JPH09276193A - Sheet for cleaning - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a sheet for cleaning which is usable effectively for wiping of water or spilled water and features good productivity by laminating fiber webs consisting of synthetic fibers on one or both surfaces of a web consisting of hydrophilic fibers or water absorptive sheet and integrating both layers to each other in an interconnected state. SOLUTION: The fiber webs 3 consisting of the synthetic fibers are laminated on the one or both surfaces of the web 1 consisting of the hydrophilic fibers 2 or the water absorptive sheet and both layers are integrated to each other in the interconnected state without adhering the synthetic fibers of both layers to each other. The web 1 consisting of the hydrophilic fibers 2 or the water absorptive sheet of such sheet for cleaning and the fiber webs 3 consisting of the synthetic fibers 4 are adequately integrated to each other by a spun lace method or needle punch method. The mixing ratio of the hydrophilic fibers 2 in the thickness direction of the sheet is preferably provided with a gradient smaller toward the front surface side to confine the ratio of the hydrophilic fibers 2 existing on the front surface of the sheet to <=60%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a commercial or household cleaning sheet using a nonwoven fabric.

[0002]

2. Description of the Related Art Conventionally, mops having a handle attached to a filament are generally used as a cleaning article for removing dirt on the floor. These are roughly classified into two types, one for dry wipes and one for water wipes. The former is one in which a filamentous material is impregnated with an oily substance called a dust control agent, which adsorbs and holds dust by utilizing the viscosity of the oily substance, and the latter is rubbed by rubbing the filamentous material with water, Although the stain is transferred to the filamentous material, in any case, when the filamentous material is contaminated by use, it must be reused by washing and the like, which is troublesome. Further, in order to solve the above-mentioned inconvenience, some cleaning mops are rented, but in this case, even if the cleaning part becomes dirty, it must be used until the collection date. It was hygienic.

Further, in recent years, a cleaning unit formed of a disposable nonwoven sheet has been put on the market. This is simple and hygienic because a new sheet can be used by replacing the sheet when the cleaning section becomes dirty due to use. However, the nonwoven fabric used as such a disposable sheet for dry wipes is generally meltblown or spunlace of synthetic fibers, etc., and since it does not absorb water, it is suitable for cleaning a dry floor, It was difficult to use when water was present. On the other hand, although it is considered to use a disposable sheet also for a mop for wiping water, since most of the sheet is a non-woven fabric or paper mainly composed of pulp, rayon or the like, friction with a floor surface increases due to water absorption,
The floor surface did not move smoothly during use, and the mop head was reversed, making it difficult to use.

Therefore, the present inventors have previously developed a cleaning sheet in which a fiber web composed of hydrophilic fibers and crimpable synthetic fibers is integrated in an entangled state. The cleaning sheet can be used not only in dry cleaning but also in combination with a floor polish which is being used more and more with an increase in flooring. However, the sheet contains hydrophilic fibers and crimpable synthetic fibers mixed in a fixed ratio, so if the ratio of the hydrophilic fibers is simply increased to increase the water absorption amount,
Due to water absorption, the frictional force with the floor surface increases, and movement on the floor surface tends to become unsmooth. Therefore, when considering increasing the water absorption amount, some consideration must be given to this point.

On the other hand, the upper and lower layers of fluff pulp covered with an air-through non-woven fabric of synthetic fiber are put on the market. Although this fluff pulp absorbs moisture, the part that is in direct contact with the floor surface is a synthetic fiber non-woven fabric, so the moisture will only pass through and the frictional force with the floor surface will not increase, making it easy to use. However, since it is dedicated to wiping with water and is composed of various materials in combination, the number of steps is large and it is difficult to manufacture.

[0006]

The technical problem of the present invention is that the cleaning sheet can be effectively used not only for the performance of removing dust in dry cleaning but also for wiping with water or spilled water, and has good productivity. To provide.

[0007]

In order to solve the above problems, the cleaning sheet of the present invention comprises a web made of hydrophilic fibers or a water absorbent sheet having one or both sides laminated with a fiber web made of synthetic fibers. It is characterized in that both layers are integrated in an entangled state without adhering the synthetic fibers on the surface layer. In the above-mentioned cleaning sheet, it is preferable that a web made of hydrophilic fibers or a water absorbent sheet and a fiber web made of synthetic fibers are integrated by a spunlace method or a needle punch method. Further, in the thickness direction of the sheet, it is desired that the mixing ratio of the hydrophilic fibers has a small gradient on the surface side and the ratio of the hydrophilic fibers existing on the surface of the sheet is 60% or less.

