JP2013227707A - Tissue paper having chemical solution imparted thereto and method for producing tissue paper having chemical solution imparted thereto - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the effect of tissue paper having a moisturizing agent applied thereon, under a low-humidity environment.SOLUTION: Tissue paper 100 having a chemical solution imparted thereto contains: 0.1-3 wt. % of a high water-absorbing resin 10; 0.1-5 wt. % of sodium chloride; and 8-24 wt. % of polyol 20.

Description

  The present invention relates to tissue paper, and particularly to tissue paper to which a chemical solution is applied.

  The tissue paper includes a chemical-solution-added type to which a chemical solution that imparts moisture retention and flexibility is applied, and is superior to a general-purpose product in moist feeling and softness.

  There are various chemicals that impart moisture retention and flexibility to tissue paper, but aqueous chemicals mainly composed of water and polyol (also referred to as “aqueous lotion” or “lotion chemical”) are often used. Aqueous chemicals are excellent in affinity with the pulp fibers constituting the sheet when applied to the sheet, impregnated in the thickness direction of the sheet (also referred to as Z direction), and the hygroscopic property of the main component polyol is the sheet. Gives moist feeling and softness.

  However, tissue paper using conventional aqueous chemicals does not have a sufficient moisture absorption function for polyols in a low-humidity environment, or releases the incorporated water, making it difficult to feel moist and soft. There was a problem of becoming. Although the moisture absorption effect can be increased by increasing the amount of polyol in the aqueous chemical solution, this makes the tissue paper sticky due to the polyol, and excessive moisture absorption in a high humidity environment causes the tissue paper to be stored. This causes a problem that moisture is absorbed before the paper storage box is affected.

JP 2004-320204 A Special table 2008-525103

  Therefore, a main problem of the present invention is to solve the above-described problem, and to provide a tissue paper to which a chemical solution is applied so that a high moisture content can be maintained even in a low humidity environment and there is no stickiness. It is in.

The present invention that has solved the above problems is as follows.
[Invention of Claim 1]
A tissue paper provided with a chemical solution, comprising 0.1 to 3% by weight of a superabsorbent resin, 0.1 to 5% by weight of sodium chloride, and 8 to 24% by weight of a polyol.

[Invention of Claim 2]
The tissue paper provided with the chemical solution according to claim 1, which is a two-ply and has a superabsorbent resin supported on its inner surface.

[Invention of Claim 3]
Sodium chloride is added to a water-based moisturizing liquid containing 10 to 20% by weight of water and 70 to 90% by weight of polyol so that the concentration is 5 to 15% by weight. .1-5% by weight added to produce a moisturizing liquid containing a superabsorbent resin,
The manufacturing method of the tissue paper provided with the chemical | medical solution characterized by providing 10-30 weight% of chemical | medical solutions containing this super absorbent resin with respect to tissue paper.

[Invention of Claim 4]
The method for producing tissue paper provided with the chemical solution according to claim 3, wherein the moisturizing chemical solution is applied to a sheet constituting the tissue paper, and then the application surface is laminated to become a laminated inner surface.

(Function and effect)
The tissue paper to which the chemical solution according to the present invention is applied contains a polyol, a superabsorbent resin also referred to as SAP or a superabsorbent polymer, and sodium chloride.
Since the tissue paper according to the present invention contains a polyol, moisture is taken into the fiber layer of the tissue paper due to its hygroscopicity and water retention, and it becomes moist and flexible.

  In addition, since the tissue paper according to the present invention contains a highly water-absorbing resin together with its polyol, a part of the water taken into the fiber layer due to the hygroscopic property of the polyol is taken into the highly water-absorbing resin, resulting in a highly water-absorbing resin. The resin gels and retains moisture. The water retention of the superabsorbent resin is relatively strong, and the moisture does not easily disperse in an environment where tissue paper is normally used. Therefore, the tissue paper according to the present invention is extremely moist, soft and thick, and does not lose its moisture even in a low humidity environment.

  Furthermore, the tissue paper according to the present invention contains sodium chloride together with a polyol and a superabsorbent resin. Although sodium chloride is weak, it has a hygroscopic property and gives a moist feeling to the fiber layer. In addition, since the water taken in by the action of polyol or the like due to the presence of sodium chloride becomes a sodium chloride aqueous solution, the gelation of the superabsorbent resin is adjusted by the osmotic pressure with the sodium chloride aqueous solution, and the swelling becomes insufficient. Or excessive swelling.

  In particular, in the tissue paper according to the present invention, the tissue paper has a polyol content of 8 to 24% by weight, sodium chloride of 0.1 to 5% by weight, and a superabsorbent resin of 0.1 to 3% by weight. Under normal usage conditions, the gelation of the superabsorbent resin is coupled with reversibility, and the osmotic pressure between the superabsorbent resin and the sodium chloride aqueous solution provides a suitable water balance between the fiber layer and the superabsorbent resin. The moisture content of the paper is maintained at 15 to 25%. This is 10-15% or more of the conventional moisturizing tissue paper. Further, the moisture content does not decrease in a low humidity environment as in the conventional moisture-retaining tissue paper within the above moisture content range.

