JPH11295A - Cleaning sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To collect kinds of dust by laminating a net-like sheet and a fiber web including a specific quantity of extremely fine fiber of fineness lower than a specific value and entangle-integrating these by stream entangling, etc., under a low energy condition. SOLUTION: A fiber aggregate 3 in the state of a nonwoven fabric, which is formed by the fiber entangling of the fiber web containing more than 50 wt.% extremely fine fiber of lower than 0.9 denier fineness, is formed on one side or both sides of the net-like sheet 2 of a polyester group such as polyethylene, polypropylene, polybutene consisting of a grid-shaped net. Then, the aggregate 3 is integrated in an entangled state also to the sheet 2 with entangling between its constituting fiber. Thereby, kinds of dust from dust on a general floor material to that on a desk and furniture of a smooth surface and a plastic product is collected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning sheet for business and household use in which a non-woven fabric is entangled with a net-like sheet, and more particularly, a non-woven fabric assembly mainly composed of specific fibers as the non-woven fabric. TECHNICAL FIELD The present invention relates to a dry cleaning sheet capable of collecting various dusts by using a body. The cleaning sheet is, in particular, a cleaning tool for replacing a cleaning sheet and a handheld cleaning device for replacing a cleaning sheet. Used effectively for type cleaning tools.

[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. Also, the performance of collecting dust on resin-coated desks, furniture, and plastic products was insufficient.

[0004] Further, Japanese Patent Application Laid-Open No. 4-9, filed by the present applicant, is disclosed.
Japanese Patent No. 6724 discloses a cleaning article comprising an entangled nonwoven fabric in which ultrafine fibers having a density of less than 0.8 denier and fibers having a density of 0.8 denier or more are mixed irregularly, and the weight ratio is 99/1 to 1/99. According to the publication, the cleaning article can collect small dust such as soil dust without using an oil agent, and can remove hair and large dust without increasing the friction coefficient with a cleaning surface. It states that it can be entangled.

However, since the cleaning articles described in the above-mentioned publications are composed of only the above-mentioned two types of fibers, sufficient strength can be obtained if the entanglement is made low in order to maintain the dust collecting performance. In addition, in order to impart sufficient strength, the entangled state must be densely formed, and it is difficult to exhibit sufficient collection performance, and it is difficult to collect various dusts.

Accordingly, an object of the present invention is to provide a cleaning sheet capable of satisfying both the strength required at the time of cleaning and the degree of freedom of fibers required for dust collecting performance, and more specifically, a general cleaning sheet. Effectively used for cleaning sheets that can collect various types of dust, from dust on flooring to dust on desks, furniture and plastic products with a smooth surface, especially cleaning tools with a replaceable cleaning sheet. To provide a cleaning sheet.

[0007]

Means for Solving the Problems As a result of intensive studies, the present inventors have laminated a net-like sheet and a fiber web containing a specific amount of ultrafine fibers having a fineness of not more than a specific value, and these are laminated under low energy conditions. It has been found that a sheet entangled and integrated by water entanglement (water needling) or the like can achieve the above object.

[0008] The present invention has been made based on the above findings, and a nonwoven fabric formed by fiber entanglement of a fibrous web containing 50% by weight or more of ultrafine fibers having a fineness of 0.9 denier or less on one or both sides of a mesh sheet. It is an object of the present invention to provide a cleaning sheet composed of a sheet in which a fiber aggregate having a shape is entangled with the mesh sheet together with the entanglement between the constituent fibers thereof.

[0009] In a preferred embodiment of the present invention, the fiber aggregate has a fiber degree of freedom capable of entangling fibrous dust with constituent fibers of the fiber aggregate and holding the entangled dust between the constituent fibers. In a low entanglement state.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The cleaning sheet of the present invention is described below.
The preferred embodiment will be described in detail. FIG. 1 is an enlarged sectional view showing an embodiment of the cleaning sheet of the present invention, and FIG.
FIG. 2 is an enlarged plan view of a mesh sheet used for the cleaning sheet shown in FIG. 1.

As shown in FIG. 1, the cleaning sheet 1 of the present embodiment has a nonwoven fabric aggregate 3 and 3 formed on both sides of a mesh sheet 2 shown in FIG.
However, it is a sheet integrated with the mesh sheet 2 in an entangled state together with the entanglement between the constituent fibers.

The net-like sheet 2 in the cleaning sheet 1 according to the present embodiment is composed of a grid net as shown in FIG. The wire diameter of the mesh sheet 2 is preferably 20 μm.
m to 500 μm, more preferably 100 μm to 200 μm
m. The distance between the lines is preferably 2 mm to 30 mm.
mm, more preferably 4 mm to 20 mm.

