JP2000210238A - Cleaning sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To satisfy both the strength and the freedom of fiber necessary for the dust collecting performance of a cleaning sheet by forming fibers constituting the outside layer of nonwoven fabric in loops and entangling the outside layer constituting fiber and the inside layer constituting fiber to integrate the outside layer with the inside layer. SOLUTION: The three-dimensionally entangled nonwoven fabric used for this cleaning sheet comprises an inside layer 2, outside layers 3, 3 with density lower than that of the inside layer 2 placed on at least one side of the inside layer 2, and a network sheet 4. The inside layer 2 is integrated in an entangled condition with the network sheet 4 as well as the entanglement between fibers constituting the inside layer 2. At least fibers positioned on the most outside surface of the outside layer 3 are formed into loops and the density of the outside layer 3 is low causing a low entangled condition of the outside layer 3. Thus various kinds of dust from dust on a general floor to dust on a desk and furniture with a smooth surface and plastic products, further, comparatively large dust such as bread crumbs, eraser dust, etc., can be collected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry cleaning sheet capable of collecting various dusts. The cleaning sheet of the present invention is particularly suitably used for a cleaning sheet replacement type cleaning tool for floor wiping and a cleaning sheet replacement type handy type cleaning tool.

[0002]

BACKGROUND OF THE INVENTION The present applicant first reinforces a nonwoven fabric formed by entanglement of fibers with a mesh sheet, and obtains the necessary strength at the time of cleaning and the amount of cotton dust,
It can satisfy both the degree of freedom of fiber that can be entangled from large dust such as lint and hair to fine dust such as soil dust, and can collect various dusts used for floor mop for cleaning sheet exchange type A cleaning sheet has been disclosed (see Japanese Patent Application Laid-Open No. 07-184815).

However, such a cleaning sheet has a high collecting property for dust such as cotton dust and hair on flooring materials such as a flooring, a cushion floor and a tatami mat, but has a high surface smoothness, a flooring material and a decorative board. Further, there has been a demand for further improving the performance of collecting dust on resin-coated furniture and the like and plastic products, and collecting relatively large particulate dust such as breadcrumbs and eraser dust. An object of the present invention is to provide a cleaning sheet that can satisfy such a demand.

[0004]

Means for Solving the Problems The present inventors have established an inner layer,
It has been found that a sheet made of a nonwoven fabric comprising an outer layer having a lower density than the inner layer and having constituent fibers of the outer layer in a specific entangled state can achieve the above object.

The present invention has been made based on the above findings. In a cleaning sheet made of a nonwoven fabric formed by three-dimensional entanglement of fibers, the nonwoven fabric is provided on an inner layer, and on at least one surface of the inner layer. A cleaning sheet comprising an outer layer having a lower density than the outer layer, wherein the constituent fibers of the outer layer form a loop, and the fibers are entangled with the constituent fibers of the inner layer to integrate the outer layer and the inner layer. The above object has been achieved by providing

[0006] In a preferred embodiment of the present invention, the outer layer is a low-entangle fiber having a degree of freedom of fiber that can entangle fibrous dust with constituent fibers of the outer layer and hold the entangled dust between the constituent fibers. It is in a matching state.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The cleaning sheet of the present invention is described below.
The preferred embodiment will be described with reference to the drawings.

The cleaning sheet 1 of this embodiment is made of a non-woven fabric formed by three-dimensional entanglement of fibers. As shown in FIG. 1, the non-woven fabric has an inner layer 2 and at least one surface of the inner layer 2 (see FIG. 1). Are formed on the both sides) and the outer layers 3 and 3 having a lower density than the inner layer 2 and the mesh sheet 4, and the inner layer 2 is entangled with the mesh sheet 4 together with the entanglement between the constituent fibers. Is integrated. Examples of nonwoven fabrics formed by three-dimensional entanglement of fibers include so-called spunlaced nonwoven fabrics obtained by subjecting a fiber web to a water needling treatment under low energy conditions.

