JP2002045323A - Cleaning wet sheet - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a cleaning wet sheet which is used for cleaning a hard surface such as a house or a car and for cleaning a body and which has excellent cleaning durability. SOLUTION: The cleaning wet sheet in which a low-flow aqueous liquid is held and a surface layer serving as a cleaning surface is liquid-permeable, and the cleaning wet sheet in an expanded state is heated at 20 ° C. A cleaning wet sheet having a reduction rate of the aqueous liquid of 40% by weight or less after hanging for 120 minutes in an environment of 65% RH;

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning wet sheet capable of holding a large amount of aqueous liquid, and releasing the aqueous liquid gradually to wipe a wide surface to be cleaned.

[0002]

2. Description of the Related Art
2. Description of the Related Art A wet type cleaning sheet impregnated with an aqueous cleaning agent has been known for the purpose of cleaning a hard surface of a house or a car or cleaning a body. However, since the cleaning agent impregnated in these cleaning sheets is mainly composed of water, if the cleaning sheets are left for a certain period of time, they are dried and cannot be used. In particular, when cleaning the interior of a house, the floor, walls, shells, glass, and other areas to be cleaned are wide, and at present, only a small portion can be cleaned using a conventional cleaning sheet.
Also, in cleaning automobiles and the like, it takes about 10 minutes to wipe off the whole, and the sheet often dries during that time.

Accordingly, an object of the present invention is to provide a cleaning wet sheet which is used for cleaning a hard surface such as a house or a car and for cleaning a body and has excellent cleaning durability. Further, the present invention is used by being attached to a mop-shaped cleaning tool.
An object of the present invention is to provide a cleaning wet sheet that can remove light stains and dust on the floor without wiping it.

[0004]

SUMMARY OF THE INVENTION The present invention provides a cleaning wet sheet in which an aqueous liquid having a low fluidity is retained and a surface layer serving as a cleaning surface is liquid-permeable. The object is achieved by providing a cleaning wet sheet in which the rate of reduction of the aqueous liquid after suspending the cleaning wet sheet in an environment of 20 ° C. and 65% RH for 120 minutes is 40% by weight or less. It was done.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. FIG. 1 is a schematic perspective view of a first embodiment of a cleaning wet sheet (hereinafter, simply referred to as a wet sheet) of the present invention.

[0006] The wet sheet 1 of the present embodiment comprises an inner layer 2
And a pair of outer layers 3 and 4 sandwiching this from above and below. The outer layers 3 and 4 are layers located on the surface of the wet sheet 1 and serve as cleaning surfaces during use. The inner layer 2 holds a low-fluidity aqueous liquid described below.

The wet sheet 1 is spread at 20 ° C.
The reduction rate of the aqueous liquid after hanging for 120 minutes in an environment of 65% RH is 40% by weight or less. This reduction rate is most preferably 0, but drying of the wet sheet 1 due to volatilization of water is not more than 40% by weight.
The present inventors have found that the effect of the wet sheet 1 on the cleaning performance is greatly different. In order to further improve the cleaning performance, the reduction rate is preferably 30% by weight or less, particularly preferably 20% by weight or less.

[0008] It takes a lot of time to clean hard surfaces such as floors, walls, furniture, glass, etc. in a house, and in some cases there are sudden visitors or telephone calls, so that cleaning is sometimes interrupted. is there. However, if the cleaning performance can be maintained for about 120 minutes, a wide range of cleaning can be completed even in such a case.

[0009] The reduction rate is measured by the following method.
First, the weight (A) of the aqueous liquid contained in the wet sheet 1 and the initial weight (B) of the wet sheet 1 are measured with a balance. Next, as shown in FIG. 4, the wet sheet 1 is spread in a plane and suspended for 120 minutes in an environment of 20 ° C. and 65% RH (1 atm), and then the weight (C) of the wet sheet 1 is measured. The reduction rate (%) is (B
−C) / A × 100. When suspending the wet sheet 1, use a 25 mm wide clamp C
[Kokuyo Double Clip (trade name)] holds both ends of the short side of the wet sheet 1. The holding area of each clamp C is 125 mm ² .

In order for the reduction rate of the aqueous liquid in the wet sheet 1 to be within the above range, the aqueous liquid needs to have low fluidity. Although it is possible to maintain the aqueous liquid without lowering the fluidity and reduce the reduction rate to 40% by weight or less, in that case, a large amount of the aqueous liquid migrates to the surface to be cleaned during cleaning, Dirt cannot be absorbed, resulting in poor finish. Further, when the surface to be cleaned is a wood-based material or a tatami mat, these may be damaged. In order to avoid these disadvantages more effectively, the aqueous liquid is preferably in a thickened state or a gel state.

