JP5455356B2 - Sanitary tissue paper products and method for producing the same - Google Patents

Description

  The present invention relates to a sanitary thin paper product in which a bundle of a plurality of folded sanitary thin papers is stored in a storage box.

Toilet paper is mainly used for wiping the skin, and therefore, smoothness and softness of the surface are required. In response to such demands from consumers, toilet paper that has been improved in surface smoothness and softness by carrying a hydrophilic softener or the like has been commercialized. However, since such characteristics as softness and smoothness are always desired by consumers, the manufacturing industry of sanitary thin paper such as toilet paper has a challenge to further improve these characteristics. Is done.
On the other hand, since toilet paper is discarded into the toilet drainage system after use, rapid water absorption and high water disintegration have been demanded.
Conventionally, softeners for improving softness and smoothness generally do not affect water disintegration or improve water disintegration due to a decrease in paper strength or the action of a hydrophilic function. There was no problem.
However, in recent years, with the widespread use of shower toilets, it has become important to prevent moisture from falling through the toilet paper, and it has been difficult to achieve both this prevention of penetration and the above-mentioned water disintegrating property.
Therefore, in order to deal with such problems, in toilet paper, the number of base paper layers (the number of plies) has a multi-layer structure of 3 plies or more, and the fiber density is increased by promoting the beating of pulp fibers as raw material of the base paper Such a multilayer structure is accompanied by an increase in the paper thickness. However, in the case of rolled toilet paper, the roll length (overall length) is shortened, resulting in a product that decreases quickly, and the high density of pulp. In addition, there are problems in production such as deterioration of dewaterability during production, and above all, an increase in the number of layers and an increase in pulp density have a problem of degrading water disintegration, softness and smoothness.
JP 2005-225562 A

  Accordingly, a main problem to be solved by the present invention is to provide a toilet paper that is soft and smooth, and that is compatible with both prevention of moisture penetration and water disintegration.

The present invention that has solved the above-described problems and the effects thereof are as follows.
<Invention of Claim 1>
It has a two-ply laminated structure in which two base papers are laminated,
The paper thickness is 150 to 300 μm, the base weight based on JIS P 8124 of the base paper is 15 g / m ² or less,
Each base paper has a fatty acid amide sizing agent of 1.2 to 2.4 kg per ton of dry pulp raw material, and a nonionic surfactant or a cationic surfactant as a softening agent is 0.1 to 2.0 kg. Toilet paper, characterized in that it is made from paper-making raw materials.

<Invention of Claim 2>
The toilet paper according to claim 1, wherein the toilet paper is made from a papermaking raw material containing 0.1 to 2.0 kg of a humectant per ton of dry pulp raw material.

<Invention of Claim 3>
The toilet paper according to claim 1 or 2, wherein the softness is 2.80 gf or less, and the average deviation (MMD) of the friction coefficient of the surface is 11.0 or less.

<Invention of Claim 4>
A papermaking raw material containing 0.1 to 2.0 kg of a nonionic surfactant or a cationic surfactant as a softening agent and 1.2 to 2.4 kg of a fatty acid amide sizing agent as a softening agent per ton of dry pulp raw material is made. Then, after obtaining a base paper having a basis weight of 15 g / m ² or less based on JIS P 8124, two sheets of this base paper are laminated to obtain a toilet paper having a two-ply laminated structure with a paper thickness of 150 to 300 μm. A method for producing toilet paper, which is characterized.

<Invention of Claim 5>
The method for producing toilet paper according to claim 4, wherein a papermaking raw material containing 0.1 to 2.0 kg of a humectant is produced per ton of dry pulp raw material.

  According to the present invention described above, a toilet paper that is soft and smooth and that is compatible with prevention of moisture penetration and water disintegration is provided.

Next, a particularly preferred embodiment of the water-decomposable sanitary thin paper according to the present invention will be described taking toilet paper as an example. The present invention is not limited to this embodiment.
[Example of structure]
The toilet paper in the present embodiment can preferably take a roll-like form, which is also called a toilet roll generally taken in the product form.
In addition, the toilet paper of this embodiment may be a so-called single type that does not have a ply structure using a strip-shaped continuous sheet as a base paper as it is, or may have a structure of two or more plies in which two or more sheets are stacked. The two-ply structure is desirable from the viewpoint of achieving both water disintegration and back-through prevention.
The roll form and the continuous sheet ply structure can be achieved by a known winding technique and a known ply bonding technique.

