WO2006011463A1

WO2006011463A1 - Domestic sanitary tissue

Info

Publication number: WO2006011463A1
Application number: PCT/JP2005/013615
Authority: WO
Inventors: Yoshinori Shimizu; Hiroshi Ohno; Kazuaki Fujimori
Original assignee: Daio Paper Corporation
Priority date: 2004-07-30
Filing date: 2005-07-26
Publication date: 2006-02-02
Also published as: CN101001560A; KR20070045218A; JP4083153B2; JP2006042881A; KR101211274B1; CN100577076C

Abstract

[PROBLEMS] To provide a domestic sanitary tissue which has softness and which is uniformly reduced in the strike-through of water with the water absorbing capacity of the tissue being kept at such a level that the tissue can function as sanitary tissue. [MEANS FOR SOLVING PROBLEMS] A domestic sanitary tissue having a water absorption speed of 3.5 to 35 seconds and a water penetration of six sheets or less is obtained by incorporating a pulp slurry with 0.02 to 0.5 wt% (in terms of solid matter based on the pulp dry weight of the pulp slurry) of a water repellant consisting of a quaternary ammonium salt having alkyl and/or alkenyl or 0.02 to 0.06 wt% (in terms of solid matter based on the pulp dry weight of the pulp slurry) of a sizing agent in the paper making step. It is preferable from the standpoint of the softness that the water repellant be dimethylmonoalkylammonium halide or trimethylmonoalkyl- ammonium halide.

Description

Specification

Household hygiene tissue paper

Technical field

TECHNICAL FIELD [0001] The present invention relates to household hygiene thin paper such as tissue paper, toilet paper, kitchen towels, and the like, and more particularly to household hygiene thin paper with reduced moisture penetration. Background art

Conventionally, many tissue papers and the like have been provided on the market as household sanitary thin paper. This type of sanitary tissue paper is used not only for biting the nose in the case of colds, for wiping off dirt during defecation, for removing makeup, etc. It is also used for wiping liquids spilled on tables and floors as an alternative to cleaning cloths.

[0003] However, household hygiene thin paper that has been used so far is manufactured with an emphasis on improving water absorption if it feels to the touch, and the absorbed moisture often goes through. Since this sticks to the hand or because the strength is weak, the sheet is often torn just by absorbing a little more water, which is uncomfortable for the user. In this case, the force used to improve the strength of the sheet by increasing the weight of the rice or by laminating, etc. In this method, the cost is increased and the flexibility of the sheet is impaired. This is preferable because it reduces the feeling of use.

[0004] In view of the above problems, a technique has been proposed in which a show-through is reduced without increasing the cost by including a water repellent. For example, in the following Patent Document 1, a first cellulose ply and a second cellulose ply are included, and a water repellent (size agent, hydrophobic chemical substance) is printed or sprayed on the mating surface portion of each cellulose ply. Toilet tissue or toilet tissue in which a water repellent layer is interposed between the cellulose plies has been proposed.

Patent Document 1: Japanese Translation of Special Publication 2002-519533

Disclosure of the invention

Problems to be solved by the invention However, in the toilet tissue product described in Patent Document 1, a layer made of a water repellent is formed as an intermediate layer, and thus it is conventional until moisture reaches the water repellent layer. The product has a water absorption similar to that of other tissues, so that there is a problem that the product is easily sticky. In addition, if moisture penetrates beyond the water repellent layer, it will not be possible to prevent back-through, and if a large amount of sizing agent is added, water absorption may be impaired and the product's original function may not be performed. .

[0006] Therefore, the main problem of the present invention is to provide a household sanitary thin paper that has flexibility and maintains water absorption enough to function as a sanitary thin paper, and that has reduced unevenness in moisture penetration. There is.

Means for solving the problem

[0007] In order to solve the above-mentioned problems, the present invention according to claim 1 is characterized in that a quaternary ammonium salt having an alkyl group and Z or alkell group as a water repellent is used as a dry weight of pulp slurry. The sizing agent is contained in an amount of 0.02 to 0.5% by weight relative to the dry weight of the pulp slurry and 0.02 to 0.06% by weight in terms of the solid content based on the dry weight of the pulp slurry. In addition, a sanitary thin paper for household use is provided in which the water repellent or sizing agent is mixed in a pulp slurry at the time of papermaking.

[0008] In the present invention according to claim 1, the quaternary ammonia salt having an alkyl group and a Z or alkenyl group having a softening effect as a water repellent agent on a household sanitary thin paper. Is contained in an amount of 0.02 to 0.5% by weight based on the dry weight of the pulp slurry, or 0.02 to 0.5% in weight of the sizing agent based on the dry weight of the pulp slurry. The content of 0.06% by weight makes it possible to reduce the penetration of moisture without impairing the water absorption that is flexible and can function as a sanitary thin paper. Further, since the water repellent or sizing agent is mixed in the pulp slurry during papermaking, the water repellent or sizing agent is uniformly dispersed in the paper fiber. Omission can be reduced.