The aqueous liquid is a low-fluid liquid mainly composed of water and containing a component that makes the aqueous liquid low-fluid (this component will be described later). The aqueous liquid preferably contains water in an amount of 60% by weight or more, particularly 70% by weight or more, from the viewpoint of good cleaning performance and finish. The upper limit of the water content is
Although it depends on the type of the component for lowering the fluidity of the aqueous liquid, it is about 99% by weight, especially about 95% by weight.

When the aqueous liquid is made to have a low viscosity by making it thicker, the aqueous liquid contains a thickener. Examples of the thickener include natural polysaccharides, semi-synthetic organic polymers such as celluloses and starches, vinyl polymers such as acrylic acid polymers and polyvinyl alcohol, and synthetic organic polymers such as polyethylene oxide, and clay minerals. Of water-soluble inorganic polymers. In particular, it is preferable to use an acrylic acid polymer such as polyacrylic acid or [acrylic acid-alkyl methacrylate] copolymer because of low stickiness and slimy feeling. It is preferable that these acrylic acid polymers are used in the form of a sodium salt in that the aqueous liquid can be thickened with a smaller amount.

The amount of the thickener in the aqueous liquid is from 0.2 to 5
It is preferable that the content is 0.5% by weight, particularly 0.5 to 3% by weight, from the viewpoints of improvement in cleanability and prevention of evaporation of water.

The aqueous liquid which has been fluidized with a thickener is
Its viscosity is 10,000 to 1,000,
000 mPa · s, especially 30,000 to 500,000
It is preferably mPa · s. By setting the viscosity of the aqueous liquid within the above range, a large amount of the aqueous liquid is prevented from migrating to the surface to be cleaned at one time at the time of cleaning, and the aqueous liquid gradually moves to the surface to be cleaned, thereby cleaning a wide area. The target surface can be cleaned, and dirt and dust adhering lightly to the surface to be cleaned are efficiently adsorbed and removed by wetting with the aqueous liquid. In addition, since the rate of volatilization of the aqueous liquid becomes extremely slow, the reduction rate can be greatly reduced even if the aqueous liquid is left for about 120 minutes. Further, since the aqueous liquid hardly remains on the surface to be cleaned, a part of dirt and dust does not remain on the surface to be cleaned, and the finish is good. Moreover, cleaning wood-based materials and tatami mats has little adverse effect on them.

The viscosity is measured using a Brookfield viscometer. The rotor used and the number of rotations are appropriately changed according to the viscosity of the aqueous liquid.

In the case where the aqueous liquid is made to be in a gel state to lower the fluidity, the aqueous liquid contains a gelling agent. Also in this case, as in the case of using the thickener described above, the amount of the aqueous liquid that migrates to the surface to be cleaned is extremely small, and the evaporation rate is extremely low. In addition, dirt, dust, and the like lightly adhering to the surface to be cleaned are efficiently adsorbed and removed by wetting with the aqueous liquid. Further, the finish is good. Moreover, cleaning wood-based materials and tatami mats has little adverse effect on them. When the aqueous liquid is in a gel state, its viscosity may not be measured, unlike the above-mentioned thickened state.

The gelling agent is not particularly limited as long as it absorbs moisture to cause gelation. For example, a gelling agent that causes gelation by forming various crosslinked structures can be used. Examples of such gelling agents include natural polysaccharides such as pectic acid having a high methoxyl degree, sodium alginate, carrageenan, curdlan, gellan gum, xanthan gum, gelatin, ovalbumin, proteins such as serum albumin, carboxymethylcellulose and sodium polyacrylate. And the like. In addition, a highly water-absorbing resin used in sanitary products is also preferably used. As the superabsorbent resin, it is preferable to use a resin having a water absorption capacity of 10 to 300 times, particularly 50 to 200 times its own weight, from the viewpoint of improving cleanability and reducing the amount of water vaporized.

As such a superabsorbent resin, a natural product derived from a crosslinked product such as hydroxyethyl cellulose, starch, carboxymethyl cellulose, alginic acid (salt), hyaluronic acid (salt), polyglutamic acid (salt), chitosan, polylysine, etc. Is mentioned. In a chemically synthesized product, a nonionic crosslinked product such as polyvinyl alcohol, polyacrylamide, polyvinylpyrrolidone, polyhydroxyethyl acrylate, polyvinyl methyl ether, polyethylene glycol, and polydioxolane; a polyacrylic acid (salt) as an anionic one; ), Poly [isobutylene-maleic acid (salt)], poly [2-acrylamido-2-methylpropane-sulfonic acid (salt)], poly [acryloxypropanesulfonic acid (salt)], polyvinylphosphonic acid (salt), etc. Crosslinked products such as poly [methacryloyloxyethyl quaternary ammonium chloride], polyvinylpyridine, polyethyleneimine, etc .; betaine-based products such as N, N-dimethyl-N- (3 -Acrylamidopropyl) -N Crosslinked product such (carboxymethyl) ammonium salts. Further, a [starch-acrylic acid (salt)] graft copolymer, a saponified [starch-acrylonitrile] copolymer, an acrylic acid (salt) copolymer and the like can be mentioned. Further, these fibrous materials can also be used.