On the other hand, the toilet paper of the present invention can be given a pattern preferably by printing so as to have a high-class feeling.
Here, there are no particular limitations on the specific design P or the formation range, size, shape, etc. of the pattern P constituting the pattern, and designs such as logo marks, numbers, letters, geometric patterns, and appropriate sizes are not limited. Can be selected.
As the ink used for forming the pattern, a known ink used for printing on thin paper such as toilet paper and tissue paper can be used regardless of dye ink or pigment ink. If a pattern is formed by printing with these inks, a design different from the ground color can be given.
Although not limited, it is desirable that the difference ΔL * of the L * value in the L * a * b * color system between the colored portion and the ground portion is 3.0 or more. The L * value can be measured using, for example, a measuring device “PF-10” manufactured by Nippon Denshoku Industries Co., Ltd.

On the other hand, the continuous sheet which is the base paper constituting the toilet paper of the present embodiment is manufactured from a papermaking raw material using pulp as a main raw material.
The pulp used as a raw material is not particularly limited. An appropriate raw material pulp can be selected and used according to the use of the water-degradable sanitary thin paper. Specifically, from wood pulp, non-wood pulp, synthetic pulp, waste paper pulp, etc., more specifically, groundwood pulp (GP), stone grand pulp (SGP), refiner ground pulp (RGP), pressure type Mechanical pulp (MP), chemical mechanical pulp (CGP), semi-chemical pulp (such as ground pulp (PGW), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), bleach chemithermomechanical pulp (BCTMP)) Chemical pulp (SCP), kraft pulp (KP) such as hardwood bleached kraft pulp (LBKP), softwood bleached kraft pulp (NBKP), soda pulp (AP), sulfite pulp (SP), dissolved pulp (DP), etc. CP), nylon, rayon, polyester, polyvinyl alcohol (PV ) And other raw paper pulp such as deinked pulp (DIP) and waist pulp (WP), ground pulp (TP), cotton, flax, hemp, jute, manila hemp, ramie, etc. One or several kinds of straw pulp, esparto pulp, bagasse pulp, bamboo pulp, sesame pulp such as kenaf pulp, auxiliary pulp such as bast pulp and the like can be appropriately selected and used.

  In particular, the pulp is preferably a blend of NBKP and LBKP. Waste paper pulp may be blended as appropriate, but in terms of texture and the like, it is preferably composed only of NBKP and LBKP. In this case, the blending ratio is NBKP: LBKP = 30: 70 to 50:50. In particular, NBKP: LBKP = 40: 60 is particularly desirable.

  The papermaking raw material with the pulp as the main raw material is a known thin papermaking process, specifically, a wire part that transports the papermaking raw material on a papermaking net, a press part that performs dewatering, and a contact with a dryer such as a Yankee dryer. After drying, the paper is made through a dryer part that is peeled off from the dryer while a crepe is provided by a crepin doctor, and a continuous sheet is obtained.

  In this papermaking, known chemical solutions such as dispersants, pH adjusters, antifoaming agents, preservatives, fluorescent dyes, flow modifiers, yield improvers, and the like can be used as appropriate.

Here, in the toilet paper concerning this invention, the above-mentioned continuous sheet which comprises this characteristically is 0.1-2.0 kg of softening agents and 1.2-3. It is made from a papermaking raw material containing 6 kg. In addition, the compounding quantity of the said softener more preferable in a papermaking raw material is 0.3-0.7 kg per ton of dry raw material pulp, and the compounding quantity of a sizing agent is 1.8-2.5 kg.
In such a continuous sheet, the softening agent improves the evaluation of the softness of the user by increasing the flexibility of bonding between fibers and the flexibility of the fibers themselves by penetration into the fibers.

  In addition, since the hydrophilic group and lipophilic group of the sizing agent are present, the hydrophilic group side is located on the fiber side and the lipophilic group side is oriented outward on the surface of the continuous sheet. When the user touches the sheet surface, the user feels smooth, and the user's evaluation of the feeling of smoothness is improved.

And especially in the toilet paper according to the present invention, the effect of improving the smoothness feeling by the sizing agent and the effect of improving the softness by the softening agent are synergistically exhibited, and the improvement of both effects is felt very well by the user. Will be.
In addition, the oleophilic group oriented toward the outside of the sizing agent prevents bleeding of water and water-soluble substances, prevents them from spreading in the direction along the surface of the continuous sheet and in the sheet, Penetration into the interior of the sheet is somewhat suppressed, and the effect of preventing the breakthrough is enhanced.
That is, by adopting the configuration of the present invention, the softness and smoothness are further improved, and the effect of preventing the back-through is also exhibited.

  In addition, if the addition amount of the sizing agent is less than the above range, the effect of improving the surface property of the continuous sheet is low, and the difference in evaluation from the conventional example is not clear. The peelability of the resin deteriorates, and the risk of manufacturing troubles with unstable quality increases.

