JP2003265387A - Cleaning sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cleaning sheet capable of effectively removing not only the soil dust, etc., on flat surfaces but the soil dust, etc., intruding into the ruggedness of surfaces for cleaning having the ruggedness, such as tatami mats, floorings having fine grooves, tiles, screen doors and wallpaper. <P>SOLUTION: The cleaning sheet is formed by impregnating a base material sheet consisting of a nonwoven fabric with an aqueous cleaning agent. The base material sheet includes 10 to 60 wt.% heat shrinkable fibers and 90 to 40 wt.% non-shrinkable fibers which do not substantially shrink thermally at the temperature at which the heat shrinkable fibers shrink. The surface of the cleaning sheet is formed to such a multicreased form that the contact area rate with the flat surface under 10 g/cm<SP>2</SP>load is 3 to 50% by shrinking of the heat shrinkable fibers. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a wet cleaning sheet. The cleaning sheet of the present invention is particularly preferably used for cleaning a surface to be cleaned having unevenness.

[0002]

2. Description of the Related Art The applicant of the present invention previously disclosed in Japanese Patent Laid-Open No. 2001-198066.
We proposed a wet cleaning sheet that is attached to a mop-shaped cleaning tool and is used for cleaning floors such as flooring. With this cleaning sheet, stains on the floor, dust on the floor, hair, solid dust, etc. can be removed with good operability.

However, when the cleaning sheet is used to clean a surface to be cleaned having irregularities such as tatami mats, flooring with fine grooves, tiles, screens, wallpaper, etc., dust and the like that have entered the irregularities are removed. Not easy to do. A method of forming unevenness on the sheet surface by hot embossing or the like and removing dust and the like by entering into the unevenness is also considered, but it is not an effective method because there is a problem such as reduction of the sheet thickness of the concave portion.

Therefore, the present invention is not limited to the flat surface,
An object of the present invention is to provide a cleaning sheet that can effectively remove dust and the like that have entered into the irregularities on the surface to be cleaned having irregularities such as tatami mats, flooring with fine grooves, tiles, screens, and wallpaper.

[0005]

The present invention comprises a non-woven fabric.
A cleaning sheet made by impregnating a base sheet with an aqueous detergent
In the above, the base sheet is heat-shrinkable fibers 10-6.
Substantially 0% by weight and the temperature at which the heat-shrinkable fiber shrinks
Containing 90 to 40% by weight of non-shrinkable fiber which does not heat shrink,
The surface of the cleaning sheet is used to shrink the heat-shrinkable fiber.
Therefore, 10 g / cm ²Contact with a flat surface under load
Wrinkle-shaped silk with an area ratio of 3 to 50%
Achieving the above objectives by providing a cleaning sheet
Of.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on its preferred embodiments. The cleaning sheet of the present invention is obtained by impregnating a base sheet made of a non-woven fabric with an aqueous detergent.
The base sheet is made of a non-woven fabric containing heat-shrinkable fibers and non-heat-shrinkable fibers. The heat-shrinkable fibers in the base sheet are heat-shrinked, and the heat shrinkage causes the non-heat-shrinkable fibers to bend or bend, resulting in a wrinkled surface of the base sheet. As a result, while maintaining the cleaning performance on the surface to be cleaned, it is easy to follow the surface to be cleaned having irregularities such as tatami mats, flooring with fine grooves, tiles, screens, and wallpaper, which is easy with conventional cleaning sheets. The ability to collect dust, hair, solid dust, etc., which has entered the irregularities that could not be removed, is enhanced. In addition, since the surface of the base sheet becomes wrinkled, the base sheet becomes bulky,
Retention of the aqueous detergent is enhanced. Furthermore, since the base sheet is impregnated with the water-based cleaning agent, the cleaning sheet has high cleaning performance against water-based stains and sebum stains.