  On the other hand, in producing the tissue paper according to the present invention, first, 5 to 15% by weight of sodium chloride is added to an aqueous moisturizing liquid containing 10 to 20% by weight of water and 70 to 90% by weight of polyol, and then Add 0.1-5 wt% of superabsorbent resin powder.

  Since the superabsorbent resin is added after the addition of sodium chloride, the superabsorbent resin is prevented from unintentionally swelling during production. Further, when the addition amount of sodium chloride is outside the above range, appropriate gelation of the superabsorbent resin can be obtained, and swelling during production can be effectively suppressed. On the other hand, by applying 10 to 30% by weight of the moisturizing chemical solution to the tissue paper, it becomes possible to make the tissue paper contain a suitable and effective amount without swelling the highly water-absorbent resin. Here, the coating amount is the coating amount of the entire tissue paper.

  As described above, according to the present invention, a chemical-coated tissue paper that can maintain a high moisture content even in a low humidity environment is provided.

It is sectional drawing of the two-ply tissue paper based on this invention. It is sectional drawing for demonstrating the aspect at the time of the water | moisture content intake of the tissue paper which concerns on this invention. It is sectional drawing for demonstrating the aspect after taking in the water | moisture content of the tissue paper which concerns on this invention.

Hereinafter, an embodiment of tissue paper (hereinafter also simply referred to as tissue paper) to which a chemical solution according to the present invention is applied and a manufacturing method thereof will be described in detail with reference to the drawings.
The tissue paper according to the present invention is a tissue paper coated with a moisturizing chemical solution containing a polyol, and further contains a superabsorbent resin and sodium chloride.

The tissue paper according to the present invention preferably has a 2-ply or 3-ply ply structure. Further, the basis weight and paper thickness of the tissue paper according to the present invention are not particularly limited, but the basis weight according to JIS P 8124 is 10 to 20 g / m ² per ply, the paper thickness (measured with Peacock manufactured by Ozaki Mfg. Co., Ltd.). ) Is preferably 100 to 200 μm. When the basis weight and the paper thickness are out of the above ranges, it is not preferable in terms of strength and softness as tissue paper.

  The base paper constituting the tissue paper ply according to the present invention was made from a papermaking raw material in which a known chemical agent such as a dry paper strength agent or a wet strength agent was added to a pulp slurry in a papermaking facility having a Yanki dryer. Crepe paper can be used.

  The pulp raw materials in the tissue paper according to the present invention are preferably NBKP (conifer kraft pulp) and LBKP (hardwood kraft pulp). Although the waste paper pulp may be blended as appropriate, the texture of the resulting tissue paper is excellent, and therefore, it is preferably composed only of NBKP and LBKP of virgin pulp. In this case, the blending ratio (JIS P 8120) is preferably NBKP: LBKP = 20: 80 to 80:20, and particularly preferably NBKP: LBKP = 30: 70 to 60:40.

  On the other hand, the polyol contained in the tissue paper according to the present invention is also a main component of the moisturizing chemical solution, specifically, glycerin, diglycerin, propylene glycol, 1,3-butylene glycol, polyethylene glycol, and derivatives thereof. And saccharides such as polyhydric alcohols such as sorbitol, glucose, xylitol, maltose, maltitol, mannitol and trehalose. Of these, glycerin is effective.

The content of the polyol in the tissue paper according to the present invention is desirably 1.5 to 5.5 g / m ² when absolutely dry, and the content is desirably 8 to 24% by weight. Within this range, the moisture absorption action by the polyol is sufficiently effectively exhibited, and a moist and soft feeling can be obtained.

  On the other hand, the tissue paper according to the present invention contains a superabsorbent resin together with a polyol. The superabsorbent resin is also called SAP or superabsorbent polymer, has a three-dimensional network structure in which a water-soluble polymer is cross-linked, and absorbs and retains several hundred to thousand times of water. Is. This superabsorbent resin is composed of polyacrylate, polysulfonate, maleate, polyacrylamide, polyvinyl alcohol, polyethylene oxide and other synthetic polymer compounds, polyasparagine hydrochloride, polyglutamate. Examples thereof include compounds derived from natural products such as those based on natural alginate, polyalginate, starch and cellulose, or mixtures of two or more of these. Commercial products can also be used. A cross-linked polyacrylate having excellent water absorption and cost is desirable.

