WO2011125143A1

WO2011125143A1 - Sheet for cleaning

Info

Publication number: WO2011125143A1
Application number: PCT/JP2010/007427
Authority: WO
Inventors: 菊夫山田
Original assignee: Yamada Kikuo
Priority date: 2010-04-08
Filing date: 2010-12-22
Publication date: 2011-10-13
Also published as: JP2011229871A

Abstract

A sheet for cleaning is provided with which even relatively large dust particles can be sufficiently wiped off and which can inhibit dust from escaping through the back. The sheet for cleaning (1) comprises nonwoven fabric (2) having openings (3) formed therein so that there are fibers (4) which run across the openings (3). Thus, even relatively large dust particles can be sufficiently wiped off with the sheet for cleaning, and the sheet can inhibit dust from escaping through the back.

Description

Cleaning sheet

The present invention relates to a cleaning sheet.

As a cleaning sheet used when cleaning a surface to be cleaned such as a floor using a mop, a dust sheet made of a nonwoven fabric formed by tangling short fibers has been proposed (Patent Document 1 and the like). . This cleaning sheet is attached to the pedestal of the mop, and the user moves the mop while applying an appropriate force to the handle attached to the pedestal, so that fine dust on the floor, sand, tobacco ash, The hair is cleaned.

In the dust sheet of Patent Document 1, among dust and dust on the surface to be cleaned, the tiny dust adhering to the surface to be cleaned, sand / ash, hair that easily deforms, etc. can be wiped off, but the size is sand. For dusts such as bread crumbs and rice grains that are larger than the above and are more difficult to deform freely than hair etc., there is a risk that they cannot be wiped off sufficiently.

Therefore, the present inventor examined a cleaning sheet provided with a large number of through holes on the cleaning surface of the nonwoven fabric as a cleaning sheet made of the nonwoven fabric. This cleaning sheet is configured to entangle dust such as bread crumbs at the through-hole portion during cleaning. That is, according to this cleaning sheet, it is possible to wipe off dust such as dust, sand, and bread crumb having a size larger than that of tobacco ash.

Japanese Patent Application No. 2007-154376

However, relatively large dust such as bread crumbs to be wiped off with a cleaning sheet with through holes formed is not always limited to a certain size, and there are various sizes. Dust has a large size distribution. In addition, the size of the dust may be reduced by breaking the dust during cleaning, which also increases the distribution range of the size of the dust. For this reason, depending on the size of the dust, there is a risk of forming a state in which dust passes through the through-hole of the cleaning sheet and enters the opposite surface of the cleaning sheet depending on the size of the dust. Sometimes). When dust comes through, dust easily comes into contact with the pedestal, and dirt is easily generated on the bottom surface of the pedestal.

In view of the above problems, the present invention is a cleaning sheet that can effectively wipe off dust such as bread crumbs that are larger in size than sand grains, and that can effectively suppress dust penetration. The purpose is to provide.

The present invention comprises (1) a cleaning sheet comprising a non-woven fabric having an aperture, and fibers that cross the aperture.
(2) The cleaning sheet according to (1), wherein the maximum diameter of the aperture is 80 to 300 times the maximum cross-sectional diameter of the fiber that crosses the aperture,
(3) The gist of the maximum diameter of the aperture is 1 to 3 mm, and the cleaning sheet according to (1) or (2).

According to the present invention, it is possible to obtain a cleaning sheet capable of effectively wiping dust such as bread crumb having a size larger than that of sand grains. In particular, according to the present invention, not only the opening portion is formed in the nonwoven fabric, but also fibers that cross the inside of the opening portion, so that dust wiped off at the opening portion of the nonwoven fabric crosses the inside of the opening portion. It will be effectively trapped between the fiber and the peripheral edge of the aperture, and the risk of dust penetration will be effectively suppressed. In addition, according to the present invention, when the maximum diameter of the aperture is 80 to 300 times the maximum cross-sectional diameter of the fiber crossing the aperture, dust such as bread crumbs is more effectively wiped off. Can be taken.

FIG. 1 is a schematic plan view for explaining an embodiment of the cleaning sheet of the present invention. FIG. 2 is a schematic enlarged schematic view of region X in FIG. FIG. 3 is a schematic diagram for schematically explaining the use state of the mop to which the cleaning sheet is attached.

