Paper towel containing sodium hyaluronate and method for producing same

Abstract

The present invention discloses a paper towel containing sodium hyaluronate and a method for producing the same. The average fiber length of the paper towel is 0.7 to 1.4 mm, the water content in the paper towel is 8 to 20% by weight, and the water activity A of the paper towel is calculated according to the following formula: A<-13.78×M 2 +4.89×M+0.3, where M is the water content in the paper towel. The paper towel contains sodium hyaluronate and a water activity regulator, and the friction force of the high water content paper towel coated with sodium hyaluronate can be significantly reduced by adjusting the relationship between the water activity and water in the paper towel.

Description

[Technical Field]

[0001] The present invention relates to the technical field of paper product manufacturing, and more particularly to paper towels containing sodium hyaluronate and methods for making same. [Background technology]

[0002] Sodium hyaluronate is a natural skin moisturizer, and coating paper towels with it improves their moisturizing effect on the skin. However, due to the strong water absorption properties of sodium hyaluronate, the moisture content of coated paper towels is significantly higher than that of regular paper towels. For example, the moisture content of sodium hyaluronate-coated paper towels is typically 8-20%, while the moisture content of regular paper towels is typically 5-7%.

[0003] As the moisture content of paper towels increases, the cohesive strength between fibers decreases, causing the fibers at the interface to become disordered when the paper towel rubs against the skin, increasing friction and causing the stratum corneum to peel off, significantly reducing the moisturizing effect of the paper towel as a whole. Summary of the Invention

[0004] In view of the above problems, the present invention provides a paper towel containing sodium hyaluronate, which contains sodium hyaluronate and a water activity regulator, and can reduce the frictional force of the paper towel.

[0005] The present invention is based on the introduction of one or more components into paper towels, which can form stronger hydrogen bonds with water, thereby reducing the interaction between water and fibers, and these components are called water activity regulators.By adjusting the relationship between the water activity coefficient and moisture of paper towels, the friction force of high-moisture paper towels coated with sodium hyaluronate can be significantly reduced.

[0006] The specific technical solutions of the present invention are as follows:

[0007] 1. A paper towel containing sodium hyaluronate, wherein the average fiber length of the paper towel is 0.7 to 1.4 mm, the water content of the paper towel is 8 to 20% by weight, and the water activity A of the paper towel satisfies the following formula: A<-13.78×M 2 +4.89×M+0.3, where M is the moisture content in the paper towel. 2. The paper towel according to Item 1, wherein the paper towel contains sodium hyaluronate and a water activity regulator, preferably 40 to 1600 parts by weight of the water activity regulator per 1 part by weight of sodium hyaluronate. 3. The paper towel according to Item 2, wherein the molecular weight of the sodium hyaluronate is 10w to 250w Da. 4. The paper towel according to item 2 or 3, wherein the water activity regulator is a substance containing a hydroxyl group, a carboxyl group, or an aldehyde group, and is preferably glycerin, sucrose, glucose, fructose, polyethylene glycol, butylene glycol, pentylene glycol, mannitol, sorbitol, polysorbate, or a combination thereof. 5. The paper towel according to any one of items 1 to 4, wherein the content of the sodium hyaluronate on the paper towel is 40 to 5700 ppm. 6. The paper towel according to any one of items 1 to 5, wherein the cellulose content of the paper towel is 50% or more of the total mass of the paper towel. 7. The paper towel further contains an essential oil or essence; Preferably, the paper towel further comprises a skin care ingredient; Item 7. The paper towel according to any one of items 1 to 6, wherein the paper towel preferably has a basis weight of 10 to 200 gsm. 8. A paper towel finishing liquid containing hyaluronic acid and a water activity regulator, preferably containing 40 to 1600 parts by weight of the water activity regulator per 1 part by weight of sodium hyaluronate; Preferably, the molecular weight of the sodium hyaluronate is 10w to 250w Da, Preferably, the water activity regulator is a substance containing a hydroxyl group, a carboxyl group, or an aldehyde group, and is preferably glycerin, sucrose, glucose, fructose, polyethylene glycol, butylene glycol, pentylene glycol, mannitol, sorbitol, polysorbate, or a combination thereof. 9. A method for producing paper towels by spray coating a paper towel substrate with a solution containing hyaluronic acid and a water activity regulator. 10. The molecular weight of the sodium hyaluronate is 10w to 250w Da; Preferably, the content of the sodium hyaluronate on the paper towel is 40 to 5700 ppm, Preferably, the water activity regulator is a substance containing a hydroxyl group, a carboxyl group or an aldehyde group, preferably glycerin, sucrose, glucose, fructose, polyethylene glycol, butylene glycol, pentylene glycol, mannitol, sorbitol, polysorbate, or a combination thereof; Item 10. The method according to Item 9, wherein the amount of the water activity regulator is preferably 40 to 1600 parts by weight per part by weight of sodium hyaluronate. [Effects of the Invention]