The shape of the wrinkles formed on the surface of the base sheet is not particularly limited as long as it can enter the irregularities on the surface to be cleaned and can collect the dust and the like present on the irregularities. The wrinkle-like shape is caused by a difference in shrinkage between the heat-shrinkable fiber and the non-heat-shrinkable fiber, and the non-heat-shrinkable fiber becomes wavy when viewed from the cross-sectional direction of the substrate sheet. It means that the surface of the material sheet is wrinkled. The wrinkles may have a continuous shape in one direction or a discontinuous shape.
When high sheet strength is required due to a large area of the surface to be cleaned, it is preferable that the wrinkles have a short and shallow shape. When cleaning the surface to be cleaned having large and deep irregularities, it is preferable that the wrinkles have a long and deep shape. The shape of the wrinkles can be controlled by the manufacturing conditions of the non-woven fabric forming the base sheet.

The surface of a cleaning sheet in which a base sheet having a wrinkled surface is impregnated with an aqueous detergent is also wrinkled like the base sheet. The surface is reduced to 10 by the shrinkage of the heat-shrinkable fibers contained in the base sheet.
The contact area ratio to the flat surface under g / cm ² load is 3 to
It is wrinkled like 50%. 10 g / cm
The load of ² corresponds to the load applied to the cleaning sheet during normal cleaning operation. Since the surface of the cleaning sheet has such a wrinkled shape, as described above, the followability with respect to the surface to be cleaned having unevenness becomes good. Specifically, if the contact area ratio is less than 3%, the production stability is lowered, and if it exceeds 50%, the followability to the cleaning target surface having irregularities is not sufficiently exhibited. In particular, it is preferable that the contact area ratio with respect to the flat surface under a load of 10 g / cm ² is 5 to 40%, especially 5 to 30%, because the followability with respect to the surface to be cleaned having unevenness is further improved.

The contact area ratio is measured by the following method. Substrate sheet not impregnated with aqueous detergent (10 cm x 10
cm) is a black stamp ink (S-1) manufactured by Shachihata.
It was painted black evenly. The base sheet was impregnated with 750% aqueous detergent per weight (dry basis). The cleaning sheet thus obtained was placed on a copy sheet, and an acrylic plate (10 cm × 10 c) was placed on the sheet.
m, weight = 25 g), and a weight of 975 g was further placed thereon, and a load was applied for 30 seconds. Then, the weight was quickly removed, the acrylic plate and the sheet were removed, and the copy paper was air dried at room temperature. After drying, the area ratio of the black portion of the copy paper was measured by an image analyzer [New Qu, manufactured by Nexus Co., Ltd.].
be], and this value was defined as the contact area ratio.

The non-woven fabric constituting the substrate sheet may have a single layer structure as long as the surface thereof becomes wrinkled due to the difference in shrinkage between the heat-shrinkable fiber and the non-heat-shrinkable fiber,
Alternatively, it may have a multilayer structure of two or more layers. When high sheet strength is required due to the large area of the surface to be cleaned or the sharpness of the surface to be cleaned, a non-woven fabric with a single layer structure or a multilayer structure with high interlaminar peel strength is used. It is preferable. When cleaning a surface to be cleaned having large and deep irregularities, it is preferable to use a non-woven fabric having a multi-layer structure, which is easy to form long and deep wrinkles.
A non-woven fabric having a single-layer structure is preferable from the viewpoint of manufacturing cost and easiness of manufacturing.

In the non-woven fabric having a single layer structure, the heat shrinkable fiber is used.
Fibers and non-heat-shrinkable fibers are entangled with each other
The heat shrinkage of the fiber causes the non-heat shrinkable fiber to bend or bend.
The surface of the non-woven fabric is wrinkled. The non-woven fabric is
Basis weight of 40 to 200 g / m ², Especially 50-150 g /
m²Is to ensure the sheet strength and impregnate the cleaning agent.
It is preferable from the viewpoint of securing the amount.

The non-woven fabric having a single-layer structure is formed by, for example, forming a web containing heat-shrinkable fibers and non-heat-shrinkable fibers with a card machine and treating the web with a high-pressure water stream at a predetermined pressure so that the fibers are entangled with each other. After that, heat treatment is performed to soften and melt the heat shrinkable fiber to cause heat shrinkage. The basis weight of the web is determined in consideration of the increase in heat shrinkage due to heat treatment. The high-pressure water stream treatment can be carried out by a conventionally well-known method, and the conditions thereof may be set depending on the basis weight of the nonwoven fabric to be finally obtained. The heat treatment is preferably performed at a temperature near the melting point of the heat-shrinkable fiber. The method of heat treatment is not particularly limited, and for example, a hot air penetrating dryer or the like is used. Part of the heat-shrinkable fibers may be heat-sealed by heating. When the basis weight of the web is large, the fibers can be entangled with each other by needle punching instead of the high-pressure water stream treatment.