(Cleaning sheet 1)
The cleaning sheet 1 of the present invention is composed of a nonwoven fabric 2 having an aperture 3 (FIGS. 1 and 2).

(Nonwoven fabric 2)
The nonwoven fabric 2 is formed by entanglement of a large number of fibers. As the nonwoven fabric 2, a spunlace nonwoven fabric composed of a large number of short fibers (staples (usually fibers having a length of about 15 mm to 100 mm)) is used. The nonwoven fabric 2 is not particularly limited in the basis weight and thickness, but in order to ensure the dust removal performance as the cleaning sheet 1, the basis weight is 10 to 200 g / m ^2. Those having a thickness of 0.01 to 3 mm are preferred.

The thickness (fineness) of the fibers constituting the nonwoven fabric 2 is preferably 0.5 to 3 dtex. The fibers preferably have a maximum cross-sectional diameter in the range of 5 to 30 μm, and the ratio of the maximum cross-sectional diameter to the minimum cross-sectional diameter is preferably 1 or more and 3 or less. The maximum cross-sectional diameter and the minimum cross-sectional diameter of the fiber indicate the maximum diameter and the minimum diameter of the cut surface that appears when the fiber is cut along a plane whose normal is the longitudinal direction of the fiber. The same applies to the maximum cross-sectional diameter and the minimum cross-sectional diameter of the fiber 4 that crosses the aperture 3 described later. Examples of the fibers constituting the nonwoven fabric 2 include fibers made of resin such as polypropylene, polyethylene, and polyethylene terephthalate, and those made into a sheath-core type or side-by-side type composite fiber. The nonwoven fabric 2 may be impregnated with various chemical solutions. However, when the nonwoven fabric 2 is impregnated with a chemical solution, as the fibers constituting the nonwoven fabric 2, fibers having good liquid retention properties such as rayon and cotton are used. May be used. At this time, it is preferable to use, as the fibers constituting the nonwoven fabric 2, composite fibers of these fibers having good liquid holding properties such as rayon and the above-described resin fibers such as polypropylene. In addition, as a chemical | medical solution impregnated to the nonwoven fabric 2, the solution which melt | dissolved chemical | medical agents, such as a cleaning agent, antiseptic | preservative, and disinfectant, in solvents, such as water, can be illustrated concretely.

(Opening part 3)
In the nonwoven fabric 2, an opening 3 is formed in a region (cleaning surface forming region) pressed against the surface to be cleaned at the time of cleaning. From the viewpoint of improving the dust removal performance of the nonwoven fabric 2, a large number of the opening portions 3 are preferably formed in the cleaning surface forming region of the nonwoven fabric 2 (FIG. 1). The arrangement pattern of the apertures 3 is not particularly limited, such as a lattice shape or a zigzag shape, and may be formed at random.

The shape of the opening 3 is not particularly limited, such as a perfect circle or an ellipse. The shape of the opening 3 may be indefinite. Moreover, the fiber 4 which crosses the inside of the opening part 3 exists in the opening part 3 (FIG. 2). It is preferable that the opening part 3 has fibers 4 that traverse the inside of the opening part 3 so as to connect two points that bisect the circumference. The fiber 4 is a fiber constituting the nonwoven fabric 2. When a large number of apertures 3 are formed in the nonwoven fabric 2, at least a part of the apertures 3 includes fibers 4 traversing the apertures 3.

The number of fibers 4 crossing the aperture 3 is not particularly limited, but is preferably 1 or more and 40 or less. If there is no number of fibers 4 crossing the opening 3, there is a possibility that the problem of dust penetration will not be solved. On the other hand, if the number of fibers 4 crossing the aperture 3 is too large, the aperture 3 may be more than half-closed by the fibers 4 and the aperture 3 may not be visually confirmed. is there. In addition, that the opening part 3 can be confirmed visually means that a state where the outline of the opening part 3 can be visually recognized is maintained, and at the position where the opening part 3 is formed, from one surface of the nonwoven fabric 2. It shall show that the state which can visually recognize the space of many sides is maintained.

