JP7123321B2 - tissue paper - Google Patents

Description

The present invention relates to tissue paper.

Tissue paper includes moisturizing tissue in which a moisturizing agent containing polyol is applied to base paper, and non-moisturizing tissue in which a moisturizing agent is not applied to base paper. The non-moisturizing tissue does not increase the moisture content due to the moisture absorption of the polyol, and has the advantage of having a firm and thick feeling, and a dry feeling with less stickiness, so that the moisturizing agent does not transfer to the skin.

In addition, non-moisturizing tissue has two plies with a basis weight of about 12 g/m ² per ply, and is a general-purpose type that is valued for its price. Similar to moisturizing tissue, some belong to a group of products considered high-end.

Conventionally, the latter non-moisturizing tissue paper has a high basis weight and is thick, but in order to express the softness and smoothness of a luxury product, the density of the paper has been lowered, and especially the cushioning property in the thickness direction has been developed. It's been broken

JP 2017-113223

However, if the density of the paper is reduced, the cushioning properties in the thickness direction will increase, but the fibers on the surface will be sparse and the texture will increase, so it is difficult to further improve the softness and smoothness simply by reducing the density of the paper. . On the other hand, if the density of the paper is excessively lowered, the strength tends to be insufficient and the feeling of firmness tends to decrease. Furthermore, when a large amount of bulking agent is used to lower the density of paper, problems such as deterioration of releasability from the dryer during papermaking tend to occur.

On the other hand, if it has a high moisture content like a moisturizing tissue, softness is likely to be expressed, but the advantage of being excellent in softness while having a dry feeling peculiar to non-moisturizing tissue is diminished. It also reduces the feeling of firmness.

Accordingly, the main object of the present invention is to provide a non-moisturizing tissue paper with a high basis weight that is superior in softness and smoothness and also has firmness.

The first means for solving the above problems is
3-ply tissue paper,
The basis weight per ply is 12.0 g/m ² or more,
The thickness of the 3-ply paper is 200 to 265 μm,
Moisture content is 4.0 to 9.0% by mass,
Contains 0.15 to 0.45% by mass of an oily component extracted with diethyl ether,
The tissue paper has a transverse bending rigidity of less than 0.006 gf·cm/cm and a transverse bending recovery force of less than 0.005 gf·cm/cm.

The second means is
The dry tensile strength in the machine direction is 300 to 440 cN,
a transverse dry tensile strength of 130 to 200 cN;
It is a tissue paper according to the first means.

A third way is
The tissue paper according to the first means is not externally coated with polyol.

A fourth means is
The tissue paper according to the first means, which does not contain glycerin.

According to the present invention described above, there is provided a non-moisturizing tissue paper with a high basis weight that is superior in softness and smoothness and has firmness.

It is a graph which shows the result of the sensory evaluation of the Example which concerns on this invention, a comparative example, and a conventional example.

Embodiments of the present invention will be described below.

The number of plies of the tissue paper according to the present invention is 3, and the basis weight per ply is 12.0 g/m ² or more. Preferably, the basis weight per ply is 13.0 g/m ² or more. The basis weight of the non-moisturizing high-grade product type is 14.0 g/m ² or more per ply for two-ply products, especially the basis weight range is 14.0 to 17.0 g/m ² . Many are in the range of This is because if it is less than 14.0 g/m ² , it is difficult to express the feeling of thickness and bulkiness, and it is difficult to feel the difference from low-priced general-purpose products. In this embodiment, by increasing the number of plies to 3 plies, the basis weight is lower than 14.0 g/m ² , and if it is 2 plies, it falls within the range of general-purpose products from 12.0 g/m ² . As for the range, a feeling of thickness can be obtained, and a space between the two plies is formed to enhance the cushioning property, and a feeling of luxury can be sufficiently obtained compared to low-priced general-purpose products. Here, the upper limit of the grammage of one ply is not necessarily limited because the higher the grammage, the better the feeling of thickness. In the case of the 3-ply tissue paper according to this embodiment, it is preferably 14.6 g/m ² or less, more preferably 14.0 g/m ² or less. In this embodiment, by using 3 plies, unlike the case of 2 plies, a feeling of thickness and cushioning properties can be obtained even if the basis weight is in a slightly lower range. In addition, the 3-ply construction enhances the feeling of firmness. The paper thickness is 200-265 μm for 3 plies. In the range of basis weight described above, the density becomes moderately low, and together with the gaps between the plies, it becomes easy to feel the cushioning properties.

