JP7572666B2 - Wiping sheet and method for producing same - Google Patents

Description

The present invention relates to a wiping sheet capable of providing a cool and refreshing feeling for a long period of time when used to wipe human skin , and a method for producing the same .

One of the symbols of recent climate change is the so-called extreme heat. In response to such weather conditions, so-called cooling goods, such as cleaning sheets that provide a cooling sensation, are in demand on the market and are being provided.
Many of these contain menthol or alcohol in the medicinal solution to impart a cooling sensation, or contain fine solid particles such as talc or spherical silica to impart a so-called dry feeling (see, for example, Patent Documents 1 to 5).
However, such conventional techniques generally fail to overcome the following shortcomings.

First, menthol, which is used to give a cooling sensation, stimulates TRP channels (sensory receptors) to give a cooling sensation, but does not actually lower the skin temperature, and the cooling sensation does not last for a long period of time.Furthermore, it is accompanied by irritation to the skin.
And while alcohol does indeed lower skin temperature through its latent heat of vaporization, the effect does not last long because it is highly volatile.
Furthermore, while chemically synthesized ingredients such as trans-4-tert-butylcyclohexanol are often used to impart a cooling sensation, there are few naturally occurring ingredients.
Furthermore, among conventional wiping sheets, there are some that have an improved sheet shape that allows for a strong cooling sensation, but in this case the sheet structure is complicated and the cost is high.

Furthermore, solid ingredients such as talc that give the material a smooth feel tend to settle at the bottom of the solution in the raw material tank. When this is sprayed onto nonwoven fabric in the next process to impregnate it, it is difficult to achieve a completely uniform dispersion, even if a stirring device is used to disperse the ingredients in the raw material tank, which can lead to product variation.

Japanese Patent Application Publication No. 8-71099 JP 2014-100250 A JP 2015-124146 A JP2018-126450A JP 2018-123094 A

The present invention was made in consideration of the above background, and the technical objective of the present invention is to develop a wiping sheet and a manufacturing method thereof that can give the user a "cool and refreshing feeling" for a long period of time.
In this case, the term "cool and refreshing sensation" refers to the sensation felt when wiping the skin, and refers to a sensory state that includes a so-called refreshing sensation of dryness as well as a cool and refreshing sensation.

That is, the cleaning sheet according to claim 1 is a mixture of water , alcohol , talc particles that produce a refreshing sensation, and cellulose nanofibers (CNF) having a width of 3 to 100 nm and added at a solid content ratio of 0.1 to 1 % ,
The composition is characterized in that the refreshing sensation-producing particles are encapsulated and/or supported in a three-dimensional network formed by cellulose nanofibers (CNF) , and the mixed mass of cellulose nanofibers (CNF) per mass of talc is 0.1 to 1.0, and the base fabric sheet is impregnated with a cool refreshing sensation-lasting chemical solution .

In addition to the above requirements, the wiping sheet described in claim 2 is characterized in that a blank material comprising a plurality of base fabric sheets is half-covered with a packaging material, and the cool and refreshing sensation-lasting liquid medicine is sprayed individually onto the covered blank material, thereby impregnating the base fabric sheets with the cool and refreshing sensation-lasting liquid medicine and forming an individual package.

The wiping sheet according to claim 3 is characterized in that, in addition to the requirements of claim 1 or 2 , the impregnation rate of the cool and refreshing sensation sustaining liquid relative to the base fabric sheet is 2 to 5 times by weight.

In addition to the requirements of claims 1 and 3 , the cleaning sheet according to claim 4 has the following properties:
When the product is applied to the user's body twice,
It is characterized in that the difference in skin temperature at the application site after 30 seconds is -3°C or more.

In addition to the requirements of claims 1 and 3 , the cleaning sheet according to claim 5 has the following properties:
When the product is applied to the user's body twice,
The skin temperature at the application site was lower than that when a cleaning sheet impregnated with a medicinal solution that did not contain cellulose nanofiber (CNF) was used.
It is characterized in that the above-mentioned state is maintained for 210 seconds or more.