[0008] The paper towel of the present invention contains sodium hyaluronate and a water activity regulator, and by adjusting the relationship between the water activity and moisture content in the paper towel, the frictional force of the high-moisture paper towel coated with sodium hyaluronate can be significantly reduced. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 10 is a schematic diagram illustrating a method for testing frictional force in Experimental Example 3. [Figure 2A]FIG. 1 is a schematic diagram of the fiber arrangement of the hyaluronic acid-containing paper towel in Case 2 in its original state. [Figure 2B] FIG. 10 is a schematic diagram of the fiber arrangement when the hyaluronic acid-containing paper towel of Case 2 is rubbed once with a pressure of 150 Pa. [Figure 3A] FIG. 10 is a schematic diagram of the fiber arrangement of the paper towel in Case 9 in its original state. [Figure 3B] FIG. 10 is a schematic diagram of the fiber arrangement when the paper towel in Case 9 is rubbed once with a pressure of 150 Pa. [Figure 4A] 1 is a schematic diagram of the fiber arrangement of the paper towel in case 13 in its original state. [Figure 4B] FIG. 10 is a schematic diagram of the fiber arrangement when the paper towel in case 13 is rubbed once with a pressure of 150 Pa. Details of the invention

[0010] The present invention will now be described in detail with reference to the embodiments illustrated in the accompanying drawings. It should be noted that like reference numerals represent like features throughout the drawings. While specific embodiments of the present invention are illustrated in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0011] It should be noted that the specification and claims use specific terms to refer to specific components. Those skilled in the art will understand that different nouns may be used to refer to the same component. The specification and claims do not use differences in nouns as a way to distinguish between components, but rather use differences in the functions of the components as a basis for distinction. The words "contain" or "include" used throughout the specification and claims are open-ended terms, and should be interpreted as "including but not limited to." The following description is a preferred embodiment for carrying out the present invention, which is intended to illustrate the general principles of the specification and does not limit the scope of the present invention. The scope of protection of the present invention shall be determined by the appended claims.

[0012] From a mechanism perspective, paper towels have two types of cohesive forces: (1) the cohesive force between fibers and (2) the hydrogen bond between water and fibers. If the effect of hydrogen bonds is too strong, the cohesive force between fibers will be weakened. Therefore, by adjusting the hydrogen bond interaction between water and fibers, we can study the friction force of paper towels.

[0013] Based on this, the present invention provides a paper towel containing sodium hyaluronate, wherein the average fiber length of the paper towel is 0.7 to 1.4 mm, the water content of the paper towel is 8 to 20% by weight, and the water activity A of the paper towel satisfies the following formula: A<-13.78×M 2 +4.89×M+0.3, where M is the moisture content in the paper towel.

[0014] For example, the average fiber length of the paper towel can be 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, or any range therebetween.

[0015] The moisture content in the paper towel can be 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20% by weight, or any range therebetween.