The content of the superabsorbent resin in the tissue paper according to the present invention is preferably 0.01 to 1 g / m ² when absolutely dry, and the content is preferably 0.1 to 3% by weight. Within this range, the water retention function by the superabsorbent resin is sufficiently exhibited. In addition, when there is too much content of super absorbent polymer, it will not function as tissue paper by excessive gelation.

On the other hand, the tissue paper according to the present invention contains sodium chloride together with the polyol and the superabsorbent resin. The content of sodium chloride in the tissue paper according to the present invention is preferably 0.05 to 1 g / m ² when absolutely dry, and the content is preferably 0.1 to 5% by weight. Within this range, gelation by the superabsorbent resin is adjusted to a suitable range.

  Specifically, the moisture content of the tissue paper is maintained at 15 to 25% by weight under a normal tissue paper usage environment at a humidity of 20 to 70% and a temperature of 0 to 30 ° C.

  On the other hand, the tissue paper according to the present invention may contain an appropriate functional drug in addition to the polyol, the superabsorbent resin, and sodium chloride. Examples of this functional agent include surfactants, inorganic and organic fine particle powders, and oily components. The surfactant has the effect of giving the tissue paper more flexibility and smoothing the surface. As the surfactant, an anionic surfactant, a cationic surfactant, and a zwitterionic surfactant can be used. Inorganic and organic fine particle powders have a smooth surface. The oil component has a function of improving lubricity, and a high-absorbing alcohol such as liquid paraffin, cetanol, stearyl alcohol, oleyl alcohol and the like can be used.

  On the other hand, in the tissue paper according to the present invention, the position where the superabsorbent resin is supported is not particularly limited. However, as shown in FIG. 1 as an example 100 of a two-ply tissue paper, When the three-ply mode is adopted, the inner surface is preferably a laminated inner surface (in the figure, each ply is indicated by a symbol P). The laminated inner surface (the surface where the plies P, P face each other) easily collects moisture due to moisture absorption and is difficult to evaporate, so that moisture is easily taken into the highly water-absorbent resin 10. Moreover, when it is a laminated | stacked inner surface, the super absorbent polymer 10 does not touch skin directly at the time of use, such as when a nose is bitten with tissue paper. That is, even if it touches an excessive runny nose and the superabsorbent resin 10 becomes a gelled and swollen state, the gelated superabsorbent resin does not stick to the skin and become sticky.

  In the tissue paper 100 according to the present invention, as shown in FIG. 1, when the polyol 20 that has penetrated the entire fiber layer 1 absorbs moisture 30, 30,... In the atmosphere, moisture is taken into the fiber layer 1, and FIG. As shown in FIG. 2, the moisture is taken in and held in the superabsorbent resin 10 and the superabsorbent resin swells. And as shown in FIG. 3, while the water | moisture content taken in by the superabsorbent resin 10 was adjusted with the osmotic pressure by presence of sodium chloride, the water | moisture content 30 in the atmosphere was absorbed, and the water | moisture content 30 was diffused in the atmosphere. Thus, the moisture content of the tissue paper as a whole is maintained at 15% by weight or more (moisture movement in FIGS. 1 and 3 is schematically indicated by a dotted line).

Next, a method for manufacturing tissue paper according to the present invention will also be described.
The method for producing tissue paper according to the present invention is characterized in that a moisturizing chemical solution containing a polyol, sodium chloride and a superabsorbent resin is prepared and applied to the tissue paper. That is, it is not necessary to separately apply the moisturizing chemical and the superabsorbent resin to the tissue paper.

  The manufacturing method first prepares an aqueous humectant solution containing 10 to 20% by weight of water and 70 to 90% by weight of polyol. An appropriate functional drug may be contained. Next, sodium chloride is added to the moisturizing liquid so as to be 5 to 15% by weight.

  Once sodium chloride is added to a predetermined concentration, 0.1 to 5% by weight of a superabsorbent resin powder is then added to prepare a moisturizing liquid containing the superabsorbent resin. Prior to sodium chloride, if a superabsorbent resin is added, or if the sodium chloride concentration is less than 5% by weight, the superabsorbent resin absorbs the water in the aqueous chemical solution and swells, making application difficult. Moreover, when the density | concentration of sodium chloride exceeds 15 weight%, there exists a possibility that a water | moisture retention may not function effectively by a highly water absorbent resin.

  Next, 10 to 30% by weight of the moisturizing liquid containing the superabsorbent resin is applied to the tissue paper. In addition, this provision amount is the provision amount as the whole tissue paper. In the case of a ply structure, an appropriate amount can be applied according to the number of plies. For example, in the case of two-ply tissue paper, 5 to 15% by weight may be applied to each ply, or no moisturizing chemical is applied to one ply and 10 to 30% by weight is applied to the other ply. Can be granted.