The material of the mesh sheet 2 is preferably
Polyolefins, for example, polyethylene, polypropylene, polybutene, etc., polyesters, for example, polyethylene terephthalate, polybutylene terephthalate, etc., polyamides, for example, nylon 6, nylon 66, etc., acrylonitrile, vinyl and vinylidene, for example, polyvinyl chloride, polyvinyl chloride It can be appropriately selected from vinylidene and the like, or denatured products, alloys, mixtures thereof and the like.

The mesh sheet used in the cleaning sheet of the present invention may be a perforated film having a large number of holes, and has a certain number of holes, and is entangled with a fiber web forming the fiber aggregate. The carrier is not particularly limited as long as it can be integrated in a state. For example, a coarse woven fabric having a relatively large texture space such as a gauze-like woven fabric, or a nonwoven fabric having a fiber void that can be integrated in an entangled state by superimposing a fiber web on one or both surfaces, Used as the mesh sheet.

The fiber aggregates 3 in the cleaning sheet 1 of the present embodiment are made of a nonwoven fabric formed by fiber entanglement of a fiber web containing 50% by weight or more of ultrafine fibers having a fineness of 0.9 denier or less. Shape. The fiber assembly 3
The content of the ultrafine fibers in the fiber web (the fibrous aggregate) used in the present invention may be 50% by weight or more, preferably 70% by weight or more, and more preferably 90% by weight or more. When the content of the ultrafine fibers is less than 50% by weight, the performance of collecting dust by the ultrafine fibers is reduced. The fineness of the ultrafine fibers is preferably 0.8 denier or less, more preferably 0.5 denier or less, and the fiber length is preferably 20 to 100 mm, more preferably 30 to 65 mm.
It is. In addition, the fiber cross-sectional shape, the crimp rate, and the like of the ultrafine fiber are determined by comprehensively considering workability, cost, and the like.

In the cleaning sheet of this embodiment, the fiber aggregate is entangled on both sides of the net sheet, but may be entangled on one side. In addition, as the fibers other than the ultrafine fibers constituting the fiber web (fiber aggregate), those having a fineness of 1.0 to 6.0 denier and a fiber length of 20 to 100 mm are preferably used. It is more preferable to use one having 3.0 denier and a fiber length of 30 to 65 mm.

The fibers used in the fiber assembly 3 include thermoplastic fibers such as polyester and polyamide, composite fibers thereof, semi-synthetic fibers such as acetate, regenerated fibers such as cupra and rayon, and cotton. Or any of natural fibers, such as mixed cotton. Further, in order to improve the surface physical properties, an oil agent component that adsorbs dust and the like may be appropriately added to the nonwoven fabric fiber aggregate. However, it is preferable that the amount of the oil agent applied at this time is an amount that does not seep out from the non-woven fabric fiber aggregate in large amounts or migrate to the cleaning target surface in a large amount. By forming the fiber aggregate using ultra-fine fibers of 0.9 denier or less, it is possible to improve large dust, particularly the entanglement of hair, and even if an oil component is applied, they are hardly exuded, Since it is difficult to transfer a large amount to the cleaning surface, the applied amount of the oil agent can be increased, and as a result, the amount of adsorbed dust can be further increased.

Further, the basis weight of the nonwoven fiber aggregate in the cleaning sheet of the present invention is preferably from 30 to 100 g / m ^2, more preferably 40~70g / m ^2. If the basis weight of the fiber aggregate is less than 30 g / m ² , dusts can easily escape to the back side of the sheet when used as a cleaning sheet, and hands and the like may be stained during cleaning. Further, when the basis weight of the fiber aggregate exceeds 100 g / m ² , the fiber and the reticulated sheet are not sufficiently entangled with each other at a desired entanglement coefficient, so that a cleaning sheet is obtained in which the processability is deteriorated and the fiber easily falls off. Will be.

The density of the nonwoven fabric aggregate in the cleaning sheet of the present invention is 0.015 to 0.200 g.
/ Cm ³ is preferable, 0.030~0.100g / cm
³ is more preferred. The density of this fiber aggregate is 0.015
If it is less than g / cm ³ , the entangled state between the fibers will be too low, and if it exceeds 0.200 g / cm ³ , the entangled state between the fibers will be too high and the voids between the fibers will be too small.

