JP4833622B2 - Sanitary tissue paper - Google Patents

Description

  The present invention relates to sanitary thin paper such as tissue paper and toilet paper. More specifically, the present invention relates to tissue paper that captures bodily fluids containing viruses such as runny nose.

Conventionally, this type of sanitary thin paper has a problem that it is unsanitary because the nasal fluid may fall through and stick to the hand. Of course, if the sanitary thin papers are stacked in layers, the problem of the show-through is avoided. However, it is uneconomical to stack multiple layers of sanitary thin paper. In addition, when the sanitary thin papers are stacked in layers, the thinness and softness are impaired. Therefore, the merit of recent sanitary thin papers that are rich in thinness and softness is diminished. If you have a cold, a runaway runny nose that contains the virus can touch your hands and cause body infections through food.
Therefore, sanitary thin paper containing an antiviral agent has been proposed as a sanitary thin paper that solves the problem of being unsanitary (see, for example, Patent Document 1).
However, if a liquid containing a virus such as a runny nose breaks through before the antibacterial action of the antiviral agent is manifested, it cannot be a fundamental solution in terms of preventing transmission of infection.
Special table 2003-512542 gazette

  The main subject of this invention is providing the sanitary thin paper which has the characteristics requested | required of sanitary thin paper, such as softness, while being hygienic. Further issues will become clear from the following description.

The present invention that has solved this problem is as follows.
[Invention of Claim 1 ]
3 layers of hygienic tissue paper,
Each layer is a paper layer made from pulp,
Water absorbency of the both outer layers is 5 seconds or more, basis weight is ^{10~20g / m 2 (JIS P 8124} ),
The intermediate layer has a Krem water absorption of 30 mm or more (JIS P 8141), a rice tsubo of 15 to 35 g / m ² (JIS P 8124),
In both the outer layers, a liquid-impermeable chemical solution is contained in an amount of 15 to 30% with respect to the pulp dry mass of each outermost layer,
The liquid holding capacity of the intermediate layer is larger than the liquid holding capacity of both outermost layers,
A sanitary thin paper characterized in that the amount of artificial nasal runthrough in an artificial nasal runthrough test (no load) is 10 mg or less.

(Function and effect)
If it is a three-layer laminated sanitary thin paper, and both outermost layers are paper layers made from pulp, the front and back can be used without distinction, and the touch is excellent, and the intermediate layer is made from pulp. Therefore, the product as a whole is highly flexible.
Increased basis weight of the intermediate layer is from both outer layers, large liquid holding capacity of the intermediate layer is, strike-through reduction effect is high.
Since both outer layers contain liquid-impermeable chemicals, the liquid that has once penetrated into the intermediate layer is confined by both outer layers and can further enhance the effect of reducing the run-through such as runny nose. Since the amount of slip-through is 10 mg or less, it becomes hygienic when a runny nose is bitten or when a contaminated liquid is wiped off.

[Invention of Claim 2 ]
Claim 1 Symbol placement of the sanitary thin paper print-through amount of the artificial runny nose in strike-through test of the artificial runny nose in load conditions (3 seconds at 250g load) is less than 150 mg.

(Function and effect)
The artificial runny nose penetration test under load conditions (250 g load for 3 seconds) is almost identical to the conditions when actually blowing the nose. As far as the present inventors examined, the commercially available product was the lowest value of 153 mg. This commercially available product is known to have a small amount of actual runny nose breakthrough, and from this point, it can be seen that if the amount of artificial runny nose passthrough specified in claim 3 is sufficient, it is possible to prevent the runthrough. . The amount of artificial nasal runthrough is more desirably 90 mg or less.

[Invention of Claim 3 ]
The sanitary thin paper according to claim 1 or 2, wherein the moisture content of the two outer layers is 8 to 15% with respect to the pulp dry mass of each outermost layer.

(Function and effect)
Since the moisture content of both outer layers is 8 to 15%, there is no risk of depriving moisture in the stratum corneum and no risk of stickiness.

[Invention of Claim 4 ]
Layers overlap each other, heat fusion, ultrasonic fusion, according to any one of claims 1 to 3 which is superimposed by one of bonding process selected from the group of pressure-sensitive adhesive and the ply bonding Sanitary tissue paper.

(Function and effect)
Examples of means for overlapping the layers include thermal fusion, ultrasonic fusion, pressure-sensitive adhesive, and ply bonding.

[Invention of Claim 5 ]
Intermediate layer either colored layer is made of sanitary thin paper according to any one of claims 1 to 4 that coloration in the visible relationship from at least one of the outer layer side.

(Function and effect)
Intermediate layer either colored layer is made of, if the coloring structure generates in the viewable relationship from at least one of the outer layer side, it is possible to distinguish the general sanitary thin paper and simple, also for coloring Since the ingredients are not in contact with the skin, rough skin can be prevented.

[Invention of Claim 6 ]
Sanitary thin paper according to any one of claims 1 to 5 products rice basis is 10~55g / m ^2.

(Function and effect)
In the case of a laminated hygienic thin paper of 2 layers or more, especially 3 layers, it is desirable that the excessive rice basis weight is 55 g / m ² or less in order to impair the softness. If the rice tsubo is less than 10 g / m ² , problems such as insufficient liquid absorbency remain.

  It is possible to provide a sanitary thin paper that is hygienic and has the characteristics required for a sanitary thin paper such as softness.