As shown in FIG. 2, the constituent fibers of the outer layer 3 have at least the fibers located on the outermost surface thereof forming a loop, and are in a so-called raised or raised state (however, not a raised state due to fiber ends). ). The constituent fibers of the outer layer 3 forming such a loop are in a low entanglement state in combination with the low density of the outer layer, and the desks and furniture and the like having a smooth surface from the dust on the general flooring material. It is possible to collect various dusts such as dust on plastic products and relatively large dusts such as breadcrumbs and eraser scum. In addition, if a large amount of dust is collected, pills are formed by the constituent fibers of the outer layer 3 and serve as a guide for replacing the cleaning sheet 1. In the present specification, the phrase that the constituent fibers of the outer layer form a loop means that, when the outer layer 3 is observed with a microscope, the constituent fibers form a ring closed outward and the constituent fiber ends project outward. Not mean.

The constituent fibers of the outer layer 3 only need to form a loop to such an extent that the cleaning sheet of the present invention can exhibit a desired dust collecting effect, and it is necessary that all the constituent fibers form a loop. There is no. Further, the shape of the loop may be various shapes such as an arc shape, an oval shape, and the like, and the loop may be twisted.

As shown in FIG. 2, the constituent fibers of the outer layer 3 are entangled with the constituent fibers of the inner layer 2 so that the outer layer 3 and the inner layer 2 are integrated. In particular, it is preferable that at least the ends of the constituent fibers of the outer layer 3 are buried in the inner layer 2 and entangled with the constituent fibers of the inner layer 2. As described above, since the density of the inner layer 2 is higher than that of the outer layer 3, since the constituent fibers of the inner layer 2 having a higher density and the constituent fibers of the outer layer 3 are entangled, the cleaning sheet of the present invention is used. During cleaning, the constituent fibers of the outer layer 3 can be prevented from falling off.

The inner layer 2 has an apparent density of 0.015 to 0.015.
0.2 g / cm ^3, in particular it is 0.03~0.1g / cm ³ is the point of preventing fluffing and breaking occurred during cleaning to ensure sufficient strength, reliably capturing the fine soil dust from accumulating inside It is preferable because it can be collected and held and the inner layer 2 and the outer layer 3 can be easily integrated.

The thickness of the inner layer 2 can be appropriately selected within the range of the apparent density described above. However, if the thickness is too small, the rigidity decreases and the cleaning sheet becomes difficult to handle. .15 to 5 mm are preferred,
In particular, it is preferably from 0.3 to 3 mm.

The basis weight of the inner layer 2 can also be appropriately selected within the above range of the apparent density.
Preferably 100 g / m ^2, it is preferred that particularly 40~70g / m ^2.

On the other hand, each of the outer layers 3, 3 disposed on both sides of the inner layer 2 has a thickness of 0.1 to 5 mm, particularly 0.2 to 2 mm, which is relatively small, such as breadcrumbs or eraser dust. This is preferable in that large dust can be reliably held, fibers can be prevented from being removed during cleaning, and relatively fine dust can be reliably held in the inner layer 2.

Each of the outer layers 3 and 3 has an apparent density of 0.0001 to 0.015 g / cm ³ , particularly 0.1 g / cm ³ .
The amount of 001 to 0.005 g / cm ³ is preferable from the viewpoints of securing the degree of freedom of fibers that can be sufficiently entangled with dust when collecting relatively large dust and the number of fibers that hold the entangled dust. Further, as described above, the density of the outer layers 3 and 3 is lower than the density of the inner layer 2, and specifically, the density of the outer layers 3 and 3 is ２〜 to 1/2000, particularly 1/5 of the density of the inner layer 2. It is preferable that it is 〜 1/200.

Further, each of the outer layers 3 and 3 has a basis weight of 0.1 to 10 g / m ² , particularly 0.3 to 5 g / m ² , so that the number of fibers intertwined with dust is ensured. This is preferable because it can collect and hold extremely large trash.

The thickness, density and basis weight of each of the outer layers 3 and 3 may be the same or different.

The thickness of the entire cleaning sheet 1 is appropriately selected within a range in which the apparent densities of the inner layer 2 and the outer layer 3 have the above-mentioned values, but a general range is 0.25 to 10 mm, particularly 0.5 to 10 mm. It is preferably 5 mm. The basis weight of the cleaning sheet 1 is 40 to 100 g / m ² , particularly 50 to 7 g / m ² .
0 g / m ² is a point that prevents soil dust and the like from leaking to the back side of the sheet during cleaning and hands and the like are soiled, and sufficiently secures entanglement between constituent fibers of the sheet to improve workability; It is preferable from the viewpoint of preventing the fibers from falling off during cleaning. The basis weight in the present embodiment includes the basis weight of the mesh sheet 4.