In the cleaning sheet of the present invention, the degree of entanglement between the constituent fibers of the fiber aggregate is important, and this degree is determined by the entanglement energy applied to the fiber web during the entanglement treatment. Then, in order to set the degree to a desired entangled state, that is, to set the basis weight and the density of the fiber aggregate in the respective ranges described above, it is preferable to perform the entanglement by hydroentanglement (water needling). According to water needling, the type of fiber,
The entanglement energy applied to the fiber web can be controlled by the conditions such as the basis weight of the fiber web, the number of water jet nozzles and the water pressure, and the line speed. A low entanglement state can be achieved.

Further, the cleaning sheet of the present invention has a breaking strength of 5 N / 30 mm or more, an elongation under a load of 5 N / 30 mm of 20% or less, and a confounding coefficient of 0.1 to 5 N · m /
g is preferable. Here, the breaking strength is defined as a load value at which the cleaning sheet of the present invention starts to break when a tensile load is applied thereto (the first value at the time of measuring the tensile strength).
Peak value), and the above elongation indicates that this load value is 5 N / 30.
It shows the elongation percentage of the cleaning sheet when mm.

The above-mentioned entanglement coefficient is a measure of the state of entanglement between the constituent fibers, and is the initial gradient of the stress-strain curve in the direction perpendicular to the fiber orientation in the nonwoven fabric aggregate of the cleaning sheet. It can be said that the smaller the value, the weaker the entanglement between the fibers. At this time, the stress indicates a value obtained by dividing the tensile load value by the grip width (the width of the test piece at the time of measuring the tensile strength) and the basis weight of the nonwoven fabric aggregate, and the strain indicates elongation.

If the breaking strength is less than 5 N / 30 mm, the cleaning sheet may be broken during the wiping operation, and the elongation of the cleaning sheet is preferably low, preferably 5 N / 3.
If the elongation at a load of 0 mm exceeds 20%, the cleaning sheet may be distorted during the wiping operation, and may be distorted or the like, and the usability may be deteriorated. These problems are due to the fact that the cleaning sheet is
This is remarkable when performing a wiping operation by attaching to a cleaning sheet replacement type cleaning tool described in, for example, -119152.

When the confounding coefficient represented by the initial gradient of the stress-strain curve in the direction perpendicular to the fiber orientation in the fiber assembly is set to 5 Nm / g or less like the cleaning sheet of the present invention, It is difficult to achieve the above values of the breaking strength and the elongation with the aggregate alone, and in order to achieve such values, it is important to entangle and integrate the mesh sheet and the fiber aggregate as in the present invention. It is. Further, in the cleaning sheet of the present invention, in the same low entangled state, the fiber aggregate is entangled and integrated with the mesh sheet as compared with the entangled sheet consisting of only the fiber aggregate, thereby, Since the elongation is kept low, the falling off of the fibers is significantly suppressed.

When the above-mentioned entanglement coefficient is less than 0.1 N · m / g, the inter-fiber or the fiber and the reticulated sheet are not sufficiently entangled.
As a result, a nonwoven fabric from which fibers are easily dropped can be obtained. Also,
If the entanglement coefficient exceeds 5 N · m / g, the entanglement is too strong and the degree of freedom of the fiber is not sufficient, so that the fibers are less likely to be entangled with dust and the dust collecting performance is reduced. In the preferred embodiment of the present invention described above, the fiber aggregate has a fiber degree of freedom in which fibrous dust is entangled with the constituent fibers of the fiber aggregate and the entangled dust can be held between the constituent fibers. In a low entanglement state.

The cleaning sheet is preferably provided with 0.1 to 40% by weight, more preferably 0.5 to 30% by weight, of an oil component based on the fiber assembly. If the amount of the applied oil agent is less than 0.1% by weight, the improvement in the amount of dust adsorbed by the oil agent component cannot be said to be sufficient, and if it is more than 40% by weight, the oil agent component stains from the fiber aggregate. It may come out and transfer to the surface to be cleaned in large quantities, or it may stick to hands and feel sticky. The oil component preferably contains at least one or more of mineral oil, synthetic oil, silicone oil and surfactant. Examples of the mineral oil include paraffinic hydrocarbons, naphthenic hydrocarbons, and aromatic hydrocarbons. Examples of the synthetic oil include alkylbenzene oil, polyolefin oil, and polyglycol oil. Examples of the silicone oil include chain dimethylpolysiloxane, cyclic dimethylpolysiloxane, methylhydrogenpolysiloxane, and various modified silicones. Can be Examples of the surfactant include nonionic, cationic, anionic, and amphoteric surfactants, depending on the type of fiber used in the fiber assembly and the type of other oil agent used in combination. Used as appropriate. The viscosity of the oil component is 5 at 20 ° C.
1500 mPa · s is preferable, and 40 to 1300 mPa
・ S is particularly preferred. If the viscosity is lower than 5 mPa · s, the oil component tends to exude during cleaning,
If it is higher than a · s, the permeability of the oil agent component to dust may be low, and the amount of adsorbed dust may decrease.