Next, an embodiment of the present invention will be described.
As shown in the drawings, the sanitary thin paper 10 of the present embodiment has a two or more layered layer configuration. Here, the “layer” means a configuration having a predetermined thickness in which the material continuously develops in the planar direction. Therefore, in addition to the one in which a plurality of layers of materials are laminated and integrated (“laminate”), one layer or laminate is regarded as one “ply” and is partially joined to the other ply. Including things. Therefore, the present invention also includes a “ply assembly” having two or more plies.

[Example of structure]
The structure of the sanitary thin paper of the present invention will be described with reference to various embodiments.
In FIG. 1, the outer layer 11 on the use surface side is an absorbent layer of a liquid made from pulp, and the outer layer 12 on the other non-use surface side is a liquid impermeable layer (shown by hatching). . Here, the “liquid impermeable layer” does not mean a layer that does not allow liquid to completely permeate, but means a layer that has low liquid permeability in contrast to the “liquid absorbing layer”.
FIG. 3 shows a liquid-impermeable intermediate layer 30 interposed between the outer layer 11 and the outer layer 12.
In FIG. 4, the intermediate layer 30 of the first intermediate layer 31 and the second intermediate layer 32 is interposed between the outer layer 11 and the outer layer 12. In this case, both or one of the first intermediate layer 31 and the second intermediate layer 32 can be a liquid impermeable layer.
In FIG. 5, the intermediate layer 30 of the first intermediate layer 31, the second intermediate layer 32, and the third intermediate layer 33 is interposed between the outer layer 11 and the outer layer 12. In this case, any one of the first intermediate layer 31, the second intermediate layer 32, and the third intermediate layer 33 can be a liquid-impermeable layer.
FIG. 6 shows a partial joined portion 40 obtained by joining a laminated body of the outer layer 11 and the intermediate layer 31 and a laminated body of the outer layer 12 and the intermediate layer 32 by heat bonding, ultrasonic fusion, adhesive, ply bonding or the like. The ply joint is used.
FIG. 7 shows a laminated body of the outer layer 11 and the intermediate layer 31 and a single outer layer 12 which are ply bonded by the partial bonding portion 40.

  Although these forms are described as examples only, in the present invention, at least one outer layer of the outermost layer is a paper layer made from pulp, and any layer other than this paper layer is liquid-impermeable. It is enough if it is made a sex layer. However, as shown in FIG. 3 and FIG. 4, it is desirable in terms of absorbability of liquid such as runny nose that both the outer layer 11 and the outer layer 12 are paper layers. In particular, a three-layer product is optimal in order not to give excessive rigidity.

  The intermediate layer 30 can be colored. In addition to using materials that are already colored, the colorant is colored by adding dyes or pigments, whether natural or synthetic, to the target layer or the surface of the layer in the manufacturing process of sanitary thin paper. be able to. In addition to coloring the whole, design patterns such as geometric patterns such as circles, triangles, rectangles, plants such as flowers, trees, grass, people, animals, fish, etc. are partially designed with colorants. May be used. Coloring can be visually distinguished from general-purpose tissue paper for the user. An example of the colored layer is shown by hatching with a broken line. If necessary, the outer layer can be colored.

  The above example is an example of a laminate. As the laminating means, heat fusion bonding, ultrasonic fusion bonding, or a means for interposing an adhesive can be employed. These bonding sites may be the entire surface, or may be partial such as a stripe shape, a dotted shape, a lattice shape, or a spiral shape in plan view. In the case where the bonding site is the entire surface, it cannot be said that it is a layer because it is not a different material from the above-mentioned definition of “layer”. On the other hand, in the case of full-surface bonding with an adhesive, since an adhesive as another material is interposed, it is defined as an “adhesive layer”.

  In the present invention, an antiviral agent can be contained on the surface or inside of any layer. Moreover, an antiviral agent can also be contained in the surface of any one of several layers, or an inside. A preferred example is a form in which both outermost layers are paper layers and an antiviral agent is contained on the surface or inside of the intermediate layer.

[Providing liquid impermeability and liquid impervious layer]
In the present invention, the sanitary thin paper 10 has a liquid-impermeable layer. As a result, for example, when the nose is bitten by using the outer layer 11 of the sanitary thin paper 10 of FIG. 1 as a use surface, the runny nose W does not pass through (FIG. 3 conceptually shows a back-through prevention mode). And when the use surface is set inside and it is rolled or folded as shown in FIG. 2 and discarded, the runny nose is kept inside, so that the virus in the runny nose W can be prevented from being transmitted to others, and public health It will be clean.

  The liquid impermeability of the liquid impervious layer of the present invention is determined from the characteristics of the sanitary thin paper 10 as a whole. That is, the liquid impermeability of the liquid impermeable layer is determined by the thickness of the layers other than the liquid impermeable layer, the type of material, the number of laminated layers, and the like.

  In the present invention, it is sufficient that the sanitary thin paper 10 itself has a liquid impermeability so that the runny nose is not substantially penetrated. Specifically, the liquid impermeability based on the 10-point method is preferably 0 to 9 points, more preferably 0 to 5 points, and 0 to 2 points. Is particularly preferred. Moreover, when the liquid impermeability based on the 10-point method is 0 to 2 points, as shown in the liquid impervious layer, when the sanitary thin paper 10 is rolled after use, the liquid W containing viruses such as runny nose is obtained. This is particularly preferable because it is kept held in a wrapped state.

