WO2006132149A1

WO2006132149A1 - Water-disintegrable sanitary paper

Info

Publication number: WO2006132149A1
Application number: PCT/JP2006/311097
Authority: WO
Inventors: Toshiki Yoshioka; Atsushi Konuma
Original assignee: Daio Paper Corporation
Priority date: 2005-06-06
Filing date: 2006-06-02
Publication date: 2006-12-14
Also published as: JP2006334326A; JP4533806B2

Abstract

[PROBLEMS] To provide a water-disintegrable sanitary paper which retains water-absorbing properties, prevents penetration to the back without fail, and can give a thick feeling and softness. Also provided is the water-disintegrable sanitary paper reduced in paper dust, which becomes more apt to generate with increasing softness. [MEANS FOR SOLVING PROBLEMS] The water-disintegrable sanitary paper comprises three or more layers, wherein the proportion of the water absorption time for at least one outer layer to the water absorption time for at least one layer other than the outer layers is from 1/15 to 1/1.5.

Description

Specification

Water-degradable sanitary paper

Technical field

The present invention relates to a water-decomposable sanitary paper such as a toilet paper sheet.

Background art

[0002] Since water-degradable sanitary paper such as toilet paper sheets directly touch the skin, consumers are required to have excellent functionality such as softness, softness, smoothness, and thickness. ing.

[0003] On the other hand, the performance required for toilet paper sheets is changing with the recent popularization of warm water toilet seats. In other words, the main purpose of using toilet paper sheets in toilet seats for hot water cleaning is to wipe off the water remaining on the body surface after cleaning, so the toilet paper sheets used in toilet seats for hot water cleaning are most required. Is water-absorbing. Therefore, conventionally, such toilet paper sheets have been required to absorb the entire amount of water remaining on the surface of the body, and the moisture absorbed in the sheets does not pass through and stick to the hand side. .

[0004] Therefore, there has been proposed a toilet paper sheet suitable for a warm-water-washing toilet seat that can improve water absorption by utilizing a gap generated by stacking sheets and perform a necessary function with one set of sheets. (For example, see Patent Document 1.) o

Patent Document 1: Japanese Patent Laid-Open No. 2002-172072

Disclosure of the invention

Problems to be solved by the invention

[0005] However, in the above invention, the water-decomposable sanitary paper is overlaid and the sanitary paper is embossed to increase the surface area, thereby securing water absorption between the sheets to absorb water. Strength that improves sexuality As the number of embossments increases, the softness and smoothness decrease, causing problems such as poor touch. In addition, since there is no consideration on the softness and slipperiness of the sanitary paper surface, there is a problem in use for the user who has a disease in the excretion part. [0006] Accordingly, a main object of the present invention is to provide a water-decomposable sanitary paper that can ensure water absorption, reliably prevent back-throwing, and provide a feeling of thickness and flexibility. Another problem is to provide a water-degradable sanitary paper that reduces paper dust that tends to be generated by softening.

Means for solving the problem

[0007] The invention according to claim 1 is a water-decomposable sanitary paper having three or more layers, wherein at least one outer layer has a water absorption time and at least one layer other than the outer layer has a water absorption time. It is a water-degradable sanitary paper characterized by a ratio of 1:15 to 1: 1.5.

[0008] In the invention according to claim ² , the basis weight of each layer is ll to 22 gZm ² , and the paper thickness of each layer is 60

The water-decomposable sanitary paper according to claim 1, which is -200 m.

[0009] The invention according to claim 3 is the hydrolytic solution according to claim 1 or 2, wherein the outer layer has a water absorption of 150 to 400 gZm ² , and at least one of the layers other than the outer layer has a water absorption of 100 to 300 gZm ^2. Sexual hygiene paper.

[0010] (Function and effect)

First, the outer layer absorbs water by giving a difference of 1:15 to 1: 1.5 as the ratio between the water absorption time of at least one outer layer and the water absorption time of at least one other layer other than the outer layer. After quickly trapping the moisture inside, the moisture can be diffused in a layer that has a slower water absorption time than the outer layer. Can be suitably achieved.