Furthermore, the method for producing a cleaning sheet according to claim 6 includes charging water , alcohol , talc particles that exhibit a cool and refreshing effect , and cellulose nanofibers (CNF) into a stirring vessel , and the cellulose nanofibers (CNF) have a width of 3 to 100 nm and are added at a ratio of 0.1 to 1% by weight of solid content,
The mixing ratio of talc to cellulose nanofiber (CNF) is 1 part by mass of talc to 0.1 to 1.0 parts by mass of cellulose nanofiber (CNF),
The mixture is stirred in the stirring vessel to obtain a cool and refreshing sensation sustaining medicinal solution in which the refreshing sensation-producing particles are encapsulated and/or supported in the three-dimensional network formed by the cellulose nanofibers (CNFs),
The present invention is characterized in that the liquid cool and refreshing sensation sustaining agent is impregnated into a base fabric sheet .

Furthermore, the method for manufacturing a wiping sheet according to claim 7 , in addition to the requirements of claim 6 , is characterized in that a blank material comprising a plurality of base fabric sheets is half-covered with a packaging material, and the cool and refreshing sensation-lasting chemical liquid is individually sprayed onto the covered blank material, thereby impregnating the base fabric sheets with the cool and refreshing sensation-lasting chemical liquid and forming them into individual packages.

Furthermore, the method for producing a wiping sheet according to claim 8 is characterized in that, in addition to the requirements of claim 6 or 7 , the impregnation rate of the cool and refreshing sensation sustaining liquid relative to the base fabric sheet is 2 to 5 times by weight.
The above problems are solved by the configurations of the inventions described in each of these claims.

First, according to the invention described in claims 1 and 6 , by the simple method of adding cellulose nanofiber (CNF) to a mixture of water and alcohol, it is possible to obtain a medicinal solution that can lower the skin temperature for a long period of time and provide a long-lasting cooling sensation.
In addition, the dispersibility of the refreshing sensation imparting particles can be maintained well.
Furthermore, cellulose nanofiber (CNF) is a natural material derived from biomass and is highly safe. It is not irritating like menthol, making it suitable for use on sensitive skin and for infants.
Furthermore, the addition of cellulose nanofibers (CNF) can improve the durability of the cool sensation and the dispersibility of the refreshing sensation-imparting particles.
Talc also provides a good refreshing feeling, i.e., a dry feeling, and also makes it possible to maintain the uniform dispersion of the particles that impart a refreshing feeling for 24 hours or more.
It is also possible to provide a wiping sheet that can provide a good "cool and refreshing feeling."

According to the invention as set forth in claims 2 and 7 , it is possible to efficiently produce individually packaged wiping sheets as distributable products.

According to the invention described in claims 3 and 8 , the impregnation rate of the cool and refreshing sensation-lasting medicinal liquid can be set to an appropriate level so that the skin is wetted by wiping in a manner suitable for providing a "cool and refreshing sensation."

According to the invention described in claims 4 and 5 , a wiping sheet having a base fabric sheet impregnated with a cool and refreshing sensation-lasting chemical liquid containing cellulose nanofiber (CNF) can provide an excellent cool and refreshing sensation.

FIG. 1 is a side view showing the state in which the forearm of a user is wiped with the wiping sheet of the present invention, and a conceptual diagram showing an enlarged view of the refreshing sensation-producing particles and cellulose nanofibers (CNF) in a cool and refreshing sensation-lasting chemical liquid. FIG. 1 is a front view showing the difference in dispersibility of talc in samples containing different amounts of cellulose nanofiber (CNF). FIG. 2 is a perspective view showing a process of producing a wiping sheet package by impregnating a base fabric sheet contained in a packaging material with a cool and refreshing sensation sustaining chemical liquid. 1 is a graph showing the application time-dependent surface temperature difference characteristics of water and a 0.3 wt % aqueous solution of CM-CNF. 1 is a graph showing the application time-dependent surface temperature difference characteristics of a chemical solution containing cellulose nanofiber (CNF) and a chemical solution not containing CNF. 1 is a graph showing the surface temperature difference characteristics versus application time for a chemical solution containing cellulose nanofiber (CNF) and a chemical solution not containing CNF.