  Here, the 10-point method is an evaluation method for indicating the degree of liquid impermeability. In this evaluation method, first, three filter papers (“ADVANTEC 1 (150 mm)” manufactured by Toyo Roshi Kaisha, Ltd.) are stacked, a test piece is placed thereon, and a measurement plate 40 shown in FIG. The holes 41, 41... Of the plate 40 are filled with distilled water droplets, and the number absorbed by the filter paper within 2 seconds is counted and indicated as a score. The diameter of the holes 41, 41 ... is 10 mm.

  The above 10-point method is not necessarily highly accurate as a method for evaluating liquid impermeability. On the other hand, the present inventor is not limited to preventing complete run-through of the runny nose, and the amount of the run-through artificial runny nose is 10 mg or less in the run-through test of the artificial runny nose of the sanitary thin paper to be measured As long as it is known to be hygienic in actual use.

Here, the amount (mg) of the artificial runny nose to be penetrated by the run-through test of the artificial nose is a value obtained through the test process of the following (1) to (5).
(1) Artificial runny nose (saline (urea 2%, sodium chloride 0.8%, calcium chloride 0.3%, magnesium sulfate 0.8%, ion-exchanged water 96.1%): CMC (carboxyl methylcellulose) 4 % Aqueous solution = 1: 2, food red (trace amount)).
(2) Two sheets of filter paper (“ADVANTEC 1 (150 mm)” manufactured by Toyo Roshi Kaisha, Ltd.) are stacked, and the mass is measured.
(3) A test sample folded in half is laminated on the laminated filter paper.
(4) Add 1 ml of the artificial nasal drop to the filter paper with a micropipette from a height of 10 mm.
(5) After 10 seconds, the test paper is removed, the mass of the filter paper is measured, and the mass difference from before the dropping is defined as the amount of backflow (mg) of the artificial snot.

In the sanitary thin paper 10, the water absorption of the paper layer constituting the outer layer is preferably 5 seconds or more, particularly 5 to 10 seconds. Here, the water absorption (seconds) of the outer paper layer is a value obtained through the test steps (6) to (10) below.
(6) Prepare distilled water, digital micropipette, stopwatch and tripod stand.
(7) Two test papers are stacked and placed on a support with a hole having a diameter of 40 mm or more.
(8) Add 1 drop (0.1 ml) of distilled water to the test paper with a digital micropipette from a height of 10 mm.
(9) The time from when the distilled water comes into contact with the test paper to when the water is completely absorbed and the reflection on the test paper disappears is measured with a stopwatch (in units of 0.01 seconds).
(10) This test is performed five times, and the first decimal place of the average value is defined as the water absorption (seconds).

  On the other hand, in the case of three or more layers including both outermost layers, the intermediate layer can enhance the effect of preventing the breakthrough by increasing the liquid holding capacity than both outermost layers. One of the means for making the liquid holding capacity of the intermediate layer larger than the liquid holding capacity of both outermost layers is to increase the rice basis weight.

By the way, in the case of a two-layer structure, the rice basis weight of one outer layer of the liquid absorbent layer using pulp as a raw material is 10 to ²⁰ g / m ² , and the rice basis weight of the other outer layer constituting the liquid impermeable layer is 15 a is desirably ~35g / m ^2. Further, in the case of a three-layer structure, each of the outer layers of the liquid absorbent layer made of pulp is 10 to ²⁰ g / m ² , and the intermediate layer of the liquid impermeable layer is 15 to 35 g / m ^2, it is desirable in particular 15-25 g / m ^2.

  In this case, the liquid holding capacity of the intermediate layer is preferably based on the Krem water absorbency (JIS P 8141), and the Klem water absorbency is preferably 30 mm or more, particularly 30 to 50 mm. Further, the water absorption calculated from the difference in weight between before and after the measurement of the Clem water absorption is preferably 30 mg or more, particularly 30 to 50 mg.

The “paper layer” in the present invention may contain other types of cellulose, hemicellulose, hydrophilic acetate cellulose, hydrophilic non-woven fiber, etc., as long as the pulp raw material is the main component.
A liquid impervious layer is provided for such a paper layer, and the sanitary thin paper as a whole can prevent the run-through of the runny nose.
The first means for forming the liquid-impermeable layer uses a material such as a plastic film or a water-repellent nonwoven that contributes to liquid-imperviousness.
The second means for forming the liquid-impermeable layer is to use liquid fibers such as pulp fibers and acetate cellulose, and add liquid impermeability to add liquid impermeability. It is a method to do. In the present invention, it is desirable to adopt the second means.

  When the liquid-impermeable layer is formed using, for example, a film or the like as a raw material, the film may not have micropores, but from the viewpoint of pursuing the softness of sanitary thin paper, It is preferable that a hole is formed. The opening diameter of the plurality of micropores is preferably 0.1 to 40 nm, more preferably 0.5 to 30 nm, and particularly preferably 10 to 20 nm. If the opening is too small, the effect of increasing the softness of the sanitary thin paper will not be sufficient. On the other hand, if the opening is too large, the virus may pass through the impermeable layer of the present liquid. In addition, the magnitude | size of a virus is about 20-250 nm.

  The film in which the micropores are not formed can be formed from, for example, a hydrophobic thermoplastic resin. On the other hand, a film (porous film) in which micropores are formed is a film obtained by melt-kneading a hydrophobic thermoplastic resin and a fine inorganic filler made of calcium carbonate or the like or an incompatible organic polymer. And this film can be formed by uniaxial or biaxial stretching. As the above thermoplastic resin, polyolefin or the like can be used. Moreover, as this polyolefin, 1 type or several types can be suitably selected and used from high to low density polyethylene, linear low density polyethylene, a polypropylene, polybutene etc., for example.