Here, the basis weight in the present invention means a value measured based on JIS P 8124 (1998), and the paper thickness is measured after the test piece is sufficiently conditioned under the conditions of JIS P 8111 (1998). , means a value measured under the same conditions using a dial thickness gauge (thickness measuring instrument) "PEACOCK G type" (manufactured by Ozaki Seisakusho). The specific procedure for this paper thickness measurement is to confirm that there is no dust or dust between the plunger and the measuring table, lower the plunger on the measuring table, and move the memory of the dial thickness gauge to zero. Align the points, then lift the plunger to place the sample on the test bench and slowly lower the plunger to read the current gauge. At this time, only the plunger is placed. The terminal of the plunger is made of metal, and a circular flat surface with a diameter of 10 mm is placed perpendicularly to the plane of the paper. Let the average value obtained by performing the measurement 10 times.

On the other hand, the tissue paper according to the present invention has a moisture content of 4.0 to 9.0% by mass. Preferably, it is 4.0 to 8.0% by mass. Moisture content is measured as follows. Two sets of samples are taken from the object to be measured, and the humidity is adjusted in a constant temperature and humidity room at 23° C. and 50% for 3 hours. Each sample is placed in a weighing bottle, sealed, and weighed. Next, with the lid of the weighing bottle opened, it is placed in a dryer adjusted to 105±3° C. and dried for 4 hours. After the weighing bottle is covered in the dryer, it is taken out from the dryer, the temperature is naturally lowered to room temperature, and after 15 to 20 minutes, the weight of the weighing bottle containing the sample is measured. Next, moisture content (% by mass) = (((weighing bottle + mass of sample before drying) - (weighing bottle + mass of sample after drying)) / ((weighing bottle + weight of paper before drying) - (weight of weighing bottle))))×100 to calculate the moisture content. Here, when the difference in moisture content (% by mass) of two samples is within 1.0% by mass, the average value is adopted as the moisture content (% by mass) of the sample. Moisture content is expressed in % with one decimal place. On the other hand, if the difference in moisture content between the two sets of samples exceeds 1.0% by mass, the test is retested.

The tissue paper according to the present invention has a moisture content in the range of 4.0 to 9.0% by mass. When the moisture content is within this range, the product has a dry feel and a thick, luxurious feel. Here, in order to achieve a moisture content of 4.0 to 9.0% by mass, it is desirable to use a non-moisturizing tissue that does not externally apply a moisturizing agent to the base paper. Moisturizing tissue generally has a moisture content of more than 10.0% by mass. If a non-moisturizing tissue is used in which no moisturizing agent is externally applied to the base paper, the above moisture content is easily achieved. Moisturizing agents include polyols such as glycerin, 1,3-butylene glycol, propylene glycol, 3-methyl-1,3-butanediol, 1,3-propanediol, and 2-methyl-1,3-propanediol. It is an external additive liquid that increases the moisture content due to its hygroscopicity.

Furthermore, it is desirable that the tissue paper according to the present invention does not contain glycerin. Glycerin is desirably not included as an internal additive. Glycerin increases the moisture content due to its high hygroscopicity, but the presence of glycerin tends to cause stickiness. Furthermore, it is desirable that the tissue paper according to the present invention does not contain trihydric or higher polyhydric alcohols. Although these are oily components, they tend to give a sticky feeling.