Here, the above-described back-through prevention effect is more remarkably exhibited particularly when the toilet paper is laminated with two or more plies of continuous sheets. To explain this, as shown in FIG. 1, first, as shown in FIG. 1A, when a large amount of water W comes into contact with one of the laminated continuous sheets, the continuous sheet is prevented by the effect of suppressing water penetration of the sizing agent. 1 (the dotted line arrow in FIG. 1 indicates the movement of moisture, and the thickness of the line indicates the amount of moisture). Shortly thereafter, as shown in FIG. 1B, penetration of the continuous sheet 1 in the depth direction proceeds at the portion of the continuous sheet 1 where moisture first touched. Further, almost at the same time, moisture reaches the inner surface 10 side of the laminated sheet 10 with the other continuous sheet 2 on which the moisture spread along the surface of the continuous sheet 1 is laminated. At this time, much of the moisture is absorbed in the previous continuous sheet 1 and the amount transferred to the other continuous sheet 2 side is small. Then, as shown in FIG. 1C, the moisture that has been reduced in quantity makes extensive contact with the other continuous sheet 2 on the side of the laminated inner surface 10, and other continuous on the contact surface. Since it spreads along the sheet 2, it is difficult to reach the laminated outer surface 15 side of the other continuous sheet 2.
From such an effect, it is desirable that the toilet paper according to the present invention has a two-ply structure or more, particularly two-ply in consideration of water disintegration.

Here, as the sizing agent, alkyl ketene dimer, fatty acid amide sizing agent, neutral sizing agent such as alkenyl succinic anhydride, stearic anhydride, acidic sizing agent such as saponified natural rosin, reinforced rosin, etc. are known. In the present invention, a fatty acid amide sizing agent is used.
In addition, as the softening agent, anionic surfactants, nonionic surfactants, cationic surfactants and zwitterionic surfactants are known. In the present invention, canionic surfactants or nonionic surfactants are used. Use the agent.
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 And polyoxyethylene lauryl ether.
Examples of the cationic surfactant include quaternary ammonium salts, amine salts and amines.
Examples of the anionic surfactant include carboxylate-based, sulfonate-based, sulfate ester-based, and phosphate ester-based surfactants .
As the zwitterionic detergent, carboxy, and the like secondary or aliphatic derivatives of tertiary amines or heterocyclic secondary or aliphatic derivatives of tertiary amines, containing sulfonate, sulfate .

On the other hand, in the toilet paper of this embodiment, preferably, the continuous sheet is made from a papermaking raw material containing 0.1 to 2.0 kg, more preferably 1.0 to 1.5 kg of a humectant per ton of dry raw material pulp. It should be good.
The moisturizing agent improves the texture such as moist feeling along with the softness and smoothness, and the texture evaluation by the user is high.
In addition, since the humectant has a high affinity with moisture and aqueous substances, it also has the effect of increasing the moisture retention amount of the sheet itself. This, combined with the slow penetration of the continuous sheet accompanying the addition of the sizing agent, enhances the effect of preventing the breakthrough.

  Here, specific examples of the humectant include polyhydric alcohols such as glycerin, diglycerin, propylene glycol, 1,3-butylene glycol, and polyethylene glycol, sorbitol, glucose, xylitol, maltose, maltitol, mannitol, trehalose, and the like. What uses at least 1 sort (s) of saccharides, a glycol-type solvent, and its derivative (s) is mentioned.

On the other hand, the toilet paper according to the present invention preferably has a rice basis weight of 15 g / m ² based on JIS P 8124. The lower limit is appropriately determined, but if it is less than 13 g / m ² , the effect of preventing see-through cannot be expected. In addition, when adopting a laminated structure, the sum total of the rice paper of a laminated sheet is the rice paper of the sanitary thin paper said to this invention. This rice tsubo is a low US tsubo compared with conventional products. Since the toilet paper of the present invention has a high anti-breakthrough prevention property as described above, it can be set to such a low rice floor. In addition, toilet paper with a low rice floor area can be manufactured with a small amount of papermaking raw material, which is cost-effective. It also has an advantageous effect in terms of softness. In the present invention and the specification, the weight of rice is the value measured based on the method for measuring the weight of rice in JIS P 8124.

  On the other hand, the paper thickness of the toilet paper according to the present invention can be the same as that of general toilet paper. In other words, the toilet paper according to the present invention has an effect of preventing the fall-through, and therefore it is not necessary to excessively increase the paper thickness to cope with the shower toilet. A specific paper thickness can be 150 to 300 μm.

  As a measuring method of the paper thickness, it can be measured using a dial thickness gauge (thickness measuring instrument), for example, “PEACOCK G type” (manufactured by Ozaki Seisakusho) under the conditions of JIS P8111. The specific measurement procedure is to confirm that there is no dust, dust, etc. between the plunger and the measurement table. Then, place the plunger on the measurement table and move the dial thickness gauge memory to adjust the zero point. Then, the plunger is raised and a sample (for example, toilet paper) is placed on the test bench, and the plunger is slowly lowered to 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.