As the heat-shrinkable fiber, it is preferable to use one having a maximum heat shrinkage of at least 50% from the viewpoint of forming sufficient wrinkles on the surface of the obtained nonwoven fabric. The maximum heat shrinkage ratio means the maximum value of the heat shrinkage ratio that the heated fiber shows while maintaining the shape of the fiber. The heat-shrinkable fiber having such a maximum heat shrinkage is preferably used, for example, as a melting peak temperature (Tm) 130 ° C. <Tm.
Examples of the fiber include a polymer made of a polymer containing 70% by weight or more of an ethylene-propylene random copolymer having a temperature of <145 ° C. Other polymers used in combination with this ethylene-propylene random copolymer include ethylene-butene-1-
Examples thereof include propylene terpolymers and polyolefin polymers such as polypropylene. What is the melting peak temperature?
It means the peak temperature of polymer melting when the heat of fusion of the polymer is measured using a differential scanning calorimeter (DSC).
The heat-shrinkable fiber has a heat-shrink temperature of 130 to 145 ° C., especially 1
It is preferably 35 to 140 ° C. When the heat-shrinkable fiber is a short fiber, its fiber length is 38 to 76 m from the viewpoint of improving the passability to the card machine and the texture of the obtained web.
m, particularly preferably 45 to 55 mm. The heat-shrinkable fiber preferably has a fiber diameter of 1 to 4 denier, particularly 2 to 3 denier, from the viewpoint of softness (texture) of the resulting nonwoven fabric.

The non-shrinkable fiber used in combination with the heat-shrinkable fiber is not particularly limited in material as long as it does not substantially shrink at the temperature at which the heat-shrinkable fiber shrinks. For example, select one or more from recycled fibers such as rayon, semi-synthetic fibers such as acetate, natural fibers such as cotton and wool, synthetic fibers such as polypropylene, polyethylene, polyester, nylon, polyvinyl chloride and vinylon. Can be used. The fiber cross-sectional shape and the like are also not particularly limited, and splittable conjugate fibers, fibers having a modified cross-section, and the like can be arbitrarily used. The fiber diameter is preferably 1 to 4 denier, particularly 1 to 3 denier from the viewpoint of the mixing property with the heat-shrinkable fiber and the entanglement property by the high-pressure water treatment.

Particularly, non-shrinkable fibers are hydrophilic fibers 10 to 1.
It is preferably composed of 00% by weight and 0 to 90% by weight of hydrophobic fibers. That is, it is preferable that the non-shrinkable fiber is made of a hydrophilic fiber or a mixture of a hydrophilic fiber and a hydrophobic fiber. The reason for this is that when performing high pressure water flow treatment,
This is because the hydrophilic fiber is more compatible with water and the texture of the non-woven fabric is improved. Examples of hydrophilic fibers include rayon and acetate described above, and examples of hydrophobic fibers include polyester, polypropylene, polyethylene and nylon.

As the heat-shrinkable fiber and the non-shrinkable fiber, the heat-shrinkable fiber is used in an amount of 10 to 60% by weight, particularly 20 to 40% by weight, preferably 90 to 40% by weight, especially 60% of the nonshrinkable fiber. ~ 80 wt% is used. 1 heat shrinkable fiber
If the amount is less than 0% by weight or the amount of non-shrinkable fiber exceeds 90% by weight, the heat shrinkage of the entire nonwoven fabric is insufficient, and it is difficult to form wrinkles and bulky. 6 heat shrinkable fibers
If it exceeds 0% by weight or if the amount of the non-shrinkable fibers is less than 40% by weight, heat shrinkage is remarkable, the distance between fibers becomes too narrow, dust collection performance is deteriorated, and the texture of the nonwoven fabric becomes hard. Will end up.