The tissue paper according to the present invention characteristically contains 0.15 to 0.45% by mass of an oily component that is extracted with diethyl ether. It preferably contains 0.21 to 0.35% by mass. More preferably, it contains 0.23 to 0.30% by mass. Diethyl ether effectively extracts oils and fats, which are low-polar substances. Pulp, which is the main raw material of tissue paper, does not contain an oily component. Therefore, the oily component according to the present invention is contained due to the internal additive, particularly the internal softening agent. Some tissue paper containing an oily component is coated with an oil component such as silicone or polysiloxane by external addition. It is difficult to express the effect by application. The inventors have found that the range of 0.15 to 0.45% by mass of the oily component is not suitable for conventional non-moisturizing tissues, regardless of whether it is a general-purpose type with a low basis weight or a high-grade type with a high basis weight. It is known that it is a high content that cannot be seen. If it is less than 0.15% by mass, the effect of improving softness and smoothness is small, and if it exceeds 0.45% by mass, the cost is high and production becomes difficult.

The tissue paper according to the present invention contains many oily components extracted by diethyl ether resulting from the internal additive. In other words, the surface of the pulp fibers is coated with a large amount of oily components, and the surface smoothness of the film of the oily components and the action of weakening the hydrogen bonds between the pulps act strongly, resulting in a high degree of softness. Furthermore, since there are many oily components covering the surface of the pulp fiber, the moisture content of the pulp is retained by an emollient effect. In other words, although the oil component itself does not have a moisture absorption effect, the pulp fiber itself does not interfere with the effect of retaining the absorbed moisture, and the moist feeling is not excessively lowered.

Here, in order to increase the content of oily components, it is possible to increase the amount of softening agents containing fats and oils or to increase the amount of fats and oils in the softening agents. Since it is a substance, it is generally difficult to increase the fixation rate to fibers simply by increasing the amount of the softener added. In addition, the adhesion rate to the dryer may decrease, resulting in deterioration of operability. For this reason, in order to increase the fixation rate of fats and oils extracted with diethyl ether to the fibers, it is preferable to increase the contact opportunities between the pulp and the fats and oils. For example, a weak cationic acidic softening agent containing a nonionic surfactant and a cationic surfactant is used at a low concentration of 25 to 35% by mass of the active ingredient, and the viscosity is set to 500 mPa s or less. It may be dispersed and supplied to the stock slurry at an appropriate location of the papermaking equipment such as.

The amount of the softening agent used is adjusted depending on the type of softening agent, but is about 0.2 to 0.5% by mass with respect to the total weight of the pulp fibers. If it is less than 0.2% by mass, a sufficient softening effect may not be obtained, and if it exceeds 0.5% by mass, the fixation rate may not increase.

The type of softener is not necessarily limited, but a combination of a cationic surfactant and a nonionic surfactant is preferred as described above. In addition, emollient components such as higher alcohols, fatty acid esters, and acyl amino acid esters can be added to the extent that the effects of the present invention are not impaired. A small amount of humectant or the like can also be added within the range that does not interfere with the action and effect of the present invention, but does not include the externally added polyol.

Specific examples of emollient ingredients include avocado oil, almond oil, olive oil, camellia oil, sesame oil, rice bran oil, safflower oil, soybean oil, corn oil, rapeseed oil, mustard oil, persic oil, peach kernel oil, castor oil, sunflower oil, Grape seed oil, cottonseed oil, coconut oil, wheat germ oil, rice germ oil, evening primrose oil, hybrid sunflower oil, macadamia nut oil, meadowfoam oil, hazelnut oil, palm kernel oil, palm oil, coconut oil, cocoa butter, shea Fat, Japan wax, mink oil, turtle oil, egg yolk oil, beef tallow, milk fat, lard, horse oil, jojoba oil, carnauba wax, candela wax, rice bran wax, orange roughy oil, beeswax, shellac, lanolin, montan wax, squalene , squalane, liquid paraffin, paraffin, microcrystalline wax, petrolatum, soft liquid isoparaffin, hydrogenated polyisobutylene, ozokerite, ceresin, α-olefin oligomer, polybutene, hydrocarbons such as polyethylene, or lauric acid, myristic acid, Palmitic acid, stearic acid, behenic acid, hydroxystearic acid, oleic acid, linoleic acid, ethylhexanoic acid, isostearic acid, isopalmitic acid, isotridecanic acid, isononanoic acid, pentadecanoic acid, lauryl alcohol, stearyl alcohol, cetearyl alcohol, behenyl alcohol , cetanol, oleyl alcohol, lanolin alcohol, cholesterol, isocholesterol, sitosterol, stigmasterol, isostearyl alcohol, octyldodecanol, hexyldecanol, isopropyl myristate, isopropyl palmitate, butyl stearate, ethyl oleate, cetyl palmitate, myristyl myristate, octyldodecyl myristate, octyldodecyl oleate, cholesteryl stearate, cholesteryl hydroxystearate, tricaprin, trimyristin, trioctanoin, isopropyl isostearate, ethyl isostearate, cetyl ethylhexanoate, stearyl ethylhexanoate, Glyceryl triethylhexanoate, glyceryl triethylhexanoate, trimethylolpropane triethylhexanoate, pentaerythryl tetraethylhexanoate, glyceryl triisostearate, trimethylolpropane triisostearate, pentaerythyl tetraisostearate, triisostearate ntaerythryl, isocetyl isostearate, octyldodecyl dimethyloctanoate, myristyl lactate, cetyl lactate, trioctyldodecyl citrate, and diisostearyl malate. These can be used singly or in combination of two or more.