The best mode for carrying out the present invention is described below, but it is possible to make appropriate modifications to this mode within the scope of the technical concept of the present invention.

[Long-lasting cool and refreshing liquid medicine]
First, the cool and refreshing sensation sustaining liquid medicine 1 will be described.
The cool and refreshing sensation lasting drug solution 1 is prepared by mixing a mixture of water 2 and alcohol 3 with refreshing sensation producing particles 4 and cellulose nanofibers (hereinafter referred to as CNF) 5 .
The alcohol 3 is intended to give the user a "cool feeling" due to the heat of vaporization, mainly together with the water 2, while the refreshing particles 4 are intended to give the user a "refreshing feeling", which is a so-called light, dry feeling.
The cool and refreshing lasting medicinal liquid 1 allows the user to feel both a "cool feeling" and a "refreshing feeling", thereby giving the user a "cool and refreshing feeling".
In the cool and refreshing lasting medicinal liquid 1, the CNF 5 forms a three-dimensional network with the water 2 and alcohol 3 to retain them, and the user is also given a "cool feeling" caused by the heat absorption of the retained water 2 and alcohol 3. In other words, in the cool and refreshing lasting medicinal liquid 1, the synergistic effect of the "cool feeling" caused by the heat of vaporization of the water 2 and alcohol 3 and the "cool feeling" caused by heat absorption makes it possible to lower the skin temperature for a long period of time and to give the user a "cool feeling."
Moreover, a lotion component and a fragrance component may be added to the water 2.

As the alcohol 2, ethanol is used as an example.
As the refreshing sensation imparting particles 4, for example, talc (a plate-like clay mineral made of hydrated magnesium silicate) is used, and the particle size is 5 to 20 μm, preferably 5 to 15 μm, and more preferably 5 to 10 μm.
As the refreshing particles 4, silica and the like can also be used in addition to the talc.
The amount of the refreshing particles 4 added to the cool and refreshing lasting medicinal liquid 1 is in the range of 0.01 to 5% by weight, preferably 0.01 to 1% by weight, and more preferably 0.01 to 0.1% by weight, in order to give the user a good "refreshing feeling."

As the CNF 5, for example, carboxymethylated CNF (hereinafter referred to as CM-CNF) is adopted, and its characteristics are that the width is 3 to 100 nm, preferably 3 to 80 nm, and more preferably 3 to 50 nm.
The amount of CNF5 added to the cool and refreshing sensation sustaining liquid medicine 1 is in the range of 0.1 to 1% by weight, preferably 0.1 to 0.5% by weight, and more preferably 0.1 to 0.2% by weight, in terms of solid content.
The amount of CNF5 added is an appropriate amount according to the amount of talc added as the refreshing sensation imparting particles 4, as described below.
Furthermore, the CNF5 is classified into chemically defibrated cellulose nanofibers (CNF) and mechanically defibrated cellulose nanofibers (CNF) based on the manufacturing method, but both can be used in the present invention.

[Method of producing a liquid medicine with a long-lasting cool sensation]
Next, a method for producing the cooling and refreshing sensation-promoting liquid medicine 1 will be described.
To obtain the cool and refreshing sensation sustaining liquid medicine 1, water 2, CNF 5, alcohol 3 and cool and refreshing particles 4 are charged into a stirring vessel and stirred.

In the thus obtained cool and refreshing sensation-prone drug solution 1, the CNF5 forms a three-dimensional network with water and ethanol, and the refreshing sensation-producing particles 4 are encapsulated in the three-dimensional network formed by the CNF5 as shown in FIG. 1(a), or the refreshing sensation-producing particles 4 are supported by the CNF5 as shown in FIG. 1(b).