The non-woven fabric having a multilayer structure is formed by laminating a second fiber layer made of non-shrinkable fibers on one or both sides of a first fiber layer containing heat-shrinkable fibers, and shrinking the first fiber layer by heat treatment. Thus, a non-woven fabric in which the surface of the second fiber layer is wrinkled is given. The ratio of the heat-shrinkable fibers to the non-heat-shrinkable fibers in this multilayer nonwoven fabric is the same as in the case of the single-layer nonwoven fabric described above. Also,
The types of heat-shrinkable fibers and non-heat-shrinkable fibers are the same as in the case of the non-woven fabric having the single-layer structure described above.

The first fiber layer contains heat-shrinkable fibers as described above. The proportion of the heat-shrinkable fibers contained in the first fiber layer is 50 to 70% by weight, which makes the formation of wrinkles good, the passability of the card machine, and the first fiber layer and the second fiber. It is preferable in that the layers are sufficiently fused.

A heat-fusible fiber may be used in the first fiber layer for the purpose of improving the fusion property between the first fiber layer and the second fiber layer.
The heat-fusible fiber is composed of a polymer whose melting point is lower than the shrinkage initiation temperature of the heat-shrinkable fiber.

The basis weight of the first fiber layer is 10 to 80 g / m ² ,
It is particularly preferably 10 to 40 g / m ² . The basis weight of the second fiber layer is 10 to 30 g / m ² , particularly 12 to ²⁰ g / m ² .
It is preferably m ² . As the second fiber layer, one having a non-woven fabric shape such as a heat-fusible non-woven fabric, a hydroentangled non-woven fabric, a spunbonded non-woven fabric, or a melt blown non-woven fabric can also be used.

The concavo-convex portion can be formed in the second fiber layer by shrinking the first fiber layer by heat treatment. For example, when a fiber made of an ethylene-propylene random copolymer is used as the heat-shrinkable fiber, the heat treatment temperature T (° C)
Is preferably within the range of 110 <T <melting peak temperature (Tm) +30 from the viewpoint that the heat shrinkage of the first fiber layer can be sufficiently performed while preventing the melting of the fiber. For heat treatment,
For example, a hot air penetration type processing machine can be used. The shrinkage rate of the first fiber layer is determined by the heat treatment temperature, the residence time and the like. Generally, the higher the heat treatment temperature,
The longer the residence time, the greater the shrinkage rate.

The multi-layered nonwoven fabric thus obtained preferably has the same basis weight as that of the above-mentioned single-layered structure for the same reason as in the case of the single-layered nonwoven fabric.

The non-woven fabric is made of many wrinkles formed on the surface thereof, regardless of whether it is a single layer or a multi-layer, for the purpose of improving its bulkiness, collecting various dusts and improving operability. In addition to the irregularities, the sheet itself may have irregularities. As a method for forming irregularities on the sheet itself, for example, a method of integrating a heat-shrinkable mesh net and a fibrous web by a water jet or the like, and then heat-treating the mesh net to shrink the mesh net to produce irregularities, spunlaced nonwoven fabric preparation Sometimes a method of engraving a pattern of a carrier wire on the non-woven fabric to develop irregularities, a method of sucking while holding a fibrous web on a pattern net, and engraving the pattern of the pattern net on the fibrous web to develop irregularities Etc. can be used.

Next, the aqueous cleaning agent with which the base sheet is impregnated will be described. Aqueous detergents have a viscosity of 2 at 25 ° C.
0 to 30000 mPa · s, preferably 100 to 100
0 mPa · s, more preferably 300 to 800 mPa · s
s. By using the aqueous cleaning agent having a viscosity in this range, (1) the amount of the aqueous cleaning agent released to the surface to be cleaned at the initial stage of cleaning is reduced, and the release amount of the aqueous cleaning agent from the beginning to the end of cleaning is reduced. It becomes uniform, (2) cleaning continuity is improved for a large area to be cleaned, and (3) the amount of the aqueous cleaning agent released is low even at the beginning of cleaning, so the friction resistance value of the cleaning sheet against the surface to be cleaned is reduced. (4) Since the amount of the aqueous cleaning agent released is low even in the initial stage of cleaning, the degree of fiber freedom on the surface of the cleaning sheet is high, and the hair and cotton dust on the surface to be cleaned are entangled and retained by the fibers. There is.
The viscosity is measured using a Brookfield viscometer. The rotor to be used and the rotation speed are appropriately changed depending on the viscosity of the aqueous detergent.