[0011] Further, the composition of the water-degradable sanitary paper is such that each layer has a basis weight of ll to 22 g / m ² , each layer has a paper thickness of 0 to 200 m, and the outer layer has a water absorption of 150 to 400 gZm ² . It is preferable that the water absorption of at least one of the layers other than is 100 to 300 gZm ² .

The invention according to claim 4 is the hydrolytic hygiene according to any one of claims 1 to 3, wherein the outer layer has a wet tensile strength [cNZ25mm] (JI SP 8113) in the longitudinal direction of 10 to 50. Paper.

[0013] (Function and effect)

The wet tensile strength [cNZ25mm] (jIS P 8113) in the longitudinal direction of the outer layer is set to 10-50, and the outer layer has a tensile strength that can withstand moisture wiping. It is possible to prevent such defects.

[0014] The invention according to claim 5 is the water-decomposable sanitary paper according to any one of claims 1 to 4, wherein the result of the looseness test specified in JIS P 4501 is 90 seconds or less. .

[0015] (Function and effect)

By configuring the result of the looseness test specified in JIS P 4501 to be 90 seconds or less, even if it is discarded in a flush toilet after use, it can quickly disintegrate and prevent clogging of the toilet. .

[0016] The invention according to claim 6 is such that when a plurality of sheets are horizontally stacked and lml of water is dropped onto the surface of the stacked sheets, the number of the permeated water drops is 10 or less. Item 6. The water-decomposable sanitary paper according to any one of items 1 to 5.

[0017] (Function and effect)

It is possible to suitably prevent moisture from getting through.

[0018] The invention according to claim 7 is the water-decomposable sanitary paper according to any one of claims 1 to 6, wherein a softening agent is added to the outer layer.

[0019] (Function and effect)

By adding a softening agent to the outer layer, the user who has a disease in the excretory part can wipe off the water without damaging the affected part.

[0020] The invention according to claim 8 is the shift 1 according to any one of claims 1 to 7, wherein a transient wet paper strength agent and Z or cationic starch are added to at least one of the layers other than the outer layer. It is a water-degradable sanitary paper as described in the section.

[0021] (Function and effect)

By adding a temporary wet paper strength agent and Z or cationic starch, the surface strength of at least one of the layers other than the outer layer is increased, so that the generation of paper dust can be suppressed.

[0022] The invention according to claim 9 is any one of claims 1 to 8, which is laminated embossed.

1. The water-decomposable sanitary paper described in item 1.

[0023] (Function and effect)

Laminate embossing can improve the water absorption by increasing the surface area while improving the feeling of thickness. The invention's effect

[0024] According to the water-decomposable sanitary paper of the present invention, it is possible to ensure water absorption, reliably prevent back-through, and give a sense of thickness and flexibility. In addition, paper dust that tends to be generated by softening can be reduced.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described.

〔Construction〕

The water-decomposable sanitary paper 10 according to the present invention has three or more layers as shown in FIGS. Here, it should be noted that the “layer” in the present invention does not mean a so-called “ply”. In other words, the water-decomposable sanitary paper 10 may be a single ply as shown in the illustrated example, for example, a multi-ply paper, but it may be a multi-ply of two, three, four, or more, although not shown. May be. At this time, each ply may be composed of a plurality of layers overlapping each other, or may be composed of each layer alone.

[0026] As shown in Fig. 1, the water-decomposable sanitary paper 10 according to the present invention has at least one layer other than one outer layer 11, and in the illustrated example, the middle layer 21 has a penetrating effect with a weak size effect. It is a slow liquid permeation suppression layer. As a result, when the outer layer is a liquid absorbing layer, penetration of moisture W absorbed (water absorption) into one outer layer 11 (for example, the surface layer) (missing into the other outer layer 12 (for example, the back layer)) is prevented. The problem of poor hygiene due to moisture getting on hands is solved. At this time, as shown in FIG. 2, the middle layers 21 and 21 may be a plurality of two or more layers, and all of them may be liquid permeation suppression layers. In this specification, the layers constituting both surfaces of the water-degradable sanitary paper 10 are expressed as outer layers 11 and 12, and the layers sandwiched between the outer layers 11 and 12 are all expressed as middle layers 21.