In the aqueous liquid, in addition to the above-mentioned components (thickener and gelling agent) for lowering the aqueous liquid, a surfactant, a water-soluble solvent, an alkali agent, an acid, a chelating agent, a polishing agent ,
A wax agent, a disinfectant, a preservative, a metal salt, a fragrance, a pigment, and the like can be contained.

As the surfactant, any of anionic surfactants, nonionic surfactants, cationic surfactants and amphoteric surfactants are used. Particularly, from the viewpoint of compatibility between detergency and finish, Polyoxyalkylene (alkylene oxide addition mole number 1 to 20) alkyl (C8 to
22 straight-chain or branched-chain) ethers, alkyls (8 carbon atoms)
To 22 straight-chain or branched-chain) glycosides (average sugar condensation degree 1)
5) Nonionic activators such as sorbitan fatty acid (linear or branched chain having 8 to 22 carbon atoms) ester and alkyl (linear or branched chain having 6 to 22 carbon atoms), alkyl carboxy betaine, alkyl sulfo Amphoteric surfactants having 8 to 24 alkyl carbon atoms such as betaine, alkylhydroxysulfobetaine, alkylamidocarboxybetaine, alkylamidosulfobetaine, and alkylamidohydroxysulfobetaine are preferably used. The surfactant is 0.01 to 5% by weight in the aqueous liquid,
In particular, the content of 0.05 to 2% by weight is preferable from the viewpoint of cleanability and finishability.

As the water-soluble solvent, at least one selected from monohydric alcohols, polyhydric alcohols and derivatives thereof is preferable, and particularly, from the viewpoint of finishability, the vapor pressure is 2 mm.
Hg or more is preferable. For example, ethanol, isopropyl alcohol, propanol, ethylene glycol monomethyl ether, propylene glycol monomethyl ether and the like are preferable. The water-soluble solvent is preferably contained in the aqueous detergent in an amount of 1 to 40% by weight, particularly 1 to 20% by weight, from the viewpoint of reducing odor and skin irritation.

Examples of the alkaline agent include hydroxides such as sodium hydroxide, carbonates such as sodium carbonate, alkaline sulfates such as sodium hydrogen sulfate, phosphates such as monobasic sodium phosphate, sodium acetate, and succinic acid. Organic alkali metal salts such as sodium, ammonia, alkanolamines such as mono, di or triethanolamine, β-aminoalkanols such as 2-amino-2-methyl-1-propanol, and morpholine. Especially feel and p
In terms of the buffering properties of H, alkanolamines such as mono, di or triethanolamine, 2-amino-2-methyl-1
Β-aminoalkanols such as -propanol and morpholine are preferred. The alkali agent is 0.01 to 5% by weight,
In particular, it is preferable to contain 0.05 to 1% by weight in terms of detergency and feel.

When a metal salt is used in combination with an ionic thickener or a gelling agent, the amount of the aqueous liquid released to the surface to be cleaned is controlled by the difference in osmotic pressure. The metal salt is not particularly limited as long as it is water-soluble. Examples thereof include inorganic metal salts such as sodium salt, potassium salt, calcium salt, magnesium salt and zinc salt, and organic acid metal salts such as sodium citrate.

Also by the addition of an acid, the amount of the aqueous liquid released to the surface to be cleaned is controlled by the deionization of the thickener and the gelling agent. Examples of the acid include organic acids such as citric acid.

When a chelating agent is used in combination with a gelling agent which gels by interaction with a metal ion,
The gel state of the aqueous liquid is controlled, and a desired amount of the aqueous liquid is released to the surface to be cleaned.

The aqueous liquid is held uniformly or in a pattern (continuous or discontinuous) on the support sheet constituting the inner layer 2. The aqueous liquid, when held on the support sheet, may or may not be used, and may be contained in an amount of 5 to 100 per wet sheet.
g, especially 20 to 60 g, is preferable in terms of cleaning performance, usability during cleaning, and economic efficiency. For the same reason, 150-3000 g /
m ² , particularly preferably 600 to 1800 g / m ² .

The wet sheet 1 has a basis weight of 40 to 200 g / m ² before the aqueous liquid is held,
In particular 50 to 150 g / m ² , especially 60 to 130 g /
m ² is preferred. When the grammage is within this range, a sufficient amount of aqueous liquid can be held for cleaning a wide-area surface to be cleaned, and operability during cleaning due to an increase in weight is unlikely to occur.

The outer layers 3 and 4 of the wet sheet 1 are
It is liquid-permeable and porous from the viewpoint of adsorbing light stains and dust on the surface to be cleaned to the surface by wetting with an aqueous liquid. Thus, when the wet sheet 1 is used, the low-fluid aqueous liquid held in the inner layer 2 can come into contact with dirt and dust on the surface to be cleaned.