[0027]

The present invention will be described below in detail with reference to examples. Example 1 As a mesh sheet, a polypropylene grid net (line distance 8 mm, wire diameter 0.2 mm) was used.
Polyester fibers (fineness 0.8
Denier, fiber length 38mm) with standard card 48
g / m ² , and then subjected to a water needling treatment under low energy conditions, so that the nonwoven fabric aggregate formed by the fiber entanglement of the fiber web is entangled between its constituent fibers. A sheet integrated in an entangled state with the mesh sheet together with the mesh (thickness: 0.9 mm, breaking strength: 18 N / 30 mm, elongation under load of 5 N / 30 mm 5%, fiber aggregate density: 0.053 g / cm ³ and a confounding coefficient of 0.72 Nm / g). Furthermore, in the obtained sheet,
5% by weight of liquid paraffin (viscosity: 130 mPa · s) was applied to the fiber aggregate of the sheet by gravure coating to obtain a cleaning sheet (see Table 1).

Example 2 As a net-like sheet, a polypropylene grid net (line-to-line distance 8 mm, wire diameter 0.2 m)
m), 70% of polyester fiber (fineness: 0.8 denier, fiber length: 38 mm) and polyester fiber (fineness: 1.5 denier, fiber length: 51 mm) above and below the mesh sheet
30% and fully mixed with a standard card to give a basis weight of 48 g /
After laminating so as to obtain a fiber web of m ² , a water needling treatment was performed under the same low energy conditions as in Example 1, and a nonwoven fabric aggregate formed by fiber entanglement of the fiber web was used as a constituent fiber. The sheet (thickness 0.9) integrated in an entangled state with the mesh sheet together with the entanglement between
mm, breaking strength 18 N / 30 mm, elongation at 5 N / 30 mm load 5%, fiber aggregate density 0.053 g / cm ³ ,
A confounding coefficient of 0.68 Nm / g) was obtained. Further, 5% by weight of liquid paraffin (viscosity: 130 mPa · s) based on the fiber aggregate of the sheet was applied to the obtained sheet by gravure coating to obtain a cleaning sheet (Table 1). reference).

[Comparative Example 1] As a net-like sheet, a grid-like net of polypropylene (line-to-line distance 8 mm, wire diameter 0.2 m)
m), polyester fibers (denier 1.5 denier, fiber length 51 mm) are laminated on the upper and lower sides of the mesh sheet with a conventional card so as to obtain a fiber web with a basis weight of 48 g / m ² , and then under low energy conditions. (Slightly higher than in Example 1), and subjected to a water needling treatment, with a thickness of 0.8 mm, a breaking strength of 18 N / 30 mm, an elongation at a load of 5 N / 30 mm of 5%, a fiber aggregate density of 0.060 g / cm ³ , A sheet having a confounding coefficient of 0.70 Nm / g (Comparative Example 1) was obtained (see Table 1). Comparative Example 2 5% by weight of liquid paraffin (viscosity of 130 m) was added to the sheet of Comparative Example 1 based on the fiber assembly.
Pa.s) was applied by gravure coating to obtain a sheet (Comparative Example 2) (see Table 1).

The fiber assembly density is as shown in the following [fiber assembly density], and the entanglement coefficient is a value measured by the following measurement method. [Fiber aggregate density] The fiber aggregate density is a value obtained by dividing the fiber aggregate weight by the fiber aggregate thickness. At this time, the thickness of the fiber aggregate is the thickness of the entangled and integrated sheet excluding the net-like sheet portion. However, when a grid-like net as shown in FIG. The thickness of the integrated sheet is used. For thickness measurement, use Peac
Using ockUpright Dial Gauge, load 0.68N / 25
The measurement was performed at cm ² (pressure 272 Pa).