[0016] In the present invention, by controlling the average fiber length of the paper towel within the above range, the water activity and moisture content of the paper towel satisfy the above relationship, thereby reducing the frictional force of the paper towel, i.e., the paper towel has a lower coefficient of friction.

[0017] In the present invention, the average fiber length refers to the arithmetic mean of the fiber lengths, i.e., the arithmetic mean of the lengths of 5,000 fibers measured automatically using an apparatus. The fiber length may be measured using a method known to those skilled in the art, for example, the fiber length measured according to the method specified in International Standard ISO 16065-2.

[0018] In one embodiment, the paper towel contains sodium hyaluronate and a water activity regulator, preferably 40 to 1600 parts by weight of the water activity regulator per 1 part by weight of sodium hyaluronate.

[0019] For example, based on 1 part by weight of sodium hyaluronate, the water activity regulator can be 40 parts by weight, 100 parts by weight, 130 parts by weight, 110 parts by weight, 250 parts by weight, 500 parts by weight, 550 parts by weight, 650 parts by weight, 700 parts by weight, 750 parts by weight, 800 parts by weight, 850 parts by weight, 900 parts by weight, 1000 parts by weight, 1300 parts by weight, 1600 parts by weight, or any range therebetween.

[0020] In one embodiment, the molecular weight of the sodium hyaluronate is 10w to 250w Da.

[0021] For example, the molecular weight of the sodium hyaluronate can be 10w Da, 20w Da, 30w Da, 50w Da, 100w Da, 150w Da, 200w Da, 250w Da, or any range therebetween.

[0022] In one embodiment, the water activity adjusting agent is a substance containing a hydroxyl group, a carboxyl group, or an aldehyde group, preferably glycerin, sucrose, glucose, fructose, polyethylene glycol, butylene glycol, pentylene glycol, mannitol, sorbitol, polysorbate, or a combination thereof.

[0023] For example, the water activity regulator may be a combination of glycerin and butylene glycol, or a combination of glycerin, sucrose and butylene glycol, or a combination of glycerin, butylene glycol and pentylene glycol, or a combination of sucrose, butylene glycol and polyethylene glycol.

[0024] In the present invention, there are no limitations on the mass ratio of the various substances in the above combination and the molecular weight of polyethylene glycol, and these can be selected as needed. For example, when the water activity regulator is a combination of glycerin and butylene glycol, the mass ratio of the two (m グリセリン :m ブチレングリコール When the water activity regulator is a combination of glycerin and butylene glycol, the mass ratio (m グリセリン :m ブチレングリコール When the water activity adjusting agent is a combination of glycerin, sucrose, and butylene glycol, the mass ratio of the three (m グリセリン :m スクロース :m ブチレングリコール When the water activity regulator is a combination of glycerin, butylene glycol, and pentylene glycol, the mass ratio (m グリセリン :m ブチレングリコール :m ペンチレングリコールWhen the water activity regulator is a combination of glycerin, butylene glycol, and pentylene glycol, the mass ratio (m グリセリン :m ブチレングリコール :m ペンチレングリコール When the water activity adjusting agent is a combination of sucrose, butylene glycol, and polyethylene glycol (molecular weight 2000 Da), the mass ratio (m スクロース :m ブチレングリコール :m ポリエチレングリコール ) may be 8:1.5:0.5.

[0025] In one embodiment, the content of the sodium hyaluronate on the paper towel is 40 to 5700 ppm.

[0026] The content described here refers to the total content on the paper towel measured in the following examples.

[0027] For example, the sodium hyaluronate content on the paper towel can be 40 ppm, 80 ppm, 100 ppm, 500 ppm, 1000 ppm, 1500 ppm, 2000 ppm, 2500 ppm, 3000 ppm, 3500 ppm, 4000 ppm, 4500 ppm, 5000 ppm, 5500 ppm, 5700 ppm, or any range therebetween.

[0028] In one embodiment, the cellulose content of the paper towel is 50% or more of the total mass of the paper towel.

