that the medicinal solution contains an aqueous component and an oily component, and the oily component is silicone oil and / or shea butter.

[0012] (5) A fifth aspect of the present invention is the lotion nonwoven fabric according to (1), wherein the nonwoven fabric is a composite nonwoven fabric in which the pulp fiber web produced by the airlaid method is laminated and integrated onto a spunbond nonwoven fabric, and the basis weight of the lotion nonwoven fabric is 55 g / m 2 More than 80g / m 2 It is characterized by the following: [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a lotion nonwoven fabric which is free from prickly feeling when wiped on the face or skin, has a smooth and moist feeling, is not reduced in absorbency by oil in a lotion solution, is excellent in absorbency and liquid absorption amount, and has good processing properties during folding processing. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, modes for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail, but these are given for illustrative purposes and do not limit the present invention.

[0015] In this specification, "nonwoven fabric" refers to each sheet-like nonwoven fabric cut out from a roll of composite nonwoven fabric. "Lotion nonwoven fabric" refers to a sheet-like nonwoven fabric impregnated with a drug. "Prickly sensation" refers to the pain or sensation of needles pricking when wiping the face, arms, etc. with a lotion nonwoven fabric. Furthermore, the "absorbency" of a lotion nonwoven fabric refers to the speed at which the lotion nonwoven fabric absorbs moisture, and the "liquid absorption amount" of a lotion nonwoven fabric refers to the amount of moisture that the lotion nonwoven fabric can hold. Furthermore, the MD direction and CD direction refer to the direction of the production line (conveying direction) and the direction perpendicular to the production line direction, respectively, during the production of the nonwoven fabric roll.

[0016] [Lotion nonwoven fabric] The lotion nonwoven fabric of the present invention is a nonwoven fabric having a pulp fiber web produced by an airlaid method, which is impregnated with a chemical solution.

[0017] (nonwoven fabric) The nonwoven fabric serving as the substrate of the lotion nonwoven fabric of the present invention has a pulp fiber web produced by the airlaid method. The nonwoven fabric is preferably a composite nonwoven fabric, and more preferably a composite nonwoven fabric in which a pulp fiber web produced by the airlaid method is laminated and integrated onto a spunbond nonwoven fabric. The inclusion of a pulp fiber web produced by the airlaid method gives the nonwoven fabric bulk, good liquid absorption, and a soft texture. Furthermore, compared to wetlaid nonwovens, the nonwoven fabric has a voluminous feel, excellent absorbency and liquid absorption capacity, and is less likely to form a stiff sheet, resulting in good folding suitability. Furthermore, by combining a spunbond nonwoven fabric with the nonwoven fabric, the nonwoven fabric has high strength, is less likely to stretch, and retains its appearance well in both dry and wet states.

[0018] (pulp fiber web) The pulp contained in the pulp fiber web is preferably NBKP such as radiata pine, slash pine, southern pine, spruce, or Douglas fir, and may be appropriately selected taking into consideration defibration properties, yield, and the like.

[0019] (spunbond nonwoven fabric) The spunbond nonwoven fabric is formed by a dry spunbonding method using synthetic resin fibers that can be selected from, for example, nylon, vinylon, polyester, acrylic, polyethylene, polypropylene, polystyrene, polylactic acid, PHBH, and the like.

[0020] The composite nonwoven fabric is not particularly limited in the steps as long as it is a general nonwoven fabric manufacturing method, but preferably includes mainly (1-1) a step of producing a pulp fiber web by an airlaid method, (1-2) a step of placing the pulp fiber web on spunbond nonwoven fabric fibers to form a laminate, (1-3) a step of three-dimensionally entangling the laminate, etc. When the laminate is integrated by hydroentanglement, a conventionally known hydroentanglement technique may be used.

[0021] (grammage of nonwoven fabric) The minimum basis weight of nonwoven fabric in an absolute dry state is 59 g / m 2 More than 61g / m 2 More preferably, 63 g / m 2 More preferably, the upper limit is 150 g / m 2 Less than 140 g / m 2 Less than 130 g / m is more preferable. 2 More preferably, the basis weight is 59 g / m 2 If the basis weight is less than 150 g / m, the thickness of the nonwoven fabric is insufficient and the durability is poor. 2 If the temperature exceeds this value, the lotion nonwoven fabric will become rigid and the sheet will tend to open during folding, resulting in poor processing suitability. The basis weight of the nonwoven fabric can be measured in accordance with JIS P 8124 after conditioning the nonwoven fabric under conditions of 23°C and 50% humidity.