The aqueous detergent is 100 to 500% by weight, particularly 120 to 40% by weight (dry state) of the base sheet.
The impregnation of 0% by weight, particularly 140 to 350% by weight, provides sufficient cleaning performance against stain stains and dirt, and prevents the release of an excessive amount of cleaning agent and the resulting damage to the surface to be cleaned. It is preferable from the point. The impregnation rate of the aqueous cleaning agent is measured without impregnating the weight of the base sheet after the base sheet is impregnated with the aqueous cleaning agent and the excess water cleaning agent is removed by mangle treatment or the like. To be done.

The aqueous cleaning agent uses water as a medium, a surfactant,
It is preferable to contain an alkaline agent, a thickener, and a water-soluble solvent. It is preferable that all the components contained in the aqueous detergent are substantially water-soluble. The non-volatile residual component contained in the aqueous detergent is preferably 10% by weight or less from the viewpoint of finishability after cleaning, particularly preferably 5% by weight or less, and particularly preferably 1% by weight or less.
In particular, when the pH of the aqueous detergent is set within the range described below, it is preferable to combine an acidic thickener and an alkaline agent in combination from the viewpoint of suppressing acidic odor.

In particular, when the cleaning sheet of the present invention is used for cleaning tatami mats, the pH of the aqueous detergent is preferably 4 or more and less than 7, particularly 5 or more and less than 7. That is, it is preferable that the pH of the aqueous detergent is on the acidic side. When the pH is on the alkaline side, the decomposition of chloroplasts in the igusa that make up the tatami mat is promoted, and yellowing of the tatami mat is likely to occur. The reason for setting the lower limit of pH to 4 is to ensure safety for the human body and to suppress acidic odor and corrosion of metals.

As the thickener having acidity, it is preferable to use acrylic acid / alkyl methacrylate copolymer thickener, polyacrylic acid thickener and the like. On the other hand, as the alkaline agent, hydroxides such as sodium hydroxide, carbonates such as sodium carbonate, alkaline sulfates such as sodium hydrogensulfate, phosphates such as sodium monophosphate, sodium acetate, sodium succinate, etc. Organic alkali metal salts of ammonia, alkanolamines such as ammonia, mono-, di- or triethanolamine, 2-amino-2-methyl-1-
Examples thereof include β-aminoalkanols such as propanol and morpholine. Particularly, in terms of feel and pH buffering property, alkanolamines such as mono-, di- or triethanolamine, β-amino-2-methyl-1-propanol and the like are included.
-Aminoalkanols as well as morpholine are preferred.

The thickening agent is contained in the aqueous detergent in an amount of 0.01 to 2% by weight, particularly 0.02 to 1% by weight. It is preferable in terms of adjusting the amount of agent released. The alkaline agent is contained in the aqueous detergent in an amount of 0.01 to 1% by weight, particularly 0.01 to 0.5% by weight.
It is preferably contained from the viewpoints of cleanability, touch to the touch and pH adjustment.

As the surfactant, which is another component to be added to the aqueous detergent, any of anionic surfactants, nonionic surfactants, cationic surfactants and amphoteric surfactants can be used. It is preferable to use a nonionic surfactant or an anionic surfactant from the viewpoint of causing aggregation with an acidic thickener and preventing sedimentation resulting therefrom, and particularly, a nonionic surfactant is used. It is preferable to use. As the nonionic surfactant, alkyl glucoside, polyoxyalkylene alkyl ether,
Examples thereof include sorbitan fatty acid ester and allylic glyceryl ether. As the anionic surfactant, those having at least an alkyl group and a sulfonate group or a phosphate group are preferable. Specific examples of the anionic surfactant include alkyl sulfonate, alkyl diphenyl ether disulfonate, and polyoxyethylene (ethylene oxide addition mole number 1 to 20) alkyl ether phosphate. Examples of the salt constituting these anionic surfactants include sodium salt and potassium salt. The blending amount of the surfactant in the aqueous detergent is 0.005 to 2% by weight, particularly 0.01% by weight in view of the expression of sufficient cleaning performance and the blending amount of the thickener.
It is preferably ˜1% by weight.