[0029] For example, the cellulose content of the paper towel can be 50%, 60%, 70%, etc., of the total weight of the paper towel, or any range therebetween.

[0030] In one embodiment, the paper towel further comprises an essential oil or essence.

[0031] In one embodiment, the paper towel further comprises a skin care ingredient, the skin care ingredient being a skin care ingredient other than sodium hyaluronate, which skin care ingredients are known to those skilled in the art and can be routinely selected as needed.

[0032] In one embodiment, the paper towel has a basis weight of 10 to 200 gsm.

[0033] Setting the basis weight within this range will result in better texture. This basis weight is known in the art as a basis weight for everyday paper. Paper towels below 10 gsm have problems with paper strength, and paper towels above 200 gsm are too hard to be used as everyday paper.

[0034] For example, the basis weight of the paper towels can be 10 gsm, 20 gsm, 50 gsm, 100 gsm, 150 gsm, 200 gsm, or any range therebetween.

[0035] In one embodiment, the coefficient of friction of the paper towel is 0.82 or less, such as 0.73 or less, 0.71 or less, 0.70 or less, 0.69 or less, 0.68 or less, 0.66 or less, 0.65 or less, 0.64 or less, 0.63 or less, etc.

[0036] The coefficient of friction was measured using the method shown in Figure 1. In the figure, P5-1 and P5-2 represent paper towels obtained in the same Example or Comparative Example.

[0037] In one embodiment, the paper towel may have an embossed or perforated design.

[0038] In one embodiment, the paper towel may be white or colored.

[0039] In one embodiment, the paper towel has an average fiber length of 0.7 to 1.4 mm, a moisture content of 8 to 20% by weight, and a water activity A of the paper towel is calculated based on the following formula: A<-13.78×M 2 +4.89×M+0.3, where M is the water content in the paper towel. The paper towel contains sodium hyaluronate and a water activity regulator, preferably in an amount of 40 to 1600 parts by weight of the water activity regulator per 1 part by weight of sodium hyaluronate.

[0040] In one embodiment, the paper towel has an average fiber length of 0.7 to 1.4 mm, a moisture content of 8 to 20% by weight, and a water activity A of the paper towel is calculated based on the following formula: A<-13.78×M 2 +4.89×M+0.3, where M is the water content in the paper towel. The paper towel contains sodium hyaluronate and a water activity regulator, preferably 40 to 1600 parts by weight of the water activity regulator per 1 part by weight of sodium hyaluronate, and the molecular weight of the sodium hyaluronate is 10w to 250w Da.

[0041] In one embodiment, the paper towel has an average fiber length of 0.7 to 1.4 mm, a moisture content in the paper towel is 8 to 20% by weight, and a water activity A of the paper towel is calculated based on the following formula: A<-13.78×M 2 +4.89×M+0.3, where M is the water content of the paper towel. The paper towel contains sodium hyaluronate and a water activity regulator. Preferably, the amount of the water activity regulator is 40 to 1600 parts by weight per part by weight of sodium hyaluronate, the molecular weight of the sodium hyaluronate is 10 to 250 Da, and the water activity regulator is a substance containing a hydroxyl group, a carboxyl group, or an aldehyde group, and is preferably glycerin, sucrose, glucose, fructose, polyethylene glycol, butylene glycol, pentylene glycol, mannitol, sorbitol, polysorbate, or a combination thereof.

[0042] In one embodiment, the paper towel has an average fiber length of 0.7 to 1.4 mm, a moisture content in the paper towel is 8 to 20% by weight, and a water activity A of the paper towel is calculated based on the following formula: A<-13.78×M 2 +4.89×M+0.3, where M is the water content in the paper towel. The paper towel contains sodium hyaluronate and a water activity regulator. Preferably, the amount of the water activity regulator is 40 to 1600 parts by weight per part by weight of sodium hyaluronate, the molecular weight of the sodium hyaluronate is 10w to 250w Da, the water activity regulator is a substance containing a hydroxyl group, a carboxyl group, or an aldehyde group, and is preferably glycerin, sucrose, glucose, fructose, polyethylene glycol, butylene glycol, pentylene glycol, mannitol, sorbitol, polysorbate, or a combination thereof, and the content of the sodium hyaluronate on the paper towel is 40 to 5700 ppm. Preferably, the cellulose content of the paper towel is 50% or more of the total mass of the paper towel. Preferably, the paper towel further contains an essential oil or essence. Preferably, the paper towel further comprises a skin care ingredient. Preferably, the paper towel has a basis weight of 10 to 200 gsm.