As the outer layers 3 and 4, for example, paper, wet and dry nonwoven fabrics, fiber aggregates such as woven and knitted fabrics, and sheet materials such as films having a large number of apertures can be used. Also, these laminated sheet materials can be used. The constituent materials of the outer layers 3 and 4 may be the same or different. If you want to improve the entanglement of hair and dust when cleaning the wet sheet 1,
The outer layers 3 and 4 have a fiber length of 20 mm or more, especially 30 to 1
It is preferable to use a low-entangled nonwoven fabric composed of fibers of 00 mm, especially 35 to 65 mm. Such low entangled nonwoven fabrics include spunlaced nonwoven fabrics, thermal bond nonwoven fabrics such as air through, spunbonded nonwoven fabrics,
Three-dimensional brushed nonwoven fabric and the like can be mentioned. In this case, the fiber length is 20
The low entangled nonwoven fabric composed of fibers of not less than 20 mm does not require that all the constituent fibers have a fiber length of not less than 20 mm, and is inevitably mixed into the raw material of the nonwoven fabric and / or in the production process. It is permissible to include fibers that have a fiber length of less than 20 mm. In the present embodiment, the outer layers 3 and 4 correspond to the surface layer. However, when the wet sheet of the present invention has a single-layer structure, the surface layer in the wet sheet refers to the surface of the wet sheet. And a region in the vicinity thereof.

As shown in FIG. 1, the outer layers 3 and 4 are embossed, and the surface is divided into a number of convex portions 5, 4,. And the like. The embossing pattern has a rhombic lattice shape, the protrusions 5 have a rhombus shape, and the recesses 6 have a linear shape. The concave portion 6 is made more compact than the convex portion 5 by applying pressure (and heat used as necessary) by embossing. By performing such embossing on the outer layers 3 and 4, even when a large amount of aqueous liquid is held, the integrity of the wet sheet 1 as a laminate is maintained, and the operability of the wet sheet 1 during cleaning is maintained. Is kept.

The pattern of the concave portion 6 formed by embossing is not limited to the case shown in FIG. 1, but may be a curved shape or a combination of a straight shape and a curved shape. In particular, a pattern in which continuous linear concave portions cross each other to form closed convex portions by the concave portions is preferable from the viewpoint of maintaining the surface strength of the wet sheet 1. The width of the recess 6 is 0.8 to 3 mm,
It is preferable from the viewpoint of achieving both cleanability and operability.

As the embossing pattern, a combination of a continuous linear pattern and a discontinuous dot pattern is preferably used.

When the outer layers 3 and 4 are made of a fiber assembly, it is preferable that the fibers constituting the fiber assembly have an appropriate hydrophilicity from the viewpoint of collecting dust and dirt. Examples of such hydrophilic fibers include cellulosic fibers, for example, natural fibers such as wood pulp, cotton, and hemp, and cellulosic chemical fibers such as viscose rayon, Tencel, and acetate. Further, a fiber made hydrophilic by treating the surface of a hydrophobic synthetic fiber with hydrophilicity can also be used. There is no particular limitation on the fiber diameter of these fibers, but 0.1 to 3.
It is preferably 3 dtex, particularly preferably 0.5 to 2 dtex, from the viewpoint of entanglement of hair and dust.

The outer layers 3 and 4 facilitate the contact of the aqueous liquid held by the inner layer 2 with dirt on the surface to be cleaned during cleaning, ensure sufficient strength for the surface to be cleaned, and provide cleaning. From the point of gradually releasing a sufficient amount of aqueous liquid,
Its basis weight is preferably 5 to 70 g / m ² , particularly preferably 15 to 50 g / m ² . Further, the thickness is preferably 0.05 to 5 mm, and more preferably 0.1 to 2 mm, from the viewpoint of achieving both the property of collecting hair and cotton dust and the property of cleaning dirt with an aqueous liquid.
Is more preferable, and 0.2 to 1 mm is more preferable.

The inner layer 2 is a layer having an aqueous liquid having low fluidity. The inner layer 2 may be constituted by the aqueous liquid itself, or may be constituted by holding the aqueous liquid on a predetermined carrier. When the aqueous liquid is held on a predetermined support sheet to form the inner layer 2, as the support sheet, a fiber aggregate such as a nonwoven fabric, a woven fabric, or a knitted fabric, or a porous body such as a sponge may be used. it can. In particular, it is preferable to use a porous and bulky sheet material having a cushioning property (compression recovery property) as the supporting sheet, since it can hold a large amount of the aqueous liquid. Examples of the support sheet having such characteristics include a thermal bond nonwoven fabric such as an air through, a spunlace nonwoven fabric, and an airlaid nonwoven fabric. Also, a part of the outer layers 3 and 4 in the thickness direction,
Specifically, a part of the outer layers 3 and 4 in the thickness direction on the facing surface side may also serve as the support sheet.