It is preferable that the maximum diameter W of the aperture 3 is 80 times or more and 300 times or less the maximum cross-sectional diameter of the fiber 4 crossing the aperture 3. That is, when the maximum diameter of the aperture 3 is W (mm) and the cross-sectional maximum diameter of the fiber 4 is R (μm), the relationship may be 80 ≦ (W × 1000 / R) ≦ 300. preferable. In addition, the maximum diameter W of the opening part 3 shows the maximum value of the opening width of the opening part 3 in planar view of the nonwoven fabric 2 (FIG. 2).

Since the maximum diameter W of the aperture 3 is 80 times or more the maximum cross-sectional diameter of the fiber 4 that crosses the aperture 3, the fiber 4 that crosses the aperture 3 can move easily during cleaning. Dust can be effectively captured by the hole 3 and the fiber 4. Further, since the maximum diameter W of the aperture 3 is 300 times or less the maximum cross-sectional diameter of the fiber 4 crossing the aperture 3, the dust passes through the aperture 3 of the nonwoven fabric 4 and is on the opposite surface. The possibility of falling out to the side can be effectively prevented.

The maximum diameter W of the opening 3 is not particularly limited, but is preferably larger than a relatively large size of dust and not exceeding 2 to 4 times. The relatively large size dust is dust having a maximum diameter of about 0.4 mm to about 1.4 mm. Specifically, the maximum diameter W of the aperture is preferably 1 mm or more and 3 mm or less. When the maximum diameter W of the opening is 1 mm or more, a relatively small size dust (dust having a maximum diameter in the range of about 0.4 mm to about 0.7 mm) is more reliably wiped off. If the maximum diameter W of the opening is 3 mm or less, the larger one among the relatively large dusts (dust having a maximum diameter in the range of about 0.7 mm to about 1.4 mm) can be obtained. Can be wiped off reliably.

In addition, when many opening parts 3 are formed in the nonwoven fabric 2, the value of the number of the fibers 4 which cross | intersect the above-mentioned opening part 3 chooses ten places of the opening parts 3 at random, and is every one place. If the number of openings 3 formed is 9 or less, it is assumed to be the arithmetic average value of the numerical values measured for all the formation locations. Further, the magnification of the maximum diameter W of the aperture 3 with respect to the cross-sectional maximum diameter of the fiber 4 and the value of the maximum diameter W of the aperture 3 are also the case of the value of the number of fibers 4 crossing the aperture 3. It is assumed that the arithmetic average value is similarly derived.

(Manufacture of cleaning sheet 1)
The cleaning sheet 1 can be manufactured by using a known spunlace method. That is, a large number of fibers constituting the nonwoven fabric 2 are made into a web by a card machine, and this web is placed on the surface (mounting surface) of a support having holes, and high pressure is applied from the web side toward the web. The nonwoven fabric 2 is obtained by applying a water stream to entangle the fibers (entangle them) and dry the entangled web of fibers. In addition, the hole part of a support body is formed in the mounting surface by the pattern corresponding to the pattern of the opening part 3 which is going to form in the nonwoven fabric 2. FIG. And the opening part 3 is formed in the nonwoven fabric 2 by the pattern corresponding to the hole part of a support body. The shape and maximum diameter of the aperture 3 and the number of fibers 4 crossing the aperture 3 can be adjusted by appropriately adjusting the aperture diameter of the aperture of the support, the pressure of the high-pressure water flow applied to the web, and the amount of water. Adjusted. In addition, a short fiber is used for the fiber used when forming a web.

(Mop 10 using cleaning sheet 1)
The cleaning sheet 1 is used by being attached to a base 11 of the mop 10. For example, for a mop jig in which the base 10 is attached to the tip of the handle 12, the cleaning sheet 1 is applied to the bottom surface of the base 11, and the end of the cleaning sheet 1 is rolled up above the base 11. The cleaning sheet 1 is fixed to the base 11 by fixing the end portion of the cleaning sheet 1 with the locking piece 13 on the upper surface of FIG. 3, and the mop 10 is obtained (FIG. 3).

Next, an example will be used to explain.