[0022] <Chemical solution> The lotion nonwoven fabric of the present invention is a nonwoven fabric impregnated with a medicinal solution. The medicinal solution contains an aqueous component and an oily component, and may further contain water.

[0023] (aqueous component) Examples of aqueous components include polyhydric alcohols (alcohols having divalent or higher hydroxyl groups). More specifically, examples include glycerin, diglycerin, ethylene glycol, propylene glycol, 1,3-butylene glycol, polyglycerin, polyethylene glycol, polypropylene glycol, sorbitol, xylitol, and erythritol. One type of polyhydric alcohol may be blended, or two or more types may be blended. By including an aqueous component in the drug solution, the moist feeling of the lotion nonwoven fabric is improved.

[0024] The proportion of the active ingredient polyhydric alcohol in the medicinal solution is preferably 72% by mass or more and 92% by mass or less, more preferably 76% by mass or more and 87% by mass or less, and even more preferably 79% by mass or more and 84% by mass or less. By adjusting the content of polyhydric alcohol in the medicinal solution, the moist feeling of the lotion nonwoven fabric can be improved. Note that one type or two or more types of the above polyhydric alcohols may be blended. As the polyhydric alcohol in the medicinal solution, the content of glycerin (excluding water), which provides an excellent texture, is preferably 50% by mass or more, more preferably 65% ​​by mass or more, and even more preferably 80% by mass or more, of the total medicinal solution.

[0025] (Oily ingredients) Examples of oily components include various silicone oils, liquid paraffin, mineral oil, wax, etc. These components may be blended alone or in combination of two or more. By including an oily component in the drug solution, the moist feeling, smoothness, and softness of the feel of the lotion nonwoven fabric can be improved in a balanced manner.

[0026] In the present invention, the content of the oily component in the chemical solution is preferably 0.1% by mass to 3.0% by mass, more preferably 0.5% by mass to 2.5% by mass, and even more preferably 1.0% by mass to 2.0% by mass, which stabilizes the operation during chemical solution application and improves the moist feeling of the lotion-coated nonwoven fabric while effectively preventing a decrease in processability due to an excessive improvement in hand feel.

[0027] Among the oily components, silicone oil and / or shea butter are preferred, silicone oil is more preferred, and amino-modified silicone oil is even more preferred. By using these as the oily components, the moist feeling, smoothness, and softness of the feel of the lotion nonwoven fabric can be effectively improved without deteriorating the properties of the drug solution.

[0028] (Chemical solution impregnation amount) The amount of chemical solution impregnated in the lotion nonwoven fabric of the present invention is preferably 3% by mass or more and 35% by mass or less, more preferably 10% by mass or more and 32% by mass or less, and even more preferably 15% by mass or more and 30% by mass or less, based on 100% by mass of the lotion nonwoven fabric. If the amount of chemical solution impregnated is less than 3% by mass, the fabric will feel prickly during use and will be inferior in smoothness and moistness. If the content exceeds 35% by mass, the fabric will feel sticky and the absorbency of the nonwoven fabric will decrease, resulting in a poor wiping experience, and the nonwoven fabric will become too soft, resulting in poor operability during folding processing.

[0029] The amount of impregnated chemical solution is expressed as a percentage obtained by dividing (B) by (A), where (A) (g) is the mass of the lotion nonwoven fabric of a predetermined mass conditioned under the conditions of JIS P 8111 (1998) and (B) (g) is the mass of the chemical solution contained in the lotion nonwoven fabric of a predetermined mass excluding water, and the amount is expressed as a percentage (%). Note that (B) can be calculated, for example, by extracting the lotion nonwoven fabric with acetone / ethanol. (Chemical solution impregnation amount) = (B) ÷ (A) × 100 (%)