Examples of the water-soluble solvent include monohydric alcohols such as ethanol, isopropyl alcohol and propanol, polyhydric alcohols such as ethylene glycol and propylene glycol, and their derivatives ethylene glycol monomethyl ether and propylene glycol monomethyl ether. . The water-soluble solvent is
From the viewpoint of reducing odor and skin irritation, it is preferable to add 1 to 50% by weight, particularly 1 to 20% by weight to the aqueous detergent.

Further, in the aqueous detergent, if necessary, a disinfectant, a fragrance, an antifungal agent, a coloring matter (dye, pigment), a chelating agent,
A wax agent, an antistatic agent, a surface modifier, a repellent and the like can also be included. As the repellent, particularly when targeting mites, it is preferable to use one or more selected from the group consisting of jasmonoids, chain sesquiterpene alcohols and chain diterpene alcohols.

As shown in FIG. 1, the cleaning sheet of the present invention is attached to the cleaning portion 11 of a cleaning tool 10 having a cleaning portion 11 and a rod-shaped grip 12 connected to the cleaning portion 11. Used. Specifically, the cleaning tool 10 includes a flat cleaning portion 11 to which the cleaning sheet 1 can be attached, and a rod-shaped handle 12 connected to the cleaning portion 11 via a universal joint 13.
The cleaning sheet 1 is configured to be fixed by a plurality of flexible piece portions 14 that are provided in the cleaning portion 11 and that form radial slits. By mounting on the hanging cleaning tool 10, the surface to be cleaned can be cleaned in a comfortable posture while standing.

The cleaning sheet of the present invention is particularly preferably used for cleaning a surface to be cleaned having irregularities such as tatami mats, flooring with fine grooves, tiles, screen doors, and wallpaper. Also,
Cleaning of walls, floors, ceilings, roofs, etc. inside and outside the house, cleaning of bathroom fixtures such as walls / floors / doors / tubs / basins in the bathroom,
Kitchen walls / floors / sinks / ranges / ventilating fans, cleaning cupboards, chests, tables, desks, chairs, bookshelves and other furniture, refrigerators, TVs, personal computers,
Cleaning electrical appliances such as stereos, air conditioners, microwave ovens, washing machines, dryers, and lighting equipment, cleaning windows used in residential windows, doors, furniture doors, automobile windows, etc., toilet floors, walls , Cleaning of doors, toilet bowls, toilet seats, etc., cleaning of tableware, cooking utensils, cleaning of painted surfaces and plastic surfaces of automobiles, motorcycles, etc., cleaning of automobile wheels, exteriors, entrances, terraces, fences, fences,
It is also effective for cleaning all hard surfaces such as cleaning the gate area.

Example 1 As the heat-shrinkable fiber, a fiber (melting peak temperature 136 ° C.) made of an ethylene-propylene random copolymer was used. Rayon fibers and acrylic fibers were used as the non-heat-shrinkable fibers. Using these fibers as raw materials, a web was formed using a card machine. The proportion of heat-shrinkable fibers in the web was 35% by weight, and the proportions of rayon fibers and acrylic fibers were 35% and 30% by weight, respectively. This web is hydroentangled with a water jet to form a rotary drum dryer (80 to 10).
Spunlace nonwoven fabric was produced by drying at 0 ° C. Then, this non-woven fabric is heat-treated at 140 ° C. using a heat-penetration dryer to shrink the heat-shrinkable fibers to form a large number of wrinkles on both sides of the non-woven fabric, and a heat-shrinkable spunlace having a basis weight of 70 g / m ^2. A non-woven fabric was obtained.

To this heat-shrinkable spunlace nonwoven fabric, an aqueous detergent having the composition shown in Table 1 and having a viscosity,
Impregnation was performed at the impregnation rate shown in the table to obtain a cleaning sheet.

Example 2 A cleaning sheet was obtained in the same manner as in Example 1 except that the aqueous cleaning agent shown in Table 1 was used.

[Comparative Example 1] Example 1 except that a spunlace nonwoven fabric (basis weight: 35 g / m ² ) before being heat-shrinked was used.
A cleaning sheet was obtained in the same manner as in.