[ Method of manufacturing wiping sheet]
Next, a method for producing the wiping sheet 7 of the present invention will be described.
The wiping sheet 7 of the present invention is obtained by impregnating the cool and refreshing sensation sustaining liquid medicine 1 into a nonwoven fabric sheet (mesh type, plain type, etc.), which is an example of the base fabric sheet 6. The material of the base fabric sheet 6 may be a plastic material, a paper material, a cloth material, or a mixture of these materials.
The base fabric sheet 6 is impregnated with the cool and refreshing sensation sustaining liquid medicine 1 when the base fabric sheet 6 is packaged in a packaging material 8 to obtain a package P, as shown in FIG.
Specifically, as shown in Fig. 3(a), so-called pillow packaging is performed, in which weakened lines 61 are formed at regular intervals to connect a plurality of base fabric sheets 6 so that the base fabric sheets 6 can be used as a single sheet when in use, and a blank material 62 wound into a roll is semi-covered by wrapping it in a sheet-like packaging material 8, and the covered blank material 62 is impregnated with a cool and refreshing sensation sustaining chemical solution 1 supplied from a nozzle N to obtain a wiping sheet 7. Next, the seams of the packaging material 8 are sack-sealed and partitioned at regular intervals, and the partitioned portions are cut to obtain a package P in which the wiping sheets 7 are individually packaged.
As shown by the phantom lines in FIG. 3( a ), the blank material 62 may be a laminate of a certain number of base fabric sheets 6 that have already been formed as a single piece and folded.

In addition to the pillow packaging type described above, the packaging body P can also be in the form shown in Figure 3 (b) in which a blank material 62 is stored in a film container in which the packaging material 8 has been formed into a bag shape in advance, and then the cool and refreshing sensation-lasting medicinal liquid 1 is supplied from a nozzle N to impregnate the blank material 62 to form a wiping sheet 7, and the opening is then sealed to provide an individual package.

When the blank material 62 is thus impregnated with the cool and refreshing sensation sustaining chemical liquid 1, the talc as the refreshing sensation producing particles 4 is uniformly dispersed in the cool and refreshing sensation sustaining chemical liquid 1, and the cool and refreshing sensation sustaining chemical liquid 1 filled in the chemical liquid tank (not shown) is sprayed from the nozzle N with the refreshing sensation producing particles 4 maintained in a state of dispersion, allowing the particles to be uniformly distributed over the base sheet 6, making it possible to manufacture a homogeneous product. Furthermore, because the manufacturing method for the wiping sheet 7 is thus simple, it is possible to shorten the manufacturing time and ensure superiority in terms of cost.

[Verification of the effects of ingredients contained in a cooling and refreshing liquid medicine]
The results of verification of the effects of the ingredients contained in the cool and refreshing sensation sustaining liquid medicine 1 are shown below.
(1) Verification of dispersibility of refreshing particles by addition of cellulose nanofibers (CNF) First, the dispersibility of refreshing particles 4 by addition of CNF 5 was verified. Specifically, as shown in Table 1 below, four types of samples were prepared by setting the addition amount of refreshing particles 4 (talc) to 1 wt % and varying the addition amount of CNF 5, and the samples were thoroughly stirred and then allowed to stand for one day to check the dispersibility of talc.

As shown in Figure 2, the results show that for sample (1), talc settled in one day (24 hours). For sample (2), some settling was observed, but the dispersion was more stable than for sample (1). For samples (3) and (4), no settling of talc was observed even after one day.
From the above results, it was confirmed that by adding an appropriate amount of CNF5 (0.1 part by weight or more and 1.0 part by weight or less, preferably 0.5 part by weight or more and 1.0 part by weight or less, per 1 part by weight of talc, it is possible to suppress the settling of talc as the refreshing sensation imparting particles 4, maintain uniform dispersion, and make the mixture suitable for supply from the nozzle N.

2. Verification of cooling sensation by adding cellulose nanofiber (CNF) Next, the cooling sensation by adding CNF5 was verified.
Specifically, a comparative experiment was conducted between "water" and "aqueous solution of carboxymethylated CNF (hereinafter referred to as CM-CNF 0.3 wt % aqueous solution)."
The experimental method was as follows: a piece of artificial leather measuring 3 cm x 3 cm was placed on a heated hot plate in a constant temperature and humidity room at 28°C and 50% RH, and heated to 34±1°C.
Next, the surface temperature of the heated artificial leather was measured using a thermal imaging device (NEC Sanei Co., Ltd.: TH9100PWV).
Next, a cotton puff soaked in 4 ml of water or a 0.3 wt % aqueous solution of CM-CNF was applied to the artificial leather four times, and the surface temperature was measured immediately after application, and after 30 seconds, 60 seconds, 120 seconds, and 180 seconds.