  As a method for applying the chemical solution, a known coating means can be appropriately selected and used. It is preferable to use a printing method such as gravure coating or flexographic coating in which a chemical solution is uniformly applied to the entire coating surface. In this case, the temperature at the time of chemical solution application is preferably 20 ° C to 60 ° C, more preferably 30 ° C to 50 ° C. Further, it is desirable that the viscosity be 700 mPa · s or less (more preferably 400 mPa · s or less).

  If coating is applied to each ply, a printing machine is installed on a ply machine (lamination machine) that stacks and winds continuous sheets fed from a plurality of original fabric rolls, and is laminated from the original fabric rolls. It is desirable to apply a chemical solution to each continuous sheet constituting the previous ply. In that case, if a chemical solution is applied to the inner surface of the laminated layer, the liquid portion in the chemical solution penetrates in the Z direction of the paper, but the superabsorbent resin remains in the shape of the paper surface. The resin may be supported.

  On the other hand, in the tissue paper according to the present invention, for example, a bundle of a plurality of tissue papers is stored in a rectangular parallelepiped storage box, and provided on the upper surface of the storage box (also referred to as a carton box or tissue carton). The tissue paper product that is used by sequentially pulling out the tissue paper one by one from the taken-out outlet (a type in which when the sheet is taken out, the next sheet is continuously drawn out from the outlet is called a pop-up type).

  Such tissue paper products can be manufactured with known manufacturing equipment for this type of product. For example, a rotary interfolder or a multi-stand interfolder can be used for manufacturing a bundle.

Examples and Comparative Examples according to the present invention were prepared, and dry tensile strength, wet tensile strength, softness, and moisture content were measured. The physical properties / compositions and measured values of each example are shown in Table 1 below.
In addition, each example is 2 plies, and the rice basis weight in the table is the basis weight of 1 ply after the chemical solution is applied. The ratio (% by weight) of the moisturizing liquid is a ratio with respect to the rice tsubo.
The examples containing the moisturizing chemicals were manufactured based on the method according to claim 3, and Comparative Examples 3 and 4 were manufactured so that only the mixing ratio of sodium chloride was different.
The dry tensile strength and wet tensile strength are values measured in accordance with JIS P 8113 and JIS P 8135, with the sample size set to 25 × 150 mm and the load cell gripping interval set to 100 mm.
The softness is a value obtained by measuring the sample size as 100 × 100 mm in accordance with the JIS L 1096E method and calculating the average value in the vertical and horizontal directions.
The moisture content is determined by measuring the mass of a sample stored for 2 hours or more in a constant temperature and humidity chamber at 23 ° C. and 50% and a sample obtained by drying the sample for 4 hours under the condition of 105 ° C. ± 3 ° C. From the above, the moisture content was obtained by arithmetic.

As understood from Table 1, Examples 1 to 6 of the present invention have a higher moisture content than Comparative Examples 1 and 2 in which only the superabsorbent resin and the moisturizing chemical solution not containing sodium chloride were applied. It is recognized that Further, in Comparative Examples 3 and 4 in which a higher water-absorbing resin was contained but the amount of sodium chloride was less than that of the present invention, the chemical solution was solidified and the highly water-absorbing resin (described as SAP in the table) was detached. The use as tissue paper became problematic.
From the above results, the moisture content can be increased by using the superabsorbent resin and sodium chloride in the present invention, and the conventional moisturizing type provided only with the conventional moisturizing chemical solution in combination with the moisturizing chemical solution. A moisture content higher than that of tissue paper can be achieved.
Moreover, since it can be confirmed that the moisture content improvement effect is due to the highly water-absorbing resin, it can be said that the water retention by the highly water-absorbing resin is sufficiently exhibited.

  DESCRIPTION OF SYMBOLS 100 ... Tissue paper, P ... Ply, A ... Front and back of tissue paper (laminated inner surface of ply), 1 ... Fiber layer, 10 ... Super absorbent polymer, 20 ... Polyol, 30 ... Moisture.

Claims (4)

  A tissue paper provided with a chemical solution, comprising 0.1 to 3% by weight of a superabsorbent resin, 0.1 to 5% by weight of sodium chloride, and 8 to 24% by weight of a polyol.   The tissue paper provided with the chemical solution according to claim 1, which is a two-ply and has a superabsorbent resin supported on its inner surface. Sodium chloride is added to a water-based moisturizing liquid containing 10 to 20% by weight of water and 70 to 90% by weight of polyol so that the concentration is 5 to 15% by weight. .1-5% by weight added to produce a moisturizing liquid containing a superabsorbent resin,
The manufacturing method of the tissue paper provided with the chemical | medical solution characterized by providing 10-30 weight% of chemical | medical solutions containing this super absorbent resin with respect to tissue paper.   The method for producing tissue paper provided with the chemical solution according to claim 3, wherein the moisturizing chemical solution is applied to a sheet constituting the tissue paper, and then the application surface is laminated to become a laminated inner surface.