In order to satisfy the dust removing performance at the time of dry wiping, it is necessary that the sheet sucks and holds the dust regardless of its size. For that purpose, it is effective that the inter-fiber distance can be changed by the movement of the fiber without defining the inter-fiber distance. As described above, the synthetic fibers of the surface layer are not adhered to each other, and the structure of the present invention in which the web of hydrophilic fibers or the water absorbent sheet is integrated with the fiber web of synthetic fibers in an entangled state, particularly spunlace The structure integrated by the method or the needle punch method is suitable as a nonwoven fabric that meets these conditions.

Further, in order to improve the water absorption of the sheet, it is effective to increase the mixing ratio of the water absorption fibers,
On the other hand, in order to reduce the friction with the floor surface when absorbing water, it is necessary to suppress the water retention property of the floor contact surface of the sheet and keep the surface in a dry state. The structure of the present invention in which a fiber web made of synthetic fiber is integrated with the surface layer of a web made of or a water-absorbent sheet is also suitable as a nonwoven fabric meeting these conditions. Further, the nonwoven fabric of the present invention in which a fiber web made of synthetic fiber is integrated with a web made of the hydrophilic fiber or a water absorbent sheet can be produced relatively easily in one step by the spunlace method or the needle punch method. Is.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The web of hydrophilic fibers in the present invention is preferably made of natural fibers such as pulp and cotton and recycled fibers such as rayon, but synthetic fibers may be used as long as they have water absorbability. It is possible to appropriately use those subjected to surface treatment with a hydrophilic substance, those introduced with hydrophilic groups, those subjected to microporous fiber treatment, and the like. Further, the water absorbent sheet in the present invention may be any sheet material having water absorbency, and for example, water absorbent paper, dry pulp nonwoven fabric, cellulose sponge sheet, urethane sponge sheet and the like are generally used. Further, for the purpose of improving water absorption, it is possible to blend a highly water-absorbing polymer into the hydrophilic fiber web or the water-absorbent sheet.

In the present invention, as the synthetic fibers forming the fibrous web, polyester fibers, polyolefin fibers, polyamide fibers, acrylic fibers, etc., which are single, composite or mixed, can be used.
Further, as the synthetic fiber in the present invention, a crimpable synthetic fiber that develops a three-dimensional crimp by heating can be used. The three-dimensional crimp referred to here is the fiber 1 in FIG.
Not only the spiral crimps such as No. 1 but also those that are bent in a two-dimensional direction by drawing a gentle curve like the fibers 12 in FIG. 2 or two-dimensional like the fibers 13 in FIG. It is meant to broadly include various crimps, such as those in which a twist is added to a mechanical bend, and is a term used to distinguish from mechanical crimps.

The crimpable synthetic fiber is, specifically, a fiber composed of two or more kinds of polymers having different heat shrinkage ratios, which are ethylene-propylene copolymer / polypropylene,
This is a combination of high-density polyethylene / polyethylene terephthalate, high-density polyethylene / polybutylene terephthalate, polyethylene terephthalate / modified polyester, polypropylene / polyethylene, polyolefin / polyamide, etc., which has an eccentric core-sheath cross-section structure or a side-by-side cross-section structure. Corresponds to.

The three-dimensional crimp can be developed at the fiber manufacturing stage or the nonwoven fabric manufacturing stage. That is, heat treatment may be performed at the final stage of the fiber production process to develop crimps, or heat treatment may not be performed in the fiber production process, and the nonwoven fabric may be subjected to heat treatment to develop crimps. Is also good. Among them, an ethylene-propylene random copolymer as a first component, polypropylene as a second component, a first component as a sheath component, a composite fiber having an eccentric core-sheath cross-sectional structure having a second component as a core component, or both. The composite fiber in which the components are bonded side by side has a very strong crimping ability,
A three-dimensional crimp can be developed simply by heating in an atmosphere of about 70 ° C., and thus it is preferably used. The number of crimps is preferably 10 to 20 per inch. Generally, large dust such as punctures and hair is difficult to hold between fibers because it greatly exceeds the distance between fibers of the nonwoven fabric, but this crimpable fiber is effective for trapping large dust due to its entanglement. It is something.

The basis weight of the cleaning sheet is 30 g / m
It is preferably ² or more, and the ratio of the hydrophilic fiber web or water absorbing sheet in the basis weight is 50 to 9
0% is preferred. If either of these is not satisfied, the water absorbency of the sheet is reduced, so that wiping marks are likely to remain, or the frictional force with the floor surface is increased, and the sheet cannot be moved smoothly.

As a method for forming a sheet by entanglement of fibers, a water needling method in which fibers are entangled with a water stream, and a needle punch method in which fibers are entangled are known. At the time of entanglement, the fibers are mixed at the boundary surface between the hydrophilic fiber and the synthetic fiber, and the fibers are expanded to the whole, but they are not completely mixed, and the mixing ratio of the hydrophilic fibers is decreased as the sheet surface is approached. It has a gradient. At this time, the ratio of hydrophilic fibers present on the sheet surface is 60%.
The following is preferred. If it exceeds 60%, the frictional force with the floor surface increases, which is not preferable.