[Substrate raw materials, etc.]

In the water-decomposable sanitary paper according to the present invention, the raw material of the base paper is not particularly limited, and an appropriate raw material can be used. When pulp fiber is used as a raw material, the pulp fiber (raw pulp) is, for example, wood pulp, non-wood pulp, synthetic pulp, waste paper pulp, or the like, and more specifically, groundwood pulp (GP) , Stone Grand Pulp (SGP), Refiner Grand Pulp (RGP), Pressurized Ground Pulp (PGW), Thermomechanical Force Mechanical pulp (MP), chemical mechanical pulp (CGP), semi-chemical pulp (SCP), hardwood bleached kraft pulp LBKP), kraft pulp (KP) such as softwood bleached kraft pulp (NBK P), chemical pulp (CP) such as soda pulp (AP), sulfite pulp (SP), dissolved pulp (DP), nylon, rayon Synthetic pulp made from polyester, polybutyl alcohol (PVA), deinked pulp (DIP), waste paper pulp such as waist pulp (WP), ground pulp (TP), cotton, flax, hemp, jute, manila hemp, ramie 1 type or several types are appropriately selected from rag pulp, straw pulp, esbalt pulp, bagasse pulp, bamboo pulp, kenaf pulp and other auxiliary pulps such as bast pulp, etc. It is possible to use.

[0028] Raw materials such as pulp fibers are used as a base paper through, for example, a known papermaking process, specifically, a wire part, a press part, a dryer part, a size press, a calendar part, and the like. In this papermaking, for example, suitable chemicals such as a pH adjuster such as a dispersant, caustic soda, and aqueous ammonia, an antifoaming agent, an antiseptic, a fluorescent dye, a mold release agent, a water resistant agent, a flow modifier, and a yield improver. Can be added.

[0029] However, it is preferable that at least one of cellulose, hemicellulose, hydrophilic acetate cellulose, and hydrophilic nonwoven fabric is used as a raw material for the liquid absorbing layer! /.

[0030] On the other hand, it is preferable that at least one of the liquid, the water-repellent nonwoven fabric, and the acetate cellulose is used as a raw material for the liquid permeation suppression layer. However, even when the liquid permeation suppression layer is made of norp fiber, it is preferable that the sizing agent contains 0.02 to 0.06% by mass of the solid content to the absolute dry mass of the pulp! It is more preferable to include 0.03 to 0.05%! If the blending capacity of the sizing agent is less than 0.02% by mass, it will not be possible to sufficiently reduce the penetration of the liquid. On the other hand, when the amount of the sizing agent exceeds 0.06% by mass, there arises a problem that the water repellency becomes too strong.

[0031] As the sizing agent, for example, a neutral sizing agent such as alkyl ketene dimer, alkaryl succinic anhydride, and water-free stearic acid, and an acidic sizing agent such as saponified natural rosin and reinforced rosin can be used. it can.

[0032] [Water absorption time] The water absorption time of the water-decomposable sanitary paper in the present invention is measured by the following method under the conditions of JIS P8111. Specifically, the sample sheet is first placed on the cup mouth, and the periphery of the sample is fixed to the cup mouth with a rubber band. Next, use a dropper to drop water on a drop (5 μ 1) from a height of 1 cm on the sample and measure the time from when the drop falls and the force is completely sucked into the sample with a stopwatch. Water absorption time (second Z1 drop). Here, when it is determined that the light is no longer reflected when the water droplet is viewed from an oblique direction (at an inclination of 45 degrees with respect to the vertical) instead of directly above, it is determined that the sample has been completely absorbed into the sample. And

[0033] Based on this, the ratio of the water absorption time when the outer layer and the middle layer are measured independently is 1

: 15 to 1: 1.5 is preferable. On the other hand, if the water absorption time of the outer layer is 1, and the water absorption time of the middle layer is more than 15, water absorption in the middle layer cannot catch up, and diffusion is mainly performed, and moisture remains on the surface of the middle layer. In addition, since it returns to the outer layer, it becomes insufficient to ensure water absorption. On the other hand, if the water absorption time of the outer layer is 1, and the water absorption time of the middle layer is less than 1.5, the moisture permeates in the vertical direction quickly, and the water penetrates into the other outer layer, resulting in a breakthrough. There is a fear.