  Hydrophobic non-woven fabrics can also be used. As this non-woven fabric, for example, a fiber made of a thermoplastic resin such as a polyolefin such as polyethylene or polypropylene, a polyester such as polyethylene terephthalate, or a polyamide, or two or more of these resins are used. A non-woven fabric formed of a composite fiber having a core-sheath type structure or a side bisite type structure can be used. Such a nonwoven fabric is preferably produced by a general production method such as an air-through method, a melt blown method, a heat seal method, a spun bond method, or a suction heat bond method. It is preferable that at least one of these is used as a raw material.

  When pulp fiber is used as a raw material, liquid impermeability can be imparted by adding a sizing agent. In this case, the sizing agent is preferably contained in an amount of 0.02 to 0.06% by solid content ratio with respect to the absolute dry mass of the pulp, and more preferably 0.03 to 0.05%. If the blending amount of the sizing agent is less than 0.02% by mass, it is impossible to sufficiently reduce the back-through of the liquid. On the other hand, when the compounding quantity of a sizing agent exceeds 0.06 mass%, the problem that water repellency becomes too strong will arise.

  As the sizing agent, for example, a neutral sizing agent such as alkyl ketene dimer, alkenyl succinic anhydride, and stearic anhydride, an acidic sizing agent such as saponified natural rosin, and reinforced rosin can be used.

  On the other hand, in the above structural example, an example in which the intermediate layer is mainly a “liquid impermeable layer” has been described. On the other hand, the outer layer can be a “liquid impermeable layer” and the intermediate layer 30 can be a “liquid absorbing layer”. Specifically, as shown in FIG. 9, a three-layer structure can be formed, the outer layers 11 and 12 can be “liquid-impermeable layers”, and the intermediate layer can be “liquid-absorbing layers”.

  In this example, a liquid such as a runny nose from one of the outer layers 11 and 12 permeates the liquid impermeable layer with the help of the discharge pressure, and moves into the “liquid absorbing layer” as the intermediate layer 30. Once it is done, the runny nose is absorbed and stays there. That is, since the other outer layer is a “liquid impermeable layer”, the runny nose absorbed in the intermediate layer 30 as the “liquid absorbing layer” is unlikely to pass through.

  More preferably, the outer layers 11 and 12 are paper layers made of pulp as raw material, ensuring flexibility and good touch, and the outer layers 11 and 12 are made of glycerin, polyhydric alcohol, saccharides, etc. Since the moisturizing chemical solution can be added as a drug imparting impermeability, the product becomes a sanitary thin paper product having a surface excellent in moisturizing property, and is less likely to pass through the runny nose.

〔Production method〕
Next, the manufacturing method of the sanitary thin paper 10 will be described by taking a case of three layers as an example.
In this manufacturing method, as shown in FIG. 13, first, the intermediate layer 30 is unwound from the reel 50. Next, an antiviral agent is externally applied to one or both surfaces of the fed intermediate layer 30 by antiviral agent application means 35 and 36 on both surfaces in the illustrated example. Then, one outer layer 11 or the other outer layer 12 is overlaid on both sides of the intermediate layer 30 coated with the antiviral agent. In the present manufacturing example, one outer layer 11 is fed out from the reel 51 and the other outer layer 12 is fed out from the reel 52 so as to overlap the intermediate layer 30. The sanitary thin paper 10 having three layers as described above can be wound up on a reel 53 and stored as appropriate.

[Used materials, drugs, etc.]
As the basis weight of the layer of the present invention, the basis weight of the outer layer 11 and 12 (JIS P 8124) is 10 to 20 g / m ² , and the basis weight of the intermediate layer having a larger liquid holding capacity (JIS P 8124). When it is set to 15 to 35 g / m ² , it is particularly preferable in that the thinness and softness are not impaired.

  Moreover, it is preferable that the moisture content of the outer layers 11 and 12 is 8-15 mass% of the pulp fiber which comprises the outer layers 11 and 12, and it is especially preferable that it is 10-13 mass%. If the moisture content is less than 8% by mass, the moist feeling is lost and the moisture in the stratum corneum may be taken away. On the other hand, if the moisture content exceeds 15% by mass, it may lead to a sticky feeling.

A preferred example of the sanitary thin paper 10 is a form having the outer layers 11 and 12 and the intermediate layer 30. An antiviral agent can be contained in the surface of the outer layers 11 and 12 or inside thereof, but the antiviral agent rarely causes rough skin for users of sensitive skin. It is desirable to externally add an antiviral agent by coating or the like. According to this form, the liquid W containing the virus that has permeated the outer layer 11 or 12 penetrates through the outer layer 11 or 12 and comes into contact with the antiviral agent on the surface 30a, so that the killing action of the antiviral agent is effectively expressed. .
The antiviral agent can also be internally added to the intermediate layer 30.

The method for externally adding the antiviral agent is not particularly limited. For example, spray coating, gravure coating, slot coating and the like can be exemplified. Further, the method for internally adding the antiviral agent is not particularly limited. For example, a method of filling in a microcapsule can be exemplified. Furthermore, the applied amount including external and internal additions of the antiviral agent can be 0.1 to 30 g / m ^{2 on the} basis of the absolute dry mass.