When the supporting sheet is made of a fiber aggregate, the constituent fibers are rayon, cotton,
A hydrophilic fiber such as pulp or polyvinyl alcohol fiber can be used. It is also preferable to use a hydrophobic fiber from the viewpoint of increasing the thickness of the inner layer 2 in a state where the aqueous liquid is held and improving the cushioning property. Examples of the hydrophobic fiber include polyolefin fibers such as polyethylene and polypropylene, polyester fibers, polyamide fibers such as nylon, polyacrylonitrile fibers, and the like, and core-sheath fibers and side-by-side fibers containing these substances as constituents. Conjugate fiber. Further, from the viewpoint of further increasing the thickness of the inner layer 2 and further enhancing the cushioning property, it is also preferable to use a three-dimensionally crimped form of these fibers. The above-mentioned hydrophilic fiber and hydrophobic fiber can be mixed and used.

When the supporting sheet is made of a fiber aggregate, the fiber diameter of the constituent fibers is preferably 1 to 10 dtex from the viewpoint of increasing the thickness of the inner layer 2 and the cushioning property. The fiber length of the fiber is not particularly limited, and either a long fiber filament or a short fiber stable fiber can be used.

The basis weight of the supporting sheet is 15 to 150 g / m
² , particularly 25 to 80 g / m ² , is preferable in terms of enhancing the thickness and cushioning property of the inner layer 2 and satisfying a price that is not resistant to disposable use. For similar reasons,
The thickness of the supporting sheet is 0.5 to 20 mm, particularly 1 to 5 mm
It is preferred that

As a method for supporting the aqueous liquid on the supporting sheet, a method such as coating or pouring can be used.

The wet sheet 1 of this embodiment is preferably manufactured by, for example, the following method. After the aqueous liquid is held on the carrier sheet constituting the inner layer 2 by the above-described method, the sheet material constituting the outer layer 3 is disposed on both surfaces of the carrier sheet. Then, the three members are integrated by embossing or heat sealing. Alternatively, a web formed by a card method is superimposed on one side of a support sheet such as a thermal bond nonwoven fabric constituting the inner layer 2, and the two are entangled (water needling) by a high-pressure water flow, and the web is entangled. A spun lace nonwoven fabric is manufactured in which the carrier sheet and the web are integrated in an entangled state.
Next, the aqueous liquid is carried on the carrying sheet, and the sheet material constituting the other outer layer 4 is overlaid thereon, and then the three members are integrated by embossing or heat sealing.

The wet sheet 1 produced by such a method preferably has a breaking strength of 200 cN / 25 mm or more, particularly 400 cN / 25 mm or more, in terms of sheet strength required for cleaning. More preferred.

Since both the outer layers 3 and 4 of the wet sheet 1 of the present embodiment are water-permeable, both surfaces can be cleaned when used. Then, when the surface to be cleaned is cleaned using the wet sheet 1 of the present embodiment, the cleaning can be performed for a long time because the evaporation of water is small. Since the aqueous liquid is gradually released, a wide area can be cleaned. Then, dirt, dust, and the like lightly attached to the surface to be cleaned are efficiently adsorbed and removed by wetting with the aqueous liquid. Furthermore, the finish is good. Moreover, cleaning wood-based materials and tatami mats has little adverse effect on them.

The wet sheet 1 according to the present embodiment includes a house,
For example, it is suitably used for cleaning hard surfaces of floors, walls, ceilings, living furniture, bathtubs, wash basins, cars, and the like made of flooring, vinyl (cushion floor), tiles, and the like, and body cleaning. Also, since a small amount of aqueous liquid is gradually released,
Tatami, which had to be cleaned with a wet rag that had been squeezed before, can be easily cleaned.

Next, a second embodiment of the wet sheet according to the present invention will be described with reference to FIGS. still,
For the second embodiment, only the points different from the first embodiment will be described, and for the same points, the detailed description of the first embodiment will be applied as appropriate. 2 and 3, the same members as those in FIG. 1 are denoted by the same reference numerals.

FIGS. 2 and 3 show a wet sheet 1 which is attached to the cleaning portion of a cleaning tool having a cleaning portion and a rod-shaped handle connected to the cleaning portion and is preferably used for cleaning a floor. An embodiment is shown.

The wet sheet of this embodiment is composed of a laminated body in which an inner layer 2 holding an aqueous liquid having low fluidity and a pair of outer layers 3 and 4 sandwiching the inner layer 2 from above and below. I have. As the outer layer 3 which is one of the outer layers 3 and 4, a liquid-impermeable sheet material is used. As the other outer layer 4, one having water permeability as in the first embodiment is used. As the sheet material constituting the outer layer 3, a film of a polyolefin such as polyethylene or polypropylene, a thermoplastic resin such as polyester, or the like is suitably used. The sheet material having a basis weight of 10 to 100 g / m ² , particularly 20 to 50 g / m ² , is economical, secures strength during use, and exhibits sufficient liquid impermeability. Preferred from the point. For the same reason, the thickness is preferably 0.2 to 2 mm.
It is also preferable to use a laminate of a thermoplastic resin film and a thermo-adhesive nonwoven fabric as the sheet material from the viewpoint of improving the strength and flexibility of the outer layer 3.