Comparative Example 2 A rayon fiber and a core-sheath fiber having a core made of polypropylene and a sheath made of polyethylene were used as raw materials to form a web using a carding machine. The ratio of rayon fiber and core-sheath fiber in the web is 7 each
It was 0% by weight and 30% by weight. This web was hydroentangled with a water jet and dried with a rotary drum dryer (80 to 100 ° C.) to prepare a spunlace nonwoven fabric (grammage 70 g / m ² ). A cleaning sheet was obtained in the same manner as in Example 1 except that this spunlace nonwoven fabric was used.

Comparative Example 3 The spunlaced nonwoven fabric used in Comparative Example 2 was hot embossed to form irregularities having a contact area ratio of 15%. A cleaning sheet was obtained in the same manner as in Example 1 except that this spunlace nonwoven fabric was used.

[Performance Evaluation] With respect to the cleaning sheets obtained in Examples and Comparative Examples, the contact area ratio was measured by the method described above. The appearance of the sheet was evaluated by the following method. The following methods were used to measure the unevenness follow-up rate, dust collection rate, and hair collection rate. Furthermore, the removability of soy sauce dry stains on the 6th tatami mat was evaluated. The results are shown in Table 1.

[Evaluation of Sheet Appearance] 20 panelists visually evaluated whether the surface of the cleaning sheet had irregularities or wrinkles, and the most common opinion was used as an evaluation index.

[Following rate of unevenness] The color tone of a tatami mat (a commercially available polypropylene tatami mat is used in consideration of discoloration caused by cleaning) is measured by a color difference meter [CR-21 manufactured by Minolta Camera Co., Ltd.].
0] was used for the measurement. The value of the measured color tone is defined as color tone A. Next, in a 30 cm × 30 cm area of this tatami, using a tea strainer, 1 g of cotton linter (diameter 1.5 μm,
(1 mm or less in length) was uniformly sprayed. The color tone of the spraying site was measured by the method described above. The value of the measured color tone is defined as color tone B. The quickle wiper, a cleaning tool manufactured by Kao Co., Ltd., was fitted with a cleaning sheet, and the application area was wiped off once along the tatami mat so that the cleaning sheet could slide without applying excessive force. The color tone of the sprayed area after wiping was measured by the method described above. Let the value of the measured color tone be color tone C. Then, the value of the following formula (1) was used as a measure of the conformability to unevenness. If this value is less than 80%, the followability is insufficient, and unremoved cotton linter can be easily confirmed by visual observation. If this value is 80 to 100%, it is determined that there is sufficient followability. The color tone was measured at three points in one evaluation. The evaluation was performed twice, and the average value was used to calculate the color tone value.

[0044]

[Equation 1]

[Dust Collection Rate] A quick cleaning wiper (manufactured by Kao Corporation) was equipped with a cleaning sheet. 100 cm
0.1 g of 7 types of JIS test dust (Kanto loam layer, fine particles) was sprinkled on a tatami mat of 100 cm × 100 g (uniformly sprayed over the entire surface with a brush), and the tatami mat was cleaned in four rows with one round trip. After repeating this operation 6 times, the dirty cleaning sheet is dried and the weight (sheet + non-volatile component of cleaning agent + dust) is measured. The sheet weight measured before impregnation and the theoretical non-volatile component weight of cleaning agent remain. Was subtracted to calculate the amount of dust collected. The weight of the collected dust is the weight of the total dust scattered (0.6
g = 0.1 g × 6 times), multiply this by 100,
The value was defined as the dust collection rate (%).

[Hair collection rate] A quick cleaning wiper (manufactured by Kao Corporation) was equipped with a cleaning sheet. 30c
Spread 5 hairs of about 10 cm on a floor of mx 60 cm (woody tile MT613T manufactured by Matsushita Electric Works), put a cleaning sheet on it and clean it with a constant stroke (60 cm) for 2 reciprocations to make a cleaning sheet. The number of hairs collected was measured. This operation was repeated 6 times to measure how many hairs out of 30 hairs were collected.
The number of collected hairs was divided by 30, and this was multiplied by 100 to obtain the value as the hair collection rate (%).