[0030] (Basis weight of lotion nonwoven fabric) The basis weight of the lotion nonwoven fabric is 55g / m 2 More than 80g / m 2 A basis weight of 55 g / m or less is preferred. 2 If the basis weight is less than 80 g / m, the thickness of the nonwoven fabric is insufficient and the durability is poor. 2 If the thickness exceeds 1000 μm, the amount of lotion required will increase, resulting in a decrease in production efficiency. Furthermore, the thickness will increase, resulting in poor processability during folding. The lower limit for lotion-containing nonwoven fabrics is 60 g / m. 2 More preferably, 65 g / m 2 More preferably, the upper limit is 78 g / m 2 Less than 76 g / m is more preferable. 2 The following is more preferable: The basis weight of the lotion nonwoven fabric can be measured in accordance with JIS P 8124 after conditioning the lotion nonwoven fabric under conditions of 23°C and 50% humidity.

[0031] [Physical properties of lotion nonwoven fabric] The lotion nonwoven fabric of the present invention has predetermined physical properties such as absorbency, surface characteristics, texture, etc. The water absorption rate, water absorption per unit area (TWA), average coefficient of friction (MIU), softness (TS7), smoothness (TS750), and hand feel value (HF) of the lotion nonwoven fabric will be explained in detail below in this order.

[0032] <Lotion nonwoven fabric absorbency> (Water absorption rate) The water absorption rate of the lotion nonwoven fabric of the present invention is less than 10 seconds / 0.1 mL. If the water absorption rate is more than 10 seconds / 0.1 mL, the absorbency when used as a towel will be poor, resulting in a poor feel when used and poor processability during folding. The lower limit of the water absorption rate is preferably less than 7 seconds / 0.1 mL, and more preferably less than 3 seconds / 0.1 mL. The water absorption rate is measured based on the water absorption rate test specified in JIS L 1907.

[0033] <Absorption amount of lotion nonwoven fabric> (Water absorption per unit area (TWA)) The water absorption per unit area (TWA) of the lotion nonwoven fabric of the present invention is 4.0 g / g or more. If the water absorption (TWA) is less than 4.0 g / g, a single towel will not be able to maintain a sufficient amount of absorbency when used as a towel, resulting in poor wiping properties. The water absorption (TWA) is preferably 4.2 g / g or more, and more preferably 5.0 g / g or more.

[0034] The water absorption per unit area (TWA: Total Water Absorbency) of the nonwoven fabric was measured by cutting the lotion nonwoven fabric into a square test piece of 76 x 76 mm and measuring the dry mass (W1). After immersing the test piece in distilled water for 2 minutes, one corner of the test piece was placed at the top, and the top and the two adjacent corners were supported and hung in an extended state (RH 100%), and the mass (W2) after leaving it for 30 minutes was measured. The value of (W2 - W1) was then calculated, and this value was used to measure the mass of 1 m of the sample. 2 Water absorption per unit (g / m 2 ), and then the basis weight of the nonwoven fabric (g / m 2 ) to obtain the water absorption per unit weight (TWA) per 1g of nonwoven fabric.

[0035] <Measurement of surface properties of lotion nonwoven fabric> (Mean coefficient of friction (MIU) according to the KES method) The average coefficient of friction (MIU) of the lotion nonwoven fabric of the present invention, as measured by the KES method, is 0.085 or more and 0.300 or less. If the MIU is less than 0.085, the smoothness and moist feeling of the lotion nonwoven fabric will be inferior, and if it exceeds 0.300, the lotion nonwoven fabric will lose its appropriate moist feeling and will have a sticky feel. The lower limit of MIU is more preferably 0.090 or more, and even more preferably 0.110 or more. The upper limit of MIU is more preferably 0.200 or less, and even more preferably 0.130 or less. It is preferable that the average values ​​in the MD and CD directions are within this range, and it is more preferable that all actually measured values ​​in the MD and CD directions are within this range.

[0036] Here, the KES method is an abbreviation for Kawabata Evaluation System, and is one of the methods that can objectively (numerically) evaluate the texture of fabrics. The mean coefficient of friction (MIU) is an item that evaluates the slipperiness of the fabric surface, with a higher value indicating a less slipperiness. Furthermore, in the case of the lotion nonwoven fabric of the present invention, this MIU characteristic increases in value depending on the content of the drug solution, and it has been recognized that it can be used as an indicator of "moist feeling" in addition to surface characteristics.