[0034] [Water absorption]

It is preferable that the water absorption amount of the outer layer as the liquid absorption layer is 150 to 400 gZm ² . This is because if it is less than 15 OgZm ² , moisture remains in the outer layer, which is insufficient to ensure water absorption. In addition, if it exceeds 400 gZm ² , it is excellent in securing water absorption because the pressure of the hand during use may cause the water to return.

[0035] liquid water absorption of middle a permeation suppressing layer is preferably a 100~300gZm ^2. This is because if it is less than 150 gZm ² , moisture remains in the outer layer, which is insufficient to ensure water absorption. In addition, if it exceeds 300 g / m ² , it is excellent in securing water absorption, but moisture may be reversed due to hand pressure during use.

[0036] [Basis weight]

The basis weight of each layer of the toilet paper in the water-decomposable sanitary paper according to the present invention is preferably ll to 22 gZm ² in the basis weight measurement method of JIS P 8124. Because it is less than l lg Zm ² , although it is preferable from the viewpoint of improving the softness of toilet paper, This is because the strength of the let paper cannot be ensured properly. In addition, if it exceeds 22 g Zm ² , the toilet paper becomes too hard and the touch of the toilet paper deteriorates.

[0037] [Paper thickness]

The paper thickness of each layer is preferably 60 to 200 m. This is because if it is less than 60 m, it is preferable from the viewpoint of improving the softness of the toilet paper, but the strength of the toilet paper cannot be ensured properly. In addition, at 200 / zm or more, not only does the paper become too hard, but the touch of the toilet paper deteriorates.

This is because there is a feeling of harshness during use.

[0038] The paper thickness is measured using a dial thickness gauge (thickness measuring instrument) rpEACOCK G type (manufactured by Ozaki Seisakusho) under the conditions of JIS P8111. Specifically, after confirming that there is no dust, dust, etc. between the plunger and the measuring table, lower the plunger on the measuring table, move the dial thickness gauge memory to set the zero point, and then Then, raise the plunger and place the sample (toilet paper) on the test table, slowly lower the plunger and read the gauge at that time. At this time, just put the plunger. The paper thickness is the average value obtained from 10 measurements.

[0039] [Tensile strength]

The toilet paper sheet in the water-decomposable sanitary paper according to the present invention is obtained by adding a predetermined amount of wet paper strength enhancer in the manufacturing process of the toilet paper. Here, in the tensile test method of JIS P 8113, it is preferable that the tensile strength [cNZ25mm] (wet paper strength) of the toilet paper in the wet state is 10 to 50. This is because if it is less than 10, sanitary paper is torn during the application of glue (eg, water-based glue) during processing, making it difficult to properly apply glue. On the other hand, if it exceeds 50, the product value will decrease due to poor water disintegration. Therefore, by setting the wet tensile strength [cNZ25mm] in the longitudinal direction of the toilet paper to 10 to 50, it is possible to provide toilet paper in which paper strength in a wet state is appropriately secured. [0040] Note that, as a method for measuring the tensile strength, in JIS P 8113, for example, there is a method in which the toilet paper is wetted using a predetermined moisture applying means such as a brush.

[0041] Examples of the wet paper strength enhancer to be added include polyamide polyamine epichlorohydrin resin, urea formaldehyde resin, melamine formaldehyde resin, and the like.