The analysis method involved determining the analysis range before and after application from the images obtained by the thermal imaging device, and calculating the average skin surface temperature within the determined range.
The difference in surface temperature after application from the surface temperature before application was then calculated, and the skin temperature differences were compared.
As shown in Figure 4, the results confirmed that the surface temperature difference of the artificial leather coated with the "CM-CNF 0.3 wt% aqueous solution" was significantly larger 30 and 60 seconds after application than the surface temperature difference of the artificial leather coated with "water." This confirmed that the addition of CNF5 increases the "cool feeling" and improves its durability.
In the graph of FIG. 4, the surface temperature difference is larger for water at 120 seconds and 180 seconds, but the value is extremely small and is considered to be within the range of measurement error.

Next, an example of the cool and refreshing sensation-prolonging medicinal liquid 1 will be described. The contents of each component are shown below. Also shown is the result of actually wiping the skin of a human body with a wiping sheet 7 impregnated with the cool and refreshing sensation-prolonging medicinal liquid 1, and measuring the temperature during wiping.

Water: 97.7g
Alcohol: 43.2g (ethanol)
Refreshing particles: 0.144 g (talc (particle size 15 μm))
CNF: 0.144g (CM-CNF 0.1wt%)
Base fabric sheet: 40g (mesh type nonwoven fabric sheet)

For comparison, the temperature was also measured for a wiping sheet 7' impregnated with the following chemical solution 1', which had the same composition as the cool and refreshing sensation sustaining chemical solution 1 of the above example, except that it did not contain CNF5.

Water: 97.9g
Alcohol: 43.2g (ethanol)
Refreshing particles: 0.144 g (talc (particle size 15 μm))
Base fabric sheet: 40g (mesh type nonwoven fabric sheet)

The measurement method was to have the subject rest for 15 minutes in a constant temperature and humidity room at 28°C and 50% RH, and to measure the skin temperature of the forearm A before application of the sheet with a thermal imaging device, and then to apply each sheet to the forearm A of the subject in two reciprocating strokes as shown in Figure 1.
The skin temperature was measured at 30-second intervals for 210 seconds after application. The number of subjects was 10. The analysis method was the same as that used for the verification of the cooling sensation.

The results, as shown in Figures 5 and 6, show that when wiping sheet 7 impregnated with CNF5-containing medicinal solution for sustained cool and refreshing sensation 1 was used, the drop in skin temperature (skin temperature difference) was greater in most subjects for most of the time from 30 seconds to 210 seconds after application, compared to when wiping sheet 7' impregnated with medicinal solution not containing CNF5 was used, confirming that CNF5-containing medicinal solution for sustained cool and refreshing sensation 1 can maintain a superior cool and refreshing sensation for a longer period of time (210 seconds or more) than a medicinal solution not containing CNF5.
For subject 2, at 150 seconds and 180 seconds, the temperature difference for the medicinal solution not containing CNF5 was slightly larger (0.1 to 0.2°C) than for the long-lasting cool and refreshing sensation medicinal solution 1 containing CNF5, but at 210 seconds, the values were the same for both, and judging from the overall trend, the values at 150 seconds, 180 seconds, and 210 seconds are considered to be within the range of measurement error.
In addition, for subject 5, at 180 seconds, the temperature difference was very slightly (0.1°C) greater with the drug solution not containing CNF5 than with the long-lasting cool and refreshing feeling drug solution 1 containing CNF5, but at 210 seconds, the temperature difference was greater with the drug solution 1 containing CNF5, and judging from the overall trend, the value at 180 seconds is considered to be within the range of measurement error.

It was also confirmed that in most subjects, the temperature difference after 30 seconds was 3°C or more (-3°C). The average temperature difference after 30 seconds was 3.6°C (-3.6°C), and the maximum was 4.5°C (-4.5°C).