The cationic surfactant can be appropriately selected from quaternary ammonium salts, amine salts, amines, and the like. Particularly suitable cationic surfactants are quaternary ammonium salts, which are preferably used. Specific examples include dilauryldimethylammonium chloride, distearyldimethylammonium chloride, dimyristyldimethylammonium chloride, dipalmityldimethylammonium chloride, distearyldimethylammonium chloride and the like.

Ester-type, ether-type, ester-ether-type, alkanolamide-type, alkyl glycosides and the like can be used as nonionic surfactants. Examples of ester types include sorbitan fatty acid esters, diethylene glycol monostearate, diethylene glycol monooleate, glyceryl monostearate, glyceryl monooleate,

Propylene glycol monostearate, N-(3-oleyloxy-2-hydroxypropyl) diethanolamine, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitol wax, polyoxyethylene sorbitan sesquistearate, polyoxyethylene monooleate, poly oxyethylene monolaurate and the like. Ether types include polyoxyethylene alkyl ethers and polyoxyethylene alkylphenyl ethers, and specific examples include polyoxyethylene cetyl ethers and polyoxyethylene lauryl ethers.

Here, the ratio of oily components extracted with diethyl ether in the present invention is measured by a rapid residual fat extractor OC-1 manufactured by Intec Co., Ltd., or its equivalent or compatible machine. In this device, a sample is placed in an attached test tube having an extraction port at the bottom, and when a solvent is supplied, the extract drops from the extraction port into a heated aluminum tray located at the bottom, and only the solvent is removed. It is designed to evaporate, and the amount of extracted substance can be determined from the difference in the mass of the extracted liquid before and after dripping onto the aluminum saucer, making it possible to quickly and easily measure the oily components in the sample. Then, the ratio of the extract can be calculated from the amount of the extracted substance and the mass of the sample. In the present invention, the samples are two sets of 3-ply tissue paper, and the amount of diethyl ether used is 10 cc. In addition, the pressing by the push rod is started 60 seconds after diethyl ether is added.

On the other hand, the tissue paper according to the present invention has a lateral bending rigidity of less than 0.006 gf·cm/cm and a lateral bending recovery force of less than 0.005 gf·cm/cm. This range is a low value for a high basis weight non-moisturizing tissue paper with 3 plies and a basis weight of 12.0 g/m ² or more per ply. The tissue paper according to the present embodiment contains a large amount of oily components and weakens the bonding between fibers, and therefore has remarkable characteristics in the physical properties of the paper in the transverse direction. The lateral bending stiffness and lateral bending recovery are measured when the sample is bent perpendicular to the flow direction of the sample. This is when the sample is bent parallel to the direction. Since the lateral bending stiffness and lateral bending recovery force are indices related to bending in the direction perpendicular to the ridgeline of the crepe, if the lateral bending stiffness and lateral bending recovery force are low, the crepe will feel supple and soft. Cheap. The lateral bending stiffness and lateral bending recovery force according to the present invention were measured using a pure bending tester KES-FB2-A manufactured by Kato Tech Co., Ltd., or an equivalent or compatible measuring instrument. value. In addition, in the measurement, the sample was conditioned for 3 hours or more in a constant temperature and humidity chamber at 23°C and 50% humidity, the size of the sample was 200 x 200 mm, the number of measurements was N = 5, and the average value was the measured value. and Bending stiffness is correlated with the softness and stiffness that a person feels when bending an object. In addition, the bending recovery force is said to be correlated with the resilience (elasticity) felt when a person bends an object and returns it to its original shape. considered bad.