The outer layers 3, 4 and the inner layer 2 have substantially the same width. The outer layers 3 and 4 extend from the front and rear ends of the inner layer 2, and the two layers are integrally joined and fixed at the extending portion by a predetermined joining means. As a means for bonding and fixing, pressure bonding, fusion, adhesion, or any combination thereof is used.

As shown in FIG. 3, the cleaning tool 10 comprises a flat cleaning portion 11 on which the wet sheet 1 can be mounted, and a rod-shaped handle 12 connected to the cleaning portion 11 via a universal joint 13. ing. And wet sheet 1
Is mounted so that the outer layer 3 is in contact with the flat surface of the cleaning unit 11, and the extended portion of the wet sheet 1 is fixed by a number of flexible pieces 14 forming radial slits in the cleaning unit 11. Is done. As described above, since the outer layer 3 is made of a liquid-impermeable material, the aqueous liquid does not adhere to the cleaning tool during cleaning.

Also in the present embodiment, embossing is performed as in the first embodiment, and the projections 5 and the depressions 6 are formed on the surface. However, the convex portion 5 and the concave portion 6 are
It is formed only on the outer layer 4 side, that is, on the surface side having liquid permeability. Thereby, even when a large amount of aqueous liquid is held, the integrity of the wet sheet 1 as a laminate is maintained, and the operability of the wet sheet 1 when used by being attached to the cleaning tool 11 is maintained. Dripping.

The present invention is not limited to the above embodiment. For example, the cleaning sheet in the above-described embodiment has a three-layer structure. Alternatively, the cleaning sheet may have a single-layer structure or a multi-layer structure of two or four or more layers. For example,
A water-permeable outer layer may be laminated only on one side of the inner layer 2 in the above embodiment.

The shape of the projection formed by embossing the wet sheet can be various shapes according to the ease of manufacturing the sheet and the cleaning performance of the wet sheet.

[0052]

EXAMPLES In the following examples, "%" means "% by weight" unless otherwise specified.

Example 1 A low-melting-point fiber (6.6 dtex × 51 mm, sheath component having a melting point of 110) having a core-sheath structure made of polyester and polyethylene and a sheath made of polyethylene and having a crimp shape.
C.) and rayon fibers (5.5 dtex × 51 mm) in a weight ratio of 70/30 to produce a fiber web having a basis weight of 40 g / m ² using a conventional carding machine. The fiber web was dried at 130 ° C. to prepare an air-through nonwoven fabric (basis weight 40 g / m 2) as an inner layer. The air-through nonwoven fabric was cut into a size of 10 cm × 28 cm.

Rayon fiber (1.7 dtex × 40 m)
m) and acrylic fiber (0.9 dtex x 51 mm)
And a core-sheath fiber (1.0 dtex × 38 mm) having a core of polypropylene and a sheath of polyethylene in a weight ratio of 50.
A fiber web having a basis weight of 40 g / m ² mixed at a ratio of / 25/25 was produced by a conventional card machine. This fiber web was subjected to a water needling treatment under low energy conditions to produce a spunlace nonwoven fabric as one outer layer. A liquid-impermeable polyethylene film having a basis weight of 40 g / m ² was prepared as the other outer layer. The spunlace nonwoven fabric and the polyethylene film were cut into a size of 22 cm × 28 cm.

An air-through nonwoven fabric of an inner layer is layered on the center of the spunlace nonwoven fabric, and 20 g of a low-fluid aqueous liquid having the following composition is uniformly and intermittently applied to the air-through nonwoven fabric using a spoon. It is. Then, a polyethylene film is layered on the air-through non-woven cloth coated with the aqueous liquid, and heat-sealed so as to form a square pattern of 5 cm × 5 cm to integrate the three members, and a wet sheet as shown in FIG. 2 is formed. Obtained. By this heat sealing, convex portions and concave portions were formed on the surface of the wet sheet on the spunlace nonwoven fabric side. The width of the recess was 1 mm.

Low flow aqueous liquid composition: water / ethanol /
2-amino-2-methyl-1-propanol / dodecylglucoside (degree of condensation 1.4) / thickener [polyacrylic acid (Carbopol Ultrez 10, BF Goodrich)] = 92.2 / 6 / 0.1 /0.7/1 (weight ratio), (viscosity: 230,000 mPa · s / 25 ° C)

Example 2 A wet sheet was obtained in the same manner as in Example 1 except that the low-fluid aqueous liquid having the following composition was used.