[0043] The present invention allows the frictional force of a paper towel with a high water content to be adjusted by incorporating sodium hyaluronate and a water activity regulator into the paper towel, thereby making it possible to reduce the coefficient of friction of the paper towel to 8.2 or less.

[0044] The present invention provides a paper towel finishing liquid containing hyaluronic acid and a water activity regulator, preferably in an amount of 40 to 1600 parts by weight of the water activity regulator relative to 1 part by weight of sodium hyaluronate, Preferably, the molecular weight of the sodium hyaluronate is 10w to 250w Da, Preferably, the water activity regulator is a substance containing a hydroxyl group, a carboxyl group or an aldehyde group, preferably glycerin, sucrose, glucose, fructose, polyethylene glycol, butylene glycol, pentylene glycol, mannitol, sorbitol, polysorbate, or a combination thereof.

[0045] The present invention provides a method for producing paper towels by spray coating a paper towel substrate with a solution containing hyaluronic acid and a water activity regulator.

[0046] The paper towel base material may be any commercially available base material, and for example, the following paper towel base materials can be used.

[0047] The paper towel base comprises approximately 80-95% by weight of cellulose fibers, approximately 3-7% by weight of moisture, and approximately 0.5-3% by weight of a wet strength agent, where the cellulose fibers are a mixture of softwood pulp, hardwood pulp, and recycled pulp in certain proportions.

[0048] The softwood pulp refers to cellulose fibers obtained by physically and chemically refining softwood such as larch, pine, and spruce.

[0049] The hardwood pulp refers to cellulose fibers obtained by physically and chemically refining hardwoods such as poplar, basswood, eucalyptus, maple, and birch. The recycled pulp refers to cellulose fibers obtained by physically and chemically removing impurities from recycled paper products and refining them. The wet strength agent is a polyvinyl acetate-based material, which undergoes a crosslinking reaction under high temperature conditions when the paper is dried, thereby improving the wet strength of the paper towel.

[0050] Here, the fiber length of softwood pulp is about 2 to 3 mm, the fiber length of hardwood pulp is about 0.4 to 1.2 mm, and the fiber length of recycled pulp is about 0.2 to 0.4 mm.

[0051] In the examples, the chemical composition of the paper towel base is the same, but the average fiber length is different, which is achieved by different slurry ratios. In the examples, a total of three different slurry ratios were selected as follows: Cases 1 to 23 and 30 to 37 used the same slurry ratio: softwood pulp (by weight): hardwood pulp (by weight): recycled pulp (by weight) = 1:4:0. The difference in average fiber length in the tests was due to the distribution of fiber lengths in the slurry and not due to changes in the blending ratio. Cases 24 to 26 used the same slurry ratio: softwood pulp (by weight): hardwood pulp (by weight): recycled pulp (by weight) = 3:1:0. The difference in average fiber length in the tests was due to the distribution of fiber lengths in the slurry and not due to changes in the blend ratio. Cases 27 to 29 used the same slurry ratio: softwood pulp (by weight): hardwood pulp (by weight): recycled pulp (by weight) = 0.3:1:4. The difference in average fiber length in the tests was due to the distribution of fiber lengths in the slurry and not due to changes in the blend ratio.

[0052] The solution containing hyaluronic acid and a water activity regulator refers to a solution in which hyaluronic acid and a water activity regulator are dissolved in water.

