JP2006042881A - Household hygiene tissue paper - Google Patents

Abstract

The present invention provides a household sanitary thin paper that has flexibility and maintains water absorption to the extent that it can function as a sanitary thin paper, and has reduced moisture penetration without unevenness.
A quaternary ammonium salt having an alkyl group and / or an alkenyl group as a water repellent agent is contained in an amount of 0.02 to 0.5% by weight based on the dry weight of the pulp slurry with respect to the pulp. Alternatively, the sizing agent is contained in an amount of 0.02 to 0.06% by weight based on the dry weight of the pulp slurry with respect to the pulp dry weight, and the water repellent or sizing agent is mixed in the pulp slurry at the time of papermaking. Then, a household sanitary thin paper having a water absorption rate of 3.5 to 35 seconds and a water permeability of 6 sheets or less is obtained. As the water-repellent agent for the quaternary ammonium salt having an alkyl group and / or alkenyl group, it is desirable to use, for example, dimethyl monoalkyl ammonium halide or trimethyl monoalkyl ammonium halide from the viewpoint of imparting flexibility.
[Selection figure] None

Description

  The present invention relates to a household sanitary thin paper such as tissue paper, toilet paper, kitchen towel and the like, and more particularly to a home sanitary thin paper with reduced moisture penetration.

  Conventionally, many tissue papers have been provided on the market as household sanitary thin paper. This type of sanitary thin paper is used for, for example, biting the nose in the case of a cold, wiping off filth during defecation, removing makeup, etc. It is also used for wiping liquids spilled on tables and floors as an alternative to cleaning cloths.

  However, household hygiene thin paper that has been used so far is manufactured with an emphasis on improving the feeling of touch and water absorption, and the absorbed moisture often goes through, Due to adhesion or weakness, the sheet is often torn just by absorbing a little more moisture, giving the user unpleasant feeling. In this case, the strength of the sheet has been improved by increasing the weight of the rice sheet or by laminating, but in this method, the cost is increased and the flexibility of the sheet is impaired. This is not preferable because the feeling of use becomes worse.

In view of the above-described problems, a technique has been proposed in which the show-through is reduced without increasing the cost by including a water repellent. For example, in the following Patent Document 1, a toilet tissue including a first cellulose ply and a second cellulose ply, and a water repellent (size agent, hydrophobic chemical substance) printed or spray-applied on a mating surface portion of each cellulose ply. Alternatively, a toilet tissue in which a water repellent layer is interposed between the cellulose plies has been proposed.
JP 2002-519533 A

  However, the toilet tissue product described in Patent Document 1 has a water repellent layer formed as an intermediate layer, and therefore has water absorption similar to that of conventional tissues until moisture reaches the water repellent layer. Therefore, there is a problem that the product is easily sticky. In addition, when moisture penetrates beyond the water repellent layer, it is impossible to prevent back-through, and if a large amount of sizing agent is added, the water absorption is impaired and the original function of the product may not be performed.

  Therefore, a main object of the present invention is to provide a household sanitary thin paper that has flexibility and maintains water absorption to the extent that it can function as a sanitary thin paper, and has reduced moisture penetration without unevenness.

  In order to solve the above-mentioned problem, as the present invention according to claim 1, a quaternary ammonium salt having an alkyl group and / or an alkenyl group as a water repellent is added in a solid content weight of 0 with respect to the dry weight of the pulp slurry. 0.02 to 0.5% by weight or 0.02 to 0.06% by weight of the sizing agent based on the dry weight of the pulp slurry with respect to the pulp dry weight, and the water repellent or sizing agent Provides a sanitary thin paper for household use characterized in that it is mixed in a pulp slurry at the time of papermaking.

  In the present invention according to claim 1, a quaternary ammonium salt having an alkyl group and / or an alkenyl group having a softening effect as a water repellent is added to the hygienic thin paper for household use with respect to the dry weight of the pulp slurry with respect to the pulp. It contains 0.02 to 0.5% by weight in terms of solid content, or 0.02 to 0.06% by weight in terms of solid content with respect to the dry weight of the pulp slurry. It is possible to reduce the breakthrough of moisture without impairing the water absorption to such an extent that it can function as a sanitary thin paper. In addition, since the water repellent or sizing agent is mixed in the pulp slurry at the time of paper making, the water repellent or sizing agent is uniformly dispersed in the paper fiber. Can be reduced.

  As the present invention according to claim 2, there is provided a household sanitary thin paper according to claim 1 having a water absorption rate of 3.5 to 35.0 seconds and / or a water permeability of 6 sheets or less.

  “Water absorption rate” and “water permeability” in the present invention are test values according to the test procedure described later. The smaller the numerical value, the higher the water absorption, and the higher the water permeability, the more permeable. It will be expensive. The “water absorption rate” and “water permeability” preferably satisfy both conditions at the same time.