Low-flow aqueous liquid composition: water / ethanol /
2-amino-2-methyl-1-propanol / dodecylglucoside (condensation degree 1.4) / thickener (polyvinyl alcohol 1000) = 87.8 / 6 / 0.1 / 0.1 / 6
(Weight ratio), (viscosity: 20,500 mPa · s / 25)
℃)

Example 3 A wet sheet was obtained in the same manner as in Example 1 except that a low-fluid aqueous liquid having a gel composition having the following composition was used. However, regarding the addition of the aqueous liquid, the gel was hardly deformed, so that it was placed on an air-through nonwoven fabric. Gelation of the aqueous liquid was performed by crosslinking sodium alginate and calcium ions. Specifically, dodecyl glucoside is added to an aqueous solution of sodium alginate to make the concentration of sodium alginate 2%. To 1 kg of this solution, 500 ml of a 0.25% dibasic calcium phosphate suspension is added, followed by 500 ml of a 2.5% aqueous citric acid solution immediately after preparation, and the mixture is stirred well for 1 minute and left as it is.

Low-fluidity aqueous liquid composition: water / dodecylglucoside (degree of condensation 1.4) / gelling agent (sodium alginate) / dicalcium phosphate / citric acid = 97.52
5 / 0.1 / 1 / 0.125 / 1.25

Example 4 A wet sheet was obtained in the same manner as in Example 1 except that the low-fluid aqueous liquid used was a gel having the following composition. However, regarding the addition of the aqueous liquid, the gel was hardly deformed, so that it was placed on an air-through nonwoven fabric. The gelation of the aqueous liquid was performed by the interaction between ι-carrageenan and calcium ions. Specifically, calcium chloride is added to an aqueous solution of ι-carrageenan, and dissolved by increasing the temperature. In this solution,
Add the pre-warmed aqueous solution of dodecyl glucoside and add 1
Stir well for a minute and leave as is.

Low fluid aqueous liquid composition: water / dodecylglucoside (degree of condensation 1.4) / gelling agent (ι-carrageenan) / calcium chloride = 98.8 / 0.1 / 1 / 0.1

Example 5 A wet sheet was obtained in the same manner as in Example 1 except that the low-flowable aqueous liquid used was a gel having the following composition. However, regarding the addition of the aqueous liquid, the gel was hardly deformed, so that it was placed on an air-through nonwoven fabric. As the gelling agent for the aqueous liquid, a highly water-absorbing resin made of crosslinked polyacrylic acid, which is used in disposable diapers and the like, was used. After premixing components other than the gelling agent, a superabsorbent resin equivalent to 1% was added and stirred to absorb the liquid into the superabsorbent resin to form a gel.

Low-fluid aqueous liquid composition: water / ethanol /
2-amino-2-methyl-1-propanol / dodecylglucoside (degree of condensation 1.4) / gelling agent (crosslinked polyacrylic acid) = 92.8 / 6 / 0.1 / 0.1 / 1 (weight ratio) )

Comparative Example 1 A wet sheet was obtained in the same manner as in Example 1 except that the aqueous liquid having the following composition was used.

Aqueous liquid composition: water / ethanol / 2-amino-2-methyl-1-propanol / dodecylglucoside (condensation degree 1.4) = 93.8 / 6 / 0.1 / 0.1 (weight ratio) , (Viscosity: 4 mPa · s / 25 ° C)

Comparative Example 2 A wet sheet was obtained in the same manner as in Example 1 except that an aqueous liquid having the following composition was used.

Aqueous liquid composition: water / ethanol / 2-amino-2-methyl-1-propanol / dodecylglucoside (condensation degree 1.4) / thickener [polyacrylic acid (Carbopol Ultrez 10, manufactured by BF Goodrich)] ] = 93.
73/6 / 0.1 / 0.1 / 0.07 (weight ratio), (viscosity: 480 mPa · s / 25 ° C.)

[Examples 6 to 13] The amount of the aqueous liquid added to the air-through nonwoven fabric used for forming the inner layer was set to 40 g, and in the same aqueous liquid composition as in Example 1, a thickener [polyacrylic acid] was used. Acid (Carbopol Ultrez1)
0, manufactured by BF Goodrich)] and water, and a wet sheet was obtained in the same manner as in Example 1 except that aqueous solutions having different viscosities were prepared by changing the ratio of water as needed.

Comparative Example 3 The procedure of Example 1 was repeated, except that the amount of the aqueous liquid added to the air-through nonwoven fabric used for forming the inner layer was 40 g, and that the aqueous liquid used had the following composition. A wet sheet was obtained.

Aqueous liquid composition: water / ethanol / 2-amino-2-methyl-1-propanol / dodecylglucoside (degree of condensation 1.4) = 93.8 / 6 / 0.1 / 0.1 (weight ratio) , (Viscosity = 4 mPa · s / 25 ° C.)