As described above, the cooling and refreshing sensation-prone medicinal liquid 1 can lower the skin temperature for a long period of time and give a "cool feeling" when the user wipes the forearm A or the like using the wiping sheet 7 impregnated with the cooling and refreshing sensation-prone medicinal liquid 1. Furthermore, after the water 2 and alcohol 3 evaporate, the refreshing sensation-producing particles 4 are evenly distributed on the skin surface, so that the "refreshing feeling" can be felt evenly.
Furthermore, CNF5 is a natural material derived from biomass, is highly safe, is not irritating like menthol, and is gentle on the skin, providing a soft, refreshing sensation.

1. Cool and refreshing liquid medicine 2. Water 3. Alcohol 4. Refreshing particles (talc)
5. Cellulose nanofiber (CNF)
6 Base fabric sheet 60 Raw material 61 Weakened line 62 Blank material 7 Cleaning sheet 8 Packaging material A Forearm N Nozzle P Package

Claims (8)

Water , alcohol , talc particles that impart a refreshing sensation, and cellulose nanofibers (CNF) having a width of 3 to 100 nm and added at a solid content ratio of 0.1 to 1% are mixed together ,
The present invention relates to a cleaning sheet, characterized in that the cleaning sheet is formed by impregnating a base fabric sheet with a liquid medicinal solution for providing a lasting cool and refreshing sensation, in which refreshing sensation-producing particles are encapsulated and/or supported in a three-dimensional network formed by cellulose nanofibers (CNF), and the mixed mass ratio of cellulose nanofibers (CNF) to talc mass is 0.1 to 1.0 .
The cleaning sheet according to claim 1, characterized in that a blank material comprising a plurality of base fabric sheets is partially covered with a packaging material, and the cool and refreshing sensation lasting liquid is sprayed individually onto the covered blank material, thereby impregnating the base fabric sheets with the cool and refreshing sensation lasting liquid, thereby forming an individual package.
3. The wiping sheet according to claim 1 , wherein the impregnation rate of the cool and refreshing sensation sustaining liquid relative to the base fabric sheet is 2 to 5 times by weight.
The cellulose nanofiber (CNF)
When the product is applied to the user's body twice,
4. The wiping sheet according to claim 1, wherein the skin temperature difference at the applied site after 30 seconds is -3° C. or more.
The cellulose nanofiber (CNF)
When the product is applied to the user's body twice,
The skin temperature at the application site was lower than that when a cleaning sheet impregnated with a medicinal solution that did not contain cellulose nanofiber (CNF) was used.
4. The wiping sheet according to claim 1 , wherein the moisture retention is maintained for 210 seconds or more.
Water , alcohol , talc particles that exhibit a cooling effect , and cellulose nanofibers (CNF) are charged into a stirring vessel , and the cellulose nanofibers (CNF) have a width of 3 to 100 nm and are added at a ratio of 0.1 to 1% by weight of solid content.
The mixing ratio of talc to cellulose nanofiber (CNF) is 1 part by mass of talc to 0.1 to 1.0 parts by mass of cellulose nanofiber (CNF),
The mixture is stirred in the stirring vessel to obtain a cool and refreshing sensation sustaining medicinal solution in which the refreshing sensation-producing particles are encapsulated and/or supported in the three-dimensional network formed by the cellulose nanofibers (CNFs),
The method for producing a wiping sheet is characterized in that the liquid cool and refreshing sensation-retaining medicinal liquid is impregnated into a base fabric sheet .
The method for manufacturing a cleaning sheet according to claim 6, characterized in that a blank material comprising a plurality of base fabric sheets is half-covered with a packaging material , and the cool and refreshing sensation-retaining liquid medicine is sprayed individually onto the covered blank material, thereby impregnating the base fabric sheets with the cool and refreshing sensation-retaining liquid medicine and forming an individual package.
8. The method for producing a wiping sheet according to claim 6 or 7 , wherein the impregnation rate of the cool and refreshing sensation sustaining liquid relative to the base fabric sheet is 2 to 5 times by weight.

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