[0042] In addition, it is preferable to add a temporary wet paper strength agent and / or a cationic starch to at least! /, Any of the layers other than the outer layer at the paper-making stage. 8. It is desirable to add Okg / ton (pulpton). On the other hand, if it exceeds 8. OkgZ tons (pulp tons), the paper strength is too strong, which becomes an impediment to water disintegration when discarded in a flush toilet after use. On the other hand, if the amount is less than 0.5 kgZ ton (pulp ton), the surface strength is poor, and the cell mouth fiber protruding with surface force is fluffed, and as a result, paper dust that is a lump of cellulose fiber is likely to be generated.

[0043] [Water degradability]

As for the water decomposability of the toilet paper in the water-decomposable sanitary paper according to the present invention, the result of the test method for ease of loosening defined by JIS P 4501 is preferably 90 seconds or less. If it is longer than 90 seconds, even if it is discarded in the flush toilet after use, it may become clogged in the toilet, which is slow to disintegrate.

[0044] [Moisture penetration]

Toilet paper has a water penetration rate of 10 sheets of toilet paper sheets with the above structure stacked horizontally (ply), and when lml of water is dropped onto the surface of the stacked sheets, the number of sheets to which the dropped water penetrates is 10 It is preferable that the number is not more than 1.

[0045] Here, as a specific method for measuring the moisture penetration, one set of three-ply toilet paper is sequentially stacked, and at least 10 sets of stacked samples are prepared. Place this sample on a horizontal platform. Next, lml of water is sucked with a spoid, and lml of water is dropped from such a height that the tip of the spoid does not touch the sample surface. After confirming that water is completely absorbed by the sample, the number of layers wetted by water is counted up.

[0046] The reason why the number of water permeation was set to 10 or less was to prove experimentally the degree of water penetration in actual use based on the ratio of absorption time described above. Beyond This is because the ratio substantially deviates from the ratio of the absorption time.

[0047] [Softness]

The softness (JIS L1096 bending synthesis) of the toilet paper sheet in the water-decomposable sanitary paper according to the present invention is preferably 1.5 to 3.5 g. This is because if it is less than 1.5 g, the toilet paper becomes too soft and it is difficult to secure a sense of thickness. Also, if it exceeds 3.5g, the toilet paper becomes too hard and the touch is bad.

[0048] Here, softness is a resistance value (average value in length and width) when a 10 cm width sanitary thin paper is pushed into a gap of 5. Omm wide by a terminal. The smaller the value, the softer the softness. Means. In this specification, softness refers to a value measured by the handleometer method (JIS L-1096 E method). The softness can be adjusted, for example, by changing the basis weight, the number of layers, the type of fiber 'film forming the layers, the fusing process conditions, and the like.

[0049] [Softener]

For the water-decomposable sanitary paper according to the present invention, it is preferable to add a softening agent to the outer layer. Examples of softeners are surfactant-based softeners, and examples of softeners include cationic surfactants, nonionic surfactants, cationic surfactants, and zwitterionic surfactants. It can be used by appropriately selecting from these forces.

[0050] As the cation-based surfactant, carboxylate-based, sulfonate-based, sulfate ester-based, phosphate ester salt-based and the like can be used. In particular, alkyl phosphate ester salts are preferred.

[0051] Nonionic surfactants include polyhydric alcohol compounds such as sorbitan fatty acid esters, diethylene glycol monostearate, diethylene glycol monosoleate, glyceryl monostearate, glyceryl monostearate, and propylene glycol monostearate. Fatty acid ester, N- (3-oleirosikey 2-hydroxypropyl) diethanolamine, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbite dense wax, polyoxyethylene sonolebitane sesquistearate, polyoxyethylene monooleate, polyoxyethylene Monolaurate, polyoxyethylene cetyl ether, polyoxyethylene lauryl ether and the like can be used. [0052] As the cationic surfactant, a quaternary ammonium salt, an amine salt, an amine, or the like can be used. Examples of zwitterionic surfactants include aliphatic derivatives of secondary or tertiary amines containing carboxy, sulfonate, sulfate, or aliphatic derivatives of heterocyclic secondary or tertiary amines. Can be used.