The thickness described above is determined by a microscope [VH
-6200 (lens, VH-Z25) manufactured by Keyence Corporation]. Specifically, the cross section of the sheet is 1
Observation was carried out at a magnification of 00, and a portion having a low fiber density (ie, the outer layer) and a portion having a high fiber density (ie, the inner layer) were directly observed and measured. Also,
Laser Scan Microscope [PA1801
(Manufactured by Keyence Co., Ltd.). In this case, after measuring the entire thickness, the outer layer 3 is cut out and the thickness of the inner layer 2 is measured. The measurement of the total thickness and the thickness of the inner layer 2 was carried out by first using a laser reflecting plate (5 cm × 5 cm acrylic plate with a white tape; weight 3.7 g, load 0.15 g / cm).
^2. Measure the thickness only with a thickness of 1.7 mm) and adjust the zero point of the device. Next, the reflector (load: 0.15 g / cm ² ) is placed on the measurement sample, and the thickness is measured. At this time, the sample is measured evenly five times, and the average value is defined as the thickness. The thickness of the outer layer 3 can be calculated by subtracting the thickness of the inner layer 2 from the entire thickness. The density was calculated by dividing the grammage by the obtained thickness. The grammage of the inner layer 2 and the outer layer 3 is determined by measuring the grammage of the entire sheet, then removing the outer layer 3 using a clipper or shaving scissors for animal experiments, and measuring the grammage of the inner layer 2. The weight was calculated by subtracting the weight of the inner layer 2 from the weight of the entire sheet.

The constituent fibers of the inner layer 2 preferably have a denier of 6.0 denier or less, particularly preferably 3.0 denier or less. The constituent fibers may be continuous filaments,
Alternatively, staple fiber may be used. When using staple fiber, the fiber length is 20 to 100 mm,
In particular, it is preferably 30 to 65 mm.

The fibers used as the constituent fibers of the inner layer 2 include thermoplastic fibers such as polyolefin-based, polyester-based, and polyamide-based polymers, composite fibers thereof, semi-synthetic fibers such as acetate, cupra, and the like.
Regenerated fibers such as rayon or natural fibers such as cotton may be used, or a mixture thereof.

On the other hand, the constituent fibers of the outer layer 3 include the inner layer 2
It is preferable to use a staple fiber having the fineness described above with respect to the constituent fibers of the above. The fiber length of this staple fiber is the same as that of the constituent fiber of the inner layer 2 described above. Specific examples thereof are also the same as those exemplified for the constituent fibers of the inner layer 2. In this case, the constituent fibers of the inner layer 2 and the constituent fibers of the outer layer 3 may be the same or different.

In order to improve the physical properties of the surface of the cleaning sheet 1, an oil component or the like that adsorbs dust may be appropriately applied to the inner layer 2 and the outer layer 3.

The oil component is added in an amount of 0.1 to 40% by weight, especially 0.5 to 30% by weight, based on the nonwoven fabric composed of the inner layer 2 and the outer layer 3. It is preferable from the viewpoint of improving the collection amount and preventing the oil component from seeping out from the nonwoven fabric and migrating to a large amount on the surface to be cleaned or adhering to the hand.

The oil component preferably contains at least one of mineral oil, synthetic oil, silicone oil and surfactant.
Examples of the mineral oil include paraffinic hydrocarbons, naphthenic hydrocarbons, and aromatic hydrocarbons. As a synthetic oil, an alkylbenzene oil, a polyolefin oil, a polyglycol oil, or the like is used, and as a silicone oil, a chain dimethylpolysiloxane, a cyclic dimethylpolysiloxane, a methylhydrogenpolysiloxane, various modified silicones, and the like can be given. Examples of the surfactant include nonionic, cationic, anionic, and amphoteric surfactants, and are appropriately selected according to the type of fiber used in the nonwoven fabric and the type of other oil agent components used in combination. Used.