[0009] The present invention according to claim 2 provides the household sanitary thin paper according to claim 1, having a water absorption rate of 3.5 to 35.0 seconds and a Z or water permeability of 6 sheets or less.

[0010] "Water absorption speed" and "water penetration" in the present invention are tests according to the test procedure described later. This is an experimental value. The smaller the numerical value of the water absorption rate, the higher the water absorption. The higher the numerical value, the higher the water permeability. The “water absorption rate” and “water penetration rate” preferably satisfy both conditions at the same time.

[0011] In the present invention according to claim 3, the water-repellent agent of the quaternary ammonium salt having an alkyl group and Z or alkenyl group is dimethyl monoalkyl ammonium halide, trimethyl monoalkyl ammonium halide. Claims 1 and 2V, a household sanitary thin paper according to any one of the above is provided. The dimethyl monoalkyl ammonium halide and the trimethyl monoalkyl ammonium halide are also used as a softening agent, and can impart flexibility as well as water repellency.

[0012] As the present invention according to claim 4, the basis weight is 10 to 35 g / m ² , the paper thickness is 0 to 200 μm, and the dry tensile strength based on JIS P 8 113 (longitudinal direction) is 200 to 400 cN / 15 mm. (Horizontal direction) 60-200cN / 15mm The household hygiene thin paper in any one of Claims 1-3 is provided.

[0013] In the present invention according to claim 4, the US basis weight, the paper thickness, and the dry paper strength are defined within the predetermined ranges, so that the invention has an appropriate flexibility with no wrinkle feeling and is used. Sometimes the required strength is ensured.

The invention's effect

[0014] As described above in detail, according to the present invention, it is possible to reduce the back-through of water without unevenness while maintaining water absorption that is flexible and can function as sanitary thin paper. . BEST MODE FOR CARRYING OUT THE INVENTION

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

[0016] [First embodiment]

The household sanitary thin paper according to the present invention contains a quaternary ammonium salt having an alkyl group and / or an alkyl group as a water repellent at a predetermined ratio, and the water repellent is contained in the pulp slurry during paper making. It has been mixed and 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.

[0017] The water repellent has an alkyl group and a Z or alkenyl group as described above. The power to use quaternary ammonia salt This quaternary ammonium salt can be easily combined with halide! /, Which is desirable, dimethyl monoalkyl ammonium halide, trimethyl mono Alkyl ammonium halides can be used alone or in combination. Further, among the halogenated substances, salty substances are desirable because they are the most common. Specifically, dimethyldilauryl ammonium chloride, trimethyl monolauryl ammonium chloride, dimethyl dicetyl ammonium chloride, trimethyl monocetyl ammonium chloride, dimethyl dipalmityl ammonium chloride, trimethyl mono palmyl ammonium chloride Um chloride, dimethyl distearyl ammonium chloride, trimethyl monostearyl ammonium chloride, dimethyl dioleyl ammo chloride, trimethyl monooleil ammo chloride, dimethyl dibeam ammo chloride, trimethyl monoethyl ammo chloride, poly Alkyleneoxymonomethylmono-reinoreammo-muchloride, polyanoleoxy-monomethyl-dioreoleam-mu-muchlore It can be given alone or a combination of two or more.

[0018] In particular, among the compounds listed above, dimethyldilaurylammonium chloride, dimethyldioleylammonium chloride, trimethylmonooleylammonium chloride, trimethylmonostearylammonium chloride, poly Alkyleneoxymonomethylmono-reinoream-moly chloride, polyanolenoxy-monomethyl-dioreeno-molymum chloride alone or a combination of two or more are desirable because they have the most flexible effect.

[0019] 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 rate” test uses a digital micropipette, stopwatch, and tripod stand as measuring instruments, and a set of two samples placed on a support base with a hole with a diameter of 40 mm or more in the center. Take 5m of distilled water into a micropipette and drop it onto the test piece from a height of about 10mm. From the moment when the water droplet contacts the test piece, the time from when the water is completely absorbed until the reflection on the paper surface disappears. The test is measured in units of 0.01 seconds with a stopwatch. The test is performed 5 times, and the average value is the value obtained by the test procedure for recording to the first decimal place.

[0020] When the 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 water repellency is too strong to absorb moisture. There is a risk of sacrificing the original function of sanitary thin paper.

[0021] Further, 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 penetration” test was done by adding 10 sheets of sheets and dropping 1.3 ml of water and visually confirming that all of the water had penetrated. To do. If the water penetration exceeds 6 sheets, the strikethrough reduction effect 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 effect of preventing the back-through are balanced, and the usability is good.