[0053] In one embodiment, the molecular weight of the sodium hyaluronate is 10w to 250w Da.

[0054] In one embodiment, the content of the sodium hyaluronate on the paper towel is 40 to 5700 ppm.

[0055] In one embodiment, the water activity adjusting agent is a substance containing a hydroxyl group, a carboxyl group, or an aldehyde group, preferably glycerin, sucrose, glucose, fructose, polyethylene glycol, butylene glycol, pentylene glycol, mannitol, sorbitol, polysorbate, or a combination thereof.

[0056] In one embodiment, the amount of the water activity regulator is 40 to 1600 parts by weight per part by weight of sodium hyaluronate.

[0057] This means that when 1 part by weight of sodium hyaluronate is added to a solution containing sodium hyaluronate and a water activity regulator, 40 to 1600 parts by weight of the water activity regulator must be added.

[0058] The paper towel obtained by the present invention has an average fiber length of 0.7 to 1.4 mm, a water content in the paper towel of 8 to 20%, and a water activity A of the paper towel calculated by the following formula: A<-13.78×M 2 +4.89×M+0.3, where M is the moisture content in the paper towel.

[0059] The resulting paper towel has low friction, with a coefficient of friction of 0.82 or less. The resulting paper towel contains hyaluronic acid and a water activity regulator, and by adjusting the relationship between the water activity and moisture in the paper towel, the friction of the paper towel can be significantly reduced. [Example]

[0060] The present invention provides general and / or specific descriptions of the materials and test methods used in the tests. In the following examples, unless otherwise specified, % means weight percent, i.e., percentage by weight. Unless the manufacturer of the reagents or equipment used is specified, they are all commercially available conventional reagent products. Among these, sodium hyaluronate was purchased from Huaxi Biological Jinan Factory. In the examples, the chemical compositions of the paper towel substrates are the same, but the average fiber lengths are different. This is due to the different slurry ratios. The fiber substrates contain approximately 91% cellulose fiber, approximately 7% moisture, and approximately 2% wet strength agent. The softwood pulp is made from southern American pine, the hardwood pulp is made from eucalyptus, and the wet strength agent is VINNAPAS®-192 from Wacker Chemie AG.

[0061] Example 1 Sodium hyaluronate and a water activity regulator with different molecular weights were dissolved in deionized water to obtain solutions, which were then applied to a paper towel substrate to obtain paper towels. The contents of the sodium hyaluronate and water activity regulator in the solutions were as shown in Table 1 for Cases 9 to 23 and 30 to 37. The paper towel substrate also used the same slurry ratio of softwood pulp (by weight): hardwood pulp (by weight): recycled pulp (by weight) = 1:4:0.

[0062] Comparative Example 1 Sodium hyaluronate and a water activity regulator with different molecular weights were dissolved in deionized water to obtain solutions, which were then applied to a paper towel substrate to obtain paper towels. The contents of the sodium hyaluronate and water activity regulator in the solutions were as shown in Table 1 for Cases 1 to 8 and 24 to 29. The paper towel substrate in Cases 1 to 8 used the same slurry ratio of softwood pulp (by weight): hardwood pulp (by weight): recycled pulp (by weight) = 1:4:0. The paper towel base materials in Cases 24 to 26 used the same slurry ratio of softwood pulp (weight): hardwood pulp (weight): recycled pulp (weight) = 3:1:0. The paper towel substrates in Cases 27 to 29 used the same slurry ratio of softwood pulp (weight): hardwood pulp (weight): recycled pulp (weight) = 0.3:1:4.