The net-like sheet 4 in the cleaning sheet 1 of the present embodiment comprises a grid-like net as shown in FIG. Since the mesh sheet 4 is used to impart strength to the cleaning sheet, if the nonwoven fabric composed of the inner layer 2 and the outer layer 3 has sufficient strength, the mesh sheet 4
There is no need to use. The wire diameter of the mesh sheet 4 is 20 μm or more.
It is preferably 500 μm, particularly preferably 100 μm to 200 μm. Further, the distance between the lines is preferably 2 mm to 30 mm, particularly preferably 4 mm to 20 mm.

The material of the reticulated sheet 4 can be appropriately selected from polyolefin-based, polyester-based, polyamide-based, acrylonitrile-based, vinyl-based, and vinylidene-based polymers.

When a mesh sheet is used in the cleaning sheet of the present invention, in addition to the mesh sheet 4 shown in FIG. 3, a perforated film having a large number of holes, a textured space such as a gauze-like woven cloth is used. A carrier having a certain hole such as a relatively large coarse woven fabric and a nonwoven fabric having fiber voids and capable of integrating the constituent fibers of the inner layer 2 in an entangled state can be used.

The cleaning sheet of the present invention preferably has a breaking strength of 5 N / 30 mm or more from the viewpoint that the cleaning sheet can be prevented from being broken during cleaning.

As for the elongation of the cleaning sheet, 5
The elongation under a load of N / 30 mm is 20% or less,
This is preferable from the viewpoint of preventing the cleaning sheet from being distorted or distorted during cleaning, thereby preventing usability from being deteriorated. The smaller the value of this elongation, the better. Such a problem becomes conspicuous when the cleaning sheet is attached to a cleaning sheet replacement type cleaning tool described in Japanese Utility Model Application Laid-Open No. 2-119152 or the like to perform the wiping operation.

Here, the breaking strength is a load value (first peak value at the time of measuring the tensile strength) at which the cleaning sheet of the present invention starts to break when a tensile load is applied to the cleaning sheet. The degree means the elongation of the cleaning sheet when the load value is 5 N / 30 mm.

The cleaning sheet shown in FIG. 1 can be manufactured by various methods. For example, a fiber web obtained by processing fibers having a predetermined fiber length with a card machine is laminated on the upper and lower sides of the mesh sheet 4, and then subjected to a water needling treatment under a low energy condition to form a fiber entanglement of the fiber web. A sheet in which the non-woven inner layer is entangled with the mesh sheet together with the entanglement between the constituent fibers is obtained, and the surface of the inner layer is loosened with a brush or the like, whereby the constituent fibers are looped. The cleaning sheet 1 can be obtained by forming the outer layer in the shape of a circle. Alternatively, an inner-layer fiber web and an outer-layer fiber web prepared by processing fibers having a predetermined fiber length by a card machine are prepared, and the inner-layer fiber web is laminated on the upper and lower sides of the mesh sheet 4, and then a low energy fiber is formed. There is a method in which a water needling treatment is performed under the conditions, and a fiber web for an outer layer is laminated on the upper and lower sides, and then a water needling treatment is performed under lower energy conditions. Thereby, the nonwoven fabric-like inner layer formed by the fiber entanglement of the inner layer fiber web is integrated with the mesh sheet together with the entanglement between the constituent fibers in the entangled state, and Thus, the cleaning sheet 1 can be obtained in which the nonwoven fabric-like outer layer obtained from the outer layer fiber web is integrated by entanglement of the constituent fibers, and the constituent fibers of the outer layer form a loop.

Although the cleaning sheet of the present invention has been described based on the preferred embodiment, the present invention is not limited to the above embodiment, and various modifications can be made. For example, in the above embodiment, the outer layer 3 is provided on both surfaces of the inner layer 2, but the outer layer may be provided only on one surface of the inner layer instead.

[0035]

The present invention will be described below in detail with reference to examples.