One of the ply bonding means according to the present invention is ply bonding. That is, line-shaped ply bonding can be performed by embossing that prevents delamination along both edges in at least one of the vertical and horizontal directions of the sheet. The ply bonding process is preferably performed at a position 5 to 40 mm away from both ends of the sheet, and more preferably at a position 10 to 20 mm away. If it is less than 5 mm, the middle layer may come into contact with the skin after the ply is peeled off. On the other hand, if it exceeds 40 mm, the end portion may turn over and the middle layer may come into contact with the skin.
Examples of the ply bonding include a process of joining by embossing (applying), a process of forming a slit, and a process of an adhesive.

  The sanitary thin paper 10 preferably has a softness of 0.5 to 3.0 g and a KES touch index of 8 to 15. If this value is satisfied, the sanitary thin paper 10 is sufficiently soft.

  Here, softness is a resistance value (average value in length and width) when a sanitary thin paper having a width of 10 cm is pushed into a gap having a width of 5.0 mm by a terminal, and means that the smaller the value is, the softer it is. In this specification, softness refers to a value measured by a handle ohmmeter method (JIS L-1096 E method). The softness can be adjusted, for example, by changing the basis weight, the number of layers, the types of fibers forming the layers, the contact processing conditions, and the like.

On the other hand, the KES touch index is a value measured by the following method.
That is, in this measurement, as shown in FIGS. 10 to 12, an artificial leather (supplera: Idemitsu Techno) is placed on the base of a friction tester “KES SE” manufactured by Kato Tech Co., Ltd. A fine terminal is placed and fixed, and the measurement terminal is covered with artificial leather (supplera: Idemitsu Techno Fine Co., Ltd.), and the measurement surface of the measurement terminal covered with artificial leather (contact plane) is olive. 4 mg of oil (BOSCO extra virgin oil: Nisshin Seimitsu) is uniformly applied, and the measurement procedure is the same as that for MMD.
Specifically, the contact plane made of artificial leather is composed of a piano wire with a cross-sectional diameter of 0.5 mm, has a unit bulging portion with a radius of curvature of the tip of 0.25 mm adjacent, and has a total width of 10 mm. An MMD measurement terminal having a continuous measurement surface and a measurement surface of approximately 10 mm square with a measurement surface length of 10 mm can be formed by covering with the artificial leather. The covering of the terminal with the artificial leather is carried out by covering the terminal with the artificial leather so that a contact plane of 10 mm square is formed or so that the artificial leather is in close contact with the measurement surface of the terminal or with a slight tension. Can be achieved. When fixing the artificial leather to the terminal, make sure that the artificial leather and the internal terminal are not displaced when measuring, that is, when the paper sample is moved, so that the artificial leather and the contact plane are not distorted. is important. For example, after covering the terminal so that the contact plane is configured, the part that does not configure the contact plane is securely fixed to a part that does not affect the measurement of the device with a rubber band or the like, such as a support material for the terminal. To do. Also, artificial leather is laid on the base of the MMD testing machine and fixed with adhesive tape or the like. At this time, it is important to firmly fix the artificial leather to the base so as not to be distorted during measurement. The artificial leather laid on the base is the same as the artificial leather constituting the contact plane. In addition, the paper sample is cut into a 10 cm square and used, and is fixed to a base on which artificial leather is laid. At the time of measurement, a sample pressing weight (about 100 g) is pressed on a paper sample. In addition, the load on the measuring terminal of the testing machine is set to 50 g, and the entire contact plane made of artificial leather is brought into contact with the paper sample with a contact pressure of 50 gf / cm ^2. This is similar to the MMD measurement. This can be achieved by attaching a disk-shaped weight to the top of the terminal. Of course, the method of fixing one end of the support material (the end opposite to the moving direction of the paper sample) conforms to the MMD measurement. The measurement is performed three times in the vertical direction of the paper sample and three times in the horizontal direction for a total of six times, and the measured value (KES feel index) is the average value of the six times.
The KES touch index can be adjusted by, for example, the type of fiber forming the outer layer, the fiber length, the fineness, the type of liquid-impermeable chemical applied to the outer layer, the amount applied, and the like.

As a means for imparting or enhancing liquid impermeability to the layer in the present invention, there is a means for using a liquid impervious chemical solution as described above. Such liquid-impermeable chemical, for example, Ru known as moisture retention chemical solution, glycerin, diglycerin, propylene glycol, 1,3-butylene glycol, polyhydric alcohols such as polyethylene glycol, sorbitol, glucose, xylitol, Examples include those using at least one humectant among saccharides such as maltose, maltitol, mannitol, trehalose, glycol solvents and derivatives thereof. Further, higher alcohols such as cetanol, stearyl alcohol and oleyl alcohol, liquid paraffin and the like can also be used. However, the liquid-impermeable chemical liquid preferably contains at least a polyhydric alcohol. This is because it has moisture retention and reduces damage to the skin during use.

  These liquid-impermeable chemicals are preferably applied in an amount of 15 to 30%, particularly preferably 20 to 25%, based on the mass of the target layer on an absolutely dry mass basis. If it is less than 15%, the effect of chemical application cannot be sufficiently obtained. On the other hand, if it exceeds 30%, the effect of chemical application is not improved, which is uneconomical.