Examples 1 to 8
(Preparation of non-woven fabric)
In Examples 1 to 8, fibers (short fibers having an average fiber length of 30 mm) made of polyethylene terephthalate (PET) having fineness and fiber diameter (cross-sectional maximum diameter R (μm)) as shown in Table 1 were prepared. A non-woven fabric having an aperture was prepared. As the nonwoven fabric, a spunlace nonwoven fabric was adopted for any of the examples, and the above-mentioned spunlace method was used for the preparation of these spunlace nonwoven fabrics. That is, for each of the examples, the prepared fibers were carded using a card machine to create a web. The web was then placed on a support base. As the support base on which the web was placed, a support base having a plurality of holes formed in a grid-like arrangement pattern on the placement surface was used. And the pressurized water flow was injected from the upper side of the web with respect to the web on a support stand, and the fibers were entangled. The injection conditions of the pressurized water flow were appropriately selected for each of Examples 1 to 8. Thereafter, the entangled fibers were dried in a dryer to obtain a spunlace nonwoven fabric in which apertures were formed in a lattice pattern. For any of the spun lace nonwoven fabrics of Examples 1 to 8, the dimensions are 210 mm long × 310 mm wide, 0.8 mm thick, and the arrangement pattern and number of the apertures are lattice-like 20 vertical / 1 row × 40 horizontal / One row, basis weight was 46 g / m ² .

Table 1 shows the maximum diameter of the opening and the number of fibers crossing the opening for each of the nonwoven fabrics prepared in Examples 1 to 8. In addition, the maximum diameter (mm) of the opening part shown in Table 1, and the number (fiber) of the fiber which crosses an opening part are the values measured by the method shown next, respectively.

<Measurement of maximum diameter of hole>
The maximum diameter of the opening of the nonwoven fabric was measured as follows. First, 10 openings were selected at random, the selected openings were enlarged with a microscope (magnification: 50 times), and the maximum diameter (individual maximum diameter) (mm) was measured based on the enlarged plane image. . The individual maximum diameters were measured at 10 locations in the aperture, and the average value (arithmetic average value) of the individual maximum diameters was calculated. This arithmetic average value is the maximum diameter of the apertures in the nonwoven fabric.

<Measurement of the number of fibers crossing the aperture>
As for the number of fibers crossing the aperture of the nonwoven fabric, the value (number) of fibers traversing the aperture is measured for each of the 10 locations of the aperture as in the measurement of the maximum diameter of the aperture. And it was calculated as an arithmetic average value of those values. For the measurement of the value of the number of fibers traversing each aperture, an enlarged planar image (magnification: 50 times) similar to the measurement of the maximum diameter of the aperture was used.

(About cleaning sheets)
The spunlace nonwoven fabrics prepared in Examples 1 to 8 form the cleaning sheets in Examples 1 to 8, respectively. Next, using the cleaning sheets of Examples 1 to 8, tests and evaluations were carried out for dust capturing ability and dust penetration prevention ability as follows.

(Dust trapping properties)
For each of the cleaning sheets of Examples 1 to 8, a dust trapping test was performed. The dust trapping test was conducted by assembling a mop (indicated by reference numeral 10 in FIG. 3) equipped with a cleaning sheet and cleaning the dusted test surface using the mop (test cleaning). . And based on the result of the dust trapping property test, the dust trapping power of the cleaning sheets of Examples 1 to 8 was measured, and the dust trapping property was evaluated.

(Dust capture test)
First, before mounting the cleaning sheet on the mop 10, the mass (M1 (g)) of the cleaning sheet was measured. An electronic balance was used to measure the mass of the cleaning sheet.

<Mop assembly>
As shown in FIG. 3, a jig having a base 11 fixed to the tip of a rod-shaped handle 12 is prepared, the cleaning sheet 1 is applied to the base 11, and the edge of the cleaning sheet 1 is placed on the upper surface side of the base 11. It bent and the four edge parts of the cleaning sheet 1 were locked by the locking pieces 13 of the base 11. Thereby, the mop 10 with the cleaning sheet 1 mounted on the base 11 was obtained. The used jig base 11 is formed in a rectangular plate shape having a length of 100 mm, a width of 300 mm, and a thickness of 10 mm, and its bottom surface forms a smooth flat surface.

<Test cleaning>
A wooden plate was prepared as a flooring 14 that provides a test surface to be cleaned to perform test cleaning with the mop 10. A rectangular region (long side length 90 cm × short side length 30 cm) was defined in the surface of the flooring 14, and a surface designated in the region was used as a test surface. For convenience, the direction along the long side direction of the test surface is the vertical direction. In FIG. 3, the direction of the arrow FB is the vertical direction.