  As the present invention according to claim 3, the water-repellent agent of the quaternary ammonium salt having an alkyl group and / or alkenyl group is dimethyl monoalkyl ammonium halide or trimethyl monoalkyl ammonium halide. A home hygiene thin paper as described in 1 above is provided. The dimethylmonoalkylammonium halide and trimethylmonoalkylammonium halide are also used as a softening agent, and can impart flexibility as well as water repellency.

As the present invention according to claim 4, the basis weight is 10 to 35 g / m ² , the paper thickness is 80 to 200 μm, the dry tensile strength based on JIS P 8113 is (longitudinal direction) 200 to 400 cN / 15 mm, (transverse direction) 60 It is -200 cN / 15mm. The household sanitary thin paper in any one of Claims 1-3 is provided.

  In the present invention described in claim 4 above, the basis weight, the paper thickness, and the dry paper strength are defined within the predetermined ranges, so there is no feeling of stickiness, moderate flexibility, and a required strength during use. Will come to be.

  As described above in detail, according to the present invention, it is possible to reduce moisture see-through without unevenness while maintaining water absorption that is flexible and can function as sanitary thin paper.

  Hereinafter, the present invention will be specifically described in detail.

[First embodiment]
The household sanitary thin paper according to the present invention contains a quaternary ammonium salt having an alkyl group and / or an alkenyl group as a water repellent at a predetermined ratio, and the water repellent is mixed into the pulp slurry during paper making. It is manufactured. For example, after mixing the water repellent in a pulp slurry containing hardwood kraft pulp (LBKP) and softwood kraft pulp (NBKP), the paper is made to make the water repellent uniformly dispersed throughout the paper. be able to.

  As the water repellent, a quaternary ammonium salt having an alkyl group and / or an alkenyl group is used as described above, and as the quaternary ammonium salt, a halide is easily compounded. Desirably, dimethyl monoalkyl ammonium halide and trimethyl monoalkyl ammonium halide can be used alone or in combination. Further, among the halides, chloride is desirable because it is the most common. Specifically, dimethyl dilauryl ammonium chloride, trimethyl monolauryl ammonium chloride, dimethyl dicetyl ammonium chloride, trimethyl monocetyl ammonium chloride, dimethyl dipalmityl ammonium chloride, trimethyl monopalmityl ammonium chloride, dimethyl distearyl ammonium chloride, Trimethyl monostearyl ammonium chloride, dimethyl dioleyl ammonium chloride, trimethyl monooleyl ammonium chloride, dimethyl dibehenyl ammonium chloride, trimethyl monobehenyl ammonium chloride, polyalkyleneoxy monomethyl monooleyl ammonium chloride, polyalkyleneoxy monomethyl dioleyl ammonium chloride Can be exemplified de alone or a combination of two or more.

  In particular, among the compounds listed above, dimethyl dilauryl ammonium chloride, dimethyl dioleyl ammonium chloride, trimethyl monooleyl ammonium chloride, trimethyl monostearyl ammonium chloride, polyalkyleneoxy monomethyl monooleyl ammonium chloride, polyalkyleneoxy monomethyl dioleyl Ammonium chloride alone or in combination of two or more is desirable because it has the most flexible effect.

  The water absorption speed of the household sanitary thin paper is 3.5 to 35 seconds, preferably 5.5 to 35 seconds. This "water absorption speed" test uses a digital micropipette, stopwatch, tripod stand as a measuring instrument, puts two specimens as a set on a support base with a hole with a diameter of 40 mm or more in the center, and attaches it to a digital micropipette. Take 5 μm of distilled water and drop it onto the test piece from a height of about 10 mm. The time from when the water droplet contacts the test piece until the water is completely absorbed and the reflection on the paper surface disappears is 0. This is a test measured in units of 01 seconds. The test is performed 5 times, and the average value is a value obtained by the test procedure for recording to the first decimal place.

  When this water absorption speed is less than 3.5 seconds, the strikethrough reduction effect desired by the present invention cannot be obtained. Conversely, if the water absorption speed exceeds 35 seconds, the original function of sanitary thin paper, which is too water-repellent and absorbs moisture, may be impaired.

  In addition, it is desirable that the household sanitary thin paper has a water permeability of 6 sheets or less, preferably 3 to 6 sheets. This “water permeation” test is a numerical value obtained by counting the number of infiltrated sheets when 10 sheets are stacked and 1.3 ml of water is dropped and it is visually confirmed that all of the water has infiltrated. . If the water permeation degree exceeds 6, the effect of reducing the breakthrough desired by the present invention cannot be obtained. In particular, when the water permeability is in the range of 3 to 6, the water absorption performance and the back-through prevention effect are balanced and the usability is improved.