[0063] [Table 1-1]

[0064] [Table 1-2]

[0065] Experimental Example 1 Measurement of HA and moisture content in paper towels Measurement of HA: Measurement was performed using the method described in CN109298112A, and the results are shown in Table 2. Measurement of moisture content: The weight of one paper towel prepared in Example 1 and Comparative Example 1 was accurately measured using an analytical balance and recorded as W1. If the paper towel was constructed by stacking multiple low basis weight paper towel substrates, the total weight of the stack was measured and recorded as W1. The paper towels were placed in a 105°C (+ / - 2°C) oven and allowed to dry for 30 minutes (+ / - 1 minute). They were quickly removed and placed on an analytical balance within 20 seconds, and the weight was read and recorded as W2. Because there is some water vapor in the air and dry paper towels will continue to absorb moisture from the environment, the weight must be measured and recorded within 20 seconds of removal from the oven. The moisture content M = (W1 - W2) / W1, and the results are shown in Table 2.

[0066] [Table 2]

[0067] Experimental Example 2: Measuring the water activity of paper towels A Swiss ROTRONIC Hygrolab-C1-SET benchtop water activity meter or equivalent equipment was used. One paper towel from each of Example 1 and Comparative Example 1 was taken and placed in a sample pool for water activity detection. The weight of the paper towel must be 1.0 g or more. If the weight of the paper towel is less than 1.0 g, several paper towels are stacked so that the total weight of the paper towels exceeds 1.0 g. Next, the sample pool was sealed with a test probe and left to stand at 25°C (+ / - 2°C) for 1 hour. After the water activity reached a stable value, the water activity was recorded. Each sample was measured three times and the average value was calculated. The results are shown in Table 3.

[0068] [Table 3]

[0069] The moisture content of the paper towel of Example 1 obtained in Experimental Example 2 and the water activity of the paper towel of Example 1 obtained in this Experimental Example were fitted using the least squares method to obtain the following equation: A<-13.78×M 2 +4.89×M+0.3, where M is the moisture content in the paper towel of Example 1.

[0070] Experimental Example 3: Measurement of friction coefficient First, to determine the acceptable threshold for friction for paper towels, friction tests and blind consumer tests were conducted using various commercially available paper products. The consumers in the blind consumer test were 30 female white-collar workers in Beijing, aged 19 to 40. Each subject touched four samples (Ctrl, B1L, B1M, and B1H) and scored them according to their softness. 1 was the worst and 10 was the best. The results are shown in Table 5. Table 4 shows the information for the four samples.

[0071] [Table 4]

[0072] [Table 5]

[0073] As can be seen from the table above, a coefficient of friction of 0.82 is the acceptable threshold for frictional force for paper towels. Therefore, the coefficients of friction of the paper towels of Example 1 and Comparative Example 1 were measured. The measurement method was as follows. Friction force testing was performed using a PARAM® MXD-02 friction coefficient meter or equivalent device, and the specific test method is shown in Figure 1. The friction force detection device consists of a horizontal platform P1, a movable pressure block P2, a motor P3 equipped with a tension sensor, and a rigid pulling rope P4. Test paper towels P5-1 and P5-2 (paper towels from Example 1 and Comparative Example 1) were fixed to the surfaces of P1 and P2, respectively. During the test, the movable sliding block P2 moved horizontally at a uniform speed of 150 mm / min towards P3 under the tow of a rigid traction rope P4. The mass of the movable sliding block P2 was MP = 100 g and the area SP = 64 cm. 2 The process of moving at a uniform speed ensures that all test surfaces of P5-2 are within the area of ​​P5-1. In uniform motion, the average friction force is recorded as FA, i.e., coefficient of friction CoF = FA / (MP*g), where g = 9.8 m / s 2 The results are shown in Table 6.

[0074] [Table 6]

[0075] Experimental Example 4: Measurement of fiber length of paper towels The test was conducted in accordance with International Standard ISO 16065-2, and fiber length analysis was performed at 5,000 points for each sample. The results are shown in Table 7. The paper towel in Case 1 was photographed using a transmission electron microscope (Hitachi High-Tech AeroSurf1500 benchtop scanning electron microscope) before and after rubbing, and the TEM images of the fiber alignment are shown in Figures 2A and 2B. Similarly, the fiber alignments of Cases 9 and 13 before and after rubbing are shown in Figures 3A and 3B, and Figures 4A and 4B, respectively.