  In addition, liquid impermeable chemicals include amino acids such as glycine, aspartic acid, arginine, alanine, cystine, cysteine; aloe extract, amateur extract, karin extract, cucumber extract, agina extract, tomato extract, Novara extract, loofah extract, lily extract Plant extracts such as olive oil, jojoba oil, rosehip oil, almond oil, eucalyptus oil, avocado oil, camellia oil, soybean oil, safflower oil, sesame oil, evening primrose oil; vitamins, hydrolysis Collagen, hydrolyzed keratin, hydrolyzed silk, chitosan, urea, honey, royal jelly, sodium hyaluronate, ceramide, squalane, petrolatum and the like can be blended.

  Furthermore, vitamin C, vitamin E, collagen, etc. can also be mix | blended with a liquid-impermeable chemical | medical solution. This kind of chemicals has a function of enhancing moisture. Vitamin C and vitamin E also function as antioxidants. Vitamin E is a component having a strong reducing power, and has an antioxidant effect that eliminates active oxygen and free radicals and prevents the generation of lipid peroxide. Therefore, vitamin E functions as a chemical solution stabilizer, and when applied to the skin of a person who uses thin paper, the effect of preventing the sebum of the skin and the effect of promoting blood circulation are exhibited. There is also a moisturizing function. Vitamin C, like vitamin E, has a sebum antioxidant effect. Furthermore, since vitamin C has an action of reducing vitamin E, when both vitamin C and vitamin E are used, vitamin C works as an auxiliary to vitamin E and reduces vitamin E oxidized by active oxygen. The effect of maintaining the strong sebum antioxidant effect of vitamin E is exhibited. Collagen forms 90% of the dermis of the skin, and when this decreases, the skin loses moisture and tension. Therefore, by making it contain in thin paper, while exhibiting the moisturizing effect which moisturizes skin when this contacts with skin, the moisturizing effect with respect to thin paper is also exhibited.

  Furthermore, if the liquid-impermeable chemical solution is weakly acidic with a pH of 5.0 to 6.0, the skin does not become alkaline even if it is brought into contact with the skin. It can effectively prevent rough skin due to the influence. A particularly preferred pH range is 5.3 to 5.7. The pH can be adjusted by adding an acidic or basic pH adjuster to the chemical solution. When the chemical solution is strongly acidic, an aqueous sodium hydroxide solution or an aqueous potassium hydroxide solution can be used. Citric acid, malic acid, and lactic acid can be used in the case of acidity and alkalinity.

  As the liquid-impermeable chemical solution, a chemical solution for obtaining a refreshing feeling, for example, sorbitol, altitol, xylitol, erythritol, lactitol, paratinite, and the like can be blended. Preferred are erythritol, xylitol and sorbitol, and more preferred are erythritol and xylitol. In addition, these chemical solutions may contain one or more cooling sensates selected from the group of menthol, salicylic acid, α-cinerol and derivatives thereof. In this case, it is desirable that a drug for obtaining a refreshing feeling is included in the outer layer in a state of being dispersed in the binder component.

  On the other hand, examples of the chemical solution that is desirably added (internally added) in the papermaking stage for layer formation include wet paper strength agents, softeners, and carboxymethylcellulose. A representative example of the softener is a surfactant-based softener. As the surfactant-based softener, an anionic surfactant, a nonionic surfactant, a cationic surfactant, and a zwitterionic surfactant can be appropriately selected and used. When an anionic surfactant is used, the stiffness (bending rigidity) can be reduced, and the moisturizing feeling by the moisturizing agent and the soft feeling by the softening agent can be promoted.

  As the anionic surfactant, carboxylate-based, sulfonate-based, sulfate ester-based, phosphate ester-based surfactants and the like can be used. However, alkyl phosphate ester salts are preferred.

  Examples of nonionic surfactants include sorbitan fatty acid esters, diethylene glycol monostearate, diethylene glycol monooleate, glyceryl monostearate, glyceryl monooleate, and polyhydric alcohol monofatty acid esters such as N- (3- Oleiroshiki-2-hydroxypropyl) diethanolamine, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitan beeswax, polyoxyethylene sorbitan sesquistearate, polyoxyethylene monooleate, polyoxyethylene monolaurate, polyoxyethylene cetyl ether Polyoxyethylene lauryl ether can be used.

  As the softening agent, it is desirable to use a cationic surfactant. This is because the cell membrane (fat) of viruses, particularly influenza viruses, is anionic and is suitable for degrading fat and killing (inactivating) the virus after the cationic surfactant is adsorbed to the cell membrane (fat). is there. As the cationic surfactant, a quaternary ammonium salt, an amine salt, an amine or the like can be used.

  In addition, as the zwitterionic surfactant, an aliphatic derivative of a secondary or tertiary amine containing carboxy, sulfonate, sulfate, an aliphatic derivative of a heterocyclic secondary or tertiary amine, or the like is used. be able to.

  As the wet strength (enhancement) agent, in addition to the melamine-formaldehyde addition condensate and the urea-formaldehyde addition condensate, the following can be suitably used in consideration of the environment. That is, polyacrylamide, polyvinyl alcohol, glyoxal / polyacrylamide copolymer, polyamide epichlorohydrin resin whose number of functional groups is reduced to 1/10 the usual number, dialdehyde starch or cation-modified starch, oxidized starch, etc., more specifically, cationic A thermosetting resin comprising a polyvinylamide copolymer having a divalent aldehyde (see, for example, Japanese Patent Publication No. 44-26670, Japanese Patent Publication No. 54-44762, and Japanese Patent Publication No. 57-149595), cationic. Aldehyde-modified polyacrylamide copolymer (see, for example, JP-A-6-184985 and JP-A-8-56868), a cationic polymer and an anionic polymer. At least one macromolecule of the molecule is hydrophobic Those having (e.g., see JP 2002-275787.) And the like, it can be used known ones.