[0022] 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% in terms of solid content with respect to the pulp dry weight of the pulp slurry. It is made to contain in the ratio of -0.25 weight%, More preferably, it is 0.1-0.2 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, the water repellency, water absorption, and cost are well balanced.

[0023] On the other hand, the household thin paper can basically include kitchen towels and the like in addition to those usually used as tissue paper and toilet tissue paper. The thin paper is tissue paper and toilet tissue paper. In this case, the basis weight is 10 to 35 g / m ² , the paper thickness is 80 to 200 / ζ πι, and the dry tensile strength based on JIS Ρ 8113 (longitudinal direction) 200 to 400 cN / 15 mm (lateral direction) 60 It is desirable to use ones in the range of ~ 200cN / 15mm. Within these numerical ranges, it has moderate flexibility that eliminates the feeling of bumps and ensures the required strength during use.

[Second Example]

In the first embodiment, a quaternary ammonium salt having an alkyl group and a Z or 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 dimer, alkenyl succinic anhydride, and stearic anhydride, and acidic sizing agents such as saponified natural rosin and reinforced rosin can be used. [0025] The sizing agent contains a small amount of 0.02 to 0.06% by weight of the solid content based on the dry weight of the pulp slurry with respect to the pulp, so that the water absorption rate is 3.5 to 35.0. Seconds and Z or water penetration can be 6 or less. If the addition rate is less than 0.02% by weight, the penetration of moisture cannot be reduced sufficiently. If it exceeds 0.06% by weight, the water repellency is too strong. In particular, when the sizing agent is contained in an amount of 0.05% by weight or more, the water repellency becomes sharply strong. Therefore, the sizing agent is preferably added in an amount of 0.02-0.04% by weight.

[Other Examples]

(1) When the use of the sanitary thin paper is toilet tissue paper, it is desirable that the water disintegrability 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 may occur in the toilet.

Example

[0027] As a water repellent, 0.1% by weight of dimethyl monoalkyl ammonium halide (Example 1), 0.2% by weight (Example 2), sizing agent In this case, the alkyl ketene dimer was added in an amount of 0.02% by weight in solid content (Example 3), 0.04% in weight (Example 4), and 0.06% in weight. (Example 5), 0.005% by weight (Comparative Example 1), 0.01% by weight (Comparative Example 2), no water repellent and no sizing agent !, For each specimen (Comparative Example 3), rice tsubo, water absorption rate, and water permeability were measured. The results are shown in Table 1.

[0028] The sanitary thin paper is made of hardwood kraft pulp (LBKP): softwood kraft pulp (NBKP) = 9: 1, and after making paper using pH 8.0 water for papermaking, 80 ° C It was dried for 120 seconds under the following temperature conditions.

[0029] [Table 1] Water repellent or addition amount US tsubo Water absorption speed Water penetration Size agent (%) (g / m ² ) (seconds) (sheets) Example 1 Shi "methyl monoalkylammoni

Umhalide 0.1 28.7 5.9 (0) 4 (0) Example 2 0.2 28.1 33.1 (○) 3 (0) Example 3 Alkyl ketenta, ima-0.02 29.6 3.6 (0) 6 (0) Example 4 〃 0.04 29.4 6.5 (0) 4 (0) Example 5 // 0.06 29.2 30.5 (0) 3 (0) Comparative example 1 // 0.005 29.8 2.9 (X) 7 (X) Comparative example 2 〃 0.01 28.8 3.1 (X) 7 ( X) Comparative Example 3 No addition 29.6 2.9 (X) 8 (X)

Claims

The scope of the claims

[1] A quaternary ammonium salt having an alkyl group and a Z or alkenyl group as a water repellent is contained in an amount of 0.02 to 0.5% by weight in terms of solid content based on the dry weight of the pulp slurry. Or a sizing agent in a solid content of 0.02 to 0.06% by weight with respect to the dry weight of the pulp slurry, and the water repellent or sizing agent is mixed in the norm slurry during paper making. A sanitary thin paper for household use.

[2] The household sanitary thin paper according to claim 1, having a water absorption rate of 3.5 to 35.0 seconds and a Z or water permeability of 6 sheets or less.

[3] The quaternary ammonium salt water-repellent agent having an alkyl group and a Z or alkenyl group is dimethyl monoalkyl ammonium halide or trimethyl monoalkyl ammonium halide. Household sanitary thin paper as described in Crab.

[4] 10 to 35 g / m ^{2 of} rice tsubo, paper thickness 0 to 200 m, dry tensile strength based on JIS P 8113 (longitudinal direction) 200 to 400 cN / 15 mm, (transverse direction) 60 to 200 cN / 15 mm The household sanitary thin paper according to any one of claims 1 to 3.