Comparative Example 4 The procedure of Example 1 was repeated, except that the amount of the aqueous liquid added to the air-through nonwoven fabric used to form the inner layer was 40 g, and that the aqueous liquid used had the following composition. A wet sheet was obtained.

Aqueous liquid composition: water / ethanol / 2-amino-2-methyl-1-propanol / dodecylglucoside (condensation degree 1.4) / thickener [polyacrylic acid (Carbopol Ultrez 10, manufactured by BF Goodrich)] ] = 93.
5/6 / 0.3 / 0.1 / 0.1 (weight ratio), (viscosity:
1400 mPa · s / 25 ° C.).

[Evaluation of Performance] With respect to the wet sheets obtained in Examples and Comparative Examples, the reduction rate of the aqueous liquid after leaving for 120 minutes was measured by the above-mentioned method. , The dust collection rate was measured, and the washing performance of soy sauce stains was evaluated. The results are shown in Tables 1 and 2 below.

[Dust Collection Rate] A wet sheet was attached to a quickle wiper (Kao Corporation). 100cm
0.1g of 7 kinds of JIS test dust (Kanto loam layer, fine grain) was sprayed (uniformly over the entire surface using a brush) on a × 100cm flooring (Woody tile MT613T, manufactured by Matsushita Electric Works), and the flooring was reciprocated once. 4 rows were cleaned.
After performing this operation six times continuously, the soiled wet sheet was dried and the weight (sheet + aqueous liquid nonvolatile content + dust) was measured. The amount of collected dust was calculated by subtracting the weight of the sheet measured before cleaning and the weight of the non-volatile substance of the theoretically remaining aqueous liquid, and the total weight of the dust sprayed (0.6 g = 0.1 g)
X 6 times), multiplied by 100, and the value was taken as the dust collection rate.

[Washing properties of soy sauce stains] One drop of commercially available soy sauce (0.02
g) Hang down and dry with a dryer. A wet sheet was attached to a quickle wiper (Kao Corp.), dried soy sauce stains were cleaned, and the washability was evaluated according to the following criteria. ：: Dirt was completely removed by cleaning 10 times. Δ: Dirt was completely removed by 20 round trip cleanings. D: Dirt could not be completely removed even after cleaning for 20 reciprocations or more. XX: The aqueous liquid was excessively released, and dirt was wiped and spread over the entire surface, resulting in poor finish.

[0077]

[Table 1]

[0078]

[Table 2]

As is evident from the results shown in Tables 1 and 2, according to the wet sheets (products of the present invention) of the examples in which the reduction rate of the aqueous liquid was equal to or less than a specific value, after leaving for 120 minutes. It can be seen that the particles also have a high dust collecting property and are excellent in cleaning stain stains. Although not shown in the table, the finish after cleaning the wet sheet in each example was good, and there was no need to wipe twice.

According to the present invention, there is provided a cleaning wet sheet having excellent cleaning durability. Further, according to the present invention, there is provided a cleaning wet sheet capable of removing light stains and dust on the floor without wiping twice. Further, according to the present invention, there is provided a cleaning wet sheet capable of cleaning a wide-area surface to be cleaned.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing a cleaning wet sheet according to a first embodiment of the present invention.

FIG. 2 is a perspective view schematically showing a cleaning wet sheet according to a second embodiment of the present invention.

FIG. 3 is a perspective view showing an example of a usage form of the cleaning wet sheet shown in FIG. 2;

FIG. 4 is a schematic view showing a method for measuring a reduction rate of an aqueous liquid contained in a cleaning wet sheet of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cleaning wet sheet 2 Inner layer 3, 4 Outer layer 5 Convex part 6 Concave part

Claims (5)

[Claims] 1. A cleaning wet sheet in which a low-flowing aqueous liquid is retained and a surface layer serving as a cleaning surface is liquid-permeable, and the cleaning wet sheet in an expanded state is formed of 20 A wet sheet for cleaning, wherein the reduction rate of the aqueous liquid after hanging for 120 minutes in an environment of 65 ° C. and 65% RH is 40% by weight or less. 2. The cleaning wet sheet according to claim 1, wherein the aqueous liquid contains 60% by weight or more of water. 3. The aqueous liquid contains an organic polymer as a thickener and has a viscosity at 25 ° C. of 10,000 to
The cleaning wet sheet according to claim 1, which is in a thickened state of 1,000,000 mPa · s or in a gel state. 4. The method according to claim 1, wherein the aqueous liquid is 150 to 3000 g / m ^2.
The cleaning wet sheet according to any one of claims 1 to 3, which is held. 5. The cleaning device according to claim 1, wherein the cleaning device includes a cleaning unit and a rod-shaped handle connected to the cleaning unit, and is attached to the cleaning unit and used for cleaning a floor. For wet sheet.