[Removability of 6th tatami soy sauce dry stain] 1 drop (0.02) of commercially available soy sauce was placed on the flooring (area: 1 tatami mat).
g) It was dried and dried with a dryer. After attaching a cleaning sheet to the quickle wiper (manufactured by Kao Corporation) and continuously cleaning another clean flooring for 5 tatami mats, clean one tatami mat with dried soy sauce stains and remove the following: The evaluation was performed based on the standard. In addition, 5 to clean first
As for the floor of the tatami mat, one stroke is to wipe one back and forth at a distance of about 90 cm.
2 rows in m) and 4 rows in the lateral direction (90 cm) were wiped to clean one tatami mat. The flooring with soy sauce stains was wiped only on the stains, and the relationship between the number of cleanings and the stain removal was evaluated. ◯: Dirt was completely removed by cleaning less than 10 reciprocations. ○ to △: Dirt was completely removed by cleaning 15 times. Δ: Dirt could be completely removed by 20 reciprocating cleanings. Δ to ×: Dirt could be completely removed by 30 reciprocating cleanings. X: Dirt could not be completely removed even after 30 reciprocations.

[0048]

[Table 1]

As is clear from the results shown in Table 1, the cleaning sheet of the example (the product of the present invention) has a multi-wrinkled surface, which prevents cotton linters and dust from getting in between the tatami mats. It can be seen that the removability is excellent. It is also found that the flooring, which is a flat hard surface, is excellent in removability. On the other hand, the cleaning sheets of Comparative Examples 1 and 2 do not have a wrinkled surface, and are inferior in the ability to remove cotton linter and dust that have entered between tatami mats. In particular, the cleaning sheet of Comparative Example 1 may be inferior in the removability of soy sauce stains adhered to the flooring, which is a flat hard surface, due to the low basis weight of the sheet and the low persistence of the amount of detergent released. I understand. Further, the cleaning sheet of Comparative Example 3 was slightly embossed on the surface of the sheet by hot embossing, which slightly improved the ability to remove cotton and dust that had entered the tatami mat. It can be seen that the effect of reducing the contact area ratio is not effectively exhibited as compared with the cleaning sheet of the example due to the decrease in the sheet thickness. Furthermore, it can be seen that the hair-collecting property is also inferior due to the fact that the fiber freedom of the recesses is reduced by the hot embossing.

[0050]

EFFECTS OF THE INVENTION According to the cleaning sheet of the present invention, not only the flat surface but also the tatami, the flooring with fine grooves, the tiles, the screen doors, the uneven surface on the surface to be cleaned having the unevenness such as wallpaper are entered. It is possible to effectively remove dust and the like.

[Brief description of drawings]

FIG. 1 is a schematic view showing a usage pattern of a cleaning sheet of the present invention.

[Explanation of symbols]

1 cleaning sheet

Claims (5)

[Claims] 1. A base sheet made of a non-woven fabric and an aqueous detergent
In a cleaning sheet impregnated with The base sheet comprises 10 to 60% by weight of heat-shrinkable fibers and
Substantially no heat shrink at the temperature at which the heat shrink fiber shrinks
Non-shrinkable fiber 90-40% by weight, The surface of the cleaning sheet is used to shrink the heat-shrinkable fiber.
Therefore, 10 g / cm ²Contact with a flat surface under load
Wrinkle-shaped silk with an area ratio of 3 to 50%
Cleaning sheet. 2. The base sheet has a basis weight of 40 to 200 g.
/ M ² of non-woven fabric having a single layer structure, and the heat-shrinkable fiber has a melting peak temperature (Tm) of 130 ° C. <Tm <145 ° C.
70% by weight of ethylene-propylene random copolymer
The cleaning sheet according to claim 1, wherein the non-shrinkable fiber is composed of the above-mentioned polymer, and the non-shrinkable fiber is composed of 10 to 100% by weight of hydrophilic fiber and 0 to 90% by weight of hydrophobic fiber. 3. The aqueous detergent has a viscosity of 2 at 25 ° C.
The cleaning sheet according to claim 1 or 2, which has an amount of 0 to 30,000 mPa · s and is impregnated with 100 to 500% by weight based on the weight (dry basis) of the base sheet. 4. The cleaning sheet according to any one of claims 1 to 3, which is used by being attached to the cleaning part in a cleaning tool having a cleaning part and a rod-shaped grip connected to the cleaning part. 5. The pH of the aqueous detergent is 4 to 7,
The cleaning sheet according to claim 1, which is used for cleaning a tatami mat.