[Measurement Method of Entanglement Coefficient] In a non-woven fiber aggregate of a sheet (a net-like sheet portion is extracted), a sample having a width of 15 mm is cut out in a direction perpendicular to the fiber orientation, and the sample is cut by a tensile tester to a thickness of 50 mm. Of 30 mm / in the direction perpendicular to the fiber orientation.
The sheet is pulled at a speed of min, and the tensile load value with respect to the elongation of the sheet is measured. Then, the tensile load value F [N] is changed to the sample width [m] and the basis weight W [g / m of the nonwoven fabric aggregate.
² ], a stress-strain (elongation) curve is determined as stress S [Nm / g]. Stress S [Nm / g] = (F / 0.015) / W In the nonwoven fabric aggregate composed of only entangled fibers, a linear relationship is established at the beginning of the stress-strain curve, and the slope of the straight line is defined as It is obtained as a confounding coefficient E [Nm / g]. For example, the stress shown in FIG. 3 - in strain curve, proportional limit and P, the stress in the P and S _P strain gamma _P, confounding factor is given by E = S _P / _{γ P.} ( _Sp =
When 0.60 Nm / g and γ _p = 86%, E = 0.
60 / 0.86 = 0.70 Nm / g) However, since this OP may not be strictly a straight line, in this case, it is necessary to approximate a straight line.

[0032]

[Table 1]

The evaluation of the hair collecting properties shown in Table 1 above was performed according to the following [Measurement Methods] 1 to 3 and evaluated according to the following [Evaluation Methods]. [Measurement method] (1) 10 cm on the surface A to C 30 cm x 30 cm to be cleaned
5 cm of hair (straight hair having a diameter of about 100 μm) are sprayed. (2) A sheet was attached to a cushion material having a surface of 7 cm × 14 cm, and 1.96 was placed on the sprinkled hair.
Perform 5 reciprocations with a load of N and a stroke width of 30 cm. (3) The number of hairs sufficiently entangled in the sheet is defined as the number of collected hairs (however, hairs attached by static electricity or the like are excluded). [Evaluation Method] The collected hair is removed, and the operations of 1 to 3 are repeated 10 times, and the collection rate is calculated from the number of collected hairs for the sprayed hair, and the evaluation is performed. ◎: No problem at all ○: Almost no problem at all △: Not enough at all ×: Little at all

The evaluation of the soil dust collecting property shown in Table 1 above was as follows.
It measured according to the following [measurement method] 4-6, and evaluated by the following [evaluation method]. [Measurement Method] (4) Spray 0.1 g of seven kinds of JIS test dust uniformly on the surface to be cleaned C30 cm × 30 cm. (5) The seat is attached to a cushion material having a size of 7 cm × 14 cm, and the dust that has been sprayed is cleaned with a load of 1.96 N. (6) Measure the amount of dust collected and held on the sheet. [Evaluation method] The operations 4 to 6 are repeated five times using a new sheet, and the collection rate is calculated from the collection and retention amounts with respect to the sprayed amount, and the evaluation is performed. ◎: No problem at all ○: Almost no problem at all △: Not enough at all ×: Little at all

From the results shown in Table 1 above, Examples 1 and 2
According to the cleaning sheet of Example 1, the collection property is excellent for the hair on any of the surfaces A to C to be wiped, whereas the sheets of Comparative Examples 1 and 2 have a smooth surface (B , C) shows that the collecting property is poor for the upper hair. In addition, according to the cleaning sheets of Examples 1 and 2, the collection property is good for soil dust on the surface C, whereas the sheet of Comparative Example 1 has poor collection property. I understand. In addition, none of the sheets of Examples 1 and 2 and Comparative Examples 1 and 2 did not cause fiber detachment (fiber detachment property: ○).

[0036]

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, it can collect various kinds of dust, from dust on general flooring materials to dust on desks, furniture and plastic products with a smooth surface. Used effectively.

[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 plan view of a mesh sheet used for the cleaning sheet shown in FIG.

FIG. 3 is a characteristic diagram of a stress-strain curve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cleaning sheet 2 Reticulated sheet 3 Fiber aggregate

Claims (5)

[Claims] 1. A nonwoven fabric aggregate formed by fiber entanglement of a fibrous web containing 50% by weight or more of ultrafine fibers having a fineness of 0.9 denier or less on one surface or both surfaces of a reticulated sheet. A cleaning sheet comprising a sheet integrated in an entangled state with the mesh sheet together with the entanglement therebetween. 2. The cleaning sheet according to claim 1, which has a breaking strength of 5 N / 30 mm or more. 3. The cleaning sheet according to claim 1, wherein the elongation under a load of 5 N / 30 mm is 20% or less. 4. The oil agent component is added to the fiber assembly in an amount of 0.1%.
The cleaning sheet according to claim 1, which is provided in an amount of 1 to 40% by weight. 5. The fiber aggregate in a low entangled state having a degree of fiber freedom capable of entangling fibrous dust with constituent fibers of the fibrous aggregate and holding the entangled dust between the constituent fibers. The cleaning sheet according to claim 1.