  When this sanitary thin paper is made of tissue paper, the paper thickness in a set of three stacked sheets (3 plies) is preferably 200 to 350 μm, and more preferably 240 to 320 μm. If the paper thickness is too thin, the feeling of paper thinness felt by the user becomes remarkable, and the water-absorbing property is poor and the function as tissue paper is lowered. On the other hand, when the paper thickness is too thick, the drawer performance when a predetermined number of sheets are stored in a storage box to produce a product is deteriorated.

  Here, the paper thickness is measured under the conditions of JIS P 8111 using an Ozaki dial thickness gauge “PEACOCK G type”. Specifically, confirm that there is no dust, dust, etc. between the plunger and the measuring table, lower the plunger on the measuring table, move the memory of the dial thickness gauge to adjust the zero point, and then Then, raise the plunger and place the sample (hygienic thin paper) on the test bench, slowly lower the plunger and read the gauge at that time. At this time, only the plunger is placed. The paper thickness is an average value obtained by performing measurement 10 times.

  In the sanitary thin paper 10, the raw material of each layer is not particularly limited, and an appropriate raw material can be used according to the use such as tissue paper and toilet paper. When using pulp fiber as a raw material, as this pulp fiber (raw material pulp), for example, wood pulp, non-wood pulp, synthetic pulp, waste paper pulp, etc., more specifically, groundwood pulp (GP), Mechanical pulp such as Stone Grand Pulp (SGP), Refiner Grand Pulp (RGP), Pressurized Ground Pulp (PGW), Thermo Mechanical Pulp (TMP), Chemi Thermo Mechanical Pulp (CTMP), Bleach Chemi Thermo Mechanical Pulp (BCTMP) MP), chemical mechanical pulp (CGP), semi-chemical pulp (SCP), hardwood bleached kraft pulp (LBKP), softwood bleached kraft pulp (NBKP) and other kraft pulp (KP), soda pulp (AP), sulfite Pulp (SP), chemical pulp such as dissolving pulp (DP) (C ), Synthetic pulp made from nylon, rayon, polyester, polyvinyl alcohol (PVA), etc., deinked pulp (DIP), waste paper pulp such as waist pulp (WP), ground pulp (TP), cotton, flax, hemp, Select one or several types from rag pulp, straw pulp, esparto pulp, bagasse pulp, bamboo pulp, kenaf pulp and other auxiliary pulps such as bast pulp, etc. Can be used.

  Raw materials such as pulp fibers are formed into a single layer by, for example, a known papermaking process, specifically, a wire part, a press part, a dryer part, a size press, a calendar part, and the like. In this papermaking, for example, suitable chemicals such as a dispersant, caustic soda, aqueous ammonia and other pH adjusters, antifoaming agents, preservatives, fluorescent dyes, mold release agents, water resistance agents, flow modifiers, yield improvers, etc. Can be added.

  In the sanitary thin paper 10, the type of antiviral agent that can be used is not particularly limited. For example, monoterpene hydrocarbons contained in plant extract components such as oximen, camphene, limonene, sabinene, myrcene, terpinene, pinene, and cymene, monoterpene alcohols such as citronellol, geraniol, isopulegol, linalool, terpineol, and anethole , Carvacrol, eugenol, thymol, paracresol, kabicol, rose butts extract, phenols such as green tea polyphenol, phenol ethers such as t-anethole, chabicol methyl ether, safrole, acetaldehyde, citral, citronellal, geranial, perylaldehyde Aldehydes such as palarenar, acetophenone, camphor, jasmon, note caton, menthone, fengcon, carvone, plegon 1 type of medicinal ingredients such as olefins, potassium olefin oxide, cineol, bisabolol oxide, catechin, proanthocyanidins, flavones, flavanones, anthocyanins, phenols, flavonoids such as flavonols, etc. Alternatively, several types can be appropriately selected and used. In addition, for example, organic acids such as ascorbic acid, carboxylic acid, citric acid and alkylbenzene sulfonic acids such as dodecylbenzene sulfonic acid, sodium dodecyl benzene sulfonate, calcium dodecyl benzene sulfonate and salts thereof, anionic surfactants, cationic surfactants Agents, amphoteric surfactants, nonionic surfactants and the like can also be used. However, it is preferable to use at least one of a surfactant and a polyhydric alcohol as the antiviral agent. This is to inactivate the virus by adsorbing and decomposing to the virus cell membrane.

These antiviral agents are preferably applied in an amount of 0.1 to 30 g / m ^2, preferably 1 to 10 g / m ² , with respect to the intermediate layer having a large liquid holding capacity on the basis of the absolute dry mass. Is particularly preferred. If it is less than 0.1 g / m ² , the effect of applying an antiviral agent cannot be sufficiently obtained. On the other hand, even if it exceeds 30 g / m ² , the effect of applying the antiviral agent is not sufficiently improved, which is uneconomical.

  Moreover, when using an antiviral agent as mentioned above, it is preferable to make the inactivation rate with respect to the virus which has a cell membrane be 99% or more. Moreover, the reason why the target virus is limited to those having a cell membrane is that the surfactant is adsorbed on the cell membrane and decomposes to suppress the propagation of the virus.