[0037] The mean coefficient of friction (MIU) can be measured using the KES method with an automated surface testing machine, KES-FB4-AUTO-A, manufactured by Kato Tech Co., Ltd. The mean coefficient of friction (MIU) can be measured by performing measurements three times with a compression speed of 1 mm / sec, a friction probe shape of 10 mm square piano wire, an initial load of 50 gf on the friction probe, and an initial load of 10 gf on the roughness contact probe.

[0038] <Measurement of texture etc. of lotion nonwoven fabric by TSA measurement> In order to evaluate the feel, texture, and texture of the lotion nonwoven fabric of the present invention, a softness measuring device, TSA (Tissue Softness Analyzer), is used to measure softness (TS7), smoothness (TS750), and hand feel value (HF).

[0039] (Softness (TS7)) The lotion-impregnated nonwoven fabric of the present invention was measured to determine whether the maximum peak intensity (TS7) of the spectrum containing 6500 Hz, which was automatically obtained using the software on the tissue softness measuring device TSA, was 1 dBV or less. 2 rms over 10dBV 2 rms or less is preferable, 1.5dBV 2 rms over 9dBV 2 rms or less is preferable, 2dBV 2 rms over 5.5dBV 2 TS7 value is 1 dBV or less. 2If it is less than rms, it will be too soft and will wrinkle a lot during processing. If TS7 is within this range, the softness of the lotion nonwoven fabric will be maintained in a balanced manner.

[0040] (Smoothness (TS750)) The intensity of the maximum peak of the first spectrum from the low frequency side (TS750) automatically obtained by the software on the tissue softness measuring device TSA for the lotion nonwoven fabric of the present invention was 10 dBV. 2 rms over 45dBV 2 rms or less is preferable, 20dBV 2 rms over 40dBV 2 rms or less is preferable, 24dBV 2 rms over 28dBV 2 TS750 value is 10BV or less. 2 If the TS750 is within this range, the smoothness of the lotion nonwoven fabric is maintained in a well-balanced manner.

[0041] (Hand Feel Value (HF)) The hand feel value (HF) of the lotion nonwoven fabric of the present invention, calculated using an algorithm based on measurement data automatically acquired by software on a tissue softness measuring device TSA, is preferably 81 to 100, more preferably 81.5 to 90. The inventors have found that if the HF is within this range, the feel of the lotion nonwoven fabric is maintained in a well-balanced manner, and at the same time, this is also an index of a good range for processability.

[0042] The measurement methods for TS7, TS750, and HF using the tissue softness measuring device TSA and the measuring devices used therein are disclosed in detail, for example, in JP 2013-236904 A (see also Figures 3 to 5). For various measurement methods using the tissue softness measuring device TSA, please refer to the above patent documents. [Example]

[0043] The present invention will be described in detail below with reference to examples, but the present invention is not limited to the examples shown below.

[0044] <Examples 1 to 4, Comparative Examples 1 to 4> A pulp fiber web manufactured by the method shown in Table 1 was placed on a spunbond nonwoven fabric made from polypropylene at a mass ratio of pulp fiber web to spunbond nonwoven fabric of 8:2, and hydroentangled to produce a composite nonwoven fabric. Lotion nonwoven fabrics were then produced under the conditions shown in Table 1, and the following evaluations were carried out.

[0045] (1) Stinging sensation during use Twenty panelists were asked to evaluate the tingling sensation when wiping their wet faces with the lotion-coated nonwoven fabric using a sensory evaluation based on the following three-point scale. ◎: 15 or more people answered "It doesn't sting" ○: The number of people who answered "It doesn't sting" is between 10 and 15. ×: Fewer than 10 people answered "It doesn't sting"

[0046] (2) Smoothness during use Twenty panelists conducted a sensory evaluation of the smoothness of the lotion nonwoven fabric when held with dry hands, using the following three-point scale. ◎: 15 or more people answered "smooth" ○: The number of people who answered "smooth" was 10 or more but less than 15 ×: Fewer than 10 people answered "smooth"

[0047] (3) A pleasant moist feeling when used Twenty panelists were asked to perform a sensory evaluation on the following three-point scale to determine whether the lotion nonwoven fabric left a moderately moist feeling without stickiness when wiping their arms. ◎: 15 or more people answered "It is not sticky and has a moist texture." ○: The number of people who answered "It is not sticky and has a moist texture" is between 10 and 15. ×: Fewer than 10 people answered "It is not sticky and has a moist texture."