(Example)
Next, physical properties were measured and sensory tests were performed on the sanitary thin paper according to the present invention and the comparative example. The physical properties and test results according to each example are as shown in Table 1 below. In each example, a softening agent, a sizing agent, and a humectant were added internally to the papermaking raw material.
In the test, the rice tsubo was measured according to JIS P 8124, and the paper thickness was measured by a dial thickness gauge according to the above-described measurement procedure.
The dry paper strength was measured according to JIS P8113.
The average deviation (MMD) of the friction coefficient of the surface was measured using “Friction Sense Tester KES SE” manufactured by Kato Tech Co., Ltd. under the conditions specified in JIS P8111. MMD is the average deviation of the coefficient of friction between the paper and the contact, and is generally represented by a value 100 times the measured value. In addition, the contact surface of the contactor used for the measurement was 10 mm × 10 mm, and the contact surface was formed by arranging a plurality of piano wires densely. MMD means that the larger the value, the less smooth.
Softness is JAPAN TAPPI No. According to the handle ohm method described in No. 34, the sample pan clearance was measured as 5 mm.

  In the penetration test, 1000 μl of water was almost uniformly wetted on a 3 cm × 4 cm board, and a set of 15 samples was placed on the board as a set, and a weight was placed immediately after the set. When the weight is removed immediately thereafter, the number of samples on which the water on the board has reached is evaluated. The evaluation values in the table are average values of five tests.

  The sensory test is performed by a method in which 10 subjects actually use the toilet paper according to the example and the comparative example, and evaluate how to feel the softness and the smoothness of the surface by assigning a score of 1 to 5 points. It was. The higher the score, the better.

As shown in the softness and MMD test results in Table 1, in Examples 1 to 3, both Comparative Example 1 and softness and smoothness are excellent. Moreover, about Example 4, it is substantially equivalent regarding softness and smoothness.
Moreover, as a result of the penetration test, Examples 1 to 4 of the present invention are almost equivalent to Comparative Example 1 having a high rice basis weight, and Example 3 has no inferiority. From this, it can be understood that the back-through prevention is enhanced in this embodiment.
Further, the paper thickness and paper strength are in a sufficient range as thin paper used for general toilet rolls in both Examples and Comparative Examples.
Moreover, about Examples 1-3 of this invention, it has the water decomposability superior to the comparative example 1. FIG. Example 4 is also substantially equivalent to Comparative Example 1.

  As a result, the toilet paper according to the present invention is excellent in softness and smoothness, and has improved anti-back-through and water disintegration properties. Furthermore, it can be said that the raw material cost is low due to the low rice tsubo. These effects can be remarkably read about particularly preferred Examples 1 to 3, particularly Examples 2 and 3.

  From the above, according to the present invention, there is provided a toilet paper that is soft and smooth and that is compatible with both prevention of moisture penetration and water disintegration.

It is a figure for demonstrating the effect | action of the penetration prevention of the water | moisture content of the sanitary thin paper of this invention.

  DESCRIPTION OF SYMBOLS 1, 2 ... Continuous sheet, 10 ... Laminated inner surface, 15 ... Laminated outer surface, X1 ... Toilet paper, W ... Many moisture, Wx ... Infiltrated moisture.

Claims (5)

It has a two-ply laminated structure in which two base papers are laminated,
The paper thickness is 150 to 300 μm, the base weight based on JIS P 8124 of the base paper is 15 g / m ² or less,
Each base paper has a fatty acid amide sizing agent of 1.2 to 2.4 kg per ton of dry pulp raw material, and a nonionic surfactant or a cationic surfactant as a softening agent is 0.1 to 2.0 kg. Toilet paper, characterized in that it is made from paper-making raw materials.   The toilet paper according to claim 1, wherein the toilet paper is made from a papermaking raw material containing 0.1 to 2.0 kg of a humectant per ton of dry pulp raw material.   The toilet paper according to claim 1 or 2, wherein the softness is 2.80 gf or less, and the average deviation (MMD) of the friction coefficient of the surface is 11.0 or less. A papermaking raw material containing 0.1 to 2.0 kg of a nonionic surfactant or a cationic surfactant as a softening agent and 1.2 to 2.4 kg of a fatty acid amide sizing agent as a softening agent per ton of dry pulp raw material is made. Then, after obtaining a base paper having a basis weight of 15 g / m ² or less based on JIS P 8124, two sheets of this base paper are laminated to obtain a toilet paper having a two-ply laminated structure with a paper thickness of 150 to 300 μm. A method for producing toilet paper, which is characterized.   The method for producing toilet paper according to claim 4, wherein a papermaking raw material containing 0.1 to 2.0 kg of a humectant is produced per ton of dry pulp raw material.

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