[0076] [Table 7]

[0077] As can be seen from Figures 3A and 3B and Figures 4A and 4B, the interface of the paper towels in Cases 9 and 13 after friction shows the fibers spread out flat, while Figures 2A and 2B show the phenomenon of fiber cohesion being peeled off. This indicates that adjusting the water activity does not change the cohesion between fibers, but reduces the frictional force of the paper towels of the present invention. Furthermore, the frictional force data measured in the experimental example indicates that the coefficient of friction of the paper towel in Case 2 after friction was 0.97, which is higher than the coefficient of friction of 0.91 for the paper towel substrate not coated with sodium hyaluronate. As can be seen from Table 7, the average fiber length of the paper towels of the present invention is 0.7 to 1.4 mm, and the difference in average fiber length in the test is due to the distribution of fiber lengths in the slurry, not due to the blending ratio.

[0078] As described above, when the average fiber length of the paper towel of the present invention is 0.7 to 1.4 mm, the coefficient of friction of the paper towel can be reduced to 0.82 or less by adjusting the water content and water activity in the paper towel.

[0079] The above is merely a preferred embodiment of the present invention, and is not intended to limit the present invention to other forms. Those skilled in the art can use the technical content disclosed above to make equivalent modifications or modifications to equivalent embodiments. However, any simple modifications, equivalent modifications, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A paper towel containing sodium hyaluronate and a water activity regulator, wherein the paper towel has an average fiber length of 0.7 to 1.4 mm, a water content of 8 to 20% by weight, and a water activity A of the paper towel satisfying the following formula: A<-13.78×M ２ + 4.89 × M + 0.3, where M is the moisture content in the paper towel; The paper towel comprises 40 to 1600 parts by weight of the water activity regulator relative to 1 part by weight of the sodium hyaluronate.

2. 10. The paper towel of claim 1, wherein the sodium hyaluronate has a molecular weight of 10w to 250w Da.

3. 10. The paper towel of claim 1, wherein the water activity control agent is a material containing a hydroxyl group, a carboxyl group, or an aldehyde group.

4. The paper towel of claim 1, wherein the water activity regulator is glycerin, sucrose, glucose, fructose, polyethylene glycol, butylene glycol, pentylene glycol, mannitol, sorbitol, polysorbate, or a combination thereof.

5. The paper towel according to any one of claims 1 to 4, wherein the content of the sodium hyaluronate on the paper towel is 40 to 5700 ppm relative to the paper towel.

6. The paper towel according to any one of claims 1 to 4, wherein the cellulose content of the paper towel is 50% or more of the total mass of the paper towel.

7. The paper towel of any one of claims 1 to 4, wherein the paper towel further contains an essential oil or essence.

8. A paper towel described in any one of claims 1 to 4, wherein the paper towel further contains a skin care ingredient.

9. A paper towel described in any one of claims 1 to 4, wherein the basis weight of the paper towel is 10 to 200 gsm.

10. A paper towel finishing liquid comprising sodium hyaluronate and a water activity regulator, wherein the amount of the water activity regulator is 40 to 1600 parts by weight per 1 part by weight of the sodium hyaluronate.

11. The paper towel finishing solution of claim 10, wherein the sodium hyaluronate has a molecular weight of 10w to 250w Da.

12. A paper towel finishing liquid as described in claim 10, wherein the water activity regulator is a substance containing a hydroxyl group, a carboxyl group, or an aldehyde group.

13. The paper towel finishing liquid of claim 10, wherein the water activity regulator is glycerin, sucrose, glucose, fructose, polyethylene glycol, butylene glycol, pentylene glycol, mannitol, sorbitol, polysorbate, or a combination thereof.

14. The paper towel is obtained by spray coating a solution containing sodium hyaluronate and a water activity regulator onto a paper towel substrate. The amount of the water activity regulator is 40 to 1600 parts by weight per part by weight of the sodium hyaluronate. The method for producing the paper towel of claim 1 .

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