[0048] (4) Absorbency of lotion nonwoven fabric Twenty panelists conducted a sensory evaluation of absorbency based on the time required to wipe off the lotion when they wetted their hands with the nonwoven fabric, using the following three-point scale. ◎: 15 or more people answered "It was highly absorbent and could be wiped off quickly." ○: The number of people who answered "It was highly absorbent and could be wiped off immediately" was between 10 and 15. ×: Fewer than 10 people answered "It was highly absorbent and could be wiped off quickly."

[0049] (5) Absorption of lotion nonwoven fabric Twenty panelists were asked to perform a sensory evaluation of the amount of liquid absorbed based on the number of sheets of lotion-laced nonwoven fabric required to wipe off the liquid from their wet faces, using the following three-point scale. ◎: 15 or more people answered "I was able to wipe it off completely with one sheet." ○: The number of people who answered "I was able to wipe it off completely with one sheet" was 10 or more but less than 15. ×: Fewer than 10 people answered "I was able to wipe it off completely with one sheet."

[0050] (6) Processing suitability during folding in the manufacturing process The lotion nonwoven fabric was put into the production line and its suitability for folding (folding processability, appearance of the fold, and degree of wrinkling) was evaluated on the following three levels. ◎: No problems with folding processability, good appearance of folded paper, no wrinkles ○: The folding speed is slightly slower, but the appearance of the fold is good and there are no wrinkles. ×: Poor foldability, sheet fold appearance, or wrinkles

[0051] (comprehensive evaluation) Based on the results of the above evaluations 1 to 6, the evaluation was made on the following four-point scale. 4 points: 4 or more ◎ evaluation results and no × evaluation results 3 points: Three items were rated as ◎ and no items were rated as × 2 points: 2 items with ◎ evaluation results and no × evaluation results 1 point: One or more evaluation results are ×

[0052] Table 1 shows the conditions and evaluation results for each example and comparative example.

[0053] [Table 1]

[0054] As shown in Table 1, it was confirmed that according to this example, a lotion nonwoven fabric can be obtained which has a good tingling sensation, smoothness, and moist feeling during use, excellent absorbency and liquid absorption capacity, and excellent processability during folding processing.

Claims

1. A lotion nonwoven fabric in which a nonwoven fabric is impregnated with a drug solution, The nonwoven fabric has a pulp fiber web produced by an airlaid method, The lotion nonwoven fabric has a water absorption rate of less than 10 seconds / 0.1 mL, a water absorption per unit area (T.W.A.) of 4.0 g / g or more, and an average coefficient of friction (MIU) measured by the KES method of 0.085 or more and 0.300 or less.

2. Softness (TS7) measured by the tissue softness measuring device TSA is 1 dBV ２ rms or more 10dBV ２ is less than or equal to rms, Smoothness measured by the Tissue Softness Measurement Device (TSA) (TS750) is 10 dBV ２ rms or more 45dBV ２ is less than or equal to rms, and 2. The lotion-impregnated nonwoven fabric according to claim 1, wherein the hand feel value (HF) measured by a tissue softness analyzer (TSA) is 81 or more and 100 or less.

3. 2. The lotion-impregnated nonwoven fabric according to claim 1, wherein the drug solution is impregnated in an amount of 3% by mass to 35% by mass based on 100% by mass of the lotion-impregnated nonwoven fabric.

4. The chemical solution contains an aqueous component and an oily component, 2. The lotion-impregnated nonwoven fabric according to claim 1, wherein the oily component is silicone oil and / or shea butter.

5. The nonwoven fabric is a composite nonwoven fabric in which the pulp fiber web produced by the airlaid method is laminated and integrated onto a spunbond nonwoven fabric, The basis weight of the lotion nonwoven fabric is 55 g / m ２ 80g / m or more ２ 2. The lotion nonwoven fabric according to claim 1, wherein the following is true:

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