塵 Dust was sprinkled all over the test surface. The total mass (T (g)) of the dust that was sown was 0.5 g. Moreover, bread crumbs were used as dust. This bread crumb is composed of a large number of bread crumb particles having a particle diameter of 0.7 mm to 1.4 mm. Next, while pressing the cleaning sheet surface of the mop against the dusted test surface, move the mop in the vertical direction of the test surface (in the direction of arrow FB in FIG. 3) from one edge of the test area. The slide was reciprocated to the other edge. Such slide reciprocation of the mop was repeated three times (three reciprocations). Thereafter, the mop was gently lifted away from the test surface, the cleaning sheet was further removed from the mop, and the mass (M2 (g)) of the removed cleaning sheet was measured using an electronic balance.

A value obtained by subtracting M1 from M2 (M3 (g)) was calculated. This value indicates the amount of dust trapped on the cleaning sheet. Furthermore, the dust capture rate (%) was calculated using the values of M3 and T. The dust capture rate (%) is calculated by (M3) / T × 100.

In addition, about each cleaning sheet of Examples 1 to 8, three sheets were prepared as cleaning sheets for each Example. And the dust capture rate was calculated | required about each sheet | seat for cleaning prepared about one Example. And the arithmetic average value of those values was computed, and the average value (average capture rate (%)) was made into the value which shows the dust capture power of the cleaning sheet in the example.

(Evaluation of dust capture)
For each of the cleaning sheets of Examples 1 to 8, dust scavenging evaluation was performed based on the following evaluation criteria based on the average capture rate (%). The results are shown in Table 1.

“Very good”: Average capture rate (%) is 75% or more “Good”: Average capture rate (%) is 60% or more and less than 75% “Normal”: Average capture rate (%) is 50% or more and less than 60% “ "Poor": Average capture rate (%) is less than 50%

(Dust penetration prevention)
For each of the cleaning sheets of Examples 1 to 8, a dust see-through suppression confirmation test was performed.

(Dust penetration prevention confirmation test)
The dust see-through suppression confirmation test was performed by performing test cleaning on each of the cleaning sheets of Examples 1 to 8 using a mop equipped with the cleaning sheet described above. Then, after performing a test cleaning using the mop, remove the cleaning sheet from the mop with the mop bottom facing up, and visually check whether dust has adhered to the base of the base and the base has become dirty. did. In addition, if the pedestal is soiled, visually observe the degree of soiling on the bottom surface of the pedestal, and the recognized dirt area (the total area where dirt is recognized on the pedestal bottom surface) The percentage was confirmed.

In addition, about each cleaning sheet of Examples 1 to 8, three sheets were prepared as cleaning sheets for each Example. For each cleaning sheet prepared for each example, the presence or absence of dirt on the pedestal and the degree of dirt on the bottom surface of the pedestal were observed, and for each example, the average dirt area was about what percentage of the entire bottom surface of the pedestal. I confirmed that it was recognized.

(Evaluation of dust penetration prevention)
The degree of contamination on the bottom surface of the pedestal was classified into four levels based on the average amount of contamination on the bottom surface of the pedestal. And dust penetration prevention evaluation was carried out for each of the cleaning sheets of Examples 1 to 8 using the following evaluation criteria based on the average level of dirt on the bottom surface of the pedestal. . The results are shown in Table 1.

“Very good”: No dirt is observed on the bottom surface of the pedestal, or the dirty area is less than 2% of the entire bottom surface of the pedestal. “Good”: The dirty area is 2% to less than 10% of the entire bottom surface of the base. The area is 10% or more and less than 20% of the entire bottom surface of the pedestal.

The present invention is useful for use at home as a cleaning sheet for removing relatively large dust such as bread crumbs.

DESCRIPTION OF SYMBOLS 1 Sheet for cleaning 2 Nonwoven fabric 3 Opening part 4 Fiber W Maximum diameter of opening part

Claims

A cleaning sheet comprising a non-woven fabric having an aperture and fibers that cross the aperture.
2. The cleaning sheet according to claim 1, wherein the maximum diameter of the aperture is 80 to 300 times the maximum cross-sectional diameter of the fiber crossing the aperture.
The cleaning sheet according to claim 1 or 2, wherein the maximum diameter of the aperture is 1 mm or more and 3 mm or less.