Further, the tissue paper according to the present invention preferably has a longitudinal dry tensile strength of 300 to 440 cN and a transverse dry tensile strength of 130 to 200 cN. A particularly preferred transverse dry tensile strength is between 150 and 180 cN. A dry tensile strength in the machine direction in the range of 300 to 440 cN is sufficient dry tensile strength. On the other hand, a 3-ply tissue paper with a transverse dry tensile strength of less than 130 cN is likely to tear during use. On the other hand, if it exceeds 200 cN, it becomes difficult to feel the effect of improving the softness. The tissue paper according to the present invention has particularly low transverse dry tensile strength. The dry tensile strength in the machine direction is the paper strength in the direction in which the crepe is stretched, so the strength is easily adjusted by the crepe. A preferable crepe ratio in manufacturing the tissue paper according to the present invention is 15 to 28%. On the other hand, the dry tensile strength in the transverse direction is the paper strength in the direction perpendicular to the longitudinal direction in which the crepe is stretched. The dry tensile strength in the transverse direction according to the present invention is a slightly low value for 3-ply, and this is because the proportion of oily components extracted with diethyl ether is large, so the hydrogen bonds between fibers are weakened. I think that the. The tissue paper according to the present invention has a dry tensile strength particularly in the general range in the machine direction, but the dry tensile strength in the transverse direction is slightly low, so it is easy to feel softness. The dry tensile strength according to the present invention refers to a value obtained by measuring a sample with a width of 25 mm based on the tensile test of JIS P 8113 (1998). In adjusting the dry tensile strength of the present invention, a known dry paper strength agent can be used. As described above, the tissue paper according to the present invention has a low horizontal dry tensile strength as a 3-ply non-moisturizing high basis weight high-grade type, and furthermore, the horizontal bending rigidity and the horizontal bending recovery force are lower than those of the conventional ones. Excellent softness and smoothness because it is lower than non-moisturizing high basis weight high-end type.

The pulp fiber in the tissue paper according to the present invention is preferably a mixture of NBKP (softwood kraft pulp) and LBKP (hardwood kraft pulp). In particular, the pulp fibers are preferably composed of NBKP and LBKP only, and the mixing ratio is preferably NBKP:LBKP = 20:80 to 80:20, particularly NBKP:LBKP = 30:70 to 60:40. is desirable. Paper strength, softness, etc. can be adjusted by the compounding ratio of NBKP and LBKP. Moreover, the tissue paper according to the present invention can contain known fibers such as chemical fibers, kenaf fibers, and cotton fibers within a range that does not impair the effects of the present invention.

Next, the physical properties of the tissue paper according to the present invention in Examples and Comparative Examples were measured and sensory tests were conducted. The composition and physical property values in each example are as shown in Table 1 below. Moreover, the method for measuring each physical property value is as described above. In Comparative Example 1, the paper thickness, bending resistance, and bending recovery amount are not within the range of the present invention, but the extracted oil content is within the range of the present invention. Comparative Examples 2 to 5 are two-ply high-grade types having a basis weight of 14.0 g/m ² or more per ply.

Examples 1 and 2 contain a nonionic surfactant and a cationic surfactant as a softening agent, and use a weakly cationic acidic softening agent at a low concentration of 25 to 35% by mass of active ingredient and a viscosity of 500 Pa.・It was used so as to increase the fixation rate with s or less. The amount of the softening agent used was 0.35% by mass in Example 1 and 0.40% by mass in Example 2, based on the pulp mass ratio. The pulp fibers in Examples 1 and 2 were 100% virgin pulp and did not contain waste paper pulp.