  In order to satisfy the water absorption rate and water penetration rate, the water repellent is 0.02 to 0.5% by weight, preferably 0.05 to 0.25% by weight in solid content with respect to the dry weight of the pulp slurry with respect to the pulp. It is made to contain in the ratio of weight%, More preferably, 0.1 to 0.2 weight%. When the water repellent content is less than 0.02% by weight, the water repellent effect desired by the present invention cannot be obtained. On the other hand, if the content of the water repellent exceeds 0.5% by weight, the water repellency is so strong that it may not be possible to absorb moisture, and the production cost increases. In particular, when the water repellent content is in the range of 0.1 to 0.2% by weight, a balance is achieved in any of water repellency, water absorption, and cost.

On the other hand, the household thin paper can basically include kitchen towels, etc. in addition to those usually used as tissue paper and toilet tissue paper, but when the thin paper is tissue paper, toilet tissue paper, US basis weight is 10 to 35 g / m ² , paper thickness is 80 to 200 μm, dry tensile strength based on JIS P 8113 is (longitudinal direction) 200 to 400 cN / 15 mm, (transverse direction) 60 to 200 cN / 15 mm. It is desirable to use some. Within these numerical ranges, there is no feeling of creaking, moderate flexibility, and required strength is ensured during use.

[Second embodiment]
In the first embodiment, a quaternary ammonium salt having an alkyl group and / or an alkenyl group is used as the water repellent, but a sizing agent can also be used. As the type of sizing agent, neutral sizing agents such as alkyl ketene dimers, alkenyl succinic anhydrides and stearic anhydrides, acidic sizing agents such as saponified natural rosin and reinforced rosin can be used.

  The sizing agent contains a small amount of 0.02 to 0.06% by weight as a solid content based on the dry weight of the pulp slurry with respect to the pulp dry weight, so that the water absorption rate is 3.5 to 35.0 seconds, and / Or water penetration degree can be 6 sheets or less. If the addition rate is less than 0.02% by weight, the penetration of moisture cannot be sufficiently reduced. If it exceeds 0.06% by weight, the water repellency is too strong. In particular, since the sizing agent has a property of rapidly increasing the water repellency when it is contained in an amount of 0.05% by weight or more, the sizing agent is preferably added in an amount of 0.02 to 0.04% by weight.

[Other examples]
(1) When the use of the sanitary thin paper is toilet tissue paper, it is desirable that the water decomposability based on JIS P 4501 is 20 to 40 seconds, more preferably 25 to 30 seconds. If water disintegration is less than 20 seconds, strength characteristics may not be ensured, and if it exceeds 40 seconds, clogging in the toilet may be caused.

  What contained dimethylmonoalkylammonium halide as a water repellent in an amount of 0.1% by weight (Example 1), contained 0.2% by weight (Example 2), and contained an alkyl ketene dimer as a sizing agent. (Example 3), 0.04% by weight (Example 4), 0.06% by weight (Example 5) , 0.005% by weight (Comparative Example 1), 0.01% by weight (Comparative Example 2), and no water repellent and no sizing agent (Comparative Example 3) The test specimen was measured for rice tsubo, water absorption rate, and water permeability. The results are shown in Table 1.

  Sanitary thin paper is made from pulp slurry blended at a ratio of hardwood kraft pulp (LBKP): softwood kraft pulp (NBKP) = 9: 1 using water for papermaking at pH 8.0, and then at a temperature of 80 ° C. It was dried for 120 seconds.

Claims (4)

  A quaternary ammonium salt having an alkyl group and / or an alkenyl group as a water repellent is contained in an amount of 0.02 to 0.5% by weight based on the dry weight of the pulp slurry, or a sizing agent Household characterized by containing 0.02 to 0.06% by weight of solid content with respect to the dry weight of pulp slurry, and the water repellent or sizing agent is mixed in the pulp slurry during paper making Sanitary tissue paper.   The hygienic thin paper for household use according to claim 1, wherein the water absorption speed is 3.5 to 35.0 seconds and / or the water permeability is 6 sheets or less.   The household sanitary thin paper according to any one of claims 1 and 2, wherein the water repellent of the quaternary ammonium salt having an alkyl group and / or an alkenyl group is dimethyl monoalkyl ammonium halide or trimethyl monoalkyl ammonium halide. 2. The basis weight is 10 to 35 g / m ² , the paper thickness is 80 to 200 μm, and the dry tensile strength based on JIS P 8113 is (longitudinal direction) 200 to 400 cN / 15 mm, (transverse direction) 60 to 200 cN / 15 mm. -Household sanitary thin paper as described in any one of.