[Examples 1 to 3] As a net-like sheet, a grid net made of polypropylene (line-to-line distance 8 mm, wire diameter 0.1 mm) was used.
2%), 70% by weight of polyester fibers (fineness: 0.8 denier, fiber length: 38 mm) above and below the mesh sheet
And polyester fiber (fineness 1.5 denier, fiber length 51
mm) and 30% by weight, and laminated by a conventional card so as to obtain a fiber web having a basis weight of 48 g / m ² .
The water needling treatment was performed under low energy conditions, and the nonwoven fabric-like inner layer formed by fiber entanglement of the fiber web was integrated in an entangled state with the mesh sheet together with the entanglement between the constituent fibers. I got a sheet. One side of this sheet was loosened with a toothbrush (Bit Vienna Lion Kaker (trade name)) to form outer layers in which the constituent fibers were looped. To the obtained sheet, 5% by weight of liquid paraffin (viscosity at 20 ° C. of 130 mPa · s) was applied by gravure coating to 5% by weight based on the total weight of the sheet to obtain a cleaning sheet. In the first embodiment, the number of times of loosening with a toothbrush is one, and in the second and third embodiments,
And 5 times.

Comparative Example 1 A sheet was obtained in the same manner as in Example 1 except that the operation of loosening with a toothbrush was not performed.

With respect to the cleaning sheet of the example and the sheet of the comparative example, the thickness and the basis weight of the inner layer and the outer layer were measured, respectively, and the collecting property of bread crumbs was evaluated by the following method. Table 1 shows the results.

<Bread crumb collecting property> Surface to be cleaned [decorative board (melamine 105H-7101, manufactured by Aika Kogyo KK)
Surface roughness: 0.9 μm)] Soft bread crumbs (size of about 1 to 1.4 m, manufactured by Nisshin Flour Milling Co., Ltd.)
m) Spray 0.1 g uniformly. The sheet is mounted on a plate having a size of 10 cm × 10 cm, and the sprinkled bread crumbs are wiped once and reciprocated six times with a load of 0.98 N. The amount of breadcrumbs collected and held on the sheet is measured.
The above operation was repeated 5 times using a new sheet, and the amount of bread crumbs collected was measured.
And the relative value was evaluated.

[0040]

[Table 1]

As is evident from the results shown in Table 1, the cleaning sheets of Examples 1 to 3 (products of the present invention) have an excellent ability to collect bread crumbs, whereas the cleaning sheets of Comparative Example 1 have excellent properties. Then, it turns out that collection property is bad. Although not shown in the table, none of the sheets of Examples 1 to 3 and Comparative Example 1 caused fiber dropout.

[0042]

According to the cleaning sheet of the present invention, it is possible to satisfy both the strength required at the time of cleaning and the degree of freedom of fibers required for the dust collecting performance. More specifically, various types of dust can be collected, from dust on general floor materials to relatively large dust such as breadcrumbs and eraser debris, and is particularly effective for a cleaning tool with a replaceable cleaning sheet. Is used regularly. In addition, if a large amount of dust is collected, pills are formed by the constituent fibers of the outer layer, so that it is possible to easily determine a guide for replacing the cleaning sheet.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing one embodiment of a cleaning sheet of the present invention.

FIG. 2 is an enlarged view showing a main part of the cleaning sheet shown in FIG. 1;

FIG. 3 is an enlarged plan view of a mesh sheet used for the cleaning sheet shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cleaning sheet 2 Inner layer 3 Outer layer 4 Reticulated sheet

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenji Ishikawa 2606 Kabane-cho, Akaga-cho, Haga-gun, Tochigi Prefecture In-house researcher (72) Inventor Yutaka Saito 2606 Kabashi-cho, Akaba-machi, Haga-gun, Tochigi Prefecture Kao Corporation F Terms (reference) 3B074 AA08 AB01 BB04

Claims (3)

[Claims] 1. A cleaning sheet comprising a non-woven fabric formed by three-dimensional entanglement of fibers, wherein the non-woven fabric comprises an inner layer, and an outer layer disposed on at least one surface of the inner layer and having a lower density than the inner layer, A cleaning sheet in which the constituent fibers of the outer layer form loops, and the fibers are entangled with the constituent fibers of the inner layer to integrate the outer layer and the inner layer. 2. The inner layer has an apparent density of 0.01.
5 to 0.2 g / cm ^ThreeAnd the outer layer has a thickness of
0.1 to 5 mm, and the apparent density is 0.0001 to
0.015g / cm^Three2. The cleaning sheet according to claim 1, wherein
G. 3. The cleaning sheet according to claim 1, further comprising a reticulated sheet, wherein the inner layer is integrally entangled with the reticulated sheet together with the entanglement of the constituent fibers. .