The non-woven fabric sheet of the present invention can carry a dust control agent in order to improve the dust removal property when it is wiped dry. This dust control agent comprises an oil component such as a mineral oil, a synthetic oil, and a silicone oil, and a surfactant. As the mineral oil, paraffin hydrocarbons, naphthene hydrocarbons, aromatic hydrocarbons and the like are used, as the synthetic oil, alkylbenzene oil, polyolefin oil and the like, and as the silicone oil, dimethylpolysiloxane, Various modified silicones are used.

The above-mentioned surfactant is not particularly limited, but it is preferable that the surfactant is uniformly mixed with the oil component and does not interfere with the water absorption of the sheet. That is, HLB
Is 7 or more and 13 or less, and preferably 7 or more and 11 or less. For example, polyoxyethylene (3 to 9 mol) long chain alkyl or alkenyl ether, polyethylene glycol ether type such as polyoxyethylene (3 to 9 mol) alkylphenyl ether, polyoxyethylene (3 to 9 mol) long chain fatty acid ester , Polyoxyethylene polyoxypropylene block copolymers and the like. Further, a mono long-chain alkyl trimethyl ammonium salt, a di long chain alkyl dimethyl ammonium salt, a mono long chain alkyl dimethyl benzyl ammonium salt, etc., having an alkyl group or an alkenyl group having 10 to 22 carbon atoms, together with the above nonionic surfactant, By adding a cationic surfactant, it becomes possible to improve the adsorptivity of dust and impart antibacterial properties. A method for supporting the dust control agent on the non-woven fabric is generally a roll coater, spray coating, or the like, but is not particularly limited.

FIG. 4 schematically shows the structure of the above-mentioned cleaning sheet. A web 1 made of hydrophilic fibers 2 is laminated on both sides with a fiber web 3 made of synthetic fibers 4, and needles are provided between the two layers. It shows a state of being integrated by a punch method. A support may be used to impart strength to the cleaning sheet of the present invention. The support is not particularly limited as long as the fibers constituting the sheet can be integrated in an entangled state, but long fiber non-woven fabric manufactured by the spunbond method, a mesh sheet made of synthetic resin, a mesh shape Woven cloth is generally used. The position of the support in the sheet may be between fibers forming the sheet or on one side of the fibers forming the sheet, but when laminating on one side of the fibers, the non-use side is preferable.

[0019]

EXAMPLES The cleaning sheets of Examples 1 to 4 and Comparative Examples 1 to 6 shown below have the structures shown in Table 1 and explained below. Examples 1 to 4 and Comparative Example 1
The fibers A to C and the like used in Examples 1 to 5 are as follows.

[0020]

[Table 1]

A (synthetic fiber) a: ethylene-propylene random copolymer having a melting point of 140 ° C. as a first component and polypropylene having a melting point of 160 ° C. as a second component, fineness of 2 denier, fiber length of 51 m
A composite fiber having a side-by-side cross-sectional structure of m (14 three-dimensional crimps / inch). b: A single fiber having a fineness of 2 denier and a fiber length of 51 mm, which is made of polypropylene having a melting point of 162 ° C. (mechanical crimp 16
Pieces / 1 inch). B (hydrophilic fiber) c: Rayon fiber having a fineness of 1.5 denier and a fiber length of 40 mm. d: Fluff pulp. C (Water-absorbent sheet) e: Water-absorbent paper. f: Cellulose sponge sheet

In Examples 1 to 4 and Comparative Examples 1 to 3, after the web B formed by the parallel card or the web A formed by the parallel card was laminated on both sides of the sheet C, They were integrated by needle punching. Next, liquid paraffin 85
%, Polyoxyethylene (EO = 3) alkyl (C12
.About.C13) A dust control agent consisting of 15% ether was spray-coated at 5% based on the weight of the nonwoven fabric.

In Comparative Examples 4 and 5, fibers A and fibers B, which were web-shaped by a parallel card, were integrated by needle punching, and then 85% liquid paraffin and polyoxyethylene (EO = 3) alkyl ( C12-C13)
A dust control agent consisting of 15% ether was spray coated at 5% on the weight of the non-woven fabric. In Comparative Example 6, fluff pulp having a basis weight of 60 g / m ² and a melting point of 25
Fineness of 2.5 denier with a core component of 8 ° C. polyester and a sheath component of polyethylene with a melting point of 130 ° C., fiber length 51 m
m core-sheath type composite fiber, weight of 20 in parallel card
After forming a g / m ² fibrous web, it was sandwiched with a heat-through nonwoven fabric formed into a sheet at 150 to 160 ° C. using a hot-air penetrating dryer, and then four corners were heat-sealed.