[0053] As the softener of the present invention, it is desirable to use a cationic surfactant. As the thione-based surfactant, a quaternary ammonium salt, an amine salt, or an amine can be used. In addition, as the zwitterionic surfactant, a secondary or tertiary amine amine derivative containing carboxy, sulfonate, sulfate, or a heterocyclic secondary or tertiary amine amine derivative is used. be able to.

[0054] These softeners may be added to the sheet either internally or externally. In addition, secondary additives such as anionic surfactants, fragrances, coloring agents, preservatives, and anti-oxidation agents can be added to the chemical solution in a proportion of 1% or less.

[0055] By adding a softening agent, the softness and smoothness of the surface are expressed, and the touch is improved. In particular, a user who has a disease in the excretory part can suitably wipe off moisture without damaging the affected part.

[0056] [Embossing]

In the water-degradable sanitary paper of the present embodiment, when it is at least 2 plies and each sheet is embossed and overlapped, it can improve the sense of thickness and increase the surface area to improve water absorption. It is possible and preferable. More preferably, laminate embossing is desired.

Example

[0057] An example of the water-decomposable sanitary paper according to the present invention was compared with Comparative Examples 1 to 3.

The amount of water absorption (gZm ² ) in Tables 1 and 2 is the surplus by immersing one pair of products that have been pre-weighed and cut to 10 cm x 10 cm in water, and if the water has completely penetrated the entire surface, gently increase the water surface force. This refers to the increase in weight measured by shaking off the moisture.

[0058] Compared with Comparative Examples 1 to 3, the examples of the water-decomposable sanitary paper according to the present invention ensure water absorption, reliably prevent back-throwing, and give a sense of thickness and flexibility. I knew I could do it. Moreover, paper dust was able to be reduced.

¾005

Industrial applicability

[0061] The present invention is applicable as a water-decomposable sanitary paper such as a toilet paper sheet.

Brief Description of Drawings

[0062] Fig. 1 is a schematic cross-sectional view of water-degradable sanitary paper (three layers). FIG. 2 is a schematic cross-sectional view of water-degradable sanitary paper (four layers).

Explanation of symbols

10 ··· Water-degradable sanitary paper, 11, 12 ··· Outer layer, 21 ··· Middle layer, W… Liquid,

Claims

The scope of the claims

[1] Water-degradable sanitary paper made into three or more layers,

The ratio between the water absorption time of at least one outer layer and the water absorption time of at least other layers other than the outer layer is 1:15 to 1: 1.5.

Water-degradable sanitary paper characterized by that.

[2] The water-decomposable sanitary paper according to claim 1, wherein the weight of each layer is ll to 22 gZm ² and the thickness of each layer is 60 to 200 μm.

[3] The water-decomposable sanitary paper according to claim 1 or 2, wherein the outer layer has a water absorption of 150 to 400 gZm ² , and at least one of the layers other than the outer layer has a water absorption of 100 to 300 gZm ² .

[4] The water-decomposable sanitary paper according to any one of claims 1 to 3, which has a wet tensile strength [cNZ25mm] (jIS P 8113) of 10 to 50 in the longitudinal direction of the outer layer.

[5] The result of the looseness test specified in JIS P 4501 is 90 seconds or less.

The water-decomposable sanitary paper according to any one of 1 to 4.

[6] The sheet according to any one of claims 1 to 5, wherein when a plurality of sheets are stacked horizontally and lml of water is dropped on the surface of the stacked sheets, the number of the permeated water is 10 or less. 1. Water-decomposable sanitary paper as described in item 1.

[7] The hydrolyzable sanitary paper according to any one of claims 1 to 6, wherein a softening agent is added to the outer layer.

[8] The water-decomposable sanitary paper according to any one of claims 1 to 7, wherein a temporary wet paper strength agent and Z or cation starch are added to at least one of the layers other than the outer layer.

[9] The water-decomposable sanitary paper according to any one of claims 1 to 8, which is laminated and embossed.