Moreover, the sensory test was evaluated as follows. Comparative Example 2, which is a commercially available product, was used as a reference sample. Comparative Example 1 was highly evaluated in terms of softness and smoothness in advance, and exhibited the highest value among Comparative Examples in terms of the amount of oily components extracted with diethyl ether. In the evaluation method, the reference sample was evaluated with 4 points, and the samples of other examples were evaluated with 1 to 7 points in comparison. As a rough standard, subjects were given 1 point: much worse than the reference sample (dislike), 2 points: worse than the reference sample (dislike), 3 points: slightly worse than the reference sample (dislike), 4 points. Points: same as the reference product, 5 points: slightly better than the reference product (favorite), 6 points: better than the reference product (favorite), 7 points: much better than the standard product (favorite). .

For evaluation of smoothness, one set of tissue paper was folded in half lengthwise, the half-folded sample was placed on a horizontal table with a smooth surface, and the index finger was slid once from end to end in the horizontal direction. I tried to judge the smoothness at the time. Softness, moist feeling, and preference were evaluated by subjects freely touching a set of tissues. There were 11 subjects, and the numerical values in the table are their average values. FIG. 1 shows a graph of the results.

As the results are shown in Table 1, it can be confirmed that the amount of extracted oily component is high in Examples, and the oily component is fixed. Moreover, on the other hand, the moisture content is equivalent to that of the comparative example, and does not have hygroscopicity like polyol. In addition, the physical property value of bending rigidity in the lateral direction is low, indicating that the bending resistance of one tissue is low. The physical property value of the lateral bending recovery property is low, indicating that the bending recovery property of one tissue is good. The results of the sensory evaluation are very good compared not only with Comparative Example 2, which is the reference sample, but also with all other comparative examples.

Comparative Example 1 has a slightly lower basis weight, a higher paper thickness than the present invention, and an excessively low density. If the density is excessively low in this way, the vertical and horizontal dry tensile strengths are low, but the flexural recovery and flexural rigidity are not sufficiently reduced, and the evaluation of softness and smoothness is not enhanced. It is considered that this is because the thickness of one tissue sheet is large, and the flexural rigidity is increased. Looking at the results of Comparative Example 1 in comparison with the examples of the present invention, it was found that the examples of the present invention had low bending recovery and bending rigidity, and in particular had low bending recovery in the lateral direction. Both lateral bending stiffness is low, and the sensory evaluation is significantly enhanced.

Furthermore, when compared with Comparative Examples 2 to 4, Comparative Examples 2 to 4 are 2-ply, and the total basis weight and paper thickness are higher in Examples. However, the examples have a large extracted oil content, a low bending recovery property and a low bending rigidity in the lateral direction, and a high sensory evaluation. Moreover, the dry tensile strength is high.

In this way, by using the 3-ply tissue paper according to the present invention, it is possible to provide a non-moisturizing tissue paper with a high basis weight that is superior in softness and smoothness, and also has firmness and thickness.

Claims (3)

A 3-ply tissue paper to which polyol is not externally applied ,
The basis weight per ply is 12.0 g/m ² or more,
The thickness of the 3-ply paper is 200 to 265 μm,
Moisture content is 4.0 to 9.0% by mass,
A weak cationic acidic softening agent containing a nonionic surfactant and a cationic surfactant at a low concentration of 25 to 35% by mass of the active ingredient and a viscosity of 500 mPa s or less, with respect to the total weight of the pulp fiber. .Manufactured by dispersing and supplying to the paper material slurry so that the amount used is 2 to 0.5% by mass,
Contains 0.15 to 0.45% by mass of an oily component derived from an internal additive extracted with diethyl ether,
A tissue paper having a lateral bending rigidity of less than 0.006 gf·cm/cm and a lateral bending recovery force of less than 0.005 gf·cm/cm. The dry tensile strength in the longitudinal direction is 300 to 440 cN,
a transverse dry tensile strength of 130 to 200 cN;
The tissue paper according to claim 1. The tissue paper of claim 1, which does not contain glycerin.

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