The characteristics of these cleaning sheets are shown in Table 1, and the evaluation methods of these characteristics are as follows. Dust adsorptive property 1g of 7 kinds of test dust (JIS Z8901) is evenly dispersed on a 30 x 30cm flooring, and the sample is stuck and fixed on a 7 x 11cm sponge to make 10 reciprocations. Was measured. Dust retention property The sample after the dust adsorption property was dropped 10 times from a height of 30 cm, and the amount of dust still retained was measured.

Punks collecting ability 1g of commercially available dry bread crumbs was evenly spread on a 30 x 30 cm flooring, and a sample was attached to a 7 x 11 cm sponge and fixed to make 3 reciprocations. An evaluation was made. The evaluations by ○, △, and × are as follows. ◯: It is difficult to remove the punctures you took. Δ: Taken punctures may be dropped. X: It is easy to remove the punctures taken.

Hair-collecting property 30 × 30 cm flooring is sprinkled with 10 human hair cut to 10 cm so as not to overlap, and 7 × 11
The sample was attached to a cm sponge and fixed, and the sample was reciprocated 3 times, and sensory evaluation was performed on the ease with which the hair was taken and the difficulty in removing the hair. The evaluations by ○, △, and × are as follows. ◯: 8 to 10 hairs are taken, and it is difficult to remove the taken hair. Δ: 5 to 7 hairs are taken, but the taken hairs are easily removed. X: Do not take more than 5 hairs.

Friction with Floor Surface A sample was dipped in water, lightly squeezed, and then set on the head of a floor mop to make a sensory evaluation of the ease of movement of the head when the flooring was wiped. The evaluation by ◯ and × is as follows. ○: The head moves smoothly and no extra force is applied. ×: The head is caught on the floor surface and has a force to move.

Residue of Wiping Mark After the friction with the floor surface was evaluated, marks of water remaining on the flooring were observed. The evaluation by ◯ and × is as follows. ◯: There is no wipe mark. ×: There is a wipe mark.

According to these test results, Comparative Examples 1 to 6
In contrast, in Examples 1 to 4 of the present invention, it is understood that all of the measured characteristics are excellent.

Next, the relationship between the proportion of hydrophilic fibers present on the sheet surface and the friction with the floor surface when wiping with water is shown. The experimental sheet was prepared by laminating the web-shaped fibers A formed by the parallel card on both sides of the web-shaped fibers B formed by the parallel card, and integrating them by needle punching. The ratio of the hydrophilic fibers on the surface of the sheet is based on the frictional force of the non-woven fabric in which hydrophilic fibers and synthetic fibers are mixed at a constant ratio and entangled by the spunlace method.
It was created so that the frictional force could be obtained. The method of measuring the frictional force is as follows. That is, 50cc on the floor
Of water, and then head size 110 × 25
Set a sheet on a commercially available mop of 5 mm for 10
After reciprocating, a load of 3 kg was applied to the head to slide on the flooring with a push-pull gauge, and the load required to start sliding was measured.

Table 2 shows the measurement results.

[Table 2] The evaluation by ◯, △, × in the field of actual use is as follows. ○: The head moves smoothly and no extra force is applied. Δ: The head sometimes gets caught on the floor surface, and it takes a little force to move. ×: The head is caught on the floor surface and has a force to move. Also, the head may be reversed.

[0032]

As described above in detail, according to the present invention, not only the dust removing performance in dry wiping but also effective use in wiping water or spilled water, and good productivity, It is possible to obtain a cleaning sheet that is extremely suitable as a disposable sheet for mops.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of a crimped state of crimpable synthetic fibers that can be used in the cleaning sheet of the present invention.

FIG. 2 is an explanatory view showing another example of a crimped state of the crimpable synthetic fiber.

FIG. 3 is an explanatory diagram showing still another example of a crimped state of the crimpable synthetic fiber.

FIG. 4 is a schematic cross-sectional view of a cleaning sheet according to the present invention.

[Explanation of symbols]

 1 web 2 hydrophilic fiber 3 fiber web 4 synthetic fiber

Claims (3)

[Claims] 1. A cleaning sheet comprising a web of hydrophilic fibers or a water absorbent sheet, on one or both sides of which a fiber web of synthetic fibers is laminated, and both layers are integrated in an entangled state. 2. The cleaning according to claim 1, wherein a web or absorbent sheet made of hydrophilic fibers and a fiber web made of synthetic fibers are integrated by a spunlace method or a needle punch method. Sheet. 3. The sheet is characterized in that the mixing ratio of hydrophilic fibers has a small gradient on the sheet surface side in the thickness direction of the sheet, and the ratio of hydrophilic fibers existing on the sheet surface is 60% or less. The cleaning sheet according to claim 1 or 2.