As a method for measuring the inactivation rate, influenza virus (A / Panama / 2007/99 (H3N2) strain) is adjusted to about 10 ⁵ FFU / ml with a minimum essential medium to obtain a virus solution. A thin paper impregnated with an antiviral agent is used as a middle layer, and a three-layer structure is used as a set of test papers. This test paper cut into 1.5 cm × 1.5 cm is used as 3 samples in 1 set (9 sheets including 3 middle layers impregnated with an antiviral agent) and immersed in 0.5 ml of virus solution. Leave at room temperature (25 ° C) for 1, 5, 15, and 60 minutes. The reaction solution after being allowed to stand is diluted 1: 1 to 4 times, and the virus infectivity (quantitative value indicating the infectivity of the virus) in the solution is measured by a microinfectivity assay, and the virus is killed after 60 minutes ( The ratio (%) of inactivation is taken as the measured value.

About the Example goods which concern on this invention, and the commercially available general purpose tissue paper, and the commercially available tissue paper which moistened the moisture, various characteristics, such as an artificial nasal drainage, were investigated, and the results shown in Table 1 and Table 2 were obtained. was gotten. Here, the “absorbing layer” in each table means “intermediate layer” in the case of a three-layer structure, and means “one layer” in the case of a two-layer structure. The measured values of water absorption are shown in the corresponding columns.
It was found that the example products according to the present invention have a very high effect of reducing the run-through of the runny nose. Although not shown in the table, all of the examples have softness values of 0.5 to 3.0 g and KES feel index values of 8 to 15, and are almost the same as the commercial products. The touch was shown.

The conditions of the artificial runny nose penetration test under load conditions (3 seconds at 250 g load) are as follows with reference to FIG.
(11) Artificial runny nose (saline (urea 2%, sodium chloride 0.8%, calcium chloride 0.3%, magnesium sulfate 0.8%, ion-exchanged water 96.1%): CMC (carboxyl methylcellulose) 4 % Aqueous solution = 1: 2, food red (trace amount)).
(12) Two sheets of filter paper (“ADVANTEC 1 (150 mm)” manufactured by Toyo Roshi Kaisha, Ltd.) are laminated and the mass is measured. Make a valley crease in the center of this filter paper.
(13) A test sample is laminated on the laminated filter paper ((a) figure).
(14) 1 ml of the artificial nasal drop is dropped onto the filter paper with a micropipette from a height of 10 mm ((b) diagram).
(15) Fold the test sample in half along the fold along with the filter paper ((c) figure).
(16) On top of that, water is put into a 500 ml capacity SUS beaker (manufactured by Tokyo Glass Co., Ltd.) and the total weight is 250 g. At this time, the beaker is placed so that the center of the bottom surface (diameter 82 mm, bottom area 52.8 cm 2) is directly above the center of the dropped artificial nasal mucus. After 3 seconds, the beaker is removed, the test sample is removed, the mass of the filter paper alone is measured, and the mass difference from before dropping is defined as the amount of artificial nasal runthrough (mg) under load conditions (3 seconds at 250 g load). .

It is a cross-sectional schematic diagram of a sanitary thin paper. It is a summary explanatory drawing at the time of disposal of sanitary thin paper. It is a cross-sectional schematic diagram of a sanitary thin paper. It is a cross-sectional schematic diagram of a sanitary thin paper. It is a cross-sectional schematic diagram of a sanitary thin paper. It is a cross-sectional schematic diagram of a sanitary thin paper. It is a cross-sectional schematic diagram of a sanitary thin paper. It is a perspective view of a measurement board. It is a cross-sectional schematic diagram of another sanitary thin paper. It is a figure for demonstrating the measuring method of a KES touch index. It is a figure for demonstrating the measuring method of a KES touch index. It is a figure for demonstrating the measuring method of a KES touch index. It is a figure which shows the manufacture flow of sanitary thin paper. It is explanatory drawing of the conditions of the run-through test of the artificial runny nose under load conditions (3 seconds at a load of 250 g).

  10 ... sanitary thin paper, 11, 12 ... outer layer, 30 ... middle layer, W ... runny nose.

Claims (6)

3 layers of hygienic tissue paper,
Each layer is a paper layer made from pulp,
The water absorption of the both outer layers is 5 seconds or more, basis weight is ^{10~20g / m 2 (JIS P 8124} ),
The intermediate layer has a Krem water absorption of 30 mm or more (JIS P 8141), a rice tsubo of 15 to 35 g / m ² (JIS P 8124),
In both the outer layers, a liquid-impermeable chemical solution is contained in an amount of 15 to 30% with respect to the pulp dry mass of each outermost layer,
Liquid holding capacity of the intermediate layer is larger than the liquid retention capacity of the both outer layers,
A sanitary thin paper characterized in that the amount of artificial nasal runthrough in an artificial nasal runthrough test (no load) is 10 mg or less. The sanitary thin paper according to claim 1, wherein the amount of the artificial nasal discharge in the artificial nasal discharge test under a load condition (3 seconds at 250 g load) is 150 mg or less. The sanitary thin paper according to claim 1 or 2, wherein the moisture content of the two outer layers is 8 to 15% with respect to the pulp dry mass of each outermost layer. Each layer which mutually overlaps is overlap | superposed by any one joining process chosen from the group of thermal fusion, ultrasonic fusion, an adhesive, and ply bonding. Sanitary tissue paper. The sanitary thin paper according to any one of claims 1 to 4, wherein the intermediate layer is colored, and the coloration is visible from at least one outer layer side. 10-55 g / m product weight ² The sanitary thin paper according